Aqueous ink composition for ball-point pen

• US 6,331,203 B2
• Filed: 04/30/2001
• Issued: 12/18/2001
• Est. Priority Date: 03/17/1999
• Status: Expired due to Fees

• Current Assignee: Kotobuki & Co., Ltd.
• Original Assignee: Kotobuki & Co., Ltd.
• Inventors: Nakamura, Akio, Hattori, Katsuya, Morishita, Mikio
• Primary Examiner(s): Acquah, Samuel A.
• Application Number:
  US09/843,920
• Publication Number:
  US 20010023651A1
• Time in Patent Office: 232 Days
• Field of Search: 106/31.13, 106/31.25, 106/31.26, 106/31.28, 106/31.29, 106/31.31, 106/31.36, 106/31.37, 106/31.38, 106/31.39, 106/31.44, 106/31.45, 106/31.48, 106/31.57, 106/31.58, 106/31.59, 524/35, 524/55, 524/56, 524/60, 524/61, 524/81
• US Class Current: 106/31.13
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C09D 105/00 Coating compositions based on polysaccharides or on their derivatives, not provided for in groups C09D101/00 or C09D103/00
• CPC Class Codes: C09D 105/04 Alginic acid; Derivatives thereof
• CPC Class Codes: C09D 11/18 specially adapted for ball-point writing instruments

Abstract

An aqueous ink for a ball-point pen which is stable over time and has high pigment dispersion stability, includes a pigment, a water-soluble organic solvent, water, xanthane gum of about 0.01 to about 0.2 wt. % and a sodium alginate of about 0.2 to about 0.6 wt. % of a total amount of the ink.

Claims

1. An aqueous ink for a ball-point pen, comprising:

a pigment;

a water-soluble organic solvent;

water;

xanthane gum; and

an ionic polysaccharide other than xanthane gum,

wherein said xanthane gum and said ionic polysaccharide are balanced such that said aqueous ink has high stability over time, high pigment dispersion stability, and proper, viscosity.

2. The aqueous ink as claimed in claim 1, wherein a xanthane gum content and an ionic polysaccharide content are substantially about 0.01 to about 0.2 wt. % and about 0.2 to about 0.6 wt. % in the total amount of the ink, respectively.

3. The aqueous ink as claimed in claim 1, wherein said ionic polysaccharide comprises a sodium alginate.

4. The aqueous ink as claimed in claim 2, wherein said ionic polysaccharide comprises a sodium alginate.

5. The aqueous ink as claimed in claim 2, wherein a water content is substantially about 35 to about 49 wt. % in the total amount of the ink.

6. The aqueous ink as claimed in claim 4, wherein a water content is substantially about 35 to about 49 wt. % in the total amount of the ink.

7. The aqueous ink as claimed in claim 1, wherein said ionic polysaccharide comprises at least one substance selected from a group consisting of a natural Arabic gum, casein, gelatin, carrageenan, alginic acid, semi-synthetic carboxymethyl cellulose, sodium carboxymethylstarch, synthetic sodium polyacrylate, and polyacrylic acid.

8. The aqueous ink as claimed in claim 2, wherein said ionic polysaccharide comprises at least one substance selected from a group consisting of a natural Arabic gum, casein, gelatin, carrageenan, alginic acid, semi-synthetic carboxymethyl cellulose, sodium carboxymethylstarch, synthetic sodium polyacrylate, and polyacrylic acid.

9. The aqueous ink as claimed in claim 5, wherein said ionic polysaccharide comprises at least one substance selected from a group consisting of a natural Arabic gum, casein, gelatin, carrageenan, alginic acid, semi-synthetic carboxymethyl cellulose, sodium carboxymethylstarch, synthetic sodium polyacrylate, and polyacrylic acid.

10. The aqueous ink as claimed in claim 1, wherein said pigment comprises an inorganic pigment.

11. The aqueous ink as claimed in claim 2, wherein said pigment comprises an inorganic pigment.

12. The aqueous ink as claimed in claim 4, wherein said pigment comprises an inorganic pigment.

13. The aqueous ink as claimed in claim 1, wherein said pigment comprises an organic pigment.

14. The aqueous ink as claimed in claim 2, wherein said pigment comprises an organic pigment.

15. The aqueous ink as claimed in claim 4, wherein said pigment comprises an organic pigment.

16. The aqueous ink as claimed in claim 10, wherein said inorganic pigment comprises at least one substance selected from a group consisting of titanium oxide, carbon black, and metal powder.

