Writing board ink composition

Details Writing board ink composition Writing board ink composition

1993-03-29

1994-06-07

Klemanski, Helene

Compositions: coating or plastic

Coating or plastic compositions

Corrosion inhibiting coating composition

106 19F, 106 20A, C09D 1116

Patent

active

053186176

ABSTRACT:
A writing board ink composition comprises a medium formed of a lower alcohol solvent which contains an alcohol-soluble polymer, a scraping (erasing) agent, a surfactant and a diketopyrrolopyrrole pigment having a median Stokes diameter (ultrafine particle size) of not more than 0.2 .mu.m and represented by the following formula ##STR1## R.sup.1 and R.sup.2 independently represent an unsubstituted phenyl or naphthyl group of a non-water-solubilizing substituent substituted phenyl or naphthyl group, and R.sup.3 and R.sup.4 independently represent hydrogen or a non-water-solubilizing substituent. The writing board ink composition remains stable for a long time while in pens even when the resin content (alcohol-soluble polymer) is such that unclear writing and scrapability reduction (loss of scrapability or erasability) can be avoided, since the pigment of ultrafine particle size is fast to lower alcohol solvents.

REFERENCES:
patent: 4193906 (1980-03-01), Hatanaka
patent: 4256494 (1981-03-01), Yamamoto et al.
patent: 4578117 (1986-03-01), Nakanishi
patent: 4740549 (1988-04-01), Okuzono et al.
patent: 4992101 (1991-02-01), Jaffe et al.
patent: 5120359 (1992-06-01), Uzukawa et al.
patent: 5160369 (1992-11-01), Parkinson et al.

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