Patent ID: 8633274

Claim:
An aqueous dispersion of a reactive size which comprises: a reactive phase comprising one or more diketenes and an anionic dispersant; and a protective colloid comprising a cationic polymer comprising vinylamine units; wherein the protective colloid comprises less than 0.0001% by weight, based on the protective colloid, of the diketenes; and wherein the anionic dispersant is at least one selected from the group consisting of a condensate of a naphthalenesulfonic acid and formaldehyde; a condensate of a phenol, phenolsulfonic acid and formaldehyde; a condensate of a naphthalenesulfonic acid, formaldehyde and urea; a condensate of a phenol, phenolsulfonic acid, formaldehyde and urea; a ligninsulfonate; a cationic acrylate polymer; and a cationic acrylamide polymer, wherein the aqueous dispersion contains less than 0.1% by weight of cationic starch.