Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1977-04-29
1979-02-13
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528315, 528326, C08G 6924
Patent
active
041396960
ABSTRACT:
2-Pyrrolidone is continuously polymerized to a high-molecular-weight particulate product by the stirred polymerization of the carbonated alkaline polymerizate. The polymerizate is prepared by contacting an aqueous hydroxide with excess 2-pyrrolidone, maintaining the resultant alkaline mixture at an elevated temperature for sufficient time to reduce the 2-pyrrolidone dimer content of the mixture to within the desired limits, dehydrating the alkaline mixture to reduce the water content to within the desired limits, and contacting the alkaline mixture with carbon dioxide to form the carbonated alkaline polymerizate. The paste of particular polypyrrolidone and liquid polymerizate is continuously withdrawn from the reactor, neutralized with aqueous acid and washed with warm water.
REFERENCES:
patent: 3184476 (1965-05-01), Wingfield et al.
patent: 3213066 (1965-10-01), Renfrew
patent: 3681293 (1972-08-01), Jarovitzky et al.
patent: 3778402 (1973-12-01), Kimura et al.
Anshus Byron E.
Katsumoto Kiyoshi
Serkes Ira M.
Anderson Harold D.
Chevron Research Company
DeJonghe T. G.
Newell D. A.
Squires Lawrence S.
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