Sizing of paper

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 21/16 (2006.01)

Patent

CA 2634697

The invention relates to an aqueous dispersion of cellulose-reactive sizing agent containing an acid anhydride, an anionic polyelectrolyte and a nitrogen- containing organic compound which is an amine or quaternary ammonium thereof having a molecular weight less than 180 and/or having one or more hydroxyl groups. The invention further relates to a method for the preparation of an aqueous dispersion of cellulose-reactive sizing agent which comprises dispersing an acid anhydride in an aqueous phase in the presence of an anionic polyelectrolyte and a nitrogen-containing organic compound which is an amine or quaternary ammonium thereof having a molecular weight less than 180 and/or having one or more hydroxyl groups. The invention also relates to the use of the aqueous dispersion of cellulose-reactive sizing agent as a stock sizing agent or surface sizing agent in the production of paper. The invention further relates to a process for the production of paper which comprises adding the aqueous dispersion of cellulose-reactive sizing agent to an aqueous cellulosic suspension.

La présente invention concerne une dispersion aqueuse d~agent de collage réactif à la cellulose contenant un anhydride acide, un polyélectrolyte anionique et un composé organique contenant de l~azote qui est une amine ou un ammonium quaternaire de celui-ci ayant une masse moléculaire inférieure à 180 et/ou ayant un ou plusieurs groupes hydroxyles. La présente invention concerne en outre un procédé de préparation d~une dispersion aqueuse d~agent de collage réactif à la cellulose comprenant l~étape consistant à disperser un anhydride acide dans une phase aqueuse en présence d~un polyélectrolyte anionique et d~un composé organique contenant de l~azote qui est une amine ou un ammonium quaternaire de celui-ci ayant une masse moléculaire inférieure à 180 et/ou ayant un ou plusieurs groupes hydroxyles. La présente invention concerne également l~utilisation de ladite dispersion aqueuse d~agent de collage réactif à la cellulose en tant qu~agent de collage dans la masse ou agent de collage en surface dans la fabrication du papier. L~invention concerne en outre un procédé de fabrication du papier comprenant l~étape consistant à ajouter la dispersion d~agent de collage réactif à la cellulose à une dispersion aqueuse cellulosique.

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