Crystalline olefin block polymers and their preparation

Details Crystalline olefin block polymers and their preparation Crystalline olefin block polymers and their preparation

1975-03-18

1981-11-17

Michl, Paul R.

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

Synthetic resins

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

525321, 525323, C08F29708

Patent

active

043012566

ABSTRACT:
Substantially crystalline block polymers comprising a homo-polymer block of an alpha-olefin having 2-8 carbon atoms and attached thereto a copolymer block of at least 2 alpha-olefins containing 2-2 carbon atoms, one of which may be the same or different from the alpha-olefin from which the homo-polymer block is prepared. Such block polymers are prepared in the presence of a stereospecific catalyst system by contacting the aforesaid alpha-olefin with said catalyst system to form the solid, substantially crystalline homo-polymer block, and then contacting the same catalyst system with the aforesaid mixture of said alpha-olefins. In an embodiment between about 55 and 95% of the polymerization time is expended in preparing the homo-polymer block. When preparing the copolymer block, one uses at least as much of the least reactive alpha-olefin, or more of the same, as one uses of the more reactive monomers.

REFERENCES:
patent: 3318976 (1967-05-01), Short
patent: 3970719 (1976-07-01), Edmonds
patent: 4039632 (1977-08-01), Edmonds

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