Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1976-03-25
1978-01-31
DeBenedictis, Sr., Thomas
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C08J 1100, C08J 1102, C08J 1104
Patent
active
040714799
ABSTRACT:
Recompoundable polyvinyl chloride suitable to be recompounded for reuse, for example, in cable and wire production is recovered from a scrap material which includes plasticized polyvinyl chloride. A charge of plasticized polyvinyl chloride scrap material is treated with a solvent such as methyl ethyl ketone, tetrahydrofuran, cyclohexanone or dimethyl formamide to form a solvent mixture with one component thereof being a solvent solution of dissolved vinyl chloride polymer and plasticizers. The mixture is heated and agitated and scrap metal and other gross solids, if present, are removed. Then the solvent mixture is treated with an acid which advantageously causes a flocculation of suspended insolubles such as pigments and fillers. Except when using cyclohexanone as the solvent, the treatment with the acid must be accomplished, unexpectedly, in the presence of an additional flocculating agent such as a cellulose acetate which is soluble in the solution and which is insolubilized by the acid on refluxing. Recompoundable polyvinyl chloride is precipitated out by a non-solvent for the polyvinyl chloride which is miscible with the solvent in substantially all proportions, which will dissolve the plasticizer. The solvent and the non-solvent are removed from the plasticizer and are recovered separately by fractional distillation, for example.
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Broyde Barret
Delles Judith Archer
North Steven Forrest
DeBenedictis, Sr. Thomas
Somers E. W.
Western Electric Company Inc.
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