Laminated polyurethane foam cushion

Claim 1

A FLEXIBLE FOAM CUSHION COMPRISING (1) A RELATIVELY THIN UPPER FOAM LAYER OF A RELATIVELY LOW DENSITY CELLULAR POLYURETHANE ELASTOMER, SAID ELASTOMER BEING THE REACTION PRODUCT OF AN ORGANIC DIISOCYANATE AND AN ACYCLIC HYDROYL-TERMINATED POLYALKYLENE ETHER HAVING A MOLECULAR WEIGHT OF ABOUT 1500 TO 5000, AND (2) A RELATIVELY THICK FOAM BASED LAYER OF A RELATIVELY LOW DENSITY CELLULAR POLYURETHANE ELASTOMER, SAID BASE LAYER HAVING A LOWER DEFLECTION PER UNIT OF LOAD AT HIGH DEFLECTION THAN SAID UPPER LAYER, SAID LAST-NAMED ELASTOMER BEING THE REACTION PRODUCT OF (A) AN ORGANIC DIISOCYANATE, (B) AN ACYCLIC HYDROXYL-TERMINATED POLYALKYLENE ETHER HAVING A MOLECULAR WEIGHT OF 1500 TO 5000 IN AN EQUIVALENT WEIGHT RATIO OF DIISOCYANATE TO GLYCOL OF ABOUT 2:1 TO 6:1, (C) AN ACTIVATOR MIXTURE COMPRISING WATER AND A REACTION CATALYST WHICH INFLUENCES THE POLYURETHANE FOAMING REACTION, AND (D) ABOUT 10 TO 25 PARTS BY WEIGHT BASED ON 100 PARTS BY WEIGHT OF THE POLYALKYLENE ETHER PLUS DIISOCYANATE OF ELONGATER WOOD CELLULOSE PARATICLES HAVING A PARTICLE SIZE OF ABOUT 1 TO 100 MICRONS.