EP1241296A2 - Procédé pour la stabilisation du degré de blancheur de matières fibreuses contenant de la lignine, composition pour stabiliser son degré de blancheur et matières fibreuses ainsi stabilsées - Google Patents

Procédé pour la stabilisation du degré de blancheur de matières fibreuses contenant de la lignine, composition pour stabiliser son degré de blancheur et matières fibreuses ainsi stabilsées Download PDF

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Publication number
EP1241296A2
EP1241296A2 EP02003529A EP02003529A EP1241296A2 EP 1241296 A2 EP1241296 A2 EP 1241296A2 EP 02003529 A EP02003529 A EP 02003529A EP 02003529 A EP02003529 A EP 02003529A EP 1241296 A2 EP1241296 A2 EP 1241296A2
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EP
European Patent Office
Prior art keywords
whiteness
stabilizer
group
lignin
acid
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP02003529A
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German (de)
English (en)
Other versions
EP1241296A3 (fr
Inventor
Dr. Klaus Fischer
Mario Dr. Beyer
Helmut Prof. Dr. Koch
Karsten Dr. Krasselt
Christian Dr. Bäuerlich
Harald Dr. Jakob
Hans Ulrich Dr. Süss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Evonik Operations GmbH
Original Assignee
Degussa GmbH
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 Degussa GmbH filed Critical Degussa GmbH
Publication of EP1241296A2 publication Critical patent/EP1241296A2/fr
Publication of EP1241296A3 publication Critical patent/EP1241296A3/fr
Withdrawn legal-status Critical Current

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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
    • D21H21/143—Agents preventing ageing of paper, e.g. radiation absorbing substances

