KR102082326B1 - Adhesive tape for molding plastic lens and method for molding plastic lens molded article - Google Patents

Abstract

It is possible to mold the molded article of plastic lens with high precision, and it is possible to suppress the occurrence of scratches, whitening and adhesive residue on the outer circumferential surface of the molded article, and to produce a molded article with good precision even after long-term storage. Providing an adhesive tape for.
The pressure-sensitive adhesive layer is composed of a pressure sensitive adhesive mainly composed of a silicone pressure sensitive adhesive, and the silicone pressure sensitive adhesive includes an alkenyl group-containing silicone pressure sensitive adhesive and an alkenyl group-free silicone pressure sensitive adhesive, and contains 50 to 70 parts by weight of an alkenyl group-containing silicone pressure sensitive adhesive and no alkenyl group free. 30-50 weight part of silicone adhesives, a crosslinking agent, and a catalyst are comprised from the adhesive mix | blended so that it may be 0.5-1.5 weight part with respect to an alkenyl-group containing silicone adhesive, The polyorganosiloxane gum (G) and silicone resin ( The composition ratio of R) is an adhesive mix | blended so that polyorganosiloxane gum (G) may be 36-44 weight part and silicone resin (R) 56-64 weight part, and 70 degreeC holding force of an adhesive tape is 80 minutes or more and 300 minutes It is below, and it is characterized in that adhesive force is 2.0N / 10mm or more and 6.0N / 10mm or less.

Description

Adhesive tape for plastic lens molding and molding method of plastic lens molded article {ADHESIVE TAPE FOR MOLDING PLASTIC LENS AND METHOD FOR MOLDING PLASTIC LENS MOLDED ARTICLE}

The present invention relates to a plastic lens molding adhesive tape and a plastic lens molding method used for producing a standard molded article having the same thickness and curvature as a final product as a plastic lens such as a plastic spectacle lens or an optical lens.

As a manufacturing method of the conventional plastic lens, the method of shaping | molding by the casting polymerization method using a pair of glass mold (mold) and the adhesive tape for sealing is known (for example, refer patent document 1 and patent document 2). . In this method, a pair of glass molds are opposedly arranged at predetermined intervals. Next, the adhesive tape is affixed along the circumferential direction over the whole circumference of the outer peripheral surface of a pair of glass mold, and a polymerization cell is produced. For this reason, the space between glass molds is sealed with an adhesive tape. Next, the nozzle for resin injection is inserted in this adhesive tape, and a liquid resin (polymerizable monomer) is inject | poured and filled in the space between glass molds. Then, the plastic lens molded article is obtained by polymerizing and curing the resin by heating, light irradiation or the like.

In molding of the resin (polymerizable monomer), with the temperature rise of the resin, thermal expansion occurs first, and the volume increases (expands). At this time, if the cohesive force of an adhesive is used larger than necessary as a sealing adhesive tape, it cannot follow the expansion of the volume of this resin, and a gap will arise in the adhesive surface of an adhesive tape and a mold, or the part which an adhesive tape wraps. , Leakage of resin occurs. Therefore, there was a fear that scratches occurred in the molded lens. For this reason, as mentioned above, the shaping | molding method of the plastic lens which used cohesive force more than needed as an adhesive tape for sealing was not suitable for manufacture of a standard molded article. Patent documents 2 and 3 propose the technique which suppresses generation | occurrence | production of a scratch, turbidity, foam | bubble, etc. in the above-mentioned plastic lens. However, even in such a technique, depending on the type of resin (polymerizable monomer) of the lens and the lens molding conditions, there was a case that the occurrence of scratches due to the leakage of the resin could not be sufficiently suppressed due to the adhesive.

If the temperature of this resin is further increased, polymerization hardening will start, and this time, volume will shrink by hardening shrinkage. At this time, when the cohesive force of the adhesive is smaller than necessary as the sealing adhesive tape, as shown in FIG. 4, the adhesive layer (not shown) of the adhesive tape 100 can sufficiently fix the outer peripheral surface of the mold 30. In this case, the mold 30 causes a shift in the shrinking direction of the resin. For this reason, the space | interval of a pair of mold 30 becomes narrower than at the time of resin injection. Therefore, there is a concern that the thickness of the molded lens becomes thinner than the desired thickness (thickness change). As mentioned above, the shaping | molding method of the plastic lens which used the thing with a small cohesion force more than needed as an adhesive tape for sealing was not suitable for manufacture of a standard molded article. For this reason, in the molding method of the above-mentioned plastic lens, the influence of the adhesive property of the adhesive tape to be used is large, and the thickness and curvature which are the same as the final product as plastic lenses, especially the spectacle lens and the optical lens of plastics, among others. It was difficult to stably manufacture a standard molded article having a good yield.

In addition, after completion | finish of hardening reaction of resin, the polymerization cell is cooled to about 20 degreeC-about 50 degreeC, and the plastic lens which is a molded article is removed from the mold 30. As shown in FIG. At this time, if the cohesion force of the adhesive tape in this temperature range is smaller than necessary, the adhesiveness between the adhesive tape and the mold becomes high, and the adhesive of the adhesive tape remains on the mold, so that a treatment step of separately washing and regenerating the used mold is necessary. There was a concern. For this reason, depending on the type of the mold and the lens molding conditions, there was a case that the generation of the adhesive residue in the mold could not be sufficiently suppressed due to the adhesive.

Since the adhesive of the adhesive tape for plastic lens molding mentioned above requires flexibility and excellent solvent resistance, a silicone adhesive is often used rather than an acrylic adhesive or a rubber adhesive. This silicone pressure sensitive adhesive is largely divided into two types according to the curing mechanism. One of them is a silicone pressure-sensitive adhesive which cures by radical reaction using an organic peroxide as a curing agent, and the other one is directly connected to the alkenyl group of the polyorganosiloxane gum and the silicon atom of the polyorganohydrogensiloxane (crosslinking agent) ( It is a silicone pressure sensitive adhesive which hardens by addition reaction between hydrogen.

In the radical reactive silicone pressure sensitive adhesive (peroxide reactive silicone pressure sensitive adhesive), the crosslinking density is adjusted by the amount of the organic peroxide which is a hardening agent effective for this reaction, but the amount of generation of the radicals is largely dependent on the ambient temperature, and this becomes an instability factor. It is difficult to stably obtain a desired crosslinking density. On the other hand, in the addition-reactive silicone pressure-sensitive adhesive, the crosslinking density is adjusted by the amount of the crosslinking agent, but since the reaction rate is slower than that of the radical reaction, the crosslinking density is greatly changed by the content of the alkenyl group, and the crosslinking is caused by the passage of the date. There exists a possibility that a density may increase, and it is difficult to obtain desired crosslinking density stably.

In addition, as a pressure-sensitive adhesive of the adhesive tape for plastic lens molding, a silicone pressure-sensitive adhesive which is generally used contains a low molecular weight siloxane (mainly a 3 to 20-membered ring or linear dimethylpolysiloxane) as an impurity. At the time of polymerization, such impurities are eluted from the pressure-sensitive adhesive layer and incorporated into the resin. Thus, in the past, there was a fear that the above-mentioned cloudiness occurred in the inner and outer peripheral parts of the plastic lens after curing.

As described above, molding a standard molded article having the same thickness and curvature as the final product as a plastic lens with good precision, and also scratches or whitening of the outer circumferential surface of the molded standard molded article, and adhesive residue on the mold In order to provide an adhesive tape for plastic lens molding and a molding method of the plastic lens which can be used stably even after long-term storage, it is possible to obtain good quality products with good yield. The proper design and molding method of the silicone pressure sensitive adhesive have not yet been fully understood and reviewed.

Japanese Patent Laid-Open No. 1-257016 Japanese Patent Laid-Open No. 2003-193004 Japanese Patent Laid-Open No. 2001-316645

Accordingly, the present invention has been made in view of the above-described problems, and it is possible to mold a standard molded article having the same thickness and curvature as the final product as a plastic lens with good accuracy, and furthermore, It is an object of the present invention to provide a plastic lens molding adhesive tape and a molding method of a plastic lens which can suppress the occurrence of scratches, whitening, and residual adhesive in the mold, and which can be stably used even after long-term storage.

MEANS TO SOLVE THE PROBLEM In order to solve the subject mentioned above and to achieve the objective, the aspect of this invention sticks along the outer peripheral surface of a pair of mold which opposingly arranged at predetermined intervals, seals the space formed between a pair of mold, and is made of plastic In the adhesive tape for plastic lens molding used to form a cavity filling the polymerizable monomer of the lens, the adhesive tape includes a band-shaped substrate and an adhesive layer for adhering the substrate to the outer peripheral surface of the mold, This adhesive layer is comprised from the adhesive which has a silicone adhesive as a main component, (1) Silicone adhesive contains the silicone adhesive containing an alkenyl group, and the silicone adhesive which does not contain an alkenyl group, (2) Contains an alkenyl group 50 to 70 parts by weight of one silicone pressure-sensitive adhesive, (3) 30 to 50 parts by weight of silicone pressure-sensitive adhesive containing no alkenyl group, (4) a crosslinking agent and a catalyst to an alkenyl group It consists of the adhesive mix | blended so that it may be 0.5-1.5 weight part with respect to the silicone adhesive contained, The composition ratio of polyorganosiloxane gum (G) and silicone resin (R) in this silicone adhesive is (5) polyorganosiloxane gum ( G) It is 36-44 weight part and (6) Adhesives mix | blended so that silicone resin (R) may be 56-64 weight part, (7) 70 degreeC holding force of the said adhesive tape is 50 minutes or more, 500 minutes or less, ( 8) The adhesive strength is 2.0N / 10mm or more, 6.0N / 10mm or less.

As said aspect, it is preferable that the total amount of the low molecular siloxane (cyclic or linear polyorganosiloxane) of 3-10 monomer contained in the silicone adhesive which is a main component of an adhesive layer is 165 microgram / g or less.

(Holding power after preservation)

As said aspect, it is preferable that the holding force in 70 degreeC after leaving for 3 months at 40 degreeC based on JISZO237 (ISO 29862) of an adhesive tape is 50 minutes or more and 500 minutes or less. The holding force at 70 ° C. after being left at 40 ° C. for 3 months is the same range as 50 minutes to 500 minutes, which is the initial 70 ° C. holding force, so that a sufficient fixing force against curing shrinkage of the monomer resin of the lens even after storage is obtained. Followability to thermal expansion can be ensured.

As said aspect, it is preferable that the dimethyl polysiloxane content of the trimer or more and 20 monomers contained in the silicone adhesive which is a main component of an adhesive layer is 4850 micrograms or less per 1g of adhesives which comprise an adhesive layer.

As said aspect, it is preferable that the dimethyl polysiloxane content of the trimer or more and 10 or less body contained in the silicone adhesive which is a main component of an adhesive layer is 165 micrograms or less per 1g of adhesives which comprise this adhesive layer.

