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Polyester film for high sensitive thermal mimeorgraph stencil paper

A stencil printing, high-sensitivity technology, applied in printing, printing process, printing foil, etc., can solve the problem of poor sharpness and other problems

Inactive Publication Date: 2006-01-04
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, if the film around the perforated area is deformed, or the perforated area is raised, the sharpness of a fine image like a photo image will be deteriorated.
[0007] Conventionally, a film used for such an application is a biaxially stretched film for thermoplastic resins, and a film for improving printing characteristics by specifying its thermal characteristics has been proposed (Japanese Unexamined Patent Publication No. 62-149496 ), specifying the average particle diameter A film with the same film thickness (JP-A-63-286396), a film with a specified surface roughness and the number of protrusions (JP-A-63-227634), or a film with specified heat shrinkage properties (JP-A-62- 282983 communique, JP-A-63-160895, JP-63-312192, JP-3-30996), etc., but cannot solve all the above-mentioned problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] Evenly blend polyester A: 15 parts by weight, polyester C: 35 parts by weight and polyester D: 50 parts by weight, melt and knead with a twin-screw extruder at 265°C, and extrude in sheet form. The rotating cooling drum set at 30° C. was quenched and solidified by applying an electrostatic cooling method to obtain a substantially amorphous sheet with a thickness of 24 μm. The obtained sheet was stretched 4.0 times in the longitudinal direction at 75°C and 4.0 times in the transverse direction at 85°C, and then heat-treated at 95°C for 6 seconds while relaxing by 2.0%, to obtain a biaxially oriented film with a thickness of 1.5 μm. Next, according to the usual method, the obtained film was bonded to porous thin paper to prepare a base paper for heat-sensitive stencil printing, and transcription printing was performed.

Embodiment 2

[0093] In Example 1, except that the polyester raw material is mixed according to polyester A: 20 parts by weight, polyester C: 40 parts by weight, ester D: 40 parts by weight, stretched to 4.5 times in the longitudinal direction and 4.3 times in the transverse direction. After doubling, heat treatment was performed at 105°C for 6 seconds while relaxing 7% in the lateral direction, and the film was formed in the same manner as in Example 1 to produce a heat-sensitive stencil printing base paper for transcription printing.

Embodiment 3

[0095] In Example 1, except that the polyester raw material was blended according to polyester A: 20 parts by weight, polyester B: 30 parts by weight, and polyester C: 50 parts by weight, the film was made in the same way as in Example 1 to produce Thermal stencil printing base paper for transcription printing.

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Abstract

A highly sensitive thermosensitive polyester film for porous printing base paper which is a biaxially oriented polyester film of 1.0 to 7.0 mum thickness comprising a composition of three or more types of polyesters, the polyester film having a Young's modulus of 3000 Mpa or greater and exhibiting a primary dispersion temperature E''(t) of dynamic viscoelasticity temperature characteristics, measured by the dynamic viscoelasticity method, of 60 to 75 C. This film is excellent in perforation sensitivity and realizes enhanced resolution at printing, plate making strain and plate wear resistance.

Description

technical field [0001] The present invention relates to a polyester film for heat-sensitive stencil printing base paper. More specifically, the present invention relates to a polyester composition composed of three or more types, which maintains high heat resistance, mechanical properties, and shrinkage properties, and is excellent in perforation sensitivity, curl resistance, printing resistance, and movement resistance, and has excellent image quality. High-sensitivity, high-quality thermal stencil printing base paper film with excellent image resolution and vividness. Background technique [0002] Conventionally, as a base paper for thermal stencil printing, a thermal stencil base paper in which ink permeable porous thin paper is bonded to a thermoplastic resin film such as polyester with an adhesive is known. However, in the conventional heat-sensitive stencil base paper, the adhesive tends to stagnate at the part where the fiber overlaps and the film is in contact, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41N1/24B29C55/12B29K67/00C08J5/18C08L67/02
CPCB41N1/243C08J2367/02C08L67/02C08J5/18C08L2666/18B41N1/24
Inventor 三桥胜三久保田弘二
Owner MITSUBISHI CHEM CORP
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