Claims
- 1. A pulp composition for paper production incorporating in said pulp composition 0.01 to 0.2% by weight, based on the amount of pulp, of an additive for paper production which comprises an amphoteric polymeric electrolyte having as an essential component thereof a structural unit represented by the following general formula I: ##STR3## wherein n is an integer in the range of 1 to 5, R.sup.1, R.sup.2 and R.sup.3 are independently a hydrogen atom or an alkyl group, R.sup.4 is a hydrogen atom, an alkyl group, or a hydroxyalkyl group, and a and b are jointly relative numerals such that the a/b ratio is in the range of 0.2 to 45.0, having at least part of the amino group of said amphoteric polymeric electrolyte neutralized and possessing a cation equivalent amount (Cv) in the range of 1.0 to 15.0 meq/g, an anion equivalent amount (Av) in the range of 0.1 to 7.0 meq/g, and a Cv/Av ratio in the range of 0.2 to 45.0, said amphoteric polymer electrolyte being obtained by (A) allowing a vinyl carboxylic acid monomer to react with an alkylene imine to form an aminoalkyl ester monomer, copolymerizing a salt of said aminoalkyl ester monomer with a vinyl carboxylic acid monomer; or (B) polymerizing a vinyl carboxylic acid monomer, amino-alkylating the resulting vinyl carboxylic acid polymer with alkylene imine at a temperature of 65.degree. C., and then, neutralizing the product with acid; or (C) allowing a vinyl carboxylic acid monomer with an alkylene imine, emulsifying as a water-in-oil type the resultant salt of aminoalkyl ester monomer and a vinyl carboxylic acid monomer emulsion in the presence of water, surfactant and hydrophobic organic solvent, and then, copolymerizing the product; or (D) emulsifying as a water-in-oil type emulsion a vinyl carboxylic acid in the presence of water, surfactant and hydrophobic organic solvent, polymerizing the resulting vinyl carboxylic acid emulsion, amino-alkylating the resulting vinyl carboxylic acid polymer emulsion with an alkylene imine at a temperature of not higher than 65.degree. C., and then, neutralizing the product with acid.
- 2. A composition according to claim 1, wherein a viscosity of an aqueous 10% solution of said polymeric electrolyte molecular weight of said amphoteric polymeric (Brookfield viscosity at pH 3.5 and 25.degree. C.) is in the range of 50 to 100,000 cps.
- 3. A composition according to claim 1, wherein said cation equivalent amount (Cv) is in the range of 3.0 to 12.0 meq/g, said anion equivalent amount (Av) is in the range of 0.2 to 6.0 meq/g, and said Cv/Av ratio is in the range of 0.5 to 40.0.
- 4. A pulp composition for paper production as set forth in claim 16 wherein the amphoteric polymeric electrolyte is contained in a water-in-oil type amphoteric copolymer.
- 5. A composition according to claim 1, wherein a viscosity of an aqueous 10% solution of said polymeric electrolyte molecular weight of said amphoteric polymeric (Brookfield viscosity at pH 3.5 and 25.degree. C.) is in the range of 50 to 100,000 cps.
- 6. Paper, produced by molding in the form of sheet the pulp for paper production set forth in claim 1.
- 7. Paper, produced by molding in the form of a sheet the pulp for paper production set forth in claim 1, wherein a viscosity of an aqueous 10% solution of said polymeric electrolyte molecular weight of said amphoteric polymeric (Brookfield viscosity at pH 3.5 and 25.degree. C.) is in the range of 50 to 100,000 cps.
- 8. Paper, produced by molding in the form of a sheet the pulp for paper production set forth in claim 1, wherein said cation equivalent amount (Cv) is in the range of 3.0 to 12.0 meq/g, said anion equivalent amount (Av) is in the range of 0.2 to 6.0 meq/g and said Cv/Av ratio is in the range of 0.5 to 40.0.
- 9. Paper, produced by molding in the form of a sheet the pulp for paper production set forth in claim 16, wherein the amphoteric polymeric electrolyte is contained in a water-in-oil type amphoteric copolymer.
- 10. Paper, produced by molding in the form of a sheet the pulp for paper production set forth in claim 1, wherein the amphoteric polymeric electrolyte is contained in a water-in-oil type amphoteric copolymer and wherein the cation equivalent amount (Cv) is in the range of 3.0 to 12.0 meq/g, said anion equivalent amount (Av) is in the range of 0.2 to 6.0 meq/g, and said Cv/Av ratio is in the range of 0.5 to 40.0.
Priority Claims (2)
Number |
Date |
Country |
Kind |
1-200342 |
Aug 1989 |
JPX |
|
1-296239 |
Nov 1989 |
JPX |
|
Parent Case Info
This application is a division of application Ser. No. 07/561,931 filed Aug. 2, 1990, now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (3)
Number |
Date |
Country |
387567 |
Sep 1990 |
EPX |
2503169 |
Jun 1976 |
DEX |
62-205112 |
Sep 1987 |
JPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
561931 |
Aug 1990 |
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