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US 4,786,655 AGranted
Process for the preparation of polyurethanes containing uretdione rings formed in the presence of a bismuth salt of an organic carboxylic acid
AssigneeBayer Aktiengesellschaft
InventorsGerhard Grogler, Heinrich Hess, Richard Kopp
Life of this patent
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Abstract
Polyurethanes containing uretdione rings are produced by reacting a polyisocyanate containing a uretdione ring with a relatively high molecular weight dihydroxyl compound in the presence of a bismuth salt of an organic carboxylic acid and a low molecular weight aromatic diamine. The low molecular weight aromatic diamine is used in a quantity which is 5 to 10 times the quantity of bismuth salt used. These solid polyurethanes are formed in relatively short reaction times and possess outstanding mechanical properties.
Claims6
A process for the production of a polyurethane in which
- (a) an organic polyisocyanate which is at least 50 wt. % diisocyanate containing a uretdione ring
- is reacted with
- (b) a relatively high molecular weight organic dihydroxyl compound
- in the presence of
- (c) a bismuth salt of an organic carboxylic acid and
- (d) a low molecular weight aromatic diamine in a quantity which is from 5 to 10 times the quantity of bismuth salt (c) used.
3 more elements
Dependencies are inferred from the claim text.