Colored polymer composition
AssigneeDsm N.V.
InventorGerardus P. T. Vonk
Life of this patent
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Abstract
The invention relates to a colored polymer composition with strongly improved color properties. This improvement is achieved by masking groups in the polymer that are reactive with respect to the colorant with the aid of an effective quantity of a compound suitable for this purpose. The invention is particularly suitable for polyamides, the amino end group content being reduced to less than 20, preferably less than 5 meq/kg, with the aid of acetyl lactam. The thermostability of e.g. CI Pigment Red 209 colored nylon-6 is improved by a factor of 9. The brightness of the color also increases to a surprising extent.
Claims16
Coloured polymer composition comprising a polyamide or a copolymer containing polyamide groups and one or more organic colorants, characterized in that the composition additionally comprises an effective quantity of a compound that masks groups in the polyamide composition that are reactive with respect to the colorant by reacting with said groups.
Process for improving the colourfastness of polymer compositions containing polyamide and colored with organic colorants, characterized in that an effective quantity of a compound which masks groups in the polyamide composition that are reactive with respect to the colorant by reacting with these groups is admixed.
Coloured polyamide composition with improved color fastness, said composition comprising polyamide and one or more organic colorants, wherein the polyamide has an amino end group content of less than 20 meq/kg and the colorfastness of said composition, expressed as .DELTA.E*.sub.ab, is not more than 2.4.
Dependencies are inferred from the claim text.