As said aspect, it is more preferable that the dimethyl polysiloxane content of the trimer or 10-mers contained in the silicone adhesive which is a main component of an adhesive layer is 50 micrograms or less per 1g of adhesives which comprise this adhesive layer.

According to another aspect of the present invention, in a molding method of a plastic lens molded article using the above-mentioned adhesive tape for plastic lens molding, a pair of molds are disposed to face each other at a predetermined interval, and the plastic lens is disposed on the outer peripheral surface of the pair of molds. A cavity forming step of forming a cavity filled with a polymerizable monomer by attaching a molding adhesive tape, sealing a space formed between a pair of molds, a monomer filling step of filling a polymerizable monomer in the cavity, and filling in the cavity It is characterized by including a polymerization step for polymerizing the polymerizable monomer.

According to the molding method of the plastic lens molding adhesive tape and the plastic lens molded article according to the present invention, it is possible to mold the standard molded article having the same thickness and curvature as the final product as the plastic lens with high precision, and It is possible to suppress scratches and whitening of the outer circumferential surface and generation of pressure-sensitive adhesive residue on the mold. Moreover, since the change of the cohesion force of the adhesive in the storage of a date has little, even if the adhesive tape after long-term storage is used, it becomes possible to shape a plastic lens with the high precision as mentioned above.

1 is a cross-sectional view of an adhesive tape for plastic lens molding according to an embodiment of the present invention.
2 is an explanatory diagram showing a molding method of a plastic lens molded article according to an embodiment of the present invention.
It is a figure which shows the relationship of the cohesion force of the adhesive tape for plastic lens molding, resin temperature, and resin volume.
4 is an explanatory diagram showing variation in the thickness of a molded article accompanying monomer shrinkage during plastic lens molding.

EMBODIMENT OF THE INVENTION Below, the detail of the shaping | molding method of the plastic lens molding adhesive tape (henceforth an adhesive tape) and plastic lens molded article (finish lens) which concerns on embodiment of this invention is demonstrated based on drawing. It should be noted, however, that the drawings are schematic, and that the dimensions, ratios, and the like of each member differ from those in reality. Moreover, the part from which the relationship and the ratio of a mutual dimension differ also in between drawings is contained.

[Configuration of Adhesive Tape for Plastic Lens Molding]

FIG. 1: is sectional drawing which shows the state which cut | disconnected the adhesive tape for plastic lens molding which concerns on this embodiment in the width direction, and FIG. 2 is a figure explaining the shaping | molding method of the plastic lens molded article which concerns on this embodiment. In addition, a plastic lens molded article is a molded article which has the thickness and curvature of a plastic lens as a final product in the shape | molded state, and means the semi-finished product which final processing is performed and becomes a plastic lens.

As shown in FIG. 2, the adhesive tape 1 for plastic lens shaping | molding concerning this embodiment is stuck along the outer peripheral surface of the pair of mold 30 which opposingly arranged at predetermined intervals, and a pair of mold ( The space formed between 30 and 30 is sealed and used to form the cavity C filling the polymerizable monomer of the plastic lens. As shown in FIG. 1, the adhesive tape 1 for plastic lens molding which concerns on this embodiment is a substantially whole surface of the strip | belt-shaped tape base material 2 and the single side | surface of this tape base material 2 ), The pressure-sensitive adhesive layer 3 is provided.

The adhesive layer 3 is comprised from the adhesive which has a silicone adhesive as a main component. (1) Silicone adhesive contains the silicone adhesive containing an alkenyl group, and the silicone adhesive which does not contain an alkenyl group. (2) The compounding ratio of the silicone adhesive containing an alkenyl group is 50-70 weight part, and the compounding ratio of the (3) silicone adhesive which does not contain an alkenyl group is 30-50 weight part. (4) A crosslinking agent and a catalyst are mix | blended so that it may be 0.5-1.5 weight part with respect to the silicone adhesive containing (2) alkenyl group. The composition ratio of polyorganosiloxane gum (G) and silicone resin (R) in the said silicone adhesive is (5) polyorganosiloxane gum (G) is 36-44 weight part, On the other hand, (6) silicone resin ( It is mix | blended so that R) may be 56-64 weight part. And the adhesive is characterized by (7) 70 degreeC holding force of the said adhesive tape 50 minutes or more and 500 minutes or less, and (8) adhesive force of 2.0N / 10mm or more and 6.0N / 10mm or less.

Generally, a silicone adhesive consists of a polyorganosiloxane gum (G) and silicone resin (R) which is a tackifier. Polyorganosiloxane gum (G) is a high molecular weight oil whose skeleton structure consists of D units. Silicone resin (R) is a low molecular weight resin in which the skeleton structure formed the three-dimensional crosslinked structure which consists of M unit and Q unit. In addition, the presence or absence of the alkenyl group in a silicone adhesive is as follows. That is, an alkenyl group adheres to the side chain of polyorganosiloxane gum (G), and becomes a crosslinking point which reacts with the hydrosilyl group of the crosslinking agent mentioned later. For this reason, the silicone adhesive which does not contain an alkenyl group is a silicone adhesive which does not have a crosslinking point in polyorganosiloxane gum (G). Therefore, the silicone adhesive containing an alkenyl group is a silicone adhesive which consists of a polyorganosiloxane gum (G) and silicone resin (R) which have a crosslinking point. In addition, the silicone adhesive which does not contain an alkenyl group is a silicone adhesive which consists of a polyorganosiloxane gum (G) and silicone resin (R) which do not have a crosslinking point.

[Forming Method of Plastic Lens Molded Products]

Next, the method of shape | molding a plastic lens molded article using this adhesive lens 1 for plastic lens molding is demonstrated. The shaping | molding method of the plastic lens molded article which concerns on this embodiment includes a cavity formation process, a monomer filling process, and a polymerization process. The shaping | molding method of the plastic lens molded article which concerns on this invention is not limited to these processes, You may also include other processes suitably according to the objective.

(Cavity forming process)

First, as shown in FIG. 2, for example, a pair of molds 30 and 30 formed of glass forming a substantially disk shape are disposed to face each other at a predetermined interval (interval of the thickness of the plastic lens molded article). Let's do it. Then, the adhesive tape 1 is attached to the outer circumferential surface of the pair of molds 30 and 30 formed of glass so as to surround the circumferential direction. As a result, the pair of molds 30 and 30 seal the space formed between the pair of molds 30 and 30 while maintaining the gap. As shown in FIG. 2, while the molds 30 and 30 are connected in parallel with each other, a plate-like or cylindrical cavity C is partitioned therebetween, whereby a polymerization cell is produced. .

Monomer Filling Process

And as shown in FIG. 2, the one end of the adhesive tape 1 is peeled off in the cavity C of this polymerization cell, the gap is opened, and the nozzle which is not shown in the cavity C from the gap is opened. Put it in. Then, after filling and filling a liquid resin (polymerizable monomer) into the cavity C from the nozzle, the gap is further sealed with the adhesive tape 1. Here, as a resin (polymerizable monomer), a mixture of m-xylylene diisocyanate and pentaerythritol tetrakismercaptopropionate or a mixture of m-xylylene diisocyanate and bis (mercaptoethyl) trithioglycerine Etc. are used, but they are not particularly limited thereto.

(Polymerization process)

Then, the resin in the cavity is heated to polymerize to cure. After the resin (polymerizable monomer) is sufficiently cured by the polymerization step, all of the adhesive tape 1 is peeled off to remove the molds 30 and 30. In this way, a plastic lens molded article is obtained.

Next, the resin (polymerizable monomer) which becomes the raw material of the plastics lens molding and the mold 30 used for the plastic lens molding adhesive tape 1 which concerns on this embodiment, and the shaping | molding method of a plastic lens molded article is demonstrated in detail. do.

(Mold)

In this embodiment, as the mold 30, the disk-shaped glass (silicon dioxide) thing formed so that the surfaces which oppose each other may have desired curvature on both surfaces of a plastic lens is used. In addition, as the mold 30, you may use the thing which consists of a metal thing and other materials besides.

(Suzy)

The resin (polymerizable monomer) that is a raw material of the plastic lens is not particularly limited, but in the case of a lens, a conventionally known material is used. For example, when obtaining a spectacle lens having an ultra high refractive index (refractive index Ne: ≥ 1.65), an episulfide resin (MR-174 manufactured by Mitsui Chemicals Corporation, IU-20 manufactured by Mitsubishi Gas Chemical Co., Ltd.) or a thiourethane resin (Mitsui Chemical) The monomer etc. of MR-7 made by Corporation are used.

In addition, when obtaining a spectacle lens with a high refractive index (1.58 ≤ Ne <1.65), a thiourethane-based resin (MR-6 manufactured by Mitsui Chemical Co., Ltd., MR-8 manufactured by Mitsui Chemical Co., Ltd.), polyester methacrylate (manufactured by Tokuyama Corporation) TS-26), the monomer of polycarbonate (Patilite by Teijin Kasei Co., Ltd.), etc. are used. Moreover, when obtaining the spectacle lens of medium refractive index (1.55 <= Ne <1.58), urethane methacrylate (K-23 Kureha Co., Ltd.), epoxy methacrylate (MCR-50 by Mitsubishi Rayon Co., Ltd.), diallyl carbonate ( Monomers, such as HIRI by PPG Industries Ltd. and diallyl phthalate-type resin (NK-55 by Nichiyu Corp.), are used.

In addition, when obtaining the spectacle lens of low refractive index (Ne: <1.55), urethane resin (TRIVEX by PPG Industries), urethane methacrylate (MCR-10 by Mitsubishi Rayon, Inc.), methacrylate (Kureha Co., Ltd. K) Monomers such as -55), allyl diglycol carbonate (CR-39 manufactured by PPG Industries, Ltd.), diallyl carbonate (CR-607 manufactured by PPG Industries, Inc.), and polymethyl methacrylate (methyl polymethacrylate). .

Next, the silicone adhesive which is a raw material of the base material 2, the adhesive layer 3, and the adhesive which comprise the adhesive tape 1 which concerns on this embodiment is demonstrated.

(Tape mention)

Although the material of the tape base material 2 is not specifically limited, The material which has a polyethylene terephthalate as a main component is optimal. However, as a material of the tape base material 2, it is not limited to polyethylene terephthalate and another material can also be used. As a material of the specific tape base material 2, metal foil, such as stainless steel and soft aluminum, polybutylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, biaxially stretched polypropylene, polyimide, aramid, Resin films, such as a polycycloolefin and a fluororesin, can be used. Moreover, as a base material which made water vapor transmission rate small, the film which laminated | stacked the aluminum foil and the resin film, the film which formed metal oxide thin films, such as alumina and silicon dioxide, on the surface of the resin film, or the composite film which laminated them with the resin film Etc. can also be used.

