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EP1381735A1 - Nouvelle composition de couleur pour revetement - Google Patents

Nouvelle composition de couleur pour revetement

Info

Publication number
EP1381735A1
EP1381735A1 EP02714250A EP02714250A EP1381735A1 EP 1381735 A1 EP1381735 A1 EP 1381735A1 EP 02714250 A EP02714250 A EP 02714250A EP 02714250 A EP02714250 A EP 02714250A EP 1381735 A1 EP1381735 A1 EP 1381735A1
Authority
EP
European Patent Office
Prior art keywords
parts
starch
latex
coating
composition according
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.)
Withdrawn
Application number
EP02714250A
Other languages
German (de)
English (en)
Inventor
Anna-Liisa Tammi
Päivi MIETTINEN
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.)
BASF Schweiz AG
Original Assignee
Raisio Chemicals Oy
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 Raisio Chemicals Oy filed Critical Raisio Chemicals Oy
Publication of EP1381735A1 publication Critical patent/EP1381735A1/fr
Withdrawn legal-status Critical Current

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
    • 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
    • D21H19/54—Starch
    • 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
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—Oxides, hydroxides or carbonates
    • 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

  • the present invention relates to coating of paper and paperboard and is especially directed to a novel pigment coating composition for coating of paper and paper- board.
  • the novel coating composition comprises pigment, latex, a small amount of a polymer which is made of hydrophobic monomers in the presence of starch, optionally also other binders and, if necessary, known additives used in coating compositions.
  • the invention is also directed to paper or paperboard coated with the novel coating composition and by all coating methods.
  • the purpose of coating is to improve the surface properties of paper or paperboard, such as gloss, smoothness and printability.
  • the most commonly used surface treatment is pigment coating, wherein color, in other words pigment-binder mixture, is applied on the surface of base material at a coating unit or at a separate coating machine, the thickness of the coating layer is adjusted, and finally the coating is dried.
  • a usual pigment coating mixture comprises pigment agents, of which there may be one or several present, binder or binders, water, and optionally additives, such as hardeners, viscosity and water retention regulating agents and lubricants.
  • the ratios of the coating mixture components can vary rather widely, depending on the purpose of use and quality requirements of the end product, on the coating method and on the quality of the base paper.
  • US patent No. 5,536,764 discloses a coating composition, which comprises a starch-polymer dispersion formed in the reaction of cationic starch and vinyl ace- tate. According to the publication the polymer dispersion is intended to replace protein, which is used as a binder in a board coating composition.
  • the starch- polymer dispersion has been used in large amounts (7.2 parts), in addition to which latex (11.4 parts) has been used as a co-binder.
  • the dry solids content of the coating composition is low (48%).
  • US patent No. 5,003,022 discloses a polymer dispersion, which comprises a graft polymer formed in the reaction of starch and vinyl monomers.
  • the dispersion is said to be suitable for use as a binder in a coating color composition, wherein it was used either as the only binder or as a co-binder with latex.
  • the proportion of polymer dispersion was high (6 or 10 parts, when the proportion of pigment was 77 or 90 parts, respectively).
  • an essential component of the pigment coating mixture is the pigment.
  • coating pigments La. kaolin, calcinated kaolin, calcium carbonate, titanium dioxide, satine white, talc, gypsum, chalk, aluminium hydroxide, barium sulphate and sodium aluminium silicate, of which the most commonly used are kaolin, calcinated kaolin, talc and calcium carbonate.
  • Pig- 0 ments which contain calcium provide the end product with high brightness, and that is the reason why they are often desired to be used.
  • a problem with coating colors, which comprise calcium-containing pigment is dusting at the printing stage and a low gloss of the printed surface.
  • novel coating color composition according to the invention which comprises in o addition to latex as a binder a small amount of a polymer made of hydrophobic monomers in the presence of starch, surprisingly binds calcium-containing pig- ments extremely well and its dry solids content is sufficiently high from the point of view of the success of the coating process. Further, its price is advantageous, as only a small amount of the expensive starch-stabilized latex is needed.
  • the composition according to the invention is also especially suitable for coating that is based on spray technique.
  • the present invention is directed to a novel coating color composition, which comprises as its components a) pigment, b) latex, c) if necessary, known additives used in coating compositions, and d) a small amount of a polymer made of hydrophobic monomers in the presence of starch, in other words starch- stabilized latex.
  • a preferred coating color composition according to the invention contains no more than 5 parts, preferably no more than 3 parts, of starch-stabilized latex.
  • the coating color composition according to the invention may contain also other binders than latex and starch-stabilized latex, such as for exam- pie starch and/or CMC. The amount of these may be 0 - 7 parts, preferably 0.5 - 3 parts.
  • the proportions of the components are usually calculated so that the total amount of pigments is marked as 100 and the amounts of the other components are given as relative to the amount of the total pigment.
  • the proportions of all components are given as dry parts.
  • the amounts of the components of the coating composition according to the invention are given as described above.
  • Suitable pigments for a coating color composition according to the invention are coating pigments known in the art, such as kaolin, calcinated kaolin, gypsum, chalk, calcium carbonate, titanium dioxide, satine white, talc, aluminium hydroxide, barium sulphate and sodium aluminium silicate.
  • Especially suitable for a coating color composition according to the invention are all calcium-containing pig- ments, such as calcinated kaolin, gypsum, calcium carbonate (ground or precipitated).
  • Suitable binders are latexes known in the art, such as styrene butadiene latex (SB), acrylate latexes and polyvinyl acetate latexes (PNAc), especially SB latexes.
  • a coating color composition according to the invention is characterized in that it in addition to latex contains a small amount of starch-stabilized latex.
  • other binders such as for example starch and/or CMC, may be used.
