New silane cpds. used as surfactant in aq. media - comprise ether and hydrophilic gps., and are stable against hydrolysis in acid and alkali

摘要

New silanes of formula (I) are claimed. R1, R2, R3 are aliphatic or aromatic hydrocarbon gps.; R4 is 3-14C divalent hydrocarbon gp.; R5 is -O(CH2)b or a polyether residue of formula -(OCnH2n)c; b is 1-6; n has average value 2-2.5; c is 1-10; R6 is -OSO3X or -OR7; X is H, alkali or (substd.) NH4; R7 is H, 1-4C alkyl or acetyl; a is 0 or 1; and if R6 is -OR7, then a is 1. (I) are prepd. by (a) addn. of cpds. of formula (a1) to silanes of formula (a2) in presence of a hydrosilation catalyst, followed opt. by (b) sulphation of the prod. of formula (b1) and neutralisation with alkali hydroxide or NH4OH in which the H atoms on the N may be substd.. Reaction (a) is at raised temp. and/or in presence of a solvent, using a Pt catalyst. USE/ADVANTAGE - Use of (I) as surfactants in aq. media (claimed). (I) are stable against hydrolysis in acid and alkaline media. Addn. of 1% of (I) to aq. solns. lowers the surface tension to 21 mN/m.