EP1853762B1 - Hydroxyalkylcellulose utilisee en tant qu additif dans des revetements pigmentes pour presse encolleuse doseuse - Google Patents

Hydroxyalkylcellulose utilisee en tant qu additif dans des revetements pigmentes pour presse encolleuse doseuse Download PDF

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Publication number
EP1853762B1
EP1853762B1 EP05724378A EP05724378A EP1853762B1 EP 1853762 B1 EP1853762 B1 EP 1853762B1 EP 05724378 A EP05724378 A EP 05724378A EP 05724378 A EP05724378 A EP 05724378A EP 1853762 B1 EP1853762 B1 EP 1853762B1
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EP
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Prior art keywords
pigmented
coating
hac
ahac
carbons
Prior art date
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EP05724378A
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German (de)
English (en)
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EP1853762A1 (fr
Inventor
Charles L. Burdick
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Hercules LLC
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Hercules LLC
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Publication date
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Publication of EP1853762A1 publication Critical patent/EP1853762A1/fr
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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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/52—Cellulose; Derivatives thereof
    • 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
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls

Definitions

  • the present invention relates to a process for preparing coated paper wherein the coating is applied by a roller or set of rollers as a film layer to a moving paper substrate. More specifically, this invention relates to the adding of a specific type of rheology modifier to a paper coating to enhance the film transfer process so as to effect improved coated paper properties.
  • rheology modifiers it is desired in various industries to use rheology modifiers to achieve thickening, flow control, water retention and other properties in aqueous systems.
  • a number of rheology modifiers are commercially available, such as sodium carboxymethylcellulose (CMC), guar gum, sodium alginate, hydroxyethylcellulose (HEC), alkali-soluble lattices, starch or starch derivatives, and the like.
  • Paper coatings are typically composed of a pigment, such as kaolin clay and calcium carbonate, binders, such as starch and styrene butadiene latex, water, various specialty additives, and at least one of the above mentioned rheology modifiers
  • CMC is established as one of the most prevalent rheology modifiers for traditional blade metered paper-coating application.
  • a new method of applying aqueous pigment containing paper coatings onto the surface of paper has been devised that is known as "pigmented metering size press” or sometimes “film transfer coating”.
  • a wet coating is first metered onto a roller that is typically composed of stainless steel or synthetic substrate.
  • the wet coating film layer is then transferred by contact to a moving web of paper. Typically this operation is performed on both sides of the paper simultaneously.
  • EP 1467022 relates to a method for producing coated paper by applying a coating color which contains a pigment, and adhesive and polyvinyl alcohol.
  • a coating color which contains a pigment
  • adhesive and polyvinyl alcohol As the adhesive, cellulose derivatives such as carboxymethylcellulose, hydroxymethylcellulose or hydroxyethylcellulose may be used.
  • Khim. Teknol. Bumagi, no. 1, 1973, pages 19-23 (Burova, T. et al.), describes the use of modified hydroxyethylcellulose in coating suspensions, wherein the viscosity of the hydroxyethylcellulose is reduced by treatment with hypochlorite.
  • the coating suspensions contain 2-19 parts of hydroxyethylcellulose per 100 parts of pigment (kaolin and blanc fixe).
  • the present invention is directed to a process for preparing coated paper comprising a) adding a water-soluble hydroxyalkylcellulose (HAC) with an alkyl moiety of 1 to 4 carbons, or water soluble alkylhydroxyalkylcellulose (AHAC) with an alkyl hydrophobe of 1 to 24 carbons to a wet coating formulation in an amount of 0.05-0.8 parts HAC or AHAC based on 100 parts of pigment content of the coating and b) applying the pigmented wet coating formulation to a moving paper web via roller metering (film transfer) size press.
