JPH0461799B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field] The present invention relates to a heat-sensitive stencil paper having a stick prevention layer made of a phosphate ester type surfactant provided on the surface of a polyester film. For more details,
The present invention relates to thermal stencil paper used in digital plate making using thermal head writing and perforation. [Prior Art] Until now, so-called heat-sensitive stencil paper, in which a thermoplastic synthetic resin film is laminated to a porous support such as porous thin paper or screen mesh through which ink can pass, has been superimposed on a manuscript and irradiated with electromagnetic waves including infrared rays. In the method of perforating a film by punching, it has been proposed to provide a release layer on the surface of the film in order to prevent the perforated film from fusing with the original, making it difficult to remove or damaging the film. ing. However, in the conventional perforation method, the amount of the release layer (overcoat layer) material deposited does not significantly affect the perforability of the film depending on the amount of the overcoat layer deposited. Since the drilling debris caused almost no problems, it was not very important. However, in the film perforation method using thermal head writing, the type of overcoat layer material and the amount of the overcoat layer material greatly affect the perforation performance. For example, if the amount of deposit is too high, the perforability will be reduced and the overcoat material will adhere to and accumulate on the head, resulting in problems that reduce the performance of the thermal head. Therefore, the solution to this problem lies in how to prevent sticking with a small amount of adhesion. Therefore, as a method, it has been proposed to insert paper between the thermal head and the heat-sensitive stencil atoms to form holes (Japanese Patent Application Laid-Open No. 1982-1992).
However, it is impossible to perforate the film using this method with the energy (heat capacity, heat conduction, heat diffusion) of current thermal heads. Furthermore, even if holes can be formed, the resolution will be reduced and the image quality will be poor. [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 thermally fused to a thermal head during perforation of thermal stencil paper by thermal head writing, and to To improve the runnability of base paper during perforation by eliminating secondary problems such as fuzzing, tearing, and peeling of the film that occur due to the blocking and stabking phenomenon, and to eliminate film scum during perforation that adheres to the thermal head and The purpose of the anti-stick layer (overcoat layer) is to prevent coating substances from adhering to the thermal head, thereby improving the running properties of the thermal head. [Structure] In order to achieve the above object, the present invention is to provide an anti-stick 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, at least one of the phosphate ester type surfactants represented by the following formula I, formula, formula, formula, or formula is applied to the surface of the film. consisting of one type or the following formula I,
It is characterized by providing a stick prevention layer consisting of a combination of at least one type of phosphate ester type surfactant represented by the formula, formula, formula, or formula and a phosphate ester type surfactant represented by the following formula. A heat-sensitive stencil paper is provided.

【formula】

【formula】

【formula】

〔Example〕

The present invention will be further explained below with reference to Examples, but the present invention is not limited thereto. 2μ thick polyester film and basis weight 12g/m ²
Tengucho paper was laminated with vinyl acetate-ethylene copolymer (EVA) resin to create heat-sensitive stencil paper. In addition, the adhesive resin adhesion amount is 2 to 3 g/m ²
The concentration was adjusted so that the film was coated with a polyester film wire bar (0.3 mmφ) and laminated by wet lamination. Next, an overcoat layer having the contents shown in Table 1 below was coated on the film surface of this heat-sensitive stencil paper and dried to prepare each product A-1 to G-2 shown in Table 1. Furthermore, in this example, the amount of the anti-stick layer deposited is extremely small (1 m ² of base paper).
(0.5g or less), and in consideration of measurement errors, the amount of the stick prevention layer adhered is expressed in Table 1 using the concentration of the coating solution. The diameter of the wire bar used for coating was 0.1 mmφ. Next, using the thermal stencil paper prepared as described above, perforation was performed with a thermal head in copy mode using a thermal recording facsimile receiver RIFAX 5320H (manufactured by Ricoh), and the perforation performance of each sample was evaluated. The results are shown in Table 2 below.

【table】

[Table] In addition, in the surfactants shown in the above-mentioned products of the present invention,

Diester type of [formula] and

Since it is difficult to completely separate from the monoester type of [Formula], A-
Samples 1 and A-2 are

[Formula] is also slightly included, and similarly, samples B-1 and B-2 are

[Formula] and samples of C-1 and C-2 are

[Formula] is also D-1 and The sample of D-2 is

[Formula] and the samples of E-1 and E-2 are

It also contains some [formula]. Ru.

【table】

〔effect〕

According to the heat-sensitive stencil paper of the present invention constructed as described above, the following advantages can be obtained. (1) The phosphate ester type surfactant used in the present invention achieves the stick prevention effect with a very small amount of coating, so the overcoat layer material hardly adheres to the thermal head and has good perforation properties. (2) Due to the stick prevention, phenomena such as fuzzing, peeling, and tearing of the film do not occur, and the perforation quality is good, so high-quality images can be obtained. (3) The running performance of the base paper has become smoother and the running performance (during punching) has also been improved. (4) Due to the properties of the phosphate ester type surfactant used in the present invention, it has a strong adsorption power (ion adsorption) on the film surface (due to the high oil film strength), and the amount that is scraped off by the thermal head is small, so it does not adhere or adhere. The amount deposited is also very small. (5) Since the phosphate ester type surfactant used in the present invention has an antistatic effect, the coated film is free from dirt, dust, and dust due to static electricity, and the film is easy to process without adhesion.

Claims (1)

[Scope of Claims] 1. A polyester film is laminated to a porous support, and at least one of the phosphate ester type surfactants represented by the following formula I, formula, formula, formula, or formula is applied to the surface of the film. A combination of at least one phosphate ester type surfactant consisting of one type or represented by the following formula I, formula, formula, formula or formula and a phosphate ester type surfactant represented by the following formula Heat-sensitive stencil paper characterized by being provided with a stick prevention layer. [Formula] [Formula] [Formula] [Formula] (However, in each of the above formulas, R represents a C ₈ to C ₂₄ alkyl group, X represents a hydrogen atom or an alkali metal, and l, m, and n each represent 1 ~ indicates a number of 10).