Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1988-07-28
1990-10-23
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
5253302, Q08F22002
Patent
active
049653210
ABSTRACT:
A thermoplastic copolymer which comprises (a) 2.0 to 22.0% by weight of a methyl methacrylate unit, (b) 38.0 to 70.0% by weight of a styrene unit, and 20.0 to 45.0% by weight in total of both (c) a methacrylic acid unit and (d) an acid anhydride unit having a 6-membered ring structures. The acid anhydride unit has a 6-membered ring structure being in an amount of not less than 16.0% by weight per total amount of the units (c) and (d), and the copolymer has a reduced viscosity of 0.3 to 1.5 dl/g (measured in a 1% solution in dimethylformamide at 25.degree. C. which has well balanced heat distortion resisting properties, water absorption properties and mechanical strength and excellent heat stability in the fabrication thereof, and is useful for producing various parts such as automobile parts, electrical parts, industrial parts and miscellaneous goods.
REFERENCES:
patent: 3137660 (1964-06-01), Jones
patent: 4789709 (1988-12-01), Kato et al.
Chemical Abstracts 100:15756w (1984), European Search Report 88 30 6290.
Chemical Abstracts 104:34525f (1986), European Search Report 88 30 6290.
An English abstract WPI Acc No. 84-026819/05 which is an abstract of Japanese Patent First Publication (Kokai) No. 217501/1983.
An English abstract WPI Acc No. 85-149205/25 which is an abstract of Japanese Patent First Publication (Kokai) No. 81239/1985.
An English abstract WPI Acc No. 87-174774/25 which is an abstract of Japanese Patent First Publication (Kokai) No. 106946/1987.
Date Shinji
Koyama Teruhisa
Matsurra Hideaki
Yuyama Masahiro
Schofer Joseph L.
Sumitomo Chemical Co,. Ltd.
Walker Alex H.
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