  • La. dispersants agents which change flow properties, antifoam and foam-removing agents, preservatives, lubricants, hardeners, and optical brighteners. These are often added to coating mixtures in order to improve the use properties of the coating mixture or in order to provide the coating with certain special features.
  • starch-stabilized latex means a copolymer, which is formed when hydrophobic vinyl monomers are polymerized in the pres- ence of native or modified starch.
  • Modified starch can mean for example degraded (for example oxidized), anionized, cationized, and/or amphoteric starch.
  • Starch may be any of the known starches, such as potato, corn, waxy corn, barley, wheat, or tapioca starch, preferably potato starch.
  • starch In the place of starch also any other poly- saccharide, which contains a free hydroxyl group, such as amylose, amylopectine, carrageen, cellulose, chitosan, chitin, dextrines, guar gum (guarane) and other ga- lactomannans, arabic gum, hemicellulose components, and pullulan, can be used, but starch is the most preferred polysaccharide for the purposes of the invention. Processes for the preparation of starch-polymer dispersions have been disclosed for example in the publications US 4,301,017, US 5,003,022 and WO 00/46264.
  • Monomers used in the preparation of a suitable polymer that is included in the coating composition according to the invention are hydrophobic monomers, such as for example styrene, alpha-methyl styrene, acrylates, acrylonitrile etc.
  • a preferred coating color composition according to the invention comprises a) 100 parts of pigment, b) 8 - 18 parts of latex, c) 0 - 3 parts of additives and d) 0.1 - 5 parts of starch-stabilized latex. More preferably, the amount of latex is 8 - 15 parts, even more preferably 9 - 14 parts, and most preferably 11 - 12 parts.
  • the amount of additives is preferably 0.2 - 2 parts, more preferably 0.2 - 1.5 parts, for example about 1 part.
  • the amount of a polymer made of hydrophobic monomers in the presence of starch is 0.1 - 5 parts, more preferably 0.2 - 4 parts, even more preferably 0.3 - 3 parts, and most preferably about 0.5 - 1.5 parts.
  • a preferred coating color composition according to the invention which comprises also another binder than latex and starch-stabilized latex, contains a) 100 parts of pigment, b) 9 - 14 parts of latex, c) 0.2 - 1.5 parts of additives and d) 0.3 - 3 parts of a polymer made of hydrophobic monomers in the presence of starch, and e) 0.5 - 3 parts of starch.
  • An even more preferred coating color composition according to the invention which comprises also another binder than latex and starch-stabilized latex, contains a) 100 parts of pigment, b) 10 - 12 parts of latex, c) 0.5 - 1.5 parts of additives, d) 0.5 - 1.5 parts of a polymer made of hydrophobic monomers in the presence of starch, and e) 1 - 2 parts of starch.
  • a preferred coating color composition according to the invention comprises a) 100 parts of pigment, b) 12 parts of latex, c) 1 part of additives, d) 1 part of starch- stabilized latex, e) 1 part of plain starch.
  • An even more preferred coating color composition according to the invention comprises a) 100 parts of pigment, b) 11 parts of latex, c) 1 part of additives, d) 1 part of starch-stabilized latex, e) 2 parts of plain starch.
  • the dry solids content of a ready-for-use coating color composition according to the invention is usually over 50%, for example 50 to 60%, preferably about 55%, and at its most about 62%.
  • the coating color composition according to the invention Due to the coating color composition according to the invention, pigment, especially calcium-containing pigment, binds better to the base paper or paperboard. Consequently, the dusting problem of especially such coating colors, which comprise calcium-containing pigment, can be avoided. At the same time also the surface of the coated paper becomes more dense, and the surface strengths and the 0 gloss and other properties of the printed surface are improved. The colour setting profile is also changed, which is advantageous in certain applications.
  • the coating color composition according to the invention contains a smaller amount of the expensive starch-stabilized latex than the prior known products, and its price is thus more advantageous. In the coating color compositions according to the invention 5 also the amount of latex can in certain applications be reduced due to the higher surface strengths.
  • Examples 1 to 7 describe different coating color compositions, of which the compositions of examples 2 to 7 are com- o positions according to the invention.
  • Examples 8 to 9 present the test results obtained.
  • the color according to the invention was prepared by first mixing the basic color as in Example 1.
  • the boiled starch and starch-stabilized latex were slurried with the basic color.
  • the color according to the invention was prepared by first mixing the basic color as in Example 1.
  • the starch-stabilized latex was slurried with the basic color.
  • the color according to the invention was prepared by first mixing the basic color as in Example 1.
  • the starch-stabilized latex was slurried with the basic color.
  • the color according to the invention was prepared by first mixing the basic color as in Example 1.
  • the starch-stabilized latex was slurried with the basic color.
  • the color according to the invention was prepared by first mixing the basic color as 5 in Example 1. The boiled starch and starch-stabilized latex were slurried with the basic color.
  • the base paper was coated with different colors with a pilot-scale coating apparatus. Both sides a and b of the paper were coated.
  • the papers were printed in a laboratory scale.
  • Figure 1 shows the results that were obtained when the amount of organic compo- 5 nents, i.e. binders, was measured from a sample taken after coating unit from a wet, coated paper.
  • the amount of organic components represents the amount of binder, which is applied from the coating. A higher amount of organic components shows that the pigment is better bound to the paper.
  • Figure 1 The amount of organic components measured from a wet paper coating
  • Test color 1 composition according to the invention, which contains
  • the starch-stabilized latex 1 is an anionic latex stabilized with anionic starch.
  • Test color 2 composition according to the invention, which contains 100 parts of carbonate 13 parts of SB latex
  • the starch-stabilized latex 2 is an amphoteric latex stabilized with cationic starch.
  • Table 1 shows the measurements from papers coated with different coating color compositions. All the papers had the same base paper. The reference and test colors 1 and 2 were the same as in Example 8.
  • the improvement in the surface strength of the papers coated with the colors according to the invention is shown both as a better picking strength and as better delamination strength of the coating, when measured with an IGT apparatus.
  • the improvement in the properties of the printed surface is shown by the clear improvement of the gloss of the printed surface and especially by the clear improvement of the gloss contrast (delta gloss) of the paper.

