| 摘要 |
<p>A liquid for removing printing and screen printing inks consists of an essentially anhydrous mixture of (a) η-butyrolactone and/or N-methyl-2-pyrrolidone in an amount of up to 25 % (v/v) and/or (b) propylene carbonate in an amount of up to 90 % (v/v), and (c) up to 91 % (v/v) of a high-boiling aromatic compound or a mixture of such compounds having a relative evaporation rate with respect to n-butyl acetate of 0.01 or less, and optionally (d) one or more propylene glycol derivatives selected among substituted propyl acetates of general formula (I), wherein R is hydrogen or alkyl having from 1 to 6 carbon atoms, and/or propylene glycol ethers of general formula (II), wherein R1 is alkyl having from 1 to 6 carbon atoms, and n is 1, 2 or 3, and optionally (e) one or more aliphatic diluents having a flash point above 22°C and/or (f) a surfactant. Such a liquid can remove all printing and screen printing inks, and it is considerably less unhealthy than the known cleaning liquids.</p> |
