Manufacture of olefin polymers

Details Manufacture of olefin polymers Manufacture of olefin polymers

1976-09-02

1977-07-19

Holler, Alan

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

423338, 423339, 526352, C08F 402, C08F 424, C08F 1000, C08F 1002

Patent

active

040370429

ABSTRACT:
A process for the manufacture of olefin polymers by polymerization of .alpha.-monoolefins by means of a silicic acid xerogel/chromium trioxide catalyst, which is obtained by a method wherein (1) a finely divided silicic acid xerogel is first manufactured by (1.1) employing a silicic acid hydrogel of relatively high solids content, (1.2) extracting at least 60% of the water contained in the hydrogel from the latter by means of a particular organic liquid, (1.3) drying the gel thus obtained until there is no further loss in weight (xerogel formation) and (1.4) reducing the xerogel thus obtained to particles of diameter from 20 to 2,000 .mu.m,

REFERENCES:
patent: 3862104 (1975-01-01), Witt
patent: 3870656 (1975-03-01), Brown et al.
patent: 3900457 (1975-08-01), Witt
patent: 3960826 (1976-06-01), Aboutboul et al.
Chem. Abstracts, 77, 166765t (1972).

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