The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 23, 1990
Filed:
Jul. 28, 1988
Masahiro Yuyama, Niihama, JP;
Teruhisa Koyama, Niihama, JP;
Hideaki Matsurra, Niihama, JP;
Shinji Date, Niihama, JP;
Sumitomo Chemical Co., Ltd., Osaka, JP;
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.