[go: up one dir, main page]

CN101365843A - 制备光学增亮纸的方法 - Google Patents

制备光学增亮纸的方法 Download PDF

Info

Publication number
CN101365843A
CN101365843A CNA200680051825XA CN200680051825A CN101365843A CN 101365843 A CN101365843 A CN 101365843A CN A200680051825X A CNA200680051825X A CN A200680051825XA CN 200680051825 A CN200680051825 A CN 200680051825A CN 101365843 A CN101365843 A CN 101365843A
Authority
CN
China
Prior art keywords
paper
optical
optical brightening
fiber
formula
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.)
Pending
Application number
CNA200680051825XA
Other languages
English (en)
Inventor
A·科勒
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.)
Clariant Finance BVI Ltd
Original Assignee
Clariant Finance BVI Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Clariant Finance BVI Ltd filed Critical Clariant Finance BVI Ltd
Publication of CN101365843A publication Critical patent/CN101365843A/zh
Pending legal-status Critical Current

Links

Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H21/00Non-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
    • D21H21/14Non-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
    • D21H21/30Luminescent or fluorescent substances, e.g. for optical bleaching
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H3/00Paper or cardboard prepared by adding substances to the pulp or to the formed web on the paper-making machine and by applying substances to finished paper or cardboard (on the paper-making machine), also when the intention is to impregnate at least a part of the paper body
    • D21H3/82Paper or cardboard prepared by adding substances to the pulp or to the formed web on the paper-making machine and by applying substances to finished paper or cardboard (on the paper-making machine), also when the intention is to impregnate at least a part of the paper body by adding insoluble coloured substances, e.g. powders, fibres, pieces of metal, for obtaining different colours in the paper fancy papers; substances characterised by their physical appearance, e.g. form, rather than by their chemical constitution
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H21/00Non-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
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10Organic non-cellulose fibres
    • D21H13/12Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/14Polyalkenes, e.g. polystyrene polyethylene
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10Organic non-cellulose fibres
    • D21H13/20Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/24Polyesters
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10Organic non-cellulose fibres
    • D21H13/20Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/26Polyamides; Polyimides

Landscapes

  • Paper (AREA)

