US20070186358A1 - Concentrated optical brightener solutions - Google Patents

Concentrated optical brightener solutions Download PDF

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Publication number
US20070186358A1
US20070186358A1 US10/591,572 US59157205A US2007186358A1 US 20070186358 A1 US20070186358 A1 US 20070186358A1 US 59157205 A US59157205 A US 59157205A US 2007186358 A1 US2007186358 A1 US 2007186358A1
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United States
Prior art keywords
formula
storage
aqueous solution
optical brightener
amine
Prior art date
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Abandoned
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US10/591,572
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English (en)
Inventor
Andrew Jackson
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Clariant Finance BVI Ltd
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Clariant Finance BVI Ltd
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Assigned to CLARIANT FINANCE (BVI) LIMITED reassignment CLARIANT FINANCE (BVI) LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JACKSON, ANDREW CLIVE
Publication of US20070186358A1 publication Critical patent/US20070186358A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
    • C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
    • C07D401/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a chain containing hetero atoms as chain links
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
    • C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
    • C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
    • C07D251/26—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with only hetero atoms directly attached to ring carbon atoms
    • C07D251/40—Nitrogen atoms
    • C07D251/54—Three nitrogen atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
    • C07D403/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings
    • C07D403/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings linked by a chain containing hetero atoms as chain links
    • 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
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments

