Optischer Artikel mit Abriebfester Und/oder Kratzfester Beschichtung mit Hohem Brechungsindex und Geringer Empfindlichkeit Gegenüber Umgebungsbedingungen

Details

Veröffentlichungs-Nr.

EP4636012

Aktenzeichen

EP24305614

Anmeldetag

19. April 2024

Veröffentlichung

22. Oktober 2025

Rechtsraum

EP

IPC

C08G77/04B32B7/02B32B25/20C08G77/06C08G77/14C08J7/04C08J7/046C08K3/22C09D183/06G02B1/11G02B1/111G02B1/14

Abstract

The invention relates to a curable composition for an abrasion-and/or scratch-resistant coating, comprising at least one epoxy compound bearing at least one silicon atom having at least one hydrolyzable group directly linked to the silicon atom and at least one group comprising an epoxy function linked to the silicon atom through a carbon atom, and/or a hydrolyzate thereof, at least one silane compound of formula Z¹Z²SiR¹R², and/or a hydrolyzate thereof, in an amount of 1 to 10 %, relative to the dry extract weight of the composition, in which Z¹ and Z² independently represent a hydrolyzable group or a hydrogen atom, R¹ and R² independently represent a monovalent organic group devoid of epoxy group and linked to the silicon atom through a carbon atom, colloidal particles of metal oxide or metalloid oxide, comprising (c1) colloidal particles of titanium oxide, and (c2) colloidal particles of tin oxide, at least one curing catalyst, wherein tin oxide expressed as SnOz and titanium oxide expressed as TiO₂ are present in the composition in a weight ratio of TiO₂/(TiO₂+SnO₂) ranging from 35 % to 75 %. The resulting coating can be formed on an optical article.

Anmelder

Firma

Essilor International

Land

🇫🇷 Frankreich

Fachgebiete