EP1866477B1 - Composition amelioree et procedes de production de papier - Google Patents

Composition amelioree et procedes de production de papier Download PDF

Info

Publication number
EP1866477B1
EP1866477B1 EP06740857.5A EP06740857A EP1866477B1 EP 1866477 B1 EP1866477 B1 EP 1866477B1 EP 06740857 A EP06740857 A EP 06740857A EP 1866477 B1 EP1866477 B1 EP 1866477B1
Authority
EP
European Patent Office
Prior art keywords
pulp
salts
paper
acid
composition
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.)
Active
Application number
EP06740857.5A
Other languages
German (de)
English (en)
Other versions
EP1866477A1 (fr
EP1866477A4 (fr
Inventor
Prasad Duggirala
Sergey Shevchenko
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.)
ChampionX LLC
Original Assignee
Nalco Co LLC
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
Priority claimed from US11/102,318 external-priority patent/US20060229393A1/en
Priority claimed from US11/387,499 external-priority patent/US8246780B2/en
Application filed by Nalco Co LLC filed Critical Nalco Co LLC
Publication of EP1866477A1 publication Critical patent/EP1866477A1/fr
Publication of EP1866477A4 publication Critical patent/EP1866477A4/fr
Application granted granted Critical
Publication of EP1866477B1 publication Critical patent/EP1866477B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1042—Use of chelating agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1084—Bleaching ; Apparatus therefor with reducing compounds
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/09—Sulfur-containing compounds
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/14—Carboxylic acids; Derivatives thereof
    • D21H17/15—Polycarboxylic acids, e.g. maleic acid
    • 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
    • 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
    • D21H21/32—Bleaching agents
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • 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
    • D21H5/00—Special paper or cardboard not otherwise provided for
    • D21H5/0005—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/001—Modification of pulp properties
    • D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
    • D21C9/004—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives inorganic compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1047—Conserving the bleached pulp

