Method and apparatus for reprocessing solid polyester material

Details Method and apparatus for reprocessing solid polyester material Method and apparatus for reprocessing solid polyester material

1994-04-29

1997-01-28

Foelak, Morton

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

Synthetic resins

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

521 44, 521 48, C08J 1104

Patent

active

055978525

ABSTRACT:
A method to work-up waste material of polyethylene terephthalate (PET) in solid form and having a high initial viscosity for multivalent reuse and to recondense it to a high viscosity. The method includes the chemical regeneration and conversion of the recyclate in a mixture with a primary component in continuous and batchwise systems to form a homogenous product. The material to be reprocessed is heated in a stream of gas, crystallized, and dried. The solid-phase condensation is concluded in a stream of gas at high temperature. A transformation process is carried out by mixing the recycling material after treatment with a second component containing hydroxyl end groups.

REFERENCES:
patent: 4485196 (1984-11-01), Speranza et al.
patent: 5236959 (1993-08-01), Oakley et al.
patent: 5252615 (1993-10-01), Rao et al.
patent: 5266601 (1993-11-01), Kyber et al.
patent: 5308892 (1994-05-01), Zickler et al.

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