Patent ID: 6482886
Filing Date: 2002-11-19
Classification: D06M,D21H

Abstract:
A method of externally sizing a fibrous material comprising:a) providing a basic aqueous dispersion consisting essentially of an interpolymer of an ethylenically unsaturated monomer and an ethylenically unsaturated carboxylic acid, the dispersion having an initial 23Â° C. Brookfield viscosity of less than or equal to 500 centipoise as measured with a # 3 spindle at 20 rpms, and b) before application to the material, admixing the dispersion with at least one starch solution to provide a dispersion/starch dilute solution having: i) a 23Â° C. Brookfield viscosity of equal to or greater than 150 centipoise as measured with a #3 spindle at 20 rpms, and ii) a total dispersion/starch solids concentration of less than 20 weight percent wherein the sized fibrous material is characterized as having a Hercules Size Test (HST) value at 85 percent reflectance of greater than 100, as determined in accordance with TAPPI Method T 530 pm-89.