Sound absorbing ostomy pouch

ES 2 806 002 T3

DESCRIPTION

Sound Absorbing Ostomy Bag

BACKGROUND

The present description relates to ostomy devices and, more particularly, to an ostomy pouch manufactured using a sound absorbing laminate that includes a sound absorbing adhesive.

Patients who have undergone surgery, such as a colostomy, ileostomy, or urostomy, use ostomy devices to collect body waste, such as ostomy bags. When a stoma releases body waste, flatus gas is often released along with the waste. Flatus gas that passes through the stoma can cause a transient vibration in the body tissue, which the patient cannot control. This release of flatus gas from the stoma can be accompanied by an intrusive noise, which can cause embarrassment to the patient.

Ostomy bags have been developed that comprise a quiet film to reduce noise produced by ostomy bags, for example, the plastic squeak produced by the ostomy bag when a user moves. Examples of such a silent film include the multilayer films described in Giori, US 7,270,860, which is assigned to the assignee of the present application. However, these quiet films could be improved to better isolate flatus noise and prevent embarrassment.

Chang et al., PCT Application No. PCT / US12 / 71953 (published as WO 2013/102009), which is assigned to the assignee of the present application, describes sound absorbing films, sound absorbing nonwovens, laminates of the themselves and ostomy bags made using such sound absorbing materials. Other examples are found in international publications WO 2011/056861 and WO 2011/062829.

Because of the serious inherent medical, social, and personal concerns related to the need to wear an ostomy appliance, improvements in ostomy appliances are desired. Any appreciable improvement in such ostomy devices to provide greater discretion and privacy is of great importance in the quality of life of the growing number of ostomy patients. The present disclosure provides improved ostomy devices according to various embodiments to improve the sound insulation properties of said ostomy devices.

SHORT SUMMARY

A sound absorbing adhesive formulated with a vinyl bond rich triblock copolymer and an ostomy appliance including the same is provided according to various embodiments of the present disclosure. The sound absorbing adhesive can be used to laminate a non-woven layer to a wall of the bag to isolate the noise from flatus gases.

In one aspect, a sound absorbent ostomy bag is provided. The sound absorbing ostomy bag includes a first wall, a second wall, and a first nonwoven layer adhesively attached to the first wall by a sound absorbing adhesive therebetween. A second non-woven layer can also be adhesively attached to the second wall. The first wall and the second wall are sealed along their peripheral edges to define a cavity for collecting bodily waste. The sound absorbing adhesive includes a vinyl bond rich triblock copolymer. Preferably, the vinyl-rich triblock copolymer is a vinyl-rich, non-hydrogenated styrene-isoprene-styrene block copolymer or a vinyl-rich hydrogenated styrene-isoprene-styrene block copolymer.

The sound absorbing adhesive can be formulated to include from about 2 percent by weight (% by weight) to about 50% by weight of a non-hydrogenated styrene-isoprene-styrene block copolymer rich in vinyl or vinyl bonds. a hydrogenated styrene-isoprene-styrene block copolymer rich in vinyl bonds. Preferably, the sound absorbing adhesive includes from about 5% by weight to about 40% by weight of the non-hydrogenated vinyl-rich styrene-isoprene-styrene block copolymer or the styrene-isoprene-styrene block copolymer. hydrogenated rich in vinyl bonds. In addition, the sound absorbing adhesive may include a tackifier and an end block modifying resin. Preferably, the sound absorbing adhesive has a tangent delta value of greater than about 1.0 at 25 ° C between frequencies of 150 Hz and 2000 Hz.

In one embodiment, the sound absorbing adhesive is formulated with about 60% by weight to about 80% by weight of at least one tackifier, about 0 to about 15% by weight of a modifying resin. end blocks, about 5%

ES 2 806 002 T3 by weight to about 40% by weight of a non-hydrogenated styrene-isoprene-styrene block copolymer rich in vinyl bonds and about 0 to about 2% by weight of an antioxidant.

In another embodiment, the sound absorbing adhesive is formulated with about 60% by weight to about 80% by weight of at least one tackifier, about 5% by weight to about 40% by weight of a hydrogenated styrene-isoprene-styrene block copolymer rich in vinyl bonds and about 0 to about 2% by weight of an antioxidant.

In some embodiments, the sound absorbing ostomy bag further includes a second nonwoven layer adhesively attached to the second wall by the sound absorbing adhesive between them. Preferably, at least one of the first and second nonwoven layers is formed of a sound absorbing nonwoven material that includes fibers comprising a vinyl bond rich triblock copolymer. In addition, at least one of the first wall and the second wall may be formed of a sound absorbing film that includes a vinyl bond rich triblock copolymer.

