PATENT ASSIGNEE'S COUNTRY | Germany |
UPDATE | 08.99 |
PATENT ASSIGNEE | This data is not available for free |
PATENT CLAIMS |
Process for prepg metal-free phthalocyanine with control of polymorph by reductive cyclization of phthalonitrile in presen ce of an aliphatic alc., redox catalyst & inorg. base - Effecting the cyclization in presence of phthalocyanine-sul fonic acid etc |
PATENT PHOTOCOPY | Available on request |
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