A radiation-curable composition in a liquid or solid form comprises at least one solid, non-crystalline radiation-transmissible material, dispersed in at least one cationic-curable or free-radical curable composition or mixture thereof. The solid, non-crystalline radiation-transmissible materials comprise glasses and other suitable materials that transmit (i.e., are transparent to) at least about 40% of radiation having a wavelength from about 180 to about 600 nanometers.
The cationic-curable compositions comprise at least one cycloaliphatic epoxide, at least one polyol, and at least one cation-generating photoinitiator. The free-radical curable compositions comprise at least one ethylenically unsaturated compound and at least one free-radical-generating photoinitiator unless electron beam curing is used, in which case the amount of photoinitiator can be reduced or even eliminated.
The solid forms of the radiation-curable compositions of the invention are useful as powder coatings for coating decorative and functional objects and that would be cured by a thermal heating flow process followed by radiation exposure. The cured compositions of the invention are useful as coatings and inks for metal, paper, plastics, glass, ceramics, and wood, as adhesives, as sealants, and as composite materials and other articles. The cured compositions of this invention also are useful in biomedical and dental applications, including prosthetic devices such as dentures; coatings, fillings, and caps for teeth; and the like.
液态或固态辐射固化组合物包括至少一种固态非结晶透射材料,分散在至少一种阳离子固化或自由基固化组合物或其混合物中。固态非结晶可透射辐射材料包括
玻璃和其他合适的材料,它们可透射(即对)至少约 40% 波长从约 180 纳米到约 600 纳米的辐射。
阳离子固化组合物包括至少一种环脂族
环氧化物、至少一种多元醇和至少一种产生阳离子的光
引发剂。自由基固化组合物包括至少一种
乙烯基不饱和化合物和至少一种产生自由基的光
引发剂,除非使用电子束固化,在这种情况下,光
引发剂的用量可以减少甚至取消。
本发明辐射固化组合物的固态形式可用作粉末涂料,用于涂覆装饰性和功能性物体,并可通过热加热流工艺固化,然后进行辐射照射。本发明的固化组合物可用作
金属、纸张、塑料、
玻璃、陶瓷和木材的涂层和油墨,也可用作粘合剂、密封剂、复合材料和其他物品。本发明的固化组合物还可用于
生物医学和牙科应用,包括假牙等修复装置;牙齿的涂层、填充物和盖子等。