Patent EA-000430-B1 (EA)
Title: Vulcanizable tire innerliner compositions and pneumatic tires with this innerliner
Inventor: COSTEMALLE BERNARD JEAN
IPC: C08L21/00
Filed: 1996-05-31
Abstract: 1. A vulcanizable tire innerliner composition comprising a mixture of: i) from about 40 to 80 weight percent of an elastomeric random interpolymer comprising at least about 80 wt% of a polymerized isonomoolefin containing from 4 to 7 carbon atoms and from about 0.05 up to about 20 wt% of copolymerized aromatic monomer units comprising a mixture of the following structure randomly distributed therein:   wherein R and R1 are independently selected from the group consisting of hydrogen and C1 to C4alkyl and Y comprises an ester group having the structure:   wherein R2 and R3 are independently selected from the group consisting of hydrogen and an alkyl group containing 1 to about 6 carbon atoms and R4 is selected from the group consisting of hydrogen, an alkyl group containing from to about 28 carbon atoms, an aryl group and an alkenyl group containing from 2 to about 28 carbon atoms; ii) from about 20 to about 45 wt% of a filler, iii) from 0 to about 25 wt% of a plasticizer oil; and iv) at least 1 wt% of a curing system for said interpolymer. 2. The composition of Claim 1 wherein R2 is hydrogen or methyl. 3. The composition of Claim 2 wherein R3 is hydrogen. 4. The composition of Claim 3 wherein R4 is hydrogen or C3 or C12 alkenyl. 5. The composition of Claim 4 wherein R4 is hydrogen. 6. The composition of Claim 1 wherein said interpolymer contains from about 0.1 to about 5 mol.% of said (b) monomer units. 7. The composition of Claim 1 wherein R and R1 are each hydrogen. 8. The composition of Claim 7 wherein said polymerized isomonoolefin is isobutylene. 9. The composition of Claim 1 wherein said filler is reinforcing grade carbon black. 10. The composition of Claim 1 containing at least about 5 wt% of said plasticizer oil. 11. The composition of Claim 1 wherein said curing system comprises accelerated sulfur curing agents. 12. The composition of Claim 1 wherein said curing system comprises at least one organic peroxide. 13. The composition of Claim 1 wherein said curing system comprises zinc oxide. 14. The composition of Claim 1 wherein said interpolymer is essentially free of halogen. 15. The composition of Claim 1 further containing up to 50 wt%, based on the rubber content of said composition, of one or a mixture of more highly unsaturated rubbers selected from the group consisting of natural rubber, polyisoprene, polybutadiene, butyl rubber, halogenated butyl rubber and copolymers of butadiene with up to 35 wt% ofstyrene or acrylonitrile. 16. A pneumatic tire comprising an outer tread and sidewall portion, an inner carcass portion adhered to said tread sidewall portion and an innerliner sheet adhered to the inner surface of said carcass portion, said innerliner having the composition of Claim 1. 17. A vulcanized composition prepared by heating the composition of Claim 1 at a temperature of from about 100 degree C to about 250 degree C for a period of time sufficient to vulcanize said composition. 18. A vulcanized pneumatic tire prepared by heating the tire structure of Claim 16 at a temperature of from about 100 degree C to about 250 degree C for a period of time sufficient to vulcanize said tire. 19. A process for fabricating a pneumatic tire comprised of a carcass element containing an unsaturated rubber and an innerliner element adhered to said carcass element comprising: a) forming the composition of Claim 1 into an innerliner sheet material; b) exposing said sheet material to a source of high energy radiation sufficient to partially cure said sheet material; c) contacting said partially cured innerliner sheet material with said tire carcass element to form a laminated structure; and d) heating said structure at a temperature of from about 100 degree  to 250 degree C for a period of time sufficient to vulcanize said structure.