Sizing agent for use in making paper

Claim 1

A method of producing a sizing agent for making paper comprising the steps of: preparing a water-soluble cationic copolymer compound by reacting a first monomeric material containing a predominant amount of a compound of the formula ##STR11## and a minor amount of a compound of the formula ##STR12## the symbols in the two formula being defined as R is hydrogen or CH 3 , X is a halogen atom, A is a (C 2 -C 6 ) alkylene group, Y is a halogen ion or an anion of acid salt such as phosphate, acid phosphate, sulfate, bisulfate, methyl sulfate, sulfonate, sulfamate, acetate, formate, oxalate, acrylate, or α-methacryloxyacetate, with a second monomer of the formula ##STR13## wherein R 1 and R 2 are H or CH 3 , for about five hours at pH 6-5 and 80°-85° C.; and dispersing in an aqueous emulsion dispersion of said copolymer compound a polymerizable hydrophobic monomer of said second monomer at a ratio of 1:1-1:4 (by weight) causing the resultant dispersion to react at pH 6 or less and 70°-80° C. for six hours by using a polymerization initiator to subject said dispersion to a radical emulsion polymerization.

Claim 2

A method of producing a sizing agent for making paper comprising the steps of: preparing a water-soluble cationic copolymer compound by reacting a first monomeric material containing a predominant amount of a compound of the formula ##STR11## and a minor amount of a compound of the formula ##STR12## the symbols in the two formula being defined as R is hydrogen or CH 3 , X is a halogen atom, A is a (C 2 -C 6 ) alkylene group, Y is a halogen ion or an anion of acid salt such as phosphate, acid phosphate, sulfate, bisulfate, methyl sulfate, sulfonate, sulfamate, acetate, formate, oxalate, acrylate, or α-methacryloxyacetate, with a second monomer of the formula ##STR13## wherein R 1 and R 2 are H or CH 3 , for about five hours at pH 6-5 and 80°-85° C.; and dispersing in an aqueous emulsion dispersion of said copolymer compound a polymerizable hydrophobic monomer of said second monomer at a ratio of 1:1-1:4 (by weight) causing the resultant dispersion to react at pH 6 or less and 70°-80° C. for six hours by using a polymerization initiator to subject said dispersion to a radical emulsion polymerization.

Claim 3

A method of producing a sizing agent for making paper comprising the steps of: preparing a water-soluble cationic copolymer compound by reacting a first monomeric material containing a predominant amount of compound of the formula ##STR14## and a minor amount of a compound of the formula ##STR15## the symbols in the two formula being defined as R is hydrogen or CH 3 , X is a halogen atom, A is a (C 2 -C 6 ) alkylene group, Y is a halogen ion or an anion of acid salt such as phosphate, acid phosphate, sulfate, bisulfate, methyl sulfate, sulfonate, sulfamate, acetate, formate, oxalate, acrylate, or α-methacryloxyacetate, with a second monomer of the formula ##STR16## wherein R 1 and R 2 are H or CH 3 , for about five hours at 80°-85° C.; adding to said copolymer compound a small amount of an auxiliary emulsifying agent given by the formula R.sup.3 --O--(CH.sub.2 --CH.sub.2 --O).sub.n SO.sub.3 M (4) wherein R 3 is a higher aliphatic or cycloaliphatic hydrocarbon residue, n is an integer equal to or larger than 2, and M is a monovalent metallic element or NH 4 , to prepare an aqueous emulsion dispersion; and adding to said aqueous emulsion dispersion a polymerizable hydrophobic monomer of said second monomer at the ratio of 1:1-1:4 (by weight) of said copolymer compound and subjecting the resultant dispersion to the polymerization reaction in the existence of aqueous solution of hydrogen peroxide for six hours at 70°-80° C.

Claim 4

A method of producing a sizing agent for making paper comprising the steps of: preparing a water-soluble cationic copolymer compound by reacting a first monomeric material containing a predominant amount of compound of the formula ##STR14## and a minor amount of a compound of the formula ##STR15## the symbols in the two formula being defined as R is hydrogen or CH 3 , X is a halogen atom, A is a (C 2 -C 6 ) alkylene group, Y is a halogen ion or an anion of acid salt such as phosphate, acid phosphate, sulfate, bisulfate, methyl sulfate, sulfonate, sulfamate, acetate, formate, oxalate, acrylate, or α-methacryloxyacetate, with a second monomer of the formula ##STR16## wherein R 1 and R 2 are H or CH 3 , for about five hours at 80°-85° C.; adding to said copolymer compound a small amount of an auxiliary emulsifying agent given by the formula R.sup.3 --O--(CH.sub.2 --CH.sub.2 --O).sub.n SO.sub.3 M (4) wherein R 3 is a higher aliphatic or cycloaliphatic hydrocarbon residue, n is an integer equal to or larger than 2, and M is a monovalent metallic element or NH 4 , to prepare an aqueous emulsion dispersion; and adding to said aqueous emulsion dispersion a polymerizable hydrophobic monomer of said second monomer at the ratio of 1:1-1:4 (by weight) of said copolymer compound and subjecting the resultant dispersion to the polymerization reaction in the existence of aqueous solution of hydrogen peroxide for six hours at 70°-80° C.