WO2007085337A1 - Process for producing optically brightened paper - Google Patents

Process for producing optically brightened paper Download PDF

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Publication number
WO2007085337A1
WO2007085337A1 PCT/EP2006/070148 EP2006070148W WO2007085337A1 WO 2007085337 A1 WO2007085337 A1 WO 2007085337A1 EP 2006070148 W EP2006070148 W EP 2006070148W WO 2007085337 A1 WO2007085337 A1 WO 2007085337A1
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WO
WIPO (PCT)
Prior art keywords
optically brightened
process according
fibres
paper
pulp
Prior art date
Application number
PCT/EP2006/070148
Other languages
French (fr)
Inventor
Achim Kohler
Original Assignee
Clariant International Ltd
Clariant Finance (Bvi) Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Clariant International Ltd, Clariant Finance (Bvi) Limited filed Critical Clariant International Ltd
Priority to BRPI0621286-7A priority Critical patent/BRPI0621286A2/en
Priority to CA002636234A priority patent/CA2636234A1/en
Priority to JP2008551681A priority patent/JP2009524747A/en
Priority to DE602006007388T priority patent/DE602006007388D1/en
Priority to AT06830803T priority patent/ATE434083T1/en
Priority to EP06830803A priority patent/EP1982017B1/en
Priority to AU2006336948A priority patent/AU2006336948A1/en
Priority to US12/223,267 priority patent/US20100230061A1/en
Publication of WO2007085337A1 publication Critical patent/WO2007085337A1/en
Priority to IL192985A priority patent/IL192985A0/en
Priority to NO20083311A priority patent/NO20083311L/en

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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
    • 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
    • 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
    • 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
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/12—Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/14—Polyalkenes, e.g. polystyrene polyethylene
    • 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
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/24—Polyesters
    • 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
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/26—Polyamides; Polyimides

