Ballpoint pen containing an aqueous ink composition
First Claim
1. A ballpoint pen containing an aqueous ink composition obtained by directly filling (A) an aqueous ink comprising (a) an aqueous medium, (b) a pigment and (c) a carboxyl group-containing crosslinked hydrophilic polymer which swells and disperses in a gel state in the form of particles having a particle diameter of 0.5 to 10 μ
- m and which is crosslinked with a crosslinkable monomer having at least two polymerizable unsaturated groups in an amount of 0.5 mol % or more based on the total of a carboxyl group-containing monomer and a copolymerizable monoethylenic monomer used together if desired, into (B) an ink reservoir tube equipped with a ballpoint pen tip in which a clearance between a ball and a ball receiver is in the range of 10 to 40 μ
m.
1 Assignment
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Accused Products
Abstract
A ballpoint pen contains an aqueous ink composition into which ink is directly filled. The pen is free from ink dripping and has improved writing performance. The aqueous ink composition is directly filled into an ink reservoir tube equipped with a ballpoint pen tip. The aqueous ink composition includes (a) an aqueous medium, (b) a pigment and (c) a carboxyl group-containing crosslinked hydrophilic polymer. The hydrophilic polymer swells and disperses in a gel state in the form of particles having a particle diameter of 0.5 to 10 μm. The polymer is crosslinked with a crosslinkable monomer having at least two polymerizable unsaturated groups in an amount of 0.5 mol % or more based on the total of a carboxyl group-containing monomer and a copolymerizable monoethylenic monomer used together, if desired. The ink reservoir tube tip has a clearance between a ball and a ball receiver in the range of 10 to 40 μm.
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Citations
10 Claims
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1. A ballpoint pen containing an aqueous ink composition obtained by directly filling (A) an aqueous ink comprising (a) an aqueous medium, (b) a pigment and (c) a carboxyl group-containing crosslinked hydrophilic polymer which swells and disperses in a gel state in the form of particles having a particle diameter of 0.5 to 10 μ
- m and which is crosslinked with a crosslinkable monomer having at least two polymerizable unsaturated groups in an amount of 0.5 mol % or more based on the total of a carboxyl group-containing monomer and a copolymerizable monoethylenic monomer used together if desired, into (B) an ink reservoir tube equipped with a ballpoint pen tip in which a clearance between a ball and a ball receiver is in the range of 10 to 40 μ
m. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- m and which is crosslinked with a crosslinkable monomer having at least two polymerizable unsaturated groups in an amount of 0.5 mol % or more based on the total of a carboxyl group-containing monomer and a copolymerizable monoethylenic monomer used together if desired, into (B) an ink reservoir tube equipped with a ballpoint pen tip in which a clearance between a ball and a ball receiver is in the range of 10 to 40 μ
Specification