  • HAC or AHAC water soluble alkylhydroxyalkylcellulose
  • AHAC water soluble alkylhydroxyalkylcellulose
  • HEC hydroxyalkylcellulose
  • HEC hydroxyethylcellulose
  • BHEC hydroxybutylcellulose
  • AHAC alkylhydroxyalkylcellulose
  • MHEC methylhydroxyethylcellulose
  • EHEC ethylhydroxyethylcellulose
  • HHEC hydrophobically modified hydroxyethylcellulose
  • This invention has advantages in preventing the misting that has been traditionally observed in the prior art pigmented metering size press operations.
  • the present invention has unexpectedly been found to produce a balance of additional performance properties, such as enhanced fiber coverage, opacity, and brightness that are significantly useful for the end product of the metering size press application.
  • the cellulose ethers operable in the present invention include all water soluble nonionic derivatives of cellulose containing hydroxyethyl functionality and that express aqueous solution viscosities in excess of 100 centipoise at a concentration of 5% in water.
  • the water-soluble polymer may also in addition to hydroxyethyl functionality also be derivatized with other substituents such as a methyl group, butyl group, or longer hydrophobes having up to 24 carbon atoms.
  • any one of these types of water-soluble polymers are employed as a rheology modifier in a pigmented metering size press paper coatings they would be dosed into the coating at a ievei to attain a runnable coating viscosity typically of 100-4000 cps.
  • the dosage of rheology modifier employed in practice is 0.05-0.8 or typically 0.2-0.8 parts of rheology modifier based upon 100 parts of pigment in the coating. It is reasonable to suggest that a range of 0.05 to 0.8 parts of the rheology modifier of the present invention could be effective for conveying desirable runnability features to pigmented metering size press coatings.
  • a typical coating formulation would contain about 100 parts pigment, about 10 to about 18 parts binder (i.e., starch and/or latex), about 20 to about 60 % solids.
  • binder i.e., starch and/or latex
  • the solids content can be 50 to 60 %.
  • the HAC or AHAC content in this composition is 0.2 to 0.8 part, which is included in the solids percentage.
  • binder that is used in this composition is starch and latex (which can be styrene or vinyl based).
  • the pigment in this composition are calcium carbonate and kaolin clay.
  • paper coatings were prepared with identical pigments, binders, and other additives, at equal percent solids, then thickened to a constant viscosity target range by means of various rheology modifiers, including hydroxyethylcellulose and sodium carboxymethylcellulose of different molecular weights. These various coating samples were then, in turn, applied in successive tests to a paper substrate by means of a high-speed film press pilot apparatus. Variable speeds were used to surface coat the paper in these tests so that comparisons of runnability and coated paper properties could be assessed. Monitoring the nip exit of the metering size press apparatus assessed misting tendency of each coating test.
  • ADMIRAL® 3089FS fluid polymer suspension FPS
  • ADMIRAL® 3089FS FPS fluid polymer suspension
  • hydroxyethylcellulose into the pigmented metering size press trial process produces unexpected valuable runnability performance. It is, therefore, reasonable to expect that nonionic cellulose derivatives that are similar to HEC would also show this same performance, if included into the metering size press application. These latter materials are thought to include water-soluble alkylhydroxyethylcellulose derivatives in general and methylhydroxyethylcellulose (MHEC) ethylhydroxyethylcellulose, (EHEC) and hydrophobically-modified hydroxyethylcellulose (HMHEC) in particular.
  • MHEC methylhydroxyethylcellulose
  • EHEC ethylhydroxyethylcellulose
  • HHEC hydrophobically-modified hydroxyethylcellulose

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  • Paper (AREA)

Claims (11)

