High temperature polymerization process and vinyl chloride polymer products therefrom
Abstract
Abstract VINYL CHLORIDE, OR MIXTURES THEREOF WITH AT LEAST ONE MONOMER COPOLYMERIZABLE THEREWITH ARE POLYMERIZED IN AQUEOUS SUSPENSION IN THE PRESENCE OF A FREE-RADICAL TYPE INITIATOR, EMPLOYING POLYMERIZATION TEMPERATURE OF FROM 90*C. TO 165*C. AND REACTION PRESSURES RANGING UP TO 5000 P.S.I.G. THE THERMALLY-STABLE POLYMERIC PRODUCTS OBTAINED EXHIBIT USEFUL PROPERTIES, ALTHROUGH OF EXTERMELY LOW AVERAGE MOLECULAR WEIGHT. IN THE PROCESS, PARTICULARLY AT THE UPPER RANGE OF THE POLYMERIZATION TEMPERATURES UTILIZED, ADDITION OF THE VINYL CHLORIDE MONOMER IS FOUND TO PROCEED EQUALLY BY HEAD-TO-HEAD COUPLING (OR TAIL-TOTAIL COUPLING) AS BY THE USUAL HEAD-TO-TAIL ADDITION EFFECTED IN CONVENTIONAL POLYMERIZATION PROCESSES. DEPENDING UPON THEIR COMPOSITION, THE VINYL CHLORIDE POLYMER PRODUCTS ARE USEFUL, E.G., AS ADHESIVES, AS FLAME RETARDANTS, AS PROCESSING AIDS FOR OTHER POLYMERS, AS COATING RESINS AND IN FORMULATIONS FOR VINYL FOAM AND FLOORING PRODUCTS.
Inventors
- 👤 J Dietrich
Bibliographic Details
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