| 摘要 |
<p>PURPOSE:To obtain a photocurable oligomer which gives a printing ink excellent in gloss, pigment dispersion, printability, etc., by reacting a specific compd. with rosin. CONSTITUTION:A photocurable oligomer is prepd. by reacting a compd. of formula I (wherein R is H or CH3) (e.g. a compd. of formula II or III) with rosin. The type of rosin used is determined considering the rate of ultraviolet curing of the resulting ink, the hue of the oligomer, etc., and usually rosins with conjugated double bonds stabilized, such as a hydrogenated rosin or a disproportionated rosin, are suitable. The oligomer can be used for various applications by utilizing its photocurability and gives, when used as a binder, a printing ink excellent in gloss, pigment dispersion, printability, etc.,in comparison with conventional solvent-based printing inks.</p> |
