Antistatic sol/gel compositions and optical articles coated therewith

摘要

The invention relates to an antistatic coating composition comprising a hydrolyzate resulting from the at least partial hydrolysis of: a component A consisting of one or more compounds containing at least one polyalkylene oxide segment and at least one —Si(X)n hydrolyzable group, in which n is an integer ranging from 1 to 3 and the X groups are precursors of OH groups; at least one inorganic metal salt; and optionally, at least one component B, consisting of one or more compounds of formula Rn,Si(Z)4-n′ or formula R1n1Ym1Si(Z1)4-n1-m1, in which the R groups are monovalent alkyl groups, the Z and Z1 groups are hydrolyzable groups or hydrogen atoms, the R1 groups are monovalent organic groups linked to the silicon atom through a carbon atom, the Y groups are monovalent organic groups linked to the silicon atom and containing at least one epoxy function, n′ is an integer equal to O, 1 or 2, m1 and n1 are integers such that m1 is equal to 1 or 2 and n1+m1=1 or 2, component A and optional component B being chosen such that a cross-linked structure is generated upon polymerization of said composition, the dry extract of said composition containing less than 5% by weight of free polyalkylene oxide polymers.

主权项

1. An antistatic sol/gel forming coating composition comprising:
(a) a hydrolyzate resulting from at least partial hydrolysis of a component A consisting of one or more compounds containing at least one polyalkylene oxide segment and at least two —Si(X)n hydrolyzable groups in which n is an integer ranging from 1 to 3, and the X groups independently are precursors of OH groups; (b) optionally, at least one component B consisting of:
one or more compounds of formula:
Rn′Si(Z)4-n′  (I) or a hydrolyzate thereof, in which the R groups independently are monovalent alkyl groups, the Z groups independently are hydrolyzable groups or hydrogen atoms, and n′ is an integer equal to 0, 1 or 2, such that the Z groups do not all represent a hydrogen atom when n′=0; with or without one or more compounds of the formula:
R1n1Ym1Si(Z1)4-n1-m1  (II) or a hydrolyzate thereof, in which the R1 groups independently are monovalent organic groups linked to the silicon atom through a carbon atom, the Y groups independently are monovalent organic groups linked to the silicon atom and containing at least one epoxy function, the Z1 groups independently are hydrolyzable groups or hydrogen atoms and m1 and n1 are integers such that m1 is equal to 1 or 2 and n1+m1=1 or 2; and (c) at least one inorganic metal salt; wherein component A and optional component B generate a cross-linked structure upon polymerization of the composition, the dry extract of the composition containing less than 5% by weight free polyalkylene oxide polymers.