C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/12 (2006.01) C08G 18/42 (2006.01) C08G 18/48 (2006.01) C08G 18/65 (2006.01) C08G 18/66 (2006.01) C08G 18/76 (2006.01) H04B 7/26 (2006.01)
Patent
CA 2111099
2111099 9222595 PCTABS00018 This invention relates to a process of preparing polyurethane polymers by reaction of an isocyanate composition having an isocyanate equivalent weight of from 180 to 300 and comprising in from at least 50 weight percent a prepolymer, with an active hydrogen-containing substance in the presence of water which provides for at least 50 mole percent of the total blowing requirement. The prepolymer is obtained by reacting a molar excess of a polyisocyanate comprising, in from at least 70 weight percent, 4,4'-methylene diphenylisocyanate with an isocyanate-reactive composition containing (a) a branched diol or triol having a molecular weight of from 60 to 300, and (b) a polyoxyalkylene polyol or mixtures thereof having an average functionality of from 2 to 4 and a molecular weight of from 3000 to 12000, wherein the parts by weight ratio of (a):(b) is from 0.01:1 to 0.25:1.
Broos Rene
Maccari Bruno
Paap Frans
Dow Italia S.p.a.
Smart & Biggar
The Dow Chemical Company
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