In a preferred embodiment, the first wall is formed from a multilayer film that is about 25.4 µm to about 76.2 µm (1 mil to about 3 mil) thick. The first nonwoven layer is formed from a sound absorbing nonwoven fabric that includes a vinyl bond rich triblock copolymer, and has a basis weight of approximately 40 g / m2 and a thickness of approximately 203 μm (approximately 8 one thousand). Sound absorbing adhesive having a thickness of about 25.4 µm to about 76.2 µm (about 1 mil to about 3 mil) is disposed between the first wall and the first non-woven layer.

In some embodiments of the sound absorbent ostomy bag that includes a second non-woven layer, the second wall can be formed from a multilayer film that has a thickness of about 25.4 µm to about 76.2 µm (from about 1 thousand to about 3 thousand), and the second non-woven layer can be formed from a sound-absorbing non-woven fabric that includes a vinyl bond-rich triblock copolymer and has a basis weight of about 40 g / m2 and a thickness of about 203.2 µm. (approximately 8 thousand). The sound absorbing adhesive having a thickness of about 25.4 µm to about 76.2 µm (about 1 mil to about 3 mil) is disposed between the second wall and the second non-woven layer.

Furthermore, the multilayer film can be a five-layer film that includes a sealing layer, an inner layer, a tie layer, a barrier layer, and a contact adhesive layer.

In another aspect, a sound absorbing adhesive is provided that includes a vinyl bond rich triblock copolymer and a tackifier.

The sound absorbing adhesive can be formulated with from about 2% by weight to about 50% by weight of vinyl bond rich triblock copolymer. Preferably, the sound absorbing adhesive is formulated with about 5% by weight to about 40% by weight of a non-hydrogenated styrene-isoprene-styrene block copolymer rich in vinyl bonds or of a styreneisoprene block copolymer. -Hydrogenated styrene rich in vinyl bonds.

In one embodiment, the sound absorbing adhesive is formulated with about 14% by weight of a cycloaliphatic hydrocarbon tackifier, about 61% by weight of a hydrocarbon tackifier, about 14% of a modifying resin. alphamethyl styrene end block, from about 5% by weight to about 40% by weight of a vinyl-rich non-hydrogenated styrene-isoprene-styrene block copolymer and about 1% by weight of a phenolic antioxidant.

In another embodiment, the sound absorbing adhesive is formulated with about 5% by weight to about 20% by weight of a cycloaliphatic hydrocarbon tackifier, about 50% by weight to about 70% by weight of a hydrocarbon tackifier, about 5% to 40% by weight of a vinyl bond rich hydrogenated styrene-isoprene-styrene block copolymer and about 0 to about 2% by weight of a primary phenolic antioxidant.

Preferably, the sound absorbing adhesive has a tangent delta of greater than about 1.0 at 25 ° C between frequencies of 150 Hz and 2000 Hz, a viscosity of less than about 8000 cP at 165 ° C, and a G 'of less than about 120,000. Pa at 25 ° C.

ES 2 806 002 T3

Other aspects, objects, and advantages will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The benefits and advantages of the present embodiments will become more readily apparent to those skilled in the relevant art after reviewing the following detailed description and accompanying drawings, where:

Figure 1 is a cross-sectional illustration of an ostomy device including a pouch and a sealing barrier in accordance with one embodiment of the present disclosure;

Figure 2 is a cross-sectional illustration of a multilayer film according to one embodiment; and Figure 3 is a graph showing the tangent delta data for a sound absorbing adhesive sample and a control adhesive sample.

DETAILED DESCRIPTION

Although the present disclosure is capable of being embodied in various forms, it is shown in the drawings and a presently preferred embodiment of the invention will be described hereinafter with the understanding that the present disclosure is to be considered an exemplification and is not intended to limit the description to the specific embodiment illustrated.

Figure 1 is a cross-sectional illustration of a one-piece ostomy bag 10 according to one embodiment. The ostomy device generally includes a bag 12 and a sealing barrier 14. The bag 12 includes opposing first and second walls 16, 18 that are sealed around the peripheral edges 20 thereof by heat sealing or otherwise. suitable means for defining a cavity 22 therebetween. Bag 12 also includes a first nonwoven layer 24 adhesively attached to first wall 16 by a first adhesive 28 therebetween, and a second nonwoven layer 26 adhesively attached to second wall 18 by second adhesive 30 between them. Each of the first and second adhesive layers 28, 30 is formed of a sound absorbing adhesive that includes a vinyl bond rich triblock copolymer.

The first and second walls 16, 18 are formed from a suitable polymeric film, and each of the walls can be formed from the same or different films. The films can be a single layer film or a multilayer film, such as a multilayer film that includes an odor barrier layer used in commercially available ostomy bags.

