Patent ID: 6586487
Filing Date: 2003-07-01
Classification: C08G

Abstract:
A method for making an energy-absorbing foam having a density that is less than about 7 pcf comprising the steps of reacting:(a) a polylsocyanate component comprising a member selected from the group consisting of polymeric diphenylmethane diisocyanate, mixtures of polymeric diphenylmethane diisocyanate and diphenylmethane diisocyanate, mixtures of polymeric diphenylmethane dilsocyanate and allophanate-modified diphenylmethane diisocyanate; with (b) a polyol component comprising (1) from about 12 to about 45 parts by weight of a diol having a molecular weight that is less than 300; (2) a crosslinker component having a functionality that is greater than 2, a molecular weight ranging from about 92 to about 1000, wherein the OH equivalent of the diol to the OH equivalent of the crosslinker is from about 1 to about 10; (3) from about 40 to about 75 parts of a non-filled polyether component having a functionality of from about 1.5 to about 4 and a molecular weight of from about 2000 to about 12,000; (4) from about 0.1 to about 3.0 parts of a cell-opening surfactant of the formula M*Dx Dâ€³y M* â€ƒin which M* represents (CH3)3 SiO1/2 or R(CH3)2 SiO1/2, D represents (CH3)2 SiO2/2, and Dâ€³ represents (CH3)(R)SiO2/2, wherein x is 81-220, y is 8-40 and D/Dâ€³+Mâ€³)&lE;10, in which Mâ€³ represents R(CH3)2 SiO1/2; R represents a polyether-containing substituent derived from a blend of certain polyethers selected from two different groups in which the average molecular mass is 1100-1800; (5) from about 1 to about 3 parts water, based on 100 parts of the polyol component, wherein the amounts of components (1), (2), (3) and (4) total 100 parts; and (6) a tertiary amine catalyst in an amount about 0.2 to about 3.0 parts.