Inner liner for a pneumatic tire assembly

Patent metadata

Field	Value
Publication number	US-9546266-B2
Application number	US-201414769276-A
Country	US
Kind code	B2
Filing date	Mar 4, 2014
Priority date	Mar 13, 2013
Publication date	Jan 17, 2017
Grant date	Jan 17, 2017

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 polyamide 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

What is claimed is:

1. An inner liner for a pneumatic tire assembly, said inner liner comprising:
A) the reaction product of:
i. a polyamide in an amount of from 50 to 65 parts by weight per 100 parts by weight of said inner liner; and
ii. an anhydride-functional copolymer in an amount of 15 to 35 parts by weight per 100 parts by weight of said inner liner; and

B) a poly (ethylene-co-methacrylic acid) ionomer.

2. An inner liner as set forth in claim 1 wherein said poly (ethylene-co-methacrylic acid) ionomer is further defined as a zinc complex.

3. An inner liner as set forth in claim 1 wherein said anhydride-functional copolymer is further defined as a maleic anhydride modified ethylene-octene copolymer.

4. An inner liner as set forth in claim 1 wherein said polyamide composition further comprises a synthetic wax selected from the group of substituted amide waxes, metal stearates, and combinations thereof.

5. An inner liner as set forth in claim 1 having a specific gravity of from 0.8 to 1.15 g/cm 3 .

6. An inner liner as set forth in claim 1 having an oxygen permeation rate of less than 100 cm 3 •mm/(m 2 •day) when tested in accordance with ASTM F3985.

7. A method of forming the inner liner set forth in claim 1 comprising the steps of compounding the polyamide, the anhydride-functional copolymer, and the poly (ethylene-co-methacrylic acid) ionomer and forming the inner liner.

8. An inner liner as set forth in claim 2 wherein said anhydride-functional copolymer is further defined as a maleic anhydride modified ethylene-octene copolymer.

9. 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.

Assignees

• Basf Se

Inventors

• Hanley Stephen
• Liu Zhenguo

Classifications

• C08G69/36

  derived from amino acids, polyamines and polycarboxylic acids · CPC title

• C08L91/06

  Waxes · CPC title

• C08L77/02

  Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08L77/10 takes precedence) · CPC title

• 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