REGISTRATION SHEET WITH IMPROVED PRINTING QUALITY AT LOW LEVELS OF ADDITIVES Russian patent published in 2014 - IPC D21H17/66 D21H21/16 B41M5/00

Abstract RU 2517511 C2

FIELD: printing.

SUBSTANCE: invention relates to recording sheets used in printing processes. The recording sheet comprises a substrate of the web of cellulosic fibres and the sizing composition. The sizing composition comprises a binder and a divalent metal salt. The said salt in a concentration of at least 51% of the total concentration and not less than 2500 parts per million is located at a distance within 25% of the total substrate thickness from at least one surface of the said substrate. At that the recording sheet has Q_total as a measure of the amount of the sizing agent in the transition from the outer edges towards the middle of the sheet in cross-section of less than 0.5. Also a method of production of the recording sheet is described.

EFFECT: said substrate and the sizing agent interact with formation of the I-shaped structure of the recording sheet which provides an optical density of black printing of at least 1,15.

20 cl, 15 dwg, 2 tbl, 10 ex

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RU 2 517 511 C2

Authors

Koenig Majkl F.

Dzhon Dzhakob P.

Arnson Tomas R.

Ligutsinski Bendzhamin T.

Dates

2014-05-27—Published

2009-03-31—Filed