Preferably, each of the first and second walls 16, 18 is formed of a relatively thin multilayer film to allow a thicker layer of the sound absorbing adhesive 28, 30. In one embodiment, the total thickness of a body side laminate that includes the first wall 16, the first sound absorbing adhesive 28, and the first nonwoven layer 24 is from about 2.64mm to about 3.15mm (from 10.4 mil to about 12.4 mil), wherein the first wall 16 is formed of a multilayer film having a thickness of about 25.4 µm to about 50.8 µm (about 1 mil to about 2 mil ), The first sound absorbing adhesive is about 35.6 µm to about 60.96 µm (about 1.4 mil to about 2.4 mil) thick and the first nonwoven layer is about 203 µm thick (about 8 thousand). Similarly, the total thickness of a laminate that includes the second wall 18, the second sound absorbing adhesive 30, and the second nonwoven layer 26 is from about 264 μm to about 315 μm (from 10.4 mil to about 12, 4 mil), wherein the first wall 18 is formed of a multilayer film having a thickness of from about 25.4 µm to about 50.8 µm (from about 1 mil to about 2 mil), the second sound absorbing adhesive is approximately 35.6 μm to approximately 60.96 μm (approximately 1.4 mil to approximately 2.4 mil) thick and the second non-woven layer is approximately 203 μm (approximately 8 thousand).

In this embodiment, each of the first and second walls 16, 18 is formed of a five-layer film that has odor barrier properties and a thickness of from about 25 µm to about 50 µm (from about 1 mil to about 2000). Figure 2 shows a cross-sectional view of an embodiment of a five-layer film suitable for the first and second walls 16, 18. The five-layer film 40 includes a seal layer 42, an inner layer 44, a tie layer 46, a barrier layer 48, and a contact adhesive layer 50, and has a seal layer / inner layer / bonding layer / barrier layer / contact adhesive layer. Preferably, the film 40 is relatively thin, for example, it has

ES 2 806 002 T3 a thickness of about 40 µm, wherein the sealing layer 42 has a thickness of about 20 µm, the inner layer 44 has a thickness of about 8 µm, the tie layer 46 has a thickness of about 4 µm, barrier layer 48 is approximately 4 µm thick, and pressure sensitive adhesive layer 50 is approximately 4 µm thick.

The sealing layer 42 may be formed of a material having a suitable heat sealing ability, so that the sealing layers can be heat sealed to form a bag. Suitable materials for seal layer 42 include, for example, copolymers of ethylene with vinyl esters, such as copolymer of vinyl acetate (EVA) and copolymers of ethylene and methyl acrylate (EMA). EVA copolymers contain from about 10 percent by weight (% by weight) to 35% by weight of vinyl acetate, and more preferably, about 18 percent of vinyl acetate, by weight of the copolymer. An exemplary material is available from ExxonMobil as Escorene® Ultra FL00218. Said material has a melting point temperature of 86 ° C and a Shore A hardness of approximately 91. EVAs are known to exhibit the characteristics necessary to bond with another EVA member, such as by heat sealing, to provide a liquid and air tight seal at the gasket or seal. EVA materials can be mixed to facilitate film formation and extrusion. For example, an EVA blend may have about 98% by weight eVa with about 2% by weight anti-blocking and slip additives, in an EVA vehicle. A suitable additive is available from A. Schulman Inc., as Polybatch® SAB-1982VA.

EMA copolymers include from about 10% by weight to about 35% by weight of methyl acrylate, and preferably from about 18.5% by weight to about 30% by weight of methyl acrylate, of the copolymer. . Such EMA copolymers typically have melting point temperatures of about 85 ° C to 87 ° C and a Shore A hardness of about 73 and a Shore D hardness of about 20 to 25. Suitable materials are available from Arkema Inc. as Lotryl®18AM02 and from DuPont as Elvaloy®1330AC. EMA resins can also be mixed with slip and anti-block additives in an EVA vehicle. A suitable material for the mix is ​​the Polybatch® SAB-1982VA mentioned above. Such a blend may have, for example, about 98% by weight of EMA, with about 2% by weight of the Polybatch® SAB-1982VA antiblocking and slip additive.

Other suitable materials for the seal layer include polymer blends comprising EVA and EMA. Examples include, but are not limited to, a blend of EVA copolymer (Escorene®FL00218 present at 49% by weight) and ethylene-propylene copolymer (PP elastomer, Versify®2200 present at 49% by weight ) with antiblocking and slip additives, and a mixture of EMA (Elvaloy®1330AC present in 49% by weight) and PP elastomer (Versify®2200 present in 49% by weight) also with antiblocking and slip additives. PP elastomers such as Versify® from Dow, Vistamaxx® from Exxon and Notio® from Mitsui are also suitable.

In addition to heat sealability, seal layers 42 can also provide sound absorbing properties to film 40. In one such embodiment, seal layer 42 comprises a vinyl bond-rich triblock copolymer, such as Hybrar® from Kuraray Co. Ltd. to improve the mechanical properties and sound absorbing properties of film 40. For example, seal layer 42 can be formed from a blend of a non-hydrogenated styrene isopropene triblock copolymer (Hybrar® 5127), a PP elastomer (Vistamaxx®), and an EMA (Lotryl® 20MA08).

