James M Burlitch

US Patent:

51530317, Oct 6, 1992

Filed:

Nov 14, 1990

Appl. No.:

7/612477

Inventors:

James M. Burlitch - Ithaca NY

Assignee:

Cornell Research Foundation, Inc. - Ithaca NY

International Classification:

B05D 302
C04B 3502

US Classification:

427226

Abstract:

Stable magnesium containing silicate sols are produced by preparing a solution of silicon alkoxide and of magnesium alkoxide and optionally of aluminum alkoxide in solvent wherein the atomic ratio of Mg to Si ranges from 0. 3:1 to 4:1 and simultaneously reacting said alkoxides with peroxy compound or peroxy compound and water. Water presence, rate of addition of reactant, quantity of solvent and temperature of reaction are controlled to negate formation of precipitate. For a magnesium silicate sol, preferably the silicon alkoxide is tetraethylorthosilicate, the magnesium alkoxide is magnesium methoxide, the solvent is methanol and 30% H. sub. 2 O. sub. 2 is used as a reactant. For a magnesium aluminosilicate sol, preferably the silicon alkoxide is tetraethylorthosilicate, the magnesium alkoxide is selected from the group consisting of magnesium-s-butoxide and magnesium-2-(2'-methoxyethoxy)ethoxide, the aluminum alkoxide is aluminum isopropoxide, the solvent is sec-butanol and 2-(2'-methoxyethoxy)ethanol and 30% H. sub. 2 O. sub. 2 is used as a reactant. A magnesium silicate sol containing unreacted alkoxy can be reacted with HF to produce a magnesium fluoride silicate sol.

US Patent:

50192930, May 28, 1991

Filed:

Jun 12, 1989

Appl. No.:

7/364106

Inventors:

James M. Burlitch - Ithaca NY

Assignee:

Cornell Research Foundation, Inc. - Ithaca NY

International Classification:

B01J 1300
C04B 3520

US Classification:

2523131

Abstract:

Stable magnesium containing silicate sols are produced by preparing a solution of silicon alkoxide and of magnesium alkoxide and optionally of aluminum alkoxide in solvent wherein the atomic ratio of Mg to Si ranges from 0. 3:1 to 4:1 and simultaneously reacting said alkoxides with peroxy compound or peroxy compound and water. Water presence, rate of addition of reactant, quantity of solvent and temperature of reaction are controlled to negate formation of precipitate. For a magnesium silicate sol, preferably the silicon alkoxide is tetraethylorthosilicate, the magnesium alkoxide is magnesium methoxide, the solvent is methanol and 30% H. sub. 2 O. sub. 2 is used as a reactant. For a magnesium aluminosilicate sol, preferably the silicon alkoxide is tetraethylorthosilicate, the magnesium alkoxide is selected from the group consisting of magnesium-s-butoxide and magnesium-2-(2'-methoxyethoxy)ethoxide, the aluminum alkoxide is aluminum isopropoxide, the solvent is sec-butanol and 2-(2'-methoxyethoxy)ethanol and 30% H. sub. 2 O. sub. 2 is used as a reactant. A magnesium silicate sol containing unreacted alkoxy can be reacted with HF to produce a magnesium fluoride silicate sol.