  1. Procédé de préparation de papier couché, comprenant
    a) l'addition d'une hydroxyalkylcellulose (HAC) hydrosoluble comportant une fraction alkyle contenant de 1 à 4 atomes de carbone, ou d'une alkylhydroxyalkylcellulose (AHAC) hydrosoluble comportant un groupe alkyle hydrophobe contenant de 1 à 24 atomes de carbone, à une formulation de couchage humide contenant un pigment dans une quantité de 0,05 à 0,8 partie de HAC ou d'AHAC pour 100 parties de pigment présentes dans le couchage et
    b) l'application de la formulation de couchage humide contenant un pigment sur une bande de papier en mouvement par l'intermédiaire d'une coucheuse à rouleaux de dosage.
  2. Procédé selon la revendication 1, dans lequel le groupe alkyle dans l'hydroxyalkylcellulose hydrosoluble contient de 2 à 3 atomes de carbone.
  3. Procédé selon la revendication 1, dans lequel la HAC ou l'AHAC est sélectionnée dans le groupe constitué de l'hydroxyéthylcellulose et de la n-butylhydroxy-éthylcellulose.
  4. Procédé selon la revendication 1, dans lequel le groupe alkyle dans la partie hydrophobe de l'alkylhydroxyalkylcellulose hydrosoluble contient de 8 à 18 atomes de carbone.
  5. Procédé selon la revendication 1, dans lequel l'alkylhydroxyalkylcellulose est sélectionnée dans le groupe constitué de la méthylhydroxyéthylcellulose (MHEC), de l'éthylhydroxyéthylcellulose (EHEC), et de l'hydroxyéthylcellulose modifiée hydrophobiquement (HMHEC) comportant une partie hydrophobe contenant de 1 à 24 atomes de carbone.
  6. Procédé selon la revendication 5, dans lequel l'hydroxyéthylcellulose modifiée hydrophobiquement comporte une partie hydrophobe contenant de 10 à 16 atomes de carbone.
  7. Procédé selon la revendication 1, dans lequel le pigment est sélectionné dans le groupe constitué du carbonate de calcium et de l'argile kaolin.
  8. Procédé selon la revendication 1, dans lequel la formulation de couchage humide contenant un pigment contient 100 parties de pigment, de 10 à 18 parties de liant, de 0,2 à 0,8 partie de HAC ou d'AHAC, de 20 à 60 % de solides relativement au poids total du liant et du pigment.
  9. Procédé selon la revendication 8, dans lequel la teneur en solides est de 50 à 60 % en poids.
  10. Procédé selon la revendication 8, dans lequel le liant est de l'amidon ou un latex.
  11. Procédé selon la revendication 10, dans lequel le latex est à base de styrène.
EP05724378A 2005-03-02 2005-03-02 Hydroxyalkylcellulose utilisee en tant qu additif dans des revetements pigmentes pour presse encolleuse doseuse Active EP1853762B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2005/006819 WO2006093497A1 (fr) 2005-03-02 2005-03-02 Hydroxyalkylcellulose utilisee en tant qu’additif dans des revetements pigmentes pour presse encolleuse doseuse

Publications (2)

Publication Number Publication Date
EP1853762A1 EP1853762A1 (fr) 2007-11-14
EP1853762B1 true EP1853762B1 (fr) 2011-05-11

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EP05724378A Active EP1853762B1 (fr) 2005-03-02 2005-03-02 Hydroxyalkylcellulose utilisee en tant qu additif dans des revetements pigmentes pour presse encolleuse doseuse

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EP (1) EP1853762B1 (fr)
AT (1) ATE509157T1 (fr)
CA (1) CA2599883A1 (fr)
ES (1) ES2363016T3 (fr)
WO (1) WO2006093497A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102027053B (zh) * 2008-03-15 2014-06-04 赫尔克里士公司 粘土浆料及其在制浆和造纸应用中的用途
ITVA20090013A1 (it) 2009-02-17 2010-08-18 Lamberti Spa Sospensioni acquose per la patinatura della carta

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5494509A (en) * 1993-10-29 1996-02-27 Aqualon Company Paper coating composition with increased thickener efficiency
AU2003203172A1 (en) * 2002-01-16 2003-07-30 Nippon Paper Industries Co., Ltd. Method for producing coated paper for printing

Also Published As

Publication number Publication date
CA2599883A1 (fr) 2006-09-08
ATE509157T1 (de) 2011-05-15
ES2363016T3 (es) 2011-07-18
EP1853762A1 (fr) 2007-11-14
WO2006093497A1 (fr) 2006-09-08

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