Patent Number: 6,309,720

Title: Polyester laminate film, metal plate laminated with this film and film-laminated metal container

Abstract: A polyester laminate film comprising plural polyester layers, which comprises one surface layer comprising a polyester and a lubricant having an average particle size of 1-3 .mu.m in a proportion of 1-5 wt % and the other surface layer comprising a polyester wherein 5-15 mol % of the entire acid component is a dimer acid component, the polyester laminate film having a crystallization peak temperature of 80-120.degree. C. under temperature rise of the On The polyester laminate film of the present invention has a lower crystallization peak temperature when the film is under temperature rise, as compared to conventional polyethylene terephthalate. As a consequence, the film is free of whitening upon retorting, even after the film was subjected to remelting treatment and rapid cooling for noncystallization and unorienting. Therefore, the film serves well as a laminate film for food containers and beverage cans that undergo retort sterilization. Inasmuch as the polyester layer on one surface contains a large amount of a lubricant and has releasing property, the film serves well as a laminate film for a metal plate, which is required to have releasing property from a mold during manufacture of containers such as a two-piece can. The polyester layer on the other surface contains a large amount of dimer acid and the film is superior in impact resistance. Hence, the film serves well as a laminate film for a metal container which is susceptible to damage due to impact during distribution process.

Inventors: Shimizu; Hideki (Inuyama, JP), Nagano; Hiroshi (Inuyama, JP), Oko; Tsutomu (Inuyama, JP), Igushi; Hideki (Inuyama, JP)

Assignee: Toyo Boseki Kabushiki Kaisha

International Classification: B32B 15/08 (20060101); B32B 27/36 (20060101); B32B 015/08 (); B32B 027/08 (); B32B 027/36 ()

Expiration Date: 10/30/2018