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Method for producing an article made of a transparent material devoid of visible surface lines and the thus obtained article

A technology for surface treatment and products, applied in the field of transparent products, which can solve the problems of difficult to control deposits, large recommended thickness of coatings, etc.

Inactive Publication Date: 2008-08-13
ESSILOR INT CIE GEN DOPTIQUE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] Firstly, the recommended thickness of the coating is large, so it is always difficult to control the deposit

Method used

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  • Method for producing an article made of a transparent material devoid of visible surface lines and the thus obtained article
  • Method for producing an article made of a transparent material devoid of visible surface lines and the thus obtained article
  • Method for producing an article made of a transparent material devoid of visible surface lines and the thus obtained article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0294] The following examples illustrate the invention.

[0295] In this example, unless otherwise stated, all percentages are percentages by weight, and the refractive index is measured at 25° C. and wavelength λ=550 nm.

[0296] For a refractive index n of base 6.75 (base = 530 / R in mm, where R is the radius of curvature of the lens), made from MR7 material (based on polythiourethane) sold by MITSUI D 25 A semi-finished spherical ophthalmic lens with a power of 1.660 and a power of -6.00 diopters was subjected to the surface treatment shown below.

[0297] Regardless of whether it is concave or convex, the surface treatment is carried out as follows:

[0298] ●Processed on a SCHNEIDER HSC100 machine. Refining is carried out using a single crystal diamond tool with a radius of 2 mm, a rotational speed of less than or equal to 600 rpm, a forward motion of less than or equal to 0.04 mm / rev, and a depth of cut equal to 0.1 mm.

[0299] • Polishing on a SCHNEIDER CCP101 machi...

Embodiment 5 and 6

[0339] Examples 5 and 6: Deposition of coating compositions with variable contact angles

[0340] Using two different concentrations of the HMP solvent 4-hydroxy-4-methyl-2-pentanone (CH 3 ) 2 C(OH)CH 2 COCH 3 Two masking coating compositions were prepared: solution M3 (by diluting M2 at 70% by weight in HMP) and solution M4 (by diluting at 30% by weight in HMP). This changes the contact angle of the composition on a substrate with a refractive index of 1.67.

[0341] First, the contact angles of paint films M3 and M4 on molded double-sided 1.67 ophthalmic lenses were measured. The operating procedures are as follows:

[0342] The device used was DIGIDROP manufactured by GBX Instrumentation Scientifique. This is a device for automatic measurement of contact angle and wettability. DIGIDROP includes camera, image analysis and processing system and measurement program.

[0343] Droplet microcontrollers make it possible to deposit precise amounts of liquid simply using a v...

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Abstract

A method for producing an article which is made of a transparent material and devoid of visible surface lines consists in producing a substrate which is made of a transparent material having a refractive index ns, whose at least main face is machined and polished in such a way that the Ra value thereof ranges from 0.001 to 0.01 mum, but has visible surface defects in the form of thin individual scratches, in deposing, a liquid polymerisable composition of a masking coating, whose contact angle with said substrate main face is equal or less than 30 DEG and which is formed by polymerising a masking coating having a refractive index nc such as 0.01 < |ns - nc| = 0.15 and a thickness less than 10 micrometers, directly on the machined and polished main face of the substrate, in polymerising the masking coating composition and in removing the transparent article.

Description

technical field [0001] The present invention generally relates to a process for the manufacture of transparent articles free of visible optical defects after surface treatment, and their use in the manufacture of optical articles such as lenses, in particular ophthalmic lenses (lentilles ophtalmiques), more preferably spectacles (verres de lunettes). Background technique [0002] Usually, the surface treatment is carried out on the main faces of the substrates made of transparent materials used for the production of optical articles. [0003] The surface treatment of the substrate includes all operations for producing an optical article (such as spectacles) whose surface is well polished and has a desired curvature (magnification). [0004] Typically, the surface treatment comprises three consecutive steps, namely grinding, doucissage and polishing. [0005] Grinding is a machining step whose purpose is to impart curvature to one of the faces of the substrate by means of co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/10G02C7/02B29D11/00
CPCB29D11/00865Y10T428/24364G02B1/10
Inventor C·比维尔N·勒萨特勒J-M·帕迪乌R·瓦勒里
Owner ESSILOR INT CIE GEN DOPTIQUE
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