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:
Aug. 06, 2019
Filed:
Dec. 07, 2017
Applicant:
Covestro Deutschland Ag, Leverkusen, DE;
Inventors:
Karl-Heinz Köhler, Aachen-Brand, DE;
Franky Bruynseels, Sint Gillis-Waas, BE;
Assignee:
Covestro Deutschland AG, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 64/06 (2006.01); C08G 64/24 (2006.01); C08L 69/00 (2006.01);
U.S. Cl.
CPC ...
C08G 64/06 (2013.01); C08G 64/24 (2013.01); C08L 69/00 (2013.01);
Abstract
The invention relates to aromatic polycarbonates which comprise dioxydiarylcycloalkane structural units, and which have improved optical and thermal properties. It also relates to an improved process to produce the said polycarbonates from dihydroxydiphenylcycloalkanes, and also to mixtures of these polycarbonates with polymers, with fillers, with dyes and with conventional additives.