WO2006110751A1 - Improved composition and processes for paper production - Google Patents
Improved composition and processes for paper production Download PDFInfo
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- WO2006110751A1 WO2006110751A1 PCT/US2006/013479 US2006013479W WO2006110751A1 WO 2006110751 A1 WO2006110751 A1 WO 2006110751A1 US 2006013479 W US2006013479 W US 2006013479W WO 2006110751 A1 WO2006110751 A1 WO 2006110751A1
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- bleached pulp
- paper
- brightness
- pulp material
- pulp
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Classifications
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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 compositions and processes for improving brightness and optical properties, preventing loss of brightness and for enhancing resistance to thermal yellowing in pulp and paper manufacture. More particularly, this invention concerns compositions, which either alone or in the presence of optical brightening agents effectively enhance the brightness and optical properties of a paper product as well as increase its thermal stability.
- 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 def ⁇ bering 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.
- the present invention provides compositions and 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 (1) providing a bleached pulp material; and (2) contacting the bleached pulp material with an effective amount of one or more reducing agents.
- this invention is a method of making a paper product having enhanced brightness and resistance to thermal yellowing comprising (1) providing a bleached pulp; (2) forming an aqueous stock suspension comprising bleached pulp; (3) draining the stock suspension to form a sheet; and (4) drying the sheet to form the paper product, wherein an effective amount of one or more reducing agents is added to the bleached pulp, to the stock suspension or on to the sheet.
- this invention is a method of preventing brightness loss and yellowing of a bleached pulp material during storage comprising adding an effective amount of one or more reducing agents and optionally one or more chelants and one or more polycarboxylates to the bleached pulp material.
- this invention is a bleached pulp material which comprises the mixed product of bleached pulp and an effective amount of one or more reducing agents, wherein said bleached pulp material has a higher brightness and enhanced resistance to thermal yellowing, when compared with similar pulp not treated with said reducing agents.
- this invention is methods of using reducing agents in combination with chelants and/or optical brighteners to prepare bleached pulp materials having higher brightness, enhanced resistance to thermal yellowing and improved color schemes.
- the reducing agent, optical brighteners and 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 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 run) 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 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, sulfmamides 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 Rl CH(OH)SO 3 H and metal salts thereof where Ri is selected from alkyl, alkenyl, aryl and arylalkyl.
- Representative aldehyde bisulfite adducts include formaldehyde bisulfite adduct HOCH 2 SO 3 Na, and the like.
- "Sulfanamides and ethers of sulfenic acid” means compounds of formula RpS-R 2 , where Ri 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 RiR 3 R 4 R 5 P + X " , whereRi and R 4 -R 5 are as defined above and X is any organic or inorganic anion.
- Representative phosphonium salts include (HO 2 CCHaCH 2 ) S 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.
- alkyl groups include methyl, ethyl, n- and r ⁇ o-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 -NYiY 2 where Yi 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.
- 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, formamidinesulfmate, 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 brightening agents, 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 phosphorates 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 )6N(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 triphosphate 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 H 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-l,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.
- 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.
- Representative optical brighteners include, but are not limited to azoles, biphenyls, coumarins; furans; ionic brighteners, including anionic, cationic, and anionic (neutral) compounds, such as the Eccobrite® and Eccowhite® compounds available from Eastern Color & Chemical Co.
- naphthalimides such as the Leucophor® range of optical brighteners available from the Clariant Corporation (Muttenz, Switzerland), and Tinopal® from Ciba Specialty Chemicals (Basel, Switzerland); 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 optical brighteners are selected from the group of disulfonated, tetrasulfonated and hexasulfonated Tinopal® OBAs.
- the dosage of reducing agents, chelants and/or 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.
- 0.005 to about 2 preferably about 0.05 to about 0.25 weight percent, based on oven-dried pulp of reducing agent is 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, chelants and/or 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 reducing agents, chelants and/or 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, chelant and/or 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 chelant and/or optical brightener can be added to the bleached pulp or paper product before, after or simultaneously with the reducing agent.
