Improved polyether-urethane foams and preparation of same

Claim 1

THE METHOD WHICH COMPRISES FORMING A BLOCK POLYETHERURETHANE BY (1) REACTING AN ORGANIC DIISOCYANATE WITH AN AMOUNT OF A MEMBER OF THE GROUP CONSISTING OF (A) A POLYETHER GLYCOL AND (B) A POLYETHERURETHANE FORMED BY REACTING 1 MOLE OF AN ORGANIC DIISOCYNATE WITH ABOUT 2 MOLES OF A POLYETHER GLYCOL, SUFFICIENT TO PROVIDE A POLYETHERURETHANE HAVING TERMINAL ISOCYANATO GROUPS, (2) REACTING SAID LAST:NAMED POLYETHERURETHANE WITH ADDITIONAL POLYETHER GLYCOL IN AN AMOUNT SUFFICIENT TO INCREASE THE MOLECULAR WEIGHT OF AND TO PROVIDE SAID POLYETHERURETHANE WITH TERMINAL HYDROXY GROUPS, AND (3) REACTING THE PRODUCT OF (2) WITH ADDITIONAL ORGANIC DIISOCYMATE IN AN AMOUNT AT LEAST SUFFICIENT TO INCREASE THE MOLECULAR WEIGHT OF AND TO PROVIDE THE PRODUCT OF (2) WITH TERMINAL ISOCYNATO GROUPS AND WITH EXCESS ORGANIX DIISOCYNATE AND TO FORM A BLOCK POLYETHERURETHANE, SAID POLYESTER GLYCOL HAVING A MOLECULAR WEIGHT OF FROM ABOUT 750 TO 10,000, THE TOTAL MOLE RATIO OF SAID POLYETHER GLYCOL TO SAID ORGANIC DIISOCYANATE BEING FROM ABOUT 1:1.1 TO 1:12, MIXING SAID BLOCK POLYETHERURETHANE WITH WATER, A CATALYST FOR THE URETHANE FOAMING REACTION, AND A SILICONE OIL IN AN AMOUNT SUFFICIENT TO CAUSE FOAMING OF SAID BLOCK POLYETHERURETHANE, AND FOAMING SAID BLOCK POLYETHERURETHANE, SAID SILICONE OIL BEING SELECTED FROM THE GROUP CONSISTING OF POLYDIALKY- DIARYL- AND DIALKYL-ARYL-SILOXANES HAVING A VISCOSITY OF FROM ABOUT 10 TO 100 CENTISTROKES AT 25*C.