Inner Liner For A Pneumatic Tire Assembly

Patent metadata

Field	Value
Publication number	US-2016002453-A1
Application number	US-201414769276-A
Country	US
Kind code	A1
Filing date	Mar 4, 2014
Priority date	Mar 13, 2013
Publication date	Jan 7, 2016
Grant date	—

Abstract

A polyamide composition comprises a polyamide, an anhydride-functional copolymer reactive with the polyamide, and a poly (ethylene-co-methacrylic acid) ionomer. A pneumatic tire assembly includes an inner liner which is formed from the poly-amide composition. The inner liner comprises the reaction product of the polyamide and the anhydride-functional copolymer, as well as the (ethylene-co-methacrylic acid) ionomer.

First claim

1 . A polyamide composition for forming an inner liner for a pneumatic tire, said polyamide composition comprising:
A) a polyamide; B) an anhydride-functional copolymer reactive with said polyamide; C) a poly (ethylene-co-methacrylic acid) ionomer; and D) a synthetic wax; and
wherein a weight ratio of (A+B):C in said polyamide composition is from 2:1 to 4:1; and
wherein a weight ratio of C:D in said polyamide composition is from 10:1 to 100:1.

2 . A polyamide composition as set forth in claim 1 consisting essentially of said polyamide, said anhydride-functional copolymer, said poly(ethylene-co-methacrylic acid) ionomer, and said synthetic wax.

3 . A polyamide composition as set forth in claim 1 that is substantially free of plasticizer.

4 . A polyamide composition as set forth in claim 1 wherein said poly (ethylene-co-methacrylic acid) ionomer is further defined as a zinc complex.

5 . A polyamide composition as set forth in claim 4 wherein said poly (ethylene-co-methacrylic acid) ionomer is present in an amount of from 5 to 55 parts by weight per 100 parts by weight of said polyamide composition.

6 . A polyamide composition as set forth in claim 1 wherein said anhydride-functional copolymer is further defined as a maleic anhydride modified ethylene-octene copolymer.

7 . A polyamide composition as set forth in claim 6 wherein said anhydride-functional copolymer is present in an amount of from 5 to 55 parts by weight per 100 parts by weight of said polyamide composition.

8 . A polyamide composition as set forth in claim 1 wherein said synthetic wax comprises N, N-ethylene bis-stearamide and/or sodium stearate.

9 . A polyamide composition as set forth in claim 8 wherein said synthetic wax is present in an amount of from 0.1 to 10 parts by weight per 100 parts by weight of said polyamide composition.

10 . A polyamide composition as set forth in claim 1 wherein said polyamide is present in an amount of from 30 to 75 parts by weight per 100 parts by weight of said polyamide composition.

11 . An inner liner for a pneumatic tire assembly, said inner liner comprising:
A) the reaction product of:
i. a polyamide; and
ii. an anhydride-functional copolymer; and
B) a poly (ethylene-co-methacrylic acid) ionomer.

12 . An inner liner as set forth in claim 11 wherein said poly (ethylene-co-methacrylic acid) ionomer is further defined as a zinc complex.

13 . An inner liner as set forth in claim 11 wherein said anhydride-functional copolymer is further defined as a maleic anhydride modified ethylene-octene copolymer.

14 . An inner liner as set forth in claim 11 wherein said polyamide composition further comprises a synthetic wax selected from the group of substituted amide waxes, metal stearates, and combinations thereof.

15 . An inner liner as set forth in claim 11 wherein said reaction product is present in an amount of from 15 to 99 parts by weight per 100 parts by weight of said polyamide composition, and said poly (ethylene-co-methacrylic acid) ionomer is present in an amount of from 5 to 55 parts by weight per 100 parts by weight of said polyamide composition.

16 . An inner liner as set forth in claim 11 having a specific gravity of from 0.8 to 1.15 g/cm 3 .

17 . An inner liner as set forth in claim 11 having an oxygen permeation rate of less than 100 cm 3 •mm/(m 2 •day) when tested in accordance with ASTM F3985.

18 . A method of forming the inner liner set forth in claim 11 comprising the steps of compounding the polyamide composition, the anhydride-functional copolymer, and the poly (ethylene-co-methacrylic acid) ionomer and forming the inner liner.

19 . An inner liner as set forth in claim 12 wherein said anhydride-functional copolymer is further defined as a maleic anhydride modified ethylene-octene copolymer.

20 . An inner liner as set forth in claim 1 wherein said polyamide is selected from the group of polyamide 6, polyamide 6,6, polyamide 6/66, and combinations thereof.

21 . A polyamide composition as set forth in claim 8 wherein said polyamide is polyamide 6/66, said poly (ethylene-co-methacrylic acid) ionomer is a zinc complex, and said anhydride-functional copolymer is a maleic anhydride modified ethylene-octene copolymer.

Assignees

• Basf Se

Inventors

• Hanley Stephen
• Liu Zhenguo

Classifications

• C08L23/36 Primary

  by reaction with nitrogen-containing compounds, e.g. by nitration · CPC title

• B60C1/0008 Primary

  Compositions of the inner liner · CPC title

• C08K5/098

  Metal salts of carboxylic acids · CPC title

• C08L51/06

  grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond · CPC title

• C08K5/20

  Carboxylic acid amides · CPC title