Patent ID: 8044109

Claim:
A polyurethane foam obtained from a foam forming composition comprising a silicone copolymer surfactant having the formula: MD x D′ y M, wherein, M represents (CH 3 ) 3 SiO 1/2 , or (CH 3 ) 2 RSiO 1/2 D represents (CH 3 ) 2 SiO 2/2 , D′ represents (CH 3 )RSiO 2/2 , x+y is 50 to 150; y is at least 3; the ratio of x to y is 3 to 15; and R is a polyether independently selected from the group consisting of: i) at least one polyoxyalkylene moiety having the formula: —C n H 2n O(C 2 H 4 O) a (C 3 H 6 O) b R′ and possessing a number average molecular weight from 2,300 to 5,500, wherein n is 2 to 4, a is a number such that the oxyethylene residue constitute 20 to 60 percent by the weight of the alkylene oxide residues of the polyoxyalkylene polyether, b is a number such that the propylene oxide residue constitute 80 to 40 percent by the weight of the alkylene oxide residues of the polyoxyalkylene polyether, and R′ represents an alkyl group having 1 to 4 carbon atoms or —C(O)CH 3 ; ii) at least one polyoxyalkylene moiety having the formula: —C n′ H 2n′ O(C 2 H 4 O) a′ (C 3 H 6 O) b′ R″ and possessing a number average molecular weight from 800 to 2,200, wherein n′ is 2 to 4, a′ is a number such that the oxyethylene residues constitute 20 to 60 percent by weight of the alkylene oxide residues of the polyoxyalkylene polyether, b′ is a number such that the propylene oxide residue constitute 80 to 40 percent by the weight of the alkylene oxide residues of the polyoxyalkylene polyether, and R″ represents an alkyl group having 1 to 4 carbon atoms or —C(O)CH 3 ; and, iii) at least one polyoxyalkylene moiety having the formula: —C n″ H 2n″ O(C 2 H 4 O) a″ (C 3 H 6 O) b″ H and possessing a number average molecular weight of 1,400 to 2,300, n″ is 2 to 4, a″ is a number such that the oxyethylene residues constitute 20 to 60 percent by weight of the alkylene oxide residues of the polyoxyalkylene polyether, and b″ is a number such that the propylene oxide residue constitute 80 to 40 percent by the weight of the alkylene oxide residues of the polyoxyalkylene polyether, with the proviso that MD x D′ y M has at least one each of components (i), (ii), and (iii), where the blend number average molecular weight of the overall polyoxyalkylene polyethyer containing substitutents R in the composition is from 2,050 to 2,350 and component (iii) constitutes 10 to 60 mole percent of the total amount of polyether.