Cured reaction product of unsaturated acetal, polyhydroxyalcohol and cellulose and process for preparing same

Claim 1

PROCESS FOR THE PRODUCTION OF A RESIN WHICH COMPRISES COMBINING AN A,B-ETHYLENICALLY UNSATURATED DIACETAL OF AN A,B-ETHYLENICALLY UNSATURATED ALDEHYDE AND A POLYHYDROXY COMPOUND SELECTED FROM THE GROUP CONSISTING OF PENTAERYTHRITOL AND ANHYDROENNEAHEPTITOL WITH AN AMOUNT, INSUFFICIENT TO CURE THE ACETAL COMPLETELY, OF A POLYHYDROXY ALCOHOL CONTAINING AT LEAST TWO, BUT NOT MORE THAN SIX HYDROXY GROUPS, AT LEAST TWO HYDROXY GROUPS BEING SEPARATED FROM EACH OTHER BY A CARBON BRIDGE OF AT LEAST THREE CARBON ATOMS, PRECURING THE THUS OBTAINED MIXTURE BY MAINTAINING IT IN THE PRESENCE OF AN ACIDIC CATALYST AT A TEMPERATURE ABOVE ITS FUSION POINT AND BELOW ABOUT 100*C. FOR A PERIOD BETWEEN 0.5 AND 1.0 HOUR, THEREAFTER COMBINING THE PRECURED MIXTURE WITH CELLULOSE, AND CURING THE THUS OBTAINED ADMIXTURE BY MAINTAINING IT IN THE PRESENCE OF AN ACIDIC CATALYST AT A TEMPERATURE BETWEEN ABOUT 80*C. AND 120*C. FOR A PERIOD BETWEEN ABOUT 12 AND 24 HOURS.