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US 4,031,273 AGranted
Continuous process for optical brightening
AssigneeCiba-Geigy Corporation
InventorsGerhard Reinert, Jack Fallows, Paul Dussy
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Abstract
Process for the continuous optical brightening of synthetic polyamide fibre material from organic solvents, wherein A. the fibre material is dry cleaned, B. at least one ionic optical brightener is applied to the material from a solution, emulsion or dispersion in a non-polar organic solvent, C. the material is intermediately dried, D. the optical brightener is developed in a hot aqueous acid bath, and E. the fibre material is subsequently thermofixed.
Claims14
Process for the continuous optical brightening of synthetic polyamide fiber material from organic solvents, wherein
- a. the fiber material is dry cleaned,
- b. at least one ionic optical brightener is applied to the material from a solution, emulsion or dispersion in a non-polar organic solvent,
- c. the material is dried,
- d. the optical brightener is treated with hot aqueous acid, and
- e. the fiber material is subsequently heat-treated.
2 more elements
Dependencies are inferred from the claim text.