Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1981-03-25
1982-05-11
Briggs, Sr., Wilbert J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
106 30, 106 32, 260DIG38, 401209, 524526, C09D 336, C08L 900
Patent
active
043292623
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 an elastomer selected from the group consisting of natural rubbers, synthetic rubbers and mixtures thereof, pigment, and a solvent system for said elastomer and pigment. The elastomer is present in the range of about 18-28% by weight of the ink and the pigment is present in the range of about 10-22% by weight of the ink. The solvent system comprises a volatile component present in the range of about 8-30% by weight of the ink and having a boiling point less than about 180.degree. C. and an essentially non-volatile component which is predominantly a low viscosity hydrocarbon oil, essential oil, petroleum derivative, plasticizer or mixtures thereof having a boiling point less than about 300.degree. C. and greater than about 180.degree. C. being present in the range of about 21 to 50.5% by weight of the ink. The solvent system may also include up to 15% by weight of the ink composition of a non-volatile high viscosity material having a boiling point greater than about 300.degree. C.
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Briggs Sr. Wilbert J.
Scripto, Inc.
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