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. 24, 2008
Filed:
Aug. 24, 2001
Kimberly a Johnson, Richmond, TX (US);
Wouter DE Jong, Amsterdam, NL;
David K. Schisla, Pleasant Prairie, WI (US);
Kimberly A Johnson, Richmond, TX (US);
Wouter de Jong, Amsterdam, NL;
David K. Schisla, Pleasant Prairie, WI (US);
Kraton Polymers US, LLC, Houston, TX (US);
Abstract
Disclosed is a method for making selectively hydrogenated block copolymers of vinyl aromatic hydrocarbons and conjugated dienes comprising: a) anionically polymerizing vinyl aromatic hydrocarbons and conjugated dienes to produce block copolymers with living chain ends; b) terminating the living chain ends; to produce a terminated block copolymer, with a member from the group consisting of an alcohol, hydrogen, and mixtures thereof, to prepare a terminated block copolymer; and c) contacting the terminated block copolymers with hydrogen at a temperature of from 20 to 175° C. in the presence of a catalyst prepared by combining a cobalt carboxylate with an aluminum alkyl, wherein: (i) if the polymer is terminated with an alcohol and the alcohol is a linear alcohol, the linear alcohol is used to terminate the living chain ends in an amount such that the alcohol:living chain end molar ratio is from 0.05 to 1.2: (ii) if the polymer is terminated with an alcohol and the alcohol is a branched alcohol, the branched alcohol is used to terminate the living chain ends in an amount such that the alcohol:living chain end molar ration is from 0.05 to about 3.0: an (iii) if the polymer is terminated with an alcohol and the alcohol is a mixture of a linear alcohol and a branched alcohol, the linear alcohol is used to terminate the living chain ends in an amount such that the linear alcohol:living chain end molar ration is from 0.05 to 1.2.