Patent ID: 6713186
Filing Date: 2004-03-30
Classification: C03C,C08G,C09D,C09K,D06M,D21H,Y10T

Abstract:
A method of hydrophobizing and oleophobizing and for simultaneously providing a dirt- and color-repellent treatment of surfaces, of plastics, of metal, of textiles, leather, cellulose and starch products, and of mineral building materials, comprising:preparing a fluoroalkyl-functional group containing organosiloxane based composition, which is essentially chlorine free, by the controlled hydrolysis of at least one fluoroalkyl-functional group containing organosilane of formula Ia or Ib: R1â€”(CH2)2Si(R2)y(OR)3âˆ’yâ€ƒâ€ƒ(Ia) or R1â€”Yâ€”(CH2)2SiHx(R2)y(OR)3âˆ’xâˆ’yâ€ƒâ€ƒ(Ib), â€ƒin which R1 is a mono-, oligo- or perfluorinated alkyl group having 1-9 C atoms or a mono-, oligo- or perfluorinated aryl group, Y is CH2, O or S groups, R2 and R are each independently a linear, branched or cyclic alkyl group having 1-8 C atoms or an aryl group and x=0, 1 or 2 and y=0, 1 or 2, where (x+y)&lE;2, at a temperature in the range of 0-120Â° C. over a period of 0.5-24 hours and with thorough mixing in an alcoholic medium which contains water and (1) a weak base or (2) a weak mono- or polybasic acid and a weak base, wherein said weak base of (1) and (2) is an alkylamine of formula(III): H3âˆ’zNRz3â€ƒâ€ƒ(III), â€ƒwherein R3 is a linear, branched or cyclic alkyl group having 1-8 C atoms or a linear, branched or cyclic aminoalkyl group having 1-8 C atoms or an aryl group, z=1, 2 or 3 and groups R3 are identical or different, or (3) an acidic or basic salt, the water and alkoxysilane employed being in a molar ratio of 2-500:1; and then applying the prepared fluoroalkyl-functional group containing organosiloxane based composition to such materials.