Patent ID: 6337356
Filing Date: 2002-01-08
Classification: C08G,Y10S

Abstract:
A process for producing sound-absorbing polyurethane foams having an adhesive surface comprising reacting organic and/or modified organic polyisocyanates (a) with a polyetherol mixture (b) in the presence of water and/or other blowing agents (d), catalysts (e) and, optionally, further auxiliaries and additives (f), wherein the polyetherol mixture (b) comprisesb1) at least one bifunctional to eight-functional polyetherol based on ethylene oxide and propylene oxide and having an OH number of from 20 to 80 mg KOH/g and a proportion of primary OH groups of >50%, where the proportion of ethylene oxide in the polyetherol is greater than 10% by weight, and at most 30% by weight, b2) at least one polyetherol based on ethylene oxide and a second alkylene oxide selected from the group consisting of propylene oxide, butylene oxide and mixtures thereof, and a bifunctional to eight-functional initiator and having an OH number of from 20 to 80 mg KOH/g, where the proportion of ethylene oxide in the polyetherol is >30% by weight, in amounts of from 10 to 50 parts by weight, and wherein the proportion of primary OH groups is >50%, and b3) at least one polyetherol based on propylene oxide and/or butylene oxide and optionally, ethylene oxide and a bifunctional to eight-functional initiator and having an OH number of from 30 to 400 mg KOH/g, where the proportion of ethylene oxide in the polyetherol is <30% by weight, and where the proportion of secondary OH groups is greater than 90%.