Inner layer 44 is disposed adjacent to seal layer 42 and can impart mechanical (tear) strength to film 40. Ethylene-based polymers, such as ethylene vinyl acetate copolymer (EVA), plastomers Ethylene-octene (EO) and ethylene-propylene (EP) copolymers (PP elastomer) are suitable film-forming materials for the inner layer. A suitable material is an EVA copolymer having a vinyl acetate content of from about 8% by weight to 30% by weight, and preferably from about 10% by weight to about 25% by weight, a temperature with a melting point of about 86 ° C and a Shore A hardness of about 91, such as Escorene®FL00218.

Another suitable material is an ethylene-octene (EO) plastomer having a melting point temperature of about 95 ° C and a specific gravity of about 0.902, such as Exact® 0203 resin available from ExxonMobil Corporation, which has a weight specific of about 0.88 and a Shore A hardness of about 95. This resin is designed for both monolayer and multilayer co-extruded cast film applications and is suitable in applications requiring heat seal performance and toughness. Typical applications include industrial packaging films.

Still another suitable resin is an ethylene-propylene copolymer resin (PP elastomer) which exhibits a low melt index, making it suitable for film application and heat sealing. It has a low modulus and thus exhibits low noise characteristics. It has excellent compatibility with polypropylene (PP) and polyethylene (PE). One of these materials is available from Dow Chemical as Versify^®2200. This resin has a

ES 2 806 002 T3 has a melting point of about 82 ° C, a Shore A hardness of 94 and a Shore D hardness of 42. It has a specific gravity of 0.878. Blends of various PP copolymer resins have been found to be suitable as well, for example blends of Versify®2200 and Versify®3400, which is a similar PP copolymer resin, but has a melting point greater than about 97 ° C, a Shore A hardness of 72 and a Shore D hardness of 22 and a specific gravity of about 0.865. Suitable blends may have ratios from about 50% by weight Versify®2200 to about 75% by weight Versify®2200 of the blend. PP elastomers such as Versify® from Dow, Vistamaxx® from Exxon and Notio® from Mitsui are also suitable.

In some embodiments, the inner layer 44 can also provide sound absorbing properties. In one such embodiment, the inner layer 44 comprises a vinyl bond rich triblock copolymer, such as Hybrar®, to improve the sound absorbing properties and mechanical properties of the film 40. For example, inner layer 44 can be formed from a blend of a styrene-isoprenestyrene block copolymer rich in hydrogenated vinyl bonds (eg, Hybrar® 7125) and a PP elastomer (Vistamaxx®).

Tie layer 46 is disposed between inner layer 44 and barrier layer 48. Tie layer 46 facilitates adhesion of barrier layer 48 to the remainder of the film structure. Suitable materials for tie layer 46 include maleate polyolefins, such as ethylene maleate methyl acrylate (EMA) copolymers having maleic anhydride present at about 0.3% by weight and methyl acrylate present at about one percent. 20% by weight of the resin. One of these materials is available from Arkema, Inc. as Lotader®4503. In one embodiment, tie layer 46 is formed from a mixture comprising 80% by weight of EMA (Lotryl®18MA02 from Arkema, Inc.) and 20% by weight of maleate compound (Bynel®CXA41E710 from Dupont).

Barrier layer 48 may be formed of a suitable film having gas barrier properties. Preferably, barrier layer 48 is formed from a non-chlorine-containing polymer that is substantially impervious to malodour-inducing compounds typically found in ostomy bags. Such malodor-inducing compounds may include compounds containing sulfur and indoles. Suitable barrier layer materials include resins such as amorphous polyamide (nylon) resin and an anhydride modified olefinic polymer or copolymer, or an epoxy modified olefinic polymer or copolymer. In one embodiment, barrier layer 48 may be formed from a blend of an amorphous polyamide, such as Selar® PA3426R from DuPont Company, and a functionalized rubber blend or compound, such as Lotader® 4720.

The contact adhesive layer 50 is disposed adjacent to the barrier layer, and facilitates adhesion of the film 40 to the sound absorbing adhesive layers 28, 30. Suitable tie layer materials are also suitable for the barrier layer. contact adhesive 50. For example, ethylene maleate methyl acrylate (EMA) copolymers having maleic anhydride present in approximately 0.3% by weight and methyl acrylate present in approximately 20% by weight of the resin (Lotader®4503) They can be used to form the contact adhesive layer 50.

Other multilayer films with odor barrier properties that have more than five layers or less than five layers can also be used to form one or both of the first and second walls 16, 18. For example, a film of seven layers having a structure ABCDCBa, where A represents sealing layers, B represents inner layers, C represents tie layers and D represents a barrier layer, to form the first wall 16 and / or the second wall 18. A six-layer film that includes a barrier layer, two tie layers, an inner layer, and two sealing layers (eg ABCdcA) can also be used to form the first wall and / or the second wall 18. The walls 16, 18 can be formed by the same multilayer film or by different multilayer films. In a preferred embodiment, the multilayer films for the first and second walls 16, 18 include at least one layer comprising a vinyl bond-rich triblock copolymer, such as a non-hydrogenated styrene-isoprene-styrene block copolymer rich in vinyl bonds, eg Hybrar® 5125 and 5127, or a styrene-isoprene-hydrogenated styrene block copolymer rich in vinyl bonds, eg Hybrar® 7125.

