JPH10119442A - Negative and positive film manufacturing sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture with good accuracy negative and positive films of high definition and high tone pattern and of superior durability in a manufacturing method for manufacturing the negative and positive films by using a release ribbon and releasing by a thermal transfer printer. SOLUTION: A transparent thermoplastic release agent of melting point of 40-85 deg.C is applied on one face of a transparent base film. Then an ultraviolet shielding resin layer composed of nixed resin formed of carbon black dispersed ethylene acetate vinyl copolymerized resin into which carbon black having an oil absorption of 101ml/100g and a particle size of 20-40mμ are dispersed and blended by the solid content weight ratio of 50-60wt.% and ketone resin and polyethylene wax is laminate-applied on a release agent coated surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal transfer printer head using a thermal ribbon for peeling.
The present invention relates to a sheet for producing a high-definition negative sheet or positive sheet by removing characters and patterns from the sheet of the present invention in contact with the thermal ribbon for release.

[0002]

2. Description of the Related Art Conventionally, in the field of printing, when producing a negative film or a positive film for producing a printing plate, a silver halide film is photographed with a camera or the like, and then developed.
The use of photoengraving technology performed in steps such as fixing and drying was common. For this reason, photoengraving requires many work steps, and requires advanced technology and expensive equipment. In addition, although there is already a technology to produce a negative film by peeling using a thermal transfer printer, there is no sheet that can produce a negative film with fine characters and patterns or gradation patterns with accuracy comparable to photographs, and Recently, there has been a problem with the durability of the negative film, and with the development of computer graphics, high-definition, high-gradation image processing has become possible. There is also a problem that it cannot be produced, and it has not yet been sufficiently replaced by photolithography.

[0003]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention applies a transparent thermoplastic release agent to one surface of a transparent substrate film, and forms a transparent thermoplastic release agent layer on the transparent thermoplastic release agent layer. Negatives that enable high-definition, high-gradation pattern reproduction by applying a UV-resistant resin layer with excellent durability
It is intended to provide a positive production sheet.

[0004]

In order to solve the above-mentioned problems, the negative / positive sheet of the present invention comprises a transparent base material film coated with a transparent thermoplastic release agent layer on one side thereof, It is a sheet in which an ultraviolet shielding resin layer having excellent durability is laminated and applied on a plastic release agent layer. That is, the present invention forms at least (A) a transparent thermoplastic release agent layer having a melting point of 40 to 85 ° C. on one surface of a transparent base film, and (B) Negative, characterized by forming and laminating an ultraviolet shielding resin layer containing the following components:
It is a sheet for making a positive. Dispersion composition of 50 to 60% by weight of carbon black and 40 to 50% by weight of ethylene / vinyl acetate copolymer resin Ketone resin Polyethylene wax

[0005] The melting point of the transparent thermoplastic release agent required to achieve the present invention is 40 to 85 ° C. Regarding the melting point, although the lower one is excellent in the releasability at the time of producing a negative / positive sheet, the melting point is less than 40 ° C. when the ultraviolet ray shielding resin layer is laminated and applied on the thermoplastic release agent layer,
There is a possibility that the release agent layer and the ultraviolet shielding resin layer may be mixed, and peeling failure is likely to occur at the time of producing a negative / positive sheet with a thermal transfer printer. The melting point of the thermoplastic release agent layer is 85.
When the temperature exceeds ℃, the releasability from the ultraviolet shielding resin layer is poor, peeling failure is likely to occur, the energy load on the head of the thermal transfer printer is increased, and a negative sheet or a positive sheet cannot be produced smoothly. Further, when the thermoplastic release agent layer is not provided, the ultraviolet shielding resin layer easily adheres to the transparent substrate film, making it difficult to peel off. Similarly, a negative sheet or a positive sheet cannot be produced smoothly. The optimum thickness of the thermoplastic release agent layer is 1
４4 μm is preferred. The reason is that if it is less than 1 μm, it is difficult to uniformly apply the thermoplastic release agent layer on the transparent base material film, and there is a possibility that an application defect occurs, and the ultraviolet shielding resin layer laminated on the thermoplastic release agent layer is Some portions are directly applied to the transparent substrate film, and are likely to cause peeling failure of the ultraviolet shielding resin layer.

