Patent ID: 6951962

Claim:
A water-dispersible oil/grease-sizing and water-sizing agent for cellulosic materials comprising repeating units that are comprised of a polyamine with at least 3 nitrogen atoms in each recurring monomer unit wherein the amino groups are partially or completely substituted by: a. a cellulose-reactive group which is formed by reaction of the polyamine and at least one reactive chemical which is selected from the group consisting of epi halohydrin, epi organosulfonates, and oxiranes, where the cellulose reactivity is present after reaction with the polyamine or is formed by subsequent reactivation; b. an oleophobic and hydrophobic fluorochemical group, which is substituted with an alkyl chain which has a hydrophillic group; wherein additionally, the cellulose-reactive group cross-links the polyamino groups and the M w molecular weight of the agent is 10,000 to 35,000,000 Daltons as measured by Size Exclusion Chromatography relative to a poly(methylmethacrylate) standard.