Definitions

  • This invention relates to processes for improving brightness and optical properties, preventing loss of brightness and for enhancing resistance to thermal yellowing in pulp and paper manufacture.
  • Pulps produced by either mechanical or chemical pulping methods possess a color that can range from dark brown to creamish depending on the wood type and defibering process used.
  • the pulp is bleached to produce white paper products for a multiplicity of applications.
  • Bleaching is the removal or alteration of those light-absorbing substances found in unbleached pulp.
  • the object is to decolorize the pulp without solubilizing the lignin.
  • Either reducing (e.g. sodium hydrosulfite) or oxidizing (e.g., hydrogen peroxide) bleaching agents are usually used.
  • the bleaching is often a multistage process.
  • the bleaching of chemical pulps is an extension of the delignification that started in the digestion stage.
  • the bleaching is often a multistage process, which stages may include chlorine dioxide bleaching, oxygen-alkaline delignification, and peroxide bleaching.
  • Discoloration mostly ascribed to thermal aging, results in yellowing and brightness loss in various stages of papermaking processes employing bleached pulp and in the resultant paper products.
  • the industry invests significantly in chemicals such as bleaching agents and optical brighteners that improve optical properties of the finished paper or paper products. To date, however, the results have been less than satisfactory and the economic losses resulting from discoloration and yellowing present significant ongoing challenges to the industry. Accordingly, there remains a need for a successful and practical solution to loss of brightness and undesirable yellowing of pulp and paper.
  • WO 02/46522 teaches a process for final bleaching cellulose-containing pulp which has been subjected to previous bleaching with a peroxide compound. The process involves the sequential steps of exposing the pulp to an amount of a reducing agent in order to eliminate residual peroxide compound from the pulp and then final bleaching the pulp by exposing the pulp to an amount of formamidine sulfinic acid.
  • WO 05/103135 teaches the treating of mechanical or chemical pulp with about 0.01 weight % to about 5 weight % of a mixture.
  • the mixture is water, diethylenetriaminepentakis (methyl) phosphonic acid or its known salts, polyacrylic acid or its known salts, and optionally one or more inert compounds.
  • the mixture acts to either maintain the brightness level of the pulp at the target level or to increase the brightness level of the pulp.
  • the mixture allows for maintaining the pulp at the target level of brightness even when the amount of other ingredients, such as hydrogen peroxide, hydrosulfite, sodium silicate and magnesium, that are typically added to the pulp, are reduced.
  • JP 09-049195 teaches a method whereby a stilbene-based fluorescent whitening agent is added to a raw pulp slurry together with a reducing agent such as sodium thiosulfate or sodium sulfite. The slurry is then subjected to a papermaking process.
  • the reducing agent may be applied on the paper during papermaking but after the addition of the stilbene or it can be applied after the papermaking process.
  • the method is directed to improving the photo yellowing stability of paper that contains optical brighteners.
  • US 2002/059999 discloses a method for reducing or inhibiting alkaline darkening of mechanical pulp caused by the presence of calcium carbonate filler during production.
  • the method comprises adding a sulfite, or sulfur-containing reducing agent, especially a sulfite to the mechanical pulp and the filler.
  • the method is usefully applied in the production of mechanical pulp and paper in which calcium carbonate is used as a filler and also in the production of paper at neutral or mildly alkaline conditions.
  • the present invention provides methods for improving and stabilizing brightness and enhancing resistance to yellowing in the papermaking process.
  • this invention is a method of preparing a bleached pulp material having enhanced brightness and enhanced resistance to thermal yellowing comprising:
  • the reducing agent, optical brighteners and optionally chelants may be used alone or in combination with known additives to enhance the quality of the desired paper product.
  • the present invention provides an improved process for making paper and paper products exhibiting high optical brightness.
  • Brightness stabilization against thermal yellowing, color improvement and brightness enhancement of bleached pulp and paper product prepared from the bleached pulp can be achieved by adding one or more reducing agents and one or more optical brighteners as defined herein to pulp, paper, paperboard or tissue anywhere in the papermaking process.
  • Brightness is a term used to describe the whiteness of pulp or paper, on a scale from 0% (absolute black) to 100% (relative to a MgO standard, which has an absolute brightness of about 96%) by the reflectance of blue light (457 nm) from the paper.
  • Thermal brightness loss is a brightness loss in paper and pulp under the influence of time, temperature and moisture (non-photochemical brightness loss).
  • “Brightness loss during storage” is thermal brightness loss over time under storage conditions.
  • Yellowing of a bleached pulp material is the loss of brightness of bleached pulp, paper, paperboard, paper tissue and related materials prepared from the bleached pulp over a period of time.
  • bleached pulp material means bleached pulp and paper products prepared from the bleached pulp including paper, paperboard, tissue, and the like.
  • Reducing Agents according to this invention include chemical substances capable of transform functional groups in the bleached pulp from a higher oxidation category to a lower oxidation category.
  • the benefits of this transformation include increased brightness stability in the paper machine and enhanced performance of optical brighteners.
  • the reducing agents are selected from the group consisting of sulfites, bisulfites, metabisulfites (pyrosulfites), sulfoxylates, thiosulfates, dithionites (hydrosulfites), polythionates, formamidinesulfinic acid and salts and derivatives thereof, formaldehyde bisulfite adduct and other aldehyde bisulfite adducts, sulfinamides and ethers of sulfinic acid, sulfenamides and ethers of sulfenic acid, sulfamides, phosphines, phosphonium salts, phosphites, and thiophosphites.
  • sulfites means dibasic metal salts of sulfurous acid, H 2 SO 3 , including dibasic alkali and alkaline earth metal salts such as sodium sulfite (Na 2 SO 3 ), calcium sulfite (CaSO 3 ), and the like.
  • “Bisulfites” means monobasic metal salts of sulfurous acid, H 2 SO 3 , including alkali and alkaline earth metal monobasic salts such as sodium bisulfite (NaHSO 3 ), magnesium bisulfite (Mg(HSO 3 ) 2 ), and the like.
  • Sulfoxylates means salts of sulfoxylic acid, H 2 SO 2 , including zinc sulfoxylate (ZnSO 2 ), and the like.
  • Metalbisulfites means salts of pyrosulfurous acid, H 2 S 2 O 5 , including sodium metabisulfite (Na 2 S 2 O 5 ), and the like.
  • Thiosulfates means salts of thiosulfurous acid, H 2 S 2 O 3 , including potassium thiosulfate (Na 2 S 2 O 3 ), and the like.
  • Dithionites hydrosulfites
  • H 2 S 2 O 4 sodium dithionite (hydrosulfite) (Na 2 S 2 O 4 ), magnesium dithionite (MgS 2 O 4 ), and the like.
  • Aldehyde bisulfite adducts means compounds of formula R1CH(OH)SO 3 H and metal salts thereof where R 1 is selected from alkyl, alkenyl, aryl and arylalkyl.
  • Representative aldehyde bisulfite adducts include formaldehyde bisulfite adduct HOCH 2 SO 3 Na, and the like.
  • Sulfenamides and ethers of sulfenic acid means compounds of formula R 1 -S-R 2 , where R 1 and R 2 are defined above.
  • Representative sulfenamides include ethylsulfendimethylamide (CH 3 CH 2 SN(CH 3 ) 2 ), and the like.
  • Phosphines means derivatives of phosphine, PH 3 , normally organic substituted phosphines of the formula R 6 R 7 R 8 P where R 6 -R 8 are independently selected from H, alkyl, alkenyl, aryl, arylalkyl and NR 4 R 5 where R 4 and R 5 is defined above.
  • Representative phosphines include (HOCH 2 ) 3 P (THP), and the like.
