Use of N-(aminoalkyl) pyrrolidines as catalysts for the polyisocyanate polyaddition process
AssigneeBayer Aktiengesellschaft
InventorsRichard Weider, Uwe Scholz
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Abstract
The present invention relates to a process for preparing polyisocyanate polyaddition products by reacting (a) polyisocyanates with (b) relatively high molecular weight compounds containing at least two isocyanate-reactive hydrogen atoms and (c) chain-extending agents, in the presence of (d) N-(aminoalkyl)pyrrolidine catalysts corresponding to formula (I) in which R is a C2-12 alkylene group (optionally containing O or N atoms but not isocyanate-reactive groups) and R′ is hydrogen or a C1-4 alkyl group, (e) optionally, other known catalysts, and (f) other known additives.
Claims4
A process for preparing a polyisocyanate polyaddition product comprising reacting
- (a) a polyisocyanate with
- (b) a relatively high molecular weight compound containing at least two isocyanate-reactive hydrogen atoms and
- (c) a chain-extending agent, in the presence of
- (d) an N-(aminoalkyl)pyrrolidine catalyst corresponding to the formula
- in which
- R is a C2-12 alkylene group (optionally containing O or N atoms but not isocyanate-reactive groups) and
- R′ is hydrogen or a C1-4 alkyl group,
- (e) optionally, other known catalysts, and
- (f) other known additives.
Dependencies are inferred from the claim text.