Process for decolorizing of polymers of the vinylaromatic-conjugated diene type
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United States of America Patent
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Oct 31, 1989
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N/A
app pub date -
Sep 20, 1988
filing date -
Sep 21, 1987
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Expired
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Abstract
Vinyl aromatic-conjugated diene copolymers having polymer chains which end with an alkali metal and which are obtained by the polymerization in solution of at least one vinyl aromatic hydrocarbon and of a conjugated diene in the presence of a catalyst based on an alkali metal are decolorized by treating the copolymer with a monocarboxylic acid of general formula (Y).sub.2-n --X--(R--COOH).sub.n in which X is S, S--CH.sub.2 --S, or S--S, and Y and R are alkyl radicals having 1 to 16 carbon atoms and n is 1 or 2.
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