  • Phosphites means derivatives of phosphorous acid P(OH) 3 , including organic substituted phosphites of the formula (R 3 O)(R 4 O)(R 5 O)P where R 3 -R 5 are defined above.
  • Representative phosphites include (CH 3 CH 2 O) 3 P, and the like.
  • Thiophosphites means derivatives of phosphorothious acid HSP(OH) 2 , including organic substituted thiophosphites of formula (R 3 O)(R 4 O)(R 5 S)P where R 3 -R 5 are defined above.
  • Representative thiophosphites include (CH 3 CH 2 O) 2 (CH 3 CH 2 S)P, and the like.
  • Phosphonium salts means organic substituted phosphines of the formula R 1 R 3 R 4 R 5 P + X - , where R 1 and R 4 -R 5 are as defined above and X is any organic or inorganic anion.
  • Representative phosphonium salts include (HO 2 CCH 2 CH 2 ) 3 P + HCr (THP), [(HOCH 2 ) 4 P + ] 2 (SO 4 ) 2- (BTHP), and the like.
  • alkenyl means a monovalent group derived from a straight or branched hydrocarbon containing at least one carbon-carbon double bond by the removal of a single hydrogen atom.
  • the alkenyl may be unsubstituted or substituted with one or more groups selected from amino, alkoxy, hydroxy and halogen.
  • Alkoxy means an alkyl group attached to the parent molecular moiety through an oxygen atom. Representative alkoxy groups include methoxy, ethoxy, propoxy, butoxy, and the like. Methoxy and ethoxy are preferred.
  • Alkyl means a monovalent group derived from a straight or branched chain saturated hydrocarbon by the removal of a single hydrogen atom.
  • the alkyl may be unsubstituted or substituted with one or more groups selected from amino, alkoxy, hydroxy and halogen.
  • Representative alkyl groups include methyl, ethyl, n- and iso -propyl, n -, sec -, iso - and tert -butyl, and the like.
  • Alkylene means a divalent group derived from a straight or branched chain saturated hydrocarbon by the removal of two hydrogen atoms, for example methylene, 1,2-ethylene, 1,1-ethylene, 1,3-propylene, 2,2-dimethylpropylene, and the like.
  • Amino means a group of formula -NY 1 Y 2 where Y 1 and Y 2 are independently selected from H, alkyl, alkenyl, aryl and arylalkyl. Representative amino groups include amino (-NH 2 ), methylamino, ethylamino, isopropylamino, diethylamino, dimethylamino, methylethylamino, and the like.
  • Aryl means aromatic carbocyclic radicals and heterocyclic radicals having about 5 to about 14 ring atoms.
  • the aryl may be unsubstituted or substituted with one or more groups selected from amino, alkoxy, hydroxy and halogen.
  • Representative aryl include phenyl, naphthyl, phenanthryl, anthracyl, pyridyl, furyl, pyrrolyl, quinolyl, thienyl, thiazolyl, pyrimidyl, indolyl, and the like.
  • Arylalkyl means an aryl group attached to the parent molecular moiety through an alkylene group.
  • Representative arylalkyl groups include benzyl, 2-phenylethyl, and the like.
  • Halo and halogen mean chlorine, fluorine, bromine and iodine.
  • Salt means the metal, ammonium, substituted ammonium or phosphonium salt of an inorganic or organic anionic counterion.
  • Representative metals include sodium, lithium, potassium, calcium, magnesium, and the like.
  • Representative anionic counterions include sulfite, bisulfite, sulfoxylate, metabisulfite, thiosulfate, polythionate, hydrosulfite, formamidinesulfinate, and the like.
  • the reducing agent is selected from the group consisting of substituted phosphines, sulfites, bisulfites and metabisulfites.
  • the reducing agent is sodium bisulfite.
  • the process of the present invention can be practiced on conventional papermaking equipment.
  • papermaking equipment varies in operation and mechanical design, the processes by which paper is made on different equipment contain common stages.
  • Papermaking typically includes a pulping stage, bleaching stage, stock preparation stage, a wet end stage and a dry end stage.
  • cellulose fibers are liberated from a source of cellulose either by mechanical or chemical action, or both.
  • Representative sources of cellulose include, but are not limited to, wood and similar "woody” plants, soy, rice, cotton, straw, flax, abaca, hemp, bagasse, lignin-containing plants, and the like, as well as original and recycled paper, paper tissue and paperboard.
  • Such pulps include, but are not limited to, groundwood (GWD), bleached groundwood, thermomechanical pulps (TMP), bleached thermomechanical pulps, chemi-thermomechanical pulps (CTMP), bleached chemi-thermomechanical pulps, deinked pulps, kraft pulps, bleached kraft pulps, sulfite pulps, and bleached sulfite pulps.
  • Recycled pulps may or may not be bleached in the recycling stage, but they are presumed to be originally bleached. Any of the pulps described above which have not previously been subjected to bleaching may be bleached as described herein to provide a bleached pulp material.
  • the bleached pulp material is selected from the group consisting of virgin pulp, recycled pulp, kraft, sulfite pulp, mechanical pulp, any combination of such pulps, recycled paper, paper tissue, and any paper made from such listed pulps or combinations thereof.
  • a further advantage of this invention is that it allows for substituting lower-priced mechanical pulp for higher priced kraft in printing grade kraft-mechanical paper.
  • Use of the chemistry and methods described herein increases the brightness and stability toward yellowing, therefore permitting the use of higher amounts of mechanical pulp, with corresponding reduction in cost, without loss of quality in the resulting paper product.
  • pulp is suspended in water in the stock preparation stage.
  • Additives such as dyes, pigments, fillers, antimicrobial agents, defoamers, pH control agents and drainage aids also may be added to the stock at this stage.
  • stock preparation includes such operations as dilution, screening and cleaning of the stock suspension that may occur prior to forming of the web.
  • the wet end stage of the papermaking process comprises depositing the stock suspension or pulp slurry on the wire or felt of the papermaking machine to form a continuous web of fibers, draining of the web and consolidation of the web ("pressing") to form a sheet.
  • Any papermaking machine known in the art is suitable for use with the process of the present invention. Such machines may include cylinder machines, fourdrinier machines, twin wire forming machines, tissue machines, and the like, and modifications thereof.
  • the web is dried and may be subjected to additional processing like size pressing, calendering, spray coating with surface modifiers, printing, cutting, corrugating and the like.
  • additional processing like size pressing, calendering, spray coating with surface modifiers, printing, cutting, corrugating and the like.
  • the dried paper can be coated by spray coating using a sprayboom.
  • one or more chelants are added to the bleached pulp or paper product.
  • Suitable chelants according to this embodiment include compounds that are capable of chelating transitional metals that form colored products with pulp constituents and catalyze color-forming reactions in the bleached pulp or paper products.
  • the chelant is a compound selected from the group consisting of organic phosphonate, phosphate, carboxylic acids, dithiocarbamates, salts of any of the previous members, and any combination thereof.
  • Organic phosphonates means organic derivatives of phosphonic acid, HP(O)(OH) 2 , containing a single C-P bond, such as HEDP (CH 3 C(OH)(P(O)(OH) 2 ), 1-hydroxy-1,3-propanediylbis-phosphonic acid ((HO) 2 P(O)CH(OH)CH 2 CH 2 P(O)(OH) 2 )); preferably containing a single C-N bond adjacent (vicinal) to the C-P bond, such as DTMPA ((HO) 2 P(O)CH 2 N[CH 2 CH 2 N(CH 2 P(O)(OH) 2 ) 2 ] 2 ), AMP (N(CH 2 P(O)(OH) 2 ) 3 ), PAPEMP ((HO) 2 P(O)CH 2 ) 2 NCH(CH 3 )CH 2 (OCH 2 CH(CH 3 )) 2 N(CH 2 ) 6 N(CH 2 P(O)(OH) 2 ) 2 ),
  • Organic phosphates means organic derivatives of phosphorous acid, P(O)(OH) 3 , containing a single C-P bond, including triethanolamine tri(phosphate ester) (N(CH 2 CH 2 OP(O)(OH) 2 ) 3 ), and the like.
  • Carboxylic acids means organic compounds containing one or more carboxylic group(s), - C(O)OH, preferably aminocarboxylic acids containing a single C-N bond adjacent (vicinal) to the C-CO 2 bond, such as EDTA ((HO 2 CCH 2 ) 2 NCH 2 CH 2 N(CH 2 CO 2 H) 2 ), DTPA ((HO 2 CCH 2 ) 2 NCH 2 CH 2 N(CH 2 CO 2 H)CH 2 CH 2 N(CH 2 CO 2 H) 2 ), and the like and alkaline and alkaline earth metal salts thereof.
  • EDTA ((HO 2 CCH 2 ) 2 NCH 2 CH 2 N(CH 2 CO 2 H) 2 )
