# US 4,374,643 A · Color salts of basic dyes with acidic optical brighteners of stilbene type

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- Number: US 4,374,643 A
- Document ID: US4374643A
- Status: Granted
- Kind: A
- Application number: 06/284,532
- Filed: 1981-07-20
- Granted: 1983-02-22
- Earliest claimed: 1980-07-22
- Assignees: Showa Kagaku Kogyo Company, Ltd.
- Inventors: Kazuaki Suzuki; Shohei Kuwabara
- Web page: https://patentgrep.com/patent/US4374643A

## CPC

- C09B 69/02: Dyestuff salts, e.g. salts of acid dyes with basic dyes
- D06L 4/621: with anionic brighteners
- D06L 4/664: Preparations of optical brighteners; Optical brighteners in aerosol form; Physical treatment of optical brighteners
- C09B: ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES {, e.g. PIGMENTS}; MORDANTS; LAKES (fermentation or enzyme using processes to synthesise a desired chemical compound C12P)
- D06L: DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS

## Abstract

This invention relates to a novel color salt or color complex consisting of an optical brightener component having at least one anionic group and a color component having at least one basic group capable of forming a salt with the anionic group. This color salt is capable of coloring various fibrous articles, paper, pulp, leathers, rubbers, adhesives and plastics in clear and brightened color.

## Claims

### Claim 1

A color salt consisting of a stilbene type optical brightener component having at least one anionic group and a color component having at least one basic group capable of forming a salt with the anionic group.

### Claim 2 (depends on 1)

The color salt of claim 1, wherein the stilbene type optical brightener component has a chemical structure selected from 4,4'-bis-triazinylaminostilbene, 1,2,3-triazolylstilbene, 1,4-bis-styrylbenzene and 4,4'-bis-styrylbiphenylene.

### Claim 3 (depends on 1)

The color salt of claim 1, wherein the anionic group is selected from sulfonic acid group, carboxylic acid group, their alkali metal salt groups and ammonium salt groups.

### Claim 4 (depends on 1)

The color salt of claim 1, wherein the color component has a chemical structure selected from azo, anthraquinone, diphenylmethane, triphenylmethane, xanthene, acridine, azine, oxazine, thiazine, methine and phthalocyanine types.

### Claim 5 (depends on 1)

The color salt of claim 1, wherein the cationic group is selected from cationized alkylamino group, acridine group, oxazine group, azine group, thiazine group and cationized nitrogen atom.

### Claim 6

A process for the production of a color salt, which comprises mixing a solution of an optical brightener having at least one anionic group in water or water and a water-soluble organic solvent and a solution of a coloring agent having at least one basic group capable of forming a salt with the anionic group of the optical brightener in water or water and a water-soluble organic solvent.