| 摘要 |
The present invention relates to a siloxane-oxyalkylene copolymer surfactant having the formula MDxD'yM wherein M represents (CH3)3SiO1/2, or R(CH3)2SiO1/2, D represents (CH3)2SiO2/2, D' represents (CH3)RSiO2/2, and the value of x+y is from 48 and 220, and the ratio x/y is from 5 to 15 inclusive. In the above formulae for M and D', R is a polyether-containing substituent selected from the group consisting of (1) -CnH2nO(C2H4O)a(C3H6O)bR' moieties having weight average molecular weights in the range 2300-3400 and wherein n is 3-4, the ratio a/b is from 0.5 to 1.3 inclusive, R' represents hydrogen, an alkyl group of 1-4 carbon atoms or -C(O)CH3 and (2) -Cn'H2n'O(C2H4O)a'(C3H6O)b'R' moieties having weight average molecular weights in the range 750-1400 and wherein n' is 3-4, a' is a number such that the ethylene oxide residues constitute 30-100% by weight of the alkylene oxide residues of the polyether, b' is a number such that the propylene oxide residues constitute 0-70% by weight of the alkylene oxide residues of the polyether, R' represents hydrogen, an alkyl group of 1-4 carbon atoms or -C(O)CH3, and the blend average molecular weight of the overall polyether-containing substituents R in the compositions is in the range from 1500 to 2200 and the overall EO/PO molar ratio ranges from 0.65 to 1.2. The siloxane-oxyalkylene copolymer surfactants are useful in producing flexible polyurethane slabstock foams.
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