JPS61102295A - Thermal stencil paper - Google Patents

Abstract

PURPOSE:To solve secondary problems such as scuffing, breaking and delamination of a film due to sticking and prevent adhesion of film dusts or the like, by providing an anti-sticking layer comprising a specified phosphoric acid ester type surfactant on the surface of a polyester. CONSTITUTION:The anti-sticking layer consisting of at least one phosphoric acid ester type surfactant of formula I, II, III, IV or V or a combination of the at least one surfactant and a phosphoric acid ester type surfactant of formula VI is provided on the surface of a polyester film laminated on the porous base to obtain a thermal stencil paper. In the formulas, R is alkyl or alkylphenyl, X is hydrogen or alkali metal, and n (which means the number of moles of ethylene oxide added) is an integer of not smaller than 1, and is ordinarily 1-20 in view of favorable solubility and usability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a heat-sensitive stencil paper in which a stick prevention layer made of a phosphate ester type surfactant is provided on the surface of a polyester film. More specifically, the present invention relates to thermal stencil paper used in digital plate making by thermal head writing perforation.

[Prior art]

Until now, so-called heat-sensitive stencil paper, in which a thermoplastic synthetic resin film is laminated with a porous support such as porous thin paper or screen mesh through which ink can pass, has been irradiated with electromagnetic waves that heat infrared koji by aligning it with the original. In the method of perforating the film, a release layer may be provided on the surface of the film to prevent the perforated film from fusing with the original, making it difficult to remove or damaging the film [4]. has been done. However, in the conventional perforation method, the amount of material deposited on the mold layer (ohno-coat layer) does not greatly affect the perforability of the film depending on the amount of overcoat layer deposited, and It wasn't really a sight to see, as there was almost no problem with the drilling debris in the material.

However, in the film perforation method using thermal head writing, this ? - The type of coating layer material and the amount of coating material greatly affect the drilling performance. For example, if the amount of the thermal head is increased, the performance of the thermal head may be degraded due to decreased perforation or adhesion and accumulation of Ohno-Coat material to the head. Therefore, the solution to this problem lies in how to prevent sticking with a small amount of violet. Therefore, it has been proposed as one means to insert paper between the thermal head and the heat-sensitive stencil paper to form holes (Japanese Patent Laid-Open No. 111855-103
However, it is impossible to perforate the film by this method with the energy (heat capacity, heat conduction, heat diffusion) of the current thermal head. Further, even if it is possible to make holes 1, the resolution will be reduced and the image quality will be poor.

〔the purpose〕

The present invention has been made in view of the above-mentioned current situation, and its purpose is to prevent a polyester film from being exposed to heat by a thermal head during perforation of a heat-sensitive stencil sheet by writing with a thermal head, blocking with the thermal head, To improve the runnability of base paper during punching by eliminating secondary problems such as fuzzing, tearing, and peeling of the film caused by the sticking phenomenon, and to prevent film scum and sticking during punching that is attached to the thermal head. - (Oh-no-coat layer) The purpose of this layer is to improve the running performance of the thermal head by preventing coating substances from forming a layer.

〔composition〕

In order to achieve the above object, the present invention provides a stick prevention layer made of a specific phosphate ester type surfactant on the surface of polyester. That is, according to the present invention, a polyester film is laminated to a porous support, and furthermore, the following formulas I, II, and III are applied to the surface of the film.
, Formula IV or Formula ■, Formula ■ or Formula V, or the following Formula 11 Formula II, Formula III, Formula IV
Alternatively, a stick prevention layer is provided, which is a combination of at least one of the phosphate ester type surfactants represented by formula (1), formula (2), or formula V and a phosphate ester type surfactant represented by the following formula VI. A heat-sensitive stencil paper is provided, characterized in that:

Formula ■ Formula ■ Formula 1 ■ Formula ■ Formula V Formula ■ In each of the above formulas, R represents an alkyl group or an alkylphenyl group, X represents a hydrogen atom or an alkali metal, and n represents the number of moles of ethylene oxide added, and n is 1.
Indicates an integer of 1 to 20, usually ♀1) Those in the circle are easy to use because of their good solubility. Typical examples of the above alkali metals include sodium chloride and potassium.

Such a phosphate ester type surfactant used in the present invention exhibits the effect of preventing gastric sticks even with a very small amount of adhesion, and its adhesion Nf is preferably 0.01 to 0.5 f/m".
．． 05 to 0.3 f/m" is sufficient. In addition, to form a stick prevention layer made of this phosphate ester type surfactant on a polyester film, the surfactant is mixed with a suitable solvent such as water, ethanol, methanol, etc. , dissolved in organic solvents such as ethyl acetate and methyl ethyl ketone,
This can be done by coating the film and drying it.In this case, the concentration of the phosphate ester type surfactant in the solvent is preferably 0.1 to 5 layers, preferably 0.5 to 3! iit
%, and the drying conditions are 70 to 100°C and 10%.
~30 seconds is sufficient.

Used in the present invention. T? The IJ ester film preferably has a thickness of 4μ or less, and porous supports include porous thin paper (tengucho), porous synthetic fiber paper, mixed paper, screens, various woven fabrics, non-woven fabrics, etc. can be used.

Further, the porous support and the polyester film can be bonded together by using a layering agent (for example, by thermal bonding) without using a layer.

