Photoactivated polymerization of vinyl monomer in the presence of polysilanes and amines
申请人:MINNESOTA MINING AND MANUFACTURING COMPANY
公开号:EP0154519A2
公开(公告)日:1985-09-11
This invention relates to photoactivatable polysilanes and processes involving the use thereof.
It is frequently desirable to employ photopolymerization techniques to conduct the polymerization of vinyl (ethylenically unsaturated) monomers and prepolymers.
The invention comprises subjecting a mixture of
(1) a vinyl monomer or prepolymer, and
(2) a polysilane having a chain of catenated silicon atoms (which may appear in an open chain or in a ring configuration) and a molecular weight of from about 5 x 102 to 5 x 106 to electromagnetic energy having wavelengths in the absorption range of from about 250 to 400 nanometers (nm) until the degree of polymerization of the monomer or prepolymer has increased. In another aspect, an organic amine can be included in the aforementioned mixture, in which case the amine acts as an activator.
The process of the invention is particularly useful where it is desired to provide protective films or coatings on substrates since it has a number of advantages (such as speed, economy, efficiency and the like) over conventional polymerization techniques. The compositions of the invention can be conveniently applied as liquids to substrates then polymerized by means of electromagnetic energy, alone or together with elevated temperature, to form hard coatings.
本发明涉及可光激活的聚硅烷及其使用工艺。
乙烯基(乙烯基不饱和)单体和预聚物的聚合通常需要采用光聚合技术。
本发明包括将乙烯基(乙烯基不饱和)单体和预聚物的混合物
(1) 乙烯基单体或预聚物,和
(2) 聚硅烷,该聚硅烷具有一条由硅原子组成的链,硅原子可呈开放链或环状结构,分子量约为 5 x 102 至 5 x 106,将其置于波长在约 250 至 400 纳米(nm)吸收范围内的电磁能中,直至单体或预聚物的聚合度增加。另一方面,上述混合物中可加入有机胺,在这种情况下,胺可作为活化剂。
与传统聚合技术相比,本发明的工艺具有许多优点(如速度快、经济、高效等),因此在需要在基材上提供保护膜或涂层时特别有用。本发明的组合物可以作为液体方便地涂在基底上,然后通过电磁能单独或与升高的温度一起聚合,形成坚硬的涂层。