Patent ID: 7319119

Claim:
A process for treating leather or sizing paper, leather and paper being a substrate, comprising contacting the surface of said substrate with an oil-in-water emulsion, comprising (i) 100 parts by weight of a polydimethylsiloxane (P) having aminoalkyl groups and having an amine number of at least 0.1 meq/g of polydimethylsiloxane (P), and comprising units of the formula I R 1 a R 2 b SiO (4−a−b/2) (I), in which R 1 are optionally halogen-substituted alkyl radicals having 1-40 carbon atoms, or are —OR or —OH radicals, R are optionally halogen-substituted alkyl radicals having 1-40 carbon atoms, R 2 are aminoalkyl radicals of the formula II —R 3 —NR 4 R 5 (II), R 3 are divalent hydrocarbon radicals having 1-40 carbon atoms, R 4 are monovalent hydrocarbon radicals having 1-40 carbon atoms or are H, R 5 is a radical of the formula III —(R 6 —NR 4 ) x R 4 (III), R 6 is a divalent radical of the formula IV —(CR 4 R 4 —) y (IV), x is 0 or a value from 1 to 40, y is 1 or 2, a is 0, 1, 2 or 3, b is 0, 1, 2 or 3 and a+b on average is from 1.5 to 2.5, not more than 9 mol % of the radical R 1 being OH or OR, (ii) at least one MQ silicone resin, (iii) at least one protonating agent, (iv) water, and (v) not more than 5 parts by weight of emulsifier(s), and drying the substrate.