EP0343007B2 - Paper coating composition - Google Patents

Paper coating composition Download PDF

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Publication number
EP0343007B2
EP0343007B2 EP89305102A EP89305102A EP0343007B2 EP 0343007 B2 EP0343007 B2 EP 0343007B2 EP 89305102 A EP89305102 A EP 89305102A EP 89305102 A EP89305102 A EP 89305102A EP 0343007 B2 EP0343007 B2 EP 0343007B2
Authority
EP
European Patent Office
Prior art keywords
coating composition
copolymers
composition according
acid
additive
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.)
Expired - Lifetime
Application number
EP89305102A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0343007B1 (en
EP0343007A2 (en
EP0343007A3 (en
Inventor
Susumu Mitsui
Kenji Tsunekawa
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.)
Somar Corp
Original Assignee
Somar Corp
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
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Application filed by Somar Corp filed Critical Somar Corp
Publication of EP0343007A2 publication Critical patent/EP0343007A2/en
Publication of EP0343007A3 publication Critical patent/EP0343007A3/en
Publication of EP0343007B1 publication Critical patent/EP0343007B1/en
Application granted granted Critical
Publication of EP0343007B2 publication Critical patent/EP0343007B2/en
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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
    • 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
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof

Definitions

  • This invention relates generally to a paper coating composition to be used for the production of coated papers and, more specifically, to an aqueous coating composition to be applied over the surface of a paper for improving its surface properties such as surface smoothness, gloss and printability.
  • the present invention is also directed to a coated paper having a surface coated layer obtained from the above coating composition.
  • DE-A-3603392 discloses the use of polymers of acrylic acid or methacrylic acid as milling aids and dispersants for eg white pigments such of as titanium dioxide and kaolin for producing aqueous pigment slurries for paper-making compositions.
  • One known coating composition includes a white pigment such as kaolin, a binder, a latex and a dispersing agent.
  • a white pigment such as kaolin
  • a binder such as kaolin
  • a latex such as kaolin
  • a dispersing agent such as sodium alginate or carboxymethylcellulose.
  • an aqueous coating composition comprising:
  • the present invention provides a coated paper obtained by coating the above composition over the surface of a paper.
  • the paper coating composition according to the present invention is characterized by the inclusion of a specific additive, i.e. an acrylic acid/methacrylic acid copolymer and/or a copolymer (a) acrylic acid or methacrylic acid and (b) an alkyl acrylate or alkyl methacrylate, together with glycerin.
  • a specific additive i.e. an acrylic acid/methacrylic acid copolymer and/or a copolymer (a) acrylic acid or methacrylic acid and (b) an alkyl acrylate or alkyl methacrylate, together with glycerin.
  • the alkyl group of the monomer (b), i.e. alkyl acrylate or methacrylate has 2-4 carbon atoms.
  • the additive preferably has an average molecular weight of 5,000 to 500,000. It is important that the additive should be present in an amount of 0.001 to 2 %, preferably 0.01 to 1 % based on the weight of the white
  • the acrylic acid/methacrylic acid copolymer preferably has a molar ratio of the former acid to the latter acid of 9:1 to 3:2, more preferably 4:1 to 13:7 and an average molecular weight of 10,000 to 100,000.
  • the copolymer of the acid (a) and the ester (b) preferably has a molar ratio of the acid (a) to the ester (b) of in the range of 19:1 to 1:1, more preferably 4:1 to 3:2, and an average molecular weight of 60,000 to 300,000.
  • the use of the specific copolymer additive has the effect of imparting excellent water-retentivity, viscosity and fluidity properties to the composition and these properties are further improved by the use in conjunction with the copolymer additive of the polyol, whereby the coating composition of the present invention can give coated paper having excellent properties such as printability and gloss.
  • the glycerin is preferably used in an amount of 1-20%, more preferably 5-15% based on the weight of the copolymer.
  • any known white pigment conventionally used for a paper coating composition may be used in the present invention.
  • suitable pigments are clay, calcium carbonate, kaolin, talc, titanium oxide, aluminum hydroxide, silica, zinc oxide, activated terra alba, acid terra alba, lake, diatomaceous earth, plastic pigments and mixture thereof.
  • the content of the white pigment in the coating composition is generally 40-70% by weight.
  • the binder there may be used a latex or a solution of synthetic or natural high molecular weight polymers.
  • suitable polymers to be used as the binder are styrene/butadiene copolymers, styrene/acryl copolymers, vinyl acetate/acryl copolymers, ethylene/vinyl acetate copolymers, butadiene/methyl methacrylate copolymers, vinyl acetate/butyl acrylate copolymers, styrene/maleic anhydride copolymers, isobutene/maleic anhydride copolymers, acrylic acid/methylmethacrylate copolymers, water-soluble starch, casein and soy bean protein.
  • the content of the binder is preferably 3 to 30%, more preferably 7 to 20% based on the weight of the pigment.
  • the coating composition according to the present invention preferably also contains a dispersing agent such as sodium polyacrylate, sodium hexametaphosphate or sodium pyrophosphate.
  • a dispersing agent such as sodium polyacrylate, sodium hexametaphosphate or sodium pyrophosphate.
  • the coating composition according to the present invention is suitably applied over one or both sides of a paper such as a wood-free paper, a ground wood paper or a paper board to give a coated paper.
  • Coating may be effected in a manner known per se using, for example, a blade coater, a roll coater, an air knife coater or a short dwell coater.
  • a coating liquid having the following composition was prepared:
  • a coating liquid was obtained by replacing the additive of Comparative Example 1 with a methacrylic acid/butyl acrylate copolymer (manufactured by Rohm & Haas, referred to as Copolymer B).
  • a coating liquid was obtained by replacing the additive of Comparative Example 1 with a mixture of 10 parts by weight of the methacrylic acid/ethyl acrylate copolymer (Copolymer A) with 1 part by weight of glycerin.
  • a coating liquid was obtained by replacing the additive of Comparative Example 1 with a mixture of 10 parts by weight of the methacrylic acid/butyl acrylate copolymer (Copolymer B) with 1 part by weight of glycerin.
  • a coating liquid was obtained by replacing the additive of Example 1 with a mixture of 10 parts by weight of an acrylic acid/methacrylic acid copolymer (Copolymer C, average molecular weight: 70,000) with 1 part by weight of glycerin.
  • a coating liquid was obtained by replacing Copolymer C of Example 3 with ari acrylic acid/methacrylic acid copolymer (Copolymer D, average molecular weight: 40,000).
  • a coating liquid was obtained by replacing the additive of Comparative Example 1 with carboxymethylcellulose (CMC).
  • a coating liquid was obtained by replacing the additive of Comparative Example 1 with sodium alginate. Comparative Example 5
  • a coating liquid was obtained by replacing the additive of Comparative Example 1 with water.
  • Fluidity (viscosity of the coating composition) / (viscosity of the aqueous phase of the coating composition * ) *: The composition is first separated into a liquid (aqueous) phase and a solid phase by centrifugation. Then, the viscosity of the liquid phase is measured.
  • Each of the above coating liquids was applied over one side of a paper having a basis weight of 60 g/m 2 and then dried to obtain a coated paper having a basis weight of 75 g/m 2 .
  • coated papers were tested for their gloss, brightness, smoothness and resistance to picking in the following manner:
  • Dry pick and wet pick were measured using a printability tester (RI tester manufactured by Akira Seisakusho K.K.) and evaluated in terms of 5-level rating (greater, the better).
  • RI tester manufactured by Akira Seisakusho K.K.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Paints Or Removers (AREA)
EP89305102A 1988-05-20 1989-05-19 Paper coating composition Expired - Lifetime EP0343007B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP123387/88 1988-05-20
JP12338788 1988-05-20

