Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Patent
1976-03-25
1978-08-01
Henderson, Jr., Christopher A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
526344, 528501, C08F 624, C08F 600
Patent
active
041044592
ABSTRACT:
A method for reducing the vinyl chloride monomer content of polyvinyl chloride resins. The polyvinyl chloride-water slurry is placed in a vessel, and heat is applied to the vessel for a sufficient time to raise it to a suitable temperature for removal of vinyl chloride monomer from the resin. The resin slurry is agitated and also subjected to a vacuum to reduce the temperature during the heat stripping step. In a preferred method, the polvinyl chloride-water slurry is agitated in a closed vessel, heat is applied to rapidly heat the slurry to a temperature of at least about 50.degree. C, and vacuum is applied to the vessel. The slurry is then rapidly cooled by suitable means. The slurry is then dewatered and dried. Dried polyvinyl chloride resins produced by this process have been found to have a vinyl chloride monomer content below a detectable limit of about 2.0 ppm.
REFERENCES:
patent: 2482038 (1949-09-01), Temple
patent: 3052663 (1962-09-01), Bodlaender
patent: 3644319 (1972-02-01), Seki
patent: 3954910 (1976-05-01), Kropp
patent: 3956249 (1976-05-01), Goodman
Hornbaker Edwin D.
Nugent, Jr. Adam
Ethyl Corporation
Henderson, Jr. Christopher A.
Johnson Donald L.
Mays E. Donald
Sieberth John F.
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