CONTINOUS PROCESS FOR PRODUCING VARIABLE HARDNESS POLYURETHANE MOLDED PARTS

摘要

A CONTlNUOUS PROCESS FOR PRODUCING VARIABLE HARDNESS POLYURETHANE MOLDED PARTS The instant invention generally relates to the continuous production of variable hardness molded polyurethane foam parts. Hardness of a foam is a function of the density of the foam and the index of the foamable reaction mixture. These variable hardness parts are continuously produced by the controlled addition of an inert blowing agent which directly affects density. These parts may also be produced by utilizing the double effect of controlling both the addition of the blowing agent and the foam index.