IMPROVENENTS IN OR RELATING TO ORGANIC COMPOUNDS

Liquid compositions of sulphur dyes in leuco (reduced) form, have a total inorganic sulphide contents </= 3 % by weight and a very low content of inorganic salts other than sulphides. They are obtained by reducing a sulphur dye in an alkaline medium to which no sulphide reducing agent has been ad...

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Bibliographic Details
Main Authors MESZAROS, LASZLO A, DOMINGO, MANUEL J
Format Patent
LanguageEnglish
Korean
Published 25.03.1994
Edition5
Subjects
ADHESIVES
CHEMISTRY
DYEING LEATHER, FURS, OR SOLID MACROMOLECULAR SUBSTANCES INANY FORM
DYEING OR PRINTING TEXTILES
DYES
FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
LAKES
LAUNDERING
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
MORDANTS
NATURAL RESINS
ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES
PAINTS
POLISHES
TEXTILES
TREATMENT OF TEXTILES OR THE LIKE
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Summary:Liquid compositions of sulphur dyes in leuco (reduced) form, have a total inorganic sulphide contents </= 3 % by weight and a very low content of inorganic salts other than sulphides. They are obtained by reducing a sulphur dye in an alkaline medium to which no sulphide reducing agent has been added, preferably employing a reducing sugar (e.g. glucose) as reducing agent. Optionally, prior to reduction, the sulphur dye may be oxidised (e.g. aerated) to eliminate sodium sulphide, treated with sodium sulphite to eliminate elemental sulphur, and washed to eliminate inorganic salts. The reduction may be effected under an inert atmosphere and in the presence of a solubilising agent e.g. diethylene glycol, The liquid compositions have improved stability, and show improved penetration and more moderate substantivity in the dyeing and printing of cellulosics (e.g. cotton) and cellulose-polyester blends.
Bibliography:Application Number: KR19880001508