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US 9,757,984 B2Granted
Film for tire inner liner, and method for manufacturing the same
AssigneeKolon Industries, Inc.
InventorsSo-Yeon Kwon, Young-Han Jeong, Il Chung, Ok-Hwa Jeon
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Abstract
The present invention relates to a film for a tire inner liner including a base film layer including a copolymer or a mixture of a polyamide-based resin and a polyether-based resin, and an adhesive layer including a resorcinol-formalin-latex (RFL)-based adhesive, and having low shrinkage rate when elongated at a high temperature and then cooled to room temperature, and a method for manufacturing the same.
Claims17
A film for a tire inner liner, comprising:
- a base film layer comprising a polyamide-based resin and an elastomer copolymer comprising polyamide-based segments and polyether-based segments;
- and
- an adhesive layer comprising a resorcinol-formalin-latex (RFL)-based adhesive,
- wherein the content of the polyether-based segments in the elastomer copolymer is 15 to 50 wt % based on total weight of the base film layer, and the base film layer comprises the polyamide-based resin and the elastomer copolymer in a weight ratio of 5:5 to 4:6,
- the thickness of the base film layer is 30 to 300 μm, and
- the film for a tire inner liner has a shrinkage rate of 5% or less when elongated 50 to 150% at 80 to 160° C. and then cooled to room temperature,
- wherein the elastomer copolymer has a weight average molecular weight of 50,000 to 300,000.
4 more elements
A method for manufacturing a film for a tire inner liner, comprising:
- mixing at a weight ratio of 5:5 to 4:6 a polyamide-based resin and an elastomer copolymer comprising polyamide-based segments and polyether-based segments;
- melting and extruding the mixture of the polyamide-based resin and the elastomer copolymer comprising polyamide-based segments and polyether-based segments at 230 to 300° C. to form a base film layer having a thickness of 30 to 300 μm;
- and
- forming an adhesive layer comprising a resorcinol-formalin-latex (RFL)-based adhesive on at least one side of the base film layer,
- wherein the content of the polyether-based segments in the elastomer copolymer is 15 to 50 wt % based on total weight of the base film layer, and
- the film for a tire inner liner has a shrinkage rate of 5% or less when elongated 50 to 150% at 80 to 160° C. and then cooled to room temperature,
- wherein the elastomer copolymer has a weight average molecular weight of 50,000 to 300,000.
4 more elements
Dependencies are inferred from the claim text.