Sensitisation and stabilisation of organometallic compounds acting as photocatalysts and photosensitisers in photochemical radical polymerisation process
申请人:CHIMIA PRODOTTI E PROCESSI SRL
公开号:EP0421512A1
公开(公告)日:1991-04-10
Object of the present invention is a radical polymerisation process of compounds containing carbon-carbon double bonds, carried out either photochemically, by means of visible or ultraviolet radiation, or by electron beams, employing at least one organometallic compound in which coordinated central atom is a transition element and ligands are coordinated to central atom by means of at least one element including C,N,P,As,Sb,O,S,Se,Te,B, and/or as elements in the form of the simple uninegative ions H,F,Cl,Br,I, and also employing preferably at least one photosensitizer of some type already known.
Object of the present invention is also a chemical stabilisation process for photocatalytic systems above, and particularly for those containing central ion in a high oxidation or relatively unstable state. This process is based on a suitable preparative method of the photocatalytic system, and/or on the addition of small amounts of compounds (mostly Lewis acids or bases), able to impart to the resulting composition a sufficiently lasting stability and efficiency, to the purpose of the present patent.
本发明的目的是含碳碳双键化合物的自由基聚合工艺,该工艺通过可见光或紫外线辐射或电子束以光
化学方式进行、采用至少一种有机
金属化合物,其中配位中心原子为过渡元素,
配体通过至少一种元素与中心原子配位,这些元素包括 C、N、P、As、Sb、O、S、Se、Te、B 和/或以简单的非负离子 H、F、Cl、Br、I 形式存在的元素,最好还采用至少一种已知类型的光敏剂。
本发明的目的还在于上述光催化系统的
化学稳定工艺,特别是那些含有处于高氧化态或相对不稳定态的中心离子的光催化系统。该工艺基于光催化系统的适当制备方法,和/或基于添加少量化合物(主要是
路易斯酸或碱),这些化合物能够赋予所产生的组合物足够持久的稳定性和效率,从而达到本专利的目的。