Method of preparation of porous membranes and adsorbents

Details Method of preparation of porous membranes and adsorbents Method of preparation of porous membranes and adsorbents

1982-03-23

1983-02-22

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

2105002, 521154, 528 5, 528 8, 528 9, 528 10, 528 12, 528 14, 528 16, 528 17, 528 18, 528 20, 528 21, 528 23, 528 25, 528 29, 528 31, 528 32, 528 38, 528 39, 528 41, C08J 924, C08G 7756

Patent

active

043749330

ABSTRACT:
Silicic acid heteropolycondensates made from hydrolyzable silicic acid derivatives and substituted silanes, optionally with either or both of one or more functional silanes and non-volatile metal oxides or their precursors are made by a known technique, in which the reaction mixture is hydrolyzed and condensed by the action of water and a condensation catalyst, the latter being employed in an amount up to 3% by weight, based upon the weight of the reaction mixture. Improved heteropolycondensates usable as adsorbents and porous membranes can be made by using greater amounts of catalyst, ranging up to 75% by weight, based upon the weight of the reaction mixture. These improved products are very stable in use and are characterized by a pore structure which includes fine pores and coarse pores, whereby products in the form of membranes can have an asymmetrical structure, if desired.

REFERENCES:
patent: 4238590 (1980-12-01), Scholze

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