Silicone polyether surfactants

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...

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252351, 528 25, 528 29, 528 31, 556445, C08G 1802

Patent

active

059816139

ABSTRACT:
The present invention relates to a siloxane-oxyalkylene copolymer surfactant having the formula MD.sub.x D'.sub.y M wherein M represents (CH.sub.3).sub.3 SiO.sub.1/2 or R(CH.sub.3).sub.2 SiO.sub.1/2, D represents (CH.sub.3).sub.2 SiO.sub.2/2, D' represents (CH.sub.3)RSiO.sub.2/2, 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)--C.sub.n H.sub.2n O(C.sub.2 H.sub.4 O).sub.a (C.sub.3 H.sub.6 O).sub.b R' moieties having weight average molecular weights of from about 2300-3200 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)CH.sub.3 and (2)--C.sub.n' H.sub.2n' O(C.sub.2 H.sub.4 O).sub.a' (C.sub.3 H.sub.6 O).sub.b' R' moieties having weight average molecular weights of from about 1150-1400 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)CH.sub.3, and the blend average molecular weight of the overall polyether-containing substituents R in the compositions is from about 1500 to 2200 and the overall EO/PO molar ratio is from about 0.65 to 1.2. The siloxane-oxyalkylene copolymer surfactants are useful in producing flexible polyurethane slabstock foams.

REFERENCES:
patent: 3980688 (1976-09-01), Litteral et al.
patent: 4147847 (1979-04-01), Schweiger
patent: 4855379 (1989-08-01), Budnick et al.
patent: 5145879 (1992-09-01), Budnik et al.
patent: 5432206 (1995-07-01), Stanga et al.
patent: 5489617 (1996-02-01), Miller et al.

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