Method for directly producing fine-particle diketopyrrolopyrrol pigments

A technology of diketopyrrolopyrrole and pigments, applied in the direction of diketopyrrolopyrrole dyes, pigment pastes, chemical instruments and methods, etc., which can solve the problems that pigments do not always meet all the requirements of the industry

Inactive Publication Date: 2009-12-30
CLARIANT FIANCE (BVI) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these pigments do not always meet all the requirements of the industry

Method used

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  • Method for directly producing fine-particle diketopyrrolopyrrol pigments
  • Method for directly producing fine-particle diketopyrrolopyrrol pigments
  • Method for directly producing fine-particle diketopyrrolopyrrol pigments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] The pigment was prepared analogously to Comparative Example 1, but in which the disodium salt of the pigment was converted into a pigment by suspending the hot disodium salt at 80° C. liquid hydrolysis. After separation and washing with methanol and water, a pigment was obtained which had a maximum value of the frequency distribution (distribution pattern) of crystalline particles at 79 nm and a half width of the frequency distribution of 58 nm. The BET surface area of ​​the pigment is 130m 2 / g.

Embodiment 2

[0084] A pigment was prepared analogously to Example 1, in which 1.8 parts of pigment dispersant (VI) were dispersed in water. After separation and washing with methanol and water, a pigment was obtained which had a maximum value of the frequency distribution (distribution pattern) of crystalline particles at 110 nm and a half width of the frequency distribution of 63 nm. The BET surface area of ​​the pigment is 100m 2 / g.

Embodiment 3

[0086] A pigment was prepared analogously to Example 1, in which 3.7 parts of pigment dispersant (VII) were dispersed in water.

[0087]

[0088] After separation and washing with methanol and water, a pigment was obtained which had a maximum value of the frequency distribution (distribution pattern) of crystalline particles of 100 nm and a half width of the frequency distribution of 79 nm. The BET surface area of ​​the pigment is 107m 2 / g.

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Abstract

The invention relates to a method for directly producing fine-particle 1,4-diketopyrrolo[3,4-c]pyrrols of formula (I), wherein R1a, R1b, R2a and R2b independently represent hydrogen, halogen, C1-C4 alkyl, C1-C4 alkoxy, cyano or phenyl, the compounds being characterized by a maximum frequency distribution between 20 and 120nm. According to the method, nitriles are reacted with succinic acid esters or lactames or enamines in an alkali medium to form a pigment alkali salt, and then protolysis of the pigment alkali salt is carried out. The method is characterized in that an effective quantity of a pigment dispersant of formula (II) is added during the protolysis of the pigment alkali salt. In formula (II), Q is a radical of an organic pigment from the group of perinone, quinacridone, quinacridonquinone, anthanthrone, indanthrone, dioxazine, diketopyrrolopyrrol, indigo, thioindigo, thiazineindigo, isoindoline, isoindolinone, pyranthrone, isoviolanthrone, flavanthrone or anthrapyrimidine pigments.

Description

Background technique [0001] Pigment dispersants are pigments substituted by groups with specific reactivity. Pigment dispersants are often subsequently added to the pigments to facilitate dispersion in the application medium, especially in paints, printing inks and liquid inks (tints), and to improve the rheological and color properties of the pigments. Tinting strength, transparency and gloss, for example in many applications, can thereby be increased. For example, for the production of color filters, especially finely divided pigments are used in order to largely exclude particle scattering which leads to a reduction in the contrast ratio. [0002] WO 01 / 04215 discloses finely divided diketopyrrolopyrrole pigments which are characterized by a particularly narrow particle size distribution together with high crystallinity and specific absorption properties. Such C.I. Pigment Red 254 can be obtained by first stirring the crude pigment with the inorganic salt under dry condit...

Claims

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Application Information

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IPC IPC(8): C09B57/00C09B67/08C09D5/00G02B5/22
CPCC09D7/007C09B67/0005C09B57/004C09D17/003C09D11/037C09D11/322B82Y30/00C09D7/41
Inventor M·甘朔
Owner CLARIANT FIANCE (BVI) LTD
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