Patent ID: 6177582
Filing Date: 2001-01-23
Classification: C03C,C08G,C09D,C09K,D06M,D21H

Abstract:
An alcoholic fluoroalkyl-functional group containing organosiloxane based composition, which is essentially chlorine free, prepared by the controlled hydrolysis of organosiloxane material consisting essentially of at least one fluoroalkyl-functional group containing organosilane selected from the group consisting of organosilanes of formula Ia or Ib:R.sup.1 --(CH.sub.2).sub.2 Si(R.sup.2).sub.y (OR).sub.3-y (Ia)orR.sup.1 --Y--(CH.sub.2).sub.2 SiH.sub.x (OR).sub.3-x-y (Ib),in which R.sup.1 is a mono-, oligo- or perfluorinated alkyl group having 1-9 C atoms or a mono-, oligo- or perfluorinated aryl group, Y is a CH.sub.2, O or S group, R.sup.2 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).ltoreq.2, at a temperature in the range of 0-120.degree. C. over a period of 0.5-24 hours and with thorough mixing in an alcoholic medium which contains water and:(1) a weak mono- or polybasic acid, or(2) an alkyl amine as the weak base of formula (III):H.sub.3-z NR.sub.a.sup.3 (III),wherein R.sup.3 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 R.sup.3 are identical or different, or(3) a weak mono- or polybasic acid and a weak base of formula (III), or(4) an acidic or basic salt, where the water and alkoxysilane employed are in a molar ratio of 2-500: 1.