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. 29, 1993
Filed:
Dec. 11, 1992
Ernst Grigat, Leverkusen, DE;
Wolfgang Ebert, Krefeld, DE;
Burkhard Kohler, Krefeld, DE;
Wolfgang Beer, Krefeld, DE;
Ralf Dujardin, Willich-Anrath, DE;
Klaus Horn, Krefeld, DE;
Bayer Aktiengesellschaft, Leverkusen, DE;
Abstract
A method of foaming thermoplastic aromatic polycarbonates is disclosed. Accordingly, a polycarbonate resin is mixed with 0.01 to 10%, the percent being relative to the total weight of polycarbonate resin and polysaccharide, of a particular polysaccharide and the mixture then processed thermoplastically without the application of negative pressure in an extruder, at temperatures of 180.degree. C. to 320.degree. C., or in an injection molding machine, at temperatures of 190.degree. C. to 330.degree. C., to obtain foamed molded articles.