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Low-shrinkage polyester film and preparation method thereof

A technology of polyester film and polyester, applied in chemical instruments and methods, flat products, other household appliances, etc., can solve the problems of destroying the flatness of the film, film buckling, etc.

Active Publication Date: 2020-07-31
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is well known that thermal relaxation of such membranes leads to buckling of the membrane in the cross-web direction, thereby destroying the desired flattening properties of the membrane.

Method used

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  • Low-shrinkage polyester film and preparation method thereof
  • Low-shrinkage polyester film and preparation method thereof
  • Low-shrinkage polyester film and preparation method thereof

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0022] figure 1 is a schematic diagram of an exemplary embodiment of the method of the present invention comprising the steps of:

[0023] (a) providing a treatment assembly 100 comprising two or more polyester films;

[0024] (b) biaxially orienting 200 the processing assembly; then

[0025] (c) heat setting 300 the treatment assembly; and then

[0026] (d) thermally relaxing 400 the processing component; and

[0027] (e) Optionally detaching the individual polyester layer 500 from the processing assembly.

[0028] The process of the present invention requires the sequential treatment of polyester films at many different temperatures and conditions of dimensional tension or stress. Temperature conditions are referred to herein as the following:

[0029] T g

Glass transition temperature of polyester in polyester film. T 取向

The orientation temperature refers to the temperature of the polyester film during biaxial orientation. T 使用

The use te...

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Abstract

The present invention discloses a method for producing a low shrinkage polyester film, wherein the films are arranged in a stack and are uniformly tentered, heat treated and relaxed. The present invention also discloses polyester films produced by such methods.

Description

technical field [0001] The present invention relates to dimensionally stable oriented polyester films (ie, they exhibit low shrinkage when subjected to high temperatures) and methods of making such films. Background technique [0002] Polyester films are typically oriented to impart desired properties to the film (eg, tendency to undergo heat-induced shrinkage, increased tensile strength, increased impact strength, etc.). Orientation is usually performed by a heating and stretching scheme. The film can be oriented in a single axial dimension, such as in the transverse or machine direction (i.e., uniaxially oriented), or in two typically perpendicular axial dimensions, such as in both the transverse and machine directions (i.e., biaxially oriented). orientation). [0003] Oriented films generally exhibit a tendency to shrink when subjected to significant elevated temperatures. It is known that treating an oriented film with thermal relaxation (ie, heating to a temperature ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29D7/01B29C55/10B32B7/06B32B27/08C08J5/18
CPCB29D7/01B32B7/06B32B27/08B29C55/12B32B25/08B32B25/16B32B27/32B32B27/36B32B2250/24B32B2270/00B32B2307/50B32B2307/518B32B2307/732B32B2307/734B32B2307/736B32B2307/748B32B2307/514B32B2307/30B32B7/035B29C35/045B29C55/005B29C55/023B29C55/14B29C55/16B29C2035/046B29K2067/00B29L2007/008B29L2009/00B32B25/14B32B38/0012
Inventor 约翰·P·珀塞尔詹姆斯·B·什瓦哈斯蒂芬·A·约翰逊蒂莫西·J·林德奎斯特格兰特·F·蒂芬布鲁克查德·R·沃尔德
Owner 3M INNOVATIVE PROPERTIES CO