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Multilayered 4-methyl-1 pentene copolymer film and process for producing the same

A technology of pentene copolymer and multi-layer film, applied in the field of 4-methyl-1-pentene copolymer multi-layer film and its preparation, can solve the problems of low production efficiency, poor release, fracture and the like

Inactive Publication Date: 2003-01-22
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the 4-methyl-1-pentene copolymer film is prone to stretch non-uniformity or breakage during the uniaxial stretching process, and the production efficiency is low.
Also, films made by monostretching 4-methyl-1-pentene copolymer films sometimes have poor releasability from the surface of uncoated copper oxide foils

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0172] A three-layer type unstretched film of two materials was prepared by using a T-die extrusion molding machine, and the structure of this film was 4-methyl-1-pentene copolymer (1) / polypropylene (b1) / 4-methyl-1-pentene copolymer (1) (thickness of each layer = 60 / 80 / 60 microns). Stretchability of this unstretched film was examined.

[0173] Then, this three-layer unstretched film of two materials was uniaxially stretched at a stretch ratio of 4 to obtain 4-methyl-1-pentene copolymer (1) / polypropylene (b1) / 4 - Stretched film of methyl-1-pentene copolymer (1) (thickness of each layer = 15 / 20 / 15 microns).

[0174] By cutting the unstretched film into a 5 cm long and 5 cm square sample for stretching, the uniaxial stretching of the sample is carried out at a temperature of 180° C. for 5 minutes at a stretch ratio of 4 (the following examples 2-8 and the comparative example were subjected to the same stretching).

[0175] The released and rigidity of the thus obtained stretc...

Embodiment 2

[0182] A three-layer type unstretched film of two materials was prepared by using a T-die extrusion molding machine, and the structure of this film was 4-methyl-1-pentene copolymer (3) / polypropylene (b1) / Poly-4-methyl-1-pentene copolymer (3) (thickness of each layer = 60 / 80 / 60 microns). Stretchability of this unstretched film was examined.

[0183] Then, this three-layer unstretched film of two materials was uniaxially stretched at a stretch ratio of 4 to obtain 4-methyl-1-pentene copolymer (3) / polypropylene (b1) / 4 - Stretched film of methyl-1-pentene copolymer (3) (thickness of each layer = 15 / 20 / 15 microns). The released and rigidity of the thus obtained stretched film were examined. The results are shown in Table 1.

Embodiment 3

[0185] A five-layer unstretched film of three materials was prepared by using a T-die extrusion molding machine, and the structure of this film was 4-methyl-1-pentene copolymer (1) / binder resin (c ) / polypropylene (b1) / binder resin (c) / 4-methyl-1-pentene copolymer (1) (thickness of each layer = 40 / 20 / 80 / 20 / 40 µm). Stretchability of this unstretched film was examined.

[0186] Then, the five-layer unstretched film of these three materials is uniaxially stretched at a draw ratio of 4 to obtain 4-methyl-1-pentene copolymer (1) / binder resin (c) Stretched film of / polypropylene (b1) / binder resin (c) / 4-methyl-1-pentene copolymer (1) (thickness of each layer = 10 / 5 / 20 / 5 / 10 microns ). The released and rigidity of the thus obtained stretched film were examined. The results are shown in Table 1.

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Abstract

A multilayered 4-methyl-1-pentene copolymer film which is a laminate comprising layers (A) made of a 4-methyl-1-pentene copolymer and a layer (B) made of polypropylene or polyethylene and optionally further having one or more layers (C) made of an adhesive resin, the layers (A) being disposed respectively on both sides of the layer (B) optionally through the layers (C), the film having been monoaxially stretched at least 2 times or having been biaxially stretched at least 1.5 times in each of the machine and transverse directions. The multilayered film has satisfactory stretchability in production, has high rigidity, and has satisfactory releasability from blackened copper foils. It is suitable for use as a release film for MLB production.

Description

technical field [0001] The invention relates to a 4-methyl-1-pentene copolymer multilayer film and a preparation method thereof. More specifically, the present invention relates to a 4-methyl-1-pentene copolymer multilayer film useful as, for example, a release film and a method for preparing the same. Background technique [0002] As we all know, in recent years, the integration level of IC has been increasing with the rapid development of electronic equipment. With the improvement of integration level, in order to meet the requirements of high precision, high precision and high reliability, a large number of printed circuit boards are used. [0003] Printed circuit boards include single-sided printed circuit boards, double-sided printed circuit boards, multilayer printed circuit boards, and flexible printed circuit boards. Among the above-mentioned printed circuit boards, the field of application of multilayer printed circuit boards (hereinafter referred to as "MLB") is i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B33/00H05K3/46
CPCB32B2457/08H05K3/4611B32B2038/0028B32B27/32B32B2307/748B32B33/00Y10T428/31913B32B7/12B32B27/08B32B2323/04B32B2323/10
Inventor 中原隆伊牟田伸一重本博美
Owner MITSUI CHEM INC
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