- the optical brightener and/or chelant 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, chelants and/or 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, chelants and/or optical brighteners are used in combination with one or more partially neutralized polycarboxylic acids, preferably polycarboxylic acids such as polyacrylic acid (CH 3 CH(C ⁇ 2 H)[CH 2 CH(C ⁇ 2 H)] n CH 2 CH 2 C ⁇ 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.
- this invention is a formulation comprising one or more chelants, one or more reducing agents and one or more polycarboxylic acids.
- the formulation preferably has a pH of about 4-7, more preferably about 5-6.
- this invention is a formulation comprising one or more reducing agents and one or more optical brighteners and optionally one or more chelants or one or more polycarboxylates, or combinations thereof.
- Formulations according to this embodiment preferably have a pH of about 7-11, more preferably about 9-10.
- the reducing agents, chelants and optical brighteners and polycarboxylates 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 (A1 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 Corning Corporation (Midland, MI); fluorochemicals of the general structure CF 3 (CF 2 )JR., wherein R is anionic, cationic or another functional group, such as Gortex; alkylketene dimer (AKD), such as Aquapel 364, Aquapel (1 752, 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. Moreover, the novel composition further protects paper from long-term discoloration during regular use.
- TMP thermomechanical pulp
- CTMP chemi-thermomechanical pulp
- RMP refiner mechanical pulp
- OBA optical brightener
- FAS formamidinesulfinic acid
- TCP for (HOCH 2 CH 2 ) 3 PHC1, tris- carboxyethylphosphonium hydrochloride
- BTHP for [(HOOH ⁇ PMSO ⁇ , 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 C ⁇ 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 , diethylenetri
- DTMPA for H 2 O 3 PCH 2 N[CH 2 CH 2 N(CH 2 PO 3 H 2 ) 2 ] 2 , diethylene-triamine-pentamethylene phosphonic acid; and DTC for sodium dimethyldithiocarbamate.
- 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 dram drying: 100 0 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 0 C, 100% humidity for about 3 days. The samples were equilibrated in a constant humidity room before measuring brightness.
- Brightness reversion experiments thermo aging, pulp: 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 0 C for 3-6 hours. Handsheets were prepared and equilibrated in a constant humidity room before measuring brightness.
- Test Equipment Laboratory drum drier.
- Constant humidity room (23 0 C, 50% humidity).
- the application rod is placed on the scotch tape and a volume of 0.2 ml of the mix is applied on the tape against the rod using a micropipette.
- the agent solution is applied in such away that it is evenly distributed on the tape to cover the entire test sheet.
- Dry Surface Application Procedure (Surface Sizing, Soaking Method): 1. Prepare 8x8-inch hand sheet according to the standard procedure. The target dry weight is 2.5 g. Pass wet hand sheets through one cycle on the drum dryer. 2. Cut l/8th strip of the sheet (0.3 Ig).
- top blotter and the bottom most blotter are removed from the sheet after the press.
- the sheet along with one bottom blotter are cut into 4 smaller test sheets of equal size (approximate dry weight of the sheet is 0.625 g). 4.
- the test sheet is taped along with the blotter to the glass pad as described hi the "dry surface application procedure.”
- Solution 1 is applied as described in the dry surface application procedure.
- test sheet along with the wet blotter is removed from the glass pad, the tape is removed and the blotter is separated from the test sheet. The blotter is discarded.
- test sheet is then drum dried and equilibrated at room temperature.
- An 8x8-inch sheet is made according to the standard procedure. 2. The sheet formed on the screen is then padded with 4 blotters.
- the sheet along with blotters is then couched using a heavy metal roller. This process removes excess water from the sheet to increase the consistency of the sheet to around 20%.
- test sheet is then pressed with 2 blotters on each side.
- Solution 2 is then applied to the sheet, dried and measured as described in steps 3 to 8 of "Dry Surface Application Procedure".
- the chemicals were added directly to the pulp (thin stock or thick stock) and mixed with the pulp in sealed bags.
- 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 0 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.
- 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.
- 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.
- Tables 28-30 illustrate activation of an OBA via prior application of a composition. 6.
- Wet end application introducing a low dose of dithiocarbamates into the composition.
- Tables 31-33 illustrate brightness recovery and long-term stabilization upon application of the proposed formulations.