  • DTPA ((HO 2 CCH 2 ) 2 NCH 2 CH 2 N(CH 2 CO 2 H)CH 2 CH 2 N(CH 2 CO 2 H) 2 ), and the like and alkaline and alkaline earth metal salts thereof.
  • Dithiocarbamates include monomeric dithiocarbamates, polymeric dithiocarbamates, polydiallylamine dithiocarbamates, 2,4,6-trimercapto-1,3,5-triazine, disodium ethylenebisdithiocarbamate, disodium dimethyldithiocarbamate, and the like.
  • the chelant is a phosphonate.
  • the phosphonate is diethylene-triamine-pentamethylene phosphonic acid (DTMPA) and salts thereof.
  • DTMPA diethylene-triamine-pentamethylene phosphonic acid
  • the chelant is a carboxylic acid.
  • the carboxylate is selected from diethylenetriaminepentaacetic acid (DTPA) and salts thereof and ethylenediaminetetraacetic acid (EDTA) and salts thereof.
  • DTPA diethylenetriaminepentaacetic acid
  • EDTA ethylenediaminetetraacetic acid
  • reducing agents used in combination with optical brighteners enhance the effect of optical brighteners (OBA).
  • OBA's optical brighteners
  • the reducing agents also improve the color scheme. This permits reduction of the amount of OBA's and brighteners such as blue dyes necessary to achieve comparable brightness and color.
  • Replacing some of the OBA and dyes with reducing agents allows pulp and paper manufacturers to reduce production costs and reduce the overall amount of OBA and dyes present, while maintaining an acceptable level of brightness in the paper product and achieving the target color. In some cases it may be possible to eliminate dyes entirely and maintain color.
  • one or more optical brighteners are added to the bleached pulp or paper product.
  • Optical brighteners are fluorescent dyes or pigments that absorb ultraviolet radiation and reemit it at a higher frequency in the visible spectrum (blue), thereby effecting a white, bright appearance to the paper sheet when added to the stock furnish.
  • Optical brighteners to be used according to the invention include azoles, biphenyls, coumarins; furans; naphthalimides; pyrazenes; and salts of such compounds including but not limited to alkali metal salts, alkaline earth metal salts, transition metal salts, organic salts and ammonium salts of such brightening agents; and combinations of one or more of the foregoing agents.
  • the dosage of reducing agents and optical brighteners is the amount necessary to achieve the desired brightness and resistance to yellowing of the bleached pulp or paper product prepared from the bleached pulp and can be readily determined by one of skill in the art based on the characteristics of chelant or optical brightener, the pulp or paper being treated and the method of application.
  • the effective amount of reducing agent added to the bleached pulp or paper product is the amount of reducing agent which enhances the brightness and resistance to thermal yellowing of the pulp or paper compared to pulp or paper which is not treated with the reducing agents. Methods for determining brightness and resistance to thermal yellowing are described herein.
  • about 0.001 to about 1 preferably about 0.01 to about 0.1 weight percent of phosphonate, phosphate or carboxylic acid chelant and/or about 0.002 to about 0.02 weight percent of dithiocarbamates chelant based on oven-dried pulp may be added to the bleached pulp or paper product.
  • Optical brighteners are typically added in amounts of about 0.005 to about 2, preferably 0.05 to about 1 weight percent of optical brightener based on oven-dried pulp.
  • the reducing agents and optical brighteners can be added to bleached pulp or paper at any point in the papermaking or tissue making process.
  • Representative addition points include, but are not limited to (a) to the pulp slurry in the latency chest; (b) to the pulp after the bleaching stage in a storage, blending or transfer chest; (c) to pulp after bleaching, washing and dewatering followed by cylinder or flash drying; (d) before or after the cleaners; (e) before or after the fan pump to the paper machine headbox; (f) to the paper machine white water; (g) to the silo or save all; (h) in the press section using, for example, a size press, coater or spray bar; (i) in the drying section using, for example, a size press, coater or spray bar; (j) on the calender using a wafer box; and/or (k) on paper in an off-machine coater or size press; and/or (1) in the curl control unit.
  • the precise location where the reducing agents and optical brighteners should be added will depend on the specific equipment involved, the exact process conditions being used and the like. In some cases, the reducing agents and optical brighteners may be added at one or more locations for optimal effectiveness.
  • Application can be by any means conventionally used in papermaking processes, including by "split-feeding" whereby a portion of the reducing agent and optical brightener is applied at one point in the papermaking process, for example on pulp or a wet sheet (before the dryers) and the remaining portion is added at a subsequent point, for example in the size press.
  • the optical brightener can be added to the bleached pulp or paper product before, after or simultaneously with the reducing agent.
  • the optical brightener may also be formulated with the reducing agent.
  • one or more reducing agents and one or more optical brighteners are mixed with the surface sizing solution and applied in the size press.
  • the reducing agent is added to bleached pulp after the bleaching stage in the storage, blending or transfer chest.
  • the reducing agents and optical brighteners can also be added with a carrier or additive typically used in paper making, such as retention aids, sizing aids and solutions, starches, precipitated calcium carbonate, ground calcium carbonate, or other clays or fillers, and brightening additives.
  • a carrier or additive typically used in paper making such as retention aids, sizing aids and solutions, starches, precipitated calcium carbonate, ground calcium carbonate, or other clays or fillers, and brightening additives.
  • the reducing agents and optical brighteners are used in combination with one or more partially neutralized polycarboxylic acids, preferably polycarboxylic acids such as polyacrylic acid (CH 3 CH(CO 2 H)[CH 2 CH(CO 2 H)] n CH 2 CH 2 CO 2 H, where n is about 10 to about 50,000.
  • the polycarboxylic acid may be neutralized to the target pH, (typically 5-6 as discussed below) with alkali such as sodium hydroxide.
  • the reducing agents and optical brighteners may be used in addition to other additives conventionally used in papermaking to improve one or more properties of the finished paper product, assist in the process of manufacturing the paper itself, or both. These additives are generally characterized as either functional additives or control additives.
  • Functional additives are typically those additives that are use to improve or impart certain specifically desired properties to the final paper product and include but are not limited to brightening agents, dyes, fillers, sizing agents, starches, and adhesives.
  • Control additives are additives incorporated during the process of manufacturing the paper so as to improve the overall process without significantly affecting the physical properties of the paper.
  • Control additives include biocides, retention aids, defoamers, pH control agents, pitch control agents, and drainage aids.
  • Paper and paper products made using the process of the present invention may contain one or more functional additives and/or control additives.
  • Pigments and dyes impart color to paper.
  • Dyes include organic compounds having conjugated double bond systems; azo compounds; metallic azo compounds; anthraquinones; triaryl compounds, such as triarylmethane; quinoline and related compounds; acidic dyes (anionic organic dyes containing sulfonate groups, used with organic rations such as alum); basic dyes (cationic organic dyes containing amine functional groups); and direct dyes (acid-type dyes having high molecular weights and a specific, direct affinity for cellulose); as well as combinations of the above- listed suitable dye compounds.
  • Pigments are finely divided mineral that can be either white or colored. The pigments that are most commonly used in the papermaking industry are clay, calcium carbonate and titanium dioxide.
