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Process for applying a coating onto a surface of a lens substrate

a lens substrate and coating technology, applied in the direction of adhesive processes with surface pretreatment, instruments, etc., can solve the problems of toxicity, environmental impact, handling,

Inactive Publication Date: 2006-08-03
ESSILOR INT CIE GEN DOPTIQUE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017] Therefore, one object of the invention is to provide a process or method for applying a coated or uncoated film onto a main surface of a lens substrate which does not include the use of an adhesive during the application process.
[0018] A further object of the invention is to provide a process as above, in which the film is a coated film having one surface bearing a coating or a coating stack which is transferred from the film to the lens substrate main surface at the end of the application step, after withdrawal of the film;
[0019] A still further object of the invention is to provide a process for applying a coated or uncoated film onto a surface of a lens substrate without the use of an adhesive, in which the coated or uncoated film is adhered to the main surface of the lens substrate, at the end of the application process.
[0020] The above objects are achieved according to the invention by providing a process for applying a coated or uncoated film onto at least one main surface of a lens substrate which comprises the steps of:

Problems solved by technology

Using a chemical adhesive has several drawbacks regarding toxicity, handling, environment and cost.

Method used

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  • Process for applying a coating onto a surface of a lens substrate
  • Process for applying a coating onto a surface of a lens substrate
  • Process for applying a coating onto a surface of a lens substrate

Examples

Experimental program
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Effect test

example 1

[0215] Example 1

[0216]−2.00 surfaced polycarbonate lens with back curve of 5.0 base is washed with soap and rinsed with deionized (Dl) water. Then, few drops of Dl water are placed on the back surface of the lens and 5.8 base carrier with a reversed HMC coating is applied on the water, after that, an air pressure of 12 PSI (0.827 bar) is applied on the carrier to deform the carrier matching 5.0 back curve of the lens so that a thin water pellicle between lens and the HMC carrier is formed. Maintaining 12 PSI (0.827 bar) pressure, the assembly is heated in an oven at 110° C. for 30 minutes. Then, cooled down and the air pressure is released. After withdrawal of the carrier, the HMC coating is transferred very well on the PC lens surface. The obtained lens has very good optics and cosmetics and good AR performance. The whole process is very simple and clean without any chemical adhesive involved. The dry adhesion test of this lens is scored 0 according to dry adhesion cross hatch test...

example 2

[0217] Example 2

[0218] Same procedure as Example 1 for the coating transfer, except a CR-39® lens whose back curve is surfaced to 6.0 base and a 6.4 base HMC carrier are used. After heating at 110° C. for 30 minutes under 12 PSI (0.827 bar), the carrier is removed and the HMC coating transferred to the lens surface. There is no AR cracking during this transfer.

example 3

[0219] Example 3

[0220] Same as Example 1, except a 6 base piano lens is used with 6.4 base HMC carrier. After heating at 110C. for 30 minutes under 12 PSI (0,827bar), the carrier is removed and the HMC coating transferred to the lens surface. There is no AR cracking during this transfer.

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Abstract

The present invention provides a method for applying a coated or uncoated film onto at least one surface of a lens substrate. The method can be performed without the use of an adhesive during the application process. The film can be a coated film having one surface bearing a coating or a coating stack which is transferred from the film to the lens substrate main surface at the end of the application step, after withdrawal of the film.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an improved process or method for applying a coated or uncoated film onto at least one main surface of a lens substrate which can be implemented in a short period of time without any risk of deformation of the lens substrate which avoids the use of a light or thermal curing adhesive during the application of the film onto the main surface of the lens substrate. [0003] 2. Description of Related Art [0004] It is a common practice in the art to coat at least one main surface of a lens substrate, such as an ophthalmic lens or lens blank, with several coatings for imparting to the finished lens additional or improved optical or mechanical properties. [0005] Thus, it is usual practice to coat at least one main surface of a lens substrate, typically made of an organic glass material, with successively, starting from the surface of the lens substrate, an impact-resistant coating (impact resi...

Claims

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Application Information

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IPC IPC(8): C09J5/02C08J7/043C08J7/046
CPCC08J7/042C08J2369/00C09D151/003G02B1/105B29D11/0073B29D11/00865G02B1/18C08J7/043C08J7/046G02B1/11G02B1/14
Inventor JIANG, PEIQI
Owner ESSILOR INT CIE GEN DOPTIQUE