Patent ID: 6740686
Filing Date: 2004-05-25
Classification: C08G

Abstract:
Process for the manufacture of a polyurethane foam by reaction of at least one polyesterpolyol and of at least one polyisocyanate in the presence of a foaming agent and of a catalyzing agent, such a polyesterpolyol having been obtained beforehand by reaction of an acid reactant A, comprising at least one aliphatic or aromatic polyacid with a fuctionality at least equal to 2, with at least one polyol P2 with a functionality equal to 2 and at least one polyol P3 with a functionality at leas equal to 3 and subsequently being denoted by AP2P3, characterized in that the catalyzing agent is at least partially composed of at least one amine polyesterpolyol AP2P3, in which at least a portion of the polyol P3 is composed of at least one polyoxyalkylenated polyalkanolamine having at least one tertiary amine fuctional group, the alkanol radicals of the said polyalkanolamine being C1-C6 radicals, the alkylene oxide units being C2-C4 units and the statistical mean of the number N of alkylene oxide units per polyoxyalkylated polyalkanolamine molecule being equal to fÃ—x, f being the number of hydroxyl functional groups per polyalkanolamine molecule and x being a number between 1 and 10 inclusive.