| abstract |
A vinyl polymer (A) in which a hydrolyzable silyl group and / or SiOH group and an organic ultraviolet absorbing group are bonded to a side chain and silica fine particles (B) dispersed in an organic solvent are included. A primer composition for a polysiloxane hard coating, in which the cured and formed primer layer has a linear expansion coefficient of 150 × 10 −6 / ° C. or less. [Effect] The light resistance is greatly improved, the ultraviolet absorber is prevented from being washed away with time, and the organic-inorganic composite produced by crosslinking with siloxane has a low coefficient of linear expansion and a high weather resistance binder. Therefore, an ultraviolet-absorbing protective coating excellent in water resistance, solvent resistance and light resistance is provided. If this composition is coated and cured on an article having inferior weather resistance, coloring and deterioration of the article can be suppressed and good weather resistance can be imparted. [Selection figure] None |