Definitions

  • the instant invention relates to concentrated aqueous solutions of hexasulphonated stilbene optical brighteners which are storage-stable in the absence of solubilizing agents like urea.
  • Hexasulphonated stilbene optical brightening agents are a well-established means of producing coated papers with a high degree of whiteness. Such optical brighteners are most conveniently marketed and used in the form of aqueous solutions.
  • Japanese Kokai 62-106965 discloses an optical brightener, or a salt thereof, in which R 1 and R 2 each independently represents a group selected from and A represents a group selected from a hydrogen atom, an alkyl group having from 1 to 4 carbon atoms, which may have a side chain, a hydroxymethyl group, a hydroxyethyl group, a methylthioethyl group, a benzyl group, a carboxymethyl group and a carboxyethyl group.
  • said optical brighteners have a very high solubility in water and can be commercialized in the form of a thick solution after removing the sodium chloride produced in the reaction and concentrating the water content by an appropriate method.
  • the optical brighteners are claimed to be very effective for the whitening of paper in a surface treatment.
  • Each example of the Kokai describes the preparation of an optical brightener which is desalinated by ultrafiltration to give a thick solution. Supposing that in Example 1 the reaction of the starting compounds gives a 100% yield of said optical brightener then the maximal concentration in said thick solution would be 0.214 mol/kg (30-32%). Each solution is then rendered storage-stable by the addition of 10% urea.
  • concentration of the aqueous solution is of particular significance when the brightener is applied in a pigmented coating composition; it is well-known that papermakers aim to minimise the water-content of the coating composition in order to minimise drying energy and to minimise water and binder migration into the base paper. (See, for example, ‘The Essential Guide to Aqueous Coating of Paper and Board’, ed. T. W. R. Dean, PITA, 1997.)
  • An object of the present invention therefore is a storage-stable aqueous solution comprising an optical brightener of formula (1) wherein
  • the aqueous solutions of the optical brightener(s) may optionally contain one or more carriers, antifreezes, preservatives, complexing agents etc., as well as organic by-products formed during the preparation of the optical brightener.
  • Carriers are known to give improved whitening characteristics and may be, e.g., polyethylene glycols, polyvinyl alcohols or carboxymethylcelluloses.
  • Antifreezes may be, e.g., urea, diethylene glycol or triethylene glycol.
  • the compounds of formula (1) are prepared by stepwise reaction of a cyanuric halide with
  • cyanuric halide there may be employed the bromide or, preferably, the chloride.
  • Each reaction may be carried out in an aqueous medium, the cyanuric halide being suspended in water, or in an aqueous/organic medium, the cyanuric halide being dissolved in a solvent such as acetone.
  • Each amine may be introduced without dilution, or in the form of an aqueous solution or suspension.
  • the amines can be reacted in any order, although it is preferred to react the aromatic amines first.
  • Each amine may be reacted stoichiometrically, or in excess.
  • the aromatic amines are reacted stoichimetrically, or in slight excess; the aliphatic amines are generally employed in an excess of 5-30% over stoichiometry.
  • substitution of the first halogen of the cyanuric halide it is preferred to operate at a temperature in the range of 0 to 20° C., and under acidic to neutral pH conditions, preferably in the pH range of 2 to 7.
  • substitution of the second halogen of the cyanuric halide it is preferred to operate at a temperature in the range of 20 to 60° C., and under weakly acidic to weakly alkaline conditions, preferably at a pH in the range of 4 to 8.
  • substitution of the third halogen of the cyanuric halide it is preferred to operate at a temperature in the range of 60 to 102° C., and under weakly acidic to alkaline conditions, preferably at a pH in the range of 7 to 10.
  • the pH may be controlled by addition of suitable acids or bases as necessary, preferred acids being e.g., hydrochloric acid, sulphuric acid, formic acid or acetic acid, preferred bases being e.g., alkali metal (e.g., lithium, sodium or potassium) hydroxides, carbonates or bicarbonates, or aliphatic tertiary amines e.g. triethanolamine or triisopropanolamine.
  • suitable acids or bases as necessary, preferred acids being e.g., hydrochloric acid, sulphuric acid, formic acid or acetic acid, preferred bases being e.g., alkali metal (e.g., lithium, sodium or potassium) hydroxides, carbonates or bicarbonates, or aliphatic tertiary amines e.g. triethanolamine or triisopropanolamine.
  • a further object of the instant invention is the process for the preparation of said aqueous solutions wherein the compounds of formula (1) are prepared as described above and wherein the alkali metal or amine salt that is generated as a by-product of each reaction between an amine and a cyanuric halide is removed from the reaction solution.
  • a stable aqueous solution with a concentration of higher than 0.214 mol/kg (32-33% by weight), preferably from 0.214 to 0.350 mol/kg, more particularly from 0.250 to 0.340 mol/kg, of a compound of formula (1) without the addition of solubilizing aids such as ethylene glycol, urea or a mono-, di- or tri-(2-hydroxyethyl)- or (2-hydroxypropyl)-amine it is necessary to remove at least 50%, preferably at least 80 % by weight, of the alkali metal or amine salt that is generated as a by-product of each reaction between an amine and a cyanuric halide. This is preferably done by ultrafiltration or membrane filtration of the solution formed as described above.
  • the compound of formula (1) can be isolated by precipitation (e.g. by the addition of acid) then redissolved.
  • a further object of the instant invention is the use of the instant storage-stable aqueous solutions for brightening of paper or other cellulosic substrates.
  • the concentrated solutions of compounds of formula (1) are particularly suitable for the brightening of paper after sheet formation. This may be effected by adding the optical brightener solution to a pigmented coating composition, or to a sizing solution or suspension.
  • the concentrated solutions of compounds of formula (1) are applied to the surface of paper in a pigmented coating composition.
  • the coating compositions are essentially aqueous compositions that contain at least one binder and a white pigment, in particular an opacifying white pigment, and may additionally contain further additives such as dispersing agents and defoamers.
  • white pigments are generally inorganic pigments, e.g., aluminium silicates (kaolin, otherwise known as china clay), calcium carbonate (chalk), titanium dioxide, aluminium hydroxide, barium carbonate, barium sulphate, or calcium sulphate (gypsum).
  • aluminium silicates kaolin, otherwise known as china clay
  • calcium carbonate chalk
  • titanium dioxide aluminium hydroxide
  • barium carbonate barium carbonate
  • barium sulphate calcium sulphate
  • the binders may be any of those commonly used in the paper industry for the production of coating compositions and may consist of a single binder or of a mixture of primary and secondary binders.
  • the sole or primary binder is preferably a synthetic latex, typically a styrene-butadiene, vinyl acetate, styrene acrylic, vinyl acrylic or ethylene vinyl acetate polymer.
  • the secondary binder may be, e.g., starch, carboxymethylcellulose, casein, soy polymers, or polyvinyl alcohol.
  • the sole or primary binder is used in an amount typically in the range 5-25% by weight of white pigment.
  • the secondary binder is used in an amount typically in the range 0.1-2% by weight of white pigment; starch however is typically used in the range 5-10% by weight of white pigment.
  • the optical brightener of formula (1) is used in an amount typically in the range 0.01-1% by weight of white pigment, preferably in the range 0.05-0.5% by Weight of white pigment.
  • Parts means, if not defined differently, “parts by weight”.
  • a solution of 21.3 parts aniline-2,5-disulphonic acid and 6.7 parts sodium hydroxide in 30 parts water is added to a stirred suspension of 15.5 parts cyanuric chloride in 50 parts ice water.
  • the pH is kept at 6 by the dropwise addition of 30% sodium hydroxide.
  • the mixture is stirred below 10° C. until primary aromatic amine groups can no longer be detected by the diazo reaction.
  • a solution of 14.8 parts 4,4′-diaminostilbene-2,2′-disulphonic acid and 3.2 parts sodium hydroxide in 20 parts water is then added, the pH is adjusted to between 6.5 and 7.5 by the addition of 30% sodium hydroxide and the mixture is stirred at 30° C. until a negative diazo reaction is obtained.
  • a solution of 12.2 parts L-aspartic acid in 22.9 parts 16% sodium hydoxide is added, and the mixture is heated at reflux for 6 hours, the pH being kept at 7.5 to 8.5 by the addition of 30% sodium hydroxide.
  • the aqueous solution so-formed of (2) in the form of its sodium salt, which is approximately 0.167 mol/kg in concentration, is desalinated by membrane filtration and concentrated to 0.330 mol/kg (50% by weight).
  • the resulting solution, 2.0% in sodium chloride has a viscosity of 0.23-0.25 Pa.s at 20° C. and shows no signs of precipitation after 2 weeks at 5° C.
  • An aqueous solution of (3) in the form of its sodium salt at a concentration of 0.330 mol/kg (51% by weight) is prepared as described in Example 1 but using 13.5 parts L-glutamic acid in place of 12.2 parts L-aspartic acid.
  • the resulting solution, 2.0% in sodium chloride, has a viscosity of 0.23-0.25 Pa.s at 20° C. and shows no signs of precipitation after 2 weeks at 5° C.
  • a coating composition is prepared containing 500 parts chalk (commercially available under the trade name Hydrocarb 90 from OMYA), 500 parts clay (commercially available under the trade name Kaolin SPS from IMERYS), 470 parts water, 6 parts dispersing agent (a sodium salt of a polyacrylic acid commercially available under the trade name Polysalz S from BASF), 200 parts latex (an acrylic ester copolymer commercially available under the trade name Acronal S320D from BASF) and 30 parts of a 10% solution of carboxymethyl cellulose (commercially available under the trade name Finnfix 5.0 from Noviant) in water.
  • the solids content is adjusted to 65% by the addition of water, and the pH is adjusted to 8-9 with sodium hydroxide.
  • the brightened coating composition is then applied to a commercial 75 gsm neutral-sized white paper base sheet using an automatic wire-wound bar applicator with a standard speed setting and a standard load on the bar.
  • the coated paper is then dried for 5 minutes in a hot air flow.
  • the dried paper is allowed to condition, then measured for CIE Whiteness on a calibrated Elrepho spectrophotometer. TABLE 1 CIE Whiteness using OBA Concentration (%)
  • Brightener of Example 1 0 92.0 0.1 97.9 0.2 102.6 0.3 106.2 0.4 108.4 0.5 110.3 0.6 112.2

