Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1992-08-14
1994-02-01
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
526 65, 528323, C08G 6916
Patent
active
052833151
ABSTRACT:
A continuous polymerization method for laurolactam which has three stages. A prepolymerization process include steps of preliminarily heating laurolactam with 1 to 10% weight of water added, thereafter continuously feeding and passing the laurolactam from the upper part of the lower part of the longitudinal-type polymerization reaction zone, arranging a temperature decreasing gradient of 10.degree. C. or more than the upper part to the lower part directions at a polymerization temperature of 250.degree. and 300.degree. C. in the polymerization zone, and polymerizing the laurolactam under vapor pressure up to a conversion rate of 99.5% or more. A intermediate process has a step of releasing pressure from the prepolymerization product from the prepolymerization process for conversion into an intermediate product at atmospheric pressure. A post polymerization process includes the steps of continuously feeding the intermediate product at atmospheric pressure from the intermediate process in the direction from one end of the lower end to the other lower end of the traverse-type polymerization zone, polymerizing the intermediate product with agitation and air discharge in the presence of inert gas under reduced pressure or atmospheric pressure to a final relative viscosity of .eta..sub..zeta. of 1.9 to 3.3.
REFERENCES:
patent: 3317482 (1967-05-01), Kunde et al.
Patent Abstract of Japan; vol. 13, No. 241 (C-604) (3589) Jun. 6, 1989 & JP-A-01 051 433 (Ube Industries Limited).
Patent Abstract of Japan; vol. 6, No. 127 (C-113) (1005) Jun. 13, 1982 & JP-57 053 532 (Ube Industries Limited).
SRI Report, vol. 94, pp. 347-353 (1974).
Kawakami Atsuo
Shimada Toshiro
Tsumiyama Tatsuo
Yamaguchi Hisaya
Anderson Harold D.
Ube Industries Ltd.
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