Polymerization using a support formed by heating silica gel in i

Details Polymerization using a support formed by heating silica gel in i Polymerization using a support formed by heating silica gel in i

1982-09-27

1984-03-13

Levin, Stanford M.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

502233, 502242, 502256, 526352, C08F 402, C08F 424

Patent

active

044368836

ABSTRACT:
A silica hydrogel is contacted with a hydroxy-containing organic compound which is not completely miscible with water but which is sufficiently miscible with water so as to remove water, and thereafter the organic compound is removed by heating in an inert atmosphere prior to activation by heating in air. The heating in the inert atmosphere allows utilizing preferred organic compounds such as C.sub.5 and C.sub.6 alcohols which are desirable from a commercial standpoint because of the easy separation for recycle. In a preferred embodiment, the hydrogel is aged at a pH of 7 to 9 by means of either adding a base or by utilizing a chromium component containing bound nitrogen.

REFERENCES:
patent: 3887494 (1975-06-01), Dietz
patent: 4081407 (1978-03-01), Short et al.
patent: 4151122 (1979-04-01), McDaniel et al.
patent: 4247421 (1981-01-01), McDaniel et al.

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