Reactive mixtures of thermoplastic vinyl chloride polymers with reactive plasticizers

Abstract

Abstract REACTIVE MIXTURES OF PASTY CONSISTENCY ARE FORMED BY MIXING THERMOPLASTIC POLYVINYL CHLORIDE PARTICLES WITH REACTIVE PLASTICIZERS SUCH AS A MIXTURE OF ETHYLENE GLYCOL DIMETHACRYLATE AND STYRENE AND FREE-RADICAL GENERATING CATALYST. POWDERED FOR FIBROUS FILLERS ARE DESIRABLY ADDED. ESPECIALLY IF THE MIXTURE IS INITIALLY FLUID. THESE PLASTICIZERS ARE ABSORBED OR ADSORBED INTO THE POLYVINYL CHLORIDE AND THE PROPORTIONS OF PLASTICIZER AND FILLER IS ADJUSTED TO PROVIDE THE DESIRED PASTY MIXTURE. THIS MIXTURE MAY BE CONVERTED TO AN INTERMEDIATE GEL STATE BY HEATING AT A TEMPERATURE AND FOR A TIME INTERVAL, WHICH DOES NOT CAUSE SIGNIFICANT POYMERIZATION. THE GEL PRODUCT IS A FLEXIBLE SOLID WHICH CAN BE CURED AT TEMPERATURES OF 120-200*C. IN PREFERRED PRACTICE, MIXTURE OF DISPERSION GRADE AND SUSPENSION GRADE POLYVINYL CHLORIDE PARTICLES ARE USED TO FORM AN INITIALLY FLUID MIXTURE AND FIBERS ARE MIXED, AND IF NECESSARY THE MIXTURE IS ALLOWED THE THICKEN, TO FORM A NON-FLOWABLE PASTE WHICH IS ENCASED IN PROTECTIVE CELLOPHANE SHEETS AND ROLLED TO SHEET FROM ESSENTIALLY FREE FROM AIR WITH THE RESIN AND FIBERS FLOWING TOGETHER TO MAINTAIN UNIFORM DISTRIBUTION. THIS SHEETED MATERIAL CAN BE GELLED TO STABILIZE IT FOR SUBSEQUENT USE.

Inventors

• 👤 Irving E Muskat

Bibliographic Details