Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Process of treating scrap or waste product containing solid...
Patent
1997-12-12
2000-03-07
Seidleck, James J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Process of treating scrap or waste product containing solid...
521 48, 528196, 528480, 525461, 525439, C08J 1104, C08J 1120
Patent
active
060341424
ABSTRACT:
Polycarbonates are recycled without the need for chemical modification by dissolution in a solvent followed by removal of any insoluble materials and precipitation by addition of a non-solvent. The precipitation step may be followed by solid state polymerization of the recycled polycarbonate. Particularly when solid state polymerization is to be performed, the use of a combination of solvent and non-solvent which produces a crystalline intermediate is performed, and use of a modifying reagent increasing the hydroxy end group concentration of the polycarbonate may be advantageous.
REFERENCES:
patent: 4948871 (1990-08-01), Fukuoka et al.
patent: 5204377 (1993-04-01), Fukuoka et al.
patent: 5266659 (1993-11-01), Sivaram et al.
patent: 5652275 (1997-07-01), Buysch et al.
patent: 5717056 (1998-02-01), Varadarajan et al.
Idage Bhaskar Bhairavnath
King, Jr. Joseph Anthony
Ranade Vishnu Ramchandra
Sivaram Swaminathan
Varadarajan Godavarthi Satyanarayana
Asinovsky Olga
Barker Robert T.
General Electric Company
Johnson Noreen C.
Seidleck James J.
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