Improved size press coating method

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 7/00 (2006.01) D21H 19/12 (2006.01) D21H 19/20 (2006.01) D21H 19/54 (2006.01) D21H 19/58 (2006.01) D21H 19/82 (2006.01) D21H 23/32 (2006.01)

Patent

CA 2283226

The invention provides an improved method of coating mediumweight and heavyweight papers in a size press by applying a paper coating composition comprising a binder wherein the binder comprises a stable aqueous dispersion comprising a water insoluble component and a water soluble component such that the water insoluble component comprises coalescable polymer particles which have a T g less than 55° C and a majority of which have a particle size less than 1 micron; and the water soluble component comprises a water soluble polymer capable of inhibiting coalescence of said polymer particles, or a water soluble polymer and a component capable of inhibiting coalescence of said polymer particles; and wherein said water insoluble component comprises greater that 3 % and less than 75 % by weight of the binder solids and said water soluble component comprises greater than 25 % and less than about 97 % of said solids.

L'invention concerne un procédé de couchage amélioré, destiné au papier de grammage moyen ou élevé et utilisé dans une presse encolleuse par l'application d'une composition de couchage qui contient un liant, ledit liant comprenant une dispersion aqueuse stable qui contient un composant insoluble dans l'eau et un composant soluble dans l'eau, le composant insoluble dans l'eau comprenant des particules polymères aptes à la coalescence, qui possèdent une Tg inférieure à 55 DEG C et dont la plupart ont une taille inférieure à 1 micron; le composant soluble dans l'eau comprend un polymère hydrosoluble capable d'inhiber la coalescence desdites particules polymères, ou un polymère hydrosoluble et un composant capable d'inhiber la coalescence desdites particules polymères. Ledit composant insoluble dans l'eau comprend plus de 3 % et moins de 75 % en poids des solides du liant, le composant hydrosoluble comprenant plus de 25 % et moins d'environ 97 % desdits solides.

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