JP3550527B2 - Adhesive tape for plastic lens production - Google Patents

Description

【００３１】
表１から明らかなように、本発明実施例によるプラスチックレンズ製造用粘着テープを用いてプラスチックレンズを製造する場合は、欠けや、白濁などを生じさせることなくプラスチックレンズを製造することができ、特に、ガスバリヤー層を介して粘着剤層を形成した場合は、気泡の発生も完全に無くしてプラスチックレンズを製造できることが確認できた。
【００３２】
【発明の効果】
このように、本発明のプラスチックレンズ製造用粘着テープによれば、欠けや、白濁などを生じさせることなくプラスチックレンズを製造することができ、特に、ガスバリヤー層を介して粘着剤層を形成した場合は、気泡の発生も完全に無くしてプラスチックレンズを製造できるので、極めて収率よくプラスチックレンズを製造することができる。
【図面の簡単な説明】
【図１】本発明プラスチックレンズ製造用粘着テープの実施の形態を示す構造説明図
【図２】本発明プラスチックレンズ製造用粘着テープを使用したプラスチックレンズの製造例を示す説明図
【符号の説明】
１ 基材
２ 粘着剤層
３ 背面処理層
４ ガスバリヤー層
５ ガラス母型（上型）
６ ガラス母型（下型）
１０ プラスチックレンズ製造用粘着テープ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pressure-sensitive adhesive tape used for forming a cell composed of a pair of glass molds for producing a plastic lens by a casting method.
[0002]
[Prior art]
Conventionally, as this kind of pressure-sensitive adhesive tape, a polyethylene terephthalate film is used as a tape base material, and a rubber-based pressure-sensitive adhesive layer is provided on one surface of the base film, for example, as disclosed in JP-A-61-148282. Or an acrylic pressure-sensitive adhesive layer as disclosed in JP-A-5-255650, or a silicone-based pressure-sensitive adhesive layer as disclosed in JP-A-11-333868. Proposed.
[0003]
However, when a plastic lens is manufactured using these conventional adhesive tapes for manufacturing plastic lenses, moisture in the air, etc., penetrates the adhesive tape and penetrates into the cells, and is chipped around the cured plastic lens. There is a problem that cloudiness or white turbidity is generated or many air bubbles are generated. Therefore, an object of the present invention is to provide an adhesive tape for producing a plastic lens which can produce a plastic lens with high yield without causing chipping, clouding, and bubbles on the outer periphery of the cured plastic lens. is there.
[0004]
[Means for Solving the Problems]
The present inventors have conducted various studies with the aim of providing an adhesive tape capable of producing a plastic lens with high yield without causing chipping, clouding, and bubbles on the outer periphery of the cured plastic lens, and as a result, a platinum-based plastic lens was obtained. By forming a pressure-sensitive adhesive layer of a specific thickness consisting of an addition-reaction-type silicone resin, a plastic lens can be produced without chipping, clouding, or bubbles even when using an adhesive tape for producing a plastic lens made of polyethylene terephthalate film. And that the pressure-sensitive adhesive layer was provided on one side of the film substrate with a gas barrier layer interposed therebetween, so that no bubbles were generated around the cured plastic lens.
The adhesive tape for manufacturing a plastic lens of the present invention has been made based on such knowledge, and as described in claim 1 , an overlapping portion is provided around a glass matrix for manufacturing a plastic lens, and is adhered and fixed, After peeling off the overlapped portion and injecting the monomer into the glass mold, again, an adhesive tape for plastic lens production to be overlapped and adhered , on one side of a base material made of a polyethylene terephthalate film having a thickness of 22 to 40 μm, An adhesive layer made of a platinum-based addition reaction type silicone resin having a thickness of 10 to 40 μm is provided, and the adhesive layer has an adhesive force of 3.9 to 14.7 N / 25 mm, a holding force of 3 to 10 minutes, and a peeling force of 3 to its own back surface. 9.9 to 9.8 N / 25 mm.
According to a second aspect of the present invention, there is provided a pressure-sensitive adhesive tape for producing a plastic lens, wherein the pressure-sensitive adhesive layer is provided on one surface of the substrate via a gas barrier layer. And
The pressure-sensitive adhesive tape for producing a plastic lens according to claim 3 is a pressure-sensitive adhesive tape for producing a plastic lens according to claim 1 or 2, wherein a back surface treatment layer is provided on a surface of the substrate opposite to a surface on which the pressure-sensitive adhesive layer is provided. Is provided.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
In one embodiment (not shown) of the pressure-sensitive adhesive tape for producing a plastic lens of the present invention, a pressure-sensitive adhesive layer is provided on one surface of a substrate made of a polyethylene terephthalate film.
