Method for manufacturing of optical element, optical element thus obtained

A technology of optical components and components, applied in optical components, optical components, optics, etc., can solve the problems of lowering the refractive index of the final polymer, difficult to identify monomers, and incompatibility with high-viscosity systems

Active Publication Date: 2021-05-11
ESSILOR INT CIE GEN DOPTIQUE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008]However, it is difficult to identify such monomers, especially to balance the viscosity of the polymerizable composition with the refractive index of the final polymer
Acrylic / methacrylic monomers are often used as reactive solvents to reduce viscosity, but tend to lower the refractive index of the corresponding final polymer
In contrast, high-index monomers often contain fluorene compounds or aromatic groups, resulting in high-viscosity systems that are incompatible with polymer jetting techniques

Method used

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  • Method for manufacturing of optical element, optical element thus obtained
  • Method for manufacturing of optical element, optical element thus obtained

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[0080] 1. Chemicals used

[0081] Optical materials were prepared by:

[0082] - a first composition comprising 50.6 g of diisocyanatonorbornane (CAS No. 74091-64-8) as compound C1, 1.8 g of Seesorb 701 (CAS No. 2440-22-4) as thermal catalyst ) and 0.04 g of dimethyltin dichloride (CAS No. 753-73-1); - a second composition comprising 23.9 g of pentaerythritol tetrakis(3-mercaptopropionate) (CAS No. 7575-23-7) and 25.3 g of 2,3-bis((2-mercaptoethyl)thio)-1-propanethiol (CAS No. 131538-00-6); and

[0083] - 2 g of 9-anthrylmethyl N,N-diethylcarbamate methyl (CAS No. 1228312-05-7) dissolved in 2 g of ethyl acetate as photobase generator.

[0084] 2. Preparation of Optical Components

[0085] Optical elements are built on PMMA substrates by stacking multiple flat layers with different diameters, resulting in plano-convex structures.

[0086] High-end inkjet printers are used to precisely control droplet placement.

[0087] The first composition, the second composition and the...

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Abstract

The present invention relates to a method for the manufacturing of an optical element having a refractive index above 1.59 by additive manufacturing to the optical element obtained by such a method and to an ophthalmic lens comprising such an optical element.

Description

technical field [0001] The invention belongs to the field of optical devices, especially the field of manufacturing optical elements with high refractive index (greater than 1.59). [0002] More specifically, the present invention relates to a method for manufacturing optical elements having a refractive index greater than 1.59 by additive manufacturing, to optical elements obtained by such a method, and to an ophthalmic lens comprising such an optical element . Background technique [0003] In the ophthalmic industry, it is desirable to obtain high index polymers (ie, greater than 1.59) to reduce the thickness of prescription lenses when high diopter corrections are required. [0004] Prescription plastic lenses exhibiting a high index of refraction are typically manufactured by a casting process that involves a very long polymerization cycle of pouring a liquid monomer mixture into a mold and hardening to produce a solid polymeric material. In particular, after filling w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D11/00G02C7/04
CPCB29D11/00355B29D11/00442B29C64/112B29D11/00009B33Y70/00B33Y80/00B33Y10/00G02C7/04
Inventor M·弗拉德P·弗罗芒坦M·雷科皮P·莱特
Owner ESSILOR INT CIE GEN DOPTIQUE
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