Referring again to Figure 1, the first and second walls 16, 18 are provided with the first and second non-woven layers 24, 26, respectively, which are attached through the first and second adhesive layers 28 , 30, respectively. In this embodiment, each of the first and second adhesive layers 28, 30 is formed of a sound absorbing adhesive that includes a vinyl bond rich triblock copolymer. Suitable sound absorbing adhesives have high sound absorbing properties, good process recoatability, and softness. In preferred embodiments, the sound absorbing adhesive formulation includes from about 2% by weight to about 50% by weight of vinyl bond rich triblock copolymer, from about 45% by weight to about 85% by weight of tackifier, about 0% by weight to about 30% by weight end block modifier resin, from about 0% by weight to about 30% by weight of diluent and about

ES 2 806 002 T3 from 0% by weight to approximately 3% by weight antioxidant, and has a tangent delta at 25 ° C greater than approximately 1 between frequencies of 150 Hz and 2000 Hz, a viscosity less than approximately 8000 cP at 165 ° C and a G 'less than about 120,000 Pa at 25 ° C.

Suitable vinyl-rich triblock copolymers include non-hydrogenated vinyl-rich styrene-isoprene-styrene block copolymers, such as Hybrar® 5125 and 5127, and hydrogenated vinyl-rich styrene-isoprene-styrene block copolymers, such as Hybrar® 7125 and 7311. Suitable elastomers include diblock copolymers, such as a diblock copolymer based on styrene and ethylene / propylene with a polystyrene content of approximately 28% by weight (for example, Kraton®G1702 from Kraton Polymers), polyisobutylene, polyisoprene and styrene copolymers /butadiene. Suitable adhesives include cycloaliphatic hydrocarbons (eg Escorez® from Exxon Chemical) and hydrocarbon resins (eg Regalite® from Eastman Chemical Company, Wingtack® from Goodyear Chemical). Suitable end-block modifier resins include aromatic resins based on mixed C9 petroleum distillation streams, resins based on pure or mixed monomeric streams of aromatic monomers such as homo- or copolymers of vinyl toluene, styrene, alpha-methyl styrene (for example, Kristalex® from Eastman Chemical Company), coumarone and indene. Suitable diluents include polyisoprene and polybutenes (eg, Indopol® from bP). Suitable antioxidants include typical antioxidants used in rubber-based pressure sensitive adhesives, such as high molecular weight hindered phenols and multifunctional phenols such as sulfur and phosphorous containing phenols.

In some embodiments, the sound absorbing adhesive is formulated including about 5% by weight to 40% by weight of a vinyl bond rich non-hydrogenated styrene-isoprene-styrene block copolymer, such as Hybrar® 5125 and 5127, about 7% by weight to 23% by weight of a cycloaliphatic hydrocarbon resin, such as Escorez® 5400, about 57% by weight to 73% by weight of liquid tackifying hydrocarbon resin, such as Wingtack® 10, and about 11% by weight to about 16% by weight of an end block modifier resin, such as Kristalex^® 3085.

The sound absorbing adhesive can also be formulated including a styreneisoprene-hydrogenated styrene block copolymer rich in vinyl bonds. For example, a sound absorbing adhesive can be formulated by including about 5% by weight to 40% by weight of a hydrogenated styrene-isoprene styrene block copolymer rich in vinyl bonds, such as Hybrar® 7125 and 7311, about 5% by weight to 20% by weight of a cycloaliphatic hydrocarbon resin, such as Escorez^® 5400, about 50% by weight to 70% by weight of liquid tackifying hydrocarbon resin, such as Wingtack^® 10 and about 0% by weight to 2% by weight of an antioxidant, such as Irganox®1010 from Ciba Specialty Chemicals, Inc.

Each of the walls 16, 18 can be adhesively laminated to the nonwoven layer 24, 26 using the sound absorbing adhesive layer 28, 30 therebetween. The nonwoven layers 24, 26 can be formed of any suitable nonwoven material, such as a nonwoven fabric having a basis weight of about 40 grams per square meter (g / m2) of polyethylene fibers. Preferably, at least one of the non-woven layers 24, 26 is formed of a sound-absorbing non-woven material. The sound- absorbing nonwoven can be formed from fibers comprising a vinyl-rich triblock copolymer, such as a vinyl-rich non-hydrogenated styrene-isoprene-styrene block copolymer, for example, Hybrar^® 5125 and 5127, or a styrene-isoprene-hydrogenated styrene block copolymer rich in vinyl bonds, e.g. Hybrar^®7125.

