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A rain repellent Formula 2911K-394, was developed, and is packaged in aerosol containers. Spraying of the repellent into the windstream hitting the windshield under rain conditions forms a coating which provides visibility. Application of the repellent to a dry panel and treatment with a solution of p- toluene sulfonic acid in alcohol results in a film having good life when subjected to rain spray and resistance to both jet fuel and isopropyl alcohol. The use of 10 centistoke methyl silicone oil, as contained in Formula 2911K-394, produces a film having improved resistance to jet fuel.

A reaction mechanism is provided for formation and utilization of silicone-titanium copolymer H. The use of heated air on the rain spray apparatus did not result in increased durability of formulations containing silicone-titanium copolymer H. A new rain spray apparatus is under construction which is designed to deliver a more uniform rain spray and allow the use of larger test panels. In the preparation of silicone-zirconium copolymers reaction at a temperature of 138-140 C. results in a clear liquid yielding a dry, waxy film, whereas reaction at 105 C. results in a cloudy liquid giving a soft and tacky film. (Author)

The rin spray apparatus ws modified to permit evaluation of rain repellent formulations applied during rain conditions. Means were provided to deliver the rain s ray and the spray of the repellent solutions simultaneously. The use of surfactans incorporated in acidified dimethyldiethoxysilane did not improve repellency during rain conditions. The use of Ti in ester form alone and in conjunction with slane and silicones makes possble the formation of coaings on glass under ain conditions which permit visibility, but have shot life. (Author)

A high wind speed rain spray tester was constructed to replace the AN-R-24 rain spray test apparatus used in previous work. The durability of a number of rain repellent formulations whose life on the AN-R-24 test apparatus had been determined was evaluated on the new machine. Investigation of the action of colloidal silica and other finely divided powders in combination with silicone oils resulted in formulations which show improved repellency particularly after exposure to heat. (Author)

A formulation based on acidified dimethyldiethoxysilane dissolved in n-hexyl ether and combined with silicone oil has good rain repellent properties and an increased flash point. Its proper utilization in an aerosol package requires further investigation. A formulation based on acidified dimethyldiethoxysilane is stable to temperatures of -10 and 160 F. It withstands temper tures of -65 and 500 F after application. Its films are resistant to isopropyl alcohol. (Author)