| 摘要 |
<p>FN 33541CAN1A 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.</p> |
