Method of making and improved compositions for an initially eras

Details Method of making and improved compositions for an initially eras Method of making and improved compositions for an initially eras

1982-05-05

1983-10-04

Marquis, Melvyn I.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

401190, 401209, 524563, 524565, C09D 1118, B41K 700, B43K 710, C08K 501

Patent

active

044079850

ABSTRACT:
An initially erasable ink composition for a ball point writing instrument which ink is characterized by its initial erasability by ordinary pencil erasers when applied by a ball point writing instrument to an absorbent paper-like writing surface and which thereafter develops permanence. The ink composition comprises polar elastomers, such as butadiene/acrylonitrile copolymer rubbers and vinyl acetate/ethylene copolymer rubbers, and mixtures thereof, either alone or in admixture with cis-1, 4-polyisoprene (natural rubber or synthetic nature rubber), pigment, and a solvent system. The polar elastomer is present in the range of about 14-25% by weight of the ink and the pigment is present in amount sufficient to impart color and intensity to a trace of the ink when applied to a substrate such as paper. The solvent system essentially comprises a volatile component having a boiling point less than about 180.degree. C. and an essentially non-volatile component which includes pigment vehicle having a boiling point greater than about 300.degree. C. and low viscosity plasticizer having a boiling point greater than 180.degree. C. but less than 300.degree. C., the solvent system being present in amount sufficient to impart a final ink viscosity in the range of about 1.5 million cps.

REFERENCES:
patent: 4297260 (1981-10-01), Feree et al.
patent: 4329262 (1982-05-01), Muller
patent: 4329264 (1982-05-01), Muller
Derwent Abst. 27627 E/14, Feb. 1982 J5703173 Mitsubishi Pencil.
Derwent Abst. 06981 D/05 Nov. 1981 J55152769 Pilot Pen.
Derwent Abst. 27104 E/14, Feb. 1982 J57034170 Mitsubishi Pencil.
Derwent Abst. 55103 D/30, Jul. 1981 JJP8101858 Pentel KK.
Derwent Abst. 42733 D/24 Apr. 1981, J56043374 Pilot Ink KK.
Derwent Abst. 58013 D/32 Jun. 1981, J56076477 Pentel KK.
Derwent Abst. 74849 D/41 Aug. 1981, J56109265 Pentel KK.

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