Metal-free, substituted phthalocyanines in the .chi.-modificatio

Details Metal-free, substituted phthalocyanines in the .chi.-modificatio Metal-free, substituted phthalocyanines in the .chi.-modificatio

1993-05-10

1994-11-22

Shah, Mukund J.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C09B 4730

Patent

active

053670698

ABSTRACT:
Metal-free phthalocyanines in the .chi.-modification substituted in up to four ortho positions can be prepared by tetramerisation of a reaction mixture consisting of phthalonitriles substituted in the 3-position with phthalonitrile in a molar ratio of 4:0 to 1:40 in the presence of a base and subsequent heat treatment at temperatures of between 100.degree. and 300.degree. C. They constitute excellent organic pigments.

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patent: 4946762 (1990-08-01), Albert et al.
Chemical Abstracts, vol. 105, No. 8; Columbus, Ohio; Abstract No. 62214, "High-purity x-type metal-free phthalocyanine", Kinoshita et al., JP 60,243,089 (Dainippon Ink), May 16, 1984.
J. H. Sharp and M. Lardon in "The Journal of Physical Chemistry", vol. 72, 1968, pp. 3230-3235.

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