PL196254B1

Coloured soda-lime glass

Abstract

The invention concerns a soda-lime glass. Said colored glass contains at least 5 parts per million of Co by weight and 0.5 to 0.9 wt. % Fe2O3 oxide. The amount of ferrous iron by weight of Fe2+ atoms relative to the total weight of iron atoms present in the glass ranges between 25 and 45%. Said glass further comprises chromium and/or vanadium. The glass has a light transmission factor TLA4 ranging between 10 and 50% and an energy transmission wavelength less than 491 nm. Said glass is particularly suited for producing blue-tinted glazing for motor vehicles.

Term

Term ended

Expired 14 June 2021, 5.3 years ago.

19 claims: 1 independent, 18 dependent

1
Colored soda-lime glass, characterized in that it contains:1. Barwne szkło sodowo-wapniowe, znamienne tym, że zawiera: - żelazo w ilości, która wyrażona jako masa tlenku Fe2O3 względem całkowitej masy szkła, mieści się w zakresie 0,5 do 0,9% wagowego w przeliczeniu na całkowitą ilość żelaza;iron in an amount expressed as mass of Fe2O3 oxide relative to the total mass of glass is in the range of 0.5 to 0.9% by weight based on the total amount of iron;- iron (II) in an amount expressed as the mass of atoms of Fe2+ with respect to the total mass of iron atoms present in this glass - Fe proportion2+ (total Fe) ranges from 25 to 45% by weight;-żelazo(II) w ilości, która wyrażona jako masaatomów Fe2+ względem całkowitej masy atomów żelaza obecnych w tym szkle -proporcja Fe2+ /całkowite Fe -mieści się w zakresie 25 do 45% wagowych;-kobalt w ilości, która wyrażona jako masa Co względem całkowitej masy szkła, wynosi co najmniej 5 części na milion -ppm wagowych;an amount of cobalt, expressed as a Co mass relative to the total mass of the glass, is at least 5 parts per million-ppm by weight;-chrom i/lub wanad;przy czym szkło to posiada: -chromium and / or vanadium;the glass has: - light transmittance coefficient TLA4, measured under the illuminator A and calculated for a glass thickness of 4 mm, ranging from 20 to 60%;-współczynnik przepuszczalności światła TLA4, mierzony pod oświetlaczem A i wyliczony dla grubości szkła 4 mm, mieszczący się w zakresie 20 do 60%;-współczynnik przepuszczalności energii TE4, mierzony zgodniez rozkładem Moon'a i wyliczony dla grubości szkła 4 mm, mieszczący się w zakresie 10 do 50%;energy transmission coefficient TE4, measured according to the Moon distribution and calculated for a glass thickness of 4 mm, within the range of 10 to 50%;-dominującą długość fali lD przy przepuszczaniu mniejszą niż 491 nm;lD dominant wavelength when transmitting less than 491 nm;- czystość wzbudzenia przy przepuszczaniu wynoszącą co najmniej 13,2%. - excitation purity on transmission of at least 13.2%.

342 paragraphs in 4 sections, as filed

Description of the invention

The subject of the invention is colored soda-lime glass.

The soda-lime glass may be colorless or colored, for example green, gray or blue when passed through.

The expression "soda-lime glass in this specification is used in a broad sense and refers to any glass that contains the following components (expressed as a percentage by weight):

<td colspan="2">This type of glass is widely used in the field of glazing, for example applied</td>

in motor vehicles or in buildings. They are usually produced in the form of a ribbon by a flotation process. The web can be cut into sheets, which can then be bent or treated to improve their mechanical properties, for example, heat toughening.

GB 2,289,273 discloses dark gray soda-lime glass containing the main glass components and iron, selenium, cobalt and chromium as colorants. The amount of iron, cobalt and chromium used is similar to the amount indicated in the glass according to the invention, however, the glass disclosed in the above-mentioned publication has an excitation purity of less than 12%, and the TLA4 light transmittance value is at most 28.7%.

US5688727 discloses a blue-colored glass that selectively absorbs IR and UV radiation, containing iron, cobalt and chromium in proportions coinciding with the amount specified for the glass according to the invention, but the light transmission factor for this glass is at least 55% for the thickness of the glass of 3.9 mm and does not disclose a glass having a TLA4 value of less than 64.5% for a Fe2O3 content of less than 0.9%.