For example, when polyethylene terephthalate is used as the tape base material 2, it is preferable to make the thickness into the range of 20 micrometers or more and 75 micrometers or less. If it is less than 20 micrometers, since the rigidity of the base material 2 is low, there exists a possibility that the space | interval between two molds 30 and 30 cannot be maintained. Further, the resin (polymerizable monomer) may not be able to resist the expansion force until the end, and cracks, cuts, and the like may occur, and air may enter the cavity (C). On the other hand, when it exceeds 75 micrometers, since the rigidity of the base material 2 is high, there exists a possibility that elasticity may fall. Moreover, a gap may generate | occur | produce in the wrap part of the adhesive tape 1 for plastic lens molding, and there exists a possibility that the leakage of resin (polymerizable monomer) may generate | occur | produce.

(Adhesive layer)

The adhesive layer 3 is comprised from the adhesive which has a peroxide curable silicone adhesive or an addition reaction type silicone adhesive as a main component.

<Peroxide Curing Silicone Adhesive>

Although it does not specifically limit as a peroxide curable silicone adhesive, For example, KR100, KR101-10 by Shin-Etsu Chemical Co., Ltd., YR3340, YR3286, PSA610-SM, XR37-B6722 by Momentive Performance Materials, Inc., Toray Dow Corning Co., Ltd. SH4280 is mentioned.

<Bridge school>

As the peroxide curable silicone pressure sensitive adhesive, an organic peroxide crosslinking agent is used. Although the effective crosslinking agent for this adhesive is not specifically limited, As a kind of organic peroxide, For example, benzoyl peroxide, dicumyl peroxide, 2, 5- dimethyl- 2, 5- di (t-butyl peroxy) hexane And 1,1'-di-t-butylperoxy-3,3,5-trimethylenecyclohexane, 1,3-di- (t-butylperoxy) -diisopropylbenzene, and the like.

<Addition Responsive Silicone Adhesive>

Although it does not specifically limit as addition reaction type silicone adhesive, For example, KR3700, KR3701, X-40-3237-1, X-40-3240, X-40-3291-1, X by Shin-Etsu Chemical Co., Ltd. -40-3229, X-40-3270, X-40-3306, TSR1512, TSR1516, XR37-B9204 made by Momentive Performance Materials, SD4584, SD4585, SD4586, SD4587 made by Toray Dow Corning Corporation , SD4560, SD4570, SD4600PFC, SD4593, DC7651ADHESIVE, and the like.

<Bridge school>

In addition reaction type silicone adhesive, the polyorganohydrogensiloxane containing the hydrosilyl group in the terminal or side chain is used as a crosslinking agent. Although the effective crosslinking agent for this adhesive is not specifically limited, For example, X-92-122 by Shin-Etsu Chemical Co., Ltd. and BY24-741 by Toray Dow Corning Co., Ltd. are mentioned.

<Catalyst>

As the addition-reaction type silicone pressure-sensitive adhesive, a catalyst such as a reaction product of chloroplatinic acid and the vinyl group-containing siloxane is used. Although the effective catalyst for this adhesive is not specifically limited, CAT-PL-50T by Shin-Etsu Chemical Co., Ltd., SRX-212Cat by NC Toray Dow Corning, Inc., NC-25, etc. are mentioned.

<Reaction Control Agent>

In addition reaction type silicone pressure sensitive adhesive, reaction control agents, such as 1, 3- divinyl disiloxane, are used in order to suppress the rapid progress of reaction. Although the effective reaction control agent with respect to this adhesive is not specifically limited, CAT-PLR-2 by Shin-Etsu Chemical Co., Ltd., BY24-808 by Toray Dow Corning, Inc., etc. are mentioned.

<Scratch of lens>

As an aspect of suppressing the occurrence of scratches on the lens, the pressure-sensitive adhesive layer needs to have a state in which the pressure-sensitive adhesive layer can keep track of the outer peripheral surface of the mold at the time of thermal expansion of the polymerizable monomer below the polymerization reaction start temperature. Specifically, it is necessary to set the time until falling in 500 minutes or less in the measurement of the holding force at 70 ° C. according to JIS Z 0237 (ISO 29862). When the fall time of 70 degreeC holding force exceeds 500 minutes, the followability with respect to the thermal expansion of the monomer resin of a lens is bad, and a clearance gap exists in the adhesive surface of the adhesive tape 1 and the mold 30, and the wrap part of the adhesive tape 1 comrades. This is because there is a possibility that leakage of resin occurs, resulting in scratches on the lens.

<Adhesive residue>

As an aspect which suppresses generation | occurrence | production of an adhesive residue, it is necessary for the adhesive layer 3 to provide what this adhesive layer 3 maintains the state which does not leave an adhesive to the mold 30 after polymerization cooling, and specifically, It is preferable that the adhesive force which made the to-be-adhered body which conformed to JIS Z 0237 (ISO 29862) the glass plate is 6.0 N / 10mm or less. When the adhesive force to the glass plate exceeds 6.0N / 10mm, the adhesiveness of the adhesive layer 3 and the mold 30 exceeds the cohesion force of the adhesive layer 3, As a result, the adhesive layer 3 coagulates and breaks, and the mold ( This is because the adhesive may remain in 30).

<Tape off>

As an aspect which suppresses peeling of a tape, it is preferable that the said adhesive layer 3 has the adhesive force which made the to-be-adhered body a glass plate of 2.0N / 10mm or more. When the adhesive force to this glass plate is less than 2.0 N / 10 mm, it cannot follow the thermal stress (expansion and contraction) of the monomer resin of a lens, the tape may peel off from a mold, and the lens may not be formed. to be.

<Thickness change>

As an aspect of suppressing the thickness change, the pressure-sensitive adhesive layer 3 needs to be provided to maintain a state in which the outer circumferential surface of the mold is held on the surface of the pressure-sensitive adhesive layer at the time of curing shrinkage of the polymerizable monomer above the polymerization reaction start temperature. In particular, it is necessary to make the time until it falls in 50 minutes or more in the measurement of the holding force in 70 degreeC according to JISZ0237 (ISO 29862). When the 70 ° C holding force of the pressure-sensitive adhesive layer 3 is less than 50 minutes, the fixing force to the curing shrinkage of the monomer resin of the lens is insufficient, and a deviation occurs in the distance between the molds, so that the thickness of the lens after molding may change. This is because there is concern.

Therefore, in order to suppress the flaw of a lens, adhesive residue, and thickness change, the adhesive layer 3 needs to make the fall time of the holding force in 70 degreeC at least 50-500 minutes, and also with respect to a glass plate It is necessary to make adhesive force 2.0-6.0N / 10mm.

<White flower>

In addition, an adhesive is 165 micrograms / g or less in the total amount of the low molecular siloxane of 3-10 dimers in 1 g of adhesives, by performing high temperature heat processing of 160 degreeC-200 degreeC, for example in the drying and hardening process of an adhesive. It is preferable to make the total amount of the low molecular siloxane of 3-20 monomer into 4850 microgram / g or less. When the total amount of the low molecular siloxane of 3-10 dimer exceeds 165 microgram / g, or when the total amount of the low molecular siloxane of 3-20 dimer exceeds 4850 microgram / g, there exists a possibility that whitening may arise in the outer periphery of a lens. . It is more preferable that the lower molecular siloxane of a 3-10 monomer or a 3-20 monomer is small, and also it is most preferable that the low molecular siloxane of a 3-10 monomer is 0 microgram / g. Although it does not restrict | limit especially about heat processing temperature, It is preferable to heat-process at 160-200 degreeC as a reference. If heat treatment is performed for a long time at a temperature above 200 ° C., the main chain of polyorganosiloxane may be cleaved, and low molecular siloxane may increase. If heat treatment is performed at a temperature lower than 160 ° C., the low molecular weight component is difficult to evaporate because the temperature is too low. Because of this, the remaining amount increases, and as a result, whitening may occur on the outer periphery of the lens. Therefore, it is necessary to appropriately adjust the heat treatment conditions (temperature and time) while being careful.

<Stability>

In order to produce the adhesive with high traceability like the adhesive layer 3, it is necessary to reduce the cohesion force of the adhesive itself. As this method, there is a method of reducing the amount of crosslinking agent or catalyst to be added to the pressure-sensitive adhesive, but in this method, the crosslinking density of the pressure-sensitive adhesive is likely to be affected by the amount of the reactor in the pressure-sensitive adhesive and the atmospheric temperature, thereby stably maintaining the desired holding force. In addition, the addition reaction type silicone pressure sensitive adhesive which is difficult to obtain and has a slow reaction rate exhibits a significant increase in retention force due to date storage, and does not completely solve the problem of poor stability of the pressure sensitive adhesive. In order to improve this stability and to produce a highly followable adhesive like the above-mentioned adhesive layer, for example, a method of reducing the amount of alkenyl groups in the entire silicone pressure-sensitive adhesive, that is, a silicone adhesive containing no alkenyl group is used. A method of reducing the crosslinking density by adding a predetermined amount and reducing the content of silicone resin (MQ resin) having a low molecular weight but three-dimensional crosslinked structure, and loss loss tangent (tanδ) of the dynamic viscoelasticity of the entire silicone pressure-sensitive adhesive (tanδ) The method of shifting to the low temperature side, and reducing a holding force is mentioned, but it is not specifically limited to such a method.

In the method of reducing the amount of alkenyl groups in the whole silicone pressure sensitive adhesive, ie, the method of reducing the crosslinking density by adding a predetermined amount of a silicone pressure sensitive adhesive containing no alkenyl group, the pressure sensitive adhesive layer 3 contains at least an alkenyl group. 50 to 70 parts by weight of a silicone adhesive, 30 to 50 parts by weight of a silicone adhesive containing no alkenyl groups, and a crosslinking agent and a catalyst, wherein the crosslinking agent and the catalyst are blended so as to be 0.5 to 1.5 parts by weight relative to the silicone adhesive containing an alkenyl group. It is preferable to construct.

When the content of the silicone pressure-sensitive adhesive containing no alkenyl group is less than 30 parts by weight, the holding force increases, and the above characteristics cannot be satisfied, and as a result, the lens may be scratched. Moreover, when content of the silicone adhesive which does not contain an alkenyl group exceeds 50 weight part, holding force will fall and it will become impossible to satisfy | fill the said characteristic, and as a result, there exists a possibility that residue of an adhesive and a thickness change of a lens may arise. On the other hand, when the silicone pressure-sensitive adhesive containing alkenyl groups is less than 50 parts by weight, the holding force is lowered, and the above characteristics cannot be satisfied, and as a result, there is a fear that residuals of the pressure-sensitive adhesive or changes in the thickness of the lens may occur. Moreover, when content of the silicone adhesive containing an alkenyl group is 70 weight part or more, holding force will increase and it will not be able to satisfy the said characteristic, and there exists a possibility that a flaw of a lens may arise as a result. Moreover, when the addition amount of a crosslinking agent and a catalyst exceeds 1.5 weight part, unreacted low molecular weight component may melt | dissolve in resin and may cause whitening. In addition, when the addition amount of a crosslinking agent is less than 0.5 weight part, while the holding force changes large with the number of reactors in an adhesive, there exists a possibility that a holding force may change with a date.

