Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
  • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
  • D21H21/28—Colorants ; Pigments or opacifying agents
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S8/00—Bleaching and dyeing; fluid treatment and chemical modification of textiles and fibers
  • Y10S8/916—Natural fiber dyeing
  • Y10S8/919—Paper

Definitions

• Alkylene is in particular a radical having 1 to 3 carbon atoms.
• Acylamino is preferably understood to mean C 1 to C 3 alkylcarbonylamino, C 1 to C 3 alkylsulfonylamino, aminocarbonylamino or benzoylamino, optionally substituted by halogen or an ammonium group, but especially acetylamino, propionylamino or aminocarbonyl.
• Halogen is preferably chlorine or bromine.
• Anions An (-) are the colorless organic and inorganic anions customary for cationic dyes, for example chloride, bromide, iodide, hydroxide, hydrogen sulfate, sulfate, nitrate, dihydrogen phosphate, phosphate, carbonate, perchlorate, fluoroborate, chlorozincate, methosulfate, ethosulfate, acetate, Propionate, lactate, citrate, benzenesulfonate and toluenesulfonate.
• cationic dyes for example chloride, bromide, iodide, hydroxide, hydrogen sulfate, sulfate, nitrate, dihydrogen phosphate, phosphate, carbonate, perchlorate, fluoroborate, chlorozincate, methosulfate, ethosulfate, acetate, Propionate, lactate, citrate, benzenesulfonate and toluen
• the anion is generally given by the manufacturing process.
• the dyes are preferably present as chlorides, hydrogen sulfates, sulfates, methosulfates, phosphates, acetates, lactates, citrates.
• the anions can be exchanged for other anions in a known manner and can be present as mixtures.
• the dyes (I) are used for dyeing paper either as dye-powder preparations or preferably in the form of concentrated dye solutions.
• Powder preparations are made in the usual way with coupé agents such as sodium sulfate, phosphates, chloride, acetate or are marketed as spray drying brands.
• the concentrated dye solutions can be aqueous or aqueous / organic, preference being given to conventional, environmentally friendly and readily degradable organic additives, such as organic acids such as acetic acid, formic acid, amides such as formamide, dimethylformamide, urea, alcohols such as glycol, diglycol, diglycol ether, especially its methyl or ethyl ether.
• the concentrated dye solutions are prepared in a customary manner, for example by dissolving the dye (as a paste or powder) in a suitable solvent or solvent mixture.
• the dye powders or solutions are generally used, after dilution with water, for the continuous or discontinuous dyeing of paper.
• the dyes are used for coloring paper pulp or for coloring paper surfaces. They are suitable for sized and unsized paper types based on bleached or unbleached pulp of different origins such as softwood or hardwood sulfite and / or sulfate pulp.
• the dyeing is preferably carried out at pH values from 4 to 8, in particular pH 5 to 7.
• the dyeing temperature is generally 10 ° to 50 ° C., preferably about 20 ° C. (room temperature).
• auxiliaries and fillers customary in paper dyeing and production can also be used when using the dyes according to the invention.
• the dyes have excellent drawability when coloring paper.
• the paper dyeings obtained with the dyes according to the invention are distinguished by very good fastness to water (fastness to bleeding) and fastness to acid, alkali and alum.
• the dyes of the formula (I) are known, for example from US-PS 602 637, DE-PS 93 499, DE-PS 95 530 and DE-AS 1 005 486 and have hitherto been used for dyeing tannic cotton, half-wool and polyacrylonitrile. It is therefore surprising that, in the case of paper dyeing, they produce almost colorless waste water even without auxiliaries and the dyeings obtained have good wet fastness properties.
• the dyes of the formula (I) are prepared by, in a known manner, aminoazo compounds of the formula wherein X (+) m, R 1 , R 2 , R 3 and An (-) have the meaning given in formula (I), diazotized and with compounds of the formula wherein R and ring a have the meaning given in formula (I) couples.
• a desiccant consisting of 60% wood pulp and 40% unbleached sulfite pulp is beaten with water in the Dutch and ground to a degree of grinding of 40 ° - SR so that the dryness is a little over 2.5%, and then with water to exactly 2.5% Dry matter content of the thick matter adjusted.

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• Paper (AREA)
• Coloring (AREA)

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Citations (2)

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• 1981
  • 1981-03-17 DE DE19813110223 patent/DE3110223A1/de not_active Withdrawn
• 1982
  • 1982-02-26 US US06/352,722 patent/US4411669A/en not_active Expired - Lifetime
  • 1982-03-06 EP EP82101762A patent/EP0060468B1/fr not_active Expired
  • 1982-03-06 DE DE8282101762T patent/DE3260864D1/de not_active Expired

Patent Citations (2)

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