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
  • D21H21/30—Luminescent or fluorescent substances, e.g. for optical bleaching
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
  • D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
  • D06L4/60—Optical bleaching or brightening
  • D06L4/664—Preparations of optical brighteners; Optical brighteners in aerosol form; Physical treatment of optical brighteners

Definitions

• the invention relates to a preparation of optical brighteners for whitening coatings, characterized by the solution of whites in a single-phase system containing water, organic liquids boiling above 150 ° C. which are not completely miscible with water, and a solubilizer.
• the invention further relates to a method for whitening coatings, characterized in that the coating compositions solutions of whites in the above. single-phase system can be added.
• Coatings for the production of smooth surfaces, such as paper or cardboard contain binders of various chemical compositions. These coatings are lightened with white tones to improve their aspect.
• binders such as casein, starch, protein or gelatin
• anionic whiteners from the triazinylflavonic acid series This class of substances fails in the case of artificial binders. If whiteners of the TriazinylflavonsQure series are used in the presence of surfactants (GB-PS 1 294 173) or amide-formaldehyde resins (DT-OS 2 229 872), brightenings are obtained, but their whiteness does not meet the requirements.
• the whiteness level is not significantly improved even if, instead of the water-soluble triazinylflavonic acid derivatives, dispersion whitening agents are used and a lightening from the dispersion is attempted. Moreover, these proposals are limited to synthetic latices as the only binders and cannot be used for the technically important mixtures of natural and synthetic binders.
• DT-OS 2 242 597 Another proposal (DT-OS 2 242 597) is to dissolve dispersion whitening agents in a colorless organic liquid which is immiscible with water, whose boiling point is above 150 ° C and in which the whitening agent has a minimum solubility of 0 at room temperature , 3 g / 1, and add these solutions, which may also contain an emulsifier, to the coating slips. Although good white effects are obtained with this method, no homogeneous mixture occurs between the aqueous latex and the white toner solution, so that the use of the process leads to uneven brightening.
• a further, previously unknown, advantageous property of this preparation is that the system according to the invention is able to absorb anionic brighteners in addition to dispersion whitening agents.
• Organic liquids boiling above 150 ° C. and not completely miscible with water are, for example, high-boiling ethers such as dibenzyl ether, diphenyl ether and 1-methoxymethylnaphthalene; Acetals such as diphenoxyethyl formal; chlorinated hydrocarbons such as chlorinated paraffins with a chlorine content of 10 to 80, preferably 40 to 50%; Alkylbenzenes such as dodecylbenzene; Esters of organic and inorganic acids, for example phosphoric acid esters such as diphenyloctyl phosphate, chloroethyl phosphate and trioctyl phosphate; Monocarboxylic acid esters such as methyl oleic acid; Oxicarboxylic acid esters such as acetyl (2-ethylhexyl) citrate, acetyl tri-n-butyl citrate, castor oil, salicylic acid or methyl cresotate, aryl al
• Phosphoric acid esters such as triethyl phosphate, trioctyl phosphate, tricresyl phosphate and trichloroethyl phosphate have proven particularly useful.
• Non-ionic and anionic emulsifiers can be used as solubilizers.
• the former emulsifiers are: esters and ethers of polyalcohols such as alkyl polyglycol ethers, e.g.
• acyl polyglycol ether such as oleic acid polyglycol ether
• alkylaryl polyglycol ether such as the ethoxylation products of nonyl and dodecylphenol
• acylated amino-alkanol polyglycol ether furthermore non-ionogenic surfactants such as fatty amines or derivatives of fatty amines, which are derived from fatty amine derivatives of fatty amines, such as fatty amines, derived from fatty amine derivatives such as fatty amines, derived from fatty amine derivatives such as fatty amines, derived from fatty amines, derived from fatty amines.
• the system can additionally contain solubility-improving substances such as caprolactam, dimethylformamide, N-methylpyrrolidone or associates from caprolactam on the one hand and alcohols and amines such as methanol, ethanol, ethyl-ethylene glycol, aminoethanol, diethylene diamine or triethylene glycol on the other hand. These substances can also take on the role of non-ionic solubilizers.