In one embodiment, the fibers are formed from a blend of a vinyl bond-rich triblock copolymer and polyethylene (PE) or polypropylene (PP). In another embodiment, the fibers are formed from a blend of a vinyl-rich hydrogenated styrene-isoprene-styrene block copolymer, such as Hybrar® 7125, and at least one other polymer. For example, the fibers are formed from a mixture of Hybrar® 7125 and a hydrogenated polymer (styrene-isoprenestyrene) (SEPS), such as Septon®, which is available from Kuraray Co. Ltd. SEPS Septon® is distinguished from Hybrar® 7125 in which the middle block of the SEPS Septon® is a hydrogenated polyisoprene, while the middle block of Hybrar® 7125 is hydrogenated vinyl polyisoprene. Surprisingly, test results indicate that vinyl-bond-rich Hybrar® 7125 provides significantly better sound absorbing properties than SEPS Septon^®. In another example, the fibers are formed from a mixture of a hydrogenated styrene-isoprene-styrene block copolymer (SEPS) rich in low molecular weight vinyl bonds, such as HG664 from Kuraray Co. Ltd., a copolymer block SEPS Septon® and a low molecular weight PP.

In some embodiments, the fibers have a sheath and core structure, where the core is made of Hybrar® and the sheath is made of PE or PP. In such an embodiment, the sticky Hybrar® core is surrounded by the sheath, which is advantageous during the manufacture of nonwovens from the fibers. The

ES 2 806 002 T3 sound absorbing nonwoven material can be formed by carding and dry layering such fibers. Alternatively, the nonwoven can be formed by extrusion blown or spinning technologies.

Although the embodiment of the ostomy bag of Figure 1 is provided with a non-woven layer on both the body side and the outer side of the bag, in other embodiments, an ostomy bag may be provided with a non-woven layer in a single side. For example, the side wall of the body (i.e. first wall 16) can be laminated into a non-woven layer using a sound absorbing adhesive, while the outer wall (i.e. second wall 18) is free of a non-woven layer or sound absorbing adhesive layer. Alternatively, the outer wall can be laminated into a non-woven layer by means of a sound absorbing adhesive, while the side wall of the body is free from a non-woven layer or a sound absorbing layer.

Although the embodiment shown in Figure 1 is a one-piece ostomy device with a closed-end pouch, the multilayer films, sound-absorbing adhesives, and sound-absorbing nonwovens discussed above can be used to make other types of devices. ostomies, such as two-piece ostomy appliances and drainable ostomy bags.

Examples and test results

Six different sample adhesive compositions were prepared comprising a non-hydrogenated styrene-isoprene-styrene block copolymer rich in vinyl bonds. A control sample was prepared using a pressure sensitive hot melt adhesive available under the trade name Dermatak® from Henkel. Dermatak® adhesive comprises high molecular weight triblock and diblock copolymers, a paraffinic white oil, an end block modifying resin, and a cycloaliphatic resin (tackifier), and is typically used in skin contact applications, including transdermal drug delivery applications. A dynamic mechanical analysis (DMA) was carried out for the samples at an oscillation frequency of 10 rad / s, during which the dynamic modulus including the storage modulus (G '), the loss modulus (G ) and the complex module (G *). Dynamic modulus values ​​correlate with the viscosity and stiffness of an adhesive. For example, the higher the value of G ', the higher the viscosity and stiffness of an adhesive. Furthermore, the tangent delta (Tan Δ) values, which correlate with the sound absorbing properties of an adhesive, were also measured. For example, a higher Tan Δ value correlates with a higher sound absorbing property.

The AL-43-73-2 adhesive sample was formulated with 15 parts by weight (PBW) (approximately 14.2% by weight) of Escorez®5400 (a cycloaliphatic hydrocarbon tackifier), 65 PBW (approximately one 61.3% by weight) of Wingtack®10 (a hydrocarbon tackifier), 15 PBW (approximately 14.2% by weight) of Kristalex®3085 (an alpha-methyl styrene end block modifier resin ), 10 PBW (approximately 9.4% by weight) of Hybrar®5125 (a non-hydrogenated styrene-isoprene-styrene block copolymer rich in vinyl bonds) and 1 PBW (approximately 0.9% by weight) of Irganox® 1010 (a primary phenolic antioxidant).

The AL-43-73-3 adhesive sample was formulated with 15 PBW (approximately 14.2% by weight) of Escorez®5400, 65 PBW (approximately 61.3% by weight) of Wingtack®10, 15 PBW (approximately 14.2% by weight) of Kristalex®3085, 10 PBW (approximately 9.4% by weight) of Hybrar®5127 (a non-hydrogenated styrene-isoprene-styrene block copolymer rich in vinyl bonds) and 1 PBW (approximately 0.9% by weight) from Irganox^®1010.

The AL-43-73-4 adhesive sample was formulated with 15 PBW (approximately 12.4% by weight) of Escorez®5400, 65 PBW (approximately 53.7% by weight) of Wingtack®10, 15 PBW (approximately 12.4% by weight) of Kristalex®3085, 25 PBW (approximately 2 °, 7% by weight) of Hybrar®5125 and 1 PBW (approximately 0.8% by weight) of Irganox®1010.

