High acetyl cellulose acetate molding compositions and the manufacture of molded pieces therefrom

Claim 1

A COMPOSITION ADAPTED TO BE MOLDED IN THE ABSENCE OF VOLATILE SOLVENT AT HIGH PRESSURE AND TEMPERATURE WITHOUT ANY APPRECIABLE DISCOLORATION OR DEGRADATION, ESSENTIALLY CONSISTING OF 100 PARTS OF AN ACETYL CELLULOSE HAVING A DEGREE OF ESTERIFICATION OF AT LEAST 2.76 ACYL GROUPS PER C6 CELLULOSE UNIT, AT LEAST 95% OF THE ACYL CONTENT BEING ACETYL, A COMBINED SULFUR CONTENT OF NOT MORE THAN .005%, AN ACTIVE ASH CONTENT OF NOT MORE THAN .05% AND SUBSTANTIAL FREEDOM FROM ACIDITY, 20-90 PARTS OF A HEAT STABLE PLASTICIZER SELECTED FROM THE GROUPCONSISTING OF TRIPHENYL PHOSPHATE, DIMETHYL PHTHALATE AND OCTYL PHENOL, AT LEAST 5 PARTS OF WHICH PLASTICIZER IS UNIFORMLY DISTRIBUTED THROUGHOUT THE ACETYL CELLULOSE AND SUFFICIENT OF A SUBSTITUTED PHENOL SELECTED FROM THE GROUP CONSISTING OF P-TERTIARY BUTYL PHENOL, THYMOL, 2-METHOXY-4-METHYL PHENOL AND EUGENOL TO INHIBIT THE EFFECT OF OXYGEN ON THE COMPOSITION UNDER MOLDING CONDITIONS, FROM WHICH COMPOSITION MOLDED PRODUCTS CAN BE OBTAINED HAVING GOOD PERMANENCE, COLOR AND HARDNESS AND A FLEXURAL STRENGTH OF AT LEAST 2500 P.S.I.