Producing extruded solid plastic sheet and film

Details Producing extruded solid plastic sheet and film Producing extruded solid plastic sheet and film

Filed on

1992-11-05

Date issued

1994-02-15

Examiner

Thurlow, Jeffery

Patent Class

Plastic and nonmetallic article shaping or treating: processes

SubClass

Forming continuous or indefinite length work

SubSubClass

Shaping by extrusion

Other Related Categories

2642105, 264237, 264280, 425325, 425327, 425371, B29C 4788

Type

Patent

Status

active

Patent number

052864367

Description

ABSTRACT:
Extruded, smooth finished solid sheet or film, which may have a thickness<1 mm, 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:
patent: 2791801 (1957-05-01), Szantay
patent: 2815308 (1957-12-01), Robinson et al.
patent: 4734229 (1988-03-01), Johnson et al.
patent: 4826560 (1989-05-01), Held
patent: 4858139 (1989-08-01), Wirtz
patent: 4859392 (1989-08-01), Vetter
patent: 4921669 (1990-05-01), Vetter et al.
patent: 4994229 (1991-02-01), Flecknoe-Brown
patent: 5149481 (1992-09-01), Gross et al.
Chemical Abstracts, vol. 91 (1979), S. Junji et al (Asahi Chemical Industry Co. Jpn. Kokai Tokyo Koho 79 17,982 (Cl. B29D7/02), Feb. 9, 1979.

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