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US 4,291,090 AGranted
Heat sealable plastic films coated with a coating composition
OwnerFujisawa Kenji, Katsube Kazuo +4inventors
InventorsFujisawa Kenji, Katsube Kazuo, Yako Tadataka, Uemura Koich, Harada Yuichi, Sakai Yasumasa
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Abstract
Heat sealable plastic films coated with a coating composition in the form of an aqueous dispersion containing specific copolymers in particulate form and which have good heat-sealing properties.
Claims10
A heat sealable coated plastic film comprising a polyolefin or polyester plastic film substrate coated with a composition, which comprises an aqueous dispersion containing, in substantially particulate form, a copolymer of:
- (a) at least one .alpha.,.beta.-unsaturated carboxylic acid, in an amount of from 0.1 to 10 percent by weight of the copolymer,
- (b) at least one acrylic ester selected from the group consisting of alkyl acrylates whose alkyl group contains one to twelve carbon atoms and alkyl methacrylates whose alkyl group contains one to twelve carbon atoms, and
- (c) at least one copolymerizable hydroxyalkyl ester of .alpha.,.beta.-unsaturated carboxylic acids, the amount of component (c) being from 0.1 to 80 percent by weight of the copolymer;
- said ingredients being incorporated in the copolymer in proportions such that the copolymer has an average molecular weight of from 5,000 to 150,000 a second-order transition temperature of from 30.degree. to 70.degree. C., and comprises particles whose size is primarily from 0.01 to 1.0 micron;
- and said copolymer being incorporated in the aqueous dispersion in an amount of from 10 to 60 percent by weight thereof.
2 more elements
Dependencies are inferred from the claim text.