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Biaxially oriented polyester film and method for producing same

A polyester film, biaxially oriented technology, applied in chemical instruments and methods, sustainable manufacturing/processing, transportation and packaging, etc., can solve the problems of poor film handling, poor sliding properties, scratches, etc., and achieve excellent Excellent mechanical properties, excellent printing appearance, and excellent secondary processing suitability

Pending Publication Date: 2021-06-15
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, polyesters for films have problems in that when the film surface is smooth, wrinkling occurs when the produced film is wound up into a roll, or when the film is stacked, the film adheres to each other, causing so-called blocking, or processing. When the film is rolled into a roll, defects such as scratches occur due to poor sliding properties with guide rollers, etc., and the handling properties of the film deteriorate
[0015] However, there is still a problem of causing print through, etc.

Method used

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  • Biaxially oriented polyester film and method for producing same
  • Biaxially oriented polyester film and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0231] As a raw material, the surface layer (A) is made of polyethylene terephthalate resin 1 / polyethylene terephthalate resin 1 containing inorganic particles / polyethylene terephthalate resin containing additives. Diformic acid ester resin 1 = 76.5 / 12.5 / 11.0 (mass %) is mixed, the base layer (B) is used to become polyethylene terephthalate resin 1 / contains What mixed the polyethylene terephthalate resin 1 of inorganic particles / the polyethylene terephthalate resin 1 containing an additive=84.1 / 4.9 / 11.0 (mass %). Using two melt extruders, for each raw material resin, the surface layer (A) is melt-extruded from the first extruder to form a mixed resin at a resin temperature of 285°C, and the base layer is melt-extruded from the second extruder. (B) Forming a mixed resin Melt extrusion was performed at a resin temperature of 285°C. Each extruder uses a filter that captures 95% or more of foreign matter of 25 μm or more. From the contact side of the cooling roll, in the o...

Embodiment 2

[0236]As a raw material, the surface layer (A) is made of polyethylene terephthalate resin 1 / polyethylene terephthalate resin 1 containing inorganic particles / polyethylene terephthalate resin containing additives. A biaxially oriented polyester film having a film thickness of 12 μm was obtained in the same manner as in Example 1 except that ethylene glycol diformate resin 1=80.7 / 8.3 / 11.0 (mass %) was mixed. Evaluation was performed in the same manner as in Example 1.

Embodiment 3

[0238] As a raw material, the surface layer (A) is made of polyethylene terephthalate resin 1 / polyethylene terephthalate resin 1 containing inorganic particles / polyethylene terephthalate resin containing additives. A biaxially oriented polyester film having a film thickness of 12 μm was obtained in the same manner as in Example 1 except that ethylene glycol diformate resin 1=72.3 / 16.7 / 11.0 (mass %) was mixed. Evaluation was performed in the same manner as in Example 1.

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Abstract

The present invention provides: a biaxially oriented polyester film which has excellent mechanical properties, transparency and heat resistance, while being excellent in terms of secondary processing adequacy and print appearance; and a method for producing this biaxially oriented polyester film. A biaxially oriented polyester film which is configured such that: at least one film surface satisfies the requirements (1) and (2) described below; and the film satisfies the requirements (3) and (4) described below. (1) The maximum profile peak height (SRp) is 1.2-1.6 [mu]m. (2) The arithmetic mean roughness (SRa) is 0.024-0.045 [mu]m. (3) The tensile strengths in the longitudinal direction and in the width direction are 180-300 MPa. (4) The haze is 7% or less.

Description

technical field [0001] The present invention relates to a biaxially oriented polyester film. More specifically, it relates to a biaxially oriented polyester film which has excellent mechanical properties, transparency, and heat resistance, and is excellent in secondary processing suitability and printing appearance. Background technique [0002] Polyester resins such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), which are thermoplastic resins with excellent heat resistance and mechanical properties, are used in plastic films, electronic products, energy, It is used in a very wide range of fields such as packaging materials and automobiles. Among plastic films, biaxially stretched PET films have excellent balance between mechanical properties, strength, heat resistance, dimensional stability, chemical resistance, optical properties, etc., and cost, so they are widely used in industrial and packaging fields. being widely used. [0003] In the fiel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18B29C48/08B29C48/16B29C55/14B32B7/022B32B7/023B32B27/20B32B27/36C08J3/22
CPCB29C48/08B29C55/14C08J5/18B32B2307/7242B32B2250/02B32B2264/104B32B2307/412B32B2307/54B32B27/18B32B2264/101B32B2250/04B32B2307/518B32B2439/70B32B27/36B32B2264/12B32B2307/538B32B2272/00B32B2264/0214B32B2264/102B32B2307/306B32B2250/244B32B2264/10B32B27/08B32B2250/03B29C48/0018B29C48/91C08J2367/02C08J2467/02C08L67/02C08K3/36B29C48/16B32B27/20B29C2948/92704B29C55/143B29K2067/003B29K2995/0053B29L2031/3475B29L2031/712C08K2201/002
Inventor 中野麻洋春田雅幸
Owner TOYOBO CO LTD