Cross-linked plastics of high molecular weight and process for producing same

Claim 1

IN THE PREPARATION OF AN ELASTOMERIC SUBSTANTIALLY NON-POROUS POLYURETHANE BY A PROCESS WHICH COMPRISES REACTING AN ORGANIC DIISOCYANATE WITH A POLYESTER AND A GLYCOL TO FORM A STORABLE PRODUCT AND THEN REACTING THIS PRODUCT WITH ADDITIONAL ORGANIC DIISOCYANATE, THE METHOD OF MAKING A STORABLE PRODUCT OF IMPROVED STABILITY WHICH COMPRISES MIXING (1) A SUBSTANTIALLY LINEAR POLYESTER SELECTED FROM THE GROUP CONSISTING OF A POLYESTER PREPARED BY ESTERFICATION OF A DICARBOXYLIC ACID AND AN ALIPHATIC GLYCOL, AND A POLYESTER PREPARED BY ESTERFICATION OF A DICARBOXYLIC ACID AND A MIXTURE OF A MAJOR AMOUNT OF AN ALIPHATIC GLYCOL AND A MINOR AMOUNT OF A COMPOUND SELECTED FROM THE CLASS CONSISTING OF A DIAMINE AND AN AMINO ALCOHOL, SAID POLYESTER HAVING AN ACID NUMBER OF ABOUT 1 AND AN OH NUMBER OF FROM ABOUT 20 TO ABOUT 80 AND (2) FROM ABOUT 1 PERCENT TO ABOUT 30 PERCENT BY WEIGHT BASED ON THE WEIGHT OF THE POLYESTER OF A GLYCOL HAVING ITS HYDROXYL GROUPS ATTACHED TO AN ORGANIC RADICAL OF LESS THAN 16 CARBON ATOMS, SAID GLYCOL BEING FREE FROM AROMATIC RADICALS AND SELECTED FROM THE CLASS CONSISTING OF ALIPHATIC GLYCOLS AND CYCLOALIPHATIC GLYCOLS, AND THEREAFTER MIXING THE RESULTING MIXTURE UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS WITH (3) AN ORGANIC DIISOCYANATE IN AN AMOUNT INSUFFICIENT TO REACT WITH ALL OF THE FUNCTIONAL GROUPS OF THE POLYESTER AND GLYCOL, EFFECTING CHEMICAL REACTION UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS TO FORM A MILLABLE ADDUCT HAVING TERMINAL OH GROUPS AND AN HYDROXYL NUMBER OF AT LEAST 5, AND THEREAFTER MIXING THE ADDUCT WITH AN EXCESS OF AN AROMATIC DIMERIC DIISOCYANATE HAVING THE FORMULA: