WO1996020308A1 - Bleaching of filled paper - Google Patents

Bleaching of filled paper Download PDF

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Publication number
WO1996020308A1
WO1996020308A1 PCT/US1995/014995 US9514995W WO9620308A1 WO 1996020308 A1 WO1996020308 A1 WO 1996020308A1 US 9514995 W US9514995 W US 9514995W WO 9620308 A1 WO9620308 A1 WO 9620308A1
Authority
WO
WIPO (PCT)
Prior art keywords
paper
bleaching
calcium carbonate
percent
brightness
Prior art date
Application number
PCT/US1995/014995
Other languages
French (fr)
Inventor
Donald Kendall Drummond
Original Assignee
Minerals Technologies Inc.
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 to AU43656/96A priority Critical patent/AU708310B2/en
Application filed by Minerals Technologies Inc. filed Critical Minerals Technologies Inc.
Priority to SK719-97A priority patent/SK284917B6/en
Priority to BR9510425A priority patent/BR9510425A/en
Priority to EP95942429A priority patent/EP0800596B1/en
Priority to MX9704911A priority patent/MX9704911A/en
Priority to DE69517199T priority patent/DE69517199T2/en
Priority to NZ298222A priority patent/NZ298222A/en
Priority to JP8520446A priority patent/JPH10511746A/en
Priority to PL95321045A priority patent/PL321045A1/en
Priority to AT95942429T priority patent/ATE193346T1/en
Publication of WO1996020308A1 publication Critical patent/WO1996020308A1/en
Priority to FI972529A priority patent/FI115225B/en
Priority to NO972996A priority patent/NO972996L/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/32—Bleaching 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
    • D21C9/1026—Other features in bleaching processes

Definitions

  • the present invention relates to a method for improving the optical properties of filled paper. More particularly, the present invention relates to a method for improving the brightness of paper containing calcium carbonate by treating the filled paper with bleaching agents.
  • Papers produced according to the process of the above invention allow papermakers to charge a premium price for the product, while obtaining improved optical properties without significantly increasing the cost of production.
  • the invention may be used on all grades of paper that contain filler. However, the invention is particularly useful on paper that is produced from mechanical pulps. Background of the Invention One of the most important characteristics of paper is the degree of whiteness of the paper. Generally, the whiter the paper, the higher the selling price.
  • Another object of the present invention is to provide an economical process for the production of quality paper produced f om mechanical pulps and calcium carbonate.
  • Yet another object of the present invention is to provide a finished paper product that is particularly useful in applications where a high degree of whiteness is required.
  • a further object of the invention is to allow the papermaker to increase the brightness of paper without the use of an expensive bleaching plant.
  • a final object of the invention is to allow the papermaker to use calcium carbonate fillers and mechanical pulps for producing paper without suffering the effects of alkaline darkening.
  • U.S. Pat. No. 2,510,595 discloses bleaching of groundwood paper with an alkaline solution containing a per-compound, such as hydrogen peroxide, and a phosphate.
  • the process of the present invention is useful on grades of paper that contain filler.
  • the invention is especially useful on grades of paper that are produced from mechanical pulps and calcium carbonate filler.
  • the process of the present invention is useful on grades of paper that contain filler.
  • the present invention i ⁇ especially useful on grades of paper that are produced from mechanical pulps and contain calcium carbonate.
  • Calcium carbonate fillers that are useful in the present invention include, but are not limited to, any calcium carbonate containing mineral, for example, limestone, chalk, dolomite, and synthetically produced precipitated calcium carbonate.
  • Other mineral fillers useful in the present invention include talcs, clays, and synthetic silicon based fillers.
  • the filled paper is produced using standard papermaking techniques well known in the art.
  • the filled paper may contain from about 1 percent to about 40 percent by weight filler. The preferred weight of the filler in the paper is dependent upon the particular grade of paper being produced.
  • Bleaching agents useful in the method of the present invention may be any type of bleaching agent.
  • Bleaching agents especially useful in the method of the present invention are selected from the group consisting of hydrogen peroxide, sodium borohydride, and sodium hydrosulfite.
  • the bleaching agents may be applied as an aqueous solution containing from about 0.1 percent by weight to about 50 percent by weight bleaching agent. Preferably, from about 0.1 percent by weight to about 5 percent by weight based on the weight of the paper is used. More preferably, the level of treating agent is from about 0.1 percent by weight to about 2 percent by weight.
  • the bleaching agent may be applied to the paper after it is produced, such as for example, at the size press or rewinders.
  • Comparative Turbulent-Pulse Former manufactured by Paper Research Materials, Inc., Camas, WA handsheets were prepared using a pulp prepared from 100 percent deinked newsprint supplied by Garden State Paper in Garfield, New Jersey. The pulp was diluted with deionized water to a consistency of about 0.5 percent. Shear speed on the Turbulent Pulse Former was 1000 RPM. Retention agent (high molecular weight cationic or anionic polyacrylamide) was added at about 0.05 percent. Three sets of 40- pound (basis weight) handsheets were prepared containing no filler, 5.5 percent ANSILEX (calcined clay) filler, and 5.6 percent precipitated calcium carbonate filler.
  • the sheets were pressed using a nip pressure of 25 psi and dried on a rotating chrome-plated drum at a temperature of 125°C.
  • the sheets were conditioned at 50 percent relative humidity and 23°C. for a minimum of 24 hours prior to testing.
  • the brightness of the resulting papers was tested using TAPPI test method T452-OM92.
  • the handsheets were subjected to a bleaching treatment of either sodium borohydride or sodium hydrosulfite, in aqueous solution for 1 minute. The bleached handsheets were then pressed and dried again for re-testing. The results are shown in Table 1.
  • Table 1 shows improved brightness is obtained by bleaching clay or calcium carbonate containing papers.
  • Comparative Turbulent-Pulse Former handsheets were prepared from a furnish of Miramichi Dry Groundwood pulp and deionized water. The pulp was mechanically milled on a Disintegrator for 25 minutes and then blended for 2 minutes, after adjusting the pulp consistency to 0.55 percent using deionized water. Retention agent (high molecular weight cationic or anionic polyacrylamide) was added at about 0.05 percent. The sheets were filled with either precipitated calcium carbonate or chalk at target filler levels of 5 and 10 percent. The handsheets were pressed, dried, and conditioned as described in Example 1 prior to testing.
  • the sheets were then subjected to a 1 minute bleaching treatment using 2.5 ml of 0.11 percent hydrogen peroxide solution (10 lb./ton bleach) or 2.5 ml. of 0.22 percent hydrogen peroxide solution (20 lbs./ton bleach).
  • the sheets were then pressed, dried, and conditioned as in Example 1 prior to re-testing. The results are shown in Table 2.
  • Turbulent-Pulse Former handsheets were prepared using a furnish prepared from Miramichi Dry Groundwood pulp and deionized water at a consistency of 0.55 percent. Retention agent was added at 0.05 percent. The sheets contained precipitated calcium carbonate or calcined clay or chalk or talc as fillers, at filler target levels of 5 and 10 percent.
  • the sheetB were pressed, dried, and conditioned as in Example 2 prior to testing. The sheets were then subjected to a 31 minute treatment of 2.5 ml of either 0.11 percent (10 lbs/ton bleach) or 2.5 ml of 0.165 percent (15 lbs/ton bleach) aqueous sodium hydrosulfite. The bleached sheets were then pressed, dried, and conditioned as in Example 2 prior to re-testing. The results are shown in Table 3.
  • Kanzaki Talc 4.8 5.8 41.0 55.4 58.8 58.9 +3.4

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Detergent Compositions (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Wrappers (AREA)
  • Cosmetics (AREA)

Abstract

The present invention discloses the use of bleaching agents to increase the brightness of filled paper. In the process of the present invention, filled paper is treated with bleaching agents during the papermaking process. The process may be used on all grades of paper that contain filler. However, the present invention is particularly useful on low brightness grade papers that are produced from mechanical pulps and contain a calcium carbonate.