When talking about the optical properties of a glass sheet, it is usually necessary to relate these properties to a standard illuminating agent (the so-called illuminator). In the present specification, two standard illuminants are used, namely standard illuminant C (illuminator C) and standard illuminant A (illuminator A) as defined by Commission Internationale de l'Eclairage (CIE) [International Commission on Illumination]. Illuminating factor C means average daylight having a color temperature of 6,700 K (6,426.85 ° C). This illuminating factor is particularly useful in evaluating the optical properties of glass for glazing buildings. Illuminating factor A is the radiation of a Planck radiator at a temperature of approximately 2,856 K (2,582.85 ° C). This illuminating factor describes the light emitted by car headlamps and is intended primarily to evaluate the optical properties of motor vehicle windows.

The Commission Internationale de l'Eclairage also published a document entitled Colorimetrie, Recommandations Officielles CIE (Colorimetry and CIE Official Recommendations) (May 1970) which presents the theory by which the colorimetric coordinates for light of each wavelength of the visible spectrum are defined so that they can be represented in a graph with orthogonal x and y axes called the 1931 CIE chromaticity diagram. This chromaticity plot shows the typical position (ie, geometry) of light of each wavelength (expressed in nanometers) of the visible spectrum. This position is called a spectral locus, and light whose coordinates are located at that spectral locus is said to have 100% excitation purity at the corresponding wavelength. The spectral locus is closed by a line called the purple border, which connects the spectral locus points whose coordinates correspond to 380 nm (violet) and 780 nm (red). The area lying between the spectrum locus and the purple border is the area that is available for the tristimulus coordinates of any visible light. The coordinates of the light emitted by the illuminating factor C, for example, correspond to x = 0.3101 and y = 0.3162. This point C is considered to correspond to white light and therefore has an excitation purity of zero for each wavelength. Lines can be drawn from point C to the spectrum locus at any desired wavelength and each point

The position on these lines can be determined not only by its x and y coordinates, but also as a function of the wavelength of the corresponding line on which it is located and its distance from point C to the total wavelength line length. The hue of the light transmitted through the colored glass sheet can therefore be represented by its principal (dominant) wavelength lD and its excitation purity (P) expressed as a percentage.

In fact, the CIE coordinates of the light transmitted through the colored glass sheet will depend not only on the composition of the glass but also on its thickness. In this description and the claims, all values of excitation P purity and all values of the main (dominant) wavelength lD of transmitted light are calculated on the basis of the specific internal spectral transmission (SITl) for a glass sheet with a thickness of 5 mm under illumination with the illuminating agent C at a constant viewing angle of 2 °. The specific internal spectral transmission for a glass sheet is determined solely by the absorption of the glass and can be expressed using the Beer-Lambert law:

EA 1

SITl = e- ' lwhere A.l is the absorption coefficient (in cm-) of glass at a given wavelength, and E is the thickness (in cm) of the glass. For a first approximation, SITl can also be represented as a formula:

(I3 + R2) / (Ii - Ri), where I1 is the intensity of visible light incident on the first surface of the glass sheet, R1 is the intensity of visible light reflected by this surface, I3 is the intensity of visible light transmitted from the second surface of the glass sheet and R2 is an intensity of visible light reflected by this second surface towards the inside of the sheet.

The color rendering index, expressed by a number in the range of 1 to 100, means the difference between a color and its perception by the observer when he looks at a given color through a transparent transparent screen. The greater the difference, the lower the color rendering index. For a constant lD wavelength, the color rendering index perceived through a given glass decreases with increasing color purity of the glass. The color rendering index is calculated according to the standard standard EN 410, which defines the average color rendering index (Ic). The Ic factor used below is calculated for 4mm glass.

The following terms are also used in the following description and claims:

- total light transmittance for illuminating agent A (TLA) measured at a thickness of 4 mm (TLA4) at a constant viewing angle of 2 °. This total transmittance is the result of the integration between 380 and 780 nm wavelengths of the formula: S Tl.El.Sl/S El.Sl, where Tl is transmittance at wavelength l, El is the spectral distribution of the illuminating agent A and Sl is the sensitivity normal human eye as a function of wavelength l;

- total light transmittance (TE) measured at a thickness of 4 mm (TE4). This total transmittance is the result of integration between the wavelengths of 300 and 2150 nm of the formula: S Tl.El / S El, where El is the spectral distribution of the sun's energy at 30 ° above the horizon, with an air mass of 2 and the inclination of this glazing with respect to to the horizon at an angle of 60 °. This distribution, called "Moon distribution, is defined in standard ISO 9050;

- selectivity (SE) measured as the ratio of the total light transmittance of the illuminating agent A over the total energy transmittance (TLA / TE);

- total ultraviolet transmittance measured at a thickness of 4 mm (TUV4). This total transmittance is the result of the integration between the 280 and 380 nm wavelengths of the formula: S Tl.Ul / S Ul, where Ul is the spectral distribution of the ultraviolet radiation that passes through the atmosphere, as defined in standard standard DIN 67507.

