Use in rotogravure printing of paper-coating compounds with a hi

Details Use in rotogravure printing of paper-coating compounds with a hi Use in rotogravure printing of paper-coating compounds with a hi

1997-12-22

1999-12-07

Funk, Stephen R.

Printing

Intaglio

Processes

428511, 428513, 524819, B41M 110, D21H 1910

Patent

active

059964898

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to a method of printing paper by gravure printing.
2. Description of the Background
In gravure printing the printing form has indentations which receive the printing ink which is transferred to the paper during printing. To achieve good printability, ie ready acceptance of the printing ink, the paper to be printed must exhibit as smooth a surface as possible; furthermore, the paper should have a high degree of flexibility, so that it bears well against the indentations when taking up ink.
A measure of the printing quality in the gravure printing process is, eg, the number of missing dots.
Furthermore, reduction in the concentration of binding agent in the paper-coating slips is required, as a result of which there arise increased demands on the pigment-binding power of the binding agents. It is also desirable to minimize the printing ink consumption without incurring loss of printing quality.
The paper to be printed is generally coated with a paper-coating slip.
Due to the peculiarities of the gravure printing process there also arise particular demands on the paper to be printed or the paper-coating slip.
EP-A 408,099 reveals binding agents having a butadiene content of from 0 to 100 wt %. Binding agents having a butadiene content of ca 36 wt % in paper-coating slips are used in said reference according to the examples.
Styrene Butadiene Latex Design and its Effect in Paper Applications, R. Groves (Minutes of Paper Week, 13-15.03.1984 in Bristol) reveals that the butadiene content in binding agents for paper-coating slips is usually from 30 to 45 wt %,


SUMMARY OF THE INVENTION

It is an object of the present invention to provide a method of printing paper which particularly well satisfies the demands of gravure printing.
Accordingly, we have found a method of printing paper by gravure printing, wherein the paper is coated with a paper-coating slip containing a binding agent having a butadiene content of at least 65 wt %, based on the binding agent.


DETAILED DESCRIPTION OF THE INVENTION

The statements below relate to preferred embodiments of the method of the invention.
The paper-coating slips contain, apart from pigment, binding agent as a substantial component. The binding agent is an ionically or preferably free radically polymerized polymer having a butadiene content of at least 65 wt %, preferably at least 74 wt %.
The polymer may be composed, in particular, of the following monomers:


______________________________________ 65-100 wt % of butadiene 0-35 wt % of C.sub.1 -C.sub.10 alkyl (meth)acrylates or vinyl aromatic compounds (referred to below as the main monomers), 10 wt % of ethylenically unsaturated acids, acid anhydrides or amides (referred to below as auxiliary monomers) and 0-30 wt % of other monomers. ______________________________________
The polymer preferably consists of


______________________________________ 65-99.5 wt % of butadiene 0-34.5 wt % of main monomers 0.5-15 wt % of auxiliary monomers and 0-30 wt % of other monomers. ______________________________________
More preferably, the polymer consists of


______________________________________ 74-95 wt % of butadiene 4-25 wt % of main monomers 1-8 wt % of auxiliary monomers and 0-5 wt % of other monomers. ______________________________________
Most preferably, the polymer consists of


______________________________________ 79-90 wt % of butadiene 9-20 wt % of main monomers 1-8 wt % of auxiliary monomers and 0-5 wt % of other monomers. ______________________________________
Examples of suitable main monomers are methyl (meth)acrylate, ethyl (meth)-acrylate, propyl (meth)acrylate, butyl (meth)acrylate and 2-ethylhexyl (meth)-acrylate and also .alpha.-methylstyrene and styrene.
Styrene and n-butyl acrylate are particularly preferred.
Examples of suitable auxiliary monomers are unsaturated carboxylic acids and/or their amides and/or anhydrides, such as acrylic acid, acrylamide, methacrylic acid, methacrylamid

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Dr. R. Groves (Doverstrand Limited), Styrene Butadiene Latex Design and its effect in Paper Application, Presented at `Paper Week 84` organized by P.I.T.A. in Bristol, Mar. 13.sup.th -15.sup.th, 1984.

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