Description

BLEACHING OF FILLED PAPER Field of the Invention The present invention relates to a method for improving the optical properties of filled paper. More particularly, the present invention relates to a method for improving the brightness of paper containing calcium carbonate by treating the filled paper with bleaching agents. Papers produced according to the process of the above invention allow papermakers to charge a premium price for the product, while obtaining improved optical properties without significantly increasing the cost of production. The invention may be used on all grades of paper that contain filler. However, the invention is particularly useful on paper that is produced from mechanical pulps. Background of the Invention One of the most important characteristics of paper is the degree of whiteness of the paper. Generally, the whiter the paper, the higher the selling price. Efforts on the part of papermakers to obtain whiter papers have been directed to treatment of the pulp by subjecting it to bleaching agents such as alkaline hypochlorite. However, in bleaching the pulp, large quantities of bleaching agents are required. This contributes to increased production cost, as well as inefficient use and consumption of bleaching agentβ.
Papermakers who produce paper from mechanical pulps lose brightness due to alkaline darkening of the pulp when fillers such as calcium carbonate are used in the papermaking process. This darkening effect restricts the use of certain fillers, such as calcium carbonate, as well as reduces the price that can be charged for papers whose optical properties are less than desired. Because of the increased cost of using current bleaching techniques, a more economical bleaching technique is required. Additionally, because of the darkening that occurs in paper that contain mechanical pulps and fillers such as calcium carbonate, a technique to regain the brightness losses in this type of paper is required.
What has been found to be novel and unanticipated by the prior art is a process for bleaching papers containing mechanical pulps and fillers such as calcium carbonate, clay, and talc.
It is therefore an object of the present invention to provide a process for brightening filled paper. Another object of the present invention is to provide an economical process for the production of quality paper produced f om mechanical pulps and calcium carbonate. Yet another object of the present invention is to provide a finished paper product that is particularly useful in applications where a high degree of whiteness is required. A further object of the invention is to allow the papermaker to increase the brightness of paper without the use of an expensive bleaching plant. A final object of the invention is to allow the papermaker to use calcium carbonate fillers and mechanical pulps for producing paper without suffering the effects of alkaline darkening.
These and other objects of the present invention will become apparent as further provided in the detailed specification which follows.
Prior Related Art U.S. Pat. No. 2,150,926 discloses a process for bleaching sheet materials formed of fibrous pulp of vegetable origin by using hydrogen peroxide or substances generating hydrogen peroxide in solution.
U.S. Pat. No. 2,510,595 discloses bleaching of groundwood paper with an alkaline solution containing a per-compound, such as hydrogen peroxide, and a phosphate.
U.S. Pat. No. 2,613,579 discloses simultaneous bleaching and sizing of paper sheets with an alkaline aqueous solution of hydrogen peroxide and a wax dispersion. According to Tang, "Stabilization of
Paper Through Sodium Borohydride Treatment1-, American Chemical Society, Pages 212, 427-441 (1986) , reducing agents, such as sodium borohydride have been used to brighten paper. None of the above referenced subject matter in whole or in part suggests that filled paper produced with mechanical pulps can be brightened through the use of various bleaching agents. Sxumnarv of the Invention
What has been found to be novel and unanticipated by prior art is a method for improving the optical properties of filled paper by bleaching the paper.
The process of the present invention is useful on grades of paper that contain filler. The invention is especially useful on grades of paper that are produced from mechanical pulps and calcium carbonate filler. Detailed Description of the Invention
The process of the present invention is useful on grades of paper that contain filler. The present invention iβ especially useful on grades of paper that are produced from mechanical pulps and contain calcium carbonate. Calcium carbonate fillers that are useful in the present invention include, but are not limited to, any calcium carbonate containing mineral, for example, limestone, chalk, dolomite, and synthetically produced precipitated calcium carbonate. Other mineral fillers useful in the present invention include talcs, clays, and synthetic silicon based fillers. The filled paper is produced using standard papermaking techniques well known in the art. The filled paper may contain from about 1 percent to about 40 percent by weight filler. The preferred weight of the filler in the paper is dependent upon the particular grade of paper being produced.
