| 摘要 |
A printing ink for printing on polyvinyl butyral sheet material comprises a polyvinyl butyral resin, an alcohol, ketone, chlorinated hydrocarbon or aromatic hydrocarbon solvent therefor, and a light-stable dyestuff soluble in a ketone or chlorinated hydrocarbon, containing from 2-4 cyclic nuclei in the molecule, the ink having a viscosity of from 10 to 500 centipoises. Specified solvents are cyclohexanone, solvent naphthas, ethanol and n-butanol. Specified dyestuffs are substituted anthraquinone dyes such as Ero blue and cobalt blue, Kohnstamm orange, oil orange, and calco-oil yellow. A plasticizer such as triethyleneglycol di(2-ethyl butyrate), dibutyl sebacate and di(b -butoxyethyl) phthalate may also be present.
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