Definitions

  • the present invention relates to a process for the production of optically brightened paper by treating the pulp suspension with an optically brightened filler composition.
  • a high degree of brightness is a desirable property of paper and cardboard articles.
  • the most important raw material of the papermaking industry is pulp, which naturally absorbs blue light and therefore is yellowish in color and imparts a dull appearance to the paper.
  • Optical brighteners are used in the papermaking industry to compensate for the absorption of blue light by absorbing UV-light with a maximum wavelength of 350- 380nm and converting it into visible blue light with a maximum wavelength of 440nm.
  • brighteners other than those of the triazinylaminostilbene type must be used; in particular, brighteners typically used for the optical brightening of textiles, such as those of the benzoxazole, naphthalimide, triazolylcoumarin or triazinylpyrene types.
  • Such brighteners are however typically much more expensive, and can only be applied with difficulty to either pulp or to the paper surface.
  • EP-A-801 700 overcomes some of these problems by describing the use of optically brightened polyacrylonitrile powder to prepare white coating slips for paper.
  • Preferred optical brighteners are those typically used to provide a high lightfastness on textiles, for example of the triazolylcoumarin or benzoxazole type. Papers prepared using such coating slips show excellent whitening effects with high lightfastness. There is no suggestion however that this approach could be used to prepare optically brightened papers by a more economic pulp application. The economic use of textile brighteners to prepare optically brightened papers is therefore a difficult problem to which a satisfactory solution has not yet been found.
  • an object of the instant invention is a process for optical brightening of paper wherein a filler composition comprising optically brightened plastic fibres is added to the pulp suspension.
  • Said fibres preferably can be made from polyester, polyethylene, polypropylene or polyamide. Most preferably the fibres are made from polyester.
  • the fibres have a fineness between 1 and 10 dtex and are cut to a length of between 0.1 and 1mm, preferably they have a fineness between 1 and 2 dtex and a length between 0.2 and 0.6mm.
  • polyester fibres The preparation of polyester fibres is well-known and is described, for example, in "Handbook of Fiber Chemistry” by Menachem Lewin published in 1998 by Marcel Dekker, page 18.
  • optically brightened polyester is equally well-known and is described, for example, in GB 835,898 and EP-A-1 379 585.
  • the fibres are preferably optically brightened with compounds of formulae (1 ) to (4)
  • R 1 to R 8 independently of one another are hydrogen, Ci-C 2 o-alRyl or groups of the formula -COORg, where R 9 is hydrogen, Ci-C 2 o-alkyl or phenyl, or R 1 to R 8 are a group of the formula -SO 2 Ri O , where Ri 0 is hydrogen, C r C 10 -alRyl or Ci-C 10 -hydroxyalkyl, and A is stilbene, naphthalene, phenylene, thiophenylene or biphenylene, or mixtures of said compounds.
  • More preferred optical brighteners are compounds of formula (1 ) where R-i to R 8 independently of one another are hydrogen or Ci-C 4 -alkyl, and A is stilbene, naphthalene, phenylene, thiophenylene or biphenylene.
  • optical brighteners are compounds of formula (1 ) where R 1 to R 8 independently of one another are hydrogen or methyl, and A is stilbene.
  • the optically brightened plastic fibre contains between 10 and 500 ppm optical brightener, preferably between 20 and 250 ppm.
  • the pulp may be any conventional pulp used to produce paper, for example stone groundwood pulp, thermomechanical pulp, chemithermomechanical pulp, semichemical pulp, sulphite pulp or kraft pulp, or a mixture of these.
  • the pulp suspension is treated with 2 to 60%, preferably 10 to 40% by weight, based on weight of dry pulp, of the instant filler composition.
  • the filler composition may be added to the pulp suspension either in dry form or, preferably, in the form of an aqueous dispersion. It may be useful to add a dispersing agent, particularly suitable dispersing agents being of the type described in EP-A-964 015. Finally, the paper is formed on a wire screen of a conventional paper machine, pressed and dried.
  • the present invention also provides an optically brightened paper produced according to the instant process and which comprises 2 to 60%, preferably 10 to 40% by weight, based on weight of dry pulp, of the filler composition of the instant invention.
  • the optically brightened paper may also contain other additives commonly employed in the papermaking industry.
  • additives include sizing agents (for example, rosin, starch, alkyl ketene dimer, alkenyl succinic anhydride), wet strength resins (for example, poly-aminoamide-epichlorohydrin resins), retention- and drainage aids (for example, poly-aluminium chloride, polydiallyldimethylammonium chloride), and shading dyes.
  • polyester fibres of fineness 1.7 dtex made by known methods, containing 0.014% of a mixture of optical brighteners of structures 5a-c in an approximate ratio of 30:50:20, and cut to 0.5 mm, are stirred with 0.025 parts dispersing agent (Cartaspers® PSM, commercially available from Clariant) and 1000 parts water for 5 minutes to form a 0.5% dispersion of optically brightened fibres.
  • dispersing agent Cartaspers® PSM, commercially available from Clariant
  • x parts of the 0.5% dispersion of optically brightened fibres are then added to (1000-x) parts of a stirred 0.5% aqueous suspension of a 50:50 mixture of bleached birch and spruce wood pulps beaten to a Schopper-Riegler freeness of 35°.
  • Each paper sheet is measured for R457 Brightness on a calibrated Minolta 3270D spectrophotometer.
  • Fig 1 Effect of exposure to light over 280 hours on R457 Brightness of papers containing 5-30% optically brightened polyester fibres.
  • a paper sheet is made as in the Example, but without the addition of optically brightened polyester fibres.
  • Comparative Example 4 Unbrightened polyester fibres and optical brightener (5a-c)
  • Fig 2 Effect of exposure to light over 280 hours on R457 Brightness of papers.
  • Comparative Examples demonstrate the advantage of the invention in providing a bright paper with excellent lightfastness.

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  • Paper (AREA)

Abstract

The instant invention relates to a process for the production of optically brightened paper by treating the pulp suspension with an optically brightened filler composition comprising optically brightened plastic fibres, preferably polyester fibres, which leads to a surprising high lightfastness of the resulting paper.

