Continuous production of polycaprolactam having a regulated amin

Details Continuous production of polycaprolactam having a regulated amin Continuous production of polycaprolactam having a regulated amin

1991-06-11

1992-09-22

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

528323, C08G 6916

Patent

active

051497581

ABSTRACT:
Polycaprolactam having a regulated amino end group content is produced in a continuous process in which caprolactam is polymerized at 240.degree.-290.degree. C. in the presence of water as initiator and in the presence of a dicarboxylic acid as chain regulator by polymerizing caprolactam in a single stage in the presence of from 0.3 to 5% by weight of water and from 0.1 to 0.6% by weight of terephthalic acid and/or isophthalic acid, each percentage being based on caprolactam, at a uniform pressure through the entire polymerization time of from 1.0 to 1.9 bar, measured in the vapor phase above the polymerization zone, while maintaining a water content of from 0.1 to 0.5% by weight, until the sum total of the amino and carboxyl end group contents is from 115 to 150 meq/kg, with the proviso that the amino end group content does not drop below 25 meq/kg, measured on extracted polycaprolactam.

REFERENCES:
patent: 3386967 (1968-06-01), Twilley
patent: 3839530 (1974-10-01), Bingham et al.

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