The AL-43-73-9 adhesive sample was formulated with 15 PBW (approximately 14.2% by weight) of Escorez®5400, 65 PBW (approximately 61.3% by weight) of Wingtack®10, 15 PBW (approximately 14.2% by weight) of Kristalex®3085, 10 PBW (approximately 9.4% by weight) of Hybrar®5125 and 1 PBW (approximately 0.9% by weight) of Irganox®1010.

The AL-43-73-10 adhesive sample was formulated with 23 PBW (approximately 21.7% by weight) of Escorez®5400, 57 PBW (approximately 53.8% by weight) of Wingtack®10, 15 PBW (approximately 14.2% by weight) of Kristalex®3085, 10 PBW (approximately 9.4% by weight) of Hybrar®5125 and 1 PBW (approximately 0.9% by weight) of Irganox®1010.

The AL-43-73-11 adhesive sample was formulated with 23 PBW (approximately 21.7% by weight) of Escorez®5400, 57 PBW (approximately 53.8% by weight) of Wingtack®10, 15 PBW (approximately 14.2%) of

ES 2 806 002 T3

Kristalex®3085, 10 PBW (about 9.4% by weight) from Hybrar®5125 and 1 PBW (about 0.9% by weight) from lrganox®1010. Sample adhesive formulations are summarized in Table 1.

TABLE 1: Sample Adhesive Formulations

<td>Ingredients</td><td>AL-43-732 (% by weight)</td><td>AL-43-733 (% by weight)</td><td>AL-43-734 (% by weight)</td><td>AL-43-739 (% by weight)</td><td>AL-43-7310 (% by weight)</td><td>AL-43-7311 (% by weight)</td>

<td>Escorez®5400</td><td> 14,2</td><td> 14,2</td><td> 12,4</td><td> 14,2</td><td> 21,7</td><td> 21,7</td>

<td>Wingtack®10</td><td> 61,3</td><td> 61,3</td><td> 53,7</td><td> 61,3</td><td> 53,8</td><td> 53,8</td>

<td>Kristalex®3085</td><td> 14,2</td><td> 14,2</td><td> 12,4</td><td> 14,2</td><td> 14,2</td><td> 14,2</td>

<td>Hybrar®5125</td><td> 9,4</td><td> -</td><td> 20,7</td><td> 9,4</td><td> 9,4</td><td> 9,4</td>

<td>Hybrar®5127</td><td> -</td><td> 9,4</td><td> -</td><td> -</td><td> -</td><td> -</td>

<td>lrganox®1010</td><td> 0,9</td><td> 0,9</td><td> 0,8</td><td> 0,9</td><td> 0,9</td><td> 0,9</td>

The values ​​of the dynamic modulus and the values ​​of the tangent delta are summarized in table 2.

TABLE 2: values ​​of dynamic modulus and tangent delta

<td></td><td colspan="6">Dynamic mechanical analysis at 10 rad / s</td>

<td></td><td>G 'at 25 ° C (Pa)</td><td>G at 25 ° C (Pa)</td><td>G * at 25 ° C (Pa)</td><td>Tan Δ at 25 ° C</td><td>Temp. (TanA maximum) (° C)</td><td>Tan Δ maximum</td>

<td>Control</td><td> 15.942</td><td> 5.935</td><td> 17.013</td><td> 0,4</td><td> -10,5</td><td> 4,2</td>

<td>AL-43-73-2</td><td> 43.160</td><td> 321.000</td><td> 323.900</td><td> 7,4</td><td> 20,4</td><td> 8,5</td>

<td>AL-43-73-3</td><td> 56.020</td><td> 306.700</td><td> 311.800</td><td> 5,5</td><td> 18,5</td><td> 7,4</td>

<td>AL-43-73-4</td><td> 47.170</td><td> 74.580</td><td> 88.250</td><td> 1,6</td><td> 9,0</td><td> 5,3</td>

<td>AL-43-73-9</td><td> 29.890</td><td> 156.123</td><td> 158.943</td><td> 5,2</td><td> 17,9</td><td> 8,6</td>

<td>AL-43-73-10</td><td> 40.919</td><td> 248.576</td><td> 248.307</td><td> 6,1</td><td> 18,0</td><td> 8,2</td>

<td>AL-43-73-11</td><td> 55.430</td><td> 320.145</td><td> 336.835</td><td> 5,7</td><td> 20,4</td><td> 7,2</td>

As can be seen from Table 2, sample adhesive formulations that include a vinyl bond-rich non-hydrogenated styrene-isoprene-styrene block copolymer (i.e., Hybrar® 5125 or Hybrar® 5127) had values ​​of the tangent delta substantially greater than the control adhesive sample, which was prepared from an adhesive used in some known ostomy pouches to laminate a non-woven fabric to a pouch wall. Higher tangent values ​​indicate that adhesive formulations that include non-hydrogenated styrene-isoprene-styrene block copolymer rich in vinyl bonds can provide significantly improved sound absorbing properties for an ostomy bag, compared to the same. ostomy bag manufactured using the control adhesive. Furthermore, although the sample adhesive formulations had higher dynamic modulus values ​​than the control adhesive sample, evaluations of the physical characteristics of the sample adhesive formulations indicate that these adhesive formulations have sufficient viscosity and stiffness to laminate a non-woven fabric on a wall of the bag.

