JPS58158282A - Pressure-sensitive transfer material - Google Patents

Abstract

PURPOSE:To obtain a pressure-sensitive transfer material free of the delamination of ink layer and excellent in stability of liquid, producibility, and curling property by a method in which an adhesive layer containing a specific polymer and an ink layer composed primarily of a resin, an oil, and a colorant are orderly provided on a film base material. CONSTITUTION:A pressure-sensitive transfer material consists of a film base material, an adhesive layer provided on the base material, and an ink layer composed of a resin, an oil having bad compatibility with the resin, and a colorant, provided on the adhesive layer. The resin of the adhesive layer contains as main component a mixture consisting of the polymer of 90-100wt% methyl methacrylate and/or ethyl methacrylate or copolymer (A) of the methacrylate with 0- 10wt% an unsaturated carboxylic acid and the polymer of 90-100wt% acryl monomer having a glass transition point of 25 deg.C or lower when solely polymerized or copolymer (B) of the acryl monomer with 0-10wt% an unsaturated carboxylic acid.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink-releasing pressure-sensitive transfer material containing a novel adhesive layer component.

Conventionally, overstrike ribbons for reader printers have had an ink layer on a film base material such as polyethylene or polyester. However, in order to increase print density, it was necessary to reduce the binder content in the ink layer. For this reason, as a side effect, the adhesiveness with the film base material such as polyester decreases - When the image forming pressure from the brinter is applied, the ink layer peels off from the film base material and is transferred to the transfer paper, resulting in an overstrike function. When the ribbon is wound around the core, there is a problem that the ink layer or the back side of the polyester film base material is likely to stick.

Therefore, in order to solve the above problem, it has been proposed to provide an intermediate layer. For example, U.S. Patent No. 5,671,2
No. 87 describes the use of a linear polyester resin, while US Pat. No. 93Q099 describes the use of a crosslinkable acrylic resin. In the former case, there will be no problem of reduced print density or peeling of the ink layer, but the image will be slightly thicker (decreased sharpness).
In addition, in the latter case, because of the crosslinking property, the storage stability of the liquid and the degree of crosslinking vary, the adhesion and the image change, and the short pot life of the liquid makes it difficult to manufacture. This results in the problem of a lack of.

The present invention has been made in view of the above problem K, and
By using a mixture of specific copolymers as the resin component of the adhesive layer, it has good adhesion to the Sifilm base, has weak curling, and has a long pot life (preservability). We were able to. In other words, the main objectives of the present invention are to ensure that the ink layer does not peel off just before printing (improved multitasking properties), that the printing quality is good (high 1m, high sharpness), and that the liquid stability and manufacturability are good. An object of the present invention is to provide an adhesive layer for an ink-releasing pressure-sensitive transfer material.

The ink-release pressure-sensitive transfer material of the present invention includes a film base material, an adhesive layer provided on the base material, and a film base material provided on the adhesive layer.
``L9 resin, an ink layer mainly composed of an oil and a colorant that are compatible with the resin, and the adhesive layer resin contains (AJ 90 to 1001 amounts of methyl methacrylate and/or ethyl methacrylate and O ~1o1i:i
Copolymer of ts with unsaturated carboxylic acid and (B) 90 to 100 weight-9 homopolymer 2
An acrylic monomer with a glass transition point of 5°C or less and 0
It is characterized by comprising as a main component a mixture consisting of a copolymer or polymer with ~10% by weight of an unsaturated carboxylic acid.

The main components of the adhesive layer in the present invention are as described above (
Although it is a mixture of N component and the above (B) component, ((conversion)
The mixing ratio of component and (B) component is 99.5105 to 501
It is desirable that it be in the range of 50. If the amount of component (B) is too large, the component (B) will mix into the ink layer and reduce the print density, which is undesirable. Further, as other resin components, for example, vinyl chloride-vinyl acetate copolymer, styrene-butadiene copolymer, or vinyl acetate resin may be added as long as it is 10% by weight or less. Furthermore, pigments such as clay, calcium sulfate, calcium sulfate, and silica may be added for the purpose of preventing blocking. At this time, in order to improve the pigment dispersibility, 10% by weight or less of unsaturated carboxylic acid such as acrylic acid, methacrylic acid, itaconic acid, fumaric acid, maleic acid, tm hydromaleic acid, crotonic acid, etc., should be added as a component of the polymer. Copolymerization using an acid can also be used.

Examples of acrylic esters having a glass transition temperature of 25° C. or lower and methacrylic esters that can be used in the present invention include stearyl methacrylate, n-butyl methacrylate, ethyl acrylate, and 2-etherhexyl acrylate. Can be done.