- Fe proportion2+ total Fe, sometimes called the redox ratio, which is the value of the mass ratio of Fe atoms2+ to the total mass of iron atoms in the glass, and is obtained by the formula:

Fe2+/ total Fe = [24.4495 x log (92 / t1050)] / t-Fe2O3 where t1050 is the specific internal transmittance for 5 mm thick glass at 1050 nm wavelength and t-Fe2O3 is the total iron content expressed as Fe2O3 oxide and measured by X-ray fluorescence.

Colored glass can be used in architectural applications and as glazing for rail cars and motor vehicles. In architectural applications, generally 4 to 6 mm thick sheets of glass are used, while in the motor vehicle field, especially for the production of monolithic glazing, ordinary glass sheets are used.

In the case of laminated glazing, especially for windscreens for motor vehicles, sheets of glass with a thickness of 1 to 3 mm are used, two sheets of glass of this thickness being bonded together by a thin middle layer. substantially made of poly (vinyl butyral) (PVB).

One of the objectives of the present invention is to produce soda-lime glass containing iron, cobalt and chromium and / or vanadium, which combines optical and energetic properties, in particular an aesthetically attractive color and low energy transmittance, which are particularly but not exclusively useful in the field of motor vehicle glazing.

The subject of the invention is colored soda-lime glass, characterized by the fact that it contains:

iron in an amount expressed as mass of Fe2O3 oxide relative to the total mass of glass is in the range of 0.5 to 0.9% by weight based on the total amount of iron;

- iron (II) in an amount expressed as the mass of Fe atoms2+ based on the total mass of iron atoms present in this glass - the proportion of Fe2+/ total Fe - ranges from 25 to 45% by weight;

- an amount of cobalt, expressed as the weight of Co relative to the total weight of the glass, is at least 5 parts per million - ppm by weight;

- chromium and / or vanadium;

the glass has:

- TLA4 light transmittance, measured under the A illuminator and calculated for a glass thickness of 4 mm, within the range of 20 to 60%;

- TE4 energy transmission coefficient, measured according to the Moon's distribution and calculated for a glass thickness of 4 mm, within the range of 10 to 50%;

- dominant lD wavelength when transmitting less than 491 nm;

- excitation purity on transmission of at least 13.2%.

Preferably, the colored soda-lime glass has a total iron content of less than or equal to 0.89% by weight, preferably less than or equal to 0.88% by weight.

Preferably the colored soda-lime glass has a total iron content of at least 0.7% by weight, preferably at least 0.75% by weight.

Preferably the colored soda-lime glass comprises cobalt in an amount less than or equal to 300 parts per million by weight, more preferably 20 to 200 parts per million by weight, even more preferably in the range 60 to 120 parts per million by weight.

Preferably, the colored soda-lime glass contains chromium in an amount which, expressed as the weight of Cr2O3 relative to the total weight of the glass, is greater than 10 parts per million by weight, preferably greater than 20 parts per million by weight.

Preferably, the colored soda-lime glass contains chromium in an amount which, expressed as the weight of Cr2O3 relative to the total weight of the glass, is less than or equal to 300 parts per million by weight, preferably less than or equal to 250 parts per million by weight.

Preferably the colored soda lime glass contains vanadium in an amount which, expressed as a weight of V2O5 relative to the total weight of the glass, is in the range of 50 to 500 parts per million by weight.

Preferably the colored soda lime glass has a TLA4 light transmission factor in the range 25 to 55%, preferably in the range 38 to 52%.

Preferably the colored soda lime glass has a TE4 energy transmittance in the range 15 to 40%, preferably in the range 22 to 34%.

Preferably the colored soda-lime glass has a selectivity greater than 1.2, preferably greater than 1.35.

Preferably, the colored soda-lime glass has a dominant wavelength 1D transmitting less than or equal to 490 nm.