  • Fillers are added to paper to increase opacity and brightness.
  • Fillers include but are not limited to calcium carbonate (calcite); precipitated calcium carbonate (PCC); calcium sulfate (including the various hydrated forms); calcium aluminate ; zinc oxides; magnesium silicates, such as talc; titanium dioxide (TiO 2 ) such as anatase or rutile ; clay, or kaolin, consisting of hydrated SiO 2 and Al 2 O 3 ; synthetic clay; mica; vermiculite; inorganic aggregates; perlite; sand; gravel; sandstone; glass beads; aerogels; xerogels ; seagel; fly ash; alumina; microspheres; hollow glass spheres; porous ceramic spheres; cork; seeds; lightweight polymers; xonotlite (a crystalline calcium silicate gel); pumice; exfoliated rock; waste concrete products; partially hydrated or unhydrated hydraulic cement particles; and diatomaceous earth, as well as combinations of such compounds
  • Sizing agents are added to the paper during the manufacturing process to aid in the development of a resistance to penetration of liquids through the paper.
  • Sizing agents can be internal sizing agents or external (surface) sizing agents, and can be used for hard-sizing, slack-sizing, or both methods of sizing.
  • sizing agents include rosin; rosin precipitated with alum (Al 2 (SO 4 ) 3 ); abietic acid and abietic acid homologues such as neoabietic acid and levopimaric acid; stearic acid and stearic acid derivatives; ammonium zirconium carbonate; silicone and silicone- containing compounds, such as RE-29 available from GE-OSI and SM-8715, available from Dow Coming Corporation (Midland, MI); fluorochemicals of the general structure CF 3 (CF 2 ) n R, wherein R is anionic, cationic or another functional group, such as Gortex; alkylketene dimer (AKD), such as Aquapel 364, Aquapel (I 752, Heron) 70, Hercon 79, Precise 787, Precise 2000, and Precise 3000, all of which are commercially available from Hercules, Incorporated (Willmington, DE); and alkyl succinic an
  • Starch has many uses in papermaking. For example, it functions as a retention agent, dry-strength agent and surface sizing agent.
  • Starches include but are not limited to amylose ; amylopectin; starches containing various amounts of amylose and amylopectin, such as 25% amylose and 75% amylopectin (corn starch) and 20 % amylose and 80% amylopectin (potato starch); enzymatically treated starches; hydrolyzed starches ; heated starches, also known in the art as "pasted starches” ; cationic starches, such as those resulting from the reaction of a starch with a tertiary amine to form a quaternary ammonium salt; anionic starches; ampholytic starches (containing both cationic and anionic functionalities); cellulose and cellulose derived compounds; and combinations of these compounds.
  • the method of this invention yields paper products with a bright surface.
  • TMP thermomechanical pulp
  • CTMP chemi-thermomechanical pulp
  • RMP refiner mechanical pulp
  • OBA optical brightener
  • FAS formamidinesulfinic acid
  • TCP for (HOCH 2 CH 2 ) 3 PHCl, tris-carboxyethylphosphonium hydrochloride
  • BTHP for [(HOCH 2 ) 4 P] 2 (SO 4 ), tetra-hydroxymethylphosphonium sulfate
  • THP for (HOCH 2 ) 3 P, tris-hydroxymethylphosphine
  • EDTA for (HO 2 CCH 2 ) 2 NCH 2 CH 2 N(CH 2 CO 2 H) 2 , ethylenediaminetetraacetic acid
  • DTPA for (HO 2 CCH 2 ) 2 NCH 2 CH 2 N(CH 2 CO 2 H)CH 2 CH 2 N(CH 2 CO 2 H) 2
  • Handsheets were made of bleached pulp and then used in the experiments, in which the reducing agents were applied either on a wet sheet (before or after the press) before drum-drying or after drum-drying (temperature during drum drying: 100 °C).
  • the third option was split-feed application.
  • the surface sizing application was followed by one more round on a drum dryer.
  • the load of the tested Agent or Composition solution was determined based on the dry weight of the pulp sample.
  • the Agent or Composition solutions were applied using a rod, as uniformly as possible, as solutions in water.
  • the test sheets were dried using a laboratory drum drier under uniform conditions (one round) and then, after measuring the brightness, subjected to the accelerated aging tests as described below.
  • the 3x9 cm samples cut out of test sheets were kept in a water bath at 70 °C, 100% humidity for about 3 days. The samples were equilibrated in a constant humidity room before measuring brightness.
  • the pulp samples (10% consistency, 5 g pulp on o.d. base) were sealed in plastic bags and kept in a water bath at 70 °C for 3-6 hours. Handsheets were prepared and equilibrated in a constant humidity room before measuring brightness.
  • the chemicals were added directly to the pulp (thin stock or thick stock) and mixed with the pulp in sealed bags.
  • a pulp application procedure for OBA enhancement the chemicals were added directly to the bleached kraft pulp at 20% consistency, mixed with the pulp in sealed bags and kept at 45-80 °C for 30 min.
  • the pulp was diluted to 5% consistency, the OBA was added, mixed with the pulp, and the slurry was kept at 50 °C for 20 min. Then the slurry was further diluted and hand sheets prepared according to the standard procedure.
  • compositions were tested and gave good results in laboratory simulation of the PM application.
  • the chemicals (compositions) not listed in Table 1 were applied as 40% solutions.
  • Table 3 Mixed Kraft-CTMP 1, headbox, surface application with starch (surface sizing solution) on both sides # Treatment Br 1 Control 94.34 2 0.27% Sodium Metabisulfite 96.17
  • Table 4 Mixed Kraft-CTMP 2, headbox, surface application with starch (surface sizing solution) on both sides # Treatment Br 1 Control 94.93 2 0.27% Sodium Metabisulfite 95.63
  • Table 5 Mixed kraft-CTMP 3, headbox # Treatment Br Gain vs. Control Gain vs.
  • Tables 3-8 illustrate the effect of a reducing agent sodium bisulfite (metabisulfite) and a brightness enhancing composition on paper brightness: the reducing agent improves brightness (Tables 3-8), partially compensating for the brightness loss in the dryer (Table 8). The chemistry further more improves brightness in presence of an OBA (Table 5).
  • Tables 9-11 demonstrate the effect of reducing chemicals other than sodium metabisulfite, such as FAS and phosphorous (III) compounds.
  • Control Synergism 1 Control 85.48 0 N/A 2 0.2% Composition C 86.79 1.35 N/A 3 0.2% OBA 89.7 4.21 N/A 4 0.35% OBA 90.73 5.22 N/A 5 0.1% Composition C 86.34 0.81 N/A 6 0.2% OBA + 0.2% Composition C 91.4 5.82 0.26 7 0.2% OBA + 0.1% Composition C 90.78 5.25 0.23 8 0.35% OBA + 0.2% Composition C 92.55 6.87 0.30 9 0.35% OBA + 0.1% Composition C 92.06 6.54 0.51 Table 14 Activation of an optical brightener: kraft pulp 4, Composition C (0, 0.2%) with OBA (0, 0.2%) Br vs.(0,0) OBA1 C0, OBA0 78.24 0 C0, OBA0.2 79.74 1.5 C0.2, OBA0 80.43 2.19 C0.2, OBA0.2 82.53 4.29 Synergism 0.6 Table 15 Mixed kraft-CT
  • Intensity Control 33746 0.2% Composition A 36149 0.35% OBA 106233 0.1% Composition A + 0.35% OBA 111609 0.2% Composition A + 0.35% OBA 116373 0.3% Composition A + 0.35% OBA 119845 Table 16 Kraft headbox containing OBA, activation of an optical brightener as measured by fluorescence intensities: Sample Fluoresc.
  • Tables 12-27 illustrate application of compositions where a reducing agent is combined with chelant(s). Different combinations can be compared (all effective). The formulations improve long-term brightness stability of paper toward thermal aging (Tables 24-27). This set of data also demonstrates an OBA activation by the compositions (Tables 12-14, 25). Applying the formulation allows cutting the dose of an optical brightener. Tables 16 and 17 illustrate the effect of the formulation on fluorescence.
  • Control 1 0 0 86.64 0.00 2 0.5 0.5 91.66 5.02 3 0.5 0.25 90.69 4.05 4 0.25 0.25 89.32 2.68 5 0 0.5 89.00 2.36 6 0.5 0 87.68 1.04 Table 30 Kraft 6, activation of an optical brightener as measured by fluorescence intensities: Sample Fluoresc. Intensity Control 7871 0.5% Composition G 10370 0.5% OBA 128578 0.5% Composition G, then 0.5% OBA 201199 0.25% Composition G, then 0.5% OBA 161354 0.5% Composition G, then 0.25% OBA 157359 0.5% Composition A, then 0.5% OBA 191759
  • Tables 28-30 illustrate activation of an OBA via prior application of a composition.
  • Tables 31-33 illustrate brightness recovery and long-term stabilization upon application of the proposed formulations.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Paper (AREA)

