Erasable inks containing thermoplastic block copolymers

Details Erasable inks containing thermoplastic block copolymers Erasable inks containing thermoplastic block copolymers

1981-11-05

1983-06-28

Marquls, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

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

Patent

active

043906460

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.

REFERENCES:
patent: T959010 (1977-06-01), Hansen
patent: 3875105 (1975-04-01), Daugherty
patent: 4059554 (1977-11-01), Pacansky
patent: 4097290 (1978-06-01), Muller et al.
patent: 4244862 (1981-01-01), Handa et al.
Derwent Abst., 76579X/451 Taguchi (J51096626), 8-25-76.
Derwent Abst., 88825C/50 Denki Kagaku Kogyo (J55137166), Oct. 25, 1980.

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