# US 2019/0170912 A1 · Ophthalmic lens having increased resistance to hot and humid environment > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0170912 A1 - Document ID: US20190170912A1 - Status: Published application - Kind: A1 - Application number: 16/327,496 - Filed: 2017-08-21 - Published: 2019-06-06 - Earliest claimed: 2016-08-23 - Assignees: Corporation De L'ecole Polytechnique De Montreal; Essilor International - Applicants: Corporation De L'ecole Polytechnique De Montreal; Essilor International - Inventors: Martin CARON; Karin SCHERER; Oleg ZABEIDA; Ludvik MARTINU; Jolanta KLEMBERG-SAPIEHA; Thomas SCHMITT - Web page: https://patentgrep.com/patent/US20190170912A1 ## CPC - G02B 1/14: Protective coatings, e.g. hard coatings - G02B 1/115: Multilayers - G02C 7/022: {Ophthalmic lenses having special refractive features achieved by special materials or material structures (G02C7/049 takes precedence)} - G02B 1/111: using layers comprising organic materials - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G02C: SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES (trial frames for testing the eyes A61B3/04; goggles or eyeshields not having the same features as spectacles A61F9/00) ## Abstract The invention concerns an ophthalmic lens having an increased resistance to thermal and hygroscopic stresses, said ophthalmic lens comprising a substrate, at least one main face of which is coated with a siloxane-based anti-abrasion hardcoat, characterized in that said ophthalmic lens further comprises at least one protective layer of an organic-inorganic material directly in contact with said hardcoat, said protective layer of organic-inorganic material having a Young's modulus higher than 20 GPa, preferably of at least 25 GPa. ## Claims ### Claim at position 1 -15. (canceled) ### Claim 16 An ophthalmic lens having an increased resistance to thermal and hygroscopic stresses, said ophthalmic lens comprising a substrate, at least one main face of which is coated with a siloxane-based anti-abrasion hardcoat, wherein said ophthalmic lens further comprises at least one protective layer of an organic-inorganic material directly in contact with said hardcoat, said protective layer of an organic-inorganic material having a Young's modulus higher than 20 GPa. ### Claim 17 (depends on 16) The ophthalmic lens of claim 16, wherein said protective layer of organic-inorganic material has a Young's modulus which does not exceed 40 GPa. ### Claim 18 (depends on 16) The ophthalmic lens of claim 16, wherein said protective layer of organic-inorganic material has a ratio H/E (indentation hardness/Young's modulus) of at least 0.11 or higher. ### Claim 19 (depends on 16) The ophthalmic lens of claim 16, wherein said protective layer of an organic-inorganic material results from the deposition of an organosilicon compound or a mixture of organosilicon compounds in gaseous state. ### Claim 20 (depends on 19) The ophthalmic lens of claim 19, wherein said protective layer of an organic-inorganic material results from the deposition of an organosilicon compound or a mixture of organosilicon compounds in gaseous state, assisted by an ion source, in absence of an inorganic precursor. ### Claim 21 (depends on 20) The ophthalmic lens of claim 20, wherein at least one additional layer is deposited on said protective layer, said additional layer resulting from the deposition of an inorganic precursor, or a mixture of an inorganic precursor and an organic silicon compound. ### Claim 22 (depends on 19) The ophthalmic lens of claim 19, wherein said protective layer of an organic-inorganic material results from the deposition of an organosilicon compound or a mixture of organosilicon compounds in gaseous state, assisted by an ionic source, in presence of an inorganic precursor. ### Claim 23 (depends on 19) The ophthalmic lens of claim 19, wherein the organosilicon compound is octamethylcyclotetrasiloxane and/or decamethyltetrasiloxane. ### Claim 24 (depends on 16) The ophthalmic lens of claim 16, further comprising an interferential stack. ### Claim 25 (depends on 24) The ophthalmic lens of claim 24, wherein said protective layer of an organic-inorganic material constitutes the first layer of the interferential stack. ### Claim 26 (depends on 24) The ophthalmic lens of claim 24, wherein the interferential stack comprises at least one inorganic layer inserted between two layers of organic-inorganic material, one of the two layers of organic-inorganic material constituting the said protective layer of organic-inorganic material in direct contact with said hardcoat. ### Claim 27 (depends on 24) The ophthalmic lens of claim 24, wherein the interferential stack comprises an alternating stack of layers of low and high refractive index, each layer being made of an organic-inorganic material. ### Claim 28 (depends on 24) The ophthalmic lens of claim 24, wherein the interferential stack is an antireflective stack. ### Claim 29 (depends on 21) The ophthalmic lens of claim 21, wherein the deposition is assisted by an ionic source. ### Claim 30 (depends on 16) The ophthalmic lens of claim 16, wherein said protective layer of organic-inorganic material has a Young's modulus which does not exceed 30 GPa. ### Claim 31 (depends on 16) The ophthalmic lens of claim 16, wherein said protective layer of an organic-inorganic material has a Young's modulus of at least 25 GPa. ### Claim 32 A process for increasing the resistance to thermal and hygroscopic stresses of an ophthalmic lens comprising a substrate, at least one main face of which is coated with a siloxane-based anti-abrasion hardcoat, comprising: depositing directly on said hardcoat a protective layer of an organic-inorganic material having a Young's modulus higher than 20 GPa. ### Claim 33 (depends on 32) The process of claim 32, wherein said protective layer of organic-inorganic material has a Young's modulus which does not exceed 40 GPa. ### Claim 34 (depends on 32) The process of claim 32, wherein the deposition of said protective layer of organic-inorganic material comprises depositing an organosilicon compound or a mixture of organosilicon compounds in gaseous state, optionally in presence of an inorganic precursor. ### Claim 35 (depends on 32) The process of claim 32, wherein said protective layer of an organic-inorganic material has a Young's modulus of at least 25 GPa.