Process for producing powdery isotactic polyolefin

Details Process for producing powdery isotactic polyolefin Process for producing powdery isotactic polyolefin

1979-01-25

1981-03-24

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

252429B, 526125, 526127, 526351, 526909, C08F 402, C08F 1006

Patent

active

042581672

ABSTRACT:
A powdery isotactic polyolefin having high isotactic characteristic and high bulk density and a narrow size distribution is produced by forming a polymerization catalyst system by reacting a Grignard reagent with a chain or cyclic hydropolysiloxane having the unit ##EQU1## (R.sup.1 represents an alkyl, aryl, aralkyl, alkoxy or aryloxy group; a is 0, 1 or 2; b is 1, 2 or 3 and a+b.ltoreq.3) to form a reaction product (a); reacting the reaction product (a) with at least one compound having the formula

REFERENCES:
patent: 3907759 (1975-09-01), Okada et al.
patent: 4071672 (1978-01-01), Kashiwa
patent: 4076924 (1978-02-01), Toyota et al.
patent: 4085276 (1978-04-01), Toyota et al.
patent: 4109071 (1978-08-01), Berger et al.
patent: 4115319 (1978-09-01), Seata et al.
patent: 4143223 (1979-03-01), Toyota et al.
patent: 4168361 (1979-09-01), Oda et al.

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