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
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
  • C09B67/00—Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
  • C09B67/0071—Process features in the making of dyestuff preparations; Dehydrating agents; Dispersing agents; Dustfree compositions
  • C09B67/0072—Preparations with anionic dyes or reactive dyes
  • C09B67/0073—Preparations of acid or reactive dyes in liquid form
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
  • C09B67/00—Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
  • C09B67/0071—Process features in the making of dyestuff preparations; Dehydrating agents; Dispersing agents; Dustfree compositions
  • C09B67/0075—Preparations with cationic dyes
  • C09B67/0076—Preparations of cationic or basic dyes in liquid form
• • 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
  • D21H3/00—Paper or cardboard prepared by adding substances to the pulp or to the formed web on the paper-making machine and by applying substances to finished paper or cardboard (on the paper-making machine), also when the intention is to impregnate at least a part of the paper body
  • D21H3/82—Paper or cardboard prepared by adding substances to the pulp or to the formed web on the paper-making machine and by applying substances to finished paper or cardboard (on the paper-making machine), also when the intention is to impregnate at least a part of the paper body by adding insoluble coloured substances, e.g. powders, fibres, pieces of metal, for obtaining different colours in the paper fancy papers; substances characterised by their physical appearance, e.g. form, rather than by their chemical constitution

Definitions

• the instant invention relates to storage stable, concentrated aqueous solutions of direct dyes, both anionic dyes and cationic or basic dyes, a process for their preparation and the use thereof for dyeing paper.
• benzyl alcohol would appear to be the additive of choice for the preparation of storage stable aqueous formulations of anionic dyes, one clear disadvantage is the undesirable odor of benzyl alcohol, even if utilized in relatively small quantities.
• the invention relates to an aqueous dye solution comprising a) 5 to 30%, preferably 10 to 25%, by weight of an anionic or cationic direct dye, b) 0.1 to 10%, preferably 0.5 to 5% and, most preferably, 0.5 to 3% by weight of 1- phenoxy-2-propanol, c) 0 to 20% by weight of an inorganic or an organic acid, d) 0 to 20% by weight of further additives and e) water to complete to 100%.
• these direct dyes are preferably selected from dyes containing at least one sulfonic acid and/or carboxylic acid group and are derived from the following dye classes: metal-free or metallic monoazo, disazo and polyazo dyes, pyrazolone, thioxanthone, oxazine, stilbene, formazan, anthraquinone, nitro, methine, triphenylmethane, xanthone, naphthazarine, styryl, azastyryl, naphthoperinone, quinophthalone, and phthalocyanine dyes.
• anionic direct dyes are listed in the Colour Index International, Fourth Edition Online (url: http:/www.colour-index.org) and may be selected from C.I. Direct Yellows 1-177, C.I. Direct Oranges 1-122, C.I. Direct Reds 1-277, C.I. Direct Violets 1-108 and C.I. Direct Blues 1-313.
• these cationic direct dyes are basic dyes.
• these so-called basic dyes are selected from the following classes: acridine, anthraquinone, azine, azomethine, azostyryl, mono-, bis- and polyazo, benzimidazole, benzothiazole, cyanine, di- and triaryl methane, ketone imine, methane and polymethine, naphthostyryl, nitro, oxazine and dioxazine, phthalocyanine, quinoline, quinophthalone, thiazine, thiazole and xanthene derivatives.
• Typical examples of cationic direct dyes are listed in the Colour Index International, Fourth Edition Online (url: http:/www.colour-index.org) and may be selected from C.I. Basic Yellows 1-108, C.I. Basic Oranges 1-69, C.I. Basic Reds 1-118, C.I. Basic Violets 1-51 and C.I. Basic Blues 1-164.
• the invention is especially useful for solutions of specific dyes, such as C.I. Basic Yellow 99 and 106, C.I. Basic Red 111, C.I. Basic Blue 100 and 153, C.I. Direct Yellow 11 , 50 and 84, C.I. Direct Orange 29 and 102, C.I. Direct Red 23, 80, 81, 239, 254 and 262, C.I. Direct Violet 9, 35 and 51 and C.I. Direct Blue 75, 86, 87, 199, 290 and 301.
• composition of the invention contains an organic or inorganic acid
• those acids particularly suited may be selected from, for example, hydrochloric acid, sulphuric acid, phosphoric acid, formic acid, acetic acid, propionic acid, glycol ic acid, gluconic acid, methanesulphonic acid, citric acid, succinic acid, lactic acid, glutamic acid, adipic acid or mandelic acid. Any of these acids may be used alone or in an acid mixture, although formic acid is most preferred.
• an acid to the composition of the invention is optional, preferably the acid is present in an amount of between 1 and 20% by weight, most preferably between 1 and 5%, based on the total weight of the composition.
