Aqueous gel ballpoint pen and method for the production thereof
AssigneeZebra Co., Ltd.
InventorMasafumi Yoshikawa
Life of this patent
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Abstract
An aqueous gel ballpoint pen 1 having an ink-storage tube storing an aqueous gel ink containing a pigment as a coloring agent, and a ballpoint pen tip having a ball rotatably held at its leading end and also having an ink flow pore which is formed so that the aqueous gel ink flows from the ink-storage tube to the ball, wherein an ink flow pore diameter r (unit: mm) in the ballpoint pen tip and a storage modulus G′ (unit: Pa) at 20° C. of the aqueous gel ink satisfy conditions represented by the following formulas (1) and (2): 0.24≦r≦0.64 (1), and 1.3≦G′≦16r−3.2 (2).
Claims4
An aqueous gel ballpoint pen comprising an ink-storage tube storing an aqueous gel ink containing a pigment as a coloring agent, and a ballpoint pen tip having a ball rotatably held at its leading end and also having an ink flow pore which is formed so that said aqueous gel ink flows from said ink-storage tube to the ball,
- wherein an ink flow pore diameter r (unit:
- mm) in said ballpoint pen tip and a storage modulus G′ (unit:
- Pa) at 20° C. of said aqueous gel ink satisfy conditions represented by the following formulas (1) and (2):
- 0.24≦r≦0.64 (1), and
- 1.3≦G′≦16r−3.2 (2).
An aqueous gel ballpoint pen comprising an ink-storage tube storing an aqueous gel ink containing only a dye as a coloring agent, and a ballpoint pen tip having a ball rotatably held at its leading end and also having an ink flow pore which is formed so that said aqueous gel ink flows from said ink-storage tube to the ball,
- wherein an ink flow pore diameter r (unit:
- mm) in said ballpoint pen tip and a storage modulus G′ (unit:
- Pa) at 20° C. of said aqueous gel ink satisfy conditions represented by the following formulas (3) and (4):
- 0.24≦r≦0.64 (3), and
- 0<G′≦16r−3.2 (4).
A method for producing an aqueous gel ballpoint pen comprising an ink-storage tube storing an aqueous gel ink containing a pigment as a coloring agent, and a ballpoint pen tip having a ball rotatably held at its leading end and also having an ink flow pore which is formed so that said aqueous gel ink flows from said ink-storage tube to the ball,
- wherein the method comprises a step of preparing said aqueous gel ink so that an ink flow pore diameter r (unit:
- mm) in said ballpoint pen tip and a storage modulus G′ (unit:
- Pa) at 20° C. of said aqueous gel ink satisfy conditions represented by the following formulas (1) and (2):
- 0.24≦r≦0.64 (1), and
- 1.3≦G′≦16r−3.2 (2).
A method for producing an aqueous gel ballpoint pen comprising an ink-storage tube storing an aqueous gel ink containing only a dye as a coloring agent, and a ballpoint pen tip having a ball rotatably held at its leading end and also having an ink flow pore which is formed so that said aqueous gel ink flows from said ink-storage tube to the ball,
- wherein the method comprises a step of preparing said aqueous gel ink so that an ink flow pore diameter r (unit:
- mm) in said ballpoint pen tip and a storage modulus G′ (unit:
- Pa) at 20° C. of said aqueous gel ink satisfy conditions represented by the following formulas (3) and (4):
- 0.24≦r≦0.64 (3), and
- 0<G′≦16r−3.2 (4).
Dependencies are inferred from the claim text.