Claims (11)

  1. Procédé de préparation d'un matériau à base de pâte blanchie ayant un degré de blancheur amélioré et une résistance améliorée au jaunissement thermique, comprenant :
    i) la fourniture d'un matériau à base de pâte blanchie ;
    ii) la mise en contact du matériau à base de pâte blanchie avec une quantité efficace d'un ou plusieurs agents réducteurs qui améliore le degré de blancheur et la résistance au jaunissement thermique de la pâte par rapport à de la pâte qui n'est pas traitée avec le (les) agent(s) réducteur(s), et
    iii) la mise en contact du matériau à base de pâte blanchie avec un ou plusieurs azurants optiques choisis dans le groupe constitué des azoles, des biphényles, des coumarines ; des furanes ; des naphtalimides ; des pyrazines ; et des sels de ces composés comportant les sels de métaux alcalins, les sels de métaux alcalinoterreux, les sels de métaux de transition, les sels organiques et les sels d'ammonium ; et leurs mélanges.
  2. Procédé selon la revendication 1 comprenant en outre la mise en contact du matériau à base de pâte blanchie avec un ou plusieurs agents chélateurs.
  3. Procédé selon la revendication 1, dans lequel le matériau à base de pâte blanchie est choisi dans le groupe constitué d'une pâte vierge, d'une pâte recyclée, d'une pâte kraft, d'une pâte au bisulfite, d'une pâte mécanique, d'un mélange quelconque de ces pâtes, d'un papier recyclé, d'un papier absorbant et d'un quelconque papier ou de quelconques produits de papier fabriqués à partir de ces pâtes ou de leurs mélanges.
  4. Procédé selon la revendication 1, dans lequel l'agent réducteur est choisi dans le groupe constitué des sulfites, des bisulfites, des métabisulfites (pyrosulfites), des sulfoxylates, des thiosulfates, des dithionites (hydrosulfites), des polythionates, de l'acide formamidine-sulfinique et de ses sels et dérivés, d'un adduit de formaldéhyde et de bisulfite et d'autres adduits d'aldéhydes et bisulfites, des sulfinamides et des éthers d'acide sulfinique, des sulfénamides et des éthers d'acide sulfénique, des sulfamides, des phosphines, des sels de phosphonium, des phosphites et des thiophosphites.
  5. Procédé selon la revendication 4, dans lequel l'agent réducteur est choisi dans le groupe constitué des phosphines substituées, des sulfites, des bisulfites et des métabisulfites.
  6. Procédé selon la revendication 5, dans lequel l'agent réducteur est le bisulfite de sodium.
  7. Procédé selon la revendication 2, dans lequel l'agent chélateur est choisi dans le groupe constitué des phosphonates organiques, des phosphates, des acides carboxyliques, des dithiocarbamates, des sels d'un quelconque des éléments précités, et de l'un quelconque de leurs mélanges.
  8. Procédé selon la revendication 7, dans lequel l'agent chélateur est choisi dans le groupe constitué de l'acide diéthylène triamine penta-méthylène phosphonique (DTMPA) et ses sels, de l'acide diéthylène triamine penta-acétique (DTPA) et ses sels et de l'acide éthylène diamine tétra-acétique (EDTA) et ses sels.
  9. Procédé selon la revendication 1 comprenant en outre la mise en contact du matériau à base de pâte blanchie avec un ou plusieurs polycarboxylates.
  10. Procédé selon la revendication 9 dans lequel le polycarboxylate est un acide polyacrylique partiellement neutralisé.
  11. Procédé selon la revendication 1 dans lequel les agents réducteurs et les azurants optiques sont mélangés avec une solution de collage en surface et appliqués sur la matière à base de pâte blanchie dans une presse encolleuse.
EP06740857.5A 2005-04-08 2006-04-07 Composition amelioree et procedes de production de papier Active EP1866477B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US11/102,318 US20060229393A1 (en) 2005-04-08 2005-04-08 Compositions and methods for enhancing brightness and brightness stabilization in papermaking
US71847505P 2005-09-19 2005-09-19
US72184705P 2005-09-29 2005-09-29
US11/387,499 US8246780B2 (en) 2005-09-19 2006-03-23 Methods for enhancing brightness and resistance to thermal yellowing of bleached kraft pulp and paper
PCT/US2006/013479 WO2006110751A1 (fr) 2005-04-08 2006-04-07 Composition amelioree et procedes de production de papier