Preferably, the colored soda-lime glass additionally comprises titanium in an amount which, expressed as the weight of TiO2 relative to the total weight of the glass, is less than 2% by weight, preferably less than 1% by weight.

Preferably, the colored soda-lime glass additionally comprises titanium in an amount which, expressed as the weight of TiO2 relative to the total weight of the glass, is less than 0.1% by weight.

Preferably, the colored soda-lime glass additionally comprises cerium in an amount which, expressed as a weight of CeO2 relative to the total weight of the glass, is less than 2% by weight, preferably less than 1% by weight.

Preferably the colored soda-lime glass additionally comprises nickel in an amount which, expressed as a weight of NiO relative to the total weight of the glass, is less than 200 parts per million by weight, preferably less than 100 parts per million by weight.

PL 196 254 B1

Preferably, the colored soda-lime glass additionally comprises manganese in an amount which, expressed as a weight of MnO2 relative to the total weight of the glass, is less than 1500 parts per million by weight, preferably less than 500 parts per million by weight.

Preferably, the colored soda-lime glass has a magnesium content which, expressed as a weight of MgO relative to the total weight of the glass, is greater than 2% by weight.

Preferably, the colored soda-lime glass additionally contains selenium in an amount which, expressed as mass of selenium relative to the total weight of the glass, is less than 30 parts per million by weight, preferably less than 10 parts per million by weight.

The glass according to the invention has been found to meet both aesthetic and energetic conditions that are commercially desirable. In particular in the field of motor vehicles, the colored glass according to the invention may have a blue tint, having a predominant wavelength when transmitting less than 491 nm, which is desired by motor vehicle manufacturers, and low energy transmittance, thus reducing heating of the interior of the vehicle.

The presence of at least one of the chromium and vanadium components and the compositional criteria for iron and cobalt enable the production of glass whose predominant transmission wavelength and energy transmittance meet these aesthetic and energy criteria, especially those desired by motor vehicle manufacturers.

Iron is present in most glasses on the market, especially colored glasses. Presence of Fe ions2+ gives the glass a low absorption of visible light with short wavelengths (410 and 440 nm) and a very strong absorption of the ultraviolet band (absorption band centered at 380 nm), while the presence of Fe ions3+ produces strong infrared absorption (absorption band centered at 1050 nm). Presence of Fe ions3+ gives the glass a slightly yellow tint, generally considered not very attractive, while the iron ions are Fe2+ give the glass a clear blue-green tint. Therefore, the high concentration of Fe ions2+ in glass, it makes it possible to reduce TE energy transmittance and to give it an attractive color. However, the presence of iron in the molten glass basin causes the infrared radiation to be absorbed, which may be an obstacle to heat diffusion in the glass melting furnace and therefore may impede glass production. In addition, when the concentration of iron increases, the light transmittance of the glass in question decreases.

Moreover, the presence of cobalt tends to impart an intense blue tint to the glass.

Presence of Cr ionsIII tends to give the glass a slightly green tint, while the presence of Cr ionsVI gives the glass a very strong band absorption at 365 nm and a yellow color.

The presence of vanadium tends to give the glass a green hue.

The energy and optical properties of glass, especially its color, its light transmittance and its energy transmittance, result from complex interactions between its components. The behavior of these glass components depends on their redox state, and therefore on the presence of other components which may influence their redox state.

It has been found that the glass as defined in the claims enables the aesthetic (color) and optical and energetic criteria (light transmittance and energy transmittance) to be met by easily controlling its components in relation to iron, cobalt and chromium and / or vanadium.

The presence of iron in the indicated amount in the glass makes it easier to switch from the production of colorless glass to the production of colored glass.

Preferably the colored soda-lime glass has a total iron content of at least 0.7% by weight, preferably at least 0.75% by weight. This content leads to a low energy transmittance (TE) and a color that is pleasing to the eye.

