Flexible,open-cell,non-discoloring polyurethane foam

Abstract

Abstract FLEXIBLE, OPEN-CELL, POLYURETHANE FOAMS ARE PREPARED BY REACTING AN ALIPHATIC, OR AN ALIPHATIC-LIKE, ORGANIC POLYISOCYANATE, SUCH AS DIMETHYL BENZENE W,W''-DIISOCYANATE (XYLYLENE DIISOCYANATE) WITH AN ACTIVE-HYDROGEN-CONTAINING POLYOL IN THE PRESENCE OF A MIXED CATALYST SYSTEM COMPRISING AN ALKANOLAMINE, A STANNOUS SALT OF A CARBOXYLIC ACID, AND A STANNIC SALT OF A CARBOXYLIC ACID. DISCOLORATION OF THE RESULTING FOAMS CAN BE PREVENTED BY INCLUDING IN THE REACTION MIXTURE A MIXED STABILIZER SYSTEM COMPRISING A PRIMARY ANTIOXIDANT SUCH AS A HIGH MOLECULAR WEIGHT HINDERED POLYPHENOL, A SECOND HIGH ANTIOXIDANT, SUCH AS A HIGH MOLECULAR WEIGHT PHOSPHITE AND AN ULTRAVIOLET LIGHT ABSORBING COMPOUND.

Inventors

• 👤 R Lamplugh
• 👤 F Meisel

Bibliographic Details