Claims
- 1. A process for the preparation of a brilliant, easily dispersible and low-hiding to extremely high-hiding pigmentary form of an isoindoline pigment of the formula ##STR7## wherein A is ##STR8## or is a substituted or unsubstituted barbituric acid radical, and B is a substituted or unsubstituted barbituric acid radical, which comprises
- subjecting a suspension which consist essentially of the agglomerated crude pigment, in which the primary particles have a mean particle size of .ltoreq.0.1 .mu.m to shearing forces in water in the presence of grinding media or in a kneader,
- thereafter heating the resulting aqueous suspension at from 90 to 160 C in the presence or absence of a surfactant, for 1-30 hours and isolating the resulting pigment.
- 2. A process as claimed in claim 1, wherein an agglomerated crude pigment in which the primary particles have a mean particle size of .ltoreq.0.02 .mu.m, is employed.
- 3. A process as claimed in claim 1 or 2, wherein the shearing forces are generated in the aqueous suspension of the fine-particled agglomerated crude pigment by means of agitated milling bodies.
- 4. A process as claimed in claim 1 or 2, wherein a crude pigment is used in which A is ##STR9## and B is a radical of unsubstituted barbituric acid, of N-phenylbarbituric acid, of 2-thiobarbituric acid, of 2-iminobarbituric acid or of 2-N-cyanoiminobarbituric acid, or A and B are each one of the radicals mentioned in the definition of B.
- 5. A process as claimed in claim 1 or 2, wherein A and B are each a radical of unsubstituted barbituric acid or A is ##STR10## and B is the radical of unsubstituted barbituric acid.
- 6. A process as claimed in claim 1 or 2, wherein the aqueous suspension is heated in the presence of an adduct of ethylene oxide, propylene oxide or propylene oxide and ethylene oxide with a C.sub.8 -C.sub.20 -alkanol, C.sub.2 -C.sub.10 -alkanediol, C.sub.3 -C.sub.10 -alkanepolyol, phenol, C.sub.6 -C.sub.18 -alkylphenol, C.sub.8 -C.sub.20 -carboxylic acid, C.sub.8 -C.sub.20 -carboxylic acid amide or aliphatic, cycloaliphatic or benzene-aromatic monoamine, diamine or polyamine.
- 7. A process as claimed in claim 1 or 2, wherein the aqueous suspension is heated in the presence of an alkali metal salt or ammonium salt of a C.sub.4 -C.sub.20 -alkylbenzenesulfonic acid, C.sub.4 -C.sub.20 -alkylphenolsulfonic acid, mono- or bis-C.sub.1 -C.sub.10 -alkylnaphthalenesulfonic acid, partially sulfonated polystyrene, water-soluble condensation product of .beta.-naphthalenesulfonic acid or of a C.sub.1 -C.sub.10 -alkylnaphthalene-.beta.-sulfonic acid, or of a mixture of these, with formaldehyde, condensation product of a phenolsulfonic acid, formaldehyde and urea, ligninsulfonic acid or C.sub.7 -C.sub.20 -rosin acid.
- 8. A process as claimed in claim 4, wherein the aqueous suspension is heated in the presence of an alkali metal or ammonium salt of a C.sub.1 -C.sub.5 -alkylnaphthalenesulfonic acid, a condensation product of phenol, urea and formaldehyde, an adduct of ethylene oxide, propylene oxide or propylene oxide and ethylene oxide with a C.sub.2 -C.sub.20 -alkanol, C.sub.3 -C.sub.10 -alkanediol, aliphatic C.sub.1 -C.sub.20 -carboxylic acid or aliphatic C.sub.1 -C.sub.20 -carboxylic acid amide, C.sub.10 -C.sub.20 -fatty alcohol or a mixture of the said agents as the surfactant.
- 9. A process as claimed in claim 8, wherein the amount of surfactant, based on crude pigment, is from 1 to 100% by weight.
- 10. The process of claim 1, wherein said heating is carried out for 1-10 hours.
Priority Claims (1)
Number |
Date |
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Kind |
2800815 |
Jan 1978 |
DEX |
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Parent Case Info
This is a continuation of application Ser. No. 1272, filed Jan. 5, 1979, now U.S. Pat. No. 4,271,301.
US Referenced Citations (5)
Continuations (1)
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1272 |
Jan 1979 |
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