Definitions

  • the invention relates to a method for Whiteness stabilization with lignin content Fibrous materials, especially paper and cardboard mechanically produced fibrous materials, especially wood pulp, against light-induced yellowing.
  • the process includes the Use of a sulfur-containing whiteness stabilizer.
  • the invention is also directed to the invention available whiteness-stabilized lignin-containing Fibrous materials as well as on a Stabilizer composition.
  • TMP thermomechanically
  • CMP chemo-thermomechanical
  • SGW Stone grinding of wood
  • U.S. Patent 6,059,927 teaches a method of Whiteness stabilization of mechanically produced bleached Pulps. To do this, add a to the mass of the wood pulp Combination of an aqueous formaldehyde solution with a Carbonate used; a further increase in Resistance to yellowing is achieved by using a Polyethylene glycol bisthiols causes, where as Thiol compound exclusively polyethylene glycol bisthiolactate and called polyethylene glycol bisthioglycolate become. The amount of these thiols is in the range of 2 to 6 wt .-%, based on the wood pulp. Disadvantageous This method is the high amount used in the above Bisthiols. There is no reference to this document remove what these bisthioles in the absence of Formaldehyde and carbonate for whiteness stabilization can be used.
  • Thiols which are predominantly odorous compounds: thioglycerin, Dithiothreitol, 2,2'-oxydiethanethiol, 2- (2'-methoxyethoxy) ethanethiol, Thioglycolic acid, 2- and 3-mercaptopropionic acid and their Na salts, diesters of the above Mercaptocarboxylic acid with ethylene glycol and polyethylene glycol and trimethylolpropane tri (3-mercaptopropionate).
  • the object of the present invention is another Process for stabilizing whiteness of lignin Fibrous materials against light-induced yellowing as well as available paper and cardboard with improved To show resistance to yellowing.
  • Whiteness stabilizers should be as odorless as possible and alone, but especially in combination with others known whiteness stabilizers or coadditives the lowest possible total concentration of additives show high effectiveness.
  • Another task is aimed on providing one or more Composition containing whiteness stabilizers, their Use in the bulk of the fiber or in an agent for impregnation or coating, such as sizing or a so-called dash, the fibrous material to a high degree of whiteness stabilization.
  • a whiteness stabilizer from the series of (i) thiols which has at least one aliphatically or cycloaliphatically bound thiol group and additionally at least one further hydrophilic group from the series -OH, -NH 2 , -NHR 1 , -NR 1 R 2 , where R 1 and R 2 are C 1 - to C 4 -alkyl or C 2 to C 4 -hydroxyalkyl, such as hydroxethyl and dihydroxypropyl, C 2 - to C 4 -alkanoyl- or - Hydroxyalkanoyl, or together represent cycloalkyl, have -COOH, -SO 3 H and -PO 3 H 2 and salts of the acid and base function, (ii) thiols which have at least one aliphatically or cycloaliphatically bound thio
  • lignin-containing fibrous materials all materials are understood which are essential Contain a component containing a lignin fiber. at the fibrous materials are in particular Lignin-containing wood materials, however, are also lignin-containing ones Pulp accessible to the process of the invention.
  • a Stabilization of the degree of whiteness and thus prevention of Yellowing is especially so-called high-yield wood pulp, which are thermomechanical (TMP) or chemothermomechanical (CTMP) or by stone grinding (SGW) be obtained of technical importance.
  • TMP thermomechanical
  • CMP chemothermomechanical
  • SGW stone grinding
  • Both mentioned raw materials are inexpensive Raw materials, which with sufficient whiteness stabilization, sowhol in medium quality papers as well high quality paper and cardboard use can find.
  • the method according to the invention is suitable also in a special way to stabilize the whiteness of bleached wood pulp, which without stabilization in tend to yellowing in a special way.
  • the yellowing resistance lignin-containing fibrous materials as well as those made from them Increase materials and thus stabilize the whiteness, when a thiol compound according to the invention is effective Quantity in the manufacture of the fibrous material is used.
  • the amount used depends on the desired degree of stabilization and depending on whether and in what extent other whiteness stabilizers and / or Co-additives in the manufacture of the fibrous material be used.
  • the amount used is usually present Thio compound according to the invention in the range from 0.01 to 5 % By weight, preferably 0.1 to 3% by weight and particularly preferably 0.5 to 2 wt .-%, each based on the dry fiber.
