Improved papermaking process

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 17/45 (2006.01) D21F 11/00 (2006.01) D21H 17/33 (2006.01) D21H 17/44 (2006.01) D21H 17/54 (2006.01) D21H 17/56 (2006.01) D21H 17/67 (2006.01) D21H 23/16 (2006.01) D21H 23/18 (2006.01)

Patent

CA 2235637

The claimed invention comprises a papermaking process comprising forming an aqueous cellulosic papermaking slurry, subjecting the slurry to one or more shear stages. adding to the slurry a mineral filler prior to at least one of the shear stages, adding to the slurry after the addition of the mineral filler and prior to at least one of the shear stages an effective amount of a dispersion polymer selected from the group consisting of copolymers of acrylamide and dimethylaminoethylacrylate methyl chloride quaternary salt (DMAEA.MCQ), dimethylaminoethylmethacrylate methyl chloride quaternary salt (DMAEM.MCQ), dimethylaminoethylacrylate benzyl chloride quaternary salt (DMAEA.BCQ) and dimethylaminoethylmethacrylate benzyl chloride quaternary salt (DMAEM.BCQ) and diallyldimethylammonium chloride (DADMAC), shearing the slurry adding a microparticle selected from the group consisting of organics such as copolymers of polyacrylic acid, inorganics such as bentonite and silica sol, draining the slurry to form a sheet, and drying the sheet to form a paper sheet. 27

L'invention revendiquée comprend un processus de fabrication du papier consistant à former une boue de cellulose aqueuse à papier, à soumettre la boue liquide à une ou à plusieurs étapes de cisaillement, à lui ajouter, après l'addition de la charge minérale et avant au moins une des étapes de cisaillement, une quantité efficace d'un polymère de dispersion choisi dans le groupe constitué des copolymères d'acrylamide et de sel quaternaire diméthylaminoéthylacrylate-chlorure de méthyle (DMAEA.MCQ), de sel quaternaire diméthylaminoéthylméthacrylate-chlorure de méthyle (DMAEM.MCQ), de sel quaternaire diaméthylaminoéthylacrylate-chlorure de benzyle (DMAE.BCQ) et de sel quaternaire diamnéthylaminoéthylméthacrylate-chlorure de benzyle (DMAEM.BCQ) et de chlorure de diallyldiméthylammonium (DADMAC), à cisailler la boue liquide, à lui ajouter une microparticule choisie dans le groupe composé de produits organiques comme des copolymères d'acide polyacrylique et de produits inorganiques comme un sol de bentonite et de silice pour former une feuille et à assécher la feuille pour en faire une feuille de papier.

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