Process for the preparation of polymeric materials

Abstract

Abstract THE PRESENT INVENTION RELATES TO A PROCESS FOR THE MANUFACTURE OF SHAPED ARTICLES OF A CROSS-LINKED THERMOPLASTIC MATERIAL WHICH PROCESS COMPRISES MIXING A THERMOPLASTIC MATERIAL CAPABLE OF FORMING A FREE RADICAL WITH A CROSSLINKING AGENT, SUBJECTING SAID MATERIAL TO INSTANTANEOUS COMPRESSION AT A PRESSURE IN EXCESS OF 2000 ATMOSPHERES TO EFFECT UNIFORM DISTRIBUTION OF THE CROSS-LINKING AGENT WITHIN SAID THERMOPLASTIC MATERIAL UNDER CONDITIONS SUCH THAT SUBSTANTIAL CROSS-LINKING OF THE THERMOPLASTIC MATERIAL DOES NOT OCCUR, AND THEREAFTER FORMING SHAPES OF THE MIXTURES AND CAUSING OR ALLOWING THE CROSS-LINKING OF THE SHAPED MATERIAL TO TAKE PLACE. THISINVENTION ALSO INCLUDES APPARATUS COMPRISING A PRESSURE CHAMBER, FIRST AND SECOND PRESSURE MEMBERS CAPABLE OF OPERATING TO EXERT PRESSURE WITHIN SAID CHAMBER, MOTOR MEANS FOR SAID FIRST PRESSURE MEMBER ADAPTED TO MOVE SAID FIRST MEMBER IN SAID CHAMBER, INLET MEANS FOR SAID CHAMBER ADAPTED TO BE CLOSED BY SAID FIRST MEMBER AND OUTLET MEANS FOR SAID CHAMBER ADAPTED TO BE CLOSED BY SAID SECOND MEMBER, IN WHICH A MATERIAL INTRODUCED INTO THE CHAMBER IS SUBJECTED TO PRESSURE EXERTED BY SAID FIRST MEMBER AND WHICH WHEN THE PRESSURE EXERTED ON SAID MATERIAL REACHED A PREDETERMINED MAXIMUM THE SECOND PRESSURE MEMBER MOVES TO OPEN THE OUTLET TO PERMIT DISCHARGE OF THE MATERIAL FROM THE CHAMBER.

Inventors

• 👤 Thomas Paul Engel

Bibliographic Details