FIG. 1 shows another embodiment of the pressure-sensitive adhesive tape 10 for producing a plastic lens of the present invention. As shown in the drawing, the side opposite to the surface of the substrate 1 made of a polyethylene terephthalate film on which the pressure-sensitive adhesive layer 2 is provided. It is preferable to provide the back surface treatment layer 3 on the surface of the substrate. Further, as shown in the figure, it is preferable that the pressure-sensitive adhesive layer 2 is provided on one surface of the substrate 1 film via a gas barrier layer 4.
FIG. 2 is an explanatory view showing a production example of a plastic lens using the above-mentioned pressure-sensitive adhesive tape 10 for producing a plastic lens of the present invention. This shows a state in which the gap of the lower mold 6) is sealed with the adhesive tape 10 of the present invention.
[0006]
The thickness of the polyethylene terephthalate film constituting the base material 1 of the pressure-sensitive adhesive tape 10 for producing a plastic lens needs to be 22 to 40 μm. This is because if it is less than 22 μm, the workability is poor because the winding of the tape cannot be performed uniformly, and if it exceeds 40 μm, the lens becomes chipped or clouded. That is, when the base material 1 is thickened, a gap is formed in the overlap portion of the adhesive tape wound around the glass matrix, and air is sucked from the portion during monomer polymerization to cause chipping. This is because white turbidity occurs in the portion.
[0007]
Further, when the water vapor transmission rate (JIS Z 0208) of the base material 1 is 40 g / m ² · 24 hr or less, the generation of air bubbles can be suppressed except for the peripheral portion of the obtained plastic lens, which is preferable. Further, when the pressure-sensitive adhesive layer 2 is provided via the gas barrier layer 4 as shown in FIG. 1, the water vapor permeability of the substrate 1 provided with the gas barrier layer 4 can be 3 g / m ² · 24 hr or less. This is more preferable because it suppresses the generation of bubbles at the peripheral portion of the plastic lens. Such a gas barrier layer 4 may be provided on the side of the base material opposite to the side on which the pressure-sensitive adhesive layer 2 is provided, but as shown in FIG. It is preferable to intervene.
[0008]
The gas barrier layer 4 can be composed of a vapor deposition layer or a sputtering layer of alumina or silica. The thickness of the gas barrier layer 4 is not particularly limited as long as the pressure-sensitive adhesive tape of the present invention does not become opaque. This means that if the adhesive tape is not transparent, when injecting the monomer into the glass matrix, the liquid level will not be visible, so too much monomer will be added and overflow will worsen the workability, and conversely, the amount of monomer will be small In such a case, the lens becomes inhomogeneous.
[0009]
The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 2 provided on one surface of the substrate 1 needs to be platinum-based addition-reaction silicone. This is because the peroxide cross-linking type causes cloudiness in the plastic lens. That is, silicone pressure-sensitive adhesives are broadly classified into platinum-based addition reaction type and peroxide cross-linking type depending on the cross-linking type. In the present invention, it is essential to use the former addition-reaction type silicone pressure-sensitive adhesive.
The addition reaction type silicone pressure-sensitive adhesive is obtained by crosslinking 100 parts by weight of a main component composed of 100 parts by weight of a silicone gum containing a vinyl group as an elastomer component and 50 to 200 parts by weight of a silicone resin as a pressure-sensitive adhesive-providing component. A curing agent is added by adding 0.01 to 5 parts by weight of methyl hydrogen polysiloxane as an agent and 0.01 to 5 parts by weight of a platinum-based catalyst as a catalyst.
[0010]
The thickness of the pressure-sensitive adhesive layer 2 needs to be 10 to 40 μm. This is because if it is less than 10 μm, it becomes difficult to adhere to the glass matrix, and the plastic lens monomer liquid may leak from the glass matrix, and if it exceeds 40 μm, chipping of the lens occurs.
[0011]
Further, the adhesive strength of the adhesive layer 2 needs to be 3.9 to 14.7 N / 25 mm (JIS Z0237 180 degree peeling method). This is because if the adhesive strength is less than 3.9 N / 25 mm, tape peeling and liquid leakage may occur. On the other hand, if the adhesive force exceeds 14.7 N / 25 mm, the adhesive may be left on the lens in the step of peeling off the tape after molding the lens, or the lens may be difficult to peel off. It is because it becomes.
