Patent ID: 8110071

Claim:
An impregnated paper with a high penetration resistance to fats and oils, comprising: a paper produced from strongly beaten pulps with a degree of beating of 15° SR to 90° SR, and internally sized with alkenyl succinic anhydride and/or alkyl ketene dimers (AKD) and/or resin sizes, wherein said paper is impregnated with an impregnating liquor which contains a binder system of 80 to 100 parts by mass of water-soluble binders and 20 to 0 parts by mass of water-insoluble polymers in dispersion, wherein said water-soluble binders are selected from ethylene-vinyl alcohol copolymers, acetalized ethylene-vinyl alcohol copolymers, acetalized polyvinyl alcohols, polyvinyl butyrals, cationically modified polyvinyl alcohols containing silanol groups, acetalized cationically modified polyvinyl alcohols containing acetalized silanol groups, polyvinyl alcohols containing carboxyl groups, and mixtures thereof.