Stock material or miscellaneous articles – Composite – Of polycarbonate
Patent
1995-01-19
1999-03-02
Henderson, Christopher
Stock material or miscellaneous articles
Composite
Of polycarbonate
525439, 525463, 528196, 528204, B32B 2736, C08L 6900, C08L 6702
Patent
active
058768513
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a film to be laminated on a metal, and, more specifically, to a film to be laminated on a metal, which has excellent adhesion to a metal plate and is excellent in a processability into a can, such as drawing fabrication, ironing fabrication or the like for producing metal cans, when laminated on a metal plate and which provides a laminated metal plate having excellent impact resistance.
PRIOR ART
Heretofore, coating has generally been applied to the inner and outer surfaces of a metal can to prevent the surface from corrosion, and thermocurable resins have been used for such coating.
However, thermocurable resin coatings are generally of a solvent type and requires a long time and a heating at a temperature of 150.degree. to 250.degree. C. to form a coating onto a film. A large amount of an organic solvent is scattered or evaporated at the time of baking, which exerts adverse effects on the environment and causes problems in working safety. In addition, cracks and pinholes are easily generated at the time of subsequent processing. Consequently, solutions to these problems have been desired.
In recent years, for the purposes of simplifying production process, improving hygienic aspect, and eliminating pollution, development of processes for obtaining rust resistance without using an organic solvent has been attempted, one of which is to coat a metal can with a thermoplastic resin film. In other words, studies are being conducted on the process in which a thermoplastic resin film is laminated on a metal plate such as tin-plated steel plate, tin-free steel plate, aluminum plate or the like, and then is subjected to drawing fabrication or the like to produce a can. As this thermoplastic resin film, a polyolefin film and a polyamide film have been tried to use, but they did not satisfy all requirements for moldability, heat resistance, odor retention and impact resistance.
Japanese Laid-Open Patent Publication Sho 56-10451 and Japanese Laid-Open Patent Publication Hei 1-192546 disclose that a biaxially oriented polyethylene terephthalate film is laminated on a metal plate via an adhesive layer of a low-melting polyester and the laminated metal plate is used as a can-making material. However, although the biaxially oriented polyethylene terephthalate film has excellent heat resistance and odor retention property, its moldability is insufficient. Therefore, blanching (generation of fine cracks) or rupture of the film may occur in the course of can-making fabrication which inevitably invites large deformation.
Japanese Laid-Open Patent Publication Hei 1-192545 and Japanese Laid-Open Patent Publication Hei 2-57339 disclose that an amorphous or extremely low-crystalline aromatic polyester film is laminated on a metal plate and the laminated metal plate is used as a can-making material.
However, although the amorphous or extremely low-crystalline aromatic polyester film is superior in moldability, it is inferior in odor retention property. Furthermore, it is liable to embrittle by post-treatment such as printing after can-making fabrication, retort sterilization and the like and a prolonged storage, and may deteriorate to a film which is readily cracked by external impact.
Japanese Laid-Open Patent Publication Sho-64-22530 discloses that a thermoset, biaxially oriented polyethylene terephthalate film having a low orientation is laminated on a metal plate and the laminated metal plate is used as a can-making material.
However, this film does not attain a low orientation to such an extent that it can be used in can fabrication, and even if fabricable in the region with a small deformation, it is readily embrittled by subsequent printing and retort treatment such as sterilization of can contents and may deteriorate to a film which is readily cracked by external impact.
Japanese Laid-Open Patent Publication Hei 5-254065 discloses a film to be laminated on a metal, which is prepared by laminating a film of a polymer having a glass transition temperature, Tg, of at least
REFERENCES:
patent: 3098056 (1963-07-01), Schnell
patent: 4025489 (1977-05-01), Bailey
patent: 4115358 (1978-09-01), Vestergaard
patent: 4362775 (1982-12-01), Yabe et al.
patent: 4475241 (1984-10-01), Mueller
patent: 4493872 (1985-01-01), Funderburk
patent: 4539370 (1985-09-01), Nouvertne 525433
Inata Hiroo
Itoh Seiji
Matsumura Shunichi
Tsukamoto Ryoji
Tsukioka Masaaki
Henderson Christopher
Teijin Limited
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