Ink sheet for thermal transfer printer

[Detailed Description of the Invention]

[Industrial Application] the present invention relates to the materials for printers -- further -- detailed In the thermal transfer printer using a heat fusion type transfer ink ribbon, the roadability of a thermal head is good, and the fused ink images are transferred sharply and it is related with the ink sheet which does not carry out the stick of a character or the picture to a hot thermal head with the degree of high Fulfillment though a printing character is possible. [Conventional technology and the problem which it is going to solve] In high ''1 Si, the color picture in which the printer of a fused type heat transfer method is especially printable in a regular paper, and clear, and Chinese character printing, since it is printable with a comparatively compact device, the needs of end Puri / Tarr, such as a power 2-printer and a Japanese kanji printer, attract attention these days. The printer of these fused type heat transfer methods is a regular paper to the heat transfer ink sheet which consists of a substrate and thermally fusible ink layers, such as a film and thin paper, For example, the acceptance paper consisting of the usual paper of fine quality etc. is piled up, with the heat from the thermal head according to an electric signal, the required image part of a thermally fusible ink layer is transferred on acceptance paper, and a picture is formed in the acceptance paper. Since paints can be used for a thermal-transfer-recording method as the main ingredients of the coloring material in ink, it becomes possible [ the conventional thermal paper using leuco dye and the endurance of different Si and printing ] for Ah Si and long-term preservation. However, since this thermal transfer printer is with a thermal head like the thermal paper which used leuco dye, a stick with the thermoplastic substrate of an ink sheet serves as generating, Si, and a run trouble. An ink sheet base material here is a film of thermoplastic polymers (polyester etc.). Various art is released in order to prevent this stick. The application of the stick prevention agent is often performed especially. Applying inorganic system paints, such as calcium carbonate, as a stick prevention agent, and applying starch etc. as a Tangential layer agent is known. however, when it comes to a cost rise, this processing be elaborate simultaneously -- be alike -- the Si thickness increased, sensitivity fell and it made difficult improvement in the speed of the thermal transfer printer. Parting agents, such as silicon resin, are applied. Although there is the 1 stick prevention effect without 8 intermediaries also increasing thickness greatly, to a high-speed thermal head, sufficient effect is not acquired easily. In a thermal transfer printer, in order to respond hotly from a thermal head, and for Heat Transfer, Inc. to cause a solid -> fluid -> solid and a phase change and to carry out adhesion transition by the pattern corresponding to a heating pattern at acceptance paper, there is a tendency for head skin temperature to be high as a high speed printer. That is, what is called a high-speed thermal head with short heating pulse width of what tendency is large. For this reason, in the above-mentioned stick prevention agent, sufficient effect is not expectable. As the small non-impact printer of a heat transfer method being in use, it is used for a high-speed use for kanji printers as a small object for color printers again in many cases, and the ink sheet without a stick, i.e., the highly efficient stick prevention agent for heat transfer ink sheets, was requested from it. [Objects of the Invention] An object of the present invention is to provide the ink sheet for thermal transfer printers which applied to the back of a substrate the stick prevention agent which has good stick-proof nature. [Elements of the Invention] As a result of repeating research wholeheartedly that these artificers should improve an above-stated fault, it is preferably about silica, preferably particulate silica which blocked a hydrophilic radical by the Silang coupling agent, A polymeric mass with fissility is applied to the sheet back as a binder, Although a stick prevention layer can be formed if it found out that a heat transfer ink sheet which prevented a stick could be obtained, however a coat is made to form by using as a binder polymers which have fissility in silica, Because of the hydrophilicity of silica, and the hydrophobicity of a parting agent, film strength fell and stick prevention layer formation with firm mechanical strength was difficult. While these artificers made a hydrophilic radical of a silica particle block and canal-ize by the Silang coupling agent, stick-proof nature was excellent in selecting a binder, and they found out that stick prevention processing for heat transfer ink sheets in which there are no omission