Process of pigmenting polyamides

Details Process of pigmenting polyamides Process of pigmenting polyamides

C - Chemistry, Metallurgy

08

J

400/7808

C08J 3/20 (2006.01)

Patent

CA 1085529

ABSTRACT An aqueous dispersion of a pigment for use in a polymerization process to produce a pigmented polyamide by addition of the dispersion to the polymer-forming reactants prior to completion of the polymerization is prepared by attrition milling a slurry containing about 70 to 80% by weight of pigment in water in the presence of a dispersing agent to separate agglomerated pigment particles, then with additional milling, mixing the milled slurry with a concen- trated aqueous solution of a nylon salt to flocculate the pigment particles and to form a flocculated dispersion con- taining 25 to 45% pigment.

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