Bleaching agents useful in the method of the present invention may be any type of bleaching agent. Bleaching agents especially useful in the method of the present invention are selected from the group consisting of hydrogen peroxide, sodium borohydride, and sodium hydrosulfite. The bleaching agents may be applied as an aqueous solution containing from about 0.1 percent by weight to about 50 percent by weight bleaching agent. Preferably, from about 0.1 percent by weight to about 5 percent by weight based on the weight of the paper is used. More preferably, the level of treating agent is from about 0.1 percent by weight to about 2 percent by weight. The bleaching agent may be applied to the paper after it is produced, such as for example, at the size press or rewinders. It is believed that when paper containing calcium carbonate iβ bleached with hydrogen peroxide, the alkalinity of the calcium carbonate activates the hydrogen peroxide, resulting in a greater improvement in brightness. What is being suggested here is a theory of why the method of the present invention allows for the bleaching of calcium carbonate containing paper. It should be accepted only as a theory and should not under any conditions whatsoever be employed to limit the scope of the present invention, which is further illustrated by the Examples which follow, and more specifically defined by the Claims. Examples
■RifaTtrpI *> 1
Comparative Turbulent-Pulse Former (manufactured by Paper Research Materials, Inc., Camas, WA) handsheets were prepared using a pulp prepared from 100 percent deinked newsprint supplied by Garden State Paper in Garfield, New Jersey. The pulp was diluted with deionized water to a consistency of about 0.5 percent. Shear speed on the Turbulent Pulse Former was 1000 RPM. Retention agent (high molecular weight cationic or anionic polyacrylamide) was added at about 0.05 percent. Three sets of 40- pound (basis weight) handsheets were prepared containing no filler, 5.5 percent ANSILEX (calcined clay) filler, and 5.6 percent precipitated calcium carbonate filler. The sheets were pressed using a nip pressure of 25 psi and dried on a rotating chrome-plated drum at a temperature of 125°C. The sheets were conditioned at 50 percent relative humidity and 23°C. for a minimum of 24 hours prior to testing. The brightness of the resulting papers was tested using TAPPI test method T452-OM92. The handsheets were subjected to a bleaching treatment of either sodium borohydride or sodium hydrosulfite, in aqueous solution for 1 minute. The bleached handsheets were then pressed and dried again for re-testing. The results are shown in Table 1.
TABLE 1
Handsheet Bleaching Treatment
None 1 lb./ton NaBH4 20 lbs./ton N 2S204
No Filler (Blank) 55.0 55.3 55.3
I
5.5 % ANSILEX Filled 59.1 60.1 59.8 (Calcined Clay)
5.6 % Precipitated Calcium 56.5 57.9 59.3 Carbonate Filled
Table 1 shows improved brightness is obtained by bleaching clay or calcium carbonate containing papers.
Example 2
Comparative Turbulent-Pulse Former handsheets were prepared from a furnish of Miramichi Dry Groundwood pulp and deionized water. The pulp was mechanically milled on a Disintegrator for 25 minutes and then blended for 2 minutes, after adjusting the pulp consistency to 0.55 percent using deionized water. Retention agent (high molecular weight cationic or anionic polyacrylamide) was added at about 0.05 percent. The sheets were filled with either precipitated calcium carbonate or chalk at target filler levels of 5 and 10 percent. The handsheets were pressed, dried, and conditioned as described in Example 1 prior to testing. The sheets were then subjected to a 1 minute bleaching treatment using 2.5 ml of 0.11 percent hydrogen peroxide solution (10 lb./ton bleach) or 2.5 ml. of 0.22 percent hydrogen peroxide solution (20 lbs./ton bleach). The sheets were then pressed, dried, and conditioned as in Example 1 prior to re-testing. The results are shown in Table 2.
Figure imgf000011_0001
Example 3
In the same manner as described in Example 2. Turbulent-Pulse Former handsheets were prepared using a furnish prepared from Miramichi Dry Groundwood pulp and deionized water at a consistency of 0.55 percent. Retention agent was added at 0.05 percent. The sheets contained precipitated calcium carbonate or calcined clay or chalk or talc as fillers, at filler target levels of 5 and 10 percent. The sheetB were pressed, dried, and conditioned as in Example 2 prior to testing. The sheets were then subjected to a 31 minute treatment of 2.5 ml of either 0.11 percent (10 lbs/ton bleach) or 2.5 ml of 0.165 percent (15 lbs/ton bleach) aqueous sodium hydrosulfite. The bleached sheets were then pressed, dried, and conditioned as in Example 2 prior to re-testing. The results are shown in Table 3.
TABLE 3
SODIOM HTDROSDLFITB BLEACHING
Sheet Type % Filler PH Basis Wt. Brightness Brightness Brightness Increase in No Bleach 10 lbs/ton 15 lbs/ton Brightness Bleach Bleach (10 lbs/ton)
Base Stock 0 5.4 41.0 55.0 57.7 57.2 +2.7 (No filler)
Precipitated
Calcium 10.0 8.8 40.8 55.1 60 60.1 +4.9 I
Carbonate
ANSILEX
Calcined 5.4 5.4 41.0 58.4 61.5 61.6 +3.1
Clay
Faxe 5.0 6.3 41.4 55.8 60.1 60.1 +4.3
Chalk
Kanzaki Talc 4.8 5.8 41.0 55.4 58.8 58.9 +3.4
Figure imgf000013_0001
As can be seen in the preceding Ej>cam_les_, bleaching filled paper results in improved paper brightness. This novel method is simple, efficient, and readily adaptable to most paper producing processes.

