Molecular weight controllers combination for caprolactam polymer

Details Molecular weight controllers combination for caprolactam polymer Molecular weight controllers combination for caprolactam polymer

1983-12-28

1986-03-04

Anderson, Harold D.

Compositions

Reductive bleachant, deoxidant, reductant, or generative

Sulfur containing reductant, bleachant, deoxidant, or...

528315, 528319, C09K 300, C08G 6916

Patent

active

045740542

ABSTRACT:
The invention is concerned with a combination of molecular weight controllers to be used in the production of a stabilized polyamide having a low content of monomers and oligomers and a high dye-taking capability by polymerization of caprolactam. The combination comprises: (a) a primary monofunctional amine having its boiling point at 180.degree. C. above, and a basic dissociation constant K.sub.b .gtoreq.1.7.times.10.sup.-5 ; (b) a monofunctional organic acid having a K.sub.a >1.5.times.10.sup.-5 ; and (c) an aminoacid containing at least ten carbon atoms having the --NH.sub.2 group salified by a monofunctional organic or inorganic acid which has K.sub.a >1.0.times.10.sup.-2. With this combination, a polyamide is obtained which, following residence in the molten state, has a monomer content of 0.25% or less and a dimer content of 0.15% or less.

REFERENCES:
patent: 3893981 (1975-07-01), Thoma et al.

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