• the dye solutions according to the invention may, in addition, contain further additives as component d), such as water-soluble organic solubilizers, examples of which are urea, formamide, ⁇ -caprolactam, sugars, such as dextrine, maltose or lactose, carboxycelluloses, such as xanthan, dimethylformamide, 1,2-diaminopropane, 2-(4-aminophenyl)-6- methylbenzothiazole 7-sulphonic acid and salts thereof and polyhydric alcohols such as ethylene glycol or glycerol, ⁇ -caprolactam and 2-(4-aminophenyl)-6-methylbenzothiazole 7- sulphonic acid and salts thereof being preferred.
• Further additives which may be present in the solutions of the invention are, for example, hydrotropic agents, viscosity regulators, dispersing agents, microbicides, particularly fungicides, and pH adjusting agents.
• acids, bases or buffers which are conventional and are usually used for the pH adjustment of dye formulations, for example mineral acids, such as hydrochloric acid, sulphuric acid or phosphoric acid, low molecular weight aliphatic carboxylic acids, for example having from 1 to 6 carbon atoms, such as formic acid, acetic acid, lactic acid or citric acid, or bases, such as alkali metal hydroxides or carbonates, or also aliphatic low molecular weight amines, such as those which can be used for the corresponding salt formation of the above mentioned acid groups, for example, ammonia, diethanolamine, triethanolamine or N-methyldiethanolamine.
• buffers it is possible to employ, for example, mono- or disodium phosphate, sodium acetate or ammonium sulphate.
• the pH of the concentrated dye solutions can thus be adjusted as required, depending upon the particular dye in question.
• the pH of the solutions generally lies within the range of from 3 to 11, whereby, in the case of cationic dyes, a range of from 4 to 6 is preferred, whilst, in the case of anionic dyes, a pH value of between 6 and 8 is preferable.
• the aqueous solutions also contain known products as are usually employed for protection against the harmful effect of microorganisms, principally products which inhibit the growth of microorganisms or also microbicides, particularly fungicides. These may be employed in low concentrations, for example, in the range of from 0.01 to 1%, especially from 0.05 to 0.5%.
• additives to the composition of the invention is optional, preferably they are present in an amount of between 1 and 20% by weight, most preferably between 1 and 10%, based on the total weight of the composition.
• the solutions of the invention are preferably, essentially free from other solvents, in particular alcohols, other than 1-phenoxy-2-propanol.
• the invention relates to a process for the preparation of a dye solution, which process comprises stirring the dye with a mixture of water, 1-phenoxy-2-propanol and, if desired, components c) and d), as described above, at a temperature between room temperature and 9O 0 C, preferably between 30 and 6O 0 C and, if necessary, filtering.
• the dyes can be employed in the form of corresponding dry dyes, as occur in blended commercial forms, or, preferably, as moist or also dried filter cakes or also as solutions which have previously been subjected to purification by micro- or ultra filtration.
• the anionic dyes are present in the form of readily water-soluble salts.
• suitable salts are alkali metal salts such as lithium potassium or, especially, sodium salts or ammonium salts, mono-, di-, tri- or tetraCrC 4 alkyl ammonium salts or C 2 - C 4 hydroxyalkyl ammonium salts or mixtures thereof.
• the counter ion should be such as to ensure sufficient water solubility.
• Preferred salts in this case are, for example, halogenides, especially chlorides, sulphates, methosulphates and, in particular lower aliphatic carboxylates such as formates, acetates and lactates.
• the formulation of the invention is suitable for dyeing natural or synthetic materials, in particular cellulosic materials in any desirable shade.
• the formulations are suitable for dyeing paper and paperboard.
• the invention relates to the use of the solutions for the dyeing of paper, by treating the paper with a liquid composition as defined previously.
• the liquid preparation is used, optionally after dilution with water, for the dyeing of paper or paperboard, whereby these materials can be dyed, for example, in the pulp, by brushing or immersion or by applying to the paper surface by coating or spraying or for application in a continuous dyeing process, whereby the paper or paperboard which has been dyed with the liquid composition of the invention constitutes a still further aspect of the invention.
• Stable formulations are also obtained from salt-containing filter cakes of the dye, whereby the viscosity of the solutions increases slightly.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Organic Chemistry (AREA)
• Paper (AREA)
• Coloring (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

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• 2006
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