# US 6,719,922 B1 · Mixtures of fluorescent whitening agents

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- Number: US 6,719,922 B1
- Document ID: US6719922B1
- Status: Granted
- Kind: B1
- Application number: 10/070,631
- Filed: 2002-07-08
- Granted: 2004-04-13
- Earliest claimed: 1999-09-06
- Assignees: Ciba Specialty Chemicals Corporation
- Inventors: Dieter Reinehr; Hanspeter Sauter; Hans Kramer; Werner Schreiber
- Web page: https://patentgrep.com/patent/US6719922B1

## CPC

- C07C 255/51: containing at least two cyano groups bound to the carbon skeleton
- C11D 3/42: Brightening agents {; Blueing agents}
- D06L 4/636: with disperse brighteners
- D06L 4/65: with mixtures of optical brighteners
- D06L 4/664: Preparations of optical brighteners; Optical brighteners in aerosol form; Physical treatment of optical brighteners
- Y10S 8/922: Polyester fiber
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C11D: DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- D06L: DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

The present invention relates to a mixture of fluorescent whitening agents comprising 20 to 70% by weight of a compound of formula (1), 30 to 80% of a compound of formula (2) and 0.5 to 5% of a compound of formula (3), compositions containing the mixture and the use of the compositions for whitening synthetic fibers, in particular polyester.

## Claims

### Claim 1

A mixture of fluorescent whitening agents comprising 55 to 70% by weight of a compound of formula
30 to 45% of a compound of formula
0.5 to 3% of a compound of formula

### Claim 2 (depends on 1)

A mixture according to claim 1 comprising 58 to 62% by weight of the compound of formula (1), 38 to 42% of the compound of formula (2) and 0.5 to 3% of the compound of formula (3).

### Claim 3 (depends on 1)

A composition for whitening synthetic fibres, which contains water, a mixture of fluorescent whitening agents according to claim 1 and, optionally, auxiliaries.

### Claim 4 (depends on 3)

A composition for whitening synthetic fibres according to claim 3 containing water and, in each case based on the weight of the formulation, from 3 to 25% by weight of the fluorescent whitening agent mixture and also 0 to 60% of auxiliaries.

### Claim 5 (depends on 3)

A composition for whitening synthetic fibres according to claim 3 containing water and, in each case based on the weight of the formulation, from 5 to 15% by weight of the fluorescent whitening agent mixture and also 5 to 50% of auxiliaries.

### Claim 6

A method of whitening synthetic fibres which comprises treating said fibres with a mixture of fluorescent whitening agents comprising 20 to 55% by weight of a compound of formula
30 to 45% of a compound of formula
0.5 to 3% of a compound of formula

### Claim 7 (depends on 6)

A method according to claim 6 wherein the synthetic fibres are polyester fibres.