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Functional sheet and lens using same

a technology of functional sheets and lenses, applied in the direction of instruments, spectales/goggles, other domestic articles, etc., can solve the problems of aromatic polycarbonate, affecting the production yield, and often affecting the use effect, so as to improve the production yield and reduce the risk of being scratched in us

Inactive Publication Date: 2012-08-16
MITSUBISHI GAS CHEM CO INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0037]Sunglasses, goggles and the like using a functional sheet according to the present invention are improved in the production yield, and also are less liable to be scratched in use.

Problems solved by technology

A functional layer and a protective layer are integrated together usually by use of a curable resin adhesive, but troubles sometimes occur due to adhesion failure between the functional layer and the protective layer.
Especially when aromatic polycarbonate is used for the protective layer, such an adhesion failure is often observed as delamination of the aromatic polycarbonate protective layer from the adhesive layer.
Aromatic polycarbonate has a problem of causing solvent cracks.
Therefore, depending on the solvent used, an adhesive layer cannot be formed on the layer of aromatic polycarbonate, and moreover, the remaining solvent causes cracks.
However, if excessive drying is performed for the purpose of removing the solvent, the adhesive strength is usually weakened.
There are also limitations on forming an adhesive layer on both adherend surfaces of aromatic polycarbonate for the purpose of realizing strong adhesion.
However, there is no document found yet which directly refers to forming a protective layer against the adhesive agent.
While being handled as described above, the layer of the transparent plastic material is exposed to stresses caused by abrasion, bending, compression, tension, twisting, non-uniform deformation due to temperature or humidity change, and the like.
Among these, abrasion on the surface layer of the transparent plastic material is a problem.
When the material is not highly resistant against abrasion, a product having scratches is liable to be provided, which lowers the production yield.

Method used

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  • Functional sheet and lens using same
  • Functional sheet and lens using same
  • Functional sheet and lens using same

Examples

Experimental program
Comparison scheme
Effect test

example 1 (see fig.2a)

Example 1 (see FIG. 2a)

[0135]To one surface of the polarizing film obtained above, the adhesive composition was applied by use of a coater and dried at 110° C. for 5 minutes. The two-layer co-extruded sheet 1 having a thickness of 0.7 mm was laminated thereon such that the PC layer would be in contact with the adhesive composition. Next, on the surface of the polarizing film of the resultant laminate, an adhesive layer was formed in the same manner. Then, another co-extruded sheet 1 was laminated such that the PC layer would be in contact with the adhesive layer. The resultant laminate was dried at room temperature for 1 day or longer and then at 70° C. for 1 day. Thus, a polarizing sheet of PMMA*PC / adhesive layer / polarizing film / adhesive layer / PC*PMMA having a thickness of 1.5 mm was obtained. Both of the surfaces of the polarizing film were of PMMA.

[0136]The resultant polarizing sheet was subjected to a pencil hardness test (JIS-K-5600-5-4). The polarizing sheet was confirmed to h...

example 2 (see fig.2b)

Example 2 (see FIG. 2b)

[0139]To the C-PMMA-side surface of the three-layer co-extruded sheet 2 having a thickness of 0.7 mm, the above-described adhesive composition was applied by use of a coater and dried at 110° C. for 5 minutes. Then, the above-obtained polarizing film was laminated thereon by use of a laminator. Separately, on the co-extruded sheet 2, the adhesive composition was applied thereto and dried in the same manner as described above. On the surface of the polarizing film of the above-obtained laminate, the separately obtained sheet was laminated such that the C-PMMA-side surface thereof would be in contact with polarizing film. Next, the resultant laminate was dried at room temperature for 1 day or longer and then at 70° C. for 1 day. Thus, a polarizing sheet of PMMA*PC*C-PMMA / adhesive layer / polarizing film / adhesive layer / C-PMMA*PC*PMMA having a thickness of 1.5 mm was obtained. Both of the surfaces of the polarizing sheet were of PMMA.

[0140]The resultant polarizing s...

example 3 (see fig.2c)

Example 3 (see FIG. 2c)

[0142]A polarizing sheet of PMMA*PC / adhesive layer / polarizing film / adhesive layer / PC having a thickness of 0.6 mm was obtained in the same manner as in Example 1 except that the co-extruded sheet 4 (2) having a thickness of 0.3 mm was used as one protective sheet and a high retardation PC film having a thickness of 0.3 mm was used as the other protective sheet, instead of the co-extruded sheet 1 used in Example 1.

[0143]The resultant polarizing sheet was subjected to a pencil hardness test in the same manner as in Example 1. The polarizing sheet had a pencil hardness of 3H on the PMMA side and a pencil hardness of B on the PC side.

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Abstract

According to the present invention, a functional sheet, comprising a polarizing or photochromic functional layer and protective layers provided on both surfaces of the functional layer can be provided. The protective layers include an aromatic polycarbonate resin sheet or film. At least one of the protective layers is a co-extruded sheet or film including an aromatic polycarbonate resin layer and an acrylic-based resin layer provided on one surface or both surfaces of the aromatic polycarbonate resin layer. At least one surface of the functional sheet is of the acrylic-based resin layer. Also according to the present invention, a lens using such a functional sheet can be provided.

Description

TECHNICAL FIELD[0001]The present invention relates to a functional sheet having polarization properties or photochromic properties preferably usable for sunglasses, goggles, corrective lenses and the like, and a lens using such a functional sheet.BACKGROUND ART[0002]Optical items such as sunglasses, goggles, and corrective lenses and the like with polarizers are preferably used for the purpose of alleviating the glare provided by light reflected by a water surface, a snow surface, a road surface or the like and making outdoor scenes easier to see. When natural light is incident on, and reflected by, a water surface or the like, there is a polarization component which is monotonously increased with respect to the angle of reflection. The above-mentioned optical items utilize a phenomenon that when a polarizer is used such that an absorption axis thereof is horizontal, such a polarization component can be cut. Light can be described and behave by two straight polarizations perpendicul...

Claims

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Application Information

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IPC IPC(8): G02C7/10B32B7/02G02B1/10B32B27/36
CPCG02B1/04G02B5/23G02B5/305G02C7/102Y10T428/24983G02C7/12G02C2202/16C08L69/00B29D11/0073Y10T428/31507G02B1/14B32B27/365C09J129/04G02C7/108G02B5/3033G02B5/3083
Inventor OHKUBO, AKIOKIMURA, HIDEAKIHIRATA, MASUKAZUYAGOURA, MASAKI
Owner MITSUBISHI GAS CHEM CO INC
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