If it exceeds 4 μm, not only the transparency of the thermoplastic release agent layer is impaired, but also the lamination of the ultraviolet shielding resin layer is deteriorated, the abrasion resistance is reduced, and the storage durability of the negative sheet is deteriorated. There is a tendency. Examples of the thermoplastic release agent layer include ester wax, paraffin wax, candelilla wax, carnauba wax, microcrystalline wax, oxidized wax, wood wax, beeswax, and the like. Carnauba wax dispersion with high dispersibility is optimal because it is necessary to maintain transparency when producing negative and positive sheets. In the ultraviolet shielding resin layer, it is necessary to easily peel off from the thermoplastic release agent layer by using a peeling ribbon by using a thermal transfer printer. For that purpose, it is necessary that the material has a low softening temperature and good adhesion to the peeling ribbon. Further, in order to exhibit the function of the ultraviolet shielding resin layer, a material in which carbon black is stably and highly dispersed is necessary. In this respect, ethylene-vinyl acetate copolymer resin (hereinafter also referred to as ethylene-vinyl acetate resin)
Is optimal.

[0007] It is generally known that ethylene-vinyl acetate copolymer resin changes the copolymer composition of ethylene and vinyl acetate, but when the vinyl acetate content is 30% or less,
The dispersibility of carbon black tends to decrease. On the other hand, when the vinyl acetate content is 50% or more, the film properties of the coating film are increased, and it is extremely difficult to produce fine characters and patterns. The weight average molecular weight of these ethylene-vinyl acetate copolymer resins is preferably from 40,000 to 60,000, and the glass transition temperature is preferably from -40 to -50C. The carbon black dispersion compounding ratio is preferably 50 to 60% by weight based on the total of the solid content of the ethylene-vinyl acetate copolymer resin and the carbon black. If the amount is less than 50% by weight, the ultraviolet ray shielding effect is small. Tends to have poor stable dispersibility. The thickness of the ultraviolet shielding resin layer is preferably 2 to 6 μm, and if it is 2 μm or less, there is no ultraviolet shielding effect, and if it is 6 μm or more, the coating film strength becomes too strong, and a high-definition pattern cannot be obtained.

Further, in the present invention, the hardness is increased by adding a ketone resin having a softening point of 100 to 120 ° C. in the ultraviolet shielding resin layer, and the durability is enhanced.
With a thickness of the ultraviolet shielding resin layer of 6 μm, a negative / positive sheet having a higher definition pattern could be produced.
The ketone resin also includes a cyclic ketone resin, for example, a ketone resin Hilac 222 (trade name, manufactured by Hitachi Chemical Co., Ltd., having a softening point of 100 to 120 ° C. and an acid value of 1 or less). It is preferable to mix the ketone resin at a ratio of 30 to 70% by weight based on the total solid content in the ultraviolet shielding resin layer. If the amount is less than 30% by weight, there is a limit in obtaining a finer pattern.
On the contrary, the hardness of the coating film of the ultraviolet shielding resin layer is too high, and it becomes easy to become brittle. Other than ketone resins, petroleum resins, phenol resins, rosin resins, and the like may be used as long as they have similar functions.

Further, in the present invention, by adding 3 to 20% by weight of polyethylene wax to the total solid content in the ultraviolet ray shielding resin layer, the sliding performance of the ultraviolet ray shielding resin layer surface of the negative / positive sheet can be improved. Thus, the durability can be further improved.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments.