〔Example〕

The present invention will be further explained below with reference to Examples, but the present invention is not limited thereto.

A heat-sensitive stencil paper was prepared by laminating a polyester film with a thickness of 2 μm and tengujo paper with a basis weight of 12 f/♂ using vinyl acetate-ethylene copolymer (EVA) resin. In addition, the concentration of the adhesive resin was adjusted so that it was 2 to 3 f/m'', and the wire zN- was applied to the polyester film.
(0.3+mφ) and bonded by wet lamination.

Next, on the film surface of this heat-sensitive stencil paper, an overcoat layer with the contents shown in the following stencil 1 is dried on a dry cloth, and A-
1 to 2)-2 were produced.

Furthermore, in Example 2, the amount of the anti-stick layer deposited was extremely small (0.5 per meter of base paper).
f or less), and in consideration of measurement errors, it was decided to express the adhesion amount of the anti-stick layer using the concentration of the coating liquid -〇-. The diameter of the wire parr used for coating was 0.1 wagφ.

Next, using the heat-sensitive stencil paper created as described above, the heat-sensitive recording facsimile receiver Rifax 5320H (
The perforation performance of each sample was evaluated by performing perforation with a thermal head in copy mode using a printer (manufactured by Ricoh). The results are shown in Table 2 below.

-10=Table 1 In addition, since it is difficult to separate the surfactant odors shown in the products of the present invention, this product contains a small amount of A-1 and B-1 and B-1 as well as C-1. and c-2 samples are It-1 and F! -2 sample Haru. Also,?
-1 and ? Based on the above results for sample 2, it can be seen that the conventional overcoat layer does not have the effect of preventing stickiness when the amount applied is small, but the product of the present invention can sufficiently achieve the purpose with an extremely small amount applied. Recognize. In addition, samples A-1 to B-2 of the present invention were used for infrared ilt!
When perforation was performed using RISOGRAPH Fx72o0 (manufactured by Riko Kagaku T-gyo), which is a perforation method using irradiation, all samples had good original releasability and no problems such as film damage, and sharp perforated images were obtained.

In addition, when the same method as in this example was carried out by changing the type of alkyl group and the number of added moles of oxyethylene in the phosphoric acid ester type surfactant used as a stick-inhibiting agent in the present invention, almost the same results as above were obtained. was gotten.

〔effect〕

According to the heat-sensitive stencil paper of the present invention constructed as described above, the following advantages can be obtained.

(11) Since the phosphate ester type surfactant used in the present invention achieves the stick prevention effect with a very small amount of coating, the overcoat layer material hardly adheres to the thermal head and has good penetration properties.

(2'l stick prevention prevents film fuzz,
No peeling or tearing occurs! Since the drilling quality is good, high-quality images can be obtained.

(3) The running properties of the base paper are smooth and the running properties (perforation 1
1 o'clock) also improved.

(4) Due to the nature of the phosphate ester type surfactant used in the present invention, it has a strong adsorption force (ion adhesion) to the film surface (because of the high oil film strength), and it has a strong adsorption force (ion adhesion) on the film surface (because the oil film strength is high). Quantitative power is small & In.

Therefore, the amount of t that adheres and accumulates is very small.

(51) Since the phosphate ester type surfactant used in the present invention has an antistatic effect, the film after coating is free from dirt, dust, and dust due to static electricity, and the film does not stick, making it easy to process.

Patent Applicant Ricoh Co., Ltd. General Co., Ltd. Procedural Amendment 1980 + 2 Jl/, 30 Director General of the Patent Office Manabu Shiga 1, Indication of Case 1983 Patent Application No. 223848 3, Person Making Amendment Case Relationship Patent applicant address 1-3-6-4 Nakamagome, Ota-ku, Tokyo, 11 sub-agents 3-2 Kojimachi, Chiyoda-ku, Tokyo (mutual building) '5, Date of amendment order (voluntary) 2. Contents of the amendment: "Easy to use in each of the above formulas" in lines 3 to 8 of the 7th Tei is extracted as follows.

[In each of the above formulas, the R group represents an alkyl group -17+4t alkyl phenyl group, and the number of carbon atoms in the surfactant is usually in the range of 8 to 24.

X represents a hydrogen atom or an alkali metal (if X is a hydrogen atom, it is not completely understood as water, but it can be coated)
. n, which means the number of moles of ethylene oxide added, is an integer of 1 or more, and those in the range of 1 to 20 usually have good solubility and are easy to use. However, even if it is larger than this, there is no difference in performance. "that's all

Claims (1)

[Claims] A polyester film is laminated to a porous support, and the following formulas I, II, III, and I are applied to the surface of the film.
V or at least one phosphate ester type surfactant represented by formula V, or the following formula:
I, at least one kind of phosphate ester type surfactant represented by formula II, formula III, formula IV or formula V and the following formula
A heat-sensitive stencil paper, characterized in that it is provided with a stick prevention layer made of a combination of a phosphate ester type surfactant represented by VI. Formula I ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼, Formula II, Formula III ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼, Formula IV ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼, Formula V ▲ Mathematical formulas, chemical formulas, tables, etc. There are ▼, formula VI▲ formula,
Chemical formulas, tables, etc. are available▼ (However, in each of the above formulas, R represents an alkyl group or alkylphenyl group, X represents a hydrogen atom or an alkali metal, and n represents an integer of 1 or more.)