Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1997-10-10
1998-12-08
Shah, Mukund J.
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
540131, 8402, 8518, 8661, 8919, C09B 4720, C09B 4724
Patent
active
058471138
ABSTRACT:
A process for preparing sulfo-containing copper phthalocyanine dyes having an absorption maximum .lambda..sub.max..gtoreq.605 nm comprises heating copper phthalocyanine with at least 15% strength oleum at about 50.degree.-110.degree. C. until the reaction product has a .lambda..sub.max..gtoreq.605 nm, then diluting the resulting sulfonation product with water, adding a tertiary, lipophilic amine and stirring at elevated temperature until the lipophilic phase comprising the ammonium salt separates from the aqueous sulfuric acid phase, subsequently admixing the lipophilic phase, optionally after washing with water, with a water-soluble base whose sulfonate salt is to be prepared and water, separating the resulting phases and leaving the salt in the aqueous solution or isolating it therefrom.
The products are especially useful for dyeing cellulosic fibers or polyamides.
REFERENCES:
patent: 2490704 (1949-12-01), Paige
patent: 4198203 (1980-04-01), Groll et al.
patent: 4560745 (1985-12-01), Weberndoerfer et al.
patent: 4668789 (1987-05-01), Bermes
BASF - Aktiengesellschaft
Shah Mukund J.
Sripada Pavanaram K
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