Polymer film and polymer film manufacturing method

Patent metadata

Field	Value
Publication number	US-2017313832-A1
Application number	US-201515515713-A
Country	US
Kind code	A1
Filing date	Sep 30, 2015
Priority date	Sep 30, 2014
Publication date	Nov 2, 2017
Grant date	—

Abstract

The present invention relates to a polymer film comprising a base film comprising polyamide-based resin; and two or more kinds of copolymers comprising polyamide-based segments and polyether-based segments, and a method for preparing the polymer film.

First claim

1 . A polymer film for an inner liner, comprising a base film comprising: polyamide-based resin; and two or more kinds of copolymers comprising polyamide-based segments and polyether-based segments.

2 . The polymer film according to claim 1 , wherein the two or more kinds of copolymers include copolymer comprising different polyether-based segments.

3 . The polymer film according to claim 1 ,
wherein at least one kind of copolymer comprises polyether-segments comprising repeat units of the following Chemical Formula 31 among the copolymers:

4 . The polymer film according to claim 3 ,
wherein another kind of copolymer comprises polyether-based segments comprising repeat units of the following Chemical Formula 32 among the copolymers:

5 . The polymer film according to claim 4 ,
wherein the weight ratio of one kind of copolymer comprising polyether-based segments comprising repeat units of the Chemical Formula 31 and polyamide-based segments and another kind of copolymer comprising polyether-based segments comprising repeat units of the Chemical Formula 32 and polyamide-based segments, is 1:1 to 1:5.

6 . The polymer film according to claim 1 ,
wherein the total content of the polyether-based segments included in the base film is 2 wt % to 40 wt %.

7 . The polymer film according to claim 1 ,
wherein the base film further comprises an olefin-based polymer compound.

8 . The polymer film according to claim 7 ,
wherein the olefin-based polymer compound comprises one or more compounds selected form the group consisting of olefin-based polymer, olefin-based copolymer and olefin-based polymer or copolymer grafted with dicarboxylic acid or acid anhydride thereof.

9 . The polymer film according to claim 7 ,
wherein the base film comprises 0.1 wt % to 30 wt % of the olefin-based polymer compound.

10 . The polymer film according to claim 1 ,
wherein the thickness of the base film is 30 to 300 μm, and oxygen permeability measured at 25° C. and 60RH % according to the method of ASTM D 1434 is 200 cm 3 /(m 2 ×24 hr×atm) or less.

11 . The polymer film according to claim 1 ,
wherein heat-resistant impact strength toward the transverse direction (TD) of the base film, measured after heat treating the base film at 170° C. for 1 hour according to ISO 8256 Method A, is 800 to 4,000 kJ/m 2 .

12 . The polymer film according to claim 11 ,
wherein the ratio of heat-resistant impact strength toward the machine direction (MD) of the base film to heat-resistant impact strength toward the transverse direction (TD) of the base film, measured after heat treating the base film at 170° C. for 1 hour according to ISO 8256 Method A, is 1 to 3.

13 . The polymer film according to claim 1 ,
further comprising an adhesive layer with a thickness of 0.1 μm to 20 μm, formed on at least one side of the base film, and comprising resorcinol-formalin-latex (RFL)-based adhesive.

14 . A method for preparing a polymer film for an inner liner, comprising the step of melting a mixture comprising polyamide-based resin; and two or more kinds of copolymers comprising polyamide-based segments and polyether-based segments at 200 to 300° C. and extruding it to form a base film.

15 . The method for preparing a polymer film according to claim 14 ,
wherein the two or more kinds of copolymers include different polyether-based segments.

16 . The method for preparing a polymer film according to claim 14 ,
wherein at least one kind of copolymer comprises polyether-segments comprising repeat units of the following Chemical Formula 31 among the copolymers:

17 . The method for preparing a polymer film according to claim 16 ,
wherein another kind of copolymer comprises polyether-based segments comprising repeat units of the following Chemical Formula 32 among the copolymers:

18 . The method for preparing a polymer film according to claim 17 ,
wherein the total content of the polyether-based segments included in the mixture is 2 wt % to 40 wt %.

19 . The method for preparing a polymer film according to claim 14 ,
wherein the mixture further comprises an olefin-based polymer compound.

20 . The method for preparing a polymer film according to claim 14 ,
comprising the step of forming an adhesive layer comprising resorcinol-formalin-latex (RFL)-based adhesive on at least one side of the base film.

Assignees

• Kolon Inc

Inventors

• Kim Yun-Jo

Classifications

• C08J5/18 Primary

  Manufacture of films or sheets · CPC title

• C08J2377/02

  Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08J2377/10 takes precedence) · CPC title

• C08L77/00 Primary

  Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain (of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08); Compositions of derivatives of such polymers · CPC title

• C08G69/40

  Polyamides containing oxygen in the form of ether groups (C08G69/12, C08G69/32 take precedence) · CPC title

• C09J161/12

  with polyhydric phenols · CPC title