Conditioning and opt. modification of pigment or disperse dyestuff - by treatment with liquid ammonia opt. contg. additive, useful in polymers

摘要

Conditioning of a pigment or disperse dyestuff is carried out by treatment with liq. NH3. Pref. the NH3 is evapd. after treatment, which is carried out at elevated pressure and/or temp. and in the absence of water and/or organic solvent. Pref. the liq. NH3 contains a dissolved additive, pref. an acid resin or sulphonamide, which is pptd. on evapn. of the NH3. Pref. the pigment is stirred in liq. NH3, filtered off and dried. After this, it can be treated with an organic solvent or water, filtered and dried. The coloristic properties are improved and opt. modified without the use of organic solvent or high temp. The treatment is specified for use with organic pigments, esp. isoindolinone, azo, metal complex, quinacridone and quinophthalone pigments. The treated pigment is specified for colouring high mol. materials. These include cellulose ethers and esters, natural and synthetic resins, e.g. aminoplasts, alkyd resins, phenolics, polycarbonates, polyolefins (polystyrene, PVC, polyethylene, polypropylene), polyurethanes, polyacrylonitrile, polyacrylic esters, polyamides, polyesters, gums, casein and/or silicone (resins), which can be in the form of plastics, melts, spinning solns., lacquers, paints or printing inks.