	US 12,258,435 B1
	Method for preparing low density polyurethanes using catalysts that are free from tertiary amines and tin
Stephen Edward Cavender, Charlotte, NC (US); Rajeshkumar K. Patel, Sharjah (AE); and Nishith K. Patel, West Orange, NJ (US)
Assigned to PATCHAM USA LLC, Fairfield, NJ (US)
Filed by PATCHAM USA LLC, Fairfield, NJ (US)
Filed on Nov. 4, 2024, as Appl. No. 18/936,147.
Application 18/936,147 is a continuation in part of application No. 18/434,486, filed on Feb. 6, 2024.
Int. Cl. C08G 18/22 (2006.01); C08G 18/08 (2006.01); C08G 18/48 (2006.01); C08G 18/76 (2006.01)

CPC C08G 18/227 (2013.01) [C08G 18/14 (2013.01); C08G 18/225 (2013.01); C08G 18/4829 (2013.01); C08G 18/7614 (2013.01); C08G 2110/0008 (2021.01); C08G 2110/0083 (2021.01)]

5 Claims

1. 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.