Abstract

本发明涉及通过用光学增亮填料组合物处理浆料悬浮液而制备光学增亮纸的方法,该光学增亮填料组合物包含光学增亮塑料纤维,优选聚酯纤维,其导致所得纸张令人惊讶的耐光性。

Description

制备光学增亮纸的方法
本发明涉及通过用光学增亮填料组合物处理浆料悬浮液而制备光学增亮纸的方法。
高亮度是纸张和纸板制品的所需性能。造纸工业最重要的原材料是浆料,其自然地吸收蓝光,并且因此颜色是微黄色的且赋予纸张灰暗的外观。在造纸工业中使用光学增亮剂以通过吸收最大波长为350-380nm的紫外光且将转换为最大波长为440nm的可见蓝光而补偿对蓝光的吸收。
三嗪基胺基茋型光学增亮剂已通过施涂至浆料或至纸张表面而几乎被专用于增亮纸张。然而,众所周知,此类型的增亮剂的耐光性几乎等于差至中等,或“蓝羊毛度(blue wool scale)”为1-约30(参见“OptischeAufheller-neuere Erkenntnisse zu Eigenschaften und Verhalten im Papier”,F.Müller,D.Loewe和B.Hunke,见Wochenblatt für Papierfabrikation1991,6,191-203页)。因此,存在保护光学增亮纸在光中不变黄的需要。
为了提供具有高耐光性的光学增亮纸,通常认识到,必须使用除了三嗪基胺基茋型增亮剂以外的增亮剂,具体而言,通常用于光学增亮织物的增亮剂,例如苯并噁唑、萘二甲酰亚胺、三唑基香豆素或三嗪基芘型的增亮剂。然而,这种增亮剂通常昂贵得多,并且仅能困难地施涂至浆料或施涂至纸张表面。
EP-A-801 700通过描述使用光学增亮的聚丙烯腈粉末以制备用于纸张的白色涂料泥釉而克服了这些问题中的一些。优选的光学增亮剂是通常用于在织物上提供高耐光性的例如三唑基香豆素或苯并噁唑型的光学增亮剂。使用这种涂料泥釉制备的纸张显示出具有高耐光性的优异的增白效果。然而,不存在关于该方法可通过较经济的浆料施涂来制备光学增亮纸的建议。
因此,经济地使用织物增亮剂以制备光学增亮纸是一个困难的问题,尚未发现对该问题的满意的解决方案。
令人惊讶地,现已发现,通过用包含精细的光学增亮塑料纤维的填料组合物处理浆料悬浮液,以经济的方式获得了具有高耐光性的光学增亮纸。
因此,本发明的目的是用于光学增亮纸张的方法,其中将包含光学增亮塑料纤维的填料组合物添加至浆料悬浮液中。
所述纤维优选可由聚酯、聚乙烯、聚丙烯或聚酰胺制成。最优选纤维由聚酯制成。
纤维具有1-10分特的细度且被切割为0.1-1mm的长度,优选它们具有1-2分特的细度及0.2-0.6mm的长度。
聚酯纤维的制备是众所周知的,并且描述于例如“Handbook of FiberChemistry”,Menachem Lewin,1998年由Marcel Dekker出版,第18页中。
光学增亮聚酯的制备同样是众所周知的,并且描述于例如GB835,898和EP-A-1 379 585中。
基于本发明的目的,纤维优选用式(1)-(4)的化合物光学增亮:
Figure A200680051825D00061
其中在式(1)中
R1-R8彼此独立地为氢、C1-C20-烷基或式-COOR9的基团,其中R9为氢、C1-C20-烷基或苯基,或R1-R8为式-SO2R10的基团,其中R10为氢、C1-C10-烷基或C1-C10-羟基烷基,并且A为茋、萘、亚苯基、亚噻吩基或亚联苯基或所述化合物的混合物。
更优选的光学增亮剂是式(1)的化合物,其中R1-R8彼此独立地为氢或C1-C4-烷基,并且A为茋、萘、亚苯基、亚噻吩基或亚联苯基。
最优选的光学增亮剂是式(1)的化合物,其中R1-R8彼此独立地为氢或甲基,并且A为茋。
光学增亮塑料纤维含有10-500ppm,优选20-250ppm的光学增亮剂。
浆料可以是用于造纸的任何常规浆料,例如石磨木浆料、热机械浆料、化学热机械浆料、半化学浆料、亚硫酸盐浆料或牛皮纸浆料或它们的混合物。
一般而言,浆料悬浮液用基于干浆料重量2-60wt%,优选10-40wt%的本发明填料组合物来处理。
可以干的形式或优选以含水分散液的形式将填料组合物添加至浆料悬浮液中。添加分散剂,特别是在EP-A-964 015中所描述类型的适当分散剂可能是有用的。最后,在常规造纸机的金属筛网上形成、压制和干燥纸张。
本发明还提供了根据本方法制造的光学增亮纸,并且其包含基于干浆料重量的2-60wt%,优选10-40wt%的本发明填料组合物。
光学增亮纸张还可含有通常在造纸工业中使用的其它添加剂。这种添加剂的实例包括上浆剂(例如松香、淀粉、烷基乙烯酮二聚体、烯基琥珀酸酐)、增湿强用树脂(例如聚胺基酰胺-表氯醇树脂)、保持及排水助剂(例如聚氯化铝、聚二烯丙基二甲基氯化铵)及遮光染料。
以下实施例进一步用于举例说明。除非相反指出,所有份数及所有百分比均以重量计。
实施例
将由已知方法制成的含有0.014%比例为约30:50:20的结构5a-c的光学增亮剂混合物的细度为1.7分特且切割成0.5mm的5份聚酯纤维与0.025份分散剂(
Figure A200680051825D00071
PSM,可商购自Clariant)及1000份水搅拌5分钟,以形成0.5%的光学增亮纤维分散液。
然后将x份0.5%的光学增亮纤维分散液添加至(1000-x)份已打成35°的Schopper-Riegler打浆度的漂白桦木和云杉木浆料的50:50混合物的搅拌的0.5%含水悬浮液中。随后通过经由金属筛网汲取分散的悬浮液而制造纸片。在经压制和干燥后,光学增亮纸含有5%(x=50)-30%(x=300)的光学增亮聚酯纤维,其等于7ppm-42ppm的光学增亮剂含量。
以经校准的Minolta 3270D分光光度计测量每一纸片的R457亮度。
通过将纸张暴露于Xenotest装置中而进行加速老化实验。以70、140和280小时的间隔进行R457亮度测量。以列表(表1)及图形(图1)形式将结果展示在下文中。
表1
 