Abstract
Description
Claims
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
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KR1020077025735A KR101310192B1 (en) | 2005-04-08 | 2006-04-07 | Improved composition and processes for paper production |
EP06740857.5A EP1866477B1 (en) | 2005-04-08 | 2006-04-07 | Improved composition and processes for paper production |
CN2006800005390A CN1993517B (en) | 2005-04-08 | 2006-04-07 | Improved composition and processes for paper production |
BRPI0608006A BRPI0608006B1 (en) | 2005-04-08 | 2006-04-07 | method of preparing a bleached pulp material that has enhanced brightness and increased resistance to thermal yellowing; and bleached pulp material |
JP2008505649A JP5112291B2 (en) | 2005-04-08 | 2006-04-07 | Improved composition and process for papermaking |
CA2601507A CA2601507C (en) | 2005-04-08 | 2006-04-07 | Improved compositions and processes for paper production |
MX2007012385A MX2007012385A (en) | 2005-04-08 | 2006-04-07 | Improved composition and processes for paper production. |
NZ562852A NZ562852A (en) | 2005-04-08 | 2006-04-07 | Improved composition and processes for paper production |
AU2006235427A AU2006235427B2 (en) | 2005-04-08 | 2006-04-07 | Improved composition and processes for paper production |
NO20074836A NO341227B1 (en) | 2005-04-08 | 2007-09-21 | Improved composition and processes for paper production |
Applications Claiming Priority (8)
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US11/102,318 US20060229393A1 (en) | 2005-04-08 | 2005-04-08 | Compositions and methods for enhancing brightness and brightness stabilization in papermaking |
US11/102,318 | 2005-04-08 | ||
US71847505P | 2005-09-19 | 2005-09-19 | |
US60/718,475 | 2005-09-19 | ||
US72184705P | 2005-09-29 | 2005-09-29 | |
US60/721,847 | 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 |
US11/387,499 | 2006-03-23 |
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WO2006110751A1 true WO2006110751A1 (en) | 2006-10-19 |
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EP (1) | EP1866477B1 (en) |
JP (1) | JP5112291B2 (en) |
KR (1) | KR101310192B1 (en) |
AR (1) | AR056309A1 (en) |
AU (1) | AU2006235427B2 (en) |
BR (1) | BRPI0608006B1 (en) |
CA (1) | CA2601507C (en) |
MX (1) | MX2007012385A (en) |
MY (1) | MY177088A (en) |
NO (1) | NO341227B1 (en) |
NZ (1) | NZ562852A (en) |
TW (1) | TWI421390B (en) |
WO (1) | WO2006110751A1 (en) |
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US9932709B2 (en) | 2013-03-15 | 2018-04-03 | Ecolab Usa Inc. | Processes and compositions for brightness improvement in paper production |
US10533060B2 (en) * | 2015-05-15 | 2020-01-14 | Nippon Paper Industries Co., Ltd. | Anion-modified cellulose nanofiber dispersion liquid and composition |
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CA2601507A1 (en) | 2006-10-19 |
MX2007012385A (en) | 2008-03-11 |
CA2601507C (en) | 2013-09-03 |
AR056309A1 (en) | 2007-10-03 |
BRPI0608006A2 (en) | 2009-11-03 |
TW200700612A (en) | 2007-01-01 |
NO341227B1 (en) | 2017-09-18 |
JP2008536020A (en) | 2008-09-04 |
AU2006235427A1 (en) | 2006-10-19 |
KR101310192B1 (en) | 2013-09-25 |
TWI421390B (en) | 2014-01-01 |
NZ562852A (en) | 2010-12-24 |
JP5112291B2 (en) | 2013-01-09 |
KR20080006582A (en) | 2008-01-16 |
EP1866477A4 (en) | 2010-09-01 |
NO20074836L (en) | 2007-09-21 |
EP1866477A1 (en) | 2007-12-19 |
EP1866477B1 (en) | 2017-07-26 |
AU2006235427B2 (en) | 2011-02-03 |
MY177088A (en) | 2020-09-04 |
BRPI0608006B1 (en) | 2017-05-02 |
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