Novel block copolymer of styrene and ethylene

Details Novel block copolymer of styrene and ethylene Novel block copolymer of styrene and ethylene

1990-04-20

1992-04-07

Seccuro, Carman J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525259, 525271, C08L29702, C08L29708

Patent

active

051029570

ABSTRACT:
A novel method is proposed for the preparation of a block copolymer of styrene and ethylene having a very narrow molecular weight distribution and controlled molar ratio of the styrene moiety to ethylene moiety in a high efficiency. The method comprises the steps of: (a) living-polymerizing styrene by using an organic lithium compound as a polymerization initiator; (b) admixing the polymerization mixture containing the living polymer of styrene with a tertiary diamine compound, such as N,N,N',N'-tetramethyl ethylene diamine; and (c) introducing ethylene monomer into the polymerization mixture to effect polymerization of ethylene on to the living polymer molecules of polystyrene.

REFERENCES:
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patent: 3894117 (1975-07-01), Agouri et al.
patent: 4668746 (1987-05-01), Delaney
patent: 4762893 (1988-08-01), Nocci et al.
patent: 4960842 (1990-10-01), Lo et al.

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