Carbon nanotube-based curable coating composition providing antistatic abrasion-resistant coated articles

A curable composition, providing, upon curing, an abrasion-resistant, transparent, antistatic coating, wherein the abrasion resistance is characterized by a Bayer value greater than 5, and wherein the coating consists of:

• a) carbon nanotubes, and
• b) a binder comprising at least one compound of formula:
• Rn′YmSi(X)4-n′-m (I)
• or a hydrolyzate thereof, in which the R groups are identical or different and represent monovalent organic groups linked to the silicon atom through a carbon atom, the Y groups are identical or different and represent monovalent organic groups linked to the silicon atom through a carbon atom and containing at least one epoxy function, the X groups are identical or different and represent hydrolyzable groups or hydrogen atoms, m and n′ are integers such that m is equal to 1 or 2 and n′+m=1 or 2;
• and
• c) SiO2 nanoparticles having a diameter of greater than or equal to 25 nm;
• wherein the curable composition does not comprise a compound of
• Rn′Si(Z)4-n (II)
• or a hydrolyzate thereof, in which the R groups are identical or different and represent monovalent alkyl groups, the Z groups are identical or different and represent hydrolyzable groups or hydrogen atoms, and n is an integer equal to 0, 1, or 2.

A curable composition, providing, upon curing, an abrasion-resistant, transparent, antistatic coating, wherein the abrasion resistance is characterized by a Bayer value greater than 5, and wherein the coating consists of:

• a) carbon nanotubes, and
• b) a binder comprising at least one compound of formula:
• Rn′YmSi(X)4-n′-m (I)
• or a hydrolyzate thereof, in which the R groups are identical or different and represent monovalent organic groups linked to the silicon atom through a carbon atom, the Y groups are identical or different and represent monovalent organic groups linked to the silicon atom through a carbon atom and containing at least one epoxy function, the X groups are identical or different and represent hydrolyzable groups or hydrogen atoms, m and n′ are integers such that m is equal to 1 or 2 and n′+m=1 or 2;
• c) SiO2 nanoparticles having a diameter of greater than or equal to 25 nm;
• d) a solvent;
• e) a curing catalyst;
• and
• f) a surfactant;
• wherein the curable composition does not comprise a compound of
• Rn′Si(Z)4-n (II)
• or a hydrolyzate thereof, in which the R groups are identical or different and represent monovalent alkyl groups, the Z groups are identical or different and represent hydrolyzable groups or hydrogen atoms, and n is an integer equal to 0, 1, or 2.

An optical article comprising a substrate, and, starting from the substrate:

• a first, silicon-containing, abrasion- and/or scratch-resistant coating having a thickness of at least 1 μm;
• and
• a 50 nm to 2 μm thick antistatic coating formed by depositing directly onto said abrasion- and/or scratch-resistant coating a curable composition comprising:
• a) carbon nanotubes, and
• b) a binder comprising at least one compound of formula:
• Rn′YmSi(X)4-n′-m (I)
• or a hydrolyzate thereof, in which the R groups are identical or different and represent monovalent organic groups linked to the silicon atom through a carbon atom, the Y groups are identical or different and represent monovalent organic groups linked to the silicon atom through a carbon atom and containing at least one epoxy function, the X groups are identical or different and represent hydrolyzable groups or hydrogen atoms, m and n′ are integers such that m is equal to 1 or 2 and n′+m=1 or 2;
• and
• c) SiO2 nanoparticles having a diameter of greater than or equal to 25 nm;
• and
• wherein the optical article is further defined as having a relative light transmission factor in the visible spectrum Tv higher than 90% and a Bayer value greater than 5;
• wherein the curable composition does not comprise a compound of
• Rn′Si(Z)4-n (II)
• or a hydrolyzate thereof, in which the R groups are identical or different and represent monovalent alkyl groups, the Z groups are identical or different and represent hydrolyzable groups or hydrogen atoms, and n is an integer equal to 0, 1, or 2.