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Ballpoint pen containing an aqueous ink composition

  • US 5,609,432 A
  • Filed: 05/19/1995
  • Issued: 03/11/1997
  • Est. Priority Date: 12/16/1994
  • Status: Expired due to Term
First Claim
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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.

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