FIELD: paper-and-pulp industry.
SUBSTANCE: process comprises manufacturing sized paper in presence of sizing substance and water-soluble amphoteric promoter resin, which is obtained via polymerization of a monomer including at least one polymerizable cationic amine monomer and at least one polymerizable organic acid and wherein molar percentage of cationic amine constitutes at least 25% of monomers in amphoteric promoter resin and molar percentage of organic acid units constitutes at least 25% of monomers in amphoteric promoter resin, while whiteness loss is below 0.5 TAPPI units as compared to whiteness of composition obtained without promoter resin.
EFFECT: improved sizing characteristics due to optical bleacher added and with excellent preservation of whiteness.
3 cl, 12 dwg, 2 tbl, 19 ex
