Molding composition suitable for phonograph records comprising tough polyvinyl acetal resin and petroleum-hydrocarbon insoluble resinous wood extract

Claim 1

A HEAT AND PRESSURE-MOLDABLE COMPOSITION SUITABLE FOR THE MANUFACTURE OF HEAT AND PRESSURE-MOLDED PHONOGRAPH RECORDS, AND COMPRISING A UNIFORM MIXTURE OF (1) A TOUGH AND HORNY POLYVINYL ACETAL RESIN OBTAINED FROM A POLYVINYL ACETATE OF A VISCOSITY OF AT LEAST 7 CENTIPOISES MEASURED AT 20* C. IN A BENZENE SOLUTION CONTAINING 86 GRAMS OF THE POLYVINYL ACETATE PER LITER) AND HYDROLYZED TO THE EXTENT OF AT LEAST 80%, FOLLOWED BY REACTION WITH AN ALDEHYDE, (2) ABOUT 25% TO 125% BY WEIGHT, BASED ON THE WEIGHT OF SAID RESIN, OF A PETROLEUM HYDROCARBONINSOLUBLE, AROMATIC HYDROCARBON-SOLUBLE, RESINOUS PINE WOOD EXTRACT, (3) ABOUT 2 1/2 TO 15%, BASED ON THE WEIGHT OF THE ACETAL RESIN, OF A METAL SOAP, AND (4) A SMALL PROPORTION OF WAX, SAID ACETAL RESIN HAVING A HIGHER SOFTENING POINT THAN SAID PINE WOOD EXTRACT AND SUCH SOFTENING POINT BEING REDUCED BY THE PINE WOOD EXTRACT.