Method of preparing triarylmethane dyes and pigments

Details Method of preparing triarylmethane dyes and pigments Method of preparing triarylmethane dyes and pigments

1994-12-22

1997-01-14

Klemanski, Helene

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

552110, C08K 516

Patent

active

055934919

ABSTRACT:
A method or preparing triarylmethane dyes and pigments is disclosed. An amino-substituted triarylmethane compound is reacted with a primary or secondary aromatic amine in solvent using an acid catalyst until a composition having a desired hue is obtained. This composition is then vacuum distilled to remove the solvent and any unreacted aromatic amine, yielding a molten composition having a temperature of at least 165.degree. C. The molten composition is then cooled under conditions such that a temperature of at least 165.degree. C. is maintained for at least 1 hour. A group IA or group II metal hydroxide is added to the composition after the desired hue has been reached, either before, during, or after the vacuum distillation.

REFERENCES:
patent: 3925094 (1975-12-01), Papenfuss et al.
patent: 4041054 (1977-08-01), Hahnke et al.
patent: 4062877 (1977-12-01), Hahnke et al.
patent: 4444592 (1984-04-01), Ludwig
patent: 4678613 (1987-07-01), Flores
patent: 5199985 (1993-04-01), Schneider et al.
patent: 5279655 (1994-01-01), Takazawa et al.

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