Ball-point writing instrument containing an aqueous ink composition
AssigneeThe Gillette Company
InventorsLaura K. Case, deceased, Chandrasen Gajria, Rachel M. Loftin, Henry Peper
Life of this patent
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Abstract
Aqueous based shear-thinning ink compositions and ball-point pens including the ink compositions. The ink compositions have a shear thinning index of from about 0.01 to about 0.6 and include colorant material(s) and a water dispersible, polymeric shear-thinning material substantially uniformly dispersed in a highly polar solvent system in which water is the primary solvent for the shear-thinning material.
Claims37
A shear-thinning ink composition which does not undergo a significant change in viscosity in response to temperature and which consists essentially of:
- (a) from about 50 to about 99 percent by weight of the total composition weight of a polar solvent system including at least about 50 percent by weight water,
- (b) colorant material, and
- (c) from about 0.7 to about 6 percent by weight of the total composition weight of a water-dispersible, polymeric shear-thinning material said ink composition having a shear-thinning index of from 0.01 to 0.6, a viscosity of 50 cPs or greater at a shear rate of 30 sec.sup.-1 and a viscosity of 100 cPs or less at shear rates produced by writing.
A shear-thinning ink composition consisting essentially of:
- (a) from about 50 to about 99 percent by weight of the total composition weight of a polar solvent system including at least about 50 percent by weight water,
- (b) from about 0.1 to about 30 percent by weight of the total composition weight of colorant material, and
- (c) from about 0.7 to about 6 percent by weight of the total composition weight of a water-dispersible, polymeric shear-thinning material selected from the group consisting of xanthan gum, carrageenan gum, locust bean gum, hydroxyethylcellulose, guar gum or mixtures of these, said ink composition having a shear-thinning index of from 0.01 to 0.6, a viscosity of 50 cPs or greater at a shear rate of 30 sec.sup.-1 and a viscosity of 100 cPs or less at shear rates produced by writing.
A shear-thinning ink composition consisting essentially of:
- (a) from about 50 to about 99 percent by weight of the total composition weight of a polar solvent system including at least about 50 percent by weight water,
- (b) from about 0.1 to about 30 percent by weight of the total composition weight of colorant material, and
- (c) from about 0.7 to about 6 percent by weight of the total composition weight of xanthan gum, said ink composition having a shear-thinning index of from 0.01 to 0.6, a viscosity of 50 cPs or greater at a shear rate of 30 sec.sup.-1 and a viscosity of 100 cPs or less at shear rates produced by writing.
Dependencies are inferred from the claim text.