The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 07, 1987
Filed:
Nov. 08, 1984
Josef Navratil, Basel, CH;
Heinz Abel, Reinach, CH;
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
The invention relates to a process for dyeing hydrophobic fibre material under HT conditions with unformulated disperse dyes from an aqueous liquor, which process comprises dissolving one or more such dyes in water, in the temperature range from 70.degree. to 100.degree. C., with a surfactant or mixture of surfactants which has a hydrotropic action on disperse dyes, feeding the dye solution into a dyeing apparatus which contains water heated to 70.degree. to 100.degree. C. and substrate, and subsequently heating the dye liquor to dyeing temperature, or dissolving the dye at a temperature of over 100.degree. C. under pressure by means of the surfactant or mixture of surfactants which has a hydrotropic action on the dye, feeding the solution into a closed dyeing apparatus which contains water heated to 100.degree. to 150.degree. C. and substrate, and, in both cases, carrying out dyeing in the temperature range from 120.degree. to 150.degree. C. with constant circulation of the dye liquor. The advantage of this process is that disperse dyes can be used direct for dyeing e.g. polyester without complicated grinding and formulation procedures.