纸张中增亮纤维%     暴露前R457亮度       70h后R457亮度      140h后R457亮度 280h后R457亮度
0 82.6 83.6 84.3 85.9
5 84.0 85.0 85.3 86.3
10 86.1 86.6 86.6 88.0
15 88.0 88.6 88.6 89.3
20 89.0 89.5 89.3 90.1
25 91.0 91.6 91.3 91.7
30 91.4 92.0 91.8 92.3
Figure A200680051825D00081
图1:曝光280小时对含有5-30%光学增亮聚酯纤维的纸张的R457亮度的影响
从结果清楚可见,本发明提供了具有高耐光性的光学增亮纸,另外的优势在于光学增亮剂的令人惊讶的低浓度(7-42ppm)是得到高度亮度所需要的。
对比例
对比例1:增亮的聚酯纤维
如在实施例中制造含有25%(x=250)光学增亮聚酯纤维的纸片。
对比例2:未增亮的浆料
如在实施例中制造纸片,但未添加光学增亮聚酯纤维。
对比例3:未增亮的聚酯纤维
如在实施例中制造纸片,但含有25%(x=250)未增亮的聚酯纤维而替代光学增亮聚酯纤维。
对比例4:未增亮的聚酯纤维及光学增亮剂(5a-c)
如在实施例中制造纸片,但含有25%(x=250)未增亮的聚酯纤维,及单独向1000份0.5%纤维含水悬浮液中添加的0.000175份比例为约30:50:20的结构(5a-c)的光学增亮剂的混合物而完全替代光学增亮聚酯纤维。
对比例5:未增亮聚酯纤维及光学增亮剂(6)
Figure A200680051825D00091
如在实施例中制造纸片,但含有25%(x=250)的未增亮聚酯纤维及单独向1000份0.5%纤维含水悬浮液中添加的0.004份结构(6)的光学增亮剂而完全替代光学增亮聚酯纤维。
如在实施例中进行加速老化实验。以列表(表2)及图形(图2)形式将结果展示在下文中。
表2
 
对比例 暴露前R457亮度       70h后R457亮度      140h后R457亮度 280h后R457亮度      
1 92.1 93.0 92.9 92.7
2 83.8 85.6 86.5 87.5
3 85.3 87.0 87.7 88.5
4 85.5 87.1 87.8 88.4
5 97.5 90.5 88.7 87.5
Figure A200680051825D00101
图2:曝光280小时对纸张的R457亮度的影响
对比例证明本发明的优势在于提供了具有优异耐光性的明亮纸张。
清楚可见,与添加未增亮的聚酯纤维(对比例3)相比,添加光学增亮的聚酯纤维(对比例1)提供更加明亮的纸张。同样清楚的是,光学增亮剂必须引入到聚酯纤维中而非单独添加(对比例4)。虽然单独添加三嗪基胺基茋型的光学增亮剂(6)提供了特别明亮的纸张,但所述纸张的耐光性是差的(对比例5)。

Claims (14)

