| abstract |
The invention provides partially endcapped polyether siloxanes, and their use as foam stabilizers. Generally, the polyether siloxanes are of formula (I), R-Si (CH3)2-O- [-Si (CH3)2-O- ] n- [-Si (CH3) R1-O-]m-Si (CH3)2-R2 where R, R1 and R2 are the same or different, R and/or R2 are methyl or R1, R1 is the same or different and represents -(CH2)x-(O)z-(CH2-CHR'-O)y-R", where the (CH2-CHR'-O) units can be the same or different, R is the same or different and represents -H, -CH3, -CH2CH3 or phenyl, R" is the same or different and represents -H, -(CO)-R"',-(CO)-NH-R"' or -alkyl, is the same or different and represents C1 to C40-alkyl, -aryl or -alkylaryl, n + m + 2 = 10 to 150, m = 0 to 20, y = 1 to 40, z = 0 or 1. On average, 10 to 90 mol% of the R" radicals are not hydrogen radicals, and the remaining proportions of the R" radicals are hydrogen atoms. |