A sample adhesive composition comprising a vinyl bond-rich hydrogenated styrene-isoprene-styrene block copolymer and a control adhesive sample were prepared, which is a typical adhesive formulation for bonding a non-woven fabric to a film layer. , such as those used in disposable diaper applications. A dynamic mechanical analysis (DMA) was carried out for the samples at an oscillation frequency of 10 rad / s, during which the dynamic modulus was measured including the values ​​of the storage modulus (G '),

ES 2 806 002 T3 the loss modulus (G), the complex modulus (G *) and the tangent delta (Tan Δ). In addition, Tan Δ values ​​were also measured between frequencies of approximately 150 Hz and 2000 Hz, which are an important indication of sound absorbing properties in ostomy applications.

Adhesive sample 42-40-3 was formulated with approximately 9.9% by weight Escorez®5400 (a cycloaliphatic hydrocarbon tackifier), approximately 59.4% by weight Wingtack®10 (a tackifier). hydrocarbon tack), about 29.7% by weight of Hybrar®7311 (a hydrogenated styrene-isoprene-styrene block copolymer rich in vinyl bonds) and about 1% by weight of lrganox®1010 (a phenolic antioxidant primary).

The control adhesive sample was formulated with approximately 59.5% by weight of Eastman's Eastotac®H100W (a hydrogenated hydrocarbon resin based tackifier), approximately 20% by weight of Calumet's Calsol®5550 (a naphthenic processing oil), about 20% by weight of Kraton®1165 from Kraton (a block copolymer of SIS) and about 1% by weight of lrganox®1010. The sample adhesive formulation and the control adhesive formulation are summarized in Table 3.

TABLE 3: Sample Adhesive Formulations

<td>Ingredients</td><td>42-40-3 (% by weight)</td><td>Control (% by weight)</td>

<td>Escorez®5400</td><td> 9,9</td><td></td>

<td>Eastotac®H100W</td><td></td><td> 59,5</td>

<td>Calsol®5550</td><td></td><td> 20</td>

<td>Wingtack®10</td><td> 59,4</td><td></td>

<td>Kraton®1165</td><td></td><td> 20</td>

<td>Hybrar®7311</td><td> 29,7</td><td></td>

<td>lrganox®1010</td><td> 1</td><td> 0,5</td>

Data from dynamic mechanical analysis (DMA) at a frequency of 10 rad / s are summarized in Table 4.

TABLE 4: dynamic mechanical analysis data

<td></td><td>G 'at 25 ° C (Pa)</td><td>G at 25 ° C (Pa)</td><td>G * at 25 ° C (Pa)</td><td>Tan Δ at 25 ° C</td><td>Tan Δ maximum</td>

<td>Control</td><td> 1 276 061</td><td> 2 934 472</td><td> 3 200 417</td><td> 2,3</td><td> 3,4</td>

<td> 42-40-3</td><td> 109 600</td><td> 71 043</td><td> 130 613</td><td> 0,7</td><td> 3,6</td>

Figure 3 is a graph showing values ​​of tan Δ between approximately 150 Hz and 2000 Hz. As can be seen in Figure 3, the sample adhesive 42-40-3 that includes a styrene-isoprene-styrene block copolymer Hydrogenated rich in vinyl bonds (ie, Hybrar® 7311) had substantially higher tangent delta values ​​between frequencies of 150 Hz and 2000 Hz than the control adhesive sample. These higher tangent values ​​indicate that the adhesive formulation that includes the vinyl bond-rich hydrogenated styrene-isoprene-styrene block copolymer can provide significantly improved sound absorbing properties for an ostomy bag, compared to the same bag. made using the control adhesive. In addition, the sample adhesive 42-40-3 had significantly lower dynamic modulus values ​​than the control adhesive sample, indicating that the sample adhesive 42-40-3 is a softer adhesive with a lower viscosity than the control adhesive. control adhesive, which is advantageous for ostomy applications.

In the present description, the words a or an are to be taken to include both the singular and the plural. On the contrary, any reference to plural elements will include, where appropriate, the singular. All concentrations indicated in this application as percentages are percentages by weight unless otherwise indicated.

ES 2 806 002 T3

From the foregoing, it will be appreciated that numerous modifications and variations can be made without departing from the scope of the novel concepts of the present invention. It should be understood that no limitation is intended or should be inferred with respect to the specific embodiments illustrated. The purpose of the description is to include the appended claims, all modifications that fall within the scope of the claims.