Article having uneven surface, production process for the article, and composition for the process

Abstract

A process for producing an article having a finely uneven surface coated with a film, which has high heat resistance and which neither cracks nor peels off from a substrate, by forming a film of a sol material between a substrate and a mold in such a manner that the film is in close contact with them and applying heat to form a gelled film, which has a surface configuration that is the inversion of the surface configuration of the mold, on the surface of the substrate, wherein the sol material contains (A) R 2 SiX 2 (R is an alkyl group and X is an alkoxyl group or halogen atom) and (B) R′SiX′ 3 (R′ is an aryl group or substituted aryl group and X′ is an alkoxyl group or halogen atom).

What is claimed:  
     
         1 . An article having an uneven surface produced by the process comprising forming a film of a sol material between the substrate of the article and a mold in such a manner that the film is in close contact with these and heating the film to form a gelled film, which has a surface configuration that is the inversion of the surface configuration of the mold, on the surface of the substrate of the article, wherein 
 the sol material contains (A) a silane compound represented by the following formula (1):    R 2 SiX 2   (1)     wherein R is an alkyl group and X is an alkoxyl group or a halogen atom, and    (B) a silane compound represented by the following formula (2):    R′SiX′ 3   (2)     wherein R′ is a substituted or unsubstituted aryl group and X′ is an alkoxyl group or a halogen atom,    wherein an organopolysiloxane film having an uneven surface is formed to a thickness of 1 μm to 1 mm on the surface of the substrate of the article and the film contains 5 to 25 wt % of an alkyl group and 5 to 40 wt % of an aryl group.