  • thiols which are at least an aliphatic or cycloaliphatic bond Thiol group and additionally at least one demanding have hydrophilic group.
  • thiols can have different structures, such as:
  • Mercapto alcohols of the general formula (HS) m X (OH) n , wherein X is an optionally alkyl-substituted cycloaliphate, a linear or branched hydrocarbon radical having 4 to 20 C atoms, in particular 5 to 8 C atoms, and m and n for a whole Number from 1 to 5. Examples are di-, tri- and tetrathiopentites and hexites.
  • Mercapto alcohols of the general formula (HS) m Y (OH) n in which Y represents a cycloaliphatic, linear or branched hydrocarbon radical with a total of one radical interrupted by a -O-, -S-, -NH or N-alkyl bridge 4 to 20 carbon atoms and m and n have the abovementioned meaning.
  • Examples are reaction products of polyhydric alcohols with ethylene sulfide or a mercaptoalkyl halide, with at least one hydroxyl group remaining on the hydrocarbon radical.
  • Mercapto alcohols of the general formula (HS (CH 2 ) p -COO) m Z (OH) n in which Z has the meaning of X or Y or represents a polymeric hydrocarbon chain, m and n has the aforementioned meaning or in the case of a polymeric skeleton can also far exceed the values mentioned and p stands for 1 or 2, where the mercapto group can be bonded internally or terminally.
  • It is preferably an ester of a polyhydric alcohol, such as ethylene glycol, di-, tri- and polyethylene glycol, propane-1,2 and -1,3-diol, butane-1,4-diol, hexane-1,2,6- triol, trimethylolethane (TME), trimethylolpropane (TMP), erythritol, pentaerythritol (Penta), di-TME, di-TMP, di-penta, sugar alcohols, sugar acids and lactones thereof with a mercaptocarboxylic acid from the series mercaptoacetic acid ( thioglycolic acid) - and 3-mercaptopropionic acid, mono- and dimercaptosuccinic acid.
  • a polyhydric alcohol such as ethylene glycol, di-, tri- and polyethylene glycol, propane-1,2 and -1,3-diol, butane-1,4-diol,
  • the polyhydric alcohol can also be partially esterified with a mercaptocarboxylic acid other than the aforementioned.
  • the polymeric alcohols which are esterified with a mercaptocarboxylic acid are, for example, an oligosaccharide or polysaccharide, such as starch, or polyvinyl alcohol.
  • Particularly suitable mercapto alcohols of the aforementioned Kind are the di- or triester of pentaerythritol with Mercaptoacetic acid or 1 or 2-mercaptopropionic acid, in particular pentaerytritol trithiol glycolate, and the Di-, tri- or tetraester of a pentitol or hexitol, especially sorbitol tetrathioglycolate. It was found, that such compounds have a much better effect have as a whiteness stabilizer similar to previously known structured connections, but not free ones Have more hydroxyl group.
  • Mercaptoamines which act as a hydrophilic group (s) as a hydrophilic group (s) on a linear, cycloaliphatic or branched, carbon skeleton, which can be interrupted once or several times by -O-, -S-, -NH- or N-alkyl, also have a stabilizing effect Contain NH 2 -, NHR 1 - or NR 1 R 2 group, where R 1 and R 2 may be the same or different and stand for a lower alkyl group, such as methyl, ethyl, propyl, hydroxyethyl, hydroxypropyl or dihydroxypropyl or be connected to one another can. Examples are N-mercaptoethyl-diethylenetriamine and N-mercatoethyldiethanolamine, and salts of these amines.
  • Thiols with an acid function as a hydrophilic group exemplary mercapto-succinic acid, Dimercaptosuccinic acid, mercaptopropanesulfonic acid, Mercaptoethylaminomethanphosphonklare.
  • mercapto-succinic acid Dimercaptosuccinic acid
  • mercaptopropanesulfonic acid Mercaptoethylaminomethanphosphonklare.
  • a particularly preferred group of thiols from the group (i) Mercaptoamino acids, such as in particular cysteine, are N-acylated Mercaptoamino acids such as acetylcysteine and diund Oligopeptides with at least one amino acid containing mercapto groups.
  • group (ii) mercapto compounds by additionally at least one olefinic CC double bond is increased (group (ii)).
  • groups (ii) are preferably compounds which have a Have ally structure.
  • heteroaromatics which contain at least one mercapto group on a heteroaromatic have proven to be effective yellowing inhibitors (group (iii)).
  • the heteroaromatics are 5- and 6-membered heteroaromatics, optionally with a fused other aromatic or heteroaromatic ring system. They have one, two or three heteroatoms from the O, S and N series, rings with two or three heteroatoms being preferred, such as from the series s-triazine, thiadiazole, thiazole, diazole.
  • such heteroaromatics optionally also contain one or two amino or alkylated amino groups, alkyl mercapto or alkoxy groups.