Publications (3)

Publication Number Publication Date
EP1866477A1 EP1866477A1 (fr) 2007-12-19
EP1866477A4 EP1866477A4 (fr) 2010-09-01
EP1866477B1 true EP1866477B1 (fr) 2017-07-26

Family

ID=37087354

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06740857.5A Active EP1866477B1 (fr) 2005-04-08 2006-04-07 Composition amelioree et procedes de production de papier

Country Status (13)

Country Link
EP (1) EP1866477B1 (fr)
JP (1) JP5112291B2 (fr)
KR (1) KR101310192B1 (fr)
AR (1) AR056309A1 (fr)
AU (1) AU2006235427B2 (fr)
BR (1) BRPI0608006B1 (fr)
CA (1) CA2601507C (fr)
MX (1) MX2007012385A (fr)
MY (1) MY177088A (fr)
NO (1) NO341227B1 (fr)
NZ (1) NZ562852A (fr)
TW (1) TWI421390B (fr)
WO (1) WO2006110751A1 (fr)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7638016B2 (en) 2005-02-19 2009-12-29 International Paper Company Method for treating kraft pulp with optical brighteners after chlorine bleaching to increase brightness
US7914646B2 (en) * 2006-07-21 2011-03-29 Nalco Company Compositions and processes for paper production
US8758886B2 (en) 2005-10-14 2014-06-24 International Paper Company Recording sheet with improved image dry time
US7967948B2 (en) * 2006-06-02 2011-06-28 International Paper Company Process for non-chlorine oxidative bleaching of mechanical pulp in the presence of optical brightening agents
DE102007007654A1 (de) * 2007-02-13 2008-08-14 Voith Patent Gmbh FAS Bleiche
EP2559809B1 (fr) 2008-03-31 2015-10-14 International Paper Company Feuille d'enregistrement à qualité d'impression améliorée à de faibles niveaux d'additif
CN102076911B (zh) * 2008-06-20 2013-03-13 国际纸业公司 具有改良光学特性的组合物和记录片材
US20100224333A1 (en) * 2009-03-09 2010-09-09 Prasad Duggirala Method and chemical composition to improve efficiency of mechanical pulp
US9932709B2 (en) * 2013-03-15 2018-04-03 Ecolab Usa Inc. Processes and compositions for brightness improvement in paper production
US8652593B2 (en) 2009-12-17 2014-02-18 International Paper Company Printable substrates with improved brightness from OBAs in presence of multivalent metal salts
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
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
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
WO2011139481A1 (fr) 2010-05-04 2011-11-10 International Paper Company Substrats imprimés revêtus résistant aux surligneurs acides et aux solutions d'impression
EP2596169A1 (fr) 2010-07-23 2013-05-29 International Paper Company Supports imprimables couchés offrant une meilleure qualité et une meilleure résolution d'impression avec une consommation d'encre moins importante
US8697203B2 (en) 2010-11-16 2014-04-15 International Paper Company Paper sizing composition with salt of calcium (II) and organic acid, products made thereby, method of using, and method of making
EP3879029A1 (fr) * 2015-05-15 2021-09-15 Nippon Paper Industries Co., Ltd. Liquide de dispersion de nanofibres de cellulose modifiées par anions, et composition
JP7378198B2 (ja) * 2017-05-15 2023-11-13 大王製紙株式会社 セルロース微細繊維及びその製造方法