1.光学增亮纸张的方法,其中将包含光学增亮的塑料纤维的填料组合物添加到浆料悬浮液中。
2.根据权利要求1的方法,其中所述纤维由聚酯、聚乙烯、聚丙烯或聚酰胺制成。
3.根据权利要求2的方法,其中所述纤维由聚酯制成。
4.根据权利要求3的方法,其中所述纤维具有1-10分特的细度且被切割成0.1-1mm的长度。
5.根据权利要求4的方法,其中所述纤维具有1-2分特的细度且被切割成0.2-0.6mm的长度。
6.根据上述权利要求中任一项的方法,其中所述纤维使用式(1)-(4)的化合物光学增亮:
Figure A200680051825C00021
Figure A200680051825C00031
并且其中在式(1)中
R1-R8彼此独立地为氢、C1-C20-烷基或式-COOR9的基团,
R9为氢、C1-C20-烷基或苯基,或
R1-R8为式-SO2R10的基团,其中
R10为氢、C1-C10-烷基或C1-C10-羟基烷基,并且
A为茋、萘、亚苯基、亚噻吩基或亚联苯基,
或所述化合物的混合物。
7.根据权利要求6的方法,其中所述纤维使用式(1)的化合物光学增亮,其中
R1-R8彼此独立地为氢或C1-C4-烷基,和
A为茋、萘、亚苯基、亚噻吩基或亚联苯基。
8.根据权利要求7的方法,其中
R1-R8彼此独立地为氢或甲基,和
A为茋。
9.根据权利要求2-8中任一项的方法,其中所述光学增亮的塑料纤维含有10-500ppm的光学增亮剂。
10.根据权利要求9的方法,其中所述光学增亮的塑料纤维含有20-250ppm的光学增亮剂。
11.根据上述权利要求中任一项的方法,其中基于干浆料的重量,将2-60wt%的光学增亮的填料组合物添加到该浆料悬浮液中。
12.根据权利要求11的方法,其中基于干浆料的重量,将10-40wt%的光学增亮的填料组合物添加到该浆料悬浮液中。
13.根据权利要求11或12的方法,其中所述光学增亮的填料组合物以含水分散液的形式添加到该浆料悬浮液中。
14.由根据上述权利要求中任一项的方法制备的光学增亮纸。
CNA200680051825XA 2006-01-26 2006-12-22 制备光学增亮纸的方法 Pending CN101365843A (zh)

Applications Claiming Priority (2)

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

Publications (1)

Publication Number Publication Date
CN101365843A true CN101365843A (zh) 2009-02-11

Family

ID=36636660

Family Applications (1)

Application Number Title Priority Date Filing Date
CNA200680051825XA Pending CN101365843A (zh) 2006-01-26 2006-12-22 制备光学增亮纸的方法

Country Status (17)

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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2623219C2 (ru) 2012-10-10 2017-06-23 Голден Леди Компани С.П.А. Полиамидные нити для одежного текстиля и ткани и предметы одежды, изготовленные из них

