C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
403/41
C08G 18/48 (2006.01) C08G 18/10 (2006.01) C08G 18/40 (2006.01) C08G 18/76 (2006.01) C08G 18/79 (2006.01)
Patent
CA 2026550
ABSTRACT A soft, moldable, flexible polyurethane foam prepared by reacting a prepolymer comprising the reaction product of from 25 to 75 percent by weight of a first polyol, this polyol being a polyether polyol having an equivalent weight of greater than 1000 and a nominal functionality of 1.6 to 3, and from 25 to 75 percent of diphenylmethanediisocyanate or a derivative thereof, such that there is a stoichiometric excess of the diphenylmethanediisocyanate or derivative thereof; and a second polyol. The method of preparing this foam is also described. The foam preferably exhibits a Shore A hardness of less than about 30 and a compression set at room temperature of less than about 10 percent at 50 percent compression, allowing for application in, for example, gaskets (both molded and foam-in-place type), joint compounds, shock-absorbing insert articles, carpet underlay materials and some flotation devices. 38,255-F
Smart & Biggar
The Dow Chemical Company
Weaver Laura B.
LandOfFree
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