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Paper (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)
  • Coloring (AREA)
US10/591,572 2004-03-05 2005-02-17 Concentrated optical brightener solutions Abandoned US20070186358A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP04005210A EP1571149A1 (en) 2004-03-05 2004-03-05 Optical brightener solutions
EP04005210.2 2004-03-05
PCT/IB2005/000407 WO2005092868A1 (en) 2004-03-05 2005-02-17 Concentrated optical brightener solutions

Publications (1)

Publication Number Publication Date
US20070186358A1 true US20070186358A1 (en) 2007-08-16

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ID=34746007

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/591,572 Abandoned US20070186358A1 (en) 2004-03-05 2005-02-17 Concentrated optical brightener solutions

Country Status (14)

Country Link
US (1) US20070186358A1 (ko)
EP (2) EP1571149A1 (ko)
JP (1) JP2007526383A (ko)
KR (1) KR20070008584A (ko)
CN (1) CN1926120A (ko)
AU (1) AU2005225623A1 (ko)
BR (1) BRPI0508459A (ko)
CA (1) CA2553556A1 (ko)
NO (1) NO20063924L (ko)
PE (1) PE20060182A1 (ko)
RU (1) RU2380364C2 (ko)
TW (1) TW200602534A (ko)
WO (1) WO2005092868A1 (ko)
ZA (1) ZA200606681B (ko)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090081475A1 (en) * 2005-04-08 2009-03-26 Andrew Clive Jackson Aqueous Solutions of Optical Brighteners
USRE46913E1 (en) 2008-03-26 2018-06-26 Archroma Ip Gmbh Optical brightening compositions

