Metal-free, substituted phthalocyanines in the .chi.-modification
AssigneeBayer Aktiengesellschaft
InventorsGunther Beck, Bernd Kaletta
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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.
Claims4
A metal-free phthalocyanine in the .chi.-modification having the formula ##STR4## in which R represents fluorine, chlorine, bromine, iodine, --CN, --NO.sub.2 , --CF.sub.3, OR.sup.2, --SR.sup.2, --COOR.sup.2, --CON (R.sup.2) (R.sup.3), -N (R.sup.) (R.sup.), and C.sub.1 -C.sub.4 -alkyl, and is bound in the ortho position, and
- R.sup.2 and R.sup.3, independently of each other, represent hydrogen or C.sub.1 -C.sub.4 -alkyl, and
- n is from 0.1 to 4.0 and represents a statistical degree of substitution.
Dependencies are inferred from the claim text.