In order to produce glass whose color is commercially desirable, which is referred to as pleasing to the eye, it has been found that preferably the glass meets one or more of the following criteria:

preferably the colored soda lime glass has a cobalt content of less than or equal to 300 parts per million (ppm) by weight. An excessively high amount of cobalt can damage the selectivity;

preferably the colored soda-lime glass contains cobalt in the range 20 to 200 parts per million (ppm) by weight, preferably in the range 60 to 120 parts per million (ppm) by weight, more preferably in the range 60 to 110 parts per million (ppm) ( ppm) by weight;

- preferably the colored soda lime glass contains chromium in an amount which, expressed as the mass of Cr2O3 relative to the total weight of the glass, is greater than 5 parts per million (ppm) by weight, 10 parts

% Per million (ppm) by weight, or even greater than 20 parts per million (ppm) by weight. Preferably, the glass comprises chromium in an amount greater than 50 parts per million (ppm) by weight;

preferably the colored soda-lime glass contains chromium in an amount which, expressed as the mass of Cr2O3 relative to the total weight of the glass, is less than or equal to 300 parts per million (ppm) by weight, preferably less than or equal to 250 parts per million (ppm) by weight, and especially less than or equal to 220 parts per million (ppm) by weight;

preferably the colored soda-lime glass contains vanadium in an amount which, expressed as the weight of V2O5 relative to the total weight of the glass, is greater than 20 parts per million (ppm) by weight. For example, it is in the range of 50 to 500 parts per million (ppm) by weight.

In a particular embodiment of the invention, the colored soda-lime glass preferably contains vanadium in an amount which, expressed as the weight of V2O5 relative to the total weight of the glass, is at least 20 parts per million (ppm) by weight. In the presence of such an amount of vanadium, the presence of chromium in such glass is no longer absolutely required to achieve the desired optical and energetic characteristics.

However, the colored soda-lime glass of the invention preferably contains vanadium in an amount of less than 20 parts per million (ppm) by weight. In that case, the presence of chromium in such glass is necessary for the realization of the invention.

In one embodiment, the colored soda-lime glass of the invention preferably contains both chromium and vanadium, for example chromium in an amount of 3 parts per million (ppm) by weight, and vanadium in an amount of 5 parts per million (ppm) by weight.

The colored soda lime glass according to the invention has a light transmission factor (TLA4) in the range 20 to 60%, preferably in the range 25 to 55% and more preferably in the range 38 to 52%. This TLA4 value makes the colored soda lime glass according to the invention very suitable for use, for example, as glazing of motor vehicles, especially for side windows or rear windows. For example, the TLA4 value may be in the range 40 to 48%.

Generally, it is desirable that the colored soda-lime glass of the present invention has an energy transmittance factor (TE4) in the range 10 to 50%, preferably in the range 15 to 40%, and more preferably in the range 22 to 34%. The low value of the energy transmittance coefficient allows, when the sun is shining, to limit the heating of the internal volume bounded by this glazing, such as the interior of a building or the interior of a motor vehicle.

For the darker version of the colored soda-lime glass according to the invention, the light transmission (TLA4) value is in the range 20 to 40%, preferably in the range 25 to 35%. In such a case, the value of the light transmission factor (TLA4) varies in the range of 10 to 30%, preferably 15 to 25%.

Preferably, the inventive colored soda-lime glass has a selectivity greater than 1.2 and more preferably greater than 1.35. High selectivity is advantageous for both motor vehicle and architectural applications, as it allows the reduction of solar heat build-up, thereby increasing the thermal comfort of users of such vehicles or buildings, while still providing a high level of natural light. and visibility through such glazing.

With regard to the color of the soda-lime glass of the invention, it is desirable that it has a dominant wavelength lD when transmitting less than or equal to 490 nm. This corresponds to glass whose color when transmitted is generally blue, which appears to be an attractive color to the human eye, and which is commercially highly desirable, especially for motor vehicle glazing. Preferably, the colored soda-lime glass according to the invention has a dominant wavelength 1D in transmission in the range 482 to 488 nm.

A purity of excitation purity of the soda-lime glass on transmission of at least 13.2% corresponds to the commercially desirable distinct color. Particularly preferred is an excitation purity in the range of 15 to 25%.

Preferably, the glass according to the invention has an average color rendering index (Ic) which meets the following condition:

Ic> -0.59P + 81, where P is absolute value (not percentage) purity. Preferably, the average color rendering index meets the following condition:

Ic> -0.59P + 84.

PL 196 254 B1

For a given glass purity, such a factor causes a very low distortion of the colors perceived by the observer through the sheet of such glass.

A high average color rendering index value means that the observer will have a natural perception of the environment through the inventive colored glass sheet.

Such an advantage is particularly desirable from a commercial point of view. This is because seeing through some other type of colored glass available on the market is stigmatized by the distortion of colors considered unattractive by users, especially when the environment and people seen through such glass look yellowish.

