Branched chain polyurethane polymers

Claim 1

A CURABLE POLYURETHANE POLYMER HAVING AT LEAST ONE URETHANE LINKAGE, -NHCOO-, FOR EACH 250 TO 1500 MOLECULAR WEIGHT UNITS AND AT LEAST ONE BRANCHING POINT FOR EACH 5000 TO 50,000 MOLECULAR WEIGHT UNITS, SAID POLYMER BEING PREPARED BY REACTING AN ESSENTIALLY STOICHIOMETRICALLY EQUIVALENT AMOUNT OF AN ORGANIC DIISOCYANATE WITH A MIXTURE OF A MONOHYDROXYL COMPOUND, A GLYCOL AND A TRIHYDROXYL COMPOUND WITH THE RATIO OF HYDROXYL COMPOUNDS IN SAID MIXTURE BEING SUCH SO AS TO PROVIDE A MOLAR RATIO OF GLYCOL TO MONOHYDROXYL COMPOUND OF BETWEEN ABOUT 1:1 AND 12:1 AND A MOLAR RATIO OF TRIHYDROXYL COMPOUND TO MONOHYDROXYL COMPOUND OF BETWEEN ABOUT 0.3:1 AND 0.7:1, WITH THE PROVISO THAT SAID MONOHYDROXYL COMPOUND CONTAIN AT LEAST ONE CARBON-TOCARBON CONJUGATED DOUBLE BOND SYSTEM WHICH SERVES AS A CROSS LINKING SITE, SAID MONOHYDROXYL COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF 2,4-HEXADIENE-1-OL AND B(9-ANTHRACYL)ETHANOL, SAID GLYCOL HAVING A MOLECULAR WEIGHT OF FROM ABOUT 750 TO 3000 AND BEING SELECTED FROM THE GROUP CONSISTING OF POLYALKYLENEETHER GLYCOLS, POLYALKYLENEETHER-THIOETHER GLYCOLS AND POLYALKYLENEARYLENEETHER GLYCOLS, SAID TRIHYDROXYL COMPOUND BEING AN ORGANIC COMPOUND WHEREIN THE 3 HYDROXYL GROUPS ARE ATTACHED TO CARBON ATOMS WHICH CONTAIN AT LEAST ONE HYDROGEN ATOM AND BEING SELECTED FROM THE GROUP CONSISTING OF 1,1,1-TRIMETHYLOLETHANE, TRIMETHYLOLPROPANE, GLYCEROL, TRIMETHYLOLBENZENE, AND 1,2,6-TRIHYDROXYHEXANE.