Laminate, inner liner material and pneumatic tire
View Patent ↗With respect to a laminate of a film formed of a thermoplastic resin or thermoplastic elastomer composition and a layer formed of a rubber composition in which an epoxidized natural rubber is blended, the adhesion between the film and the layer of the rubber composition is improved without using a large amount of the epoxidized natural rubber. A laminate of a film formed of a thermoplastic resin or thermoplastic elastomer composition and a layer formed of a rubber composition, said laminate being characterized in that: 5-60% by mass of a rubber component contained in the rubber composition is composed of an epoxidized natural rubber and 20-50% by mass of the rubber component is composed of a butadiene rubber; and the rubber composition contains an unsubstituted or substituted aromatic carboxylic acid having a pKa of 1.5-4.0 in an amount of 0.5-5 parts by mass per 100 parts by mass of the rubber component.
1. A laminate, comprising:
a film of a thermoplastic resin or a thermoplastic elastomer composition; and
a layer of a rubber composition, wherein the rubber composition comprises a rubber component comprising 5 to 60% by weight of an epoxidized natural rubber and 20 to 50% by weight of a butadiene rubber, and the rubber composition comprises an unsubstituted or substituted aromatic carboxylic acid having a pKa of 1.5 to 4.0 in an amount of 0.5 to 5 parts by weight based on 100 parts by weight of the rubber component.
2. The laminate according to claim 1 , wherein the unsubstituted or substituted aromatic carboxylic acid is at least one selected from salicylic acid, 4-amino salicylic acid, benzoic acid, o-aminobenzoic acid, and 2,4-dihydroxybenzoic acid.
3. The composition according to claim 1 , wherein the epoxidized natural rubber has a degree of epoxidation of 10 to 75 mol %.
4. The laminate according to claim 1 , wherein the thermoplastic resin is at least one selected from the group consisting of poly(vinyl alcohol), ethylene-vinyl alcohol copolymer, nylon 6, nylon 66, nylon 11, nylon 12, nylon 610, nylon 612, nylon 6/66, nylon MXD6, and nylon 6T.
5. The laminate according to claim 1 , wherein the thermoplastic elastomer composition is a composition obtained by dispersing an elastomeric component in a thermoplastic resin component, the thermoplastic resin component being at least one selected from the group consisting of poly(vinyl alcohol), ethylene-vinyl alcohol copolymer, nylon 6, nylon 66, nylon 11, nylon 12, nylon 610, nylon 612, nylon 6/66, nylon MXD6, and nylon 6T, the elastomeric component being at least one selected from the group consisting of brominated isobutylene-p-methylstyrene copolymer, maleic anhydride-modified ethylene-α-olefin copolymer, ethylene-glycidyl methacrylate copolymer, and maleic anhydride-modified ethylene-ethyl acrylate copolymer.
6. An inner liner material for pneumatic tires, comprising the laminate according to claim 1 .
7. A pneumatic tire produced using the laminate according to claim 1 as an inner liner material.
8. The composition according to claim 2 , wherein the epoxidized natural rubber has a degree of epoxidation of 10 to 75 mol %.
9. The laminate according to claim 8 , wherein the thermoplastic resin is at least one selected from the group consisting of poly(vinyl alcohol), ethylene-vinyl alcohol copolymer, nylon 6, nylon 66, nylon 11, nylon 12, nylon 610, nylon 612, nylon 6/66, nylon MXD6, and nylon 6T.
10. The laminate according to claim 2 , wherein the thermoplastic resin is at least one selected from the group consisting of poly(vinyl alcohol), ethylene-vinyl alcohol copolymer, nylon 6, nylon 66, nylon 11, nylon 12, nylon 610, nylon 612, nylon 6/66, nylon MXD6, and nylon 6T.
11. The laminate according to claim 3 , wherein the thermoplastic resin is at least one selected from the group consisting of poly(vinyl alcohol), ethylene-vinyl alcohol copolymer, nylon 6, nylon 66, nylon 11, nylon 12, nylon 610, nylon 612, nylon 6/66, nylon MXD6, and nylon 6T.
12. The laminate according to claim 8 , wherein the thermoplastic elastomer composition is a composition obtained by dispersing an elastomeric component in a thermoplastic resin component, the thermoplastic resin component being at least one selected from the group consisting of poly(vinyl alcohol), ethylene-vinyl alcohol copolymer, nylon 6, nylon 66, nylon 11, nylon 12, nylon 610, nylon 612, nylon 6/66, nylon MXD6, and nylon 6T, the elastomeric component being at least one selected from the group consisting of brominated isobutylene-ρ-methylstyrene copolymer, maleic anhydride-modified ethylene-α-olefin copolymer, ethylene-glycidyl methacrylate copolymer, and maleic anhydride-modified ethylene-ethyl acrylate copolymer.
13. The laminate according to claim 2 , wherein the thermoplastic elastomer composition is a composition obtained by dispersing an elastomeric component in a thermoplastic resin component, the thermoplastic resin component being at least one selected from the group consisting of poly(vinyl alcohol), ethylene-vinyl alcohol copolymer, nylon 6, nylon 66, nylon 11, nylon 12, nylon 610, nylon 612, nylon 6/66, nylon MXD6, and nylon 6T, the elastomeric component being at least one selected from the group consisting of brominated isobutylene-p-methylstyrene copolymer, maleic anhydride-modified ethylene-α-olefin copolymer, ethylene-glycidyl methacrylate copolymer, and maleic anhydride-modified ethylene-ethyl acrylate copolymer.
14. The laminate according to claim 3 , wherein the thermoplastic elastomer composition is a composition obtained by dispersing an elastomeric component in a thermoplastic resin component, the thermoplastic resin component being at least one selected from the group consisting of poly(vinyl alcohol), ethylene-vinyl alcohol copolymer, nylon 6, nylon 66, nylon 11, nylon 12, nylon 610, nylon 612, nylon 6/66, nylon MXD6, and nylon 6T, the elastomeric component being at least one selected from the group consisting of brominated isobutylene-p-methylstyrene copolymer, maleic anhydride-modified ethylene-α-olefin copolymer, ethylene-glycidyl methacrylate copolymer, and maleic anhydride-modified ethylene-ethyl acrylate copolymer.
15. An inner liner material for pneumatic tires, comprising the laminate according to claim 2 .
16. An inner liner material for pneumatic tires, comprising the laminate according to claim 3 .
17. An inner liner material for pneumatic tires, comprising the laminate according to claim 4 .
18. An inner liner material for pneumatic tires, comprising the laminate according to claim 5 .
19. A pneumatic tire produced using the laminate according claim 2 as an inner liner material.
20. A pneumatic tire produced using the laminate according claim 3 as an inner liner material.