Three-block copolymers and method for producing them

Details Three-block copolymers and method for producing them Three-block copolymers and method for producing them

1978-11-29

1981-04-14

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...

525244, 525319, 525367, C08F29700

Patent

active

042620953

ABSTRACT:
Three-block copolymers of the ABA and ABC type are disclosed in which A and C are plastomeric monomers and B is an elastomeric polymer are disclosed, which are prepared by first polymerizing the block A in such a way to keep alive the active centers in the chain ends for a time sufficient to permit the addition of the second monomer B, whereafter, with the aid of a special catalytic system, the growth of the third block C, can be carried out. A and C are mutually interchangeable. The catalyst for polymerizing the block A is a Lewis' acid aided by isobutene and the catalyst for introducing and copolymerizing C (or A) is a chloride of aluminium alkyl.

REFERENCES:
patent: 3265765 (1966-08-01), Holden et al.
patent: 3649579 (1972-03-01), Gobran et al.
patent: 3699190 (1972-10-01), Shimomura
patent: 3911054 (1975-10-01), Roest et al.
patent: 3980736 (1976-09-01), Agouri et al.
patent: 4088813 (1978-05-01), Willis

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