Photochemically stabilized polyamide compositions
AssigneeBASF SE
InventorsDean R. Gadoury, Bobby J. Bailey
Life of this patent
Estimating the term…
Abstract
A process for preparing photochemically stable dyed nylon compositions includes providing to a dyebath a shaped article of poly(epsilon-caprolactam) hydrolytically polymerized in the presence of water, a carboxylic acid chain regulator and a hindered piperidine derivative; and in the dyebath, dyeing the shaped article with one or more metalized or nonmetalized acid dyestuffs.
Claims12
A photochemically stabilized nylon article comprising an article shaped from a polymer formed by hydrolytically polymerizing epsilon-caprolactam in the presence of water and at least one hindered piperidine derivative selected from the group consisting of:
- 3 amino-2,2',6,6'-tetramethylpiperidine:
- 4 amino-2,2',6,6'-tetramethylpiperidine;
- 4-(aminoalkyl)-2,2',6,6'-tetramethylpiperidine;
- 4-(aminoaryl)-2,2',6,6'-tetramethylpiperidine;
- 3-(aminoalkyl)-2,2',6,6'-tetramethylpiperidine;
- 3-(aminoaryl)-2,2',6,6'-tetramethylpiperidine;
- 2,2',6,6'-tetramethyl-4-piperidinealkylcarboxylic acid;
- 2,2',6,6'-tetramethyl-4-piperidinearylcarboxylic acid;
- 2,2',6,6'-tetramethyl-3-piperidinealkylcarboxylic acid;
- and
- 2,2',6,6'-tetramethyl-3-piperidinearylcarboxylic acid;
- and dyed with at least one metalized acid or with at least one nonmetalized acid dyestuff.
Dependencies are inferred from the claim text.