Method for preparing flexible polyurethane foams

Details Method for preparing flexible polyurethane foams Method for preparing flexible polyurethane foams

1997-08-27

1998-09-15

Gorr, Rachel

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521155, C08J 900

Patent

active

058079033

ABSTRACT:
This invention relates to a method for preparing a flexible polyurethane slabstock foam by reacting a polyol, an organic diisocyanate, and water in the presence of at least one urethane catalyst, a siloxane-oxyalkylene copolymer surfactant and, optionally another blowing agent, where the surfactant has the average formula MD.sub.x D'.sub.y M where M is (CH.sub.3).sub.3 SiO.sub.1/2 or R(CH.sub.3).sub.2 SiO.sub.1/2, D is (CH.sub.3).sub.2 SiO.sub.2/2, D' is (CH.sub.3)RSiO.sub.2/2, and the value of x+y is 48 to 220, the ratio x/y is 5 to 15 inclusive, 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' group 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)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' group 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)CH.sub.3, and the blend average molecular weight of the overall polyether-containing substituents R in the surfactant is in the range from 1500 to 2200 and the EO/PO molar ratio ranges from 0.65 to 1.2.

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