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU412980B2 (en) * 1966-10-04 1971-05-05 Commonwealth Scientific And Industrial Research Organization Processes for whitening and/or retarting sunlight yellowing of protein fibres
US3619355A (en) * 1967-09-07 1971-11-09 Georgia Pacific Corp Method for decreasing aging of paper with sulfites and/or bisulfites and product
US4383889A (en) * 1981-09-08 1983-05-17 Nalco Chemical Company Pulp refining process and additive therefor
CA1249402A (fr) * 1984-12-21 1989-01-31 Pulp And Paper Research Institute Of Canada Avivage multi-etage des pates a fort et tres fort rendement
SE456168C (sv) * 1987-02-27 1991-08-12 Mo Och Domsjoe Ab Foerfarande foer ljushetsstabilisering av blekt lignininnehaallande cellulosamassa
JPH01239199A (ja) * 1988-03-18 1989-09-25 Kammerer Gmbh 黄変安定性紙帯の製法および黄変安定性支持材料
SE468054B (sv) * 1990-12-03 1992-10-26 Mo Och Domsjoe Ab Papper samt foerfarande foer framstaellning av papper
GB2277749B (en) * 1993-05-08 1996-12-04 Ciba Geigy Ag Fluorescent whitening of paper
JPH07145583A (ja) * 1993-11-22 1995-06-06 Koei Chem Co Ltd 古紙の脱インキ、漂白方法
DE4403480A1 (de) * 1994-02-04 1995-08-10 Basf Ag Bindemittelmischungen für Papierstreichmassen
JP3457435B2 (ja) * 1995-08-04 2003-10-20 特種製紙株式会社 蛍光増白紙の製造方法
EP0899373A1 (fr) * 1997-08-28 1999-03-03 Ciba SC Holding AG Procédé pour le blanchiment durant la fabrication de pâte à papier contenant de la lignine
EP0905317B1 (fr) * 1997-09-16 2009-12-23 Basf Se Procédé d'azurage optique de papier
NZ331438A (en) * 1997-09-16 2000-01-28 Ciba Sc Holding Ag A method of increasing the whiteness of paper by using a formulation containing a swellale layered silicate and an optical brightener 4,4-bis-(triazinylamino)-stilbene-2,2-disulphonic acid
RU2222654C2 (ru) * 1998-10-22 2004-01-27 Циба Спешиалти Кемикалз Холдинг Инк. Способ предупреждения пожелтения целлюлозы и бумаги с использованием гидроксиламинов и других добавок и композиция с повышенной устойчивостью к пожелтению
US20020088574A1 (en) * 1998-10-22 2002-07-11 Raymond Seltzer Inhibition of pulp and paper yellowing using hydroxylamines and other coadditives
CA2285823C (fr) * 1998-10-28 2007-07-10 Pulp And Paper Research Institute Of Canada Une methode pour reduire le noircissement alcalin de pate mecanique contenant une charge de carbonate de calcium
US6428653B1 (en) * 2000-12-04 2002-08-06 West Fraser Timber Co. Ltd. Method of bleaching with formamidine sulfinic acid using a reducing agent to eliminate residual peroxide
US6702921B2 (en) * 2001-05-01 2004-03-09 Ondeo Nalco Company Methods to enhance pulp bleaching and delignification using an organic sulfide chelating agent
US6743332B2 (en) * 2001-05-16 2004-06-01 Weyerhaeuser Company High temperature peroxide bleaching of mechanical pulps
DE10138631A1 (de) * 2001-08-13 2003-02-27 Basf Ag Verfahren zur Herstellung von beschichtetem Papier mit hoher Weiße
US20060207732A1 (en) * 2002-11-07 2006-09-21 Shoichi Miyawaki Methods for improving discoloration resistance of pulp and pulp improved in discoloration resistance
US7351764B2 (en) * 2004-03-31 2008-04-01 Nalco Company Methods to enhance brightness of pulp and optimize use of bleaching chemicals

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
JP5112291B2 (ja) 2013-01-09
MY177088A (en) 2020-09-04
JP2008536020A (ja) 2008-09-04
NZ562852A (en) 2010-12-24
EP1866477A1 (fr) 2007-12-19
NO20074836L (no) 2007-09-21
NO341227B1 (no) 2017-09-18
EP1866477A4 (fr) 2010-09-01
CA2601507A1 (fr) 2006-10-19
AR056309A1 (es) 2007-10-03
WO2006110751A1 (fr) 2006-10-19
AU2006235427A1 (en) 2006-10-19
MX2007012385A (es) 2008-03-11
KR101310192B1 (ko) 2013-09-25
TW200700612A (en) 2007-01-01
KR20080006582A (ko) 2008-01-16
AU2006235427B2 (en) 2011-02-03
TWI421390B (zh) 2014-01-01
BRPI0608006A2 (pt) 2009-11-03
CA2601507C (fr) 2013-09-03
BRPI0608006B1 (pt) 2017-05-02

Similar Documents

Publication Publication Date Title
EP1866477B1 (fr) Composition amelioree et procedes de production de papier
US8246780B2 (en) Methods for enhancing brightness and resistance to thermal yellowing of bleached kraft pulp and paper
EP3020861B1 (fr) Compositions améliorées et procédés de production de papier
EP2971350B1 (fr) Procédés et compositions pour amélioration du degré de blancheur dans la production de papier
JP2009544857A5 (fr)
CN1993517B (zh) 用于造纸的改进组合物和方法
RU2387751C2 (ru) Улучшенные композиции и способы производства бумаги

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20070810

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

DAX Request for extension of the european patent (deleted)
A4 Supplementary search report drawn up and despatched

Effective date: 20100804

17Q First examination report despatched

Effective date: 20130131

REG Reference to a national code

Ref country code: DE

Ref legal event code: R079

Ref document number: 602006053130

Country of ref document: DE

Free format text: PREVIOUS MAIN CLASS: D21C0009000000

Ipc: D21C0009100000

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20170217

RIC1 Information provided on ipc code assigned before grant

Ipc: D21H 17/09 20060101ALI20170203BHEP

Ipc: D21C 9/10 20060101AFI20170203BHEP

Ipc: D21H 21/30 20060101ALI20170203BHEP

Ipc: D21C 9/00 20060101ALI20170203BHEP

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 912487

Country of ref document: AT

Kind code of ref document: T

Effective date: 20170815

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602006053130

Country of ref document: DE

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20170726

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 912487

Country of ref document: AT

Kind code of ref document: T

Effective date: 20170726

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170726

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170726

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170726

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170726

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171026

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170726

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170726

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170726

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171126

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20171027

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170726

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170726

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170726

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602006053130

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170726

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170726

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20180430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170726

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170726

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20180430

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20180407

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180407

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180407

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180430

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180430

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180407

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170726

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20060407

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170726

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170726

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20230310

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20230207

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FI

Payment date: 20230411

Year of fee payment: 18