Barrier layer for inflatable articles

Patent metadata

Field	Value
Publication number	US-2017066902-A9
Application number	US-201113877155-A
Country	US
Kind code	A9
Filing date	Sep 16, 2011
Priority date	Sep 30, 2010
Publication date	Mar 9, 2017
Grant date	—

Abstract

A barrier layer for impeding the flow of inflation gas through an inflatable article, the barrier layer constructed of a material that is based upon a cross-linkable rubber composition, the cross-linkable rubber composition comprising, per 100 parts by weight of rubber (pbr) at least 50 phr of a primary elastomer selected from at least one of a halogenated butyl rubber or a polymeric halogenated rubber comprising C 4 to C 7 isooleiln derived units, para-alkylstyrene derived units and para-(haloalkylstyrene) derived units. The rubber composition may further include between 0 phr and 50 phr of a secondary diene elastomer and a platy filler. Additionally the rubber composition includes 1,3-phenylene dimaleimide and is cured with a sulfur curing system, which includes an accelerator.

First claim

1 . A barrier layer for impeding the flow of inflation gas through an inflatable article, the barrier layer constructed of a rubber composition that is based upon a cross-linkable elastomer composition, the cross-linkable elastomer composition comprising, per 100 parts by weight of rubber (phr):
at least 50 phr of a primary elastomer selected from at least one of a halogenated butyl rubber or a polymeric halogenated rubber comprising C 4 to C 7 isoolefin derived units, para-alkylstyrene derived units and para-(haloalkylstyrene) derived units; between 0 phr and 50 phr of a secondary diene elastomer; a platy filler; at least 0.1 phr of 1,3-phenylene dimaleimide; and a sulfur cure system having sulfur and an accelerator.

2 . The barrier layer of claim 1 , wherein the 1,3-phenylene dimaleimide is not included in the sulfur cure system.

3 . The barrier layer of claim 1 , wherein the rubber composition provides at least a 5 percent reduction in permeability as measured in accordance with ASTM D3985 at 40° C. over a second rubber composition identical to the rubber composition but for the second rubber composition having no 1,3-phenylene dimaleimide.

4 . The barrier layer of claim 1 , wherein the halogenated butyl rubber is selected from one or more of a chlorobutyl rubber or a bromobutyl rubber.

5 . The barrier layer of claim 4 , wherein the cross-linkable elastomer composition comprises 100 phr of the one or more of the chlorobutyl rubber or the bromobutyl rubber.

6 . The barrier layer of claim 1 , wherein the halogenated polymeric rubber is a halogenated poly(isobutylene-co-p-methylstyrene).

7 . The barrier layer of claim 6 , wherein the halogenated poly(isobutylene-co-p-methylstyrene) is a terpolymer of isobutylene, para-methylstyrene and brominated para-methylstyrene.

8 . The barrier layer of claim 7 , wherein the cross-linkable rub elastomer composition comprises 100 phr of the terpolymer.

9 . The barrier layer of claim 1 , wherein the secondary diene elastomer is selected from at least one of polybutadiene rubber, nitrile rubber, polyisoprene rubber, poly(styrene-co-butadiene) rubber, poly(isoprene-co-butadiene) rubber, styrene-isoprene-butadiene rubber, ethylene-propylene rubber, halogenated isoprene, halogenated isobutylene copolymers, polychloroprene or star-branched polyisobutylene rubber.

10 . The barrier layer of claim 1 , wherein the secondary diene elastomer is natural rubber.

11 . The barrier layer of claim 1 , wherein the cross-linkable elastomer composition comprises between 70 phr and 100 phr of the primary elastomer.

12 . The barrier layer of claim 1 , wherein the cross-linkable elastomer composition comprises between 0.25 phr and 3 phr of the BMI.

13 . The barrier layer of claim 1 , wherein the platy filler is an organo-modified platy filer.

14 . The barrier layer of claim 13 , wherein the platy filler is an organoclay.

15 . The barrier layer of claim 1 , wherein the cross-linkable elastomer composition comprises between 1 phr and 15 phr of the platy filler.

16 . The barrier layer of claim 1 , wherein the barrier layer is an inner tube adapted for a pneumatic tire.

17 . The barrier layer of claim 1 , wherein the barrier layer is disposed on an interior surface of the pneumatic tire.

18 . A pneumatic tire comprising a barrier layer for impeding the flow of inflation gas through the pneumatic tire, the barrier layer constructed of a rubber composition that is based upon a cross-linkable elastomer composition, the cross-linkable elastomer comprising, per 100 parts by weight of rubber (phr):
at least 50 phr of a polymeric halogenated rubber comprising C 4 to C 7 isoolefin derived units, para-alkylstyrene derived units and para-(haloalkylstyrene) derived units; between 0 phr and 50 phr of a secondary diene elastomer; a platy filler; at least 0.1 phr of 1,3-phenylene dimaleimide; and a sulfur cure system having sulfur and an accelerator.

19 . The pneumatic tire of claim 18 , wherein the halogenated polymeric rubber is a halogenated poly(isobutylene-co-p-methylstyrene).

20 . The pneumatic tire of claim 19 , wherein the halogenated poly(isobutylene-co-p-methylstyrene) is a terpolymer of isobutylene, para-methylstyrene and brominated para-methylstyrene.

21 . The pneumatic tire of claim 18 , wherein the barrier layer is disposed on an interior surface of the pneumatic tire.

22 . The pneumatic tire of claim 18 , wherein the 1,3-phenylene dimaleimide is not included in the sulfur cure system.

23 . The pneumatic tire of claim 18 , wherein the rubber composition provides at least a 5 percent reduction in permeability measured in accordance with ASTM D3985 at 40° C. over a second rubber composition identical to the rubber composition but for the second rubber composition's 1,3-phenylene dimaleimide content.

24 - 30 . (canceled)

Assignees

• Bergman Brian R
• Michelin Rech Tech
• Michelin & Cie

Inventors

• Bergman Brian R

Classifications

• B60C1/0008 Primary

  Compositions of the inner liner · CPC title

• C08K5/3415 Primary

  Five-membered rings · CPC title

• C08K5/54

  Silicon-containing compounds {(C08K5/0091 takes precedence)} · CPC title