Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Process of treating scrap or waste product containing solid...
Patent
1996-04-10
1999-09-28
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Process of treating scrap or waste product containing solid...
528489, C08J 1104
Patent
active
059589876
ABSTRACT:
The present invention is directed to a process for separating polyester, and particularly polyethylene terephthalate, from various contaminants and impurities. In general, the process includes the steps of contacting materials containing polyester with an alkaline composition to form a mixture. The mixture is heated causing some of the impurities to be chemically modified into a more separable form. During heating, a portion of the polyester may also be saponified. After heating, the mixture can be washed with water and the polyester can be easily separated from the remaining impurities. Through the process of the present invention, polyester can be separated and recovered from waste materials containing polyvinyl chloride and aluminum. The process is also effective at removing coatings adhered to the polyester and at removing entrained organic and inorganic compounds contained within the polyester.
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King Richard Perrett
Schwartz, Jr. John A.
Michl Paul R.
The Coca-Cola Company
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