of particles was possible. Scales were found out using a good binder, Do poly dimethylsiloxane, or amino alkyd resin. Although a stick prevention agent for heat transfer ink sheets of the present invention contains particulate silica which carried out the surface treatment to hydrophobicity by particulate silica and/or the Silang coupling agent and consists of other granular material ingredients and adhesives, it is preferred that high polymer adhesives with especially fissility are included. As other combination ingredients, it can add in required quantity if needed [, such as an antioxidant, ]. polyester, polycarbonate, and doria -- Heat Transfer, Inc. is Coating(ed) to an opposite side after applying the above-mentioned stick prevention agent to thickness '5~30micrometer films, such as Cetyl cellulose, nylon, and polyimide, to make a heat transfer ink sheet. Trimethoxysilane and dimethoxysilane are mentioned as a 72 A cutlet pulling agent used by the present invention. As adhesives of unsettled particulate silica, although starch, polyvinyl alcohol, aceto acetylation polyvinyl alcohol, or an acrylic resin is used, polyvinyl alcohol and Haaseto acetylation polyvinyl alcohol are especially excellent. As adhesives of silica which carried out Silang coupling processing, although poly dimethylsiloxane, a silicon acrylic resin, amino alkyd resin, polyester, polyurethane, etc. can be used, resin which has fissility, such as poly dimethylsiloxane and a silicon acrylic resin, especially is suitable. As for secondary particle diameter of silica, it is desirable that it is 10micro or less. It is possible to use together, other paints, for example, silicic acid calcium etc., etc. A stick prevention agent for heat transfer ink sheets of the present invention is a silica particle 25-fold [ more than alpha2 % of the weight and ] (if below i Chi contains, there is the stick prevention effect to a thermal head, and roadability is good.) Since Smooth Si nature is poor, a stick becomes it remarkable that it is below a mentioned range. Problems, such as poor Heat transfer and a film strength fall, crop up that it is more than a mentioned range. 15~5 weight - is especially preferred. In particular, it is preferred that a ratio of Silang coupling processing silica is more than 60 weight - of silica. [Example] Next, the ink sheet for thermal transfer printers which gave the example and applied the stick prevention agent of the present invention is explained. Example 1 dissolving and distributing particulate silica (Mizuka seal P52+6) 101 and 40 polyvinyl alcohol (Japanese synthetic chemistry GL-05) at water 200p -- Paint 1t - it prepared. This paint was Coating(ed) at a rate of 217 m" to the 6-micro-thick polyester film, and heat transfer ink sheet base material 1 was obtained. Example 2 About particulate silica (Mizuka seal P52d) 51p, it is in toluene solvent 100O-, r-glycoxyde Xyprovir which is 72 A cutlet pulling agent -- it was made to react to IJ Methoxy 2 A (Torre silicone and 8 [!! ] -6040) alpha1f, Silang coupling processing was carried out, and Silang coupling processing silica was prepared. This surface treatment silica 5 P s poly dimethylsiloxane 500jj() - In ResiliconBD72S6 and toluene 690P, it dissolves and distributes, paint 2 is prepared, and it is a sense. this paint 2 -- a 6-micro-thick polyester film (it Coating(ed) at a rate of L two person /, and -, and after dryness, it was made to harden by 120 degreeC for 1 minute, and heat transfer ink sheet base material 2 was obtained.) Comparative example 1 Poly dimethylsiloxane 10'jl/ ()-Lesiri corn 8RX211 3o%yzy solution hardening agent (Torre silicone 8D7220 30 Chitoluen solution) IP is dissolved and distributed at toluene 895E, paint 3 is prepared, and it is the next. Coating this paint 3 at a rate of alpha2 P/m2 to a 6-micro-thick polyester film, and it is made to harden by 120 degreeC after dryness for 1 minute, and elated in heat transfer ink sheet base material 3. Comparative example 2 What has nothing stick prevention agent Coating was made the 6-micro-thick polyester film with substrate 4. Evaluation Black Heat Transfer, Inc. was applied to the above application side and opposite side of substrate 1~4 for heat transfer ink sheets at a rate of 517 m", and the heat transfer ink sheet was obtained. Paper of fine quality is used for these ink sheets as acceptance paper, and they are 19 mV, 1 m seconds, and 8 aot/am with a heat transfer printing testing machine. Transfer printing was carried out on printing conditions, and the stick of a thermal head and an ink sheet was evaluated. An evaluation result is shown in table-1. Ink sheet evaluation for table-1 heat transfer In Qusy X tick generating Image concentration 1 example 1 Substrate 1 0 delta2 example 2 2 O03 comparative example 1 3 delta x44 comparison 2 4 x delta -- this result shows that the ink sheet for heat transfer of the present invention is excellent.