Kraton Polymers U.S. LLC

Mark Hageman

Carl Lesley Willis

Dale Lee Handlin, Jr

Robert Charles Bening

Kimberly Ann Johnson

Harvey E Atwood

Adrie A Van Der Huizen

Henk Van De Weg

Lithium-terminated polymers of one or more conjugated dienes and of one or more mono alkenyl arenes are coupled by reaction with an alkoxy silane coupling agent having the formula R&#x2014;Si&#x2014;(OR'), where x is 0 or 1, x+y=4, R and R&#x2032; are the same or different, R is selected from aryl hydrocarbon radicals, linear alkyl hydrocarbon radicals and branched alkyl hydrocarbon radicals, and R&#x2032; is selected from linear and branched alkyl hydrocarbon radicals, such that the resulting polymer composition contains less than about ten weight percent of uncoupled polymer diblock. The polymer compositions are subsequently selectively hydrogenated, and are useful in a variety of compounds and end use applications.

Process for preparing block copolymer and resulting composition

The invention relates to a method for partially and selectively hydrogenating a polymer made of at least a conjugated diene monomer having a vinyl content of from 20 to 65%, comprising a hydrogenation step on a solution of the polymer, characterized in that the hydrogenation step is performed in the presence of an iron-containing catalyst whereby a hydrogenated polymer is obtained wherein the vinyl content is reduced to 5% or less, whereas the content of 1,4-double bonds is maintained at a level of at least 30%.

Method for partially and selectively hydrogenating polymers made of conjugated dienes

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Amsterdam, Netherlands

Mark Hageman