Water retaining and optical brighteners activating polymeric composition, paper coating colours and coated paper

摘要

Aqueous polymeric composition, stable in liquid form, which enables regulation of water retention, activation of whiteners and viscosity of paper sizes, comprises at least a polyvinylic alcohol (PVA) and at least a neutral or alkaline hydrosoluble polymer. Aqueous polymeric composition, stable in liquid form, which enables regulation of water retention, activation of whiteners and viscosity of paper sizes, comprises at least a polyvinylic alcohol (PVA) and at least a neutral or alkaline hydrosoluble polymer; said PVA having Ostwald viscosity less than 5 mPa.s corresponding to degree of polymerisation less than 600; and degree of hydrolysis = 70-100 mol.% measured from ester index corresponding to mol.% vinyl acetate groups = 30 - 0. Independent claims are also included for an aqueous suspension or slurry of mineral fillers containing the composition for use in paper sizes; and a sheet of paper coated with the suspension or slurry.