摘要:
The invention relates to a process for preparing pigments, which comprises
subjecting a crude pigment or mixture of crude pigments and a crystalline inorganic salt or mixture of crystalline inorganic salts together, essentially in the absence of other constituents, to the action of a rotor having a tangential speed of at least 10 m/s, so that a temperature of at least 80°C is attained by means of friction effects; and subsequently kneading the product of this treatment with an organic liquid, during which it is possible if desired to add additional substances selected from the group consisting of inorganic salts, inert additives and colorants.
These pigments and their use in polymers, printing inks and colours filters are also claimed.
摘要:
The invention relates to substantially crystalline organic pigments of the quinacridone, anthraquinone, perylene, indigo, quinophthalone, indanthrone, isoindolinone, isoindoline, dioxazine, azo, phthalocyanine or diketopyrrolopyrrole series consisting of particles of average size from 0.01 µm to 0.12 µm, having a full width at half maximum of a a CuK α radiation X-ray powder diagram of from 0 to 0.68 °2θ and prepared by a process which comprises
subjecting a crude pigment or mixture of crude pigments and a crystalline inorganic salt or mixture of crystalline inorganic salts together, essentially in the absence of other constituents, to the action of a rotor having a tangential speed of at least 10 m/s, so that a temperature of at least 80°C is attained by means of friction effects; and subsequently kneading the product of this treatment with an organic liquid, during which it is possible if desired to add additional substances selected from the group consisting of inorganic salts, inert additives and colorants.
The use of these pigments in polymers, printing inks and colours filters is also claimed. The invention in particular relates to a highly crystalline novel form of Pigment Red 254 (II), obtained by above-mentioned process, and having a steep slope on the bathochromic side of the absorption spectrum's maximum, and the use thereof in particular in colour filters.