JP2023031185A - Seal for spectacle lens - Google Patents

Abstract

To provide a seal for spectacle lenses that eliminates the need to purchase new lenses or remachine them at a factory even when various functions of lenses deteriorate, and a raw material thereof.SOLUTION: A seal 11 for spectacle lenses adds functionality to spectacle lenses. The seal comprises a double-sided adhesive laminate 13 and a functional film layer 15. The double-sided adhesive laminate 13 comprises a substrate layer 17 made of a non-stretched film, a weak adhesive layer 19 on one side of the substrate layer 17, and a strong adhesive layer 21 on the other side. The functional film layer 15 is attached to the strong adhesive layer 21 . The seal for lenses can be reattached (reworked) to the spectacle lenses via the weak adhesive layer 19.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a spectacle lens seal that is attached for the purpose of adding required functionality and that is reworkable (can be replaced). Here, spectacle lenses include not only lenses for vision correction, but also non-prescription lenses for sunglasses, goggles, polarized glasses, and the like.

Recently, spectacle lenses made of a transparent resin substrate and provided with an optically functional resin layer having various functions (performances) such as dimming properties and specific wavelength absorption properties (ultraviolet rays, blue light cuts, etc.) are well known. (Patent Document 1 [Abstract], [Claim 1], [Claim 3], [Fig. 1], [Fig. 4], etc.], Patent Document 2 [Abstract], [Claim 1], [Fig. 1 ]etc). It is also well known that spectacle lenses made of organic glass are usually provided with scratch resistance by hard coating (Patent Document 1, lines 19 to 21). Polarizing spectacle lenses and sunglasses in which an optical film such as a polarizing film is embedded in order to impart polarizing properties are also well known (Patent Document 1 [Claim 4], [Fig. 4], etc.).

In place of the functional resin layer, or when the functionality of the functional resin layer deteriorates over time, a material that can be easily added or restored to the lens by the spectacle user himself or by an optician. The inventors of the present invention are not familiar with such inventions.

In addition, reworkable (re-stickable) double-sided protective adhesive sheets are well known for display screens of mobile phones, smartphones, televisions, etc., and as blindfold sheets for automobiles (Patent Document 3 [Claim 10], [0014] etc., Patent Document 4 [Claim 17], [Claim 18], [0019], Patent Document 5 [Claim 5], [0007], etc.).

WO2003/008171 JP 2014-156067 A JP 2015-131945 A Japanese Patent Application Laid-Open No. 2019-31610 Japanese Patent Application Laid-Open No. 2020-164761

However, when these functions are imparted to the lens, the number of molding steps for forming the functional resin layer (including the polarizing film layer) increases, and it is difficult to maintain these functions for a long period of time. Therefore, when these functions deteriorated, it was usually necessary to buy a new lens or reprocess it at the factory.

An object (object) of the present invention is to provide a spectacle lens seal and its material that do not require replacement of the lens or reprocessing at the factory even if various functions of the lens deteriorate.

The present invention solves the above-mentioned problems by means of a spectacle lens seal comprising the following invention-specifying matters (configuration) (identified by the reference numerals in FIG. 1).

A spectacle lens seal 11 that adds functionality to a spectacle lens,
comprising a double-sided adhesive laminate 13 and a functional film layer 15,
The double-sided adhesive laminate 13 includes a substrate layer 17 made of a non-stretched film, a weak adhesive layer 19 formed on one side of the substrate layer 17 and capable of being reattached (reworked) to a spectacle lens, and the substrate layer 17. A strong adhesive layer 21 formed on the surface and to which the functional film layer 19 is attached,
Each thickness of the base material layer 17 and the functional film layer 15 is set so as not to hinder the ability to follow the spherical surface of the spectacle lens.

The lens seal 11 configured as described above is used by being attached to a spectacle lens via a weak adhesive layer 19 . At this time, since the base material layer 17 of the double-sided adhesive laminate 13 is not stretched, good followability is ensured even if the lens has a spherical surface due to the structure of the final stage, and the workability of attaching the seal is excellent. . Then, the used seal 11 (functional film layer 15 ) whose functionality has deteriorated is replaced with a new lens seal 11 . This eliminates the need for replacement lenses or factory rework.

Conventionally, no document describing such a lens seal has been found, nor has it appeared on the market. In the first place, in the eyeglass industry, there is no concept of applying adhesive tape for surface protection (screen protection member) applied to the screens of electronic devices such as smartphones to eyeglass lenses. The reason is considered as follows.

,
The weak adhesive side of ordinary double-sided tape is intended to be attached to a smooth (flat) surface. For example, in the column of Patent Document 3 [Effect of the Invention], it is stated that "especially excellent adhesion to adherends having smooth surfaces such as glass surfaces and mirror surfaces, displays, touch panels, smartphones, tablet PCs, thin film substrates, etc. It is useful for surface protection of various members of." In addition, in the column of Patent Document 4 "Effect of the Invention", there is a description that "the present invention can provide a display, more specifically, a flexible display." It should be noted that the flexible display assumes that the surface to which the product is adhered is flat when the sheet is adhered, and the flex resistance after that is planned. That is, it is clear from [Examples] and Table 1 showing the test results thereof that there is no plan to adhere to a fixed curved surface such as a spectacle lens.