Claims

C A I M S
1. A method of improving the brightness of filled paper comprising treating a filled paper with an effective amount of bleaching agent selected from hydrogen peroxide, sodium borohydride and sodium hydrosulfite.
2. The method of claim 1, wherein the paper filler is calcium carbonate and the bleaching agent is sodium borohydride, hydrogen peroxide, or sodium hydrosulfite.
3. The method of claim 1, wherein the paper filler is selected from the group consisting of calcium carbonate, clay, talc, and synthetic silicon based fillers and wherein the bleaching agent is sodium hydrosulfite.
4. A method of improving the brightness of a calcium carbonate-containing paper comprising treating the paper with an effective amount of a bleaching agent containing hydrogen peroxide.
5. An improved paper prepared according to any one of the preceding claims.
PCT/US1995/014995 1994-12-28 1995-11-16 Bleaching of filled paper WO1996020308A1 (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
DE69517199T DE69517199T2 (en) 1994-12-28 1995-11-16 BLEACHING OF FILLERED PAPER
SK719-97A SK284917B6 (en) 1994-12-28 1995-11-16 Method of improving the brightness of a paper product by treating it with a bleaching agent
BR9510425A BR9510425A (en) 1994-12-28 1995-11-16 Process for improving the brightness of paper containing filler and improved paper
EP95942429A EP0800596B1 (en) 1994-12-28 1995-11-16 Bleaching of filled paper
MX9704911A MX9704911A (en) 1994-12-28 1995-11-16 Bleaching of filled paper.
AU43656/96A AU708310B2 (en) 1994-12-28 1995-11-16 Bleaching of filled paper
NZ298222A NZ298222A (en) 1994-12-28 1995-11-16 Bleaching filled paper with hydrogen peroxide, sodium borohydride, and/or sodium hydrosulphite
AT95942429T ATE193346T1 (en) 1994-12-28 1995-11-16 BLEACHING PAPER CONTAINING FILLERS
PL95321045A PL321045A1 (en) 1994-12-28 1995-11-16 Loaded paper bleaching process
JP8520446A JPH10511746A (en) 1994-12-28 1995-11-16 Bleaching of filler-containing paper
FI972529A FI115225B (en) 1994-12-28 1997-06-13 Bleaching of paper containing filler
NO972996A NO972996L (en) 1994-12-28 1997-06-26 Bleaching of Filled Paper

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US36525394A 1994-12-28 1994-12-28
US365,253 1994-12-28

Publications (1)

Publication Number Publication Date
WO1996020308A1 true WO1996020308A1 (en) 1996-07-04

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PCT/US1995/014995 WO1996020308A1 (en) 1994-12-28 1995-11-16 Bleaching of filled paper

Country Status (20)

Country Link
US (1) US6602385B1 (en)
EP (1) EP0800596B1 (en)
JP (1) JPH10511746A (en)
CN (1) CN1074073C (en)
AT (1) ATE193346T1 (en)
AU (1) AU708310B2 (en)
BR (1) BR9510425A (en)
CA (1) CA2209014A1 (en)
DE (1) DE69517199T2 (en)
FI (1) FI115225B (en)
IL (1) IL116531A (en)
MX (1) MX9704911A (en)
MY (1) MY138634A (en)
NO (1) NO972996L (en)
NZ (1) NZ298222A (en)
PL (1) PL321045A1 (en)
SK (1) SK284917B6 (en)
TW (1) TW367381B (en)
WO (1) WO1996020308A1 (en)
ZA (1) ZA9510015B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999032710A1 (en) * 1997-12-19 1999-07-01 Kemira Chemicals Oy Bleaching of chemical pulp with peracid
EP1132517A1 (en) * 2000-03-06 2001-09-12 Georgia-Pacific Corporation Method of providing bleached papermaking fibres with durable curl and their absorbent products
US6998015B2 (en) * 1998-10-28 2006-02-14 Pulp And Paper Research Institute Of Canada Method for reducing alkaline darkening of mechanical pulp containing a calcium carbonate filler
US7371356B2 (en) 2002-03-14 2008-05-13 Basf Aktiengesellschaft Method for the production of precipitated calcium carbonate with a high degree of brightness
WO2010104725A1 (en) 2009-03-09 2010-09-16 Nalco Company Method and chemical composition to improve efficiency of mechanical pulp
US8277606B2 (en) 2000-03-06 2012-10-02 Georgia-Pacific Consumer Products Lp Method of providing paper-making fibers with durable curl and absorbent products incorporating same
WO2014149302A1 (en) * 2013-03-15 2014-09-25 Ecolab Usa Inc. Processes and compositions for brightness improvement in paper production