In addition, when the content of silicone resin (MQ resin) having a low molecular weight but having a three-dimensional crosslinked structure is reduced, and the loss tangent (tanδ) of the dynamic viscoelasticity of the entire silicone pressure sensitive adhesive is shifted to the low temperature side, the holding force is lowered. In the pressure-sensitive adhesive (a mixture of the silicone pressure-sensitive adhesive containing alkenyl group and the silicone pressure-sensitive adhesive not containing alkenyl group), the composition ratio of polyorganosiloxane gum (G) and silicone resin (R) is 36 to 44 weight. In addition, it is preferable to comprise with the adhesive mix | blended so that silicone resin may be 56-64 weight part.

When the ratio of the silicone resin in this silicone adhesive is less than 56 weight part, holding force and adhesive force will fall, the said characteristic cannot be satisfied, and as a result, there exists a possibility that peeling of a tape and a thickness change of a lens may occur. Moreover, when the ratio of silicone resin exceeds 64 weight part, holding force and adhesive force may increase, and the said characteristic may not be satisfied, and as a result, there exists a possibility that residue of an adhesive and a flaw of a lens may arise. Followability to thermal expansion of the monomer resin of the lens is poor, gaps occur between the adhesive surface of the adhesive tape 1 and the mold 30 or the wrap portion between the adhesive tapes 1, resulting in leakage of resin, and consequently the lens. This is because there is a risk of scratches.

By using the silicone adhesive adjusted in this way, problems, such as a flaw of a lens at the time of lens shaping | molding, a thickness change, an adhesive remainder, etc. are not seen, a change of holding force can be suppressed, and a stable adhesive can be obtained.

3 shows the relationship between the adhesive force of the adhesive tape 1 in the molding step of the plastic lens molded article, the temperature change of the monomer resin of the lens due to the polymerization reaction, and the volume change of the resin.

In FIG. 3, the solid line represents the monomer resin temperature of the lens. This resin temperature is about room temperature before the polymerization reaction, but when the polymerization reaction starts, the temperature of the resin gradually rises by the heat of reaction, and when the polymerization reaction is completed, the reaction heat disappears and the temperature of the resin gradually decreases to room temperature. Although the maximum temperature of resin by this polymerization reaction changes with ambient temperature and the kind of resin, it is usually 120 degreeC-about 130 degreeC in many cases. In addition, although a polymerization reaction start temperature changes with kinds of monomer resin of the lens to be used, in this invention, it is generally below the polymerization reaction start temperature that the temperature range of 40-70 degreeC is more than a polymerization reaction start temperature. Generally, the temperature range of 60-100 degreeC is shown.

In FIG. 3, the dashed-dotted line represents the monomer resin volume of a lens. When the resin volume is based on the time when the resin (polymerizable monomer) is initially in the vicinity of room temperature (about 15 ° C to 25 ° C), the temperature of the resin further increases by heating or light irradiation. From around 40 ° C., the volume gradually increases (thermal expansion). And when the temperature exceeds 60-70 degreeC, the volume of resin will begin to become smaller than the volume of an initial reference | standard (curing shrinkage). Thereafter, the volume is lowest when the polymerization reaction is completed and the resin becomes a polymer. Moreover, although the volume shrinkage rate of resin by this polymerization reaction also changes with kinds of resin etc., it is generally made into about 80 to 98% of the volume of a monomer state.

In FIG. 3, the broken line has shown the adhesive force. Although the adhesive tape 1 which concerns on this embodiment exhibits the highest adhesive force and cohesion force near room temperature (about 15 degreeC-25 degreeC), it has the characteristic that the cohesion force gradually falls with temperature rising.

The monomer resin of the lens filled in the cavity (C) causes thermal expansion (generally from 40 ° C to 70 ° C) by heating or heat of reaction, and the volume increases from the volume of the initial reference. Then, when it becomes a polymerization temperature range (generally 60 degreeC-100 degreeC), a polymerization reaction advances and shrinks rather than the volume of an initial reference | standard. In a conventional adhesive tape having a high cohesive force, the followability to thermal expansion is poor, and a gap is generated between the adhesive surface of the adhesive tape 1 and the mold 30 or the wrap portion between the adhesive tapes 1, and the resin is leaked, resulting in This will scratch the lens. On the other hand, in the conventional adhesive tape having a low cohesive force, as shown in FIG. 4, since the fixing force to the molds 30 and 30 of the adhesive tape 100 decreases, the molds 30 and 30 are formed by the shrinkage force of the resin. Resistant to the cohesive force of the pressure-sensitive adhesive layer, the surface of the pressure-sensitive adhesive layer moves and moves closer to each other, resulting in a change in thickness.

However, in the adhesive tape 1 which concerns on this embodiment, since the holding force in 70 degreeC is 50 to 500 minutes, in the temperature range of 40 degreeC-70 degreeC which thermal expansion of the monomer resin of a lens produces, a tape The gap between the adhesive surface of the mold and the wrap portion of the tape is not seen, and the occurrence of leakage can be suppressed, and the occurrence of scratches on the lens can be prevented. Moreover, even in the temperature range of 60 degreeC-100 degreeC which hardening shrinkage of resin generate | occur | produces, the cohesion force sufficient to fix the molds 30 and 30 is obtained, and the molds 30 and 30 follow the surface of the adhesive layer 3 Stop without. For this reason, by using the adhesive tape 1 of this embodiment, the thickness and curvature which are the basic performance of a molded article can be prevented from changing.

When the holding force at 70 ° C. according to JIS Z 0237 (ISO 29862) of the adhesive tape 1 of the present embodiment is less than 50 minutes, a sufficient fixing force against curing shrinkage of the monomer resin of the lens cannot be obtained, and the mold 30 And 30 follow the surface of the pressure-sensitive adhesive layer 3, and there is a possibility that the thickness of the lens after molding may change because a deviation occurs in the distance between the molds. On the other hand, when 70 degreeC holding force of the adhesive tape 1 of this embodiment exceeds 500 minutes, the followability with respect to the thermal expansion of a lens monomer is bad, and the adhesive surface or adhesive tape of the adhesive tape 1 and the mold 30 is bad. (1) There exists a possibility that a gap may arise in the lap | tip part of mutual, and the leakage of resin may generate | occur | produce, and as a result, a flaw may arise in a lens. As for the holding force of 70 degreeC, 80 minutes or more and 300 minutes or less are more preferable.

When the adhesive force with respect to glass of the adhesive tape 1 of this embodiment becomes 2.0 N / 10 mm or less, adhesiveness of an adhesive tape and a mold falls, it cannot follow the thermal response of a lens monomer, and a tape is peeled off I might throw it away. On the other hand, when the adhesive force with respect to the glass of the adhesive tape 1 of this embodiment exceeds 6.0 N / 10mm, adhesiveness of an adhesive tape and a mold increases, and when an adhesive tape is peeled off, an adhesive residue may arise in a mold. There is.

(Example)

Hereinafter, the Example and comparative example of the adhesive tape for plastic lens molding which concerns on this invention are shown. However, the adhesive tape for plastic lens molding of this invention is not limited to this.

As an index of the cohesion force and elastic modulus of the pressure-sensitive adhesive according to the present invention, storage modulus, loss tangent tan δ, shear force, and retention force are generally mentioned, but are not particularly limited. The storage modulus and loss tangent tan δ are measured and evaluated while continuously changing the temperature under conditions of a predetermined frequency using a dynamic viscoelasticity measuring device. Shear force is, for example, the adhesive layer surface of the adhesive tape having a width of 25 mm and a length of 50 mm is applied to two sheets of stainless steel sheets so as to be 25 mm x 25 mm, pressed by 19.6 N rollers and pressed for 5 round trips, and left for a predetermined time under each temperature condition. In accordance with JIS Z 0237, a tensile tester is used to fix and evaluate one of the stainless steel sheets by fixing one and pulling the other at a predetermined speed. In accordance with JIS Z 0237 (ISO 29863), a 25 mm wide and 25 mm long adhesive tape is affixed to a 50 mm x 100 mm stainless steel sheet, and a 19.6 N roller is pressed one time round to apply a load of 9.8 N. The shift amount or fall time after leaving for 24 hours is measured and evaluated.

In addition, although it evaluated by adhesive force as an index of the residual of an adhesive in the mold, it is not specifically limited. In accordance with JIS Z 0237 (ISO 29862), this adhesive force is affixed with an adhesive tape having a width of 25 mm and a length of 125 mm to a glass plate, which is an adherend, followed by pressing the 19.6N roller two times at a speed of 10 ± 0.5 mm / s. It removes in 180 degree direction by a tension tester within 1 minute, and measures and evaluates the adhesive force with the to-be-adhered body at that time.

In addition, low molecular weight siloxane quantification of the adhesive tape for plastic lens molding was performed under [1] pretreatment conditions and [2] analysis conditions. The conditions of [1] are shown below. 0.25 g of the chopped sample was immersed in 10 mL of acetone (containing 20 µg / mL of n-tetradecane as an internal standard), and left to stand at room temperature for 24 hours after being sealed. Using the obtained immersion liquid as a test liquid, gas chromatograph analysis was performed. The relative sensitivity with n-tetradecane was 2.62.

The analysis conditions of the gas chromatograph (GC / FID) with hydrogen flame ionization detector of [2] are shown below. Apparatus: 7890A made by Agilent Technologies, column: DB-5 made by J & W (length 30 m, inner diameter 0.25 mm, film thickness 0.25 μm), column temperature: 50 ° C. (5 minutes)-(10 ° C./minute)→300° C. (60 minutes ), Injection port temperature: 300 ° C, detector temperature: 300 ° C, carrier gas: He, injection method: pulsed splitless, injection amount: 1 μL, detector: hydrogen flame ionization detector (FID).

In the polyorganosiloxane gum (G) of the adhesive used for a present Example or a comparative example, the polyorganosiloxane gum which contains an alkenyl group in the side chain and terminal of which a polymerization average molecular weight is about 500,000, and does not contain an alkenyl group is included. Siloxane gum was used. As the silicone resin (R), an MQ resin having a polymerization average molecular weight of about 5000 and consisting of monofunctional (M units) and tetrafunctional (Q units) siloxane units was used. The adhesive of (A)-(D) which changed the compounding ratio of such polyorganosiloxane gum and MQ resin was used.