The inventive colored soda lime glass preferably has a total ultraviolet transmission of TUV4 of less than 30%. This makes it possible to limit the unattractive discoloration of objects placed inside the volume bounded by this type of glazing according to the invention, caused by the influence of solar ultraviolet radiation.

Preferably, the colored soda-lime glass according to the invention comprises titanium. The high amount of TiO2 runs the risk of imparting a yellowish color to the glass which is undesirable. In some cases, the glass will contain TiO2 only as a result of the presence of impurities, without any intended addition.

Preferably, the colored soda-lime glass according to the invention comprises cerium. It tends to shift the dominant wavelength towards green and yellow and therefore away from the preferred color. Moreover, complexion is a very expensive ingredient.

Preferably, the colored soda-lime glass according to the invention comprises nickel. The presence of nickel can compromise the selectivity of the glass containing this component as it does not absorb infrared light. The result is high values of the energy transmittance coefficient. Additionally, it gives the glass a yellow tint. In addition, the presence of nickel can contribute to glass manufacturing difficulties (formation of sulphate and nickel inclusions in the glass).

Preferably, the colored soda lime glass according to the invention comprises manganese. In the form of MnO2, it has an oxidizing effect in nature, which can alter the redox state of the iron and give the glass a green tint.

Preferably, the colored soda-lime glass according to the invention contains magnesium, the presence of which is advantageous for the fusing of the components during glass production.

Preferably, the colored soda-lime glass according to the invention contains selenium. The presence of selenium can give the glass a pink or red tint which is undesirable.

It is desirable that the glasses of the invention contain no fluorinated compounds, or at least that they constitute no more than 0.2% by weight of F atoms based on the total weight of the glass. This recommendation is due to the fact that such compounds cause the formation of scrap in the furnace, which is unfriendly to the environment and, moreover, is corrosive to the refractory materials lining the interior of the glass furnace.

The colored glass according to the invention is preferably used for the production of glazing for motor vehicles. It can, for example, advantageously be used as side windows or rear windows for vehicles.

The colored soda-lime glass according to the invention may advantageously be coated with a thin layer. Such a thin layer may be a metal oxide layer which reduces the rate to which it is heated by solar radiation and consequently reduces the rate to which the passenger compartment of a vehicle using this type of coated glazing is used as a window pane is heated.

The glass according to the invention can be produced by commonly used methods. Regarding the batch materials, it is possible to use natural materials, recycled glass, slag or a combination of these materials. The ingredients of this glass are not necessarily added in the form shown, but this method of indicating the amounts of the ingredients added, in forms equivalent to those shown, corresponds to standard practice. In practice, iron is generally added in the form of artificial iron red, cobalt is added as a hydrous sulphate such as CoSO4^ 7H2O or CoSO46H2O, and the chromium is added in the form of a dichromate such as K2Cr2O7. Cerium is often introduced as an oxide or carbonate, and vanadium is introduced as vanadium oxide or sodium vanadate. Selenium, when present, is added in elemental form or in the form of selenite such as Na2SeO3 or ZnSeO3.

Other components are sometimes present as impurities in the batch materials used to make the glass according to the invention, whether in natural materials, in recycled glass or in slag, which are used more and more, but when the presence of these impurities does not

When given to the glass with properties outside the range defined above, these glasses are considered to be in accordance with the present invention.

The present invention will be illustrated by the following examples:

Examples 1 to 75

Table I gives a non-limiting indication of the basic composition of the glass. Obviously, glass having the same optical and energetic properties can be obtained with a basic glass composition in which the amounts of oxides do not fall within the ranges of the percentages by weight given at the beginning of the present invention.

The glasses of the present examples contain less than 1% by weight of TiO2, less than 0.1% by weight of CoO2, less than 100 parts per million (ppm) by weight of NiO, less than 500 parts per million (ppm) by weight of MnO2, less than 30 parts by weight (ppm) by weight of Se, and greater than 2% by weight of MgO. Such glasses have an average color rendering index (Ic) for glass with a thickness of 4 mm greater than (-0.59P + 81). The exact value of the average color rendering index (Ic) was given in each case, if known.

Unless otherwise stated, the glass of the invention contains less than 10 parts per million (ppm) by weight of V2O5.

Table I.

The basic composition of the glass

SiO2 71.5 to 71.9%

Al2O3 0.8%

CaO 8.8%

MgO 4.2%

Na2O 14.1%

K2O 0.1%

SO3 0.05 to 0.45%.

