Vinyl aromatic/conjugated diene block copolymers deactivated to alkali metal-alcoholate termination and treated with cyclic anhydride
AssigneeFina Research, S.A.
InventorsEmmanuel Lanza, Jean Naveau
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Abstract
The present invention related to a process for the treatment of vinyl aromatic/conjugated diene block copolymers. More particularly, the present invention relates to a process for the treatment of such copolymers obtained starting from a (co)polymerization-initiating stage performed by means of alkaline based catalysts (Me), deactivated in such a way that they show a termination of the alkali metal-alcoholate type (--O--Me), and treated with a cyclic anhydride of polycarboxylic acid, and optically a C.sub.2 -C.sub.4 monocarboxylic acid.
Claims8
A process for producing vinyl aromatic conjugated diene copolymers, the process consisting essentially of an initiation stage in which vinyl aromatic/conjugated diene block copolymers are formed from vinyl aromatic monomers and conjugated diene monomers using alkali-metal based catalysts (Me);
- a deactivation stage in which the copolymers are deactivated by using at least one deactivating agent in such a way that the copolymers have alkali metal-alcoholate terminations (--O--Me);
- treating the copolymer with at least one cyclic anhydride of polycarboxylic acid;
- and thereafter recovering the cyclic anhydride-treated copolymer.
Dependencies are inferred from the claim text.