Silica-titania cogel from two-step hydrolysis

Details Silica-titania cogel from two-step hydrolysis Silica-titania cogel from two-step hydrolysis

1984-07-09

1985-10-15

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

502236, 502242, 502256, 526 96, 526130, 526352, C08F 402, C08F 1002

Patent

active

045475571

ABSTRACT:
A silica-titania cogel is produced in a two-step process wherein in the first step an alkyl polysilicate and/or a tetraalkyl silicate is partially hydrolyzed in an alkaline organic solvent using insufficient water to complete hydrolysis and thereafter a tetraalkyl titanate and an excess of water are added to complete the hydrolysis. The resulting product is as good or better than silica-titania cogels made by expensive prior art techniques and offers the advantage of not requiring washing step to remove alkali metal ions and thus also does not require an azeotrope drying step to remove water.

REFERENCES:
patent: 4006175 (1977-02-01), Termin et al.
patent: 4176089 (1979-11-01), Cull
patent: 4206297 (1980-06-01), Hoff et al.
patent: 4301034 (1981-11-01), McDaniel
patent: 4405768 (1983-09-01), McDaniel
patent: 4410501 (1983-10-01), Taramasso et al.

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