Aqueous coating solution for abrasion-resistant SiO2...

Details Aqueous coating solution for abrasion-resistant SiO2... Aqueous coating solution for abrasion-resistant SiO2...

2005-07-19

2005-07-19

Moore, Margaret G. (Department: 1712)

Compositions: coating or plastic

Coating or plastic compositions

Silicon dioxide containing

Reexamination Certificate

active

06918957

ABSTRACT:
Aqueous coating solution having a pH of from 3 to 8, comprising 0.5-5.0% by weight of [SiOx(OH)y]nparticles, where 0<y<4 and 0<x<2, having a particle size of from 10 nm to 60 nm with a tolerance of ±10%, and from 0.005 to 0.5% by weight, based on the coating solution, of a surfactant mixture obtainable by hydrolytic polycondensation of tetraalkoxysilanes in an aqueous-alcoholic-ammoniacal medium at temperatures between 35° C. and 80° C., with subsequent removal of ammonia and alcohol from the resultant dispersion by steam distillation and subsequent addition of a surfactant mixture comprising 15-30% by weight of anionic surfactants, 5-15% by weight of nonionic surfactants and less than 5% by weight of amphoteric surfactants.

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