C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 69/16 (2006.01)
Patent
CA 2044387
Polycaprolactam having a regulated amino end group content is produced in a continuous process in which caprolactam is polymerized at 240-290°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 iso- phthalic acid, each percentage being based on capro- lactam, at a uniform pressure through the entire poly- merization time of from 1.0 to 1.9 bar, measured in the vapor phase above the polymerization zone, while main- taining 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.
Basf Aktiengesellschaft
Matthies Paul
Robic
LandOfFree
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