Description

PROCESS FOR PRODUCING OPTICALLY BRIGHTENED PAPER
The present invention relates to a process for the production of optically brightened paper by treating the pulp suspension with an optically brightened filler composition.
A high degree of brightness is a desirable property of paper and cardboard articles. The most important raw material of the papermaking industry is pulp, which naturally absorbs blue light and therefore is yellowish in color and imparts a dull appearance to the paper. Optical brighteners are used in the papermaking industry to compensate for the absorption of blue light by absorbing UV-light with a maximum wavelength of 350- 380nm and converting it into visible blue light with a maximum wavelength of 440nm.
Optical brighteners of the triazinylaminostilbene type have been used almost exclusively to brighten paper either by application to pulp or to the paper surface. It is well-known however that the lightfastness of brighteners of this type is no better than poor to moderate, or 1 to approximately 3 on the "Blue Wool Scale". (See "Optische Aufheller - neuere Erkenntnisse zu Eigenschaften und Verhalten im Papier" by F. Mϋller, D. Loewe and B. Hunke in Wochenblatt fur Papierfabrikation 1991 , 6, pages 191-203.) There is therefore a demand to protect optically brightened papers from yellowing in light.
In order to provide optically brightened papers of high lightfastness, it is generally recognized that brighteners other than those of the triazinylaminostilbene type must be used; in particular, brighteners typically used for the optical brightening of textiles, such as those of the benzoxazole, naphthalimide, triazolylcoumarin or triazinylpyrene types. Such brighteners are however typically much more expensive, and can only be applied with difficulty to either pulp or to the paper surface.
EP-A-801 700 overcomes some of these problems by describing the use of optically brightened polyacrylonitrile powder to prepare white coating slips for paper. Preferred optical brighteners are those typically used to provide a high lightfastness on textiles, for example of the triazolylcoumarin or benzoxazole type. Papers prepared using such coating slips show excellent whitening effects with high lightfastness. There is no suggestion however that this approach could be used to prepare optically brightened papers by a more economic pulp application. The economic use of textile brighteners to prepare optically brightened papers is therefore a difficult problem to which a satisfactory solution has not yet been found.
Surprisingly, it has now been found that by treating a pulp suspension with a filler composition comprising finely divided optically brightened plastic fibres, an optically brightened paper of high lightfastness is obtained in an economic manner.
Therefore an object of the instant invention is a process for optical brightening of paper wherein a filler composition comprising optically brightened plastic fibres is added to the pulp suspension.
Said fibres preferably can be made from polyester, polyethylene, polypropylene or polyamide. Most preferably the fibres are made from polyester.
The fibres have a fineness between 1 and 10 dtex and are cut to a length of between 0.1 and 1mm, preferably they have a fineness between 1 and 2 dtex and a length between 0.2 and 0.6mm.
The preparation of polyester fibres is well-known and is described, for example, in "Handbook of Fiber Chemistry" by Menachem Lewin published in 1998 by Marcel Dekker, page 18.
The production of optically brightened polyester is equally well-known and is described, for example, in GB 835,898 and EP-A-1 379 585.
For the purpose of the present invention, the fibres are preferably optically brightened with compounds of formulae (1 ) to (4)
Figure imgf000003_0001
(2)
Figure imgf000004_0001
C4)AlRyI
Figure imgf000004_0002
where in formula (1)
R1 to R8 independently of one another are hydrogen, Ci-C2o-alRyl or groups of the formula -COORg, where R9 is hydrogen, Ci-C2o-alkyl or phenyl, or R1 to R8 are a group of the formula -SO2RiO, where Ri0 is hydrogen, CrC10-alRyl or Ci-C10-hydroxyalkyl, and A is stilbene, naphthalene, phenylene, thiophenylene or biphenylene, or mixtures of said compounds.
More preferred optical brighteners are compounds of formula (1 ) where R-i to R8 independently of one another are hydrogen or Ci-C4-alkyl, and A is stilbene, naphthalene, phenylene, thiophenylene or biphenylene.
Most preferred optical brighteners are compounds of formula (1 ) where R1 to R8 independently of one another are hydrogen or methyl, and A is stilbene. The optically brightened plastic fibre contains between 10 and 500 ppm optical brightener, preferably between 20 and 250 ppm.
The pulp may be any conventional pulp used to produce paper, for example stone groundwood pulp, thermomechanical pulp, chemithermomechanical pulp, semichemical pulp, sulphite pulp or kraft pulp, or a mixture of these.
In general the pulp suspension is treated with 2 to 60%, preferably 10 to 40% by weight, based on weight of dry pulp, of the instant filler composition.
The filler composition may be added to the pulp suspension either in dry form or, preferably, in the form of an aqueous dispersion. It may be useful to add a dispersing agent, particularly suitable dispersing agents being of the type described in EP-A-964 015. Finally, the paper is formed on a wire screen of a conventional paper machine, pressed and dried.
