Polymethyl methacrylate molding compounds

US4877853A · kind A · utility

Assignee

• Rohm Co., Ltd. · JP

Inventors

• Werner Siol · Pfungstadt, DE
• Ernst Heil · Riedstadt, DE
• Franz Wenzel · Darmstadt, DE
• Peter J. Arndt · Seeheim-Jugenheim, DE
• Ulrich Terbrack · Reinheim, DE

Key dates

• Filing date: Aug 19, 1988
• Grant date: Oct 31, 1989
• Expiry date: Aug 19, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F20/14
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A method for making a thermoplastically processable polymer by emulsion polymerizing at least 80 percent by weight of methyl methacrylate monomer with up to 20 percent by weight of at least one other monomer in an aqueous phase at a temperature from 0.degree. C. to 100.degree. C. in the presence of a polymerization initiator and a chain transfer agent in a molar ratio from 1:2 to 1:100,000, said chain transfer agent being from 0.01 to 5 percent by weight of said monomers, and then separating said polymer and said aqueous phase.