Erasable ink composition containing a waterborne polyurethane urea
AssigneeBIC Corporation
InventorsJeffery H. Banning, Wayne A. Chandler, David C. Villiger, Aiying Wang, Barry W. Chadwick
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Abstract
An erasable ink composition contains a water-insoluble polymeric dye obtained from the polymerization of at least two coreactive polyfunctional monomers with at least one of the monomers possessing a dye moiety covalently bonded thereto. The ink is intended for use in any of a variety of marking instruments, in particular, a ball-point pen.
Claims22
An erasable ink composition which comprises a waterborne polyurethane-urea obtained by effecting polymerization of a waterborne polyurethane-urea-forming reaction medium containing at least two coreactive polyfunctional monomers, said waterborne polyurethane urea containing dye moiety covalently bonded thereto, 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.
Dependencies are inferred from the claim text.