Back to results
US 12,258,435 B1Granted
Method for preparing low density polyurethanes using catalysts that are free from tertiary amines and tin
AssigneePatcham USA LLC
InventorsStephen Edward Cavender, Rajeshkumar K. Patel, Nishith K. Patel
Life of this patent
Estimating the term…
Abstract
Disclosed is a method for preparing a soft, water blown, polyurethane foam product, or microcellular elastomer using a stable, liquid, tertiary amine and tin-free polyurethane catalyst. The catalyst contains a combination of bismuth and sodium carboxylates.
Claims5
A method for preparing a water blown, soft polyurethane foam product or a microcellular polyurethane elastomer product, comprising:
- (a) providing a premix containing a polyol, water and a blow/gel catalyst combination, wherein the catalyst combination comprises a bismuth carboxylate of a monocarboxylic acid(s) of 2-17 carbon atoms, and a sodium carboxylate of a monocarboxylic acid(s) of 2-17 carbon atoms, wherein the premix is free of tertiary amine and tin catalysts, and
- (b) contacting the premix with poly functional isocyanate at an isocyanate index of less than 120.
Dependencies are inferred from the claim text.