Publications (4)

Publication Number Publication Date
EP0343007A2 EP0343007A2 (en) 1989-11-23
EP0343007A3 EP0343007A3 (en) 1991-02-27
EP0343007B1 EP0343007B1 (en) 1993-12-15
EP0343007B2 true EP0343007B2 (en) 1997-06-18

Family

ID=14859316

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89305102A Expired - Lifetime EP0343007B2 (en) 1988-05-20 1989-05-19 Paper coating composition

Country Status (6)

Country Link
EP (1) EP0343007B2 (ja)
JP (1) JPH0253996A (ja)
AU (1) AU619007B2 (ja)
DE (1) DE68911372T3 (ja)
FI (1) FI95299C (ja)
NO (1) NO174820B (ja)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5034062A (en) * 1990-08-23 1991-07-23 Rohm And Haas Company Use of acid-containing anionic emulsion copolymers as calcined clay slurry stabilizers
KR100357654B1 (ko) * 1994-12-30 2003-02-05 주식회사 엘지씨아이 종이코팅용조성물
JP4139872B2 (ja) * 2003-03-05 2008-08-27 サンノプコ株式会社 ラテックス用減粘剤
US20100010153A1 (en) * 2007-02-08 2010-01-14 Basf Se Water-soluble binders for paper coating slips
ITUB20150502A1 (it) * 2015-05-11 2016-11-11 Colorificio Valdecia Di Gelpi Claudio Gerardo Composizioni liquide per il rivestimento di superfici trasparenti

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US870994A (en) * 1905-12-08 1907-11-12 Rockstroh Mfg Company Printing-plate holder.
US3945843A (en) * 1974-07-22 1976-03-23 Nalco Chemical Company Acrylic acid copolymer as pigment dispersant
US4138381A (en) * 1975-04-14 1979-02-06 E. I. Du Pont De Nemours And Company Polymeric thickeners, processes for their preparation and uses thereof
JPS59230632A (ja) * 1983-06-15 1984-12-25 Kindai Kagaku Kogyo Kk 高級脂肪酸金属塩の水性分散液の製造方法
US4567099A (en) * 1984-12-21 1986-01-28 The Dow Chemical Company High solids latexes for paper coatings
DE3603392A1 (de) * 1986-02-05 1987-08-06 Basf Ag Verfahren zur herstellung von polymerisaten der acrylsaeure oder methacrylsaeure
FR2603042B1 (fr) * 1986-08-22 1988-11-10 Coatex Sa Compositions pigmentaires complexes pour l'enduction du papier

Also Published As

Publication number Publication date
NO174820C (ja) 1994-07-13
DE68911372T3 (de) 1998-01-08
EP0343007B1 (en) 1993-12-15
DE68911372D1 (de) 1994-01-27
FI892413A0 (fi) 1989-05-19
NO174820B (no) 1994-04-05
NO892023L (no) 1989-11-21
FI95299C (fi) 1996-01-10
JPH0253996A (ja) 1990-02-22
AU3503089A (en) 1989-11-23
EP0343007A2 (en) 1989-11-23
AU619007B2 (en) 1992-01-16
DE68911372T2 (de) 1994-06-01
EP0343007A3 (en) 1991-02-27
NO892023D0 (no) 1989-05-19
JPH049238B2 (ja) 1992-02-19
FI95299B (fi) 1995-09-29
FI892413A (fi) 1989-11-21

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