(A) Adhesive A: Polyorganosiloxane gum containing alkenyl group G / R = 30/70

(B) Adhesive B: Polyorganosiloxane gum containing alkenyl group G / R = 70/30

(C) Adhesive C: Polyorganosiloxane gum containing no alkenyl group G / R = 30/70

(D) Adhesive D: Polyorganosiloxane gum containing no alkenyl group G / R = 70/30

The following Table 1 has shown the compounding example of the adhesive and crosslinking agent in each Example and each comparative example. Table 2 below shows the heat treatment temperature, the adhesion to the glass, the holding force, the amount of low molecular siloxane and the test results in each Example and Comparative Example. Table 3 below shows the results of the tape peeling on the initial tape and the tape after 3 months elapsed, the presence of mold adhesive residue, the presence of lens scratches, the presence of a thickness change, and the presence of whitening.

TABLE 1

TABLE 2

TABLE 3

(Example 1)

A toluene solution containing 60 parts by weight of pressure-sensitive adhesive A, 15 parts by weight of pressure-sensitive adhesive C and 25 parts by weight of pressure-sensitive adhesive D was prepared, and 0.60 parts by weight of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Corporation) effective for the pressure-sensitive adhesive. 1.00 weight part with respect to a nil group containing adhesive and 0.50 weight part of catalysts (NC-25 by Toray Dow Corning Co., Ltd.) were stirred and mixed uniformly in toluene, and it added and stirred to the said toluene solution, and produced the adhesive solution. The pressure-sensitive adhesive solution was coated on a polyester (PET) film base material (thickness 50 µm) manufactured by Toray Industries, Inc. so that the pressure-sensitive adhesive layer had a thickness of 20 µm, and dried and cured at a maximum temperature of heat treatment (drying) at 180 ° C. An adhesive tape for molding a plastic lens having a thickness of 70 μm (hereinafter sometimes referred to as an adhesive tape) was obtained.

As shown in Table 1, this adhesive is 40 weight part of polyorganosiloxane gums (G), 60 weight part of silicone resins (R), and 60 weight part of silicone adhesives containing an alkenyl group contain an alkenyl group The silicone adhesive which does not consist of 40 weight part. As shown in Table 2, as for the adhesive tape 1 using this adhesive, the adhesive force with respect to a glass plate falls at 4.5N / 10mm, 70 degreeC holding force in 172 minutes, and the total amount of the low molecular siloxane of 3-10 dimers is 64 micrograms. / g, and the total amount of the low molecular siloxane of 3-20 monomer was 2600 microgram / g.

As shown in Table 3, the plastic lens produced using this adhesive tape 1 was a good-quality lens without peeling off a tape, residual adhesive in a mold, scratches of a lens, thickness change, and whitening. Therefore, it can be said that this adhesive tape 1 has the characteristic required for lens shaping | molding. Moreover, even after the adhesive tape 1 obtained in Example 1 was preserve | saved for 3 months at 40 degreeC, 70 degreeC holding force falls in 185 minutes, and the change with an initial value is hardly seen, and the plastic lens was molded similarly. Bars and lenses having no need for polishing of the lens periphery and cutting of the lens surface were obtained. Therefore, it can be said that this adhesive tape has the characteristic required for lens shaping even after long term storage.

In addition, the meaning of the evaluation item of a plastic lens is as follows.

<Tape off>

Tape peeling means that the adhesive force of an adhesive tape and a mold is low, a tape peels from a mold by the thermal stress of resin, and a lens cannot be shape | molded.

<Scratch of lens>

The scratch of a lens means that resin before hardening leaks out of a cavity during lens shaping.

<Thickness change>

The thickness change means that a thickness thinner than the plastic lens to be originally obtained is obtained by shrinkage in the thickness direction of the resin accompanying the polymerization reaction.

<Residual residue in mold>

When the adhesive remains in the mold, the adhesive on the tape cohesively breaks when the lens is removed, and the adhesive remains on the mold.

<White flower>

With whitening, the low molecular siloxane in an adhesive elutes in resin, and whitening arises in the outer periphery of a lens.

(Example 2)

A toluene solution containing 60 parts by weight of pressure-sensitive adhesive A, 15 parts by weight of pressure-sensitive adhesive C, and 25 parts by weight of pressure-sensitive adhesive D was prepared, and 0.3 parts by weight of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Corporation) effective for the pressure-sensitive adhesive. 0.50 parts by weight of the Niel group-containing pressure sensitive adhesive and 0.50 parts by weight of the catalyst (NC-25, manufactured by Toray Dow Corning Co., Ltd.) were uniformly stirred and mixed in toluene, and added and stirred to the toluene solution to prepare an adhesive solution. Using this pressure-sensitive adhesive solution, a pressure-sensitive adhesive tape was produced in the same manner as in Example 1.

As shown in Table 2, as for the adhesive tape 1 using this adhesive, the adhesive force with respect to a glass plate falls in 5.0 N / 10mm, 70 degreeC holding force in 132 minutes, and the total amount of the low molecular siloxane of 3-10 monomers is 120 micrograms. / g, and the total amount of the low molecular siloxane of 3-20 monomer was 3521 µg / g.

As shown in Table 3, the plastic lens produced using this adhesive tape 1 did not peel off the tape, the adhesive residue in the mold, the scratch of the lens, the thickness change, and the whitening did not occur, and it was a good lens. Therefore, it can be said that this adhesive tape has the characteristic required for lens shaping.

Moreover, even after the adhesive tape 1 obtained in Example 2 was preserve | saved at 40 degreeC for 3 months, 70 degreeC holding force falls in 162 minutes, and the change with an initial value is hardly seen, and the plastic lens was molded similarly. Bars and lenses having no need for polishing of the lens periphery and cutting of the lens surface were obtained. Therefore, it can be said that this adhesive tape 1 has the characteristic required for lens shaping | molding even after long term storage.

(Example 3)

Toluene solution containing 60 parts by weight of pressure-sensitive adhesive A, 15 parts by weight of pressure-sensitive adhesive C and 25 parts by weight of pressure-sensitive adhesive D was prepared, and 0.9 parts by weight of a crosslinking agent (Toray Dow Corning Co., Ltd. BY24-741) effective for the pressure-sensitive adhesive. 1.5 weight part with respect to a nil group containing adhesive, 0.50 weight part of catalysts (NC-25 by Toray Dow Corning Co., Ltd.) was stirred uniformly in toluene, and it stirred and added to the said toluene solution, and produced the adhesive solution. Using this pressure-sensitive adhesive solution, a pressure-sensitive adhesive tape was produced in the same manner as in Example 1.

As shown in Table 2, as for the adhesive tape 1 using this adhesive, the adhesive force with respect to a glass plate falls at 4.0N / 10mm, 70 degreeC holding force in 247 minutes, and the total amount of the low molecular siloxane of 3-10 monomers is 55 micrograms. / g, and the total amount of low molecular siloxane of 3 to 20 monomers was 2722 µg / g.

As shown in Table 3, the plastic lens produced using this adhesive tape 1 was a good-quality lens without peeling off a tape, residual adhesive in a mold, scratches of a lens, thickness change, and whitening. Therefore, it can be said that this adhesive tape has the characteristic required for lens shaping. In addition, even after the adhesive tape 1 obtained in Example 3 was preserve | saved at 40 degreeC for 3 months, 70 degreeC holding force falls in 229 minutes, and the change with an initial value is hardly seen, and the plastic lens was molded similarly. Bars and lenses having no need for polishing of the lens periphery and cutting of the lens surface were obtained. Therefore, it can be said that this adhesive tape has the characteristic required for lens shaping even after long term storage.

(Example 4)

A toluene solution was prepared in which 50 parts by weight of pressure-sensitive adhesive A, 20 parts by weight of pressure-sensitive adhesive B, 15 parts by weight of pressure-sensitive adhesive C and 15 parts by weight of pressure-sensitive adhesive D were prepared, and a crosslinking agent effective by the pressure-sensitive adhesive (by Toray Dow Corning Corporation BY24- 741) 0.8 parts by weight (1.1 parts by weight of the alkenyl group-containing pressure-sensitive adhesive) and 0.50 parts by weight of catalyst (NC-25, manufactured by Toray Dow Corning Co., Ltd.) were uniformly stirred and mixed in toluene, and added and stirred to the toluene solution to prepare the pressure-sensitive adhesive solution. Produced. Using this pressure-sensitive adhesive solution, a pressure-sensitive adhesive tape was produced in the same manner as in Example 1.

As shown in Table 1, this pressure-sensitive adhesive was 44 parts by weight of polyorganosiloxane gum and 56 parts by weight of silicone resin, 70 parts by weight of the silicone pressure-sensitive adhesive containing alkenyl group, and 30 parts of the silicone pressure-sensitive adhesive containing no alkenyl group. It is composed of parts by weight. As shown in Table 2, as for the adhesive tape 1 using this adhesive, the adhesive force with respect to a glass plate is 3.5N / 10mm, 70 degreeC holding force falls to 378 (according to the value of Table 2), and it is a 3-10 monomer The total amount of low molecular siloxane of was 55 microgram / g, and the total amount of low molecular siloxane of 3-20 monomer was 3211 microgram / g.

As shown in Table 3, the plastic lens produced using this adhesive tape 1 was a good-quality lens without peeling off a tape, residual adhesive in a mold, scratches of a lens, thickness change, and whitening. Therefore, it can be said that this adhesive tape has the characteristic required for lens shaping. Moreover, even after the adhesive tape 1 obtained in Example 4 was preserve | saved at 40 degreeC for 3 months, 70 degreeC holding force falls to 355 (according to the value of Table 2), and the change with an initial value is hardly seen. When the plastic lens was molded in the same manner, a good lens obtained without polishing of the lens peripheral part and cutting of the lens surface was obtained. Therefore, it can be said that this adhesive tape has the characteristic required for lens shaping even after long term storage.

(Example 5)

Toluene solution containing 50 parts by weight of pressure-sensitive adhesive A, 35 parts by weight of pressure-sensitive adhesive C, and 15 parts by weight of pressure-sensitive adhesive D was prepared, and 0.4 parts by weight of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Corporation) effective for the pressure-sensitive adhesive. 0.80 weight part with respect to a nil group containing adhesive and 0.50 weight part of catalysts (NC-25 by Toray Dow Corning Co., Ltd.) were stirred uniformly in toluene, and it added and stirred to the said toluene solution, and produced the adhesive solution. Using this pressure-sensitive adhesive solution, a pressure-sensitive adhesive tape was produced in the same manner as in Example 1.

