Ink follower for water-based ink ballpoint pen
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United States of America Patent
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Feb 20, 2007
Grant Date -
Apr 7, 2005
app pub date -
Dec 27, 2002
filing date -
Dec 28, 2001
priority date (Note) -
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Abstract
An ink follower for a ballpoint pen using a water-based ink in which a value of the test for oil separation (60.degree. C., 24 hours) according to JIS K 2220-5.7-1993 is 0.5 to 12% and which has a viscoelasticity predominant in an elastic response or a value of tan .delta. of 0.1 to 1.5 at a temperature of 25.degree. C. and in the full frequency range of an angular frequency of 0.1 to 630 rad/sec, and it contains as a base oil, a non-water-soluble organic solvent having a viscosity of 5 Passec or less at a temperature of 25.degree. C. and a shearing speed of 1 to 400 sec.sup.-1. Polybutene, mineral oil and silicone oil can be used as the base oil.
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