Multilayer film formed of polyester and having a core layer suit

Details Multilayer film formed of polyester and having a core layer suit Multilayer film formed of polyester and having a core layer suit

1985-09-18

1988-03-29

Swisher, Nancy A. B.

Stock material or miscellaneous articles

Composite

Of polyester

428482, 428910, B32B 2736

Patent

active

047343354

ABSTRACT:
The present invention relates to a three-layer film formed of polyesters, which is preferably produced in a coextrusion process. The film is suitable for embossing and does not tend to stick to the embossing tool, even at elevated temperatures. Under a thermal load which is necessarily applied in the further processing of the film, the depth of embossing is not changed or is only negligibly changed. The three-layer film formed of polyesters has external layers with higher melting points than the intermediate layer. Preferably, the external layers comprise polyethylene terephthalate and the intermediate layer of copolyester.

REFERENCES:
patent: 2719100 (1955-09-01), Banigan
patent: 3000754 (1961-09-01), Zentmajer
patent: 3900653 (1975-08-01), Riboulet et al.
patent: 4011358 (1977-03-01), Roelofs
patent: 4086388 (1978-04-01), Brown
patent: 4198458 (1980-04-01), Mitsuishi et al.
patent: 4263364 (1981-04-01), Seymour et al.
patent: 4456639 (1984-06-01), Drower et al.

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