Polymer films

Patent metadata

Field	Value
Publication number	US-10173469-B2
Application number	US-201414894386-A
Country	US
Kind code	B2
Filing date	May 27, 2014
Priority date	May 27, 2013
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

There is provided a polymer film which includes: a base film layer including a polyamide-based resin having a particular relative viscosity and a copolymer including a polyamide-based segment and a polyether-based segment having a specific content; and an adhesive layer formed on at least one side of the base film layer, wherein a ratio of the melt viscosity of the copolymer to the melt viscosity of the polyamide resin is 0.65 to 1.2 at a shear rate of 1000 s−1 and a temperature of 260° C.

First claim

What is claimed is:

1. A polymer film which comprises:
a base film layer comprising a polyamide-based resin having a relative viscosity (96% sulfuric acid solution) of 3.0 to 3.5, an olefinic polymer compound, and a copolymer comprising 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 resorcinol-formalin-latex (RFL)-based adhesive,
wherein a 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 a ratio of a melt viscosity of the copolymer to a melt viscosity of the polyamide resin is 0.60 to 1.2 at a shear rate of 1000 s−1 and a temperature of 260° C., 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 3.5:6.5:2 in the base film layer.

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

3. The polymer film of claim 1 , wherein the ratio of the melt viscosity of the copolymer to the melt viscosity of the polyamide resin is 1.0 to 2.0 at a shear rate of 100 s− 1 and a temperature of 260° C.

4. The polymer film of claim 1 , wherein the ratio of the melt viscosity of the copolymer to the melt viscosity of the polyamide resin is 0.60 to 1.1 at a shear rate of 2000 s− 1 and a temperature of 260° C.

5. The polymer film of claim 1 , wherein the ratio of the melt viscosity of the copolymer to the melt viscosity of the polyamide resin is 0.7 to 1.5 at a shear rate of 500 s− 1 and a temperature of 260° C.

6. 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.

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

8. The polymer film of claim 1 , wherein the relative viscosity (96% sulfuric acid solution) of the polyamide-based resin is 3.2 to 3.4.

9. The polymer film of claim 1 , wherein the absolute weight average molecular weight of the copolymer containing polyamide-based segments and polyether-based segments is 50,000 to 300,000.

10. The polymer film of claim 1 , wherein the polyamide-based segment includes a repeating unit of the following Chemical Formula 1 or Chemical Formula 2:

wherein, in Chemical Formula 1, R 1 is a linear or branched alkylene group having 1 to 20 carbon atoms, an arylene group having 6 to 20 carbon atoms, or a linear or branched arylalkylene group having 7 to 20 carbon atoms; and

wherein, in Chemical Formula 2, R 2 is a linear or branched alkylene group having 1 to 20 carbon atoms, and R 3 is a linear or branched alkylene group having 1 to 20 carbon atoms, an arylene group having 6 to 20 carbon atoms, or a linear or branched arylalkylene group having 7 to 20 carbon atoms.

11. The polymer film of claim 1 , wherein the polyether-based segment of the copolymer includes a repeating unit of the following Chemical Formula 3:
—R 6 R 5 —O n R 7 —  [Chemical Formula 3]

wherein, in Chemical Formula 3,
R 5 is a linear or branched alkylene group having 1 to 10 carbon atoms, n is an integer of 1 to 100, and
R 6 and R 7 may be identical or different, and are independently a direct bond, —O—, —NH—, —COO—, or —CONH—.

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

13. 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.

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

15. 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
• Chung Il
• Namgoong Hyun

Classifications

• C09J161/12

  with polyhydric phenols · CPC title

• B60C1/0008 Primary

  Compositions of the inner liner · CPC title

• C09J7/25

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

• C09J2477/006

  in the substrate · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title