  • Monomercapto-diamino-s-triazines and dimercapto-amino-triazine are particularly preferred, it being possible for amino groups to be substituted by one or two C 1 -C 3 -alkyl groups or allyl groups or to be part of a five- or six-membered ring. Examples are: 2-mercapto-4-allylamino-6-diethylamino-s-triazine, 2,4-dimercapto-6-allylamino-s-triazine and 2-mercapto-4-ethylamino-6-morpholino-s-triazine.
  • trimercapto-s-triazine in particular in the form of a mono-, di- and trialkali salt, also stabilizes the whiteness.
  • the mercaptotriazine compounds can be obtained in a manner known per se by stepwise reaction of cyanuric chloride with one or two amines and sodium hydrogen sulfide.
  • Whiteness stabilizers of group (iv) contain one or multiple di- or polysulfide groups on one Heteroaromatics of the type already mentioned or between two heteroaromatics. Be among the polysulfide groups also understood tri- and tetrasulfides.
  • the second function of a polysulfide can be replaced by hydrogen or alkali metal, or be saturated by oligomerization.
  • Examples are 2,4-di-polysulfido-6-diethylamino-s-triazine, bis-2-methylamino-1,3,4-thiadiazin-5-yl-disulfide and bis- [2,4-di (dialkylamino) - triazin-6-yl] tetrasulfide.
  • the preparation of the polysulfidotriazine takes place, for. B.
  • the thiadiazinyl disulfide can be obtained by oxidation of the methylamino-mercapto-1,3,4-thiadiazole with H 2 O 2 , and the said tetrasulfide by reaction of the corresponding bis (dialkylamino) triazinylmercapto compound with S 2 Cl 2 .
  • HALS stabilizers sterically hindered nitroxides and Hydroxylamines and salts thereof
  • the HALS light stabilizers are Compounds as exemplified in WO 99/05108 and U.S. Patents 5,496,875 and 6,080,864. Suitable compounds are e.g. 1-oxyl-2,2,6,6-tetramethyl-4-hydroxypiperidine; 1-hydroxy-2,2,6,6-tetramethyl-4-hydroxypiperidinium chloride or generic carboxylic acid salt such as tetra (1-hydroxy-2,2,6,6-tetramethyl-4-hydroxypiperidinium) ethylenediaminetetraacetate; 1-oxyl-2,2,6,6-tetramethyl-4-alkyloxypiperidin; Octadecyl-2,2,6,6-tetramethyl-4-piperidinylcarbonat.
  • 1-oxyl-2,2,6,6-tetramethyl-4-hydroxypiperidine 1-hydroxy-2,2,6,6-tetramethyl-4-hydroxypiperidinium chloride or generic carboxylic acid salt such as tetra (1-hydroxy-2,2,6,6-tetra
  • the amount used such stabilizers are conveniently located in Range from 0.01 to 2% by weight.
  • combinations Thiols according to the invention, in particular those from the Group (i), such as polyvalent mercaptocarboxylic acid esters Alcohols, amino acids containing thiol groups or Oligopeptides, with HALS light stabilizers lead to whiteness stabilization to a synergistic effect, so the total amount of stabilizers is reduced or the effectiveness by means of a small addition of a HALS stabilizer, such as 0.02 to 0.2% by weight can be increased.
  • 3-Methoxy-4-hydroxybenzylidene malonic acid esters are particularly suitable and 3- (3-methoxy-4-hydroxybenzylidenpentane-2,4-dione.
  • the antioxidants are mostly steric hindered phenols, such as 2,6-di-tert-butyl-4-methylphenol, hydroxylated thiodiphenyl ethers, triazines such as 2,4-bis (octylmercapto) -6- (3,5-di-tert-butyl-4-hydroxyanilino-1,3,5-triazine.
  • Phosphites and phosphonites especially sterically hindered Compounds such as tris (2,4-di-tert-butylphenyl) phosphite, support the degree of whiteness stabilization as Peroxide and radical scavengers work.
  • hydrazine derivatives such as isophthaloyl dihydrazide and N, N-bis (salicyloyl) hydrazine are metal deactivators effective.
  • Another class are complexing agents from the Series of citrates, gluconates, keto acids, Aminocarboxylic acids such as EDTA, DTPA and phosphonates such as Hydroxyethane diphosphonate (HEDP).
  • the fluorescent brighteners are in particular to known substances from the series of stilbene derivatives, such as 4,4 '- (diphenyl) stilbene and 4,4'-bis (triazinylamino) stilbene-2,2'disulfonic acid.
  • Polymeric inhibitors such as polyethylene glycol, Polyvinyl pyrrolidone and polytetrahydrofuran are suitable Costabilatoren.
  • One or more are particularly preferred thiols or di- / polysulfides according to the invention in combination with a HALS light stabilizer or other radical scavenger and a UV absorber from the series of benzotriazoles or Benzophenone and optionally additionally or alternatively an antioxidant, especially a sterically hindered one Phenol, used because it has a synergistic effect comes into its own.
  • particularly effective ones Combinations are: glutathione or sorbitol tetrathioglycolate, 2,2,6,6-tetramethyl-4-hydroxypiperidine N-oxide or a derivative thereof and 2- (2-hydroxyphenyl) benzotriazole.
