Manufacture of olefin polymers

Details Manufacture of olefin polymers Manufacture of olefin polymers

1976-02-13

1977-09-13

Holler, Alan

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

252451, 423327, 423329, C08F 402, C08F 424

Patent

active

040484149

ABSTRACT:
A process for the manufacture of olefin polymers by polymerization of monoolefins using a silicic xerogel/chromium trioxide catalyst obtained by (1) synthesizing a particulate silicic xerogel, (2) doping said xerogel with chromium trioxide or a chromium compound capable of converting to chromium trioxide under the conditions of stage (3) and (3) heating the resulting product in a gas stream containing oxygen. The silicic xerogel/chromium trioxide catalyst used is one which has been obtained by (1) synthesizing the silicic xerogel in the first stage by (1.1) starting with a silicic hydrogel having a relatively high solids content, (1.2) extracting water from said hydrogel by means of an alkanol and/or alkanone until the organic liquid absorbs no further water, (1.3) extracting the organic liquid used in stage (1.2) from the resulting dehydrated gel saturated with said organic liquid by means of a hydrocarbon or oxohydrocarbon until said hydrocarbon or oxohydrocarbon absorbs no further organic liquid from stage (1.2), and (1.4) drying the resulting dehydrated gel saturated with hydrocarbon or oxohydrocarbon (xerogel formation), and (2) doping said xerogel in the second stage with the desired amount of chromium from a solution of chromium trioxide in an alkanone or solution of a chromium compound capable of converting to chromium trioxide under the conditions of stage (3) in an alkanol or alkanone with evaporation of the solvent.

REFERENCES:
patent: 3127370 (1964-03-01), Head
patent: 3225023 (1965-12-01), Hogan et al.
patent: 3434912 (1969-03-01), Peri
patent: 3624063 (1971-11-01), Witt
patent: 3900457 (1975-08-01), Witt

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