Erasable inks containing thermoplastic block copolymers

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...

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524505, 525 89, 525 95, 525 96, 525 98, 525 99, 525901, C09D 1118, C08K 501, C08L 5300

Patent

active

043919278

ABSTRACT:
An erasable ink containing a thermoplastic block copolymer, pigment particles, and a solvent. In a preferred embodiment, an erasable ink requiring little or no pressurization is provided by employing a mixture of radial and linear block copolymers and a mixed solvent system falling within a specific range of solubility parameter. Polybutene and poly-alpha-methylstyrene are preferred additives to decrease smearing tendency.

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