Fluoroalkyl-functional organosiloxane-containing compositions based on alcohol, a process for their preparation and their use

A method of protecting buildings and facades, 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:
• R1—(CH2)2Si(R2)y(OR)3−y (Ia) or
• R1—Y—(CH2)2SiHx(R2)y(OR)3−x−y (Ib),
• in 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 a CH2, O or S group, 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)≦2, at a temperature in the range of 0-120° 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 and alkylamine of formula (III):
• H3−zNRz3 (III),
• wherein R3 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 buildings and facades.

A method of silanizing fillers and pigments, 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:
• R1—(CH2)2Si(R2)y(OR)3−y (Ia) or
• R1—Y—(CH2)2SiHx(R2)y(OR)3−x−y (Ib),
• in 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 a CH2, O or S group, 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)≦2, at a temperature in the range of 0-120° C. over a period of 0.5-24 hour and with thorough mixing in an alcoholic medium which contains water and (1) a weak mono- or polybasic acid or (2) a weak base or (3) a weak mono- or polybasic acid and a weak base or (4) 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 said fillers and pigments.

A method for coating glass fibers, 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:
• R1—(CH2)2Si(R2)y(OR)3−y (Ia) or
• R1—Y—(CH2)2SiHx(R2)y(OR)3−x−y (Ib),
• in 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 group, 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)≦2, at a temperature in the range of 0-120° 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) a weak base or (3) a mono- or polybasic acid and a weak base or (4) an acidic or basic salt, the water and alkoxysilane employed being in a molar ratio of 2-500:1;
• and then
• coating the glass fibers with the prepared fluoroalkyl-functional group containing organosiloxane based composition.