Process of producing hydrophobic organosilica sol

Details Process of producing hydrophobic organosilica sol Process of producing hydrophobic organosilica sol

1998-05-26

2000-02-15

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528490, 252309, 10628716, 10628712, C08G 7700

Patent

active

060254556

ABSTRACT:
A process of producing a hydrophobic organosilica sol which comprises aging a reaction mixture at 0 to 100.degree. C. in the state that an alkali present in the reaction mixture is removed or is neutralized with an acid in an equivalent amount or more, thereby forming a silylation-treated silica sol having a hydrophobic colloidal silica dispersed therein, the reaction mixture comprising: (a) a hydrophilic colloidal silica having a specific surface area of 5.5 to 550 m.sup.2 /g in SiO.sub.2 concentration of 5 to 55% by weight, (b) a silylating agent of a disiloxane compound and/or monoalkoxysilane compound in a millimolar ratio of 0.03 to 2 in terms of Si atom per 100 m.sup.2 of a surface of the hydrophilic colloidal silica, and (c) a medium, as a residue thereof, comprising a mixed solvent comprising a hydrophobic organic solvent having a solubility of water of 0.1 to 12% by weight and an alcohol having 1 to 3 carbon atoms in a weight ratio of 0.05 to 20 to the hydrophobic organic solvent, and water in an amount of 15% by weight or less based on the weight of the medium.

REFERENCES:
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patent: 2786042 (1957-03-01), Iler
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patent: 5185037 (1993-02-01), Kaijou
patent: 5651921 (1997-07-01), Kaijou
patent: 5856379 (1999-01-01), Shiratsuchi et al.

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