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US 6,294,645 B1Granted
Dry-strength system
AssigneeHercules Incorporated
InventorsAnthony J. Allen, Elliott Echt, William W. Maslanka, Jeffrey C. Peters
Life of this patent
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Abstract
The invention relates to resin systems useful for imparting dry-strength to paper without substantially increasing the paper's wet-strength wherein the resin system comprises a cationic component and an anionic component. The invention also relates to the process for incorporating these resin systems into paper and the paper produced containing the resin systems.
Claims14
A dry-strength system for paper comprising:
- a cationic component and an anionic component wherein the cationic component comprises a reaction product of an intralinker and a polyamidoamine, and wherein the polyamidoamine prior to reacting with the intralinker has a reduced specific viscosity of less than about 0.125 dl/g and wherein the intralinker to amine is in a ratio of 0.10:1 to about 0.40:1 on a molar basis and wherein the intralinker is selected from the group consisting of epihalohydrins and diepoxides.
A dry-strength system for paper comprising:
- a cationic component and an anionic component
- wherein the cationic component comprises a reaction product of an intralinker and a polyamidoamine, and wherein the polyamidoamine prior to reacting with the intralinker has a reduced specific viscosity of less than about 0.125 dl/g and wherein the intralinker to amine is in a ratio of about 0:75:1 or less on a molar basis and wherein the intralinker is selected from the group consisting of epihalohydrins and diepoxides;
- and
- wherein the anionic component comprises a copolymer of acrylamide and at least one member selected from the group consisting of acrylic acid, itaconic acid, methacrylic acid and 2-acrylamido-2-methyl-1-propanesulfonic acid and salt thereof;
- carboxymethylcellulose;
- carboxymethyl guar;
- alginic acid;
- pectin;
- poly(2-acrylamodo-2-methyl-1-propanesulfonic acid), and salts thereof;
- and an amphoteric polymer.
7 more elements
A dry-strength system for paper comprising:
- a cationic component comprises a reactionproduct of an intralinker and a polyamidoamine, and wherein the polyamidoamine prior to reacting with the intralinker has a reduced specific viscosity of less than about 0.125 dl/g and wherein the intralinker to amine is in a ratio of about 0.75:1 or less on a molar basis and wherein the intralinker is selected from the group consisting of epihalohydrins and diepoxides;
- and
- wherein the anionic component comprises and anionically-modified form of lignin wherein the anionically modified form of lignin comprises oxidized, sulfonated or carboxymethylated lignin.
A dry-strength system for paper comprising:
- a cationic component and an anionic component
- wherein the cationic component comprises a reaction product of an intralinker and a polyamidodmaine, and wherein the polyamidomaine prior to reacting with the intralinker has a reduced specific viscosity of less than about 0.125 dl/g and wherein the intralinker to amine is in a ratio of about 0.75:1 or less on molar basis and wherein the intralinker is selected from the group consisting of epichalohydrins and diepoxides;
- and
- wherein the anionic component comprises an anionically-modified form of cellulose comprises oxidized, sulfonated or carboxymethylated cellulose.
1 more element
The dry-strength system for comprising:
- a cationic component and an anionic component wherein the cationic component comprises a reaction product of an intralinker and a polyamidoamine, and wherein the polyamidoamine prior to reacting with the intralinker has a reduced specific viscosity of less than about 0.125 dl/g and wherein the intralinker to amine is in a ratio of about 0.75:1 or less on a molar basis and wherein the intralinker is selected from the group consisting of epihalodyrins and diepoxides;
- and wherein the dry-strength system further comprises cationic starch.
Dependencies are inferred from the claim text.