The tables below show the component concentrations as well as the optical and energetic properties of the glass according to the invention (the "-" sign indicates samples for which no measurements were made). Concentrations were determined by glass X-ray fluorescence and converted to the given molecular variations.

The light transmittance factor Tx of the produced glass of thickness x can be converted into the light transmittance factor Ty of the glass of thickness y by the following formula:

You = (1- r)2

<td>Ι_ (ι - r)2 ύ</td><td>where r =</td><td>ęn+10</td>

and n = 1.5.

Tables II to XIV:

<td>Example</td><td>No. 1</td><td>no 2</td><td>no 3</td><td>no 4</td><td>no 5</td><td>no 6</td>

<td>Fe2+ / total Fe (%)</td><td> 36,28</td><td> 34,26</td><td> 33,20</td><td> 27,02</td><td> 40,00</td><td> 25,35</td>

PL 196 254 B1 cont. Table II to XIV

<td>Selectivity</td><td> 1,33</td><td> 1,43</td><td> 1,30</td><td> 1,21</td><td> 1,5</td><td> 1,31</td>

"-" means that the measurements were not performed

<td>Example</td><td>no.7</td><td>no.8</td><td>no 9</td><td>no.10</td><td>no.11</td><td>no.12</td>

<td>Fe2+ / total Fe (%)</td><td> 26,30</td><td> 31,77</td><td> 31,92</td><td> 40</td><td> 31,55</td><td> 33,13</td>

<td>Selectivity</td><td> 1,22</td><td> 1,43</td><td> 1,42</td><td> 1,49</td><td> 1,57</td><td> 1,46</td>

<td>Example</td><td>no 13</td><td>no.14</td><td>no 15</td><td>no 16</td><td>no 17</td>

<td>Fe2+ / total Fe (%)</td><td> 38</td><td> 37,90</td><td> 44,78</td><td> 38,32</td><td> 44,91</td>

PL 196 254 B1 cont. table

<td>Selectivity</td><td> 1,45</td><td> 1,54</td><td> 1,61</td><td> 1,54</td><td> 1,63</td>

<td>Example</td><td>no 18</td><td>no 19</td><td>no 20</td><td>no 21</td><td>no 22</td><td>no 23</td>

<td>Fe2+ / total Fe (%)</td><td> 38</td><td> 38</td><td> 38</td><td> 38</td><td> 42</td><td> 42</td>

<td>Selectivity</td><td> 1,44</td><td> 1,50</td><td> 1,55</td><td> 1,61</td><td> 1,52</td><td> 1,58</td>

<td>Example</td><td>no 24</td><td>no 25</td><td>no 26</td><td>no 27</td><td>no 28</td><td>no 29</td>

<td>Fe2+ / total Fe (%)</td><td> 42</td><td> 42</td><td> 36</td><td> 36</td><td> 36</td><td> 36</td>

<td>Selectivity</td><td> 1,64</td><td> 1,71</td><td> 1,32</td><td> 1,39</td><td> 1,43</td><td> 1,49</td>

PL i96 254 Bi ii

<td>Example</td><td>no 30</td><td>no 31</td><td>no 32</td><td>no 33</td><td>no 34</td><td>no 35</td>

<td>Fe2+ / total Fe (%)</td><td> 43</td><td> 45</td><td> 45</td><td> 41</td><td> 39</td><td> 32</td>

<td>Selectivity</td><td> 1,64</td><td> 1,71</td><td> 1,66</td><td> 1,51</td><td> 1,45</td><td> 1,17</td>

<td>Example</td><td>no 36</td><td>no 37</td><td>no 38</td><td>no 39</td><td>no 40</td><td>no 41</td>

<td>Fe2+ / total Fe (%)</td><td> 30</td><td> 28</td><td> 31</td><td> 31</td><td> 30</td><td> 32</td>

<td>Selectivity</td><td> 1,15</td><td> 1,12</td><td> 1,18</td><td> 1,18</td><td> 1,34</td><td> 1,27</td>

<td>Example</td><td>no 42</td><td>no 43</td><td>no 44</td><td>no 45</td><td>no 46</td><td>no 47</td>

PL 196 254 B1 cont. table

<td>Fe2+ / total Fe (%)</td><td> 30,5</td><td> 28</td><td> 40</td><td> 34</td><td> 36</td><td> 33</td>

<td>Selectivity</td><td> 1,37</td><td> 1,40</td><td> 1,48</td><td> 1,29</td><td> 1,47</td><td> 1,21</td>