The present invention also provides an optically brightened paper produced according to the instant process and which comprises 2 to 60%, preferably 10 to 40% by weight, based on weight of dry pulp, of the filler composition of the instant invention.
The optically brightened paper may also contain other additives commonly employed in the papermaking industry. Examples of such additives include sizing agents (for example, rosin, starch, alkyl ketene dimer, alkenyl succinic anhydride), wet strength resins (for example, poly-aminoamide-epichlorohydrin resins), retention- and drainage aids (for example, poly-aluminium chloride, polydiallyldimethylammonium chloride), and shading dyes.
The following example further serves to illustrate the invention. All parts and all percentages are by weight, unless indicated to the contrary. EXAMPLE
5 parts polyester fibres of fineness 1.7 dtex made by known methods, containing 0.014% of a mixture of optical brighteners of structures 5a-c in an approximate ratio of 30:50:20, and cut to 0.5 mm, are stirred with 0.025 parts dispersing agent (Cartaspers® PSM, commercially available from Clariant) and 1000 parts water for 5 minutes to form a 0.5% dispersion of optically brightened fibres.
Figure imgf000006_0001
x parts of the 0.5% dispersion of optically brightened fibres are then added to (1000-x) parts of a stirred 0.5% aqueous suspension of a 50:50 mixture of bleached birch and spruce wood pulps beaten to a Schopper-Riegler freeness of 35°. A paper sheet is then made by drawing the dispersed suspension through a wire mesh. After being pressed and dried, the optically brightened paper contains between 5% (x = 50) and 30% (x = 300) optically brightened polyester fibres, equivalent to an optical brightener content of between 7 ppm and 42 ppm.
Each paper sheet is measured for R457 Brightness on a calibrated Minolta 3270D spectrophotometer.
Accelerated ageing experiments are conducted by exposing the papers in a Xenotest apparatus. R457 Brightness measurements are made at intervals of 70, 140 and 280 hours. The results are shown below in tabular (Table 1 ) and graphical (Fig 1 ) forms. TABLE 1
Figure imgf000007_0002
Figure imgf000007_0001
0 50 100 150 200 250 300
Exposure time in hours
Fig 1 : Effect of exposure to light over 280 hours on R457 Brightness of papers containing 5-30% optically brightened polyester fibres.
It is clear from the results that the present invention provides an optically brightened paper of high lightfastness, with the additional advantage that a surprisingly low concentration (7-42 ppm) of optical brightener is required to achieve a high degree of brightness. COMPARATIVE EXAMPLES
Comparative Example 1 : Brightened polyester fibres A paper sheet is made as in the Example, containing 25% (x = 250) optically brightened polyester fibres.
Comparative Example 2: Unbriqhtened pulp
A paper sheet is made as in the Example, but without the addition of optically brightened polyester fibres.
Comparative Example 3: Unbrightened polyester fibres
A paper sheet is made as in the Example, but containing 25% (x = 250) unbrightened polyester fibres in place of the optically brightened polyester fibres.
Comparative Example 4: Unbrightened polyester fibres and optical brightener (5a-c) A paper sheet is made as in the Example, but containing 25% (x = 250) unbrightened polyester fibres and - added separately to the 1000 parts of 0.5% aqueous suspension of fibres - 0.000175 parts of a mixture of optical brighteners of structures (5a-c) in an approximate ratio of 30:50:20, all in place of the optically brightened polyester fibres.
Comparative Example 5: Unbrightened polyester fibres and optical briqhtener (6)
Figure imgf000008_0001
A paper sheet is made as in the Example, but containing 25% (x = 250) unbrightened polyester fibres and - added separately to the 1000 parts of 0.5% aqueous suspension of fibres - 0.004 parts of an optical brightener of structure (6), all in place of the optically brightened polyester fibres.
Accelerated ageing experiments are conducted as in the Example. The results are shown below in tabular (Table 2) and graphical (Fig 2) forms.
TABLE 2
Figure imgf000009_0002
— « — Comparative Example 1 — ■ — Comparative Example 2 — Δ— Comparative Example 3 — ♦— ComparaSve Example 4 —a — Comparative Example 5
Figure imgf000009_0001
0 50 100 150 200 250 300
Exposure time in hours
Fig 2: Effect of exposure to light over 280 hours on R457 Brightness of papers.
The Comparative Examples demonstrate the advantage of the invention in providing a bright paper with excellent lightfastness.
It is clear that the addition of optically brightened polyester fibres (Comparative Example 1) gives a much brighter paper than does the addition of unbrightened polyester fibres (Comparative Example 3). It is equally clear that the optical brightener must be incorporated into the polyester fibre, rather than added separately (Comparative Example 4). Whereas the separate addition of an optical brightener (6) of the triazinylaminostilbene type gives a particularly bright paper, the lightfastness of said paper is poor (Comparative Example 5).

