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EP0381379B1 - Procédé d'impression offset lithographique - Google Patents

Procédé d'impression offset lithographique Download PDF

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Publication number
EP0381379B1
EP0381379B1 EP90300790A EP90300790A EP0381379B1 EP 0381379 B1 EP0381379 B1 EP 0381379B1 EP 90300790 A EP90300790 A EP 90300790A EP 90300790 A EP90300790 A EP 90300790A EP 0381379 B1 EP0381379 B1 EP 0381379B1
Authority
EP
European Patent Office
Prior art keywords
parts
paper
vinyl
weight
coating composition
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
EP90300790A
Other languages
German (de)
English (en)
Other versions
EP0381379A1 (fr
Inventor
Razmik Baghdassar-Zadeh Boodaghians
David Bretland Farmer
Roy Gordon Phillipps
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.)
Unilever PLC
Unilever NV
Original Assignee
Unilever PLC
Unilever NV
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 Unilever PLC, Unilever NV filed Critical Unilever PLC
Publication of EP0381379A1 publication Critical patent/EP0381379A1/fr
Application granted granted Critical
Publication of EP0381379B1 publication Critical patent/EP0381379B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/60—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters

Definitions

  • This invention relates to a process of offset lithographic printing wherein, prior to printing, the paper is coated with a pigmented composition comprising an aqueous emulsion containing copolymers of vinyl alkanoate and alkylene monomer in which vinyl alkanoate is the major component.
  • Paper coating compositions usually comprise an aqueous polymer binder emulsion, a pigment and optionally other additives common in the technology.
  • EP-A-0295727 (Shell) describes polymer emulsions containing vinyl acetate, ethylene and versatates (Veova 9@) for use in paint compositions to give non tacky surfaces which are alkali resistant. These benefits are demonstrated in comparison with Veova@ 10. The description suggests the emulsions are usable in paper coating and other fields, but there is no disclosure of the wet pick benefit identified in the present application.
  • EP-A-0172354 (Air Products) describes vinyl alkanoate/Ethylene emulsions for paper coating which provide enhanced dry pick strength and gloss.
  • the additional monomers are unsaturated acids/esters and dicyclopenta-dienyl acrylate. Vinyl versatates are quoted as examples of the alkanoates but there is no suggestion to use them as a third monomer with VA/E. VA/E is stated to lack sufficient wet pick resistance for offset printing.
  • GB-A-1144316 (Dunlop) describes alkali-soluble polymer emulsions formed from quaternary alpha carbon carboxylic, vinyl carboxylate and unsaturated carboxylic monomers. pH and viscosity stability derive from the tertiary monomer.
  • Coating compositions will contain a pigment, for example clay, which is compounded with the latex binder and used in coating a cellulosic web for example a paper or paperboard web.
  • a pigment for example clay
  • the characteristics of the latex binder component are significant in the ease of preparation of the paper coating composition, its application and on the qualities of the coated product.
  • the coating composition will be coated on to a paper substrate, dried and calendered. Usually the composition will be applied at a level to give a loading of about 18 to about 24 g/m 2 solids on one surface.
  • the copolymer particles will bind those of the pigment filler to provide cohesive strength and contribute to the adhesion between the coating and paper substrate.
  • the coating which will usually have a thickness of about 3 /1.m (microns) to about 10 ⁇ m (microns) imparts gloss and whiteness to the paper and provides a suitable surface for receiving ink.
  • the coating When the coating is subjected to successive printing operations, for example in offset lithography, the coating must provide acceptable wet and dry pick strengths.
  • the first colour When the first colour is printed any pull by the tacky ink giving failure of the coating is termed 'dry pick'.
  • the paper coating composition used in the process of the invention comprises, in addition to a pigment, an aqueous copolymer emulsion having a solids content from about 20% to about 70% by weight and comprising
  • This product has good rheology and dry pick strength and enhanced wet pick strength which is attributable to the presence of vinyl ester (iii) monomers. There is a general requirement in paper coating to improve these characteristics.
  • the invention pertains to a process for offset lithographic printing of paper wherein, prior to printing, the paper is coated with a pigmented paper coating composition comprising,
  • the polymerisation system will be substantially free of protective colloids. Colloidal materials may be added subsequently to the paper coating composition.
  • vinyl acetate is the preferred vinyl alkanoate monomer because of its availability, cost and known reactivity
  • other vinyl esters within the class defined are usable in particular vinyl formate, propionate, butyrate and isobutyrate.
  • the preferred alkylene is ethylene but other ethylenic hydrocarbons, for example propylene, butylene and isobutene are usable.
  • the copolymer may contain minor monomer components added to provide specific benefits, examples are sodium vinyl sulphonate, acrylic acid, methacrylic acid, acrylamide, hydroxy functional acrylates, vinyl silanes and vinyl halides.
  • a favoured comonomer is a polyethylencially unsaturated compound selected from triallyl cyanurate, triallyl isocyanurate, diallyl maleate, diallyl fumarate, divinyl benzene and diallyl phthalate.
  • At least one surfactant used in the polymerisation process contains a C14 to C20 alkenylene moiety and examples are an oleyl propanol amide sulphosuccinate obtainable from Witco of USA under the trade name Emcol K8300@ and the potassium salt of the sulphonation product of oleic acid obtainable from Lankro Chemicals of Manchester England under the trade name Lankropol OPA@.
  • the paper coating composition comprises a pigment, for example clays, hydrated silica clays, and other conventional ingredients.
  • the clays used include Kaolin group clays and hydrated silica clays, specific clays are disclosed in "Kaolin Clays and their Industrial Uses" by J. M. Huber Corp. (1949) New York chapters 10 to 16.
  • pigments for example calcium carbonate, titanium dioxide, blanc fixe, lithopone and zinc sulphide may be used in addition to clay.
  • the paper coating composition will comprise
  • the coating compositions produced with the aid of the latexes of the invention will be applied to fibrous paper webs using conventional means for example trailing blade coaters, air knife coaters and roll coaters.
  • a surfactant solution comprising 37% aq. solution of Emcol K8300@ (74.2g), 30% aq solution of Aerosol A102@ (53.2g) and ammonium persulphate (4.3g) dissolved in deionised water (999g) was prepared and charged to a 4 litre pressure vessel. The contents are heated to 68 °C. At 68 °C the reactor was purged twice with nitrogen, once with ethylene and pressurised with ethylene to 31 bar (450 Ibs/sqin) gauge with stirring. The temperature was adjusted to 76 °C while 10% of the liquid monomer phase was pumped to the reactor.
  • reaction mass was held at 80 ° C for 45 mins, at the end of which the addition of persulphate solution was stopped.
  • the contents of the reactor was cooled to 40 ° C, followed by pumping of finishing off stage (4.6g of each in 70g of deionised water) to the reactor, in separate streams, over 30 minutes.
  • the contents of the reactor were then cooled to 25 °C and discharged to a degassing tank.
  • Ammonia solution was used to adjust the pH of the emulsion latex to 8.
  • the emulsion had a solids content of 51.6% by wt.
  • Example II Additional examples were performed using the process steps of Example I but varying the quantities of the base monomers, i.e. vinyl acetate, VeoVa 9@ and ethylene, the functional monomers and the stabilising surfactants. These emulsions were also tested for wet and dry pick strengths.
  • the base monomers i.e. vinyl acetate, VeoVa 9@ and ethylene
  • the functional monomers i.e. vinyl acetate, VeoVa 9@ and ethylene
  • stabilising surfactants i.e. vinyl acetate, VeoVa 9@ and ethylene
  • the emulsion products had solids contents comparable to that obtained in Example I.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Lubricants (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Paints Or Removers (AREA)
  • Polymerisation Methods In General (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Steroid Compounds (AREA)

Claims (3)