As shown in Table 1, the pressure-sensitive adhesive was 36 parts by weight of polyorganosiloxane gum and 64 parts by weight of silicone resin, 50 parts by weight of the silicone adhesive containing alkenyl group, and 50 parts of the silicone adhesive containing no alkenyl group. It is composed of parts by weight. As shown in Table 2, as for the adhesive tape 1 using this adhesive, the adhesive force with respect to a glass plate is 6.0 N / 10mm, 70 degreeC holding force falls in 122 minutes, and the total amount of the low molecular siloxane of 3-10 monomers is 47 micrograms. / g, and the total amount of the low molecular siloxane of 3-20 monomer was 2824 microgram / g.

As shown in Table 3, the plastic lens produced using this adhesive tape 1 was a good-quality lens without peeling off a tape, residual adhesive in a mold, scratches of a lens, thickness change, and whitening. Therefore, it can be said that this adhesive tape has the characteristic required for lens shaping.

In addition, even after the adhesive tape 1 obtained in Example 5 was preserve | saved for 3 months at 40 degreeC, 70 degreeC holding force falls in 138 minutes, and the change with an initial value is hardly seen, and the plastic lens was molded similarly. Bars and lenses having no need for polishing of the lens periphery and cutting of the lens surface were obtained. Therefore, it can be said that this adhesive tape has the characteristic required for lens shaping even after long term storage.

(Example 6)

As shown in Table 1, the adhesive in Example 6 prepares the toluene solution which mix | blended 50 weight part of adhesive A, 15 weight part of adhesive C, and 35 weight part of adhesive D. 0.4 weight part (0.8 weight part with respect to alkenyl-group containing adhesive) is mix | blended with a crosslinking agent (BY24-741 by Toray Dow Corning Co., Ltd.) and a catalyst (NC-25 by Toray Dow Corning Co., Ltd.) with respect to 100 weight part of adhesives. have. As shown in Table 1, this adhesive is 44 weight part of polyorganosiloxane gums, 56 weight part of silicone resins, 50 weight part of silicone adhesives containing an alkenyl group, and 50 weight part of silicone adhesives containing no alkenyl group It is composed of parts by weight.

As shown in Table 2, as for the adhesive tape 1 using this adhesive, the adhesive force with respect to a glass plate falls at 3.5 N / 10mm, 70 degreeC holding force in 51 minutes, and the total amount of the low molecular siloxane of 3-10 monomers is 96 micrograms. / g, and the total amount of low molecular siloxane of 3 to 20 monomers was 4110 µg / g. As shown in Table 3, the plastic lens produced using this adhesive tape 1 was a good-quality lens without peeling off a tape, residual adhesive in a mold, scratches of a lens, thickness change, and whitening. Therefore, it can be said that this adhesive tape has the characteristic required for lens shaping.

In addition, even after the adhesive tape 1 obtained in Example 6 was preserve | saved for 3 months at 40 degreeC, 70 degreeC holding force fell in 53 minutes, and the change with an initial value was hardly seen, and the plastic lens was molded similarly. Bars and lenses having no need for polishing of the lens periphery and cutting of the lens surface were obtained. Therefore, it can be said that this adhesive tape has the characteristic required for lens shaping even after long term storage.

(Example 7)

As shown in Table 1, the adhesive in Example 7 prepares the toluene solution which mix | blended 55 weight part of adhesive A, 15 weight part of adhesive B, and 30 weight part of adhesive C. The crosslinking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) and the catalyst (NC-25 manufactured by Toray Dow Corning Co., Ltd.) are blended with 0.8 part by weight (1.1 parts by weight based on the alkenyl group-containing pressure sensitive adhesive) based on 100 parts by weight of the pressure-sensitive adhesive. have. As shown in Table 1, the pressure-sensitive adhesive was 36 parts by weight of polyorganosiloxane gum and 64 parts by weight of silicone resin, 70 parts by weight of the silicone adhesive containing alkenyl group, and 30 parts of the silicone adhesive containing no alkenyl group. It is composed of parts by weight. As shown in Table 2, as for the adhesive tape 1 using this adhesive, the adhesive force with respect to a glass plate falls in 4.0N / 10mm, 70 degreeC holding force in 472 minutes, and the total amount of the low molecular siloxane of 3-10 dimers is 80 micrograms. / g, and the total amount of the low molecular siloxane of 3-20 monomer was 3850 µg / g. As shown in Table 3, the plastic lens produced using this adhesive tape 1 was a good-quality lens without peeling off a tape, residual adhesive in a mold, scratches of a lens, thickness change, and whitening. Therefore, it can be said that this adhesive tape has the characteristic required for lens shaping.

In addition, even after the adhesive tape 1 obtained in Example 7 was preserve | saved at 40 degreeC for 3 months, 70 degreeC holding force fell in 487 minutes, and the change with an initial value was hardly seen, and the plastic lens was molded similarly. Bars and lenses having no need for polishing of the lens periphery and cutting of the lens surface were obtained. Therefore, it can be said that this adhesive tape has the characteristic required for lens shaping even after long term storage.

(Example 8)

Using the same adhesive as Example 1, the adhesive tape was created like Example 1 except having set the maximum temperature of heat processing (drying) to 190 degreeC. As shown in Table 2, as for the adhesive tape 1 using this adhesive, the adhesive force with respect to a glass plate is 6.0 N / 10mm, 70 degreeC holding force falls in 125 minutes, and the total amount of the low molecular siloxane of 3-10 monomers is 0 microgram. / g, and the total amount of low molecular siloxane of 3 to 20 monomers was 1980 µg / g. As shown in Table 3, the plastic lens produced using this adhesive tape 1 was a good-quality lens without peeling off a tape, residual adhesive in a mold, scratches of a lens, thickness change, and whitening. Therefore, it can be said that this adhesive tape has the characteristic required for lens shaping. Furthermore, even after the adhesive tape 1 obtained in Example 8 was preserve | saved at 40 degreeC for 3 months, 70 degreeC holding force falls in 140 minutes, and the change with an initial value is hardly seen, and the plastic lens was molded similarly. Bars and lenses having no need for polishing of the lens periphery and cutting of the lens surface were obtained. Therefore, it can be said that this adhesive tape has the characteristic required for lens shaping even after long term storage.

(Example 9)

Toluene solution containing 60 parts by weight of pressure-sensitive adhesive A, 15 parts by weight of pressure-sensitive adhesive C and 25 parts by weight of pressure-sensitive adhesive D was prepared, and 0.6 parts by weight of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) effective for the pressure-sensitive adhesive. 1.00 weight part with respect to a nil group containing adhesive and 0.60 weight part of catalysts (NC-25 by Toray Dow Corning Co., Ltd.) were stirred and mixed uniformly in toluene, and it added and stirred to the said toluene solution, and produced the adhesive solution. Using this pressure-sensitive adhesive solution, an adhesive tape was produced in the same manner as in Example 1 with a heat treatment temperature of 130 ° C. As shown in Table 1, the pressure-sensitive adhesive was 40 parts by weight of polyorganosiloxane gum, 60 parts by weight of silicone resin, 60 parts by weight of silicone pressure-sensitive adhesive containing alkenyl group, and silicone pressure-sensitive adhesive containing no alkenyl group. 40 parts by weight.

As shown in Table 2, as for the adhesive tape using this adhesive, adhesive force falls in 5.0N / 10mm, 70 degreeC holding force in 175 minutes, and the total amount of the low molecular siloxane of 3-10 monomers is 182 microgram / g, and 3 The total amount of low molecular siloxane of ˜20-mer was 6502 µg / g. As shown in Table 3, the plastic lens produced using this adhesive tape had no peeling off of the tape, residual adhesive on the mold, scratches on the lens, and no change in thickness on the lens. It looks like In addition, even after the adhesive tape obtained in Example 9 was preserve | saved for 3 months at 40 degreeC, the holding force of 70 degreeC falls in 192 minutes, the change with an initial value is hardly seen, and it whitens to a lens at the level which is satisfactory practically. Has appeared.

(Example 10)

Toluene solution containing 60 parts by weight of pressure-sensitive adhesive A, 15 parts by weight of pressure-sensitive adhesive C and 25 parts by weight of pressure-sensitive adhesive D was prepared, and 0.6 parts by weight of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) effective for the pressure-sensitive adhesive. 1.00 weight part with respect to a nil group containing adhesive and 0.50 weight part of catalysts (NC-25 by Toray Dow Corning Co., Ltd.) were uniformly stirred and mixed in toluene, and it added and stirred to the said toluene solution, and produced the adhesive solution. Using this pressure-sensitive adhesive solution, an adhesive tape was produced in the same manner as in Example 1 with a heat treatment temperature of 210 ° C. As shown in Table 1, the pressure-sensitive adhesive was 40 parts by weight of polyorganosiloxane gum, 60 parts by weight of silicone resin, 60 parts by weight of silicone pressure-sensitive adhesive containing alkenyl group, and silicone pressure-sensitive adhesive containing no alkenyl group. 40 parts by weight.

As shown in Table 2, the pressure-sensitive adhesive tape using this pressure-sensitive adhesive was 5.0 N / 10 mm, 70 ° C. holding force dropped at 186 minutes, and the total amount of the low molecular siloxane of 3 to 10 monomers was 196 μg / g, and 3 The total amount of low molecular siloxane of ˜20-mers was 8096 μg / g. As shown in Table 3, the plastic lens produced using this adhesive tape did not cause tape peeling, mold adhesive residue, lens scratches, and lens thickness change, but had whitening of the lens at a level that was practically not a problem. Moreover, even after the adhesive tape obtained in Example 10 was preserve | saved for 3 months at 40 degreeC, the holding force of 70 degreeC falls in 170 minutes, the change with an initial value is hardly seen, and the whitening of a lens is at the level which is satisfactory practically. Has appeared.

(Comparative Example 1)

A toluene solution containing 75 parts by weight of pressure-sensitive adhesive A and 25 parts by weight of pressure-sensitive adhesive B was prepared, and 0.2 parts by weight of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) effective for the pressure-sensitive adhesive (0.2 weight based on the alkenyl group-containing pressure-sensitive adhesive) Parts) and 0.50 parts by weight of a catalyst (NC-25, manufactured by Toray Dow Corning Co., Ltd.) were uniformly stirred and mixed in toluene, and added and stirred to the toluene solution to prepare an adhesive solution. Using this pressure-sensitive adhesive solution, a pressure-sensitive adhesive tape was produced in the same manner as in Example 1. As shown in Table 1, this adhesive consists of 40 weight part of polyorganosiloxane gums, 60 weight part of silicone resins, and 100 weight part of silicone adhesives containing an alkenyl group.

As shown in Table 2, as for the adhesive tape 1 using this adhesive, the adhesive force with respect to a glass plate falls in 5.5N / 10mm, 70 degreeC holding force in 96 minutes, and the total amount of the low molecular siloxane of 3-10 monomers is 60 micrograms. / g, and the total amount of the low molecular siloxane of 3-20 monomer was 3864 µg / g. As shown in Table 3, the plastic lens produced using this adhesive tape 1 does not have tape peeling, adhesive residue in a mold, thickness change, and whitening. However, after storing the adhesive tape obtained by the comparative example 1 for 3 months at 40 degreeC, 70 degreeC holding force fell in 1056 minutes, and the holding force increased significantly. When the plastic lens was similarly molded using this adhesive tape, part of the lens was scratched and a good lens could not be obtained.

