Film for a tire inner liner and preparation method therefor
AssigneeKolon Industries, Inc.
InventorsIl Chung, Gi-Woong Kim, Sang-Mok Lee, Ok-Hwa Jeon
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Abstract
The present invention relates to a film for a tire inner liner, particularly to a film for a tire inner liner including: a base film including a copolymer or a mixture of polyamide-based resin and a polyether-based resin; and an adhesive layer including a resorcinol-formalin-latex (RFL)-based adhesive, wherein the base film has a tensile recovery rate of 30% to 80%. The film for a tire inner liner of the present invention may exhibit an excellent gas barrier property with a thin thickness, and thus enables light weight of a tire and improvement in automobile mileage, and enables easier forming during a tire manufacturing process.
Claims17
A film for a tire inner liner comprising:
- a base film layer comprising a copolymer comprising a polyamide-based segment and a polyether-based segment, and a polyamide-based resin;
- and
- an adhesive layer formed on at least one side of the base film layer and comprising a resorcinol-formalin-latex (RFL)-based adhesive,
- wherein a tensile recovery rate of the base film layer according to the following Formula 1 is 30% to 80%:
- Tensile Recovery Rate(%)=(L1−L2)*100/(L1−L0) [Formula 1]
- in Formula 1, L1 denotes the length of the base film at 100% elongation at room temperature, L2 denotes the final length of the base film when the base film is shrunken after 100% elongation at room temperature, and L0 denotes the length of the original sample before elongation.
A method for preparing a film for a tire inner liner comprising:
- mixing a copolymer comprising a polyamide-based segment and a polyether-based segment, and a polyamide-based resin, and melting and extruding the mixture at a temperature in the range of 230 to 300° C. to form a base film layer;
- and
- forming an adhesive layer comprising a resorcinol-formalin-latex (RFL)-based adhesive on at least one side of the base film layer.
Dependencies are inferred from the claim text.