Method of making and storing compositions comprising thermoplastic resins and normally gaseous solvents

Claim 1

A METHOD OF MAKING A HOMOGENEOUS COMPOSITION OF A THERMOPLASTIC RESIN AND A NORMALLY GASEOUS AGENT WHICH COMPRISES THE STEPS OF FEEDING A MOLTEN THERMOPLASTIC RESIN TO A MIXING ZONE AT AN APPLIED PRESSURE SUCH AS TO FORM WITHIN THE INLET TO SAID ZONE A PLASTIC SEAL AGAINST APPRECIABLE COUNTER-CURRENT LEAKAGE OF GAS FROM THE MIXING ZONE, FEEDING A RESIN-SOLUBLE NORMALLY GASEOUS AGENT AT SUPERATMOSPHERIC PRESSURE AND IN CONTINUOUS MANNER INTO ADMIXTURE WITH THE THERMOPLASTIC RESIN IN THE MIXING ZONE, AGITATING THE MIXTURE OF THERMOPLASTIC RESIN AND NORMALLY GASEOUS AGENT UNDER PRESSURE WHILE COOLING THE MIXTURE TO A TEMPERATURE AT WHICH IT REMAINS FLOWABLE AND SUCH THAT THE NORMALLY GASEOUS AGENT IS IN NON-GASEOUS FORM AT THE PRESSURE THUS APPLIED TO THE MIXTURE, AND CHARGING THE RESULTANT COMPOSITION INTO A VESSEL WHERE IT IS STORED AT A PRESSURE SUFFICIENT TO MAINTAIN THE COMPOSITION AS A SOLUTION OF THE NORMALLY GASEOUS AGENT AND RESIN.

Claim 2

A METHOD OF MAKING A HOMOGENEOUS COMPOSITION OF A THERMOPLASTIC RESIN AND A NORMALLY GASEOUS AGENT WHICH COMPRISES THE STEPS OF FEEDING A MOLTEN THERMOPLASTIC RESIN TO A MIXING ZONE AT AN APPLIED PRESSURE SUCH AS TO FORM WITHIN THE INLET TO SAID ZONE A PLASTIC SEAL AGAINST APPRECIABLE COUNTER-CURRENT LEAKAGE OF GAS FROM THE MIXING ZONE, FEEDING A RESIN-SOLUBLE NORMALLY GASEOUS AGENT AT SUPERATMOSPHERIC PRESSURE AND IN CONTINUOUS MANNER INTO ADMIXTURE WITH THE THERMOPLASTIC RESIN IN THE MIXING ZONE, AGITATING THE MIXTURE OF THERMOPLASTIC RESIN AND NORMALLY GASEOUS AGENT UNDER PRESSURE WHILE COOLING THE MIXTURE TO A TEMPERATURE AT WHICH IT REMAINS FLOWABLE AND SUCH THAT THE NORMALLY GASEOUS AGENT IS IN NON-GASEOUS FORM AT THE PRESSURE THUS APPLIED TO THE MIXTURE, AND CHARGING THE RESULTANT COMPOSITION INTO A VESSEL WHERE IT IS STORED AT A PRESSURE SUFFICIENT TO MAINTAIN THE COMPOSITION AS A SOLUTION OF THE NORMALLY GASEOUS AGENT AND RESIN.