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DE10120526A1 (en) * 2001-04-26 2002-10-31 Voith Paper Patent Gmbh Process for the production of pulp
US7648032B2 (en) * 2004-03-23 2010-01-19 Imerys Pigments, Inc. Effective reductive bleaching of mineral slurries
GB0413068D0 (en) * 2004-06-11 2004-07-14 Imerys Minerals Ltd Treatment of pulp
JP5563195B2 (en) * 2005-01-21 2014-07-30 コモンウェルス サイエンティフィック アンドインダストリアル リサーチ オーガナイゼーション Activation method using a modifying substance
JP4846405B2 (en) * 2006-03-27 2011-12-28 北越紀州製紙株式会社 Method for producing paper-containing thermoplastic resin composition
JP5506228B2 (en) * 2008-04-04 2014-05-28 丸尾カルシウム株式会社 Colloidal calcium carbonate filler, method for producing the same, and resin composition containing the filler
JP2011073899A (en) * 2009-09-29 2011-04-14 Okutama Kogyo Co Ltd Method for producing light calcium carbonate
TW201418545A (en) * 2012-11-13 2014-05-16 Real Green Material Technology Corp Stone-made environmental paper and a method for making the same

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DE1293019B (en) * 1960-12-31 1969-04-17 Stiftelsen Wallboardindustrien Process for producing a bright white surface layer on objects containing lignocellulose, such as paper cardboard
WO1993022501A1 (en) * 1992-04-24 1993-11-11 Kymi Paper Mills Ltd. Bleaching of a paper web with peroxide

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999032710A1 (en) * 1997-12-19 1999-07-01 Kemira Chemicals Oy Bleaching of chemical pulp with peracid
US6998015B2 (en) * 1998-10-28 2006-02-14 Pulp And Paper Research Institute Of Canada Method for reducing alkaline darkening of mechanical pulp containing a calcium carbonate filler
EP1132517A1 (en) * 2000-03-06 2001-09-12 Georgia-Pacific Corporation Method of providing bleached papermaking fibres with durable curl and their absorbent products
US6627041B2 (en) 2000-03-06 2003-09-30 Georgia-Pacific Corporation Method of bleaching and providing papermaking fibers with durable curl
US7291247B2 (en) 2000-03-06 2007-11-06 Georgia-Pacific Consumer Operations Llc Absorbent sheet made with papermaking fibers with durable curl
US8277606B2 (en) 2000-03-06 2012-10-02 Georgia-Pacific Consumer Products Lp Method of providing paper-making fibers with durable curl and absorbent products incorporating same
US7371356B2 (en) 2002-03-14 2008-05-13 Basf Aktiengesellschaft Method for the production of precipitated calcium carbonate with a high degree of brightness
WO2010104725A1 (en) 2009-03-09 2010-09-16 Nalco Company Method and chemical composition to improve efficiency of mechanical pulp
WO2014149302A1 (en) * 2013-03-15 2014-09-25 Ecolab Usa Inc. Processes and compositions for brightness improvement in paper production
CN105164338B (en) * 2013-03-15 2017-11-10 艺康美国股份有限公司 The method and composition of brightness improving in being manufactured for paper
US9932709B2 (en) 2013-03-15 2018-04-03 Ecolab Usa Inc. Processes and compositions for brightness improvement in paper production

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JPH10511746A (en) 1998-11-10
FI115225B (en) 2005-03-31
EP0800596A1 (en) 1997-10-15
FI972529A (en) 1997-06-13
DE69517199D1 (en) 2000-06-29
CN1171827A (en) 1998-01-28
MX9704911A (en) 1997-10-31
NO972996L (en) 1997-08-15
AU708310B2 (en) 1999-07-29
FI972529A0 (en) 1997-06-13
ATE193346T1 (en) 2000-06-15
US6602385B1 (en) 2003-08-05
EP0800596B1 (en) 2000-05-24
AU4365696A (en) 1996-07-19
NZ298222A (en) 1999-07-29
ZA9510015B (en) 1996-06-04
BR9510425A (en) 1998-07-07
SK284917B6 (en) 2006-02-02
PL321045A1 (en) 1997-11-24
IL116531A0 (en) 1996-03-31
IL116531A (en) 2000-06-01
MY138634A (en) 2009-07-31
TW367381B (en) 1999-08-21
DE69517199T2 (en) 2000-12-14
NO972996D0 (en) 1997-06-26
CA2209014A1 (en) 1996-07-04
CN1074073C (en) 2001-10-31
SK71997A3 (en) 1997-10-08

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