发明授权
US5852072A Erasable ink composition containing a waterborne polyurethane urea 失效
含有水性聚氨酯脲的可擦除油墨组合物

Erasable ink composition containing a waterborne polyurethane urea
摘要:
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.
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