[0012]
In addition, the holding power of the pressure-sensitive adhesive layer 2 is measured at 130 ° C. in a measurement atmosphere with respect to the surface of the substrate 1 opposite to the surface on which the pressure-sensitive adhesive layer 2 is provided, or the back surface of the back surface treatment layer 3. , A load of 1 kg, and an adhesion area of 25 mm × 25 mm for 3 to 10 minutes. This is because if the holding force is less than 3 minutes, the tape may be peeled off from the matrix during molding. Also, if the holding force exceeds 10 minutes, chipping of the lens occurs. Although the reason is not clear, it is considered that the tackiness of the pressure-sensitive adhesive is reduced, and air is likely to suddenly enter the matrix.
[0013]
Moreover, the peeling force (JIS Z0237 180-degree peeling method) of the tape against its own back surface needs to be 3.9 to 9.8 N / 25 mm. This is because if the peeling force is less than 3.9 N / 25 mm, the overlapping portion of the tape will peel off, causing liquid leakage, and if the peeling force exceeds 9.8 N / 25 mm, it will be difficult to develop and attach the tape. This is because
[0014]
In addition, it is preferable to provide a back surface treatment layer 3 on the surface of the base material 1 opposite to the surface on which the pressure-sensitive adhesive layer 2 is provided, because the holding force can be easily adjusted. The back surface treatment is not particularly limited as long as it uses a treatment agent having releasability from the silicone pressure-sensitive adhesive. For example, back surface treatment with a long-chain alkyl-based release agent of polyvinyl carbamate is preferable. The thickness of the back surface treatment layer 3 is not particularly limited, but is usually 0.01 to 0.5 μm.
[0015]
It should be noted that an adhesion improving treatment between the base material 1 and the pressure-sensitive adhesive layer 2 is not particularly required, but if it is performed, treatment using a silane coupling agent or a silicone-based adhesion enhancer, corona discharge Treatment, ozone treatment, or the like may be performed.
[0016]
【Example】
Hereinafter, specific examples of the adhesive tape for producing a plastic lens of the present invention will be described together with comparative examples. In addition, all the parts by weight used below mean solid content conversion.
[0017]
(Example 1)
Biaxially oriented polyethylene terephthalate film of water vapor permeability ^{28 g} / m 2 · 24 hr or a thickness of 25μm as a substrate (Toray Lumirror 25S-10) using a single-sided silicone gum 100 parts by weight of this base film 1 part by weight of a cross-linking agent and 0.9 part by weight of a platinum-based catalyst were added to 100 parts by weight of a silicone pressure-sensitive adhesive composed of 150 parts by weight of a silicone resin and having a solid content of 60% with a solvent toluene. Pressure-sensitive adhesive layer (SD4570 manufactured by Dow Corning Silicone Co., Ltd.) coated with a roll knife coater, heated at 130 ° C. for 120 seconds and dried to a thickness of 15 μm. Was formed to prepare an adhesive tape for producing a plastic lens.
[0018]
Next, as shown in FIG. 2, the two glass molds (upper mold 5 and lower mold 6) are arranged vertically so that the gap is 5 mm, and the above-mentioned glass mold having a width of 25 mm is formed around the glass mold. The adhesive tape was wrapped around once, and affixed and fixed so as to provide a 10 mm-long overlapping portion. Next, after peeling off the overlapped portion and injecting the monomer into the glass matrix, the adhesive tape was again laminated and adhered, and the temperature was raised from 40 ° C to 130 ° C over 4 hours, and further at 130 ° C for 10 hours. The monomer was cured by heating to produce a plastic lens. Table 1 shows the properties of the obtained pressure-sensitive adhesive tape, the workability during the production of plastic lenses, and the properties of the obtained lenses.
[0019]
(Example 2)
As the substrate, a biaxially stretched polyethylene terephthalate film of water vapor permeability ^{18 g} / m 2 · 24 hr or at thickness 38 [mu] m (Toray Lumirror 38S-10) using a long-chain alkyl on one surface of the substrate film Applying a system release agent with a Meyer bar coater, heating at 100 ° C. for 30 seconds to form a back treatment layer having a thickness of 0.05 μm after drying, and forming a back treatment layer of the base film. An adhesive layer having a thickness of 20 μm was formed on the uncoated surface using the same silicone adhesive (SD4570 manufactured by Dow Corning Silicone Co., Ltd.) as in Example 1, and an adhesive tape for producing plastic lenses was used. It was created.
Using the obtained adhesive tape, a plastic lens was manufactured in the same manner as in Example 1. Table 1 shows the properties of the obtained pressure-sensitive adhesive tape, the workability during the production of plastic lenses, and the properties of the obtained lenses.
