Manufacture of olefin polymers

Details Manufacture of olefin polymers Manufacture of olefin polymers

1977-01-21

1978-08-29

Holler, Alan

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

252430, 252451, 252452, 526106, 526352, C08F 402, C08F 424, C08F 1000

Patent

active

041105222

ABSTRACT:
A process for the manufacture of olefin polymers by polymerizing .alpha.-monoolefins of 2 to 8 carbon atoms by means of a catalyst which is obtained from a silicate carrier (component a), an organo-metallic compound containing alkoxide groups (component b) and a chromium compound (component c), wherein the catalyst employed is obtained by (1) first charging (1.1) a finely divided porous xerogel (component a) of the formula SiO.sub.2 . m Al.sub.2 O.sub.3, where m is a number from 0 to 2, with (1.2) a particular aluminum compound containing alkoxide groups (component b), (2) then charging (2.1) the product obtained from stage (1) with (2.2) a particular chromium compound (component c) by treatment with a solution of the chromium compound, with intimate mixing and evaporation of the solvent and (3) finally heating the product, obtained from stage (2), in an anhydrous stream of gas containing oxygen. This process makes it possible to influence the essential properties of the polymers in relatively diverse ways, in the desired direction, by relatively slight modifications of the catalyst.

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patent: 3947433 (1976-03-01), Witt
patent: 3956257 (1976-05-01), Hogan
patent: 3959178 (1976-05-01), Hogan
patent: 4025707 (1977-05-01), Hogan
patent: 4037042 (1977-07-01), Mueller-Tamm et al.

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