[0011]

Example 1 [Thermoplastic release layer] Carnauba wax dispersion 10.0 (parts by weight) (NV = 30%) Water 45.0 Methyl alcohol 45.0%計 Total 100.0 [UV shielding resin layer] Carbon black dispersed ethylene vinyl acetate resin 7.0 (parts by weight) (ethylene vinyl acetate resin: 3.0 (Carbon black: 4.0) Ketone resin 6.0 Polyethylene wax 1.0 Methyl ethyl ketone 43.0 Toluene 43.0 ─────── Total 100.0

The above-mentioned thermoplastic release agent layer (melting point: 80 ° C.) having a dry film thickness of 2 μm was provided on one side of an untreated polyester film having a thickness of 75 μm by a reverse coating method. A UV-shielding resin layer having a composition having a dry thickness of 4 μm was formed to prepare a negative / positive sheet of the present invention. The ethylene vinyl acetate resin used has a weight average molecular weight of 47000 and a glass transition temperature of -44 ° C., and carbon black has an average particle diameter of 28 μm,
It has an oil absorption of 101 ml / 100 g. Using a peeling ribbon coated on a 4.5 μm-thick polyester film using ethylene vinyl acetate copolymer resin as a heat-sensitive adhesive, a negative-positive sheet was produced using a commercially available thermal transfer printer. A negative or positive film having a tone pattern was obtained.

[0013]

Example 2 The amount of polyethylene wax was fixed in the ultraviolet shielding resin layer in Example 1, and the ratio of ketone resin to carbon black-dispersed ethylene vinyl acetate resin was changed to change the total amount of ketone resin in the ultraviolet shielding resin layer. It carried out similarly to Example 1 using what made the ratio with respect to solid content 30, 40, 50, 60, 70 each weight%.
The evaluation was the same as in Example 1. The results of the evaluation indicate that 30% by weight of the ultraviolet ray shielding resin layer is slightly insufficient in hardness, and that of 70% by weight is slightly too high in hardness of the ultraviolet ray shielding resin layer. Except for the above, all the results were the same as those in Example 1.

[0014]

Example 3 In the ultraviolet shielding resin layer in Example 1, the ratio of ketone resin to carbon black dispersed ethylene vinyl acetate resin was fixed, and the ratio of polyethylene wax to the total solid content in the ultraviolet shielding resin layer was 3, 10 , 17,
It carried out similarly to Example 1 using what was adjusted to 20 weight%. The results of the evaluation indicate that 3% by weight of the UV-shielding resin layer was slightly insufficient in slippage, and that of 20% by weight was that the hardness of the UV-shielding resin layer was slightly insufficient. The results were all the same as in Example 1 except that

[0015]

The sheet of the present invention is used together with a peeling ribbon in a thermal transfer printer to peel off the ultraviolet shielding resin layer only at a certain portion, thereby obtaining a very high definition, high gradation negative or positive sheet. The UV-shielding resin layer had good surface slip and excellent durability.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI G03F 1/00 B41M 5/26 F J

Claims (6)

[Claims] 1. A transparent base material film having at least (A) a transparent thermoplastic release agent layer having a melting point of 40 to 85 ° C. formed on one surface thereof, and (B) the following: A negative / positive production sheet, wherein an ultraviolet shielding resin layer containing the following components is formed and laminated. Dispersion composition of 50 to 60% by weight of carbon black and 40 to 50% by weight of ethylene / vinyl acetate copolymer resin Ketone resin Polyethylene wax 2. The negative / positive sheet according to claim 1, wherein the thickness of the thermoplastic release agent layer is 1 to 4 μm. 3. The ethylene / vinyl acetate copolymer resin has a weight average molecular weight of 40,000 to 60,000, a glass transition temperature of (-40 to -50) ° C., and a vinyl acetate component content of 30 to 50%. The negative / positive production sheet according to claim 1, wherein 4. The ketone resin has a softening point of 100 to 120 ° C. and is 3 to the total solid content in the ultraviolet shielding resin layer.
2. The negative / positive sheet according to claim 1, wherein the sheet is incorporated in an amount of 0 to 70% by weight. 5. A polyethylene wax having a melting point of 90-11.
2. The negative / positive sheet according to claim 1, wherein the temperature is 0 [deg.] C. and the content is 3 to 20% by weight based on the total solid content in the ultraviolet shielding resin layer. 6. The negative / positive sheet according to claim 1, wherein the thickness of the ultraviolet shielding resin layer is 2 to 6 μm.