US 2010/0136354 A1Published application

Method for production of stretched multilayer film

AssigneeThe Nippon Synthetic Chemical Industry Co., Ltd.

InventorsMasahiko Taniguchi, Hideshi Onishi, Takamichi Tanabe

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Abstract

The present invention discloses a method for production of a stretched multilayer film obtained by stretching a multilayer structure comprising a layer containing (A) side chain 1,2-diol-modified vinyl alcohol-based resin and a layer containing (B) thermoplastic resin having a melting point of 125 to 300° C. laminated on each other through a layer of (C) adhesive resin. The method enables to produce a stretched multilayer film which shows excellent appearance even when the film is stretched at a high stretching magnitude. In the method, the (C) adhesive resin employs a thermoplastic resin having a melting point higher than the stretching temperature of the multilayer film, and therefore, a stretched multilayer film having the above-mentioned structure and having excellent appearance can be produced.

Claims20

Dependent claims

A method for production of a stretched multilayer film comprising at least mono-axially stretching a multilayer structure under heating, wherein the multilayer structure comprises

a layer containing (A) vinyl alcohol-based resin having 1,2-diol unit in a side chain thereof represented by formula (1);
a layer laminated on at least one side of the layer containing the (A) vinyl alcohol-based resin, and containing (B) thermoplastic resin having a melting point of 125 to 300° C.;
and
a layer of (C) adhesive resin intervened between the layer containing (A) vinyl alcohol-based resin and the layer containing (B) thermoplastic resin,
wherein the (C) adhesive resin has a melting point higher than the stretching temperature of the multilayer structure,
and wherein each of R1 to R6 independently represents hydrogen atom or an organic group, and X represents a single bond or binding chain.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/598,634Filed 23 Apr 2008
Priority: JP 2007-12668211 May 2007
Published: 3 Jun 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification21 codes

B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
B29C 55/005
Shaping by stretching, e.g. drawing through a die; Apparatus therefor: characterised by the choice of materials
B29C 55/023
Of plates or sheets: using multilayered plates or sheets
B32B 7/12
Interconnection of layers: using interposed adhesives or interposed materials with bonding properties