Furthermore, known ink layers can be used as the ink layer in the present invention. That is, as the resin for the ink layer, conventionally known vinyl chloride-vinyl acetate copolymers, acrylic resins, polycarbonates, polyvinyl butyral, etc. can be used. Further, as the oil, vegetable oils such as castor oil, rapeseed oil, olive oil, and camellia oil, mineral oils such as spindle oil, liquid paraffin, and petrolactam, and animal oils such as lard, lanolin, and whale oil can be used. Furthermore, as colorants, carbon black, iron oxide, which is also known in the past,
Black colorants such as nigrosine base, cyanine blue,
Blue colorants such as oil blue, alkali blue, methyl violet, orange red, iozole red,
You can use rose bengal, crystal violet, brilliant green, etc.

The pressure-sensitive transfer material of the present invention can be prepared by known methods.
An adhesive layer is provided by dissolving the adhesive in, for example, toluene, applying this solution to one side of the film base material, and drying it. At this time, the thickness of the adhesive layer should be approximately 1 to 10 μm, preferably 6 to 7 μm. Next, resin (e.g., vinyl chloride-vinyl acetate copolymer), oil incompatible with the resin (e.g. , castor oil), a colorant (for example, carbon black), and an organic solvent (for example, methyl ethyl ketone) are mixed and dispersed in a ball mill or the like to prepare a liquid for the ink layer, and this is applied onto the adhesive layer and dried. An ink layer is provided by.

Next, the present invention will be explained in more detail with reference to examples as well as comparative examples, but the present invention is not limited thereto.

Example 1 Methyl methacrylate and methacrylic acid (weight ratio = 99.5/α5) were placed on one side of a 7μ thick polyester film.
) copolymer (A) with n-butyl methacrylate and acrylic acid (weight ratio = 99/1) (B)
20 wt s each of toluene solutions of (A)/(B)
A mixture of 80/20 by weight was coated and dried to obtain an adhesive layer having a thickness of 2.5 μm.

Next, a solution prepared by dispersing a component consisting of methyl ethyl ketone 97 1 for 12 hours using a ball mill was applied onto this and dried to obtain an ink layer having a dry edge thickness of 10 μm.

Example 2 Ethyl methacrylate and acrylic &(u)! on one side of a 7μ thick polyester film. ;9V6) copolymer (A) with n-butyl methacrylate and acrylic lit!
(Weight ratio = 99/1) of co-1 combination (B) with 7
'L20IIL'ltsToluene solution (A)/(B)
A mixture with a weight ratio of 9515 K was coated and dried to obtain an adhesive layer having a thickness of 15 μm.

Next, apply the ink prepared in Example 1 above,
After drying, a 16 μm thick layer was obtained.

Example 6 In place of the adhesive layer made of a mixture of methyl methacrylate-methacrylic acid copolymer and n-butyl methacrylate-acrylic acid copolymer in Example 1, ethyl methacrylate-7malic acid (weight ratio 95:5) was used. Adhesive layer obtained by mixing equal amounts of a 20% by weight toluene solution of the polymer) and a 20% by weight toluene solution of the n-butyl memethacrylate-acrylic # (weight ratio 99:1) copolymer (B), coating and drying. A transfer material was created using

Example 4 In place of the adhesive layer of Example 1, 50 parts by weight of methyl methacrylate-acrylic acid (weight ratio 99:1) copolymer (A) and n-butyl acrylate-itaconic acid (weight ratio 97:1) were used.
6) A transfer material was prepared in the same manner as in Example 1 except that a mixture with 50 parts by weight of copolymer (B) was used.

Example 5 In place of the adhesive layer of Example 1, 50 parts by weight of methyl methacrylate-acrylic acid (99:1 weight ratio) copolymer (4) and 2-ethylhexyl acrylate-Fumaru I! A transfer material was prepared in the same manner as in Example 1 except that a mixture with 50 parts by weight of copolymer (B) (weight ratio 99:1) was used.

Comparative Example Instead of the copolymer mixture in Example 1, an adhesive layer with a thickness of 2 μm was provided using a 10s methyl ethyl ketone solution of J) K polyester resin (Toyobo's Byronna 200), and an adhesive layer of Example 1 was further applied on C (D). The ink used was applied and dried to obtain an ink layer with a thickness of 13 tones.

When printing was performed using a commercially available printer (RP-1600 manufactured by Ricoh) on the six types of pressure-sensitive transfer materials tabulated in the above Examples and Comparative Examples, the following results were obtained.

Example 1 103 [No 132 #2
too [1317 none 1
3 tol (131 no #
4t03 α617 None #5 100 C131st.

Comparative example tol α68
Thickness of character line
・Excellent results were obtained.

Claims (1)

[Claims] A film base material, an adhesive layer provided on the base material, and an ink layer mainly composed of an oil and a colorant that are poorly compatible with the resin provided on the adhesive layer and the skeleton resin). The resin of the adhesive layer is (N90-100% by weight of methyl methacrylate and/or ethyl methacrylate and 0-1
When a copolymer with an unsaturated carboxylic acid of 0 weight - is used as a polymer and (B) a homopolymer of 90 to 100 weight -, an acrylic monomer having a glass transition point of 1125°C or less and a 0 to 10 weight An ink-release type pressure-sensitive transfer material comprising as a main component a mixture of a copolymer or a polymer with an unsaturated carboxylic acid.