Invention Grant
- Patent Title: Optical article coated with a sub-layer and with a heat-resistant, multilayered antireflection coating, and method for producing same
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Application No.: US12306228Application Date: 2007-06-26
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Publication No.: US09625620B2Publication Date: 2017-04-18
- Inventor: Olivier Beinat , Jean-Louis Sirjean , Michele Thomas
- Applicant: Olivier Beinat , Jean-Louis Sirjean , Michele Thomas
- Applicant Address: FR Charenton Le Pont
- Assignee: ESSILOR INTERNATIONAL (COMPAGNIE GENERALE D'OPTIQUE)
- Current Assignee: ESSILOR INTERNATIONAL (COMPAGNIE GENERALE D'OPTIQUE)
- Current Assignee Address: FR Charenton Le Pont
- Agency: Norton Rose Fulbright US LLP
- Priority: FR0652690 20060628
- International Application: PCT/FR2007/051537 WO 20070626
- International Announcement: WO2008/001011 WO 20080103
- Main IPC: G02B1/116
- IPC: G02B1/116

Abstract:
The invention relates to an optical article having antireflection properties, optionally antistatic properties, having a high thermal and abrasion resistance, as well as the method for producing the same.The article of the invention comprises a substrate and, starting from the substrate: a sub-layer comprising a SiO2-based layer, said SiO2-based layer having a thickness greater than or equal to 75 nm et free from Al2O3; and a multilayered antireflection coating comprising a stack consisting in at least one high refractive index layer and at least one low refractive index layer, all the low refractive index layers of which comprising a mixture of SiO2 and Al2O3, and the high refractive index layers of which are not layers that do absorb in the visible region comprising a substoichiometric titanium oxide and reducing the relative visible light transmission factor (Tv) of the optical article by at least 10% as compared to a same article without any of said visible light absorbing layers.
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