Extruded solid plastic sheet or film

Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...

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428220, 428412, 428421, 428419, 428480, 428521, 428522, B32B 702, B32B 2736, C08F22014

Patent

active

052427420

ABSTRACT:
Extruded, smooth finished solid sheet or film, which may have a thickness <1 mm, comprised of a thermoplastic plastic (such as polycarbonate) with a glass transition temperature >50.degree. C., which under conditions of orientation displays optical birefringence, may be manufactured into a flat strip with smooth finished surfaces, to yield a strip which has characteristics as follows:

REFERENCES:
Chemical Abstracts, vol. 91 (1979), S. Junji et al. (Asahi Chemical Industry Co. Jpn. Kokai Tokkyo Koho 79 17,982 (Cl. B29D7/02), Feb. 9, 1979.

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