Water-based ink composition for ballpoint pen and ballpoint...

Details Water-based ink composition for ballpoint pen and ballpoint... Water-based ink composition for ballpoint pen and ballpoint...

2005-09-15

2008-10-28

Walczak, David J (Department: 3751)

Coating implements with material supply

Including ball, roller or endless-belt tool

Ball

C401S141000, C106S031130, C106S031680

Reexamination Certificate

active

07441976

ABSTRACT:
A water-based ink composition for ballpoint pen, which comprises at least a colorant, water, a shear-thinning tackifier and a thickening inhibitor, wherein a ratio (x) of a viscosity after evaporation of 40 wt % of water from the total ink amount to an initial ink viscosity (as measured by EMD viscometer at 1 rpm and 20° C.) is 2 or less; and a ballpoint pen comprising the same.

REFERENCES:
patent: 5466281 (1995-11-01), Hanke et al.
patent: 6340261 (2002-01-01), Furukawa
patent: 6616741 (2003-09-01), Sawa et al.
patent: 2002/0033117 (2002-03-01), Inoue et al.
patent: 59-74175 (1984-04-01), None
patent: WO 2004/011558 (2004-02-01), None
European Search Report dated Jul. 25, 2007.

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