Patent ID: 6989191

Claim:
A composite paper material with a pressure-sensitive adhesive coating resistant to repulping, said composite paper material comprising a paper carrier, a layer of pressure-sensitive adhesive, and an interlayer film between said paper carrier and said layer of pressure-sensitive adhesive, said interlayer film comprising a moisture-resistant, hydrophilic, and non-repulpable dispersion polymer film containing a protective colloid, an emulsifier, or both a protective colloid and an emulsifier, said protective colloid and/or emulsifier facilitating detachment of said interlayer film from said paper carrier during a repulping process, said dispersion polymer film having a glass transition temperature Tg, from −20° C. to +40° C., and comprising one or more polymers selected from the group consisting of homo- and copolymers of vinyl esters of alkylcarboxylic acids having 1 to 15 C atoms, homo- and copolymers of esters of (meth)acrylic acid with alcohols having 1 to 12 C atoms, and styrene/butadiene copolymers, each of said homo- and copolymers optionally further containing crosslinkable, ethylenically unsaturated monomers, and up to 5 weight percent based on the weight of the dispersion polymer of water soluble, ethylenically unsaturated monomers other than said crosslinkable ethylenically unsaturated monomers, said interlayer positioned adjacent said layer of pressure-sensitive adhesive.