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:
Mar. 07, 2006
Filed:
Jul. 11, 2003
Robert Bening, Katy, TX (US);
Harvey Atwood, Kingwood, TX (US);
Marinus Pieter Van Dijk, Amsterdam, NL;
Adriana Maria Petronella Ros, Amsterdam, NL;
Barry Moore, Cypress, TX (US);
Carl Willis, Houston, TX (US);
Nikolaas Jan Van Dijk, Amsterdam, NL;
Robert Bening, Katy, TX (US);
Harvey Atwood, Kingwood, TX (US);
Marinus Pieter van Dijk, Amsterdam, NL;
Adriana Maria Petronella Ros, Amsterdam, NL;
Barry Moore, Cypress, TX (US);
Carl Willis, Houston, TX (US);
Nikolaas Jan van Dijk, Amsterdam, NL;
Kraton Polymers U.S. LLC, Houston, TX (US);
Abstract
Disclosed is an improvement to a process for preparing coupled styrenic block copolymers wherein adding from about 0.01 to about 1.5 equivalents of a metal alkyl compound per equivalent of living polymer chain ends to the cement, during or after polymerization, improves coupling efficiencies. The resultant radial styrenic block copolymers have reduced amounts of 5+ arm oligomers which can be very desirable is certain applications, such as the modification of bitumen.