Fast film formation water based barrier coating

摘要

The invention relates to a composition which, when mixed with a polymer composition, allows for the formation of a continuous and cohesive film. The film is characterized in that it provides water, grease and oil resistance, provides a water vapor barrier and can used as wax replacement treatment and a top coat for flexible packaging, but also on other substrates. This film is formed at a very fast set speed without the need of thermal energy. The composition contains i) a salt of one or more of myristic, palmitic and stearic acid; and preferably also ii) a C9-C18 fatty acid complex of a metal ion, the metal ion having an oxidation state of at least 3. The invention also provides processes and coated substrates.

主权项

1. A process for providing water, vapour, oil and grease resistance to a paper or paperboard material comprising:
I. combining a) a salt of one or more of myristic, palmitic and stearic acid, said salt being selected from the group consisting of sodium, potassium, calcium, and zinc salts; and b) a polymeric composition comprising a polymer, a copolymer, or mixtures of polymers or copolymers, in the presence of an aqueous solvent to form a liquid water-based film-forming composition;
II. Coating directly on a paper or paperboard surface of the paper or paperboard material with a liquid coating of said liquid film-forming composition; andIII. allowing a solid film of said polymeric composition to form from said liquid coating on the material at a temperature less than 50° C.