Method for producing a liquid formulation of salts of sulfoacidic azo dyes
AssigneeBASF SE
InventorsMichael Schmitt, Helmut Reichelt
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Abstract
A process for preparing a liquid formulation of salts of sulfonated azo dyes, comprising a) preparing vesuvin from m-phenylenediamine; b) without interveningly isolating the vesuvin coupling an at least equimolar amount of diazotized aminoarylsulfonic acids I H2N—Ar—SO3H (I), where Ar is phenylene (which may be monosubstituted by sulfo) or naphthalene (which may be mono- or disubstituted by sulfo and/or monosubstituted by hydroxyl) onto vesuvin and c) isolating the dyes in their acid form and subsequently dissolving them in aqueous bases.
Claims12
A process for preparing a liquid formulation of salts of sulfonated azo dye compounds, comprising
- preparing vesuvin from m-phenylenediamine;
- reacting at least an equimolar amount of at least one diazotized aminoarylsulfonic acid with vesuvin to form at least two dye compounds;
- isolating the dye compounds in their acid form;
- and
- dissolving the dye compounds in at least one aqueous base;
- wherein the reaction is performed without isolating the vesuvin,
- wherein the aminoarylsulfonic acid has the formula:
- H2N—Ar—SO3H
- wherein Ar is phenylene.
A process for preparing a liquid formulation of salts of sulfonated azo dye compounds, comprising
- preparing vesuvin from m-phenylenediamine;
- reacting at least an equimolar amount of at least one diazotized aminoarylsulfonic acid with vesuvin to form at least two dye compounds;
- isolating the dye compounds in their acid form;
- and
- dissolving the dye compounds in at least one aqueous base;
- wherein the reaction is performed without isolating the vesuvin,
- wherein the aminoarylsulfonic acid has the formula:
- H2N—Ar—SO3H
- wherein Ar is naphthalene, and
- wherein the aminoarylsulfonic acid is substituted with two additional sulfonic acid groups.
A process for preparing a liquid formulation of salts of sulfonated azo dye compounds, comprising
- preparing vesuvin from m-phenylenediamine;
- reacting at least an equimolar amount of at least one diazotized aminoarylsulfonic acid with vesuvin to form at least two dye compounds;
- isolating the dye compounds in their acid form;
- and
- dissolving the dye compounds in at least one aqueous base;
- wherein the reaction is performed without isolating the vesuvin,
- wherein the aminoarylsulfonic acid has the formula:
- H2N—Ar—SO3H
- wherein Ar is naphthalene, and
- wherein the aminoarylsulfonic acid is substituted with a hydroxyl group.
A process for preparing a liquid formulation of salts of sulfonated azo dye compounds, comprising
- preparing vesuvin from m-phenylenediamine;
- reacting at least an equimolar amount of at least one diazotized aminoarylsulfonic acid with vesuvin to form at least two dye compounds;
- isolating the dye compounds in their acid form;
- and
- dissolving the dye compounds in at least one aqueous base;
- wherein the reaction is performed without isolating the vesuvin,
- wherein the aminoarylsulfonic acid has the formula:
- H2N—Ar—SO3H
- wherein Ar is naphthalene,
- wherein the aminoarylsulfonic acid is substituted with an additional sulfonic acid group, and
- wherein the aminoarylsulfonic acid is additionally substituted with a hydroxyl group.
Dependencies are inferred from the claim text.