Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1994-07-13
1995-10-31
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
210774, 521138, 521145, 521182, C08J 926
Patent
active
054629730
ABSTRACT:
A method for separating co-mingled polymeric materials, in particular polyethylene terephthalate (PET) and polyvinyl chloride (PVC) is described. The process involves selectively dissolving a supercritical fluid into one of the materials at the appropriate temperature and pressure. Upon rapid reduction of the system pressure, the selected material foams providing a change in density. Under ambient conditions, the polymeric materials having a large density difference can be separated by means of aqueous separation and flotation. The preferred supercritical fluid for the process is carbon dioxide, and PVC is the material into which the supercritical fluid is preferentially dissolved.
REFERENCES:
patent: 4473665 (1984-09-01), Martini-Vvedensky et al.
patent: 5126058 (1992-06-01), Beckman
patent: 5158986 (1992-10-01), Cha et al.
patent: 5196575 (1993-03-01), Sebastian
Nam P. Suh et al., "Synthesis and Analysis of Gas/Polymer Solutions for Ultra-Microcellular Plastics Production", Jan. 1993, In the Proceedings of the 1993 NSF Design and Manufacturing Systems Conference.
Daniel F. Baldwin et al., "Gas Dissolution and Crystallization in Microcellular Thermoplastic Polyesters", 1992, MD-vol. 38, Cellular Polymers ASME 1992.
D. F. Baldwin et al., "Microcellular Poly(ethylene terephthalate) and Crystallizable Poly(ethylene terephthalate): Characterization of Process Variables", 1992, SPE Technical Papers vol. XXXVIII, 1992.
S. W. Cha et al., "Room-Temperature Microcellular Foaming", 1992, SPE Technical Papers vol. XXXVIII, 1992.
Serad George A.
Thornburg Theodore S.
Foelak Morton
Hoechst Celanese Corporation
McCann Philip P.
LandOfFree
Separation of polyethylene terephthalate and polyvinyl chloride does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Separation of polyethylene terephthalate and polyvinyl chloride , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Separation of polyethylene terephthalate and polyvinyl chloride will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1772759