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US 2020/0048472 A1Published application
Radiation-Curable Hard Coating Composition
AssigneeEssilor International
InventorRobert Valeri
Life of this patent
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Abstract
The UV-curable coating compositions disclosed herein are provided for use as coatings for plastic (organic glass) substrates, and ophthalmic lenses, in particular. The compositions may be applied by a variety of means, including spin coating and inkjet coating. The coating compositions exhibit abrasion resistance comparable to conventional thermally-cured sol-gel coatings.
Claims13
A photocurable coating composition comprising a mixture of:
- a) at least one non-hydrolyzed epoxy(alkoxy)silane;
- b) at least one dispersion of inorganic nanoparticles and at least one acrylate;
- c) at least one acrylate binder or silane binder;
- and
- d) at least one free radical photoinitiator, cationic photoinitiator, or a combination thereof;
- wherein:
- the composition does not comprise hydrolyzed epoxy(alkoxy)silane;
- the composition comprises 25 to 65 parts by weight of the non-hydrolyzed epoxy(alkoxy)silane;
- and
- the composition comprises 20 to 60 parts by weight of the at least one dispersion of inorganic nanoparticles and at least one acrylate.
7 more elements
A method for manufacturing an abrasion-resistant, hard-coated substrate, the method comprising:
- coating an optical substrate with a photocurable coating composition comprising a mixture of:
- a) at least one non-hydrolyzed epoxy(alkoxy)silane;
- b) at least one dispersion of inorganic nanoparticles and at least one acrylate;
- c) at least one acrylate binder or silane binder;
- and
- d) at least one free radical photoinitiator, cationic photoinitiator, or a combination thereof;
- wherein:
- the composition comprises 25 to 65 parts by weight of the non-hydrolyzed epoxy(alkoxy)silane;
- and
- the composition comprises 20 to 60 parts by weight of the at least one dispersion of inorganic nanoparticles and at least one acrylate;
- and
- curing the photocurable composition coating with UV irradiation;
- wherein the method does not comprise a hydrolysis step prior to curing.
10 more elements
An optical article having at least one main surface comprising a coating obtained by:
- depositing a photocurable coating composition comprising a mixture of:
- a) at least one non-hydrolyzed epoxy(alkoxy)silane;
- b) at least one dispersion of inorganic nanoparticles and at least one acrylate;
- c) at least one acrylate binder or silane binder;
- and
- d) at least one free radical photoinitiator, cationic photoinitiator, or a combination thereof
- wherein:
- the composition comprises 25 to 65 parts by weight of the non-hydrolyzed epoxy(alkoxy)silane;
- and
- the composition comprises 20 to 60 parts by weight of the at least one dispersion of inorganic nanoparticles and at least one acrylate;
- and
- curing the photocurable composition coating to produce an optical article having a coating which exhibits a relative abrasion resistance of at least 2.5, when tested according to ASTM F735.
9 more elements
Dependencies are inferred from the claim text.