(Comparative Example 2)

A toluene solution containing 80 parts by weight of pressure-sensitive adhesive A, 5 parts by weight of pressure-sensitive adhesive C and 15 parts by weight of pressure-sensitive adhesive D was prepared, and 0.9 parts by weight of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Corporation) effective for the pressure-sensitive adhesive. 1.1 weight part with respect to a nil group containing adhesive, 0.50 weight part of catalysts (NC-25 by Toray Dow Corning Co., Ltd.) was stirred uniformly in toluene, and it added and stirred to the said toluene solution, and produced the adhesive solution. Using this pressure-sensitive adhesive solution, a pressure-sensitive adhesive tape was produced in the same manner as in Example 1.

As shown in Table 1, this pressure-sensitive adhesive was 36 parts by weight of polyorganosiloxane gum, 64 parts by weight of silicone resin, 80 parts by weight of a silicone adhesive containing alkenyl group, and 20 parts of a silicone adhesive containing no alkenyl group. It is composed of parts by weight. As shown in Table 2, as for the adhesive tape 1 using this adhesive, the adhesive force with respect to a glass plate falls in 5.0N / 10mm, 70 degreeC holding force in 1021 minutes, and the total amount of the low molecular siloxane of 3-10 monomers is 66 micrograms. / g, and the total amount of the low molecular siloxane of 3-20 monomer was 2901 microgram / g. As shown in Table 3, the plastic lens produced using this adhesive tape did not have tape peeling, thickness change, adhesive residue in the mold, and whitening, but a part of the lens was scratched. Moreover, even after storing the adhesive tape obtained by the comparative example 2 for 3 months at 40 degreeC, 70 degreeC holding force falls in 1151 minutes, and 70 degreeC holding force after the preservation for 3 months at initial holding force and 40 degreeC is large, and a part of a lens Scratches occurred, and as a result, a good lens could not be obtained.

(Comparative Example 3)

Toluene solution containing 40 parts by weight of pressure-sensitive adhesive A, 25 parts by weight of pressure-sensitive adhesive C, and 35 parts by weight of pressure-sensitive adhesive D was prepared, and 0.3 parts by weight of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Corporation) effective for the pressure-sensitive adhesive. 0.80 weight part with respect to a nil group containing adhesive and 0.50 weight part of catalysts (NC-25 by Toray Dow Corning Co., Ltd.) were stirred uniformly in toluene, and it added and stirred to the said toluene solution, and produced the adhesive solution. Using this pressure-sensitive adhesive solution, a pressure-sensitive adhesive tape was produced in the same manner as in Example 1.

As shown in Table 1, this adhesive is 44 weight part of polyorganosiloxane gums, 56 weight part of silicone resins, 40 weight part of silicone adhesives containing an alkenyl group, and 60 weight part of silicone adhesives containing no alkenyl groups It is composed of parts by weight. As shown in Table 2, as for the adhesive tape using this adhesive, the adhesive force with respect to a glass plate falls at 4.5N / 10mm, 70 degreeC holding force in 41 minutes, and the total amount of the low molecular siloxane of 3-10 monomers is 98 microgram / g. , The total amount of the low molecular siloxane of 3-20 monomer was 4215 microgram / g.

As shown in Table 3, the plastic lens produced using this adhesive tape did not have tape peeling, residual adhesive on the mold, scratches and whitening of the lens, but a change in the thickness of the lens occurred, resulting in obtaining a good lens. Could not. Moreover, even after the adhesive tape obtained by the comparative example 3 was preserve | saved for 3 months at 40 degreeC, 70 degreeC holding force falls in 36 minutes, and both the initial holding force and the 70 degreeC holding force after storing for 3 months at 40 degreeC are small, and the thickness change of a lens Occurred, and as a result, a good quality lens could not be obtained.

(Comparative Example 4)

A toluene solution containing 70 parts by weight of pressure-sensitive adhesive A, 20 parts by weight of pressure-sensitive adhesive C and 10 parts by weight of pressure-sensitive adhesive D was prepared, and 0.7 parts by weight of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) effective for the pressure-sensitive adhesive. 1.00 weight part with respect to a nil group containing adhesive and 0.50 weight part of catalysts (NC-25 by Toray Dow Corning Co., Ltd.) were uniformly stirred and mixed in toluene, and it added and stirred to the said toluene solution, and produced the adhesive solution. Using this pressure-sensitive adhesive solution, a pressure-sensitive adhesive tape was produced in the same manner as in Example 1.

As shown in Table 1, the pressure-sensitive adhesive was 34 parts by weight of polyorganosiloxane gum and 66 parts by weight of silicone resin, 70 parts by weight of the silicone pressure-sensitive adhesive containing alkenyl group, and 30 parts of the silicone pressure-sensitive adhesive containing no alkenyl group. It is composed of parts by weight.

As shown in Table 2, as for the adhesive tape using this adhesive, the adhesive force with respect to a glass plate falls in 6.0 N / 10mm, 70 degreeC holding force in 562 minutes, and the total amount of the low molecular siloxane of 3-10 monomers is 126 micrograms / g, The total amount of low molecular siloxane of 3 to 20 monomers was 4088 µg / g. As shown in Table 3, the plastic lens produced using this adhesive tape did not peel off the tape, retain the pressure-sensitive adhesive in the mold, change the thickness of the lens, or whiten the lens. However, part of the lens was scratched. Couldn't get it. In addition, even after the adhesive tape obtained by the comparative example 4 was preserve | saved for 3 months at 40 degreeC, 70 degreeC holding force falls in 589 minutes, the change with an initial value is hardly seen, and a part of the lenses has a scratch, and as a result, A good lens could not be obtained.

(Comparative Example 5)

Toluene solution containing 50 parts by weight of pressure-sensitive adhesive A, 10 parts by weight of pressure-sensitive adhesive C and 40 parts by weight of pressure-sensitive adhesive D was prepared, and 0.5 parts by weight of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Corporation) effective for the pressure-sensitive adhesive. 1.00 weight part with respect to a nil group containing adhesive and 0.50 weight part of catalysts (NC-25 by Toray Dow Corning Co., Ltd.) were uniformly stirred and mixed in toluene, and it added and stirred to the said toluene solution, and produced the adhesive solution. Using this pressure-sensitive adhesive solution, a pressure-sensitive adhesive tape was produced in the same manner as in Example 1.

As shown in Table 1, the pressure-sensitive adhesive was 46 parts by weight of polyorganosiloxane gum and 54 parts by weight of silicone resin, 50 parts by weight of the silicone adhesive containing alkenyl group, and 50 parts of the silicone adhesive containing no alkenyl group. It is composed of parts by weight. As shown in Table 2, as for the adhesive tape using this adhesive, adhesive force falls to 3.5N / 10mm, 70 degreeC holding force in 42 minutes, and the total amount of the low molecular siloxane of 3-10 monomers is 40 microgram / g, and 3 The total amount of low molecular siloxane of ˜20-mer was 3112 μg / g.

As shown in Table 3, the plastic lens produced using this adhesive tape did not have tape peeling to the glass plate, residual adhesive on the mold, scratches and whitening of the lens, but a thickness change occurred in the lens. Couldn't get it. Moreover, even after the adhesive tape obtained by the comparative example 5 was preserve | saved for 3 months at 40 degreeC, 70 degreeC holding force falls in 46 minutes, the change with an initial value is hardly seen, and a thickness change arises in a lens, and consequently a good article Could not get the lens.

(Comparative Example 6)

A toluene solution containing 80 parts by weight of pressure-sensitive adhesive A, 10 parts by weight of pressure-sensitive adhesive C and 10 parts by weight of pressure-sensitive adhesive D was prepared, and 0.9 parts by weight of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) effective for the pressure-sensitive adhesive. 1.1 weight part with respect to a nil group containing adhesive, 0.50 weight part of catalysts (NC-25 by Toray Dow Corning Co., Ltd.) was stirred uniformly in toluene, and it added and stirred to the said toluene solution, and produced the adhesive solution. Using this pressure-sensitive adhesive solution, a pressure-sensitive adhesive tape was produced in the same manner as in Example 1.

As shown in Table 1, the pressure-sensitive adhesive was 34 parts by weight of polyorganosiloxane gum and 66 parts by weight of silicone resin, 80 parts by weight of the silicone adhesive containing alkenyl group, and 20 parts of the silicone adhesive containing no alkenyl group. It is composed of parts by weight. As shown in Table 2, as for the adhesive tape using this adhesive, the adhesive force with respect to a glass plate is 5.5N / 10mm, 70 degreeC holding force is 1412 minutes, and the total amount of the low molecular siloxane of 3-10 monomers is 138 microgram / g, and 3 ~ The total amount of 20-mer low molecular siloxane was 3939 µg / g. As shown in Table 3, the plastic lens produced using this adhesive tape did not peel off the tape, retain the adhesive in the mold, change the thickness of the lens, or whiten the lens. However, a part of the lens was scratched. Couldn't get it. Moreover, even after the adhesive tape obtained by the comparative example 6 was preserve | saved for 3 months at 40 degreeC, 70 degreeC holding force falls in 1326 minutes, and both the initial holding force and 70 degreeC holding force after 3-month storage at 40 degreeC are large, and a flaw of a lens is carried out And, as a result, a good lens could not be obtained.

(Comparative Example 7)

A toluene solution containing 40 parts by weight of pressure-sensitive adhesive A, 20 parts by weight of pressure-sensitive adhesive C and 40 parts by weight of pressure-sensitive adhesive D was prepared, and 0.3 parts by weight of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) effective for the pressure-sensitive adhesive. 0.80 weight part with respect to a nil group containing adhesive and 0.50 weight part of catalysts (NC-25 by Toray Dow Corning Co., Ltd.) were stirred uniformly in toluene, and it added and stirred to the said toluene solution, and produced the adhesive solution. Using this pressure-sensitive adhesive solution, a pressure-sensitive adhesive tape was produced in the same manner as in Example 1. As shown in Table 1, the pressure-sensitive adhesive was 46 parts by weight of polyorganosiloxane gum, 54 parts by weight of silicone resin, 40 parts by weight of silicone pressure-sensitive adhesive containing alkenyl group, and 60 parts of silicone pressure-sensitive adhesive containing no alkenyl group. It is composed of parts by weight.

