Polyurethane foam-producing compositions comprising microencapsulated particles and a method of making foams therefrom

Claim 1

A STABLE, POTENTIALLY REACTIVE, SELF-CONTAINED, SUBSTANTIALLY HOMOGENEOUS POLYURETHANE FOAM-PRODUCING COMPOSITION COMPRISING AN ORGANIC POLYISOCYANATE, AN ORGANIC POLYOL, AND A SODIUM BOROHYDRIDE FOAMING AGENT, EACH OF A PLURALITY OF DISCRETE MINUTE PARTICLES OF ALL OF AT LEAST SAID ORGANIC POLYOL FORMING THE NUCLEUS OF A MINUTE CAPSULE HAVING AN INERT, IMPERMEABLE, POLYMERIC, FILM-FORMING WALL MATERIAL WHICH PREVENTS CONTACT BETWEEN THE NUCLEUS MATERIAL AND ANY REMAINING NONENCAPSULATED INGREDIENTS IN THE COMPOSITION, SAID INGREDIENTS BEING NON-REACTIVE IN THE ABSENCE OF CONTACT WITH SAID NUCLEUS MATERIAL, SAID WALL MATERIAL BEING INSOLUBLE IN SAID NUCLEUS MATERIAL AND SAID REMAINING INGREDIENTS AT THE TEMPERATURE AT WHICH THE COMPOSITION IS PRODUCED, AND SAID ORGANIC POLYOL BEING A SOLID AT THE TEMPERATURE AT WHICH THE COMPOSITION IS PRODUCED, MELTING AT A TEMPERATURE LOWER THAN THE MELTING TEMPERATURE OF THE WALL MATERIAL WITH WHICH IT IS ENCAPSULATED, AND IN ITS MELTED STATE, IMBIBING SAID WALL MATERIAL SUFFICIENTLY TO EFFECT ITS RELEASE THROUGH THE WALL MATERIAL.