17. The aqueous ink as claimed in claim 11, wherein said inorganic pigment comprises at least one substance selected from a group consisting of titanium oxide, carbon black, and metal powder.

18. The aqueous ink as claimed in claim 12, wherein said inorganic pigment comprises at least one substance selected from a group consisting of titanium oxide, carbon black, and metal powder.

19. The aqueous ink as claimed in claim 13, wherein said organic pigment comprises at least one substance selected from a group consisting of azo-lake, insoluble azo-pigment, chelate azo-pigment, phthalocyanine pigment, perylene and perinone pigments, anthraquinone pigment, quinacridone pigment, lake pigment, nitro pigment, and nitroso-pigment.

20. The aqueous ink as claimed in claim 14, wherein said organic pigment comprises at least one substance selected from a group consisting of azo-lake, insoluble azo-pigment, chelate azo-pigment, phthalocyanine pigment, perylene and perinone pigments, anthraquinone pigment, quinacridone pigment, lake pigment, nitro pigment, and nitroso-pigment.

21. The aqueous ink as claimed in claim 15, wherein said organic pigment comprises at least one substance selected from a group consisting of azo-lake, insoluble azo-pigment, chelate azo-pigment, phthalocyanine pigment, perylene and perinone pigments, anthraquinone pigment, quinacridone pigment, lake pigment, nitro pigment, and nitroso-pigment.

22. The aqueous ink as claimed in claim 2, wherein a content of said pigment is substantially within the range of about 4 to about 12 wt. %.

23. The aqueous ink as claimed in claim 22, wherein said pigment content is substantially within the range of about 6 to about 8 wt. %.

24. The aqueous ink as claimed in claim 4, wherein a content of said pigment is substantially within the range of about 4 to about 12 wt. %.

25. The aqueous ink as claimed in claim 24, wherein said pigment content is substantially within the range of about 6 to about 8 wt. %.

26. The aqueous ink as claimed in claim 1, wherein said water-soluble organic solvent comprises at least one substance selected from a group consisting of glycerin, diglycerin, ethylene glycol, diethylene glycol, tridiethylene glycol, propylene glycol, polyethylene glycol, polypropylene glycol, thiodiglycol, 1-3-butylene glycol, 2-pyrrolidone, n-methyl-2-pyrrolidone, dimethylformamide, and dimethylimidazolidinone.

27. The aqueous ink as claimed in claim 2, wherein said water-soluble organic solvent comprises at least one substance selected from a group consisting of glycerin, diglycerin, ethylene glycol, diethylene glycol, tridiethylene glycol, propylene glycol, polyethylene glycol, polypropylene glycol, thiodiglycol, 1-3-butylene glycol, 2-pyrrolidone, n-methyl-2-pyrrolidone, dimethylformamide, and dimethylimidazolidinone.

28. The aqueous ink according to claim 4, wherein said water-soluble organic solvent comprises at least one substance selected from a group consisting of glycerin, diglycerin, ethylene glycol, diethylene glycol, tridiethylene glycol, propylene glycol, polyethylene glycol, polypropylene glycol, thiodiglycol, 1-3-butylene glycol, 2-pyrrolidone, n-methyl-2-pyrrolidone, dimethylformamide, and dimethylimidazolidinone.

29. The aqueous ink as claimed in claim 1, further including at least one of a surface active agent, an antiseptic agent, a pH adjuster, an anticorrosion agent, and a dispersion agent.

30. The aqueous ink as claimed in claim 2, further including at least one of a surface active agent, an antiseptic agent, a pH adjuster, an anticorrosion agent, and a dispersion agent.

31. The aqueous ink as claimed in claim 4, further including at least one of a surface active agent, an antiseptic agent, a pH adjuster, an anticorrosion agent, and a dispersion agent.

32. The aqueous ink as claimed in claim 29, wherein said pH adjuster includes at least one of monoethanol amine, diethanol amine, triethanol amine, sodium hydroxide, lithium hydroxide, potassium hydroxide, sodium tripolyphosphate, sodium carbonate, urea, and ammonia.

33. The aqueous ink as claimed in claim 30, wherein said pH adjuster includes at least one of monoethanol amine, diethanol amine, triethanol amine, sodium hydroxide, lithium hydroxide, potassium hydroxide, sodium tripolyphosphate, sodium carbonate, urea, and ammonia.