[0020]
(Example 3)
As the substrate, an alumina vapor deposited polyethylene terephthalate film water vapor transmission rate at a thickness 38μm is 1.5g ^/ m 2 · 24hr (Toyo Metallizing Co., VM- polyethylene terephthalate film 1011HG) was used to this base An adhesive tape for producing a plastic lens was produced in the same manner as in Example 2 except that a back surface treatment layer similar to that of Example 2 was formed on the film.
Using the obtained adhesive tape, a plastic lens was manufactured in the same manner as in Example 1. Table 1 shows the properties of the obtained pressure-sensitive adhesive tape, the workability during the production of plastic lenses, and the properties of the obtained lenses.
[0021]
(Example 4)
A pressure-sensitive adhesive tape for producing a plastic lens was prepared in the same manner as in Example 2 except that a 15-μm-thick silicone pressure-sensitive adhesive layer was formed using a silicone pressure-sensitive adhesive (SD4570, manufactured by Dow Corning Silicone Co., Ltd.). did.
Using the obtained adhesive tape, a plastic lens was manufactured in the same manner as in Example 1. Table 1 shows the properties of the obtained pressure-sensitive adhesive tape, the workability during the production of plastic lenses, and the properties of the obtained lenses.
[0022]
(Example 5)
A pressure-sensitive adhesive tape for producing a plastic lens was prepared in the same manner as in Example 2, except that a 30-μm-thick silicone pressure-sensitive adhesive layer was formed with a silicone pressure-sensitive adhesive (SD4570, manufactured by Dow Corning Silicone Co., Ltd.). did.
Using the obtained adhesive tape, a plastic lens was manufactured in the same manner as in Example 1. Table 1 shows the properties of the obtained pressure-sensitive adhesive tape, the workability during the production of plastic lenses, and the properties of the obtained lenses.
[0023]
(Comparative Example 1)
As the substrate, a biaxially stretched polyethylene terephthalate film of water vapor permeability ^{32 g} / m 2 · 24 hr or at thickness 19 .mu.m (Toray Lumirror 19F71) for plastic lenses produced in the same manner as in Example 2 except for using an adhesive Created a tape.
Using the obtained adhesive tape, a plastic lens was manufactured in the same manner as in Example 1. Table 1 shows the properties of the obtained pressure-sensitive adhesive tape, the workability during the production of plastic lenses, and the properties of the obtained lenses.
[0024]
(Comparative Example 2)
As the substrate, a biaxially stretched polyethylene terephthalate film of water vapor permeability ^{14 g} / m 2 · 24 hr or a thickness 50 [mu] m (Toray Lumirror 50S-10) a plastic lens produced in the same manner as in Example 2 except for using a Adhesive tape was prepared.
Using the obtained adhesive tape, a plastic lens was manufactured in the same manner as in Example 1. Table 1 shows the properties of the obtained pressure-sensitive adhesive tape, the workability during the production of plastic lenses, and the properties of the obtained lenses.
[0025]
(Comparative Example 3)
1 part by weight of a crosslinking agent and 0.9 part by weight of a platinum-based catalyst were added to 100 parts by weight of the main component of a silicone adhesive having a solid content of 60%, comprising 67 parts by weight of silicone resin and 100 parts by weight of silicone gum. Pressure-sensitive adhesive tape for plastic lens production in the same manner as in Example 2 except that a 20 μm-thick pressure-sensitive adhesive layer was formed using a silicone pressure-sensitive adhesive (SD4576, manufactured by Dow Corning Silicone Co., Ltd.) It was created.
Using the obtained adhesive tape, a plastic lens was manufactured in the same manner as in Example 1. Table 1 shows the properties of the obtained pressure-sensitive adhesive tape, the workability during the production of plastic lenses, and the properties of the obtained lenses.
[0026]
(Comparative Example 4)
1 part by weight of a cross-linking agent and 0.9 part by weight of a platinum-based catalyst were added to 100 parts by weight of a main component of a silicone adhesive having a solid content of 186 parts by weight and 186 parts by weight of silicone resin based on 100 parts by weight of silicone gum. Pressure-sensitive adhesive tape for producing plastic lenses in the same manner as in Example 2, except that a 50 μm-thick pressure-sensitive adhesive layer was formed using a silicone pressure-sensitive adhesive (SD4574, manufactured by Dow Corning Silicone Co., Ltd.) manufactured by Toray Industries, Inc. It was created.
Using the obtained adhesive tape, a plastic lens was manufactured in the same manner as in Example 1. Table 1 shows the properties of the obtained pressure-sensitive adhesive tape, the workability during the production of plastic lenses, and the properties of the obtained lenses.