1. Procédé pour l'impression par offset lithographique d'un papier, dans lequel, avant l'impression, le papier est revêtu d'une composition pigmentée de revêtement du papier, comprenant:
i) jusqu'à 100 parties de pigment et
ii) d'environ 3 parties à environ 30 parties en poids sec d'une émulsion aqueuse de copolymère ayant une teneur en solides d'environ 20% à environ 70% en poids et comprenant
iii) d'environ 60% à environ 90% en poids d'un vinyl alkanoate en C1 à C4,
iv) d'environ 5% à environ 20% d'un monomère alkylène en C2 à C4, et
v) d'environ 5% à environ 20% en poids, de préférence d'environ 8% à 15% en poids, d'esters vinyliques ayant la formule générale R1 R2 R3 CCOOCHCH2 dans laquelle R1 R2 et R3 sont chacun un groupe alkyle ayant au moins un atome de carbone et la somme des atomes de carbone dans R1 + R2 + R3 vaut de 6 à 9.
2. Procédé tel que revendiqué dans la revendication 1, dans lequel la composition pigmentée de revêtement du papier comprend en outre:
d'environ 0,1 à environ 0,5 partie d'agent dispersant,
d'environ 0 à environ 2,5 parties de coliant,
d'environ 0 à environ 0,2 partie d'anti-moussant, et
de l'eau en quantité appropriée.
3. Procédé tel que revendiqué dans la revendication 1, dans lequel la composition est appliquée en une quantité donnant environ 18 g/m2 à environ 24 g/m2 de solides secs.
EP90300790A 1989-01-27 1990-01-25 Procédé d'impression offset lithographique Expired - Lifetime EP0381379B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB898901871A GB8901871D0 (en) 1989-01-27 1989-01-27 Emulsion polymerisation
GB8901871 1989-01-27

Publications (2)

Publication Number Publication Date
EP0381379A1 EP0381379A1 (fr) 1990-08-08
EP0381379B1 true EP0381379B1 (fr) 1994-10-12

Family

ID=10650749

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90300790A Expired - Lifetime EP0381379B1 (fr) 1989-01-27 1990-01-25 Procédé d'impression offset lithographique

Country Status (11)

Country Link
EP (1) EP0381379B1 (fr)
AT (1) ATE112716T1 (fr)
AU (1) AU4965790A (fr)
CA (1) CA2024810A1 (fr)
DE (1) DE69013182T2 (fr)
DK (1) DK0381379T3 (fr)
ES (1) ES2062325T3 (fr)
FI (1) FI904628A0 (fr)
GB (1) GB8901871D0 (fr)
PT (1) PT92978A (fr)
WO (1) WO1990008853A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015148888A1 (fr) 2014-03-27 2015-10-01 Wacker Chemical Corporation Liant pour compositions de couchage du papier
US9803101B2 (en) 2014-03-27 2017-10-31 Wacker Chemie Ag Aqueous vinyl acetate ethylene copolymer dispersion for paper coating

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9015844D0 (en) * 1990-07-19 1990-09-05 Unilever Plc Emulsion polymerisation
AU676654B1 (en) * 1996-03-27 1997-03-13 Kuraray Co., Ltd. Paper coating agent
WO2014036740A1 (fr) * 2012-09-10 2014-03-13 Celanese Emulsions Gmbh Liants d'éthylène d'acétate de vinyle fonctionnalisés pour revêtements de papier et de carton

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0172354A1 (fr) * 1984-06-22 1986-02-26 Air Products And Chemicals, Inc. Emulsions d'un copolymère d'un ester de vinyl-éthylène pour compositions de revêtement de papier
EP0295727A2 (fr) * 1987-05-21 1988-12-21 Shell Internationale Researchmaatschappij B.V. Polymères d'éthylène et d'esters vinyliques

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6513811A (fr) * 1965-10-26 1967-04-27
JPS59223396A (ja) * 1983-05-30 1984-12-15 住友化学工業株式会社 紙用塗工組成物

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0172354A1 (fr) * 1984-06-22 1986-02-26 Air Products And Chemicals, Inc. Emulsions d'un copolymère d'un ester de vinyl-éthylène pour compositions de revêtement de papier
EP0295727A2 (fr) * 1987-05-21 1988-12-21 Shell Internationale Researchmaatschappij B.V. Polymères d'éthylène et d'esters vinyliques

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015148888A1 (fr) 2014-03-27 2015-10-01 Wacker Chemical Corporation Liant pour compositions de couchage du papier
US9803101B2 (en) 2014-03-27 2017-10-31 Wacker Chemie Ag Aqueous vinyl acetate ethylene copolymer dispersion for paper coating

Also Published As

Publication number Publication date
ATE112716T1 (de) 1994-10-15
FI904628A0 (fi) 1990-09-20
DE69013182D1 (de) 1994-11-17
DK0381379T3 (da) 1994-11-21
WO1990008853A1 (fr) 1990-08-09
DE69013182T2 (de) 1995-02-16
EP0381379A1 (fr) 1990-08-08
AU4965790A (en) 1990-08-24
ES2062325T3 (es) 1994-12-16
PT92978A (pt) 1990-07-31
GB8901871D0 (en) 1989-03-15
CA2024810A1 (fr) 1990-07-28

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