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AssigneeJapan PMC Corporation
InventorsKatsunori Nakamura, Kazuki Nagao, Masayuki Monobe
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This invention provides a rosin emulsion sizing agent for papermaking comprising a fortified or unfortified rosin-epoxy compound obtained by reacting a rosin and an epoxy compound, wherein the rosin-epoxy compound is dispersed in water with the aid of an emulsifying and dispersing agent, and paper sized therewith and a method of sizing using the same. The rosin emulsion sizing agent of the present invention exhibits an distinguished sizing effect in neutral papermaking systems even when calcium carbonate is contained therein and is excellent in mechanical and storage stabilities while causing little foaming in the papermaking system. In addition, the sizing agent presents no significant difficulties in its production.
A rosin emulsion sizing agent for papermaking comprising a fortified or unfortified rosin-epoxy compound obtained by reacting a rosin and an epoxy compound containing two or more oxirane rings, said rosin-epoxy compound having an equivalent ratio of 0.2-100 equivalents of carboxyl group in the rosin per one equivalent of epoxy group in the epoxy compound, wherein the rosin-epoxy compound is dispersed in water with the aid of a material selected from the group consisting of anionic, nonionic and cationic surfactants and protective colloid materials and mixtures thereof.
Dependencies are inferred from the claim text.