Pneumatic tire and laminate
AssigneeThe Yokohama Rubber Co., Ltd.
InventorHirokazu Shibata
Life of this patent
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Abstract
In a pneumatic tire containing as an inner liner material a laminate of a film of a thermoplastic resin or a thermoplastic elastomer composition and a layer of a rubber composition for improving the adhesive strength between the film and the rubber composition, the rubber composition comprises 100 parts by weight of a rubber component, 0.5 to 20 parts by weight of a condensate between a compound expressed by formula (1): wherein R1, R2, R3, R4 and R5 are hydrogen, a hydroxyl group or a C1 to C8 alkyl group, and formaldehyde, 0.25 to 200 parts by weight of a methylene donor, and a vulcanizing agent; and a weight ratio of the methylene donor content to the condensate content is 0.5 to 10.
Claims16
A pneumatic tire comprising as an inner liner material a laminate composed of a film of a thermoplastic resin wherein the thermoplastic resin is at least one member selected from the group consisting of poly(vinyl alcohol), an ethylene-vinyl alcohol copolymer, nylon 6, nylon 66, nylon 11, nylon 12, nylon 610, nylon 612, nylon 6/66, nylon MXD6, and nylon 6T or a thermoplastic elastomer composition wherein the thermoplastic elastomer composition comprises a thermoplastic resin component and an elastomer component dispersed in the thermoplastic resin component;
- the thermoplastic resin component is at least one member selected from the group consisting of poly(vinyl alcohol), an ethylene-vinyl alcohol copolymer, nylon 6, nylon 66, nylon 11, nylon 12, nylon 610, nylon 612, nylon 6/66, nylon MXD6 and nylon 6T;
- and the elastomer component is at least one member selected from the group consisting of a brominated isobutylene-p-methylstyrene copolymer, a maleic anhydride-modified ethylene-α-olefin copolymer, an ethylene-glycidyl methacrylate copolymer and a maleic anhydride-modified ethylene-ethyl acrylate copolymer and a layer of a rubber composition, wherein said film is in direct contact with said layer of a rubber composition and wherein the rubber composition comprises
- 100 parts by weight of a rubber component, wherein the rubber component is at least one member selected from the group consisting of natural rubber, isoprene rubber, epoxidized natural rubber, styrene/butadiene rubber, butadiene rubber, acrylonitrile butadiene rubber, hydrogenated acrylonitrile butadiene rubber, and hydrogenated styrene/butadiene rubber,
- 0.5 to 4 parts by weight of a condensate between a compound expressed by formula (1):
- wherein R1, R2, R3, R4 and R5 are hydrogen, a hydroxyl group or a C1 to C8 alkyl group, and formaldehyde,
- 0.25 to 40 parts by weight of a methylene donor, wherein the methylene donor is a modified etherified methylolmelamine, and
- a vulcanizing agent;
- and
- a weight ratio of the methylene donor to the condensate is 0.5 to 10, and
- the vulcanizing agent is sulfur or an organic peroxide.
An inner liner material comprising a laminate comprising a film of a thermoplastic elastomer composition wherein the thermoplastic elastomer composition comprises a thermoplastic resin component and an elastomer component dispersed in the thermoplastic resin component;
- the thermoplastic resin component is at least one member selected from the group consisting of poly(vinyl alcohol), an ethylene-vinyl alcohol copolymer, nylon 6, nylon 66, nylon 11, nylon 12, nylon 610, nylon 612, nylon 6/66, nylon MXD6 and nylon 6T;
- and the elastomer component is at least one selected from the group consisting of a brominated isobutylene-p-methylstyrene copolymer, a maleic anhydride-modified ethylene-α-olefin copolymer, an ethylene-glycidyl methacrylate copolymer and a maleic anhydride-modified ethylene-ethyl acrylate copolymer and a layer of a rubber composition, wherein the rubber composition comprises
- 100 parts by weight of a rubber component, wherein the rubber component is at least one member elected from the group consisting of natural rubber, isoprene rubber, epoxidized natural rubber, styrene/butadiene rubber, butadiene rubber, acrylonitrile butadiene rubber, hydrogenated acrylonitrile butadiene rubber, and hydrogenated styrene/butadiene rubber,
- 0.5 to 4 parts by weight of a condensate between a compound expressed by formula (1):
- wherein R1, R2, R3, R4 and R5 are hydrogen, a hydroxyl group or a C1 to C8 alkyl group, and formaldehyde,
- 0.25 to 40 parts by weight of a methylene donor, wherein the methylene donor is a modified etherified methylolmelamine, and
- a vulcanizing agent;
- and
- a weight ratio of the methylene donor to the condensate is 0.5 to 10.
Dependencies are inferred from the claim text.