Basic liquid composition suitable for producing transparent coatings or varnishes on solid surfaces, process for preparation of such varnishes, and varnishes produced thereby
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United States of America Patent
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Nov 27, 1984
Grant Date -
N/A
app pub date -
Mar 8, 1983
filing date -
Mar 16, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The basic composition comprises, in solution in at least one organic solvent, with or without water, from 10 to 40% of a hard-enable organosilicic compound resulting from a first hydrolysis reaction achieved at a temperature lower than 50.degree. C. in the presence of a carboxylic acid and water on at least one R'Si(OR).sub.4 alkoxysilane with n=1 or 2, in association or without association with at least one Si(OR').sub.4 -alkoxysilane, then, a second hydrolysis at a temperature lower than 40.degree. C. after removal of the formed volatile solvents and addition of a less volatile solvent and at least one R''Si(OR.sub.1).sub.3 -alkoxysilane, said reaction being followed with the setting of the pH to between 3.5 and 5.5 by an organic base.
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