Optically isotropic blends of styrene/acrylonitrile and methyl m

Details Optically isotropic blends of styrene/acrylonitrile and methyl m Optically isotropic blends of styrene/acrylonitrile and methyl m

1990-09-10

1993-06-08

Seidleck, James J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525238, 525222, 525227, 525241, 525205, C08L 2504, C08L 2512, C08L 3312

Patent

active

052180514

ABSTRACT:
Optically isotropic blends comprising styrene/acrylonitrile copolymers containing from 18 to 32 percent acrylonitrile and methyl methacrylate/glutarimide resins containing from 10 to 50 weight percent methyl methacrylate and having stress optical coefficient of between -500 Brewsters and +500 Brewsters are usefully employed in the preparation of molded objects having reduced birefringence.

REFERENCES:
patent: 4217424 (1980-08-01), Weese et al.
patent: 4246374 (1981-01-01), Kopchik
patent: 4254232 (1981-03-01), Mueller
patent: 4415706 (1983-11-01), Staas
patent: 4436871 (1984-03-01), Staas
patent: 4727117 (1988-02-01), Hallden-Abberton et al.
patent: 4954574 (1990-09-01), Hallden-Abberton et al.
Concise Chemical and Technical Dictionary, edited by M. Bennett, 1947, p. 684. Chem. Pub. Co. Inc.
Rohm & Haas, Paraloid.RTM. EXL-4000 Series (May 17, 1980).

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