Coating composition for papers providing excellent water vapor barrier properties

Abstract

Composition for surface treatment of paper, paperboard or the like, which composition on a solids weight basis comprises: 20 to 55% of a binder with glass transition temperature lower than 30° C.; 45 to 80% of a talcum with an average particle size between 500 and 2000 nm, preferably 33 to 40% of a binder with glass transition temperature lower than 30° C.; 60 to 67% of a talcum with an average size between 500 and 2000 nm. The binder is a styrene butadiene latex, and the talcum has an aspect ratio of higher than 30, preferably of higher than 50, and the specific surface area of the talcum particles is between 10 and 20 m2/gr, preferably between 14 and 18 m2/gr.

Dependencies are inferred from the claim text.