Vinyl chloride polymer recovery process
Abstract
Abstract REUSABLE VINYL CHLORIDE POLYMER AND COPOLYMER AND OTHER COMPONENTS SUCH AS PLASTICIZERS ARE RECLAINED FROM SCRAP PLASTICS BY CONTACTING THE SCRAP PLASTICS WITH A SOLVENT FOR THE VINYL CHLORIDE POLYMER, CONTACTING THE RESULTING LIQUID PHASE WITH A SUBSTANTIALLY NON-AQUEOUS NON-SOLVENT FOR THE POLYMERIC PORTION, AND THEN SEPARATING THE RESULTING INSOLUBLE PHASE CONTAINING THE VINYL CHLORIDE PO;LYMER. FOLLOWING THE REMOVAL OF THIS POLYMER PORTION, THE FILTRATE IS FRACTIONALLY DISTILLED TO RECOVER THE SOLVENTS, NON-SOLVENTS, PLASTICIZERS AND OTHER INGREDIENTS. TYPICAL SOLVENTS ARE METHYLETHYL KETONE, METHYLISOBUTYL KETONE, CYCLOHEXANONE, DIMETHYL FORMAMIDE, TETRAHYDROFURAN AND ETHYLENE DICHLORIDE. TYPICAL NON-SOLVENTS ARE METHANOL, ETHANOL, ISOPROPANOL AND N-BUTANOK. THE RECORVERED VINYL CHLORIDE POLYMER COMPOSITIONS MAY CONTAIN PIGMENTS AND FILLERS, AND EXHIBIT IMPROVED PERFORMANCE OF RECYCLING IN THE FABRICATION OF PLASTIC ARTICLES.
Inventors
- 👤 E Hafner
Bibliographic Details
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