[0027]
(Comparative Example 5)
The same procedure as in Example 2 was carried out except that a peroxide-curable silicone pressure-sensitive adhesive (SH4280, manufactured by Dow Corning Silicone Co., Ltd., manufactured by Toray Industries, Inc.) was used as the silicone pressure-sensitive adhesive. Thus, an adhesive tape for producing a plastic lens was prepared.
Using the obtained adhesive tape, a plastic lens was manufactured in the same manner as in Example 1. Table 1 shows the properties of the obtained pressure-sensitive adhesive tape, the workability during the production of plastic lenses, and the properties of the obtained lenses.
[0028]
(Comparative Example 6)
A pressure-sensitive adhesive tape for producing a plastic lens was prepared in the same manner as in Example 2, except that a pressure-sensitive adhesive layer having a thickness of 9 μm was formed with a silicone pressure-sensitive adhesive (SD4570, manufactured by Dow Corning Silicone Co., Ltd.). did.
Using the obtained adhesive tape, a plastic lens was manufactured in the same manner as in Example 1. Table 1 shows the properties of the obtained pressure-sensitive adhesive tape, the workability during the production of plastic lenses, and the properties of the obtained lenses.
[0029]
(Comparative Example 7)
100 parts by weight of silicone resin, 150 parts by weight of silicone resin, 100 parts by weight of silicone resin, 100 parts by weight of a silicone adhesive having a solid content of 60%, 0.2 part by weight of a crosslinking agent, and 0.1 part by weight of a platinum-based catalyst. Example 2 except that a 20 μm-thick pressure-sensitive adhesive layer was formed using a silicone pressure-sensitive adhesive (SD4570, manufactured by Dow Corning Silicone Co., Ltd.) to which 9 parts by weight was added. In the same manner, an adhesive tape for producing a plastic lens was prepared.
Using the obtained adhesive tape, a plastic lens was manufactured in the same manner as in Example 1. Table 1 shows the properties of the obtained pressure-sensitive adhesive tape, the workability during the production of plastic lenses, and the properties of the obtained lenses.
[0030]
[Table 1]

[0031]
As is clear from Table 1, when the plastic lens is manufactured using the adhesive tape for manufacturing a plastic lens according to the embodiment of the present invention, the plastic lens can be manufactured without causing chipping or clouding. In the case where the pressure-sensitive adhesive layer was formed via the gas barrier layer, it was confirmed that a plastic lens can be produced without completely generating bubbles.
[0032]
【The invention's effect】
As described above, according to the pressure-sensitive adhesive tape for producing a plastic lens of the present invention, a plastic lens can be produced without causing chipping or clouding, and in particular, a pressure-sensitive adhesive layer is formed via a gas barrier layer. In this case, a plastic lens can be manufactured without generating bubbles completely, so that a plastic lens can be manufactured with extremely high yield.
[Brief description of the drawings]
FIG. 1 is a structural explanatory view showing an embodiment of an adhesive tape for producing a plastic lens of the present invention. FIG. 2 is an explanatory view showing an example of producing a plastic lens using the adhesive tape for producing a plastic lens of the present invention.
DESCRIPTION OF SYMBOLS 1 Base material 2 Adhesive layer 3 Back surface treatment layer 4 Gas barrier layer 5 Glass matrix (upper type)
6 glass mold (lower mold)
10 Adhesive tape for plastic lens production

Claims (3)

A plastic lens manufacturing method in which an overlapping portion is provided around a glass mold for manufacturing a plastic lens, and is adhered and fixed, and the overlapped portion is peeled off, a monomer is injected into the glass mold, and then again laminated. Pressure-sensitive adhesive tape, provided on one side of a base material made of a polyethylene terephthalate film having a thickness of 22 to 40 μm, provided with an adhesive layer made of a platinum-based addition reaction type silicone resin having a thickness of 10 to 40 μm, and the adhesive force of the adhesive layer 3.9 to 14.7 N / 25 mm, a holding force of 3 to 10 minutes, and a peeling force of 3.9 to 9.8 N / 25 mm on the self-rear surface. The pressure-sensitive adhesive tape for producing a plastic lens according to claim 1, wherein the pressure-sensitive adhesive layer is provided on one surface of the base material via a gas barrier layer. The pressure-sensitive adhesive tape for producing a plastic lens according to claim 1 or 2, wherein a back surface treatment layer is provided on a surface of the substrate opposite to a surface on which the pressure-sensitive adhesive layer is provided.

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