Compositions – Preservative agents – Anti-corrosion
Patent
1997-02-20
1998-09-15
Lovering, Richard D.
Compositions
Preservative agents
Anti-corrosion
106490, 252 62, 252314, 427219, 428405, 501 12, B01J 1300, C04B 1404
Patent
active
058075011
ABSTRACT:
The present invention is neutral-aged hydrophobic organosilicate-modified silica gels and a method for their preparation. The method comprises three steps, where in the first step an organosilicate-modified silica hydrosol is contacted with a strong mineral acid at a pH less than about 1 to form an organosilicate-modified silica hydrogel. In the second step the organosilicate-modified silica hydrogel is aged at a pH within a range of about pH 3.5 to pH 8. In the third step the neutral-aged organosilicate-modified silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the organosilicate-modified silica hydrogel to form a hydrophobic organosilicate-modified silica hydrogel having a surface area within a range of about 100 m.sup.2 /g to 750 m.sup.2 /g in the dry state. In a preferred process the hydrophobic organosilicate-modified silica hydrogel is contacted with a sufficient quantity of a water-immiscible organic solvent to convert the hydrophobic organosilicate-modified silica hydrogel into a hydrophobic organosilicate-modified silica organogel.
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Burns Gary Thomas
Deng Qin
Hahn James Richard
Reese Clifford Carlton
Boley William F.
Dow Corning Corporation
Lovering Richard D.
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