Sulfur dyes
AssigneeClariant Finance (BVI) Limited
InventorsPhilip N. Cote, Xiangfu Lan, Alex I. Shakhnovich, Manuel Jose Domingo
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Abstract
New sulfur dyes comprising in their preparation at least one sulfur dye intermediate of the formula I ##STR1## wherein R and R.sub.1 are independently nitro, nitroso or amino, are produced by including in their preparation at least one modifying agent selected from the group of: A) an aldehyde; B) urea; C) a benzoquinone or naphthoquinone; and D) monoethanolamine or by treating an already prepared sulfur dye involving such an intermediate in its preparation, with at least one aldehyde, benzoquinone or naphthoquinone or with monoethanolamine.
Claims80
A sulfur dye having reactively combined therein:
- 1) at least one sulfur dye intermediate of the formula I:
- ##STR4## wherein R and R.sub.1 are independently nitro, nitroso or amino;
- 2) sulfur or a sulfur compound;
- and 3) at least one modifying agent selected from the group consisting of:
- A) an aldehyde;
- C) a benzoquinone or a naphthoquinone;
- and reaction products of A, or C, the amount of said combined modifying agent representing at least 2% by weight based on the total weight of the sulfur dye.
The process of preparing a sulfur dye comprising forming a mixture comprising at least one modify, agent selected from the group consisting of A) an aldehyde and C) a benzoquinone or a naphthoquinone with 1) a) sulfur or a sulfur compound and b) a sulfur dye intermediate of the formula I:
- ##STR5## wherein R and R.sub.1 are independently nitro, nitroso or amino, or 2) intermediary reaction products of sulfur or a sulfur compound and such sulfur dye intermediate, said intermediary reaction products formed in the presence or absence of such a molding agent, and subjecting the resulting mixture to elevated temperature for a time sufficient to form a sulfur dye, the amount of modifying agent employed in the process being at least 2% by weight based on the total weight of the sulfur dye.
The process of preparing a sulfur dye comprising initiating reaction between a) sulfur or a sulfur compound and b) a sulfur dye intermediate of the formula I:
- ##STR6## wherein R and R.sub.1 are independently nitro, nitroso or amino, to form a first intermediary mixture comprising intermediary reaction products, forming a subsequent reaction mixture comprising such intermediary reaction products and at least one modifying agent selected from the group consisting of:
- A) an aldehyde;
- B) urea;
- and C) a benzoquinone or a naphthoquinone;
- and subjecting said subsequent reaction mixture to elevated temperature conditions for a time sufficient to form a sulfur dye, the total amount of modifying agent employed in such process representing at least 2% by weight of the total weight of the sulfur dye.
The process of 18 in which modifying agent is a benzoquinone or naphthoquinone.
The process of modifying a sulfur dye comprising reacting a) sulfur or a sulfur compound and b) a sulfur dye intermediate of formula I ##STR7## wherein R and R.sub.1 are independently nitro, nitroso or amino, for a time sufficient to form a first sulfur dye, desulfurizing said first sulfur dye, forming a reaction mixture comprising the desulfurized dye and at least one aldehyde, benzoquinone, naphthoquinone or monoethanolamine modifying agent and heating said reaction mixture for a time sufficient to form a modified sulfur dye, the amount of modifying agent in the reaction mixture representing at least 2% by weight based on the total weight of the modified sulfur dye.
The process of preparing a sulfur dye comprising initiating reaction between a) sulfur or a sulfur compound and b) a sulfur dye intermediate of formula I:
- ##STR8## wherein R and R.sub.1 are independently nitro, nitroso or amino to form a first intermediary mixture comprising a coupling mass containing intermediary reaction products, forming a subsequent reaction mixture comprising said coupling mass containing intermediary reaction products and at least one modifying agent selected from the group consisting of A) an aldehyde;
- B) urea;
- and C) a benzoquinone or a naphthoquinone;
- and D) monoethanolamine;
- and heating said subsequent reaction mixture at elevated temperature under pressure in a substantially enclosed reaction vessel for a time sufficient to form a sulfur dye, the total amount of modifying agent employed in such process representing at least 2% by weight of the total weight of the sulfur dye.
Dependencies are inferred from the claim text.