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Treatment of synthetic polymeric materials to impart dye affinity thereto

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1. A METHOD OF TREATING AN ACRYLONITRILE POLYMER, WHICH MATERIAL MAY BE FORMED INTO FILAMENTS AND THE LIKE AND WHICH HAS SUBSTANTIALLY NO AFFINITY FOR ACID DYE. STUFFS, TO CONFER UPON THE PRODUCT AN AFFINITY FOR ACID DYESTUFFS WHEN IN THE SOLID STATE, WHICH METHOD COMPRISES HEATING SAID POLYMER IN SOLUTION WITH A HYDROCARBON SULPHONIC ACID AND A HYDROCARBON AMINE SELECTED FROM THE CLASS CONSISTING OF THOSE PRIMARY AND SECONDARY ALIPHATIC AND ALICYCLIC AMINES CONTAINING NOT MORE THAN 10 CARBON ATOMS IN THE MOLECULE, THE COMBINED QUANTITY OF AMINE AND SULPHONIC ACID BEING NOT LESS THAN 23% AND NOT GREATER THAN 75% OF THE WEIGHT OF THE POLYMER, AND REMOVING THE SOLVENT OF THE SAID SOLUTION TO FORM A SOLID COMPOSITION OF THE SAID POLYMER, AMINE AND SULPHONIC ACID.
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