Patent ID: 7429309

Claim:
A paper stock composition comprising: a sizing agent selected from the group consisting of alkyl ketene dimers and alkenyl ketene dimers in an amount of 1-7 dry lbs/ton of stock; an acrylic acid containing material in an amount of 35-40 dry lbs/ton of the stock; a crosslinking agent in an amount sufficient to crosslink the acrylic acid containing material, the crosslinking agent selected from the group consisting of ammonium oxide, calcium oxide, magnesium oxide, magnesium stearate, isostearate, calcium stearate, stannous oxide, tungsten oxide, sodium tungstate sodium tungstate dehydrate, zinc octoate, aluminum stearate, aluminum oxide, zinc salts of fatty acids, zinc oxide, zirconium oxide, calcium isostearate, calcium salts of fatty acids, magnesium salts of fatty acids, and aluminum salts of fatty acids; and wood fibers; wherein the acrylic acid containing material is poly(methylmethacrylate).