<td>Example</td><td>no 48</td><td>no 49</td><td>no 50</td><td>no 51</td><td>no 52</td><td>no 53</td>

<td>Fe2+ / total Fe (%)</td><td> 38</td><td> 37</td><td> 34,5</td><td> 37,5</td><td> 38,5</td><td> 42</td>

<td>Selectivity</td><td> 1,38</td><td> 1,48</td><td> 1,30</td><td> 1,41</td><td> 1,64</td><td> 1,37</td>

<td>Example</td><td>no 54</td><td>no 55</td><td>no 56</td><td>no 57</td><td>no 58</td><td>no 59</td>

<td>Fe2+ / total Fe (%)</td><td> 39</td><td> 41</td><td> 38</td><td> 37</td><td> 42</td><td> 43</td>

PL 196 254 B1 cont. table

<td>Selectivity</td><td> 1,45</td><td> 1,480</td><td> 1,37</td><td> 1,30</td><td> 1,58</td><td> 1,47</td>

<td>Example</td><td>no 60</td><td>no 61</td><td>no 62</td><td>no 63</td><td>no 64</td><td>no 65</td>

<td>Fe2+ / total Fe (%)</td><td> 41</td><td> 39</td><td> 35</td><td> 38</td><td> 38</td><td> 40</td>

<td>Selectivity</td><td> 1,58</td><td> 1,64</td><td> 1,46</td><td> 1,46</td><td> 1,46</td><td> 1,49</td>

<td>Example</td><td>no 66</td><td>no 67</td><td>no 68</td><td>no 69</td><td>no 70</td><td>no 71</td>

<td>Fe2+ / total Fe (%)</td><td> 40</td><td> 40</td><td> 39</td><td> 42</td><td> 41</td><td> 41</td>

<td>Selectivity</td><td> 1,49</td><td> 1,50</td><td> 1,53</td><td> 1,58</td><td> 1,51</td><td> 1,50</td>

PL 196 254 B1

<td>Example</td><td>no 72</td><td>no 73</td><td>no 74</td><td>no 75</td>

<td>Fe2+ / total Fe (%)</td><td> 38</td><td> 41</td><td> 40</td><td> 38</td>

<td>Selectivity</td><td> 1,42</td><td> 1,50</td><td> 1,50</td><td> 1,45</td>

Patent claims

1. Colored soda-lime glass, characterized in that it contains:

Contents4

21 members in 13 offices

This recordMember, by publication datePriority claim3 more offices are in the list below

Priority claims7

Priority claims
Document	Office	Kind	Date
00202125	European Patent Office (EPO)	A	2000-06-19
00202125	European Patent Office (EPO)	A	2000-06-19
0106861	European Patent Office (EPO)	W	2001-06-14
0106861	European Patent Office (EPO)	W	2001-06-14
002021251	–	–	–
EP20000202125	–	–	–
WO2001EP06861	–	–	–

Members21

Family members, oldest first
Document	Office	Kind
WO0198221A1	World Intellectual Property Organization (WIPO)	A1	2001-12-27
AU6753901A	Australia	A	2002-01-02
EP1296900A1	European Patent Office (EPO)	A1	2003-04-02
BR0112194A	Brazil	A	2003-05-13
CN1437565A	China	A	2003-08-20
JP2003535805A	Japan	A	2003-12-02
CZ20024206A3	Czechia	A3	2004-01-14
US2004157723A1	United States of America	A1	2004-08-12
PL359757A1	Poland	A1	2004-09-06
CN1206183C	China	C	2005-06-15
EP1296900B1	European Patent Office (EPO)	B1	2005-06-15
AT297880T	Austria	T	2005-07-15
ATE297880T1	Austria	T1	2005-07-15
DE60111527D1	Germany	D1	2005-07-21
ES2242751T3	Spain	T3	2005-11-16
DE60111527T2	Germany	T2	2006-05-11
US7304009B2	United States of America	B2	2007-12-04
PL196254B1This record	Poland	B1	2007-12-31
RU2327657C2	Russian Federation	C2	2008-06-27
CZ301525B6	Czechia	B6	2010-03-31
JP4916082B2	Japan	B2	2012-04-11

Coloured soda-lime glass

Abstract

Term

EA 1

PL 196 254 B1

PL 196 254 B1

PL 196 254 B1

Priority claims7

Members21

Events

Numbers

Titles2

Classification