Interim rept. no. 3, 21 Sep-20 Dec 1962
SNELL (FOSTER D) INC NEW YORK
Pagination or Media Count:
Stability in storage was found to be greater for the silicone-titanium copolymer alone or in solution in mineral spirits than with combinations of silicone-titanium copolymer and dimethyldiethoxysilane. A saturated solution of p-toluene sulfonic acid was found effective as a catalyst for the silicone-titanium copolymer alone and in solution in mineral spirits when applied to a dry panel in pre-flight application. Its stability on storage was found to be greater than that of sodium bisulfate in paste form. A re- evaluation was made of several surface active agents incorporated in acidified dimethyldiethoxysilane. Instead of quick release at 40 psi, as previously used, a gradual release at 5 psi pressure at a rate of 1 mlmin for 10 minutes was employed. No significant improvement in repellency was obtained when application was made under rain conditions.
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