Erasable ink composition containing a polymer-encapsulated colorant derived from monomer containing dissolved colorant
First Claim
1. An erasable ink composition which comprises an aqueous dispersion of a water-insoluble polymer-encapsulated colorant obtained by polymerizing under emulsion polymerization conditions at least one hydrophobic emulsion-polymerizable monomer containing dissolved colorant, the erasable ink composition when applied to a substrate and upon drying thereon exhibiting less than about 30 weight percent flaking based on the weight of the dried ink and an erasability value delta E*ab of less than about 4.0.
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Accused Products
Abstract
An erasable ink composition contains an aqueous dispersion of water-insoluble polymer-encapsulated colorant obtained from the emulsion polymerization of at least one hydrophobic emulsion-polymerizable monomer with at least a portion of the monomer containing colorant dissolved therein. The ink is intended for use in any of a variety of marking instruments, in particular, a ball-point pen.
137 Citations
15 Claims
- 1. An erasable ink composition which comprises an aqueous dispersion of a water-insoluble polymer-encapsulated colorant obtained by polymerizing under emulsion polymerization conditions at least one hydrophobic emulsion-polymerizable monomer containing dissolved colorant, the erasable ink composition when applied to a substrate and upon drying thereon exhibiting less than about 30 weight percent flaking based on the weight of the dried ink and an erasability value delta E*ab of less than about 4.0.
Specification