Ink follower for water-based ink ballpoint pen

Details Ink follower for water-based ink ballpoint pen Ink follower for water-based ink ballpoint pen

2007-02-20

2007-02-20

Walczak, David J. (Department: 3751)

Coating implements with material supply

Including floating follower in reservoir

Fluid follower

C401S141000

Reexamination Certificate

active

10499966

ABSTRACT:
An ink follower for a ballpoint pen using a water-based ink in which a value of the test for oil separation (60° 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 δ of 0.1 to 1.5 at a temperature of 25° 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 Pas·sec or less at a temperature of 25° C. and a shearing speed of 1 to 400 sec−1. Polybutene, mineral oil and silicone oil can be used as the base oil.

REFERENCES:
patent: 4671691 (1987-06-01), Case et al.
patent: 61-39580 (1986-11-01), None
patent: 3016749 (1998-12-01), None
patent: 2000-301880 (2000-10-01), None
patent: 2001-353993 (2001-12-01), None
English translation of International Preliminary Examination Report from corresponding PCT Application No. PCT/JP02/013825 filed Dec. 27, 2002.

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