Polyester laminated film
AssigneeToyo Boseki Kabushiki Kaisha
InventorsYasuo Yoshinaka, Katsuhiko Nose, Yoshinori Takegawa, Norimi Tabota, Akito Hamano, Katsuaki Kuze
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Abstract
A polyester laminated film with excellent sealing ability is provided. The polyester laminated film comprises a base film of a polyester resin and a sealing film of a polyester composition, said sealing film being disposed on at least one side of said base film, wherein the sealing energy, which is measured when two pieces of said laminated films are joined together with the respective sealing films facing each other, is 300 g.cm/15 mm or more.
Claims16
A polyester laminated film comprising a base film of a polyester resin and a sealing film of a polyester composition, said sealing film being disposed on at least one side of said base film, wherein the sealing energy, which is measured when two pieces of said laminated films are joined together with the respective sealing films facing each other, is 400 g.cm/15 mm or more, wherein said sealing film is a heat-sealing film and wherein the starting temperature of thermal molecular motion in said polyester composition is in the range of 30.degree. to 65.degree. C., wherein said polyester composition comprises:
- a polyester resin A containing at least one diol component of the formula:
- ##STR3## wherein R.sub.1 and R.sub.2 are, independently, hydrogen or alkyl containing 1 to 6 carbon atoms, with the proviso that at least one of R.sub.1 and R.sub.2 is alkyl containing 1 to 6 carbon atoms, and wherein n and m are, independently, integers of 1 to 6;
- and
- a polyester resin B containing at least one dicarboxylic acid component of the formula:
- HOOC--(CH.sub.2).sub.p 13 COOH (IIa)
- wherein p is an integer of 4 to 20;
- and at least one glycol component of the formula:
- HO--(CH.sub.2).sub.q --OH (IIb)
- wherein q is an integer of 4 to 10.
Dependencies are inferred from the claim text.