Molding compositions of high molecular weight and low molecular weight polymers

Claim 1

A RESINOUS COMPOSITION CONSISTING OF FROM 60 TO 98 PERCENT BY WEIGHT OF A NORMALLY SOLID THERMOPLASTIC ALKENYL AROMATIC RESIN A SELECTED FROM THE GROUP CONSISTING OF (1) A POLYMERIZED MONOVINYL AROMATIC HYDROCARBON OF THE BENZENE SERIES, (2) COPOLYMERS OF AT LEAST 60 PERCENT BY WEIGHT OF A MONOVINYL AROMATIC HYDROCARBON OF THE BENZENE SERIES AND NOT MORE THAN 40 PERCENT OF AN ALKENYL AROMATIC HYDROCARBON OF THE BENZENE SERIES HAVING A SINGLE ISOPROPENYL RADICAL DIRECTLY ATTACHED TO A CARBON ATOM OF THE AROMATIC NUCLEUS AND (3) RESINOUS PRODUCTS CONSISTING OF FROM 60 TO 98 PERCENT BY WEIGHT OF AT LEAST ONE OF THE POLYMERS OF 1 AND 2 AND FROM 40 TO 2 PERCENT OF A RUBBERY ELASTOMER WHICH IS A MEMBER OF THE GROUP CONSISTING OF NATURAL RUBBER AND RUBBERY COPOLYMERS OF FROM 40 TO 80 PERCENT BY WEIGHT OF BUTADIENE AND FROM 60 TO 20 PERCENT OF STYRENE, THE SAID RESIN A CONTAINING NOT MORE THAN 3 PERCENT BY WEIGHT OF VOLATILE INGREDIENTS CAPABLE OF BEING VAPORIZED AND REMOVED BY HEATING THE RESIN AT A TEMPERATURE OF 213*C. AT ONE MILLIMETER ABSOLUTE PRESSURE FOR A TIME OF 25 MINUTES AND HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 140,000, AS DETERMINED BY THE SCATTERING OF LIGHT, INTIMATELY INCORPORATED WITH 40 TO 2 PERCENT OF A NORMALLY SOLID THERMOPLASTIC ALKENYL AROMATIC RESIN B SELECTED FROM THE GROUP CONSISTING OF A POLYMERIZED MONOALKENYL AROMATIC HYDROCARBON OF THE BENZENE SERIES HAVING A SINGLE ETHYLENICALLY UNSATURATED GROUP OF THE FORMULA CH2=CR- WHEREIN R REPRESENTS A MEMBER OF THE GROUP CONSISTING OF HYDROGEN, METHYL AND ETHYL RADICALS, SAID GROUP BEING DIRECTLY ATTACHED TO A CARBON ATOM OF THE BENZENE NUCLEUS, WHICH RESIN B CONTAINS NOT MORE THAN 3 PERCENT BY WEIGHT OF VOLATILE INGREDIENTS CAPABLE OF BEING VAPORIZED AND REMOVED BY HEATING THE RESIN AT A TEMPERATURE OF 213*C. AT ONE MILLIMETER ABSOLUTE PRESSURE FOR A TIME OF 25 MINUTES, IS COMPATIBLE WITH RESIN A AND HAS AN AVERAGE MOLECULAR WEIGHT OF NOT MORE THAN ONE-THIRD AS GREAT AS THE AVERAGE MOLECULAR WEIGHT OF RESIN A AND HAS A SECOND ORDER TRANSITION TEMPERATURE AT LEAST AS HIGH AS 45*C. AND NOT MORE THAN 5*C. ABOVE THE SECOND ORDER TRANSITION TEMPERATURE OF RESIN A.