Process for preparing polyamides having a modified dye affinity
AssigneeMontedison S.p.A.
InventorsGianfranco Merani, Giuseppe Anzuino
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Abstract
Polyamides having a modified dye affinity are disclosed as prepared by polymerizing polyamide-forming monomers with a mixture consisting or consisting essentially of a dicarboxylic acid having the general formula HOOC--R--COOH, in which R is an aromatic, cyclo-aliphatic or aliphatic radical, and of a salt of a sulphonic dicarboxylic acid having the general formula: ##STR1## in which R has the meaning specified hereinbefore, X is an alkali or alkaline earth metal or ammonium, and n is a whole number from 1 to 4.
Claims10
A process for preparing a fiber-forming polyamide having a modified dye affinity and no affinity for acid dyes and no affinity for basic dyes, which comprises polymerizing a composition of at least one polyamide-forming monomer and 1-45 millimols/kg monomer of a modifier composition consisting essentially of a mixture of a dicarboxylic acid having the general formula
- HOOC--R--COOH (I)
- wherein R is a simple or simply substituted aromatic radical having 6 to 18 carbon atoms, cycloaliphatic radical having 4 to 18 carbon atoms, or an alkylene radical having 1 to 12 carbon atoums, and
- a salt of a sulphonated dicarboxylic acid having the general formula:
- ##STR4## wherein R has the meaning specified hereinabove, X is an alkali or alkaline earth metal or ammonium radical, and n is an integer from 1 to 4, in which the molar ratio between the salt of the sulphonated dicarboxylic acid and the dicarboxylic acid, ##STR5## ranges from 0.01 to 1.
Dependencies are inferred from the claim text.