Bismuth catalyst system for preparing polyurethane elastomers
AssigneeCosan Chemical Corporation
InventorsArthur R. Leckart, H. Victor Hansen
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Abstract
Processes are provided for preparing polyurethane elastomers by reacting a polyether or polyester polyol with a polyisocyanate in the presence of a catalytic amount of a bismuth salt of a carboxylic acid having from 2 to 20 carbon atoms. The catalysts of these processes are relatively non-toxic, yet they promote rapid polymerization for a wide variety of polyurethane elastomeric applications.
Claims9
A process for preparing a polyurethane elastomer by reacting a polyol selected from polyether polyols and polyester polyols with an organic polyisocyanate wherein the ratio of NCO groups to hydroxyl groups is from 0.70 to 1 to 1.35 to 1 in the presence of a catalytic amount of a bismuth salt of a carboxylic acid having from 2 to 20 carbon atoms in the molecule, which salt is the sole catalyst in the reaction mixture.
A process for preparing a polyurethane elastomer by reacting a polyol selected from polyether polyols and polyester polyols with an organic polyisocyanate, in the presence of an effective amount of a chain extender, wherein the ratio of NCO groups to hydroxyl groups is from 0.70 to 1 to 1.35 to 1, in the presence of a catalytic amount of a bismuth salt of a carboxylic acid having from 2 to 20 carbon atoms in the molecule, which salt is the sole catalyst in the reaction mixture.
Dependencies are inferred from the claim text.