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* Cited by examiner, † Cited by third party
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US8758886B2 (en) 2005-10-14 2014-06-24 International Paper Company Recording sheet with improved image dry time
AU2014259497B2 (en) * 2008-03-26 2016-05-12 Archroma Ip Gmbh Improved optical brightening compositions
RU2495973C2 (ru) * 2008-03-26 2013-10-20 Клариант Финанс (Бви) Лимитед Усовершенствованные композиции для оптического отбеливания
EP2559809B1 (en) 2008-03-31 2015-10-14 International Paper Company Recording sheet with enhanced print quality at low additive levels
US20100129553A1 (en) * 2008-11-27 2010-05-27 International Paper Company Optical Brightening Compositions For High Quality Inkjet Printing
PT2192230E (pt) * 2008-11-27 2012-10-09 Clariant Finance Bvi Ltd Composições de branqueamento óptico para impressão a jacto de tinta de alta qualidade
US8574690B2 (en) 2009-12-17 2013-11-05 International Paper Company Printable substrates with improved dry time and acceptable print density by using monovalent salts
US8652593B2 (en) 2009-12-17 2014-02-18 International Paper Company Printable substrates with improved brightness from OBAs in presence of multivalent metal salts
TWI506183B (zh) * 2010-02-11 2015-11-01 Clariant Finance Bvi Ltd 於施漿壓印應用中用於調色光之水性上漿組成物
US8608908B2 (en) 2010-04-02 2013-12-17 International Paper Company Method and system using low fatty acid starches in paper sizing composition to inhibit deposition of multivalent fatty acid salts
US8440053B2 (en) 2010-04-02 2013-05-14 International Paper Company Method and system using surfactants in paper sizing composition to inhibit deposition of multivalent fatty acid salts
WO2011139481A1 (en) 2010-05-04 2011-11-10 International Paper Company Coated printed substrates resistant to acidic highlighters and printing solutions
CN103003492B (zh) 2010-07-23 2015-04-08 国际纸业公司 以较低油墨用量提供较高印刷质量和分辨率的涂布可印刷基底
WO2012067976A1 (en) 2010-11-16 2012-05-24 International Paper Company Paper sizing composition with salt of calcium (ii) and organic acid products made thereby,method of using, and method of making
ES2566109T3 (es) * 2013-03-21 2016-04-11 Archroma Ip Gmbh Agentes abrillantadores ópticos para impresión por chorro de tinta de alta calidad
CN110424182A (zh) * 2019-07-08 2019-11-08 浙江金龙纸业有限公司 一种环境友好型复配表面施胶剂及其制备方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6911116B2 (en) * 1999-12-22 2005-06-28 Clariant Finance (Bvi) Limited Cationically modified white pigments, their production and use

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62106965A (ja) * 1985-11-05 1987-05-18 Shin Nisso Kako Co Ltd 螢光増白剤
JP2001518919A (ja) * 1997-03-25 2001-10-16 チバ スペシャルティ ケミカルズ ホールディング インコーポレーテッド 蛍光増白剤
GB0127903D0 (en) * 2001-11-21 2002-01-16 Clariant Int Ltd Improvements relating to organic compounds

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6911116B2 (en) * 1999-12-22 2005-06-28 Clariant Finance (Bvi) Limited Cationically modified white pigments, their production and use

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090081475A1 (en) * 2005-04-08 2009-03-26 Andrew Clive Jackson Aqueous Solutions of Optical Brighteners
US8859679B2 (en) * 2005-04-08 2014-10-14 Clariant Finance (Bvi) Limited Aqueous solutions of optical brighteners
US20140374042A1 (en) * 2005-04-08 2014-12-25 Clariant Finance (Bvi) Limited Aqueous solutions of optical brighteners
USRE46913E1 (en) 2008-03-26 2018-06-26 Archroma Ip Gmbh Optical brightening compositions

Also Published As

Publication number Publication date
AU2005225623A1 (en) 2005-10-06
PE20060182A1 (es) 2006-03-15
CN1926120A (zh) 2007-03-07
BRPI0508459A (pt) 2007-07-31
CA2553556A1 (en) 2005-10-06
TW200602534A (en) 2006-01-16
RU2006131669A (ru) 2008-03-10
JP2007526383A (ja) 2007-09-13
NO20063924L (no) 2006-10-05
WO2005092868A1 (en) 2005-10-06
ZA200606681B (en) 2008-02-27
EP1735290A1 (en) 2006-12-27
KR20070008584A (ko) 2007-01-17
RU2380364C2 (ru) 2010-01-27
EP1571149A1 (en) 2005-09-07

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Legal Events

Date Code Title Description
AS Assignment

Owner name: CLARIANT FINANCE (BVI) LIMITED, VIRGIN ISLANDS, BR

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:JACKSON, ANDREW CLIVE;REEL/FRAME:018304/0182

Effective date: 20060619

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION