STYRENE-BUTADIENE POLYMERS WITH STYRENE GRADIENT AND METHODS OF MAKING THE SAME

Title:

STYRENE-BUTADIENE POLYMERS WITH STYRENE GRADIENT AND METHODS OF MAKING THE SAME

Document Type and Number:

WIPO Patent Application WO/2009/134665

Kind Code:

A3

Abstract:

The abstract was not in accordance with PCT Rule 8 1(b) because it was more than 150 words in length The abstract has been established by this Authonty to read as follows A process for forming a polymer from styrene and 1,3-butadιene monomer units includes A) adding less than 60% of the butadiene used in the polymerization, to the total amount of styrene and solvent used in the polymeπzation in a reactor, B) adding at least one initiator, and reacting the mixture for a time t, C) adding the remaining amount of butadiene in two or more separate additions, and wherein for each butadiene addition, the amount of subsequent butadiene added is less than, or equal to, the amount of butadiene added in the immediately pπor addition, and wherein for each butadiene addition, the butadiene is added over a time, t(nc), and after each addition, reacting the mixture for a time, t(nr) wherein n is the number of the butadiene addition, and for each addition, n is at least 1.

Inventors:

HAMANN EVEMARIE (DE)
BARTOSSEK HAGEN (DE)

Application Number:

PCT/US2009/041483

Publication Date:

November 04, 2010

Filing Date:

April 23, 2009

Export Citation:

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Assignee:

STYRON EUROPE GMBH (CH)
HAMANN EVEMARIE (DE)
BARTOSSEK HAGEN (DE)

International Classes:

C08F297/04; C08F36/06; C08L53/02

Foreign References:

US20050171290A1	2005-08-04
US20080051510A1	2008-02-28
US4547560A	1985-10-15
US20030096891A1	2003-05-22

Other References: