Process for the continuous optical brightening of organic fibre material
Abstract
Abstract A PROCESS FOR THE CONTINUOUS, NON-AQUEOUS OPTICAL BRIGHTENING OF ORGANIC FIBRE MATERIAL, ESPECIALLY FIBRE MATERIAL MADE FROM NATURAL OR SYNTHETIC POLYAMIDE, IS DISCLOSED, WHICH COMPRISES IMPREGNATING SAID FIBRE MATERIAL WITH THE SOLUTION OF AT LEAST ONE OPTICAL BRIGHTENER SALT CONSISTING OF AN ANIONIC RADICAL OF AN ANIONIC OPTICAL BRIGHTENER AND AT LEAST ONE ORGANIC NITROGEN COMPOUND CONTAINING AT LEAST ONE NITROGEN ATOM CAPABLE OF SALT FORMATION, IN A SOLVENT OR SOLVENT MIXTURE, THE SOLVENT OR SOLVENT MIXTURE CONSISTING OF UNSUBSTITUTED OR HALOGENATED HYDROCARBON BOILING BETWEEN 50 AND 150*C., AND, OPTIONALLY LIQUID, WATER-SOLUBLE ORGANIC SOLVENT BOILING BELOW 220*C., REMOVING EXCESS SOLVENT FROM THE MATERIAL AND FINISHING THE BRIGHTENING BY A HEAT TREATMENT OF THE IMPREGNATED FIBRE MATERIAL AT TEMPERATURES BELOW THE SOFTENING POINT OF SAID FIBRE MATEIAL. BY THIS PROCESS, ON THE STATED FIBRE MATERIAL VERY EFFECTIVE AND EVEN OPTICAL BRIGHTENINGS HAVING GOOD FASTNESS PROPERTIES, SUCH AS FASTNESS TO DRY CLEANING AND WASHING, ARE OBTAINED.
Inventors
- 👤 Hans Wegmuller
- 👤 Alois Kleemann
- 👤 Rudolf Keller
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |