Process for preparing rigid polyurethane foams
First Claim
1. A process for preparing rigid foams which possess urethane groups, comprising reactinga) polyisocyanates withb) compounds which possess at least two active hydrogen atoms which are reactive towards isocyanate groups, with molecular weights of 92 to 10,000 in the presence ofc) water and alkanes as blowing agent andd) solution promoters wherein said solution promoter, which is used, is at least one compound with a polar group, selected from the group consisting of diethyl carbonate, a reaction product of a total of two moles of tall oil fatty acid and a total of one mole of 3-dimethylaminopropyl-amine-1, and methyltrioctylammonium chloride.
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Abstract
Rigid foams which possess urethane groups are prepared by reacting polyisocyanates with compounds which possess at least two active hydrogen atoms which are reactive towards isocyanate groups, in the presence of water and alkanes as blowing agent and solution promoters. The solution promoter used is a compound with a polar group.
18 Citations
5 Claims
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1. A process for preparing rigid foams which possess urethane groups, comprising reacting
a) polyisocyanates with b) compounds which possess at least two active hydrogen atoms which are reactive towards isocyanate groups, with molecular weights of 92 to 10,000 in the presence of c) water and alkanes as blowing agent and d) solution promoters wherein said solution promoter, which is used, is at least one compound with a polar group, selected from the group consisting of diethyl carbonate, a reaction product of a total of two moles of tall oil fatty acid and a total of one mole of 3-dimethylaminopropyl-amine-1, and methyltrioctylammonium chloride.
Specification