34. The aqueous ink as claimed in claim 31, wherein said pH adjuster includes at least one of monoethanol amine, diethanol amine, triethanol amine, sodium hydroxide, lithium hydroxide, potassium hydroxide, sodium tripolyphosphate, sodium carbonate, urea, and ammonia.

35. The aqueous ink as claimed in claim 29, wherein said anticorrosion agent includes at least one of tolytriazole, benzotriazole and its derivatives, fatty acid phosphorous derivatives including any of octyl phosphate, dioctyl thiophosphate, imidazole, benzoimidazole and its derivative, 2-mercaptobenzothiazole, octyl methane sulfonic acid dicyclohexyl ammonium nitrate, diisopropyl ammonium nitrate, propargyl alcohol, and dialkylthio urea.

36. The aqueous ink as claimed in claim 30, wherein said anticorrosion agent includes at least one of tolytriazole, benzotriazole and its derivatives, fatty acid phosphorous derivatives including any of octyl phosphate, dioctyl thiophosphate, imidazole, benzoimidazole and its derivative, 2-mercaptobenzothiazole, octyl methane sulfonic acid, dicyclohexyl ammonium nitrate, diisopropyl ammonium nitrate, propargyl alcohol, and dialkylthio urea.

37. The aqueous ink as claimed in claim 31, wherein said anticorrosion agent includes at least one of tolytriazole, benzotriazole and its derivatives, fatty acid phosphorous derivatives including any of octyl phosphate, dioctyl thiophosphate, imidazole, benzoimidazole and its derivative, 2-mercaptobenzothiazole, octyl methane sulfonic acid, dicyclohexyl ammonium nitrate, diisopropyl ammonium nitrate, propargyl alcohol, and dialkylthio urea.

38. The aqueous ink as claimed in claim 29, wherein said antiseptic agent includes at least one of phenol, isopropyl methyl phenol, penta chlorophenol sodium, benzoic acid, sodium benzoate, dehydroacetic acid, sodium dehydroacetate, sorbic acid, potassium sorbate, 2-pyridinethiol-1 oxide sodium salt, 1,2-benzoisothiazoline-3-one, 5-chlor-2-methyl-4-isothizoline-3-one, 2,4-thiazolylbenzimidazole, and p-hydroxybenzoate ester.

39. The aqueous ink as claimed in claim 30, wherein said antiseptic agent includes at least one of phenol, isopropyl methyl phenol, penta chlorophenol sodium, benzoic acid, sodium benzoate, dehydroacetic acid, sodium dehydroacetate, sorbic acid, potassium sorbate, 2-pyridinethiol-1 oxide sodium salt, 1,2-benzoisothiazoline-3-one, 5-chlor-2-methyl- 4-isothizoline-3-one, 2,4-thiazolylbenzimidazole, and p-hydroxybenzoate ester.

40. The aqueous ink as claimed in claim 31, wherein said antiseptic agent includes at least one of phenol, isopropyl methyl phenol, penta chlorophenol sodium, benzoic acid, sodium benzoate, dehydroacetic acid, sodium dehydroacetate, sorbic acid, potassium sorbate, 2-pyridinethiol-1 oxide sodium salt, 1,2-benzoisothiazoline-3 -one, 5-chlor-2-methyl-4-isothizoline-3-one, 2,4-thiazolylbenzimidazole, and p-hydroxybenzoate ester.

41. The aqueous ink as claimed in claim 29, wherein said surface active agent includes at least one of potassium linoleic acid, potassium oleate, sodium oleate, polyoxy ethylene alkylether phosphate, polyoxy ethylene alkyl phenyl ether, and polyoxy ethylene lanolin.

42. The aqueous ink as claimed in claim 30, wherein said surface active agent includes at least one of potassium linoleic acid, potassium oleate, sodium oleate, polyoxy ethylene alkylether phosphate, polyoxy ethylene alkyl phenyl ether, and polyoxy ethylene lanolin.

43. The aqueous ink as claimed in claim 31, wherein said surface active agent includes at least one of potassium linoleic acid, potassium oleate, sodium oleate, polyoxy ethylene alkylether phosphate, polyoxy ethylene alkyl phenyl ether, and polyoxy ethylene lanolin.

44. The aqueous ink as claimed in claim 2, wherein said water-soluble organic solvent comprises ethylene glycol and a content of said ethylene glycol is substantially not less than about 11 wt. %.

45. The aqueous ink as claimed in claim 2, wherein said water-soluble organic solvent comprises ethylene glycol and a content of said ethylene glycol is substantially not less than about 11 wt. %.