| abstract |
The present invention provides composition for treating a substrate comprising a homogeneous mixture of:(a) a fluorinated silane of the formula:wherein Rf<1 >represents a monovalent or divalent perfluorinated group, Q represents an organic divalent linking group, R<1 >represents a C1-C4 alkyl group, Y represents a hydrolysable group; x is 0 or 1 and y is 1 or 2;(b) compressed fluid carbon dioxide; and(c) optionally an organic or inorganic acid.The invention further provides a method of making such a composition and the use thereof to treat substrates to render them oil and water repellent. |