Stable aqueous emulsions comprising a resinic acid isocyanate, a non-ionic and/or anionic emulsifier and an optionally chlorinated hydrocarbon are used as sizing agents for paper or paper-like materials.
Novel reaction product salts of (A) 1.0 epoxy group equivalent of a diglycidyl ether, (B) 0.2 to 1.0 amino group equivalent of a polyalkylenepolyaminoamide of (B') a polymerised, unsaturated fatty acid and (B") an aliphatic polyalkylenepolyamine, (C) 0.3 to 0.6 amino group equivalent of a primary fatty amine, (D) 0 to 1.0 mol of an epihalogenohydrin per epoxy group equivalent of component (A) and (E) 0.01 to 0.5 mol of a fatty acid or lower alkyl ester, isocyanate, halide or ketene dimer thereof per amino group equivalent of components (B) and (C), which can be used as paper sizes.
In the inversion process for preparing paper size from fortified rosin wherein a water-soluble dispersing agent including an ethylene oxide sulphate group is used to provide a stable aqueous dispersion of fortified rosin; and an invert size produced by such a process.
This invention relates to compositions comprising a polyisocyanate having ionic groups or polyether groups and at least one member selected from the group consisting of a naturally occurring polymer, a polysiloxane graft copolymer, a water-dilutable synthetic polymer and a cationic polymer or a naturally occurring polymer and at least one member selected from the group consisting of a polysiloxane graft copolymer, a water-dilutable synthetic polymer and a cationic polymer.
The invention relates to a new process for the preparation of cellulose-containing material provided with a dry-strength and wet-strength finish and/or sized, characterized in that the cellulose-containing material is treated with a water-dispersible polyisocyanate mixture (I), which contains tertiary amino and/or ammonium groups, optionally polyether units and optionally hydrophobic groups.
Novel pulp, paper and paperboard manufacturing methods utilizng non polar organic solvents. These solvents can be introduced into the pressing operation of the pulp, paper, or paperboard making machine or can be substituted for water at any point after the formation stage. The result is a significant saving in dryer energy which can be translated to greater productivity in dryer-limited processes, accompanied by an improvement in tensile strength and other physical properties.
