Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1996-05-08
1997-09-30
Dudash, Diana
Coating processes
With post-treatment of coating or coating material
Heating or drying
427411, B05D 300
Patent
active
056723920
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for the preparation of recording materials for inkjet printers by applying aqueous coating compositions to one or both sides of a sheet of paper which has been treated with size.
DE-A-30 16 766 discloses recording materials for inkjet printers, which are prepared, for example, by coating a sized paper with a talc-containing aqueous solution of gelatin or with an aqueous solution of hydroxyethylcellulose and polyethyleneimine, and then drying and calendering the coated paper.
DE-A-31 32 248 discloses inker recording materials consisting of a support coated with at least one basic latex polymer. According to the examples, a sheet of sized paper is coated with an aqueous solution, containing aluminum silicate, of unspecified polymers and gelatin, and then passed through a calender.
EP-A-0 387 893 relates to a recording sheet for inkjet printers. The recording sheet consists of a base layer which on one side has an ink-receiving layer and on the other side has a layer which prevents penetration of the ink.
The subject of EP-A-0 445 327 is a recording material suitable for the inkjet printing method that consists of a sized base paper with a polyolefin coating on one side and with, on the other side, an ink-receiving layer which consists of a mixture of gelatin and rice starch.
EP-B-0 257 412 and EP-B-0 276 770 disclose sizing agents for paper which are based on finely divided, aqueous dispersions of copolymers which are obtainable by copolymerizing ethylenically unsaturated monomers by emulsion polymerization in the presence of degraded starches. The monomer mixtures which are polymerized in the aqueous solution of a degraded starch comprise C.sub.3 -C.sub.8 alcohol and copolymerizable monomers.
Monomers of group c) which can also be employed if desired are monomers containing tertiary and/or quaternary amino groups. The sizing agents can be employed in both the engine sizing and the surface sizing of paper.
It is an object of the present invention to provide a process for the preparation of inexpensive recording materials for inkjet printers. The recording materials are to ensure a high ink density and good water resistance of the inkjet-printed image.
We have found that this object is achieved, in accordance with the invention, by a process for the preparation of recording materials for inkjet printers by applying aqueous coating compositions to one or both sides of a sheet of paper which has been treated with size, using as coating composition an aqueous dispersion containing from 20 to 200g/l of starch and from 0.5 to 50 g/l of a copolymer which is obtainable by emulsion copolymerization of 100 parts by weight of a monomer mixture comprising acrylonitrile and/or methacrylonitrile, alcohols having 1 to 18 carbon atoms, quaternary amino groups, and monomers the monomers, of at least one natural or synthetic protective colloid, and if synthetic cationic protective colloids are used it is also possible to carry out the emulsion copolymerization in the absence of monomers of group (c).
The paper which is coated according to the invention can be composed of any known base materials for papermaking: use can be made, for example, of ground wood, thermomechanical pulp (TMP), chemothermomechanical pulp (CTMP), pressure-ground pulp (PGW) and sulfite and sulfate pulp, each of which can be short- or long-fibered and bleached or unbleached. Cellulose can also be used as a raw material for the production of the pulp. Suitable supports for the recording materials include both filled and unfilled papers. The content of filler in the paper can be up to a maximum of 30% by weight, and is preferably in the range from 5 to 25% by weight filler. Examples of suitable fillers are clay, kaolin, chalk, talc, titanium dioxide, calcium sulfate, barium sulfate, alumina, satin white or mixtures of these fillers. The paper used as support for the recording materials for inkjet printers are preferably engine-sized beforehand, but can also be surface sized. The sized paper has, for example, Cobb values o
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De Clercq Arnold
Hohr Lothar
Riebeling Ulrich
BASF - Aktiengesellschaft
Dudash Diana
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