Landscapes

  • Paper (AREA)

Abstract

L'invention porte sur un revêtement de papier et de carton et plus précisément sur une nouvelle composition de revêtement à pigment destinée à revêtir du papier ou du carton. La nouvelle composition de revêtement contient un pigment, du latex, une petite quantité de polymère à base de monomères hydrophobes en présence d'amidon, et éventuellement d'autres liants et, si nécessaire, des additifs connus utilisés dans les compositions de revêtement.
EP02714250A 2001-04-12 2002-04-12 Nouvelle composition de couleur pour revetement Withdrawn EP1381735A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20010773 2001-04-12
FI20010773A FI116536B (fi) 2001-04-12 2001-04-12 Uusi päällystyspastakoostumus
PCT/FI2002/000310 WO2002084028A1 (fr) 2001-04-12 2002-04-12 Nouvelle composition de couleur pour revetement

Publications (1)

Publication Number Publication Date
EP1381735A1 true EP1381735A1 (fr) 2004-01-21

Family

ID=8560985

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02714250A Withdrawn EP1381735A1 (fr) 2001-04-12 2002-04-12 Nouvelle composition de couleur pour revetement

Country Status (3)

Country Link
EP (1) EP1381735A1 (fr)
FI (1) FI116536B (fr)
WO (1) WO2002084028A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI124806B (fi) 2008-12-18 2015-01-30 Kemira Oyj Päällystyspastakoostumus ja sillä päällystetty paperi tai kartonki
FI122694B (fi) 2008-12-18 2012-05-31 Kemira Oyj Menetelmä vesipitoisen pigmenttilietteen reologisten ominaisuuksien parantamiseksi ja dispergointiaine
CN114481703B (zh) * 2022-02-28 2023-01-31 山东博汇纸业股份有限公司 一种适用于高速转移镀铝连线剥离的烟卡及其生产方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1514428A (en) * 1975-05-05 1978-06-14 Champion Int Corp Starch/latex cast coatings for paper
US4301017A (en) * 1980-04-28 1981-11-17 Standard Brands Incorporated Stable, liquid starch graft copolymer composition
US5003022A (en) * 1989-02-10 1991-03-26 Penford Products Company Starch graft polymers
DE3922784A1 (de) * 1989-07-11 1991-01-17 Synthomer Chemie Gmbh Verfahren zur herstellung waessriger, dextrinhaltiger polymerisatdispersionen
FI95917C (fi) * 1992-04-16 1996-04-10 Raision Tehtaat Oy Ab Paksuntava dispersio ja sen käyttö

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02084028A1 *

Also Published As

Publication number Publication date
FI20010773L (fi) 2002-10-13
WO2002084028A1 (fr) 2002-10-24
FI20010773A0 (fi) 2001-04-12
FI116536B (fi) 2005-12-15

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