  • Whiteness stabilizers of the thiol or di / polysulfide series or a combination of these compounds with one or more costabilizers from the range of The aforementioned substance classes can be in different places the manufacturing process of the fibrous material for Get involved. It is possible the one or the Whiteness stabilizers and costabilizers individually or in Form of a composition of the mass of the pulp, the e.g. is in the form of a pulp. The addition is e.g. before, during or after an eventual carried out bleaching stage or during dewatering of the fibrous material possible.
  • Embodiment is the whiteness stabilizer or one contained composition in the form of a solution or Suspension on the at least partially drained Fiber material sprayed on. This spraying process then close at the paper and Carton making known sizing and / or Coating levels.
  • the whiteness stabilizer to be used according to the invention or a composition containing it is added to the medium used for sizing or coating the paper or cardboard and applied to the fiber material with it. It has been found that a substantial increase in the yellowing-inhibiting effect of the whiteness stabilizers to be used according to the invention and the composition containing them is achieved by applying a pigment-containing, in particular titanium dioxide-containing coating after the whiteness stabilizer has been applied, for example by impregnation or together with the application of glue. According to a particularly preferred embodiment, the whiteness stabilizer (s) and optionally costabilizer (s) are applied to the fibrous material together with titanium dioxide and possibly other components of a size or coating and processed in a manner known per se to form the finished paper or cardboard.
  • Another object of the invention is a whiteness-stabilized lignin-containing fibrous material, especially paper and cardboard made from mechanically produced Wood pulp or high-yield pulp, which are bleached or can be unbleached, which is a whiteness stabilizer from the series of the thiols to be used according to the invention, Contains di- or polysulfides of groups (i) to (iv).
  • the whiteness stabilizer can both Mass as well as in a sizing or coating or in a surface layer of the impregnation Fibrous material are.
  • the whiteness-stabilized lignin-containing fibrous material according to the invention contains a coating - this can be sizing or a coating with a coating color which contains titanium dioxide.
  • whiteness stabilizers As in the description of the method according to the invention has been detailed, except for one or several whiteness stabilizers according to the invention also other known whiteness stabilizers and / or Costabilizers in the bulk of the fibrous material or contained in a sizing or coating on this his.
  • Another object of the invention is directed to a Composition, which at least one of the Whiteness stabilizers to be used according to the invention the group (i) to (iv) in an aqueous, organic or aqueous-organic sprayable or coatable contains liquid or pasty medium.
  • the composition contains one or more of the above described preferred stabilizers.
  • Composition additionally one or more others Whiteness stabilizers / costabilizers from the range of Radical scavengers, such as HALS light stabilizers, antioxidants, UV absorbers, reductants, fluorescent brighteners, Metal deactivators, phosphites and aromatic sulfides.
  • the composition contains the combination of one whiteness stabilizer according to the invention, a HALS light stabilizer and / or a UV absorber and / or a Antioxidant.
  • the expedient contains the Composition of at least one of the invention Whiteness stabilizer, a HALS light stabilizer and a UV absorber in a weight ratio of 1 to (0.02 to 0.5) to (0.2 to 2), especially 1 to (0.05 to 0.2) to (0.5 to 2).
  • a preferred composition is a coating color for coating a Fiber material.
  • compositions contain, besides at least one whiteness stabilizer according to the invention additionally titanium dioxide.
  • Compositions for Sizing or a final stroke can be used additionally contain usual sizing components or Binders and other inorganic pigments, Additives and dispersing agents.
  • the invention brings a multitude to the professional world other highly effective whiteness stabilizers for Prevention of yellowing containing lignin Fibrous materials, such as paper and cardboard in particular made available. Let the whiteness stabilizers alone, but preferably in combination with known whiteness stabilizers and / or costabilizers apply, whereby synergistic effects are achieved. A The yellowing resistance is further increased by the additional use of titanium dioxide in the sizing or in one stroke.
  • the objects according to the invention make it possible to produce mechanically produced fibers Manufacture high quality paper and cardboard, since the risk of light-induced yellowing from the Use of whiteness stabilizers according to the invention is decisive is reduced.