Claims

1. Process for optical brightening of paper wherein a filler composition comprising optically brightened plastic fibres is added to the pulp suspension.
2. Process according to claim 1 wherein the fibres are made from polyester, polyethylene, polypropylene or polyamide.
3. Process according to claim 2 wherein the fibres are made from polyester.
4. Process according to claim 3 wherein the fibres have a fineness between 1 and 10 dtex and are cut to a length of between 0.1 and 1 mm.
5. Process according to claim 4 wherein the fibres have a fineness between 1 and 2 dtex and are cut to a length of between 0.2 and 0.6 mm.
6. Process according to any of the preceding claims wherein the fibres are optically brightened with compounds of formulae (1 ) to (4)
Figure imgf000011_0001
(C1-C4)AIKyI (2)
Figure imgf000011_0002
C1-C4)AlKyI
Figure imgf000012_0001
and where in formula (1 )
Ri to R8 independently of one another are hydrogen, d-C2o-alkyl or groups of the formula -COOR9,
R9 is hydrogen, CrC2o-alkyl or phenyl, or
Ri to Re are a group of the formula -SO2R10, where
R10 is hydrogen, Ci-CiO-alkyl or Ci-Ci0-hydroxyalkyl, and A is stilbene, naphthalene, phenylene, thiophenylene or biphenylene, or mixtures of said compounds.
Process according to claim 6 wherein the fibres are optically brightened with a compound of formula (1 ) wherein
Ri to Re independently of one another are hydrogen or Ci-C4-alkyl, and A is stilbene, naphthalene, phenylene, thiophenylene or biphenylene.
Process according to claim 7 wherein
Ri to Re independently of one another are hydrogen or methyl, and
A is stilbene.
Process according to any of claims 2 to 8 wherein the optically brightened plastic fibres contain between 10 and 500 ppm optical brightener.
10. Process according to claim 9 wherein the optically brightened plastic fibres contain between 20 and 250 ppm optical brightener.
1 1. Process according to any of the preceding claims wherein 2 to 60 % by weight, based on the weight of the dry pulp, of the optically brightened filler composition is added to the pulp suspension.
12. Process according to claim 1 1 wherein 10 to 40 % by weight, based on the weight of the dry pulp, of the optically brightened filler composition is added to the pulp suspension.
13. Process according to claims 11 or 12 wherein the optically brightened filler composition is added to the pulp suspension in the form of an aqueous dispersion.
14. Optically brightened paper produced by a process according to any of the preceding claims.
PCT/EP2006/070148 2006-01-26 2006-12-22 Process for producing optically brightened paper WO2007085337A1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
BRPI0621286-7A BRPI0621286A2 (en) 2006-01-26 2006-12-22 process to produce optically brightened paper
CA002636234A CA2636234A1 (en) 2006-01-26 2006-12-22 Process for producing optically brightened paper
JP2008551681A JP2009524747A (en) 2006-01-26 2006-12-22 Method for producing fluorescent white paper
DE602006007388T DE602006007388D1 (en) 2006-01-26 2006-12-22 METHOD FOR PRODUCING OPTICALLY BRIGHTENED PAPER
AT06830803T ATE434083T1 (en) 2006-01-26 2006-12-22 METHOD FOR PRODUCING OPTICALLY BRIGHTENED PAPER
EP06830803A EP1982017B1 (en) 2006-01-26 2006-12-22 Process for producing optically brightened paper
AU2006336948A AU2006336948A1 (en) 2006-01-26 2006-12-22 Process for producing optically brightened paper
US12/223,267 US20100230061A1 (en) 2006-01-26 2006-12-22 Process for Producing Optically Brightened Paper
IL192985A IL192985A0 (en) 2006-01-26 2008-07-23 Process for producing optically brightened paper
NO20083311A NO20083311L (en) 2006-01-26 2008-07-25 Method for making optical illuminated paper

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP06001577 2006-01-26
EP06001577.3 2006-01-26

Publications (1)

Publication Number Publication Date
WO2007085337A1 true WO2007085337A1 (en) 2007-08-02

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US (1) US20100230061A1 (en)
EP (1) EP1982017B1 (en)
JP (1) JP2009524747A (en)
KR (1) KR20080095862A (en)
CN (1) CN101365843A (en)
AR (1) AR059215A1 (en)
AT (1) ATE434083T1 (en)
AU (1) AU2006336948A1 (en)
BR (1) BRPI0621286A2 (en)
CA (1) CA2636234A1 (en)
DE (1) DE602006007388D1 (en)
IL (1) IL192985A0 (en)
NO (1) NO20083311L (en)
RU (1) RU2008134714A (en)
TW (1) TW200738936A (en)
WO (1) WO2007085337A1 (en)
ZA (1) ZA200806504B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9834867B2 (en) 2012-10-10 2017-12-05 Golden Lady Company S.P.A. Polyamide apparel textile yarns and fabrics and garments made therefrom

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WO2002077088A1 (en) * 2001-03-23 2002-10-03 Clariant Gmbh Method for the production of optically brightened polyester

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