Claims
- 1. A water base ink composition for directly feeding to a pen body of a ball-point pen comprising a dye in the range of 3% to 10%, by weight as the sole colorant; humectant in the range of 10% to 40%, by weight; thixotropic agent in the range of 0.6% to 1.0%, by weight, said thixotropic agent being composed of a cross-linkable acrylic acid polymer having a number average molecular weight ranging from 2,000,000 to 6,000,000; and water as the balance, wherein said ink has a metal ion concentration of 0.075% to less than 0.45%.
- 2. The water base ink composition as claimed in claim 1 further comprising a anti-drip agent in the range of 0.3% to 0.5%, by weight.
- 3. The water base ink composition as claimed in claim 1 further comprising anti-corrosive lubricant in the range of 0.2% to 2%, by weight.
- 4. The water base ink composition as claimed in claim 1 further comprising a water-proofing agent in the range of 0.5% to 5%, by weight.
- 5. The water base ink composition as claimed in claim 1 further comprising a pH modifier in the range of 1% to 6%, by weight.
- 6. The water base ink composition as claimed in claim 1 further comprising a bacteriostat in the range of 1% to 2%, by weight.
- 7. The water base ink composition as claimed in claim 1, wherein said humectant is selected from the group consisting of dihydric alcohol, trihydric alcohol.
- 8. The water base ink composition as claimed in claim 1, wherein said humectant is selected from the group consisting of ethylene glycol and polyethylene glycol.
- 9. The water base ink composition as claimed in claim 1, wherein said anti-drip agent is a water-soluble resin having film-forming properties.
- 10. The water base ink composition as claimed in claim 1, wherein said anti-drip agent is a copolymer of polyethylene and polyethylene glycol.
- 11. The water base ink composition as claimed in claim 1, wherein said anti-corrosive lubricant is selected from the group consisting of phosphate surfactants, benzotriazole and fatty acid esters.
- 12. The water base ink composition as claimed in claim 1, wherein said water-proofing agent is selected from the group consisting of polyethyleneimine and polyallylamine.
- 13. The water base ink composition as claimed in claim 1, wherein said pH modifier is triethanolamine.
- 14. The water base ink composition as claimed in claim 1 which has a thixotropic behavior such that when the ink is at rest it is a gel and when subject to shear said ink becomes a liquid.
Priority Claims (1)
Number |
Date |
Country |
Kind |
4-257093 |
Aug 1992 |
JPX |
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Parent Case Info
This application is a continuation-in-part of application Ser. No. 08/095,372, filed Jul. 23, 1993, now abandoned, which application is entirely incorporated herein by reference.
US Referenced Citations (6)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1199004 |
Jul 1970 |
GBX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
095372 |
Jul 1993 |
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