Process for improving biodegradability of PVC

Details Process for improving biodegradability of PVC Process for improving biodegradability of PVC

1993-05-18

1994-06-28

Schofer, Joseph L.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528499, C08F 626

Patent

active

053248171

ABSTRACT:
The present invention relates to a process for dehydrochlorinating polyvinylchloride polymers to remove about 30 wt % chlorine therefrom by heating the starting materials PVC and deoxygenated liquid water, preferably neutral liquid water at temperatures from about 200.degree. C. up to the critical temperature of water at autogenous pressure to maintain the water as a liquid phase. The process has utility in recycling by enabling PVC to be dechlorinated specifically by a means that does not release chlorine gas.

REFERENCES:
patent: 3021318 (1957-10-01), Laporta
patent: 3083193 (1958-12-01), Kolner
patent: 3826789 (1974-07-01), Yokokawa
patent: 4051212 (1977-09-01), Grigat et al.
patent: 4136967 (1979-01-01), Grigat et al.
patent: 4423193 (1983-12-01), Melby et al.
patent: 4424340 (1984-01-01), Golstein et al.
EP Search report dated Jun. 17, 1993 for Application No. 92311507.5 (with enclosures cited above).
Chemical Abstracts, vol. 84, No. 45009k Feb. 23, 1976.

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