In addition, in the column of Patent Document 5 [Effects of the Invention], it is stated that "If the double-sided adhesive tape for screen protection disclosed in this specification is used, rainbow unevenness will occur when it is attached to the screen of an electronic device or the like. It is possible to realize a screen protective member that is reduced and has excellent curved surface followability." However, the title of the invention, "Double-sided Adhesive Tape for Screen Protection," clearly does not envision spectacle lenses. It is true that Patent Document 5 describes that "it is excellent in curved surface followability" as described above, but it is clearly stated that it is also excellent in curved surface followability for a spherical surface that is curved in all directions, such as a spectacle lens. It has not been. It is also supported by the fact that the edge lift test is measured by wrapping around a cylinder with a diameter of 20 mm.

In the above configuration, the substrate layer of the double-sided adhesive laminate is formed of a non-stretched acrylic resin film, the strong adhesive layer is formed of an acrylic adhesive, and the weak adhesive layer is formed of a silicone adhesive. is desirable. Due to the former two configurations, the optical characteristics of the spectacle lens are less likely to deteriorate due to the excellent transparency and low retardation. The latter configuration facilitates re-sticking and is excellent in sticking workability and reworkability.

In each of the above configurations, the functional film can be a hard coat film or a protective film as well as the screen protective sheet. However, it is more desirable to use the functional film as an anti-fog film and the seal as an anti-fog film. Unlike conventional water-repellent coatings, there is no processing cost, and unlike special cloths and anti-fogging liquids, there is no need to deal with each use, and the anti-fogging property can be maintained for the required period. When it has deteriorated, the anti-fogging property can be easily restored by simply replacing it.

Moreover, in the above configuration, the antifogging film can be replaced with a light control film or a polarizing film. These functions can be added to the spectacle lens significantly compared to the injection molding of the light control agent layer or the embedding molding of the polarizing film layer. , can easily restore those functions.

The present invention also includes an aspect in which the spectacle lens stickers are packaged for each predetermined number of sheets, and an aspect in which various sizes of elliptical paper are bundled together with the material before being cut into the spectacle lens stickers. Included in the technical scope.

A plan view and a sectional view showing an example of the spectacle lens seal of the present invention.

Hereinafter, each configuration of the eyeglass lens seal of the present invention will be described in detail.

The raw material of the double-sided adhesive laminate 13 before cutting may be tape-shaped or sheet-shaped. The material of both adhesive laminates 13 includes a substrate layer 17, a weak adhesive layer 19, and a strong adhesive layer 21. If necessary, a release layer ( liner) 23 is formed. The double-sided adhesive laminate is not particularly limited as long as it has optical transparency and conformability to the lens spherical surface, and can be appropriately selected from commercially available double-sided tapes and sheets. is desirable.

Usually, the substrate layer 17 is desirably a non-stretched film (naturally transparent) from the viewpoint of followability to the lens spherical surface and low retardation. As the film material, acrylic, polycarbonate (PC), polyurethane (PU), cycloolefin polymer (COP), polyethylene terephthalate (PET), and the like may be used as long as they have flexibility to follow the spherical surface of the lens. In particular, an acrylic film with high transmittance is desirable. The thickness of the base material layer 17 is 5 to 60 μm, further 10 to 40 μm in the case of an acrylic film (see Patent Document 5 [0024]).

It is desirable to form the weak adhesive layer with a silicone-based adhesive from the viewpoint of reworkability (Patent Document 3 [Claim 1], Patent Document 4 [Claim 1], Patent Document 5 [Claim 1], [0023] etc.). The thickness of the weak adhesive layer is, for example, 30 to 80 μm in the case of a silicone-based adhesive layer. The strong adhesive layer may be made of urethane or the like, but if the substrate layer is an acrylic film, forming it with an acrylic adhesive ensures the adhesion between the substrate layer 17 and the functional film layer 15. (Claim 1] of Patent Document 3, Patent Document 5 [0031], etc.). The thickness of this strong adhesive layer is, for example, 10 to 30 μm in the case of an acrylic adhesive. The thickness of the "base material layer 17 + weak adhesive layer 19 + strong adhesive layer 21" of the double-sided adhesive laminate 13 is preferably 50 to 200 µm, more preferably 50 to 100 µm. If it is too thick, it may be difficult to ensure followability to the spherical surface of the lens (see Patent Document 5 [0023]).

Various functional film layers are attached to the strong adhesive layer 21 of the double-sided adhesive laminate 11 . When two or more functional film layers are used, a strong adhesive is applied between the functional film layers 15 for lamination.

