Flexible and foldable abrasion resistant photopatternable siloxane hard coat

• Main Authors: Leppäjärvi, Tiina, Hannu-Kuure, Milja, Leivo, Jarkko, Järvitalo, Henna, Gordon, Graeme, Kärkkäinen, Ari, Hadzic, Admir, Kuvaja, Rauna-Leena
• Format: Patent
• Language: English
• Published: 25.03.2021
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; CORRECTING FLUIDS; DYES; FILLING PASTES; INKS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF MATERIALS THEREFOR; WOODSTAINS

A layered structure comprising a substrate layer; and a layer of a siloxane polymer on the substrate layer, the layered structure being capable of being bent about a mandrel having a radius of curvature without breaking. The layer of the siloxane polymer has a thickness of 1 to 50 μm, in particular about 5 to 20 μm, and it is obtained by depositing on the substrate a composition comprising at least three different silane monomers, including at least one bi-silane; at least one of the silane monomers having an active group capable of achieving cross-linking to adjacent siloxane polymer; at least partially hydrolyzing the silane monomers to form siloxane polymer chains; and cross-linking the siloxane polymer chains so as to achieve a cross-linked siloxane polymer layer on the substrate.