Polymer recycling by selective dissolution

Details Polymer recycling by selective dissolution Polymer recycling by selective dissolution

1989-09-11

1993-03-30

Teskin, Fred

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Process of treating scrap or waste product containing solid...

521 40, 521 405, 521 46, 521 47, 521 48, 525191, 525197, 528494, 528491, 528497, 528501, 264 37, 523340, C08J 1108, C08F 604

Patent

active

051984717

ABSTRACT:
A method for separating polymers from a physically commingled solid mixture containing a plurality of polymers comprises dissolving a first one of the polymers in a solvent at a first lower temperature to form a first preferably single phase solution and a remaining solid component. The solid component contains additional polymers which are not soluable to the solvent at the first temperature but which may be soluble at higher temperatures. The method includes subsequently heating the solvent to dissolve additional polymer from the solid component to form subsequent solutions. The polymers are then separated from their respective solution either using flash evaporation techniques when more than one polymer has been dissolved at a single temperature, or conventional techniques for extracting a polymer from a solvent in a solution.

REFERENCES:
patent: 4031039 (1977-06-01), Mizumoto et al.
patent: 4594371 (1986-06-01), Nauman
F. W. Billmeyer, Jr., Textbook of Polymer Science (2nd ed.) J. Wiley and Sons, N.Y., 51, 1971.
"Recycling of Thermoplastic Waste: Phase Equilibrium in Polystyrene-PVC-. . . " Polymer Engineering and Science, Apr. 1976, vol. 16, No. 4, pp. 246-251.

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