Methods, Processes, and Compositions for Treating Pulp

Abstract

Methods, processes, and compositions for improving sizing efficiency in a paper-making process are provided. Pulp slurry is treated by using alkenyl succinic anhydride that is emulsified with a polymer emulsifier. The emulsified alkeny succinic anhydride is used in conjunction with paper-making filler particles that are modified with hydroxyl-containing hydrocarbon natural polymer polysaccharide.

1 . A method of treating a pulp slurry of a paper-making process, comprising:
 sizing a pulp slurry by using an alkenyl succinic anhydride emulsified with a polymer emulsifier, and   adding paper-making filler particles modified by a hydroxyl-containing hydrocarbon natural polymer polysaccharide compound to the pulp slurry.   
     
     
         2 . The method of  claim 1 , wherein the hydroxyl-containing hydrocarbon natural polymer polysaccharide comprises cooked cationic starch, cooked native starch, cellulose, cationic cellulose, chitosan, cationic chitosan, guar gum and cationic guar gum, or a combination thereof. 
     
     
         3 . The method of  claim 1 , wherein the paper-making filler particles are calcium carbonate particles. 
     
     
         4 . The method of  claim 1 , wherein the polymer emulsifier comprises a copolymer of acrylamide and a cationic monomer, a copolymer of glyoxal cross-linked acrylamide and a cationic monomer, or a combination thereof. 
     
     
         5 . The method of  claim 4 , wherein the polymer emulsifier is a copolymer of acrylamide and a cationic monomer having a weight average molecular weight of 10,000 to 1,000,000 Dalton. 
     
     
         6 . The method of  claim 4 , wherein the polymer emulsifier is a copolymer of a glyoxal cross-linked acrylamide and a cationic monomer having a weight average molecular weight of 100,000 to 3,000,000 Dalton. 
     
     
         7 . The method of  claim 4 , wherein the cationic monomer comprises dimethyldiallylammonium chloride, methylacrolyloxyethyltrimethyl ammonium chloride, N,N,N-trimethyl-3-(2-methylallylamido)-1-propylammonium chloride, N,N′-dimethylamino ethyl methacrylate, quatemary ammonium salt cation of N,N′-dimethylamino ethyl methacrylate, dimethylamino ethyl acrylate, quatemary ammonium salt of dimethylamino ethyl acrylate, diethylamino ethyl acrylate, or quatemary ammonium salt of diethylamino ethyl acrylate. 
     
     
         8 . The method of  claim 4 , wherein the polymer emulsifier comprises glyoxal cross-linked dimethyldiallylammonium chloride acrylamide, a copolymer of methylacrolyloxyethyltrimethylammonium chloride and acrylamide, or a combination thereof. 
     
     
         9 . The method of  claim 1 , wherein the weight ratio of the hydroxyl-containing hydrocarbon natural polymer polysaccharide compound to the paper-making filler particles in the paper-making filler particles modified by the hydroxyl-containing hydrocarbon natural polymer polysaccharide compound is from 0.1:100 to 5:100. 
     
     
         10 . A process for paper-making comprising:
 combining paper-making filler particles modified by a hydroxyl-containing hydrocarbon natural polymer polysaccharide compound, an alkenyl succinic anhydride emulsified with a polymer emulsifier, and pulp slurry to obtain a paper stock;   forming the paper stock to obtain a wet paper web;   pressing and draining the wet paper web to obtain a wet paper sheet; and   drying the wet paper sheet to obtain a paper sheet.   
     
     
         11 . The process of  claim 10 , wherein the hydroxyl-containing hydrocarbon natural polymer polysaccharide compound comprises cooked cationic starch, cooked native starch, cellulose, cationic cellulose, chitosan, cationic chitosan, guar gum and cationic guar gum, or a combination thereof. 
     
     
         12 . The process of  claim 10 , wherein the paper-making filler particles are calcium carbonate particles. 
     
     
         13 . The process of  claim 10 , wherein the polymer emulsifier comprises a copolymer of acrylamide and a cationic monomer, a copolymer of glyoxal cross-linked acrylamide and a cationic monomer, or a combination thereof. 
     
     
         14 . The process of  claim 13 , wherein the polymer emulsifier is a copolymer of acrylamide and a cationic monomer having a weight average molecular weight of 10000 to 1000000 Dalton. 
     
     
         15 . The process of  claim 13 , wherein the polymer emulsifier is a copolymer of glyoxal cross-linked acrylamide and a cationic monomer having a weight average molecular weight of 100,000-3,000,000 Dalton. 
     
     
         16 . The process of  claim 13 , wherein the cationic monomer comprises dimethyldiallylammonium chloride, methylacrolyloxyethyltrimethyl ammonium chloride, N,N,N-trimethyl-3-(2-methylallylamido)-1-propylammonium chloride, N,N′-dimethylamino ethyl methacrylate, quatemary ammonium salt cation of N,N′-dimethylamino ethyl methacrylate, dimethylamino ethyl acrylate, quatemary ammonium salt of dimethylamino ethyl acrylate, diethylamino ethyl acrylate, or quatemary ammonium salt of diethylamino ethyl acrylate. 
     
     
         17 . The process of  claim 13 , wherein the polymer emulsifier comprises glyoxal cross-linked dimethyldiallylammonium chloride acrylamide, a copolymer of methylacrolyloxyethyltrimethylammonium chloride and acrylamide, or a combination thereof. 
     
     
         18 . The process of  claim 10 , wherein the weight ratio of the hydroxyl-containing hydrocarbon natural polymer polysaccharide compound to the paper-making filler particles in the paper-making filler particles modified by a hydroxyl-containing hydrocarbon natural polymer polysaccharide compound is from 0.1:100 to 5:100. 
     
     
         19 - 20 . (canceled) 
     
     
         21 . A modified paper-making filler particle comprising:
 a core formed by an individual paper-making filler particle or an aggregate of paper-making filler particles, the core having an outer surface; and   a covering layer comprising hydroxyl-containing hydrocarbon natural polymer polysaccharide, wherein the covering layer substantially covers the outer surface of the core,   wherein the weight ratio of the hydroxyl-containing hydrocarbon natural polymer polysaccharide to the modified paper-making filler particle is 0.1:100-5:100.   
     
     
         22 . The modified paper-making filler particle of  claim 21 , wherein the hydroxyl-containing hydrocarbon natural polymer polysaccharide is selected from cooked cationic starch, cooked native starch, cellulose, cationic cellulose, chitosan, cationic chitosan, guar gum and cationic guar gum, and combinations thereof. 
     
     
         23 . The modified paper-making filler particle of  claim 21 , wherein the core comprises a calcium carbonate particle. 
     
     
         24 . (canceled)