Method of preparing polyurethane starch reaction products and product thereof

Claim 1

THE METHOD WHICH COMPRISES PROVIDING A SUBSTANCOMPLETELY REACTED, LIQUID DIISOCYANATE-MODIFIED POLYESTER CONTAINING TERMINAL ISOCYANATE GROUPS, SAID DIISOCYANATE-MODIFED POLYESTER HAVING BEEN MADE BY REACTING A LINEAR POLYESTER MADE FROM AN EXCESS OF A GLYCOL OF THE FORMULA HO-R-OH, WHEREIN R IS AN ALIPHATIC DIVALENT HYDROCARBON GROUP CONTAINING FROM 2 TO 6 CARBON ATOMS AND AN ALIPHATIC SATURATED DICARBOXYLIC ACID OF THE FORMULA COOH-(CH2)N-COOH WHEREIN N IS AN INTEGER WITHIN THE RANGE FROM 2 TO 10, THE SAID POLYESTER CONTAINING TERMINAL ALCOHOLIC HYDROXYL GROUPS AND HAVING A HYDROXLY NUMBER OF FROM 20TO 120 AND AN ACID VALUE OF A LESS THAN 2, UNDER ANHYDROUS CONDITION AT A TEMPERATURE OF FROM 70 TO 150* C. WITH AN ORGANIC DIISOCYANATE IN FROM 20% TO 250% EXCESS OF THE AMOUNT THEORTICALLY REQUIRED TO REACT WITH ALL OF THE HYDROXYL GROUPS IN THE POLYESTER INTIMATELY MIXING SAID SUBSTANTIALLY COMPLETELY REACTED, LIQUID DIISOCYANATE-MODIFIED POLYESTER WITH STARCH IN AMOUNT OF FROM 58 TO 150 PARTS OF STARCH PER 100 PARTS OF SAID MODIFIED POLYESTER AT A TEMPERATURE BETWEEN ROOM TEMPERATURE AND 180* C., AND CURING THE RESULTING MIXTURE UNDREE HEAT AND PRESSURE.

Claim 2

THE METHOD WHICH COMPRISES PROVIDING A SUBSTANCOMPLETELY REACTED, LIQUID DIISOCYANATE-MODIFIED POLYESTER CONTAINING TERMINAL ISOCYANATE GROUPS, SAID DIISOCYANATE-MODIFED POLYESTER HAVING BEEN MADE BY REACTING A LINEAR POLYESTER MADE FROM AN EXCESS OF A GLYCOL OF THE FORMULA HO-R-OH, WHEREIN R IS AN ALIPHATIC DIVALENT HYDROCARBON GROUP CONTAINING FROM 2 TO 6 CARBON ATOMS AND AN ALIPHATIC SATURATED DICARBOXYLIC ACID OF THE FORMULA COOH-(CH2)N-COOH WHEREIN N IS AN INTEGER WITHIN THE RANGE FROM 2 TO 10, THE SAID POLYESTER CONTAINING TERMINAL ALCOHOLIC HYDROXYL GROUPS AND HAVING A HYDROXLY NUMBER OF FROM 20TO 120 AND AN ACID VALUE OF A LESS THAN 2, UNDER ANHYDROUS CONDITION AT A TEMPERATURE OF FROM 70 TO 150* C. WITH AN ORGANIC DIISOCYANATE IN FROM 20% TO 250% EXCESS OF THE AMOUNT THEORTICALLY REQUIRED TO REACT WITH ALL OF THE HYDROXYL GROUPS IN THE POLYESTER INTIMATELY MIXING SAID SUBSTANTIALLY COMPLETELY REACTED, LIQUID DIISOCYANATE-MODIFIED POLYESTER WITH STARCH IN AMOUNT OF FROM 58 TO 150 PARTS OF STARCH PER 100 PARTS OF SAID MODIFIED POLYESTER AT A TEMPERATURE BETWEEN ROOM TEMPERATURE AND 180* C., AND CURING THE RESULTING MIXTURE UNDREE HEAT AND PRESSURE.