Paper coated with a functional polyolefin film

A process for preparing an omniphobic single layered coating onto paper or paperboard comprising the steps of:

• a) applying onto paper or paperboard a dispersion composition comprising water, a dispersant, a base polymer, and a neutralizing agent;
• and
• b) heating the composition to produce a cured film having a thickness in the range of 1 to 20 g/m2;
• wherein the sum of the dispersant and the base polymer comprise from 10 to 100 percent of the weight of polymer solids in the dispersion;
• wherein
• the dispersant is a copolymer with an acid value of 130 or less, comprising structural units of ethylene and a carboxylic acid monomer, wherein the copolymer has a melt flow index in the range of from 50 to 2000 g/10 min at 190° C./2.16 kg;
• wherein the weight-to-weight ratio of structural units of ethylene to carboxylic acid monomer is in the range of from 95:5 to 70:30;
• and wherein the dispersant has a concentration in the range of from 9 to 50 weight percent based on the weight of polymer solids in the dispersion, provided that the concentration of the dispersant in the composition is sufficient to form a cured film with a Cobb value of less than 18 g/m2 and oil contamination of less than 25 percent;
• the base polymer comprises non-functionalized ethylene-co-alkene copolymers, wherein the weight-to-weight ratio of the structural units of ethylene to alkene is in the range of from 99.8:0.2 to 50:50, has no copolymer comprising structural units of ethylene and a C1-C12-alkyl acrylate or methacrylate, and has a concentration in the range of from 1 to 90 weight percent, based on the weight of polymer solids in the dispersion;
• and
• wherein the neutralizing agent is a hard base and excludes an organic base having a boiling point of less than 250° C.;
• wherein the concentration of the neutralizing agent is sufficient to neutralize at least half of the carboxylic acid groups present in the dispersion composition.