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:
Jun. 28, 1988
Filed:
Apr. 06, 1987
Applicant:
Inventors:
Werner Siol, Darmstadt, DE;
Ulrich Terbrack, Reinheim, DE;
Frank Wenzel, Darmstadt, DE;
Winfried Wunderlich, Rossdorf, DE;
Assignee:
Rohm GmbH, Darmstadt, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F / ; C08F / ;
U.S. Cl.
CPC ...
526224 ; 5263292 ;
Abstract
A method for making thermostable methyl methacrylate/alpha-methylstyrene copolymers having a high heat distortion temperature and adaptable to use as molding compounds by emulsion polymerization of these monomers together with lower alkyl acrylates and/or styrene, the water phase being less than 70 weight percent of the total monomer/water components and the amount of emulsifier being less than 0.5 weight percent of the water component, the copolymer being isolated by freeze coagulation or extruder pinch-off.