Photo-initiator blends suitable for radiation curable ink formulations are disclosed which comprise a mixture of three or more photo-initiators, said mixture being a liquid at a temperature at or below ambient; the mixture comprising:
(a) a first photo-initiator comprising an optionally substituted hydroxyC1-10 alkylC6-18aryl ketone which is liquid at ambient temperature;
(b) a second photo-initiator comprising an optionally substituted hydroxy(cycloC3-10alkyl)C6-18aryl ketone which is solid at ambient temperature; and
(c) a third photo-initiator comprising an optionally substituted C6-18aryl(((C1-10 alkyl)1-4C6-18arylcarbonyl))1-3 phosphine oxide which is solid at ambient temperature; where
(i) the first photo-initiator (a) and the second photo-initiator (b) are present in the mixture in a weight ratio of from about 0.8 to about 1.2,
(ii) the first photo-initiator (a) and the second photo-initiator (b) together comprise at least about 60% by weight of the total mixture; and
(iii) the third photo-initiator (c) comprises at least about 25 % by weight of the total mixture. Inks comprising such photo-initiator blends are also described.
本发明公开了适用于辐射固化油墨配方的光
引发剂混合物,它包括三种或三种以上光
引发剂的混合物,所述混合物在环境温度或低于环境温度时为液体;混合物包括
(a) 第一种光
引发剂,包括任选取代的羟基 C1-10 烷基 C6-18 芳基酮,在环境温度下为液态;
(b) 第二种光
引发剂,包括任选取代的羟基(环 C3-10 烷基)C6-18 芳基酮,在环境温度下为固态;和
(c) 第三种光
引发剂,包括任选取代的 C6-18 芳基(((C1-10 烷基)1-46-18 芳基羰基))1-3 氧化膦,在环境温度下为固态;其中
(i) 第一光
引发剂(a)和第二光
引发剂(b)以约 0.8 至约 1.2 的重量比存在于混合物中、
(ii) 第一光
引发剂(a)和第二光
引发剂(b)合计占混合物总量的重量比至少约 60%;以及
(iii) 第三种光
引发剂(c)至少占总混合物重量的约 25%。此外,还介绍了包含此类光
引发剂混合物的油墨。