Organic compounds -- part of the class 532-570 series – Organic compounds – Azo
Patent
1990-02-21
1992-07-07
Lee, Mary C.
Organic compounds -- part of the class 532-570 series
Organic compounds
Azo
534864, 534573, 534581, 8526, C09B 6748, C09B 2920, D06P 379
Patent
active
051284545
ABSTRACT:
The invention relates to a novel crystallographic modification (.beta.-modification) of the pigment of the formula I ##STR1## The .beta.-modification shows reflections in the Cu-K.sub..alpha. radiation X-ray diffraction spectrum at the following diffraction angles 2.theta. (accuracy .+-.0.2.degree.): at 21.95.degree. a maximum of high intensity, at 5.40.degree., 7.30.degree., 10.85.degree., 14.50.degree. and 27.60.degree. maxima of medium intensity and at 10.05.degree., 12.80.degree., 16.40.degree., 17.95.degree., 24.65.degree. and 25.80.degree. maxima of low intensity.
The .beta.-modification is obtainable by coupling diazotized N-(3-amino-4-methylbenzoyl)-sulfanilic acid in an aqueous medium in the presence or absence of an organic solvent onto alkali-dissolved 2-hydroxy-4'-methoxy-3-naphthanilide and laking the coupling product by adding a calcium salt, at least one cation-active surfactant having been added at the latest prior to laking, and heating an aqueous suspension of the laked azo dye at a temperature of 130.degree. to 180.degree. C.
The .beta.-modification is suitable for pigmenting printing inks, surface coatings, plastic compositions, filaments and paper, in particular for pigmenting polystyrene, copolymers based on polystyrene, polyolefins, copolymers of polyolefins and polyvinyl chloride.
REFERENCES:
patent: 2687410 (1954-08-01), Hanke
patent: 3118870 (1964-01-01), Dietz et al.
patent: 3928315 (1975-12-01), Ribka
patent: 3997523 (1976-12-01), Laubert et al.
patent: 4002605 (1977-01-01), Balsley et al.
patent: 4056522 (1977-11-01), Hunger et al.
patent: 4719292 (1988-01-01), Schui et al.
Biedbrmann, J. Soc. Dyers and Colorists, vol. 87, pp. 105 to 111 (1971).
Hoechst Aktiengesellschaft
Lee Mary C.
Powers Fiona T.
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