elf-cleaning benefits to wide variety of porous and nonporous materials such as plastics, wood, metal, textiles; made from concentrate of hydrophobicized silica volatile solution with a disilazane derivative, and under high shear conditionsUS200200282886 Apr 20017 Mar 2002The Procter & Gamble CompanyLong lasting coatings for modifying hard surfaces and processes for applying the sameUS200200486791