| 摘要 |
A process for preparing sized paper which incorporates in the paper a size composition containing polymer latex, wherein the polymer contained in the polymer latex is anionic polymer having properties selected from the group consisting of TG about - 15 ~C to about 50 ~C and acid number about 30 to about 100, and wherein the polymer latex has a zeta potential of from about 25 to about - 70 millivolts over the pH range of about 5 to about 9. A preferred process has the steps: a) providing an aqueous pulp suspension; b) sheeting and drying the aqueous pulp suspension to obtain paper; c) treating the paper by applying to at least one surface of it the size composition containing polymer latex and starch; and d) drying the paper to obtain sized paper. Preferred anionic polymers are copolymers of monomers comprising styrene or substituted styrene, alkyl acrylate or methacrylate and ethylenically unsaturated carboxylic acid.
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