Family Cites Families (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB835898A (en) * 1955-06-17 1960-05-25 Ciba Ltd New ª‡:ª‰-di-[benzoxazolyl-(2)]-ethylenes
US3342921A (en) * 1966-03-16 1967-09-19 West Virginia Pulp & Paper Co Process for producing fibrous filler having high wet end retention
US3597312A (en) * 1969-05-07 1971-08-03 Westvaco Corp Synthetic fibrous filler and paper containing the filler
BE755820A (fr) * 1969-09-12 1971-03-08 Sandoz Sa Composition de blanchiment optique
US3871898A (en) * 1969-11-14 1975-03-18 Ciba Geigy Ag Process for the optical brightening of organic fibre material
US3775353A (en) * 1971-11-05 1973-11-27 Westvaco Corp Blushed polystyrene pigment
DE2420473A1 (de) * 1974-04-27 1975-12-11 Bayer Ag Weisstoenen von polyesterfasern
US3983288A (en) * 1974-11-04 1976-09-28 Eastman Kodak Company Fibers and fabrics containing optical brightening agents
DE2500915C3 (de) * 1975-01-11 1980-09-18 Bayer Ag, 5090 Leverkusen Verfahren zum Weißtönen von Textilfasem aus Polyestern oder Mischfasern aus Polyestern und Cellulose oder Wolle
US4095939A (en) * 1977-05-09 1978-06-20 Eastman Kodak Company Optically brightened polyesters with 2,5-bis-(p-carboalkylstyryl)-oxadiazole
US4460647A (en) * 1982-09-13 1984-07-17 Celanese Corporation Fibrets suitable for paper opacification
US4859539A (en) * 1987-03-23 1989-08-22 Eastman Kodak Company Optically brightened polyolefin coated paper support
DE3868462D1 (de) * 1987-08-26 1992-03-26 Ciba Geigy Ag Dispersionsaufheller-praeparate.
US5213883A (en) * 1991-05-14 1993-05-25 The Mead Corporation Decor sheet containing fibrets
DE4230655A1 (de) * 1992-09-14 1994-03-17 Ciba Geigy Verfahren zur Verbesserung von Weißgrad, Helligkeit und Farbort von Faserstoffen
DE19500195A1 (de) * 1995-01-05 1996-07-11 Bayer Ag Verwendung weißgetönter Kunststoffe zum Weißtönen von Papierstreichmassen und derart weißgetönte Papierstreichmassen
US5759349A (en) * 1995-12-14 1998-06-02 Westvaco Corporation Lumen loading of hygienic end use paper fibers
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
DE10114696A1 (de) * 2001-03-23 2002-11-07 Clariant Gmbh Verfahren zur Herstellung von optisch aufgehelltem Polyester
US6893473B2 (en) * 2002-05-07 2005-05-17 Weyerhaeuser.Company Whitened fluff pulp
DE10237186A1 (de) * 2002-08-14 2004-03-18 Clariant Gmbh Verfahren zum Aufhellen synthetischer Fasern und Kunstoffe mit granulierten optischen Aufhellern
US6818367B2 (en) * 2003-04-15 2004-11-16 Eastman Kodak Company Support with reduced optical brightener migration
US20040260034A1 (en) * 2003-06-19 2004-12-23 Haile William Alston Water-dispersible fibers and fibrous articles
DE102004011957A1 (de) * 2004-03-11 2005-09-29 Basf Ag Verfahren zum optischen Aufhellen von synthetischen Fasern oder von synthetischen Fasern in Mischung mit natürlichen Fasern
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
US7622022B2 (en) * 2006-06-01 2009-11-24 Benny J Skaggs Surface treatment of substrate or paper/paperboard products using optical brightening agent

Also Published As

Publication number Publication date
NO20083311L (no) 2008-10-27
ZA200806504B (en) 2009-11-25
ATE434083T1 (de) 2009-07-15
AR059215A1 (es) 2008-03-19
TW200738936A (en) 2007-10-16
DE602006007388D1 (de) 2009-07-30
EP1982017B1 (en) 2009-06-17
WO2007085337A1 (en) 2007-08-02
US20100230061A1 (en) 2010-09-16
EP1982017A1 (en) 2008-10-22
IL192985A0 (en) 2009-02-11
JP2009524747A (ja) 2009-07-02
CA2636234A1 (en) 2007-08-02
BRPI0621286A2 (pt) 2011-12-06
AU2006336948A1 (en) 2007-08-02
RU2008134714A (ru) 2010-03-10
KR20080095862A (ko) 2008-10-29

Similar Documents

Publication Publication Date Title
EP0561828B1 (en) Paper and a method of paper manufacture
JP4550419B2 (ja) 蛍光増白剤に関する改良
AU2006235427B2 (en) Improved composition and processes for paper production
US8246780B2 (en) Methods for enhancing brightness and resistance to thermal yellowing of bleached kraft pulp and paper
CA2910585C (en) Use of micronized cellulose and fluorescent whitening agent for surface treatment of cellulosic materials
EP2534301B1 (en) Aqueous sizing compositions for shading in size press applications
CN101932567B (zh) 荧光增白剂的储存稳定的溶液
CN101365843A (zh) 制备光学增亮纸的方法
CA2713268A1 (en) A method for production of paper
JP5365898B2 (ja) 新聞用紙の製造方法及び新聞用紙
KR20200102995A (ko) 종이를 백색화하기 위한 광증백제
CN109311826A (zh) 荧光增白剂及其混合物

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
REG Reference to a national code

Ref country code: HK

Ref legal event code: DE

Ref document number: 1128942

Country of ref document: HK

C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication

Open date: 20090211

REG Reference to a national code

Ref country code: HK

Ref legal event code: WD

Ref document number: 1128942

Country of ref document: HK