Ballpoint pen containing an aqueous ink composition

Details Ballpoint pen containing an aqueous ink composition Ballpoint pen containing an aqueous ink composition

1995-05-19

1997-03-11

Bratlie, Steven A.

Coating implements with material supply

Including ball, roller or endless-belt tool

Ball

401216, B43K 700, B43K 708, B43K 710

Patent

active

056094329

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 .mu.m. 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 .mu.m.

REFERENCES:
patent: 4471079 (1984-09-01), Enami

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