Pigment compositions and processes therefor
AssigneeThe Sherwin-Williams Company
InventorThomas E. Ludwig
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Abstract
This invention relates to novel pigmentary products, particularly valuable in the textile art, prepared by using strong acid solvents to solubilize or form fine colloidal dispersions of normally water-insoluble aryl pararosanilines in an aqueous medium. The aryl pararosaniline which is thus solubilized or dispersed is reacted with a heteropoly acid to produce water-insoluble blue-hued pigments. By various modifications in the process, the pigments can be co-precipitated with other pigments and/or dyes to produce pigments or pigment lakes of different shades and intensities.
Claims25
Blue pigments which comprise the reaction product obtained by dissolving and/or dispersing an essentially water-insoluble aryl pararosaniline in an effective amount of at least one acid solvent and reacting with an approximately chemically equivalent amount of at least one heteropoly acid containing molybdenum and/or tungsten;
- wherein said aryl pararosaniline has the following structure in its carbinol form:
- ##STR3## wherein R.sub.1, R.sub.2 and R.sub.3 are direct linkages, phenyl, or napthyl groups;
- R.sub.4 is hydrogen or methyl;
- X.sub.1, X.sub.2 and X.sub.3 are hydrogen, halogen, nitro, alkyl of 1 to 4 carbons or alkoxy of 1 to 4 carbons;
- provided that at least one of R.sub.1, R.sub.2 and R.sub.3 is not a direct linkage and provided that X.sub.1, X.sub.2 or X.sub.3 is hydrogen when the corresponding R.sub.1, R.sub.2 or R.sub.3 is a direct linkage.
A laked pigment which comprises the reaction product obtained by dissolving and/or dispersing an essentially water-insoluble aryl pararosaniline in an effective amount of at least one acid solvent and reacting the aryl pararosaniline with an approximately chemically equivalent amount of at least one heteropoly acid containing molybdenum and/or tungsten;
- wherein said reaction takes place in the presence of a finely dispersed suspended inert pigment;
- and wherein said aryl pararosaniline has the following structure in its carbinol form;
- ##STR4## wherein R.sub.1, R.sub.2 and R.sub.3 are direct linkages, phenyl, or napthyl groups;
- R.sub.4 is hydrogen or methyl;
- X.sub.1, X.sub.2 and X.sub.3 are hydrogen, halogen, nitro, alkyl of 1 to 4 carbons or alkoxy of 1 to 4 carbons;
- provided that at least one of R.sub.1, R.sub.2 and R.sub.3 is not a direct linkage and provided that X.sub.1, X.sub.2 or X.sub.3 is hydrogen when the corresponding R.sub.1, R.sub.2 or R.sub.3 is a direct linkage.
A process for producing blue pigments which comprises dissolving and/or dispersing an essentially water-insoluble aryl pararosaniline in an effective amount of at least one acid solvent and reacting the aryl pararosaniline with an approximately chemically equivalent amount of at least one heteropoly acid containing molybdenum and/or tungsten;
- wherein said aryl pararosaniline has the following structure in its carbinol form:
- ##STR5## wherein R.sub.1, R.sub.2 and R.sub.3 are direct linkages, phenyl, or napthyl groups;
- R.sub.4 is hydrogen or methyl;
- X.sub.1, X.sub.2 and X.sub.3 are hydrogen, halogen, nitro, alkyl of 1 to 4 carbons or alkoxy of 1 to 4 carbons;
- provided that at least one of R.sub.1, R.sub.2 and R.sub.3 is not a direct linkage and provided that X.sub.1, X.sub.2 or X.sub.3 is hydrogen when the corresponding R.sub.1, R.sub.2 or R.sub.3 is a direct linkage.
A process for preparing pigments which comprise admixing at an effective temperature:
- (a) an aqueous heteropoly acid containing molybdenum and/or tungsten;
- (b) a dispersion or solution which comprises:
- (i) about 1 to about 40 parts of an acid solvent;
- (ii) about 0 to 100 parts water;
- (iii) about 1 part of a reactant mixture which comprises
- (I) about 50 to 100% of an aryl pararosaniline having the following structure in its carbinol form:
- ##STR6## wherein R.sub.1, R.sub.2 and R.sub.3 are direct linkages, phenyl, or napthyl groups;
- R.sub.4 is hydrogen or methyl;
- X.sub.1, X.sub.2 and X.sub.3 are hydrogen, halogen, nitro, alkyl of 1 to 4 carbons or alkoxy of 1 to 4 carbons;
- provided that at least one of R.sub.1, R.sub.2 and R.sub.3 is not a direct linkage and provided that X.sub.1, X.sub.2 or X.sub.3 is hydrogen when the corresponding R.sub.1, R.sub.2 or R.sub.3 is a direct linkage;
- (II) about 0 to 50% of a basic dye;
- (III) about 0 to 50% of a black or chromatic dye or pigment;
- (iv) about 0 to 1 part surfactant;
- wherein the heteropoly acid is present at an approximately chemically equivalent amount to the total equivalents of aryl pararosaniline and basic dye.
A process for the production of laked pigments which comprises dissolving or dispersing an essentially water-insoluble aryl pararosaniline in an effective amount of at least one acid solvent and reacting the aryl pararosaniline with an approximately chemically equivalent amount of at least one heteropoly acid containing molybdenum and/or tungsten;
- wherein said reaction takes place in the presence of a finely dispersed suspended inert pigment;
- and wherein said aryl pararosaniline has the following structure in its carbinol form:
- ##STR7## wherein R.sub.1, R.sub.2 and R.sub.3 are direct linkages, phenyl, or napthyl groups;
- R.sub.4 is hydrogen or methyl;
- X.sub.1, X.sub.2 and X.sub.3 are hydrogen, halogen, nitro, alkyl or 1 to 4 carbons or alkoxy of 1 to 4 carbons;
- provided that at least one of R.sub.1, R.sub.2 and R.sub.3 is not a direct linkage and provided that X.sub.1, X.sub.2 or X.sub.3 is hydrogen when the corresponding R.sub.1, R.sub.2 or R.sub.3 is a direct linkage.
Dependencies are inferred from the claim text.