Stamicarbon B.v.

Stamicarbon N.v.

Bernard C Roest

Herman A Schepers

Polyfunctional anionic initiators for the preparation of elastomeric block copolymers are prepared by reacting a monofunctional anionic initiator, such as secondary butyl lithium, with a monovinyl aromatic compound, such as styrene, or a conjugated diene, such as butadiene or isoprene or mixtures thereof to form a polyuric reaction product which in turn, is reacted with a polyvinyl aromatic compound, such as divinyl benzene. The cross-linked reaction product, prior to use, is reacted with styrene or another monovinyl aromatic compound. The resulting polyfunctional anionic initiators are useful in producing elastomeric block co-polymers of the A-B-(A)n type exhibiting good elastomeric properties.

Process for the preparation of thermoplastic elastomeric block copolymers

A method for preparing a block polymer A--B--C with alkyl lithium where the improvement is in the formation of block B. The method of forming block B which is a conjugated diene is carried out without the removal of contaminants.

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Geleen, Netherlands

Bernard C Roest