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EP02003529A 2001-03-14 2002-02-15 Procédé pour la stabilisation du degré de blancheur de matières fibreuses contenant de la lignine, composition pour stabiliser son degré de blancheur et matières fibreuses ainsi stabilsées Withdrawn EP1241296A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10112101A DE10112101A1 (de) 2001-03-14 2001-03-14 Verfahren zur Weißgradstabilisierung ligninhaltiger Faserstoffmaterialien, Stabilisatorzusammensetzung und damit stabilisierte Faserstoffmaterialien
DE10112101 2001-03-14

Publications (2)

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EP1241296A2 true EP1241296A2 (fr) 2002-09-18
EP1241296A3 EP1241296A3 (fr) 2002-10-16

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EP02003529A Withdrawn EP1241296A3 (fr) 2001-03-14 2002-02-15 Procédé pour la stabilisation du degré de blancheur de matières fibreuses contenant de la lignine, composition pour stabiliser son degré de blancheur et matières fibreuses ainsi stabilsées

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US (1) US20020174491A1 (fr)
EP (1) EP1241296A3 (fr)
AU (1) AU779547B2 (fr)
CA (1) CA2376543A1 (fr)
DE (1) DE10112101A1 (fr)
NO (1) NO20021248L (fr)
NZ (1) NZ517679A (fr)

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DE10163344B4 (de) * 2001-12-21 2006-01-19 Papierfabrik Schoeller & Hoesch Gmbh & Co. Kg Lichtbeständiges Overlaypapier, Verfahren zu dessen Herstellung und Verwendung desselben
DE10343047B4 (de) * 2003-09-16 2008-08-07 Zfb Project-Management Gmbh Antioxidationsmittel für organisches Material und Verfahren zur Behandlung desselben
DE10359533A1 (de) * 2003-12-17 2005-07-28 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Beschichtungsstoffe für Holzsubstrate
WO2013191697A1 (fr) * 2012-06-21 2013-12-27 Empire Technology Development Llc Adhésifs à façon à base de lignosulfonate-carbonate
CN104404825B (zh) * 2014-11-12 2016-08-17 陕西科技大学 一种热稳定型高得率浆返黄抑制剂的制备方法
WO2017172567A1 (fr) 2016-03-28 2017-10-05 The Procter & Gamble Company Compositions rafraîchissantes durables et stables et procédés de rafraîchissement de l'air
CN112064409A (zh) * 2019-06-11 2020-12-11 广州腾龙材料科技有限公司 复合脂肪酸色泽亮度调节剂及其制备方法和应用