As shown in Table 2, as for the adhesive tape using this adhesive, adhesive force falls in 3.5 N / 10mm and 70 degreeC holding force 34 minutes, and the total amount of the low molecular siloxane of 3-10 monomers is 159 microgram / g, The total amount of 20-mer low molecular siloxane was 4620 μg / g. As shown in Table 3, the plastic lens produced using this adhesive tape did not have tape peeling, residual adhesive on the mold, scratches and whitening of the lens, but a change in the thickness of the lens occurred, resulting in obtaining a good lens. Could not. In addition, even after the adhesive tape obtained by the comparative example 7 was preserve | saved for 3 months at 40 degreeC, 70 degreeC holding force falls in 26 minutes, and both the initial holding force and the 70 degreeC holding force after storage for 3 months at 40 degreeC are small, and the thickness change of a lens Occurred, and as a result, a good quality lens could not be obtained.

(Comparative Example 8)

A toluene solution containing 60 parts by weight of pressure-sensitive adhesive B, 10 parts by weight of pressure-sensitive adhesive C and 30 parts by weight of pressure-sensitive adhesive D was prepared, and 0.6 parts by weight of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Corporation) effective for the pressure-sensitive adhesive. 1.00 weight part with respect to a nil group containing adhesive and 0.50 weight part of catalysts (NC-25 by Toray Dow Corning Co., Ltd.) were uniformly stirred and mixed in toluene, and it added and stirred to the said toluene solution, and produced the adhesive solution. Using this pressure-sensitive adhesive solution, a pressure-sensitive adhesive tape was produced in the same manner as in Example 1.

As shown in Table 1, this adhesive is 66 parts by weight of polyorganosiloxane gum, 34 parts by weight of silicone resin, 60 parts by weight of silicone adhesive containing alkenyl group, and 40 parts of silicone adhesive containing no alkenyl group. It is composed of parts by weight. As shown in Table 2, as for the adhesive tape using this adhesive, the adhesive force with respect to a glass plate is 1.5 N / 10mm, 70 degreeC holding force of 16 minutes, and the total amount of the low molecular siloxane of 3-10 monomers is 148 microgram / g, The total amount of 20-mer low molecular siloxane was 4488 μg / g. As shown in Table 3, the plastic lens produced using this adhesive tape had tape peeling, and as a result, a good lens could not be obtained. Moreover, even if the adhesive tape obtained by the comparative example 8 is preserve | saved for 3 months at 40 degreeC, a tape peels off, 70 degreeC holding power falls in 26 minutes, and 70 degreeC holding power after storage for 3 months at initial holding power and 40 degreeC is all small, Tape peeling occurred, and as a result, a good lens could not be obtained.

(Comparative Example 9)

Toluene solution containing 60 parts by weight of pressure-sensitive adhesive B, 25 parts by weight of pressure-sensitive adhesive C and 15 parts by weight of pressure-sensitive adhesive D was prepared, and 0.6 parts by weight of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) effective for the pressure-sensitive adhesive. 1.00 weight part with respect to a nil group containing adhesive and 0.50 weight part of catalysts (NC-25 by Toray Dow Corning Co., Ltd.) were uniformly stirred and mixed in toluene, and it added and stirred to the said toluene solution, and produced the adhesive solution. Using this pressure-sensitive adhesive solution, a pressure-sensitive adhesive tape was produced in the same manner as in Example 1. As shown in Table 1, this adhesive is 60 weight part of polyorganosiloxane gums, 40 weight part of silicone resins, 60 weight part of silicone adhesives containing an alkenyl group, and 40 pressure-sensitive silicone adhesives containing no alkenyl groups It is composed of parts by weight.

As shown in Table 2, in the adhesive tape using this adhesive, the adhesive force with respect to a glass plate falls at 2.0N / 10mm, 70 degreeC holding force in 28 minutes, and the total amount of the low molecular siloxane of 3-10 monomers is 110 microgram / g. , The total amount of the low molecular siloxane of 3-20 monomer was 4052 microgram / g. As shown in Table 3, the plastic lens produced using this adhesive tape did not have tape peeling, residual adhesive in the mold, scratches and whitening of the lens, but a thickness change occurred, and as a result, a good lens could not be obtained. . Moreover, even after storing for 3 months at 40 degreeC, the adhesive tape obtained by the comparative example 9 falls in 70 degreeC holding force in 33 minutes, and both the initial holding force and the 70 degreeC holding force after 3-month storage at 40 degreeC are small, and a change in thickness is seen. As a result, a good lens could not be obtained.

(Comparative Example 10)

A toluene solution containing 40 parts by weight of pressure-sensitive adhesive A, 50 parts by weight of pressure-sensitive adhesive C and 10 parts by weight of pressure-sensitive adhesive D was prepared, and 0.4 parts by weight of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Corporation) effective for the pressure-sensitive adhesive. 1.00 weight part with respect to a nil group containing adhesive and 0.50 weight part of catalysts (NC-25 by Toray Dow Corning Co., Ltd.) were uniformly stirred and mixed in toluene, and it added and stirred to the said toluene solution, and produced the adhesive solution. Using this pressure-sensitive adhesive solution, a pressure-sensitive adhesive tape was produced in the same manner as in Example 1.

As shown in Table 1, this pressure-sensitive adhesive is 34 parts by weight of polyorganosiloxane gum, 66 parts by weight of silicone resin, 40 parts by weight of silicone pressure-sensitive adhesive containing alkenyl group, and 60 parts of silicone pressure-sensitive adhesive which does not contain alkenyl group. It is composed of parts by weight. As shown in Table 2, as for the adhesive tape using this adhesive, the adhesive force with respect to a glass plate is 6.5N / 10mm high, 70 degreeC holding force falls at 110 minutes, and the total amount of the low molecular siloxane of 3-10 monomers is 80 microgram / g, and the total amount of the low molecular siloxane of 3-20 monomer was 3260 microgram / g. As shown in Table 3, the plastic lens produced using this adhesive tape did not have tape peeling, lens flaw, lens thickness change, and whitening, but mold adhesive residue occurred, and as a result, a good lens could not be obtained. . In addition, even after the adhesive tape obtained by the comparative example 10 was preserve | saved for 3 months at 40 degreeC, 70 degreeC holding force falls in 122 minutes, the change with an initial value is hardly seen, and mold adhesive residue arises, As a result, a good quality lens Couldn't get it.

(Comparative Example 11)

Toluene solution containing 40 parts by weight of pressure-sensitive adhesive A, 25 parts by weight of pressure-sensitive adhesive C, and 35 parts by weight of pressure-sensitive adhesive D was prepared, and 0.2 parts by weight of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) effective for the pressure-sensitive adhesive. 0.5 parts by weight of the Niel group-containing pressure sensitive adhesive and 0.5 parts by weight of the catalyst (NC-25, manufactured by Toray Dow Corning Co., Ltd.) were uniformly stirred and mixed in toluene, and added and stirred to the toluene solution to prepare an adhesive solution. Using this pressure-sensitive adhesive solution, a pressure-sensitive adhesive tape was produced in the same manner as in Example 1.

As shown in Table 1, this adhesive is 44 weight part of polyorganosiloxane gums, 56 weight part of silicone resins, 40 weight part of silicone adhesives containing an alkenyl group, and 60 weight part of silicone adhesives containing no alkenyl groups It is composed of parts by weight. As shown in Table 2, in the adhesive tape using this adhesive, the adhesive force with respect to a glass plate falls at 3.5 N / 10mm, 70 degreeC holding force in 22 minutes, and the total amount of the low molecular siloxane of 3-10 monomers is 96 micrograms / g. , And the total amount of low molecular siloxane of 3 to 20 monomers was 4110 µg / g. As shown in Table 3, the plastic lens produced using this adhesive tape did not have tape peeling off, mold adhesive residue, scratches and whitening of the lens, but a change in the thickness of the lens occurred, resulting in a failure to obtain a good lens. . In addition, after storing the adhesive tape obtained by the comparative example 11 for 3 months at 40 degreeC, 70 degreeC holding force falls in 124 minutes, peeling off a tape, an adhesive remain | survived in a mold, a flaw of a lens, a thickness change, and a whitening do not occur. A good lens was obtained.

(Comparative Example 12)

Toluene solution containing 55 parts by weight of pressure-sensitive adhesive A, 25 parts by weight of pressure-sensitive adhesive B and 20 parts by weight of pressure-sensitive adhesive C was prepared, and 1.3 parts by weight of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) effective for the pressure-sensitive adhesive. 1.6 weight part with respect to a nil group containing adhesive, and 0.5 weight part of catalysts (NC-25 by Toray Dow Corning Co., Ltd.) were uniformly stirred and mixed in toluene, and it added and stirred to the said toluene solution, and produced the adhesive solution. Using this pressure-sensitive adhesive solution, a pressure-sensitive adhesive tape was produced in the same manner as in Example 1.

As shown in Table 1, this adhesive is 40 weight part of polyorganosiloxane gums, 60 weight part of silicone resins, 80 weight part of silicone adhesives containing an alkenyl group, and 20 silicone pressure-sensitive adhesives which do not contain alkenyl groups It is composed of parts by weight. As shown in Table 2, as for the adhesive tape using this adhesive, the adhesive force with respect to a glass plate falls at 4.0 N / 10mm, 70 degreeC holding force at 879 minutes, and the total amount of the low molecular siloxane of 3-10 monomers is 80 microgram / g. , And the total amount of low molecular siloxane of 3 to 20 monomers was 3850 µg / g. As shown in Table 3, the plastic lens produced using this adhesive tape did not peel off the tape, retain the adhesive in the mold, change the thickness of the lens, and whiten the lens. However, the lens was scratched, resulting in a good lens. There was no. In addition, even after the adhesive tape obtained by the comparative example 12 was preserve | saved for 3 months at 40 degreeC, 70 degreeC holding force falls in 945 minutes, and both the initial holding force and the 70 degreeC holding force after 3-month storage at 40 degreeC are large, and a flaw of a lens is carried out And, as a result, a good lens could not be obtained.

1: adhesive tape for plastic lens molding
2: tape base material
3: adhesive layer
30: Mold

Claims (4)

Plastic lens molding used to form along the outer circumferential surface of a pair of molds arranged at predetermined intervals and to seal the space formed between the pair of molds to form a cavity for filling the polymerizable monomer of the plastic lens. In the adhesive tape for
The adhesive tape includes a band-shaped substrate and an adhesive layer for adhering the substrate to the outer circumferential surface of the mold, wherein the adhesive layer is composed of an adhesive containing a silicone adhesive as a main component,
(1) the said silicone adhesive contains the silicone adhesive containing an alkenyl group, and the silicone adhesive which does not contain an alkenyl group,
(2) 50 to 70 parts by weight of the silicone pressure-sensitive adhesive containing the alkenyl group,
(3) 30-50 weight part of silicone adhesives which do not contain the said alkenyl group,
(4) the crosslinking agent and the catalyst are composed of a pressure-sensitive adhesive blended so