| 摘要 |
The coating composition according to the invention comprises: (A) a component which is the reaction product with oxalic acid of at least one organometallic compound of formula: <paragraph lvl="0"><in-line-formula>Ry1-M (OR)x-y (I) </in-line-formula>wherein, M is a metal R is H or an alkyl radical, R1 is a chelating ligand, x is the valency of the metal, y is an integer at least equal to 1 and x-y is at least equal to 1; and (B) at least one organoalkoxysilane of formula: <paragraph lvl="0"><in-line-formula>Rn3Si (OR2)4-n (II) </in-line-formula>wherein, R2 is an alkyl radical, R3 is an epoxidized alkyl group and n is an integer from 1 to 3 or a mixture of the organoalkoxysilane of formula (II) with an alkoxysilane of formula (II') R'n'Si(OR'')4-n' (II') wherein n' is an integer from 0 to 3, R'' is H, an alkyl radical or an alkoxyalkyl radical, and R' is a vinyl, (meth)acryl, aromatic, cyclic or aliphatic alkyl radical. Application for making abrasion-resistant coating on plastic ophtalmic lenses.
|
