Process for coloring fibre forming polyamides in the melt with a

Details Process for coloring fibre forming polyamides in the melt with a Process for coloring fibre forming polyamides in the melt with a

1981-08-10

1983-01-25

Jacobs, Lewis T.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524606, C08L 7700

Patent

active

043704310

ABSTRACT:
The invention relates to a process for coloring polyamides in the melt with azo pigments of the formula ##STR1## wherein A is the radical of a diazo or tetraazo component, R.sub.1, R.sub.2 and R.sub.3 are hydrogen atoms or alkyl, cyclo alkyl, phenylalkyl or aryl radicals, and n is 1 or 2.
Articles colored with the pigments have level, strong yellow shades of excellent fastness to light, wet processing, rubbing and thermofixation.

REFERENCES:
patent: 3573272 (1971-03-01), Kaupp et al.
patent: 3598801 (1971-08-01), Beffa et al.
patent: 3974123 (1976-08-01), Dehnert et al.
patent: 4340430 (1982-07-01), Roueche
CA, 82, 87169b (1975).

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