Process for surface sizing paper and paper prepared thereby

Details Process for surface sizing paper and paper prepared thereby Process for surface sizing paper and paper prepared thereby

1997-04-28

2000-04-18

Chin, Peter

Paper making and fiber liberation

Processes and products

With coating after drying

1621681, 1621687, 162169, 162136, D21H 1900

Patent

active

060511079

ABSTRACT:
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 T.sub.G about -15.degree. C. to about 50.degree. 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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