Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Patent
1975-10-08
1978-05-30
Henderson, Jr., Christopher A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
260 296PT, 526344, 528503, C08F 616, C08F 610, C08F 624
Patent
active
040924718
ABSTRACT:
Unreacted monomer or monomers and any other volatile organic compounds contained in an aqueous dispersion of polymerizate are removed or separated by a method comprising circulating the aqueous polymerizate dispersion from the bottom of its container to the upper part of the container located over the surface of the dispersion via an exterior conduit. The pressure in the container is maintained at a level reduced to about the saturated vapor pressure of water at the temperature of the dispersion. This manner of separation of monomer from polymer serves to improve the working environment as well as the resulting polymer quality, and the monomer or monomers thus recoverd can be advantageously recycled.
REFERENCES:
patent: 3004013 (1961-10-01), Kircher
patent: 3105065 (1963-09-01), Fujii
patent: 3317449 (1967-05-01), Isaacs
patent: 3678021 (1972-07-01), Chatelain
patent: 3793259 (1974-02-01), Brinkmann
Chem. Abst. 67(1967), 100680y.
Arai Shigeru
Ito Ken-ichi
Kurimoto Kazuhiko
Ogawa Kinya
Shirota Yoshihiro
Henderson, Jr. Christopher A.
Shin-Etsu Chemical Co. , Ltd.
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