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Multilayer polyester film and method for producing same

A multi-layer film and polyester technology, applied in the direction of chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve problems such as management and production difficulties, lower yield, lower production yield, etc., to achieve reduction Small sag, low shrinkage, excellent coating process

Active Publication Date: 2019-05-21
KOLON IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] When only the central part is used, the edge part needs to be cut and discarded, so the yield of the product is reduced. When the edge parts are laminated and used, since the physical properties of each edge part are different, it is necessary to measure the orientation angle for lamination, etc. Inspection process, so there are difficulties in management and production, and it also reduces production yield

Method used

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  • Multilayer polyester film and method for producing same
  • Multilayer polyester film and method for producing same
  • Multilayer polyester film and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0159] The core layer uses polyethylene terephthalate (PET) with an intrinsic viscosity of 0.65dl / g, and the surface layer uses PET with an intrinsic viscosity of 0.64dl / g and 70ppm of silica particles with an average particle size of 2.5μm. Coextrusion is performed separately to coextrude a three-layer film laminated with skin layer / core layer / skin layer, followed by casting on a cooling roll to produce an unstretched sheet. At this time, the core layer accounts for 80% by weight of the total film weight, and the surface layer accounts for 20% by weight of the total film weight. Sequentially stretched 3 times along the machine direction, 3.4 times along the width direction, and heat-treated at 210 ° C, as shown in Table 1, a total of 3.5% relaxation in the four regions, in the first region, The second region, the third region, and the fourth region were given relaxation rate gradients of 1.2%, 1.0%, 0.9%, and 0.8%, respectively, thereby manufacturing a film with a total thick...

Embodiment 2、3

[0162] As shown in Table 1 below, a film was produced in the same manner as in Example 1 except that the relaxation rate in the width direction was changed.

[0163] The physical properties of the produced films were measured and shown in Tables 2 and 3 below.

Embodiment 4、5

[0165] As shown in Table 1 below, a film was produced in the same manner as in Example 1, except that the intrinsic viscosity of the surface layer material and the relaxation rate in the width direction were changed.

[0166] The physical properties of the produced films were measured and shown in Tables 2 and 3 below.

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Abstract

The present invention relates to an optical multilayer polyester film having high transparency and excellent surface property, and a method for producing the same and, specifically, to a multilayer polyester film and a method for producing the same, wherein the multilayer polyester film has a low shrinkage ratio and has a small difference in the shrinkage ratio between a center portion and an edgeportion of a wide film having a total width of 5000 mm or larger, so as to reduce a bowing phenomenon and a baggy phenomenon, which may occur in a post-treatment process.

Description

technical field [0001] The present invention relates to an optical polyester multilayer film with high transparency and excellent surface properties and its manufacturing method. Specifically, it relates to a wide film with a low shrinkage rate and a full width of 5,000 mm or more. A polyester multilayer film and a method for producing the same because the difference in the shrinkage rate of the parts is small, thereby improving the bending phenomenon, and reducing the baggy phenomenon that occurs in subsequent processing steps such as prism coating and diffusion coating. Background technique [0002] Optical films are used as optical components for displays, as optical materials for LCD BLUs, or as optical components for surface protection of various displays such as LCDs, PDPs, and touch panels. [0003] In order to make such an optical film suitable for applications such as touch panels or mobile phones, it is important to improve the quality of the film to exhibit approp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/36B32B27/20B32B7/023B32B7/028B29C48/00B29C55/12
CPCB32B7/02B32B27/08B32B27/20B32B27/36B29C55/12B29C48/00B29C48/0018
Inventor 曹铉
Owner KOLON IND INC
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