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. 16, 2001
Filed:
Dec. 10, 1998
Applicant:
Inventors:
Christof Mehler, Ludwigshafen, DE;
Thieo E. Hogen-Esch, South Pasadena, CA (US);
Axel Müller, Wiesbaden, DE;
Angela Zagala, Aurora, IL (US);
Assignee:
BASF Aktiengesellschaft, Ludwigshafen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C00F 4/06 ;
U.S. Cl.
CPC ...
C00F 4/06 ;
Abstract
The present invention concerns a novel method for preparing polymers (preferably (meth)acrylate polymers and copolymers) having a narrow molecular weight distribution by metal-free anionic polymerization in the presence of a phosphonium salt of a nitrogen, oxygen and/or sulfur anion. The present invention also concerns block copolymer and methods of making the same using anionic polymerization in the presence of the phosphonium salt to prepare at least one block of the copolymer.