Polymer film

Patent metadata

Field	Value
Publication number	US-2016096938-A1
Application number	US-201414894365-A
Country	US
Kind code	A1
Filing date	May 27, 2014
Priority date	May 27, 2013
Publication date	Apr 7, 2016
Grant date	—

Abstract

There is provided a polymer film which includes a base film layer having an absolute weight average molecular weight of 50,000 to 1,000,000 and an adhesive layer, and a method for manufacturing the polymer film. This film for a tire inner liner can endow an excellent gas barrier property even to tires having a relatively thin thickness so that weight of the tire can be reduced and fuel efficiency of automobiles can be improved. Further, the present film facilitates molding in a tire manufacturing process, and exhibits excellent adhesion force to a carcass layer while having excellent mechanical properties such as high durability and fatigue resistance together with excellent moldability.

First claim

What is claimed is:

1 . A polymer film which comprises: a base film layer comprising a polyamide-based resin; and a copolymer containing a polyamide-based segment and a polyether-based segment; and
an adhesive layer formed on at least one side of the base film layer and containing a resorcinol-formalin-latex (RFL)-based adhesive, wherein the content of the polyether-based segment of the copolymer is more than 2% by weight and less than 15% by weight with respect to the total weight of the base film layer, and wherein the base film layer has an absolute weight average molecular weight of 50,000 to 1,000,000.

2 . The polymer film of claim 1 , wherein a specific refraction increment (dn/dc) of the base film as measured at 40 t using a 1:4 mixed solvent of m-cresol and chloroform containing tetramethylammonium chloride at a concentration of 0.02 M is 0.04 mL/g to 0.14 mL/g.

3 . The polymer film of claim 1 , wherein the polymer film is used for a tire inner liner film.

4 . The polymer film of claim 1 , wherein the base film layer further comprises an olefinic polymer compound.

5 . The polymer film of claim 4 , wherein the olefinic polymer compound includes one or more compounds selected from the group consisting of an olefinic polymer, an olefinic copolymer, and a dicarboxylic acid or its acid anhydride-grafted olefinic polymer or copolymer.

6 . The polymer film of claim 4 , wherein the base film layer includes the olefinic polymer compound in an amount of 0.1% to 40% by weight.

7 . The polymer film of claim 1 , wherein the polyamide-based resin has a relative viscosity with respect to 96% sulfuric acid solution of 3.0 to 3.5.

8 . The polymer film of claim 1 , wherein the copolymer containing polyamide-based segments and polyether-based segments has an absolute weight average molecular weight of 50,000 to 1,000,000.

9 . The polymer film of claim 1 , wherein the copolymer includes the polyamide-based segments and the polyether-based segments in a weight ratio of 1:9 to 9:1.

10 . The polymer film of claim 1 , wherein the polyamide-based resin and the copolymer are included in a weight ratio of 6:4 to 3:7 in the base film layer.

11 . The polymer film of claim 1 ,
wherein the base film layer has a thickness of 30 μm to 300 μm, and the adhesive layer has a thickness of 0.1 μm to 20 μm.

12 . The polymer film of claim 1 , wherein the base film layer is an undrawn film.

13 . The polymer film of claim 1 , wherein the resorcinol-formalin-latex (RFL)-based adhesive includes 2% to 30% by weight of a condensate of resorcinol and formaldehyde and 68% to 98% by weight of a latex.

Assignees

• Kolon Inc

Inventors

• Jeong Young-Han
• Kwon So-Yeon
• Namgoong Hyun
• Kim Seong-Hun

Classifications

• C09J2471/006

  in the substrate · CPC title

• C09J2477/006

  in the substrate · CPC title

• B60C1/0008 Primary

  Compositions of the inner liner · CPC title

• C09J161/12

  with polyhydric phenols · CPC title

• C08J2477/02

  Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08J2477/10 takes precedence) · CPC title