The above functional films include those with optical functions such as anti-fogging, photochromic (light control), various filters (ultraviolet, blue light, infrared, specific wavelength cut) and polarizing. Examples include dirt films, antibacterial/virus films, and the like. These functional films can be appropriately selected from current or future marketed products. The base material for these functional films is not particularly limited as long as it is transparent and soft, and may be polyethylene terephthalate (PET), triacetyl cellulose (TAC), polycarbonate (PC), acrylic, cycloolefin polymer ( COP) system, polyurethane system, etc. can be used.

Examples are described below together with comparative examples. The double-sided adhesive laminate used in each example and each comparative example is described in "-Production of double-sided adhesive tape-" in Patent Document 5 [0030], "0031",
The "set thickness" was adjusted to 20 µm for non-stretched acrylic substrate layer, 50 µm for silicone-based weak adhesive layer, and 15 µm for acrylic strong-adhesive layer (total thickness of three layers: 85 µm). The double-sided adhesive laminates used in the comparative examples were the double-sided adhesive laminates of the examples in which the substrate layer was a biaxially stretched PET substrate layer.

<Example/Comparative Example 1>
After cutting each of the double-sided laminates for the above Examples and Comparative Examples into A4, the liner on the strong adhesive layer side was peeled off, and a commercially available TAC-based anti-fogging film (thickness: 120 μm), which was also cut into A4, was applied with a commercial laminator. pasted together. After that, each test piece was prepared by punching (cutting) with a Thomson die into an elliptical shape (axis diameter: 40 mm, vertical diameter: 25 mm) shown in FIG.

<Example/Comparative Example 2>
A test piece was prepared in the same manner as in Example 1 and Comparative Example 1, except that the functional film was a commercially available light control film (thickness: 100 μm) instead of the commercially available antifogging film.

<Example/Comparative Example 3>
A test piece was prepared in the same manner as in Example 1 and Comparative Example 1, except that a commercially available PVA polarizing film (thickness: 40 μm) was used as the functional film.

Each test piece prepared above was tested for the following items.
(a) Haze (cloudiness value) test:
The following haze values were measured with a haze meter according to JIS-K-7136.
Haze (%) = Td/Ttx100 (where Td: diffuse transmittance Tt: total light transmittance)
(b) Test for presence or absence of seal float:
After 24 hours from the preparation of the test piece, the floating state of the adhesive seal was visually observed and evaluated according to the following criteria.
○: No floating at all, △: The outer circumference looks slightly floating (within 1 mm),
x: The inside of the outer circumference of 1 mm or more appears to float.
(c) Test for the presence or absence of wrinkles on the seal: wrinkles After 24 hours from the preparation of the test piece, the state of wrinkles on the stuck seal was visually observed and evaluated according to the following criteria.
○: No wrinkles at all, △: Peripheral wrinkles (undulations) can be seen,
x: Wrinkles (undulations) are observed on all surfaces.

From Table 1 showing these test results, it can be seen that the evaluation items of each example are superior to the corresponding comparative examples. That is, each example has a smaller haze value than each corresponding comparative example and does not cause peeling, wrinkles, etc., whereas each comparative example having the same functional film layer has a haze value. It was confirmed that it was large and that air bubbles and wrinkles were generated.

11... Eyeglass lens seal 13... Double-sided adhesive laminate 15... Functional film layer 17... Base layer 19... Weak adhesive layer 21... Strong adhesive layer 23... Peeling layer (liner

Claims (7)

A spectacle lens seal that adds functionality to a spectacle lens,
comprising a double-sided adhesive laminate and a functional film layer,
The double-sided adhesive laminate comprises a substrate layer made of a non-stretched film, a weak adhesive layer formed on one side of the substrate layer and capable of being reattached to a spectacle lens, and a functional layer formed on the other side of the substrate layer. and a strong adhesive layer to which the adhesive film layer is attached,
The base material layer and the functional film layer have a thickness that can follow the spherical surface of the spectacle lens,
An eyeglass lens seal characterized by: The base layer of the double-sided adhesive laminate is formed of a non-stretched acrylic resin film, the strong adhesive layer is made of an acrylic adhesive, and the weak adhesive layer is made of a silicone adhesive. A seal for a spectacle lens, characterized by: 3. The spectacle lens sealing material according to claim 1, wherein said functional film layer is formed of an anti-fogging film. 3. The spectacle lens sealing material according to claim 1, wherein said functional film layer is formed of a light control film. 3. The spectacle lens seal according to claim 1, wherein the functional film layer is formed of a polarizing film. A set of spectacle lens seals, wherein the cut spectacle lens seals according to any one of claims 1 to 5 are packaged for each predetermined number of sheets. A set of eyeglass lens stickers according to any one of claims 1 to 5, characterized in that elliptical papers of various sizes are packaged together with the material before being cut into the eyeglass lens stickers.

Images