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US 4,634,448 AGranted
Method for dyeing of natural leathers using reactive dyes
AssigneeNippon Kayaku Kabushiki Kaisha
InventorsSyohei Ajioka, Toshio Tanaka
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Abstract
Disclosed herein is a method for dyeing of natural leathers by using a reactive dyestuff having at least one S-triazinyl group to which a substituent group having a quaternary nitrogen atom is bonded via the quaternary nitrogen atom without using any acid-binder, any substance releasing the acid-binder or any inorganic electrolyte, thereby obtaining the dyed natural leathers excellent in light fastness, alkaline-sweat and wet fastness.
Claims3
A method for dyeing natural leather by an exhaustion of a reactive dyestuff represented by the formulae (III) to (VI):
- ##STR153## wherein Y represents a group ##STR154## Y.sup.1 and Y.sup.2 are a group ##STR155## or one of Y.sup.1 and Y.sup.2 is a group ##STR156## and the other represents a chlorine atom, a fluorine atom or a bromine atom;
- D represents a chromophore having at least one water-soluble group, and D is bonded to the triazinyl group via a group ##STR157## wherein R is a hydrogen atom or an alkyl (C.sub.1 .about.C.sub.3) group;
- A represents an unsubstituted or substituted amino group, an alkoxy (C.sub.1 .about.C.sub.4) group or a phenoxy group which does not react with the chromophore;
- and X represents a diamino residual group bonded to the triazinyl group via two amino groups.
1 more element
Dependencies are inferred from the claim text.