Treating agent for a sheet surface and a paper for ink jet...

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 27/00 (2006.01) B41M 5/00 (2006.01) B41M 5/52 (2006.01) D21H 17/36 (2006.01)

Patent

CA 2303321

There is provided a treating agent for a sheet surface comprising a graft copolymer composed of a back bone polymer and branch polymer, either of which is a polymer having vinyl alcohol units, and the other of which is a polymer having cationic groups, the treating agent is applied onto a pulp sheet or plastic sheet, and the coated sheet is used in ink jet printing. Cationic groups are introduced by graft copolymerization using di(meth)allylamine-based and/or (meth)acryl-based monomer. Alternatively, the graft copolymer of the present invention is obtained by grafting N-vinylcarboxylic acid amide monomer followed by hydrolysis thereof. A formula weight ratio of vinylalcohol units and the introduced cationic groups of 1:20 to 2:1 is preferable in terms of balanced performance.

L'invention concerne un agent de traitement de surface de feuille contenant un copolymère greffé dans lequel l'une des deux parties que sont le squelette et les polymères ramifiés contient des unités d'alcool vinylique, l'autre partie contenant des groupes cationiques. On applique cet agent sur une feuille en plastique ou en papier de manière à produire une feuille enduite destinée à l'impression par jet d'encre. On introduit les groupes cationiques par la copolymérisation avec greffage d'une di(méth)allylamine ou d'un monomère (méth)acrylique. On peut également fabriquer ce copolymère greffé en greffant un monomère de N-vinylcarboxamide puis en hydrolysant le polymère greffé. Le rapport en poids des unités d'alcool vinylique aux groupes cationiques introduits est de préférence compris entre 1/20 et 2/1 dans le but d'équilibrer les caractéristiques de cet agent.

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