Water base erasable ink composition for use in marking pens

Details Water base erasable ink composition for use in marking pens Water base erasable ink composition for use in marking pens

2008-07-08

2008-07-08

Lorengo, Jerry A. (Department: 1793)

Compositions: coating or plastic

Coating or plastic compositions

Marking

C106S031860

Reexamination Certificate

active

07396400

ABSTRACT:
A water base erasable ink composition for use in marking pens which comprises 0.05-20% by weight of a colorant and 1-20% by weight of an oily material which is nonvolatile at normal temperatures (25° C.) and is dispersed in water, wherein the oily material has a viscosity of 5-40 mPa·s at 20° C. and is dispersed in water in the form of emulsion, and wherein the colorant is dispersed in the water with the aid of a polyvinyl alcohol resin as a dispersing agent which has a saponification degree of 70-85 mol % and of which aqueous solution of 4% concentration has a viscosity of 2-30 mPa·s at 20° C. in a weight ratio of the resin to the colorant of 0.5 to 5 and in an amount of 1 to 10% by weight based on the ink composition.

REFERENCES:
patent: 5677363 (1997-10-01), Imagawa
patent: 5854320 (1998-12-01), Nakamura et al.
patent: 6666913 (2003-12-01), Hirano et al.
patent: 10025443 (1998-01-01), None
English machine translation of JP 10-025443 A.

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