Process for decolorizing vinyl aromatic conjugated diene copolymers
AssigneeFina Research, S.A.
InventorsEmmanuel Lanza, Jean Naveau
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Abstract
A process for eliminating color from vinyl aromatic/conjugated diene copolymers which process comprises treating the copolymers with a monocarboxylic acid having general formula R—COOH, where R is a hydrocarbon radical comprising 2 to 4 carbon atoms and R further comprises linear or branched aliphatic radicals, cycloaliphatic radicals, alkenic radicals, aromatic radicals or alkylaromatic radicals.
Claims9
A process for decolorizing vinyl aromatic/conjugated diene copolymers which have polymer chains which end with an alkali metal and are obtained by solution polymerization of at least one vinyl aromatic hydrocarbon and a conjugated diene in the presence of a catalyst based on an alkali metal, comprising treating the copolymer with a monocarboxylic acid having the general formula R—COOH, where R is a hydrocarbon radical comprising 2 to 4 carbon atoms comprising linear or branched aliphatic radicals, cycloaliphatic radicals or alkenic radicals, and said monocarboxylic acid is used in the amount of 0.02 to 2 parts per 100 parts of copolymer.
Dependencies are inferred from the claim text.