Preparation of epsilon copper phthalocyanine of small primary particle size and narrow particle size distribution by kneading

A technology of copper phthalocyanine and particles, which is applied in the direction of organic dyes, photomechanical equipment, photoplate making process of patterned surface, etc., can solve the problems of crystal phase transformation and particle size reduction, multi-time, etc., achieve narrow size distribution, reduce The effect of kneading time and small primary particle size

Active Publication Date: 2010-12-15
SOLVAY SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] However, the aforementioned methods of preparing ε crystal form copper phthalocyanine in the prior art have a problem that they require too much time for crystal phase transformation and particle size reduction

Method used

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  • Preparation of epsilon copper phthalocyanine of small primary particle size and narrow particle size distribution by kneading
  • Preparation of epsilon copper phthalocyanine of small primary particle size and narrow particle size distribution by kneading
  • Preparation of epsilon copper phthalocyanine of small primary particle size and narrow particle size distribution by kneading

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example 1

[0067] The preparation of example 1.ε crystal form copper phthalocyanine

[0068] 1) Crystal phase transformation of copper phthalocyanine from β crystal form to α crystal form

[0069] 80 parts by weight of crude copper phthalocyanine were added to 800 parts by weight of 95 wt% sulfuric acid. Additionally, the resulting mixture was stirred for 3 hours to prepare a suspension or solution of sulfate in sulfuric acid. The suspension or solution was poured into twice as much 8 L of water to obtain an α crystal form copper phthalocyanine, which was then dried in hot air. After pulverizing the resulting solid, it was confirmed by XRD studies that nearly quantitative α crystal form copper phthalocyanine was obtained in terms of crystallization yield.

[0070] 2) Kneading copper phthalocyanine particles for crystal phase transformation from α crystal form to ε crystal form and particle size reduction

[0071] Add 50 parts by weight of the resulting copper phthalocyanine particles ...

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Abstract

A process of preparing copper phthalocyanine particles exhibiting an epsilon crystallographic form, comprising a kneading step by kneading at at least two different temperatures copper phthalocyanine particles wherein more than or equal to 50 wt % of the particles exhibit an alpha crystallographic form in presence of a liquid and of at least one inorganic salt.

Description

[0001] This application claims the benefit of European Patent Application No. 07120738.5 filed November 15, 2007, which is hereby incorporated by reference. technical field [0002] The present invention relates to a method for preparing ε crystal form copper phthalocyanine (ε-CuPc) particles with small primary particle size and narrow particle size distribution, ε crystal form copper phthalocyanine particles obtainable according to the method and their use Use in the manufacture of blue color filter pigments for liquid crystal display (LCD) devices. Background technique [0003] Of all the pigments, copper phthalocyanine is especially stable and excellent in various fastnesses. In addition, copper phthalocyanine has various crystal forms. Among these crystal forms, those known to have found practical use include α, β, and ε crystal forms of copper phthalocyanine. It is common practice to use the beta form to produce a greenish blue and the alpha form to produce a reddish ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B67/04G03F7/00C09B67/12C09B67/22C09B67/50
CPCC09B67/0026C09B67/0016G03F7/0007C09B67/0035C09B67/0002C09B67/0023
Inventor 郑起硕韩尚旻郑铉锡崔一朝金东润郑恩河
Owner SOLVAY SA
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