C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/48 (2006.01) C08G 18/76 (2006.01)
Patent
CA 2308701
Sound-damping and energy-absorbing flexible PUR foams are produced by reacting organic and/or modified organic polyisocyanates (a) with a polyetherol mixture (b) and, if desired, further compounds (c) bearing hydrogen atoms which are reactive toward isocyanates, in the presence of water and/or other blowing agents (d), catalysts (e) and, if desired, further auxiliaries and additives (f), wherein the polyetherol mixture (b) comprises b1) at least one bifunctional to eight-functional polyetherol based on propylene oxide and/or butylene oxide and ethylene oxide, where the proportion of ethylene oxide, based on the total amount of alkylene oxide used, is more than 40% by weight, and having an OH number of from 20 to 1000 mg KOH/g and a proportion of primary OH groups of greater than 50%, with the proviso that b1) comprises at least one at least bifunctional polyetherol b1.1) having an OH number of from 20 to 100 mg KOH/g, b2) at least one bifunctional to six-functional polyetherol based on propylene oxide and/or butylene oxide and having an OH number of greater than 30 mg KOH/g and b3) at least one further polyetherol based on ethylene oxide and propylene oxide and having a proportion of primary OH groups of more than 25%, where the component b1) is used in a proportion of more than 30% by weight, based on the total weight of the polyetherol mixture (b). The sound-damping and energy-absorbing PUR foams produced by this process can be used as energy absorbers, damping material and for filling hollow spaces.
Falke Peter
Rotermund Inge
Schmaler Kirsten
Schmutzer Klaus
Basf Aktiengesellschaft
Robic
LandOfFree
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