• the preparation according to the invention and the method according to the invention are suitable for whitening the coating slips usually used in the paper industry, specifically for whitening unpigmented, but in particular pigmented coating slips.
• These known coating slips contain, as binders, plastic dispersions based on copolymers of butadiene-styrene, acrylonitrile-butadiene-styrene, acrylic acid esters, ethylene-vinyl chloride and ethylene-vinyl acetate; Homopolymers, such as polyvinyl chloride, polyvinylidene chloride, polyethylene and polyvinyl acetate; or polyurethanes.
• Aluminum silicates such as china clay and kaolin, barium sulfate, satin white, titanium dioxide or calcium carbonate (chalk) are usually used to pigment the coating slips.
• the preparation of the preparation according to the invention is simple. It is done by mixing the components in any order at temperatures between 10 and 150 ° C. A preferred embodiment is to convert the components into a homogeneous phase at 80 to 120 ° C. After cooling, the ready-to-use product is obtained. If the anionic brightener is used as color acid, it is advantageous to concentrate it in the formation by adding neutralizing agents, preferably conc. To completely or partially neutralize NaOH.
• the quantitative composition of the preparations according to the invention can be varied widely.
• additives such as e.g. dispense with the water-soluble organic compound or the anionic solubilizer.
• Preparations of this type contain 5 to 30, preferably 10 to 20% by weight of water, 0.1 to 10, preferably 1 to 5% by weight of white clay, 10 to 55, preferably 30 to 40% by weight, organic liquid and 20 up to 80 wt .-%, preferably 35 to 55 wt .-% solubilizers.
• Such preparations contain 5 to 25 preferably 8-15% by weight of water, 0.5 to 5, preferably 1 to 3% by weight of dispersion white toner, 1 to 30, preferably 5 to 15% by weight of white toner containing sulfonic acid groups, 4 to 20, preferably 5 to 15% by weight .-% organic liquid, 20 to 50 wt .-%, preferably 30 to 45 wt .-% non-ionic solubilizers and 3 to 15, preferably 5 to 10 wt .-% anionic solubilizers, and up to 40 , preferably 2 -10% by weight of water-miscible organic substances.
• the coating composition according to the invention can be used for coating paper, wood, foils, textiles, non-woven materials and suitable building materials. Use on paper and cardboard and photo paper is particularly preferred.
• the coating can be applied to the substrate by any conventional method and dried, for example with an air knife, doctor knife, brush, roller, squeegee or stick.
• the degree of whiteness that can be achieved can often be improved by drying at elevated temperatures.
• the coatings obtained in this way have an excellent level of white.
• This coating slip was applied to conventional coating base paper by means of a wire doctor and dried at 100 ° C.
• the degree of whiteness of the coated papers was determined with the aid of the Berger degree of whiteness formula on Elrepho with a xenon lamp from Carl Zeiss.
• the paper lightened according to the invention had a whiteness of 112.3 compared to 82.9 when using 5 g of the comparative brightener. Increased amounts of the comparison brightener lead to greening without any further increase in whiteness.
• the value given relates to the hydrophobic phase.
• Example 1 When incorporated as in Example 1, an excellent brightening of 115.3 Berger degrees of whiteness is obtained.
• This coating slip was applied to conventional coating base paper by means of a wire doctor and dried at 1000C.
• the degree of whiteness of the coated papers was determined with the aid of the Berger degree of whiteness formula on Elrepho with a xenon lamp from Carl Zeiss.
• the paper lightened according to the invention had a degree of whiteness of 108 Berger degrees of whiteness, while the comparative test only provides 99.6 Berger degrees of whiteness.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Paper (AREA)
• Paints Or Removers (AREA)

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Publications (2)

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Citations (2)

• 1979
  • 1979-02-02 DE DE7979100300T patent/DE2962980D1/de not_active Expired
  • 1979-02-02 EP EP79100300A patent/EP0003568B1/fr not_active Expired
  • 1979-02-12 FI FI790457A patent/FI790457A/fi unknown
  • 1979-02-13 JP JP1443679A patent/JPS54117383A/ja active Pending
  • 1979-02-13 ES ES477658A patent/ES477658A1/es not_active Expired
  • 1979-02-13 BR BR7900871A patent/BR7900871A/pt unknown

Patent Citations (2)

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