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Multilayer polyester film

A technology of polyester film and laminated film, which is applied in the field of laminated polyester film, can solve problems such as printing defects, insufficient heat resistance, and deformation of printed matter, and achieve excellent formability, excellent resistance to embrittlement over time, Excellent printing effect

Active Publication Date: 2010-10-27
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As a molding film used for molding applications such as transfer foils, biaxially stretched polyester films are currently used (for example, see Patent Document 1 and Patent Document 2). For example, in the case of transfer foil, transfer to a member with a large drawing ratio or a member with a complicated shape is not sufficient in formability
[0003] In addition, as a polyester film for the purpose of improving formability, a transfer foil using a copolyester film having a lower forming stress than a biaxially stretched polyester film is disclosed (for example, see Patent Document 3); Specific diol components such as diols are polyester films used for molding, processing, printing products, etc. The formability is good, but the printability is not particularly considered, and there are problems of easy whitening due to organic solvents such as ethyl acetate, methyl ethyl ketone, toluene, acetone, etc. contained in the printing ink, transparency, film surface Deterioration of smoothness, prone to printing defects, etc.
However, compared with the biaxially stretched film, the polyester unstretched film has the following problem because the molecules are not fixed due to stretching and heat treatment. Wrinkles, stretching, shrinkage and other deformations are likely to occur on the surface, and when it is transferred to a molded product, the printed material is deformed and becomes the cause of poor molding, and the heat resistance at 80 to 120°C is not sufficient
Specifically, the elongation at break of the film immediately after production is several hundred percent, but the elongation at break becomes several percent after the passage of time, and when various processes such as slit are performed, damage, breakage, etc. are likely to occur. , poor operability

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0182]As the polyester (A) of the polyester (A) layer, the particles (100% by mass) of the copolyester 2 were used, and the extrusion temperature was set at 230° C. In the exhaust port 2, L / D=70), as the polyester (B) of the polyester (B) layer, pellets of PBT (98% by mass) and pellets of MS-2 pellets (2% by mass) were used ) into a vented counter-rotating twin-screw extruder B (2 vent ports, L / D=70) with an extrusion temperature set at 260°C, passing through layer B / layer A / layer B The 3-layer Pinole is introduced into the T-die tube head with a slit gap of 0.8mm set at 260°C and extruded in the form of a film. Static electricity will be applied to both ends of the extruded sheet using a needle-shaped edge positioning device The method and the air cavity method are used together to make it close to the dark surface casting drum (center line surface roughness Ra=200~350nm) with a surface temperature of 60°C, and then cool and solidify to produce a thickness of 40μm (B layer / A ...

Embodiment 2

[0184] As the polyester (A) of the polyester (A) layer, particles (100% by mass) of copolyester 6 were used, and in the same manner as in Example 1, a thickness of 50 μm (layer B / layer A / layer B) was produced. Laminated polyester film of thickness = 10 μm / 30 μm / 10 μm).

Embodiment 3

[0186] As the polyester (A) of the polyester (A) layer, particles (100% by mass) of copolyester 3 were used, and in the same manner as in Example 1, a thickness of 25 μm (layer B / layer A / layer B) was produced. Laminated polyester film of thickness = 5 μm / 15 μm / 5 μm).

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Abstract

isclosed is a multilayer polyester film having satisfactory flexibility, solvent resistance, printability, heat resistance, formability and embrittlement resistance over time, while exhibiting excellent cost performance. Specifically disclosed is a multilayer polyester film which is characterized in that a polyester (B) layer mainly composed of a polyester (B) is arranged on at least one side of a polyester (A) layer mainly composed of a polyester (A). The multilayer polyester film is also characterized by having an elastic modulus of 20-1000 MPa in an atmosphere at 23 DEG C and an elastic modulus of 10-200 MPa in an atmosphere at 120 DEG C, and having substantially no orientation.

Description

technical field [0001] The present invention relates to a laminated polyester film excellent in flexibility, heat resistance, solvent resistance, printability, moldability, and aging resistance to embrittlement. Background technique [0002] As a molding film used for molding applications such as transfer foils, biaxially stretched polyester films are currently used (for example, see Patent Document 1 and Patent Document 2). For example, in a transfer foil application, transfer to a member having a large drawing ratio or a member having a complicated shape is insufficient in formability. [0003] In addition, as a polyester film for the purpose of improving formability, a transfer foil using a copolyester film having a lower forming stress than a biaxially stretched polyester film is disclosed (for example, see Patent Document 3); Specific diol components such as diols are polyester films used for molding, processing, printing products, etc. The formability is good, but th...

Claims

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Application Information

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IPC IPC(8): B32B27/36C08G63/181
CPCB32B27/36B32B27/08B32B27/16B32B2250/244B32B2255/10B32B2255/26B32B2307/306B32B2307/40B32B2307/51B32B2307/546B32B2307/714B32B2307/75B32B2419/00B32B2439/00B32B2457/00B32B2553/00B32B2605/08Y10T428/24942Y10T428/2495Y10T428/31786
Inventor 新沼馆浩桥本幸吉木村将弘仲村博门
Owner TORAY IND INC
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