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EP0309401A1 (fr) * 1987-09-21 1989-03-29 Ciba-Geigy Ag Stabilisation d'enduits par des amines N-hydroxy substituées avec empêchement stérique
US4871423A (en) * 1987-08-10 1989-10-03 Hoechst Celanese Corporation Enhanced dithionite bleaching
FR2636358A1 (fr) * 1988-09-09 1990-03-16 Centre Tech Ind Papier Procede pour ameliorer la stabilite a la lumiere des materiaux ligno-cellulosiques
GB2284829A (en) * 1993-12-15 1995-06-21 Ciba Geigy Ag Filler and coating composition for paper
EP0751176A1 (fr) * 1995-06-28 1997-01-02 Toyota Jidosha Kabushiki Kaisha Produit moulé en résine et inhibiteur de jaunissement
EP0825188A1 (fr) * 1996-08-17 1998-02-25 Ciba SC Holding AG Composés triaziniques comme azurants optiques, comme absorbants d'UV et leur utilisation dans l'augmentation du facteur de protection solaire de matériaux textiles
WO1999005108A1 (fr) * 1997-07-23 1999-02-04 Ciba Specialty Chemicals Holding Inc. Inhibition du jaunissement de pate et de papier via des oxydes nitres et autres co-additifs
US6030495A (en) * 1994-07-25 2000-02-29 Queens's University At Kingston Method for increasing brightness in pulp paper and polymeric materials
US6059927A (en) * 1997-09-23 2000-05-09 Queen's University At Kingston Method of reducing brightness reversion and yellowness (B*) of bleached mechanical wood pulps

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IT1264946B1 (it) * 1993-07-16 1996-10-17 Ciba Geigy Spa Derivati del 2,2,6,6-tetrametil-4-piperidinolo utili come stabilizzanti alla luce ed all'ossidazione per materiali organici.
US5932735A (en) * 1997-06-13 1999-08-03 Ciba Specialty Chemicals Corporation Derivatives of 1-oxyl-4-hydroxy-2,2,6,6-tetramethylpiperidine as polymerization inhibitors for (meth)acrylate monomers

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Publication number Priority date Publication date Assignee Title
US3892675A (en) * 1973-01-23 1975-07-01 Ici Ltd Coating compositions
US4871423A (en) * 1987-08-10 1989-10-03 Hoechst Celanese Corporation Enhanced dithionite bleaching
EP0309401A1 (fr) * 1987-09-21 1989-03-29 Ciba-Geigy Ag Stabilisation d'enduits par des amines N-hydroxy substituées avec empêchement stérique
FR2636358A1 (fr) * 1988-09-09 1990-03-16 Centre Tech Ind Papier Procede pour ameliorer la stabilite a la lumiere des materiaux ligno-cellulosiques
GB2284829A (en) * 1993-12-15 1995-06-21 Ciba Geigy Ag Filler and coating composition for paper
US6030495A (en) * 1994-07-25 2000-02-29 Queens's University At Kingston Method for increasing brightness in pulp paper and polymeric materials
EP0751176A1 (fr) * 1995-06-28 1997-01-02 Toyota Jidosha Kabushiki Kaisha Produit moulé en résine et inhibiteur de jaunissement
EP0825188A1 (fr) * 1996-08-17 1998-02-25 Ciba SC Holding AG Composés triaziniques comme azurants optiques, comme absorbants d'UV et leur utilisation dans l'augmentation du facteur de protection solaire de matériaux textiles
WO1999005108A1 (fr) * 1997-07-23 1999-02-04 Ciba Specialty Chemicals Holding Inc. Inhibition du jaunissement de pate et de papier via des oxydes nitres et autres co-additifs
US6059927A (en) * 1997-09-23 2000-05-09 Queen's University At Kingston Method of reducing brightness reversion and yellowness (B*) of bleached mechanical wood pulps

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Publication number Publication date
NO20021248D0 (no) 2002-03-13
AU779547B2 (en) 2005-01-27
DE10112101A1 (de) 2002-09-19
NZ517679A (en) 2004-02-27
AU2611702A (en) 2002-09-19
CA2376543A1 (fr) 2002-09-14
NO20021248L (no) 2002-09-16
US20020174491A1 (en) 2002-11-28
EP1241296A3 (fr) 2002-10-16

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