Polymer films

Patent metadata

Field	Value
Publication number	US-10005891-B2
Application number	US-201414894365-A
Country	US
Kind code	B2
Filing date	May 27, 2014
Priority date	May 27, 2013
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

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; an olefinic polymer compound; 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, and
the olefinic polymer compound includes a dicarboxylic acid or its acid anhydride-grafted olefinic polymer or copolymer,
wherein the polyamide-based resin, the copolymer, and the olefinic polymer compound, respectively are included in a weight ratio of 2:2:1 to 2:3:1 in the base film layer.

2. The polymer film of claim 1 , wherein a specific refraction increment (dn/dc) of the base film as measured at 40° C. 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 grafted dicarboxylic acid or its acid anhydride is contained in an amount of 0.1% to 10% by weight.

5. The polymer film of claim 1 , wherein the base film layer includes the olefinic polymer compound in an amount of 0.1% to 40% by weight.

6. 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.

7. 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.

8. 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.

9. 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.

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

11. 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

• C08J2377/02

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

• C09J7/25

  based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds · CPC title

• C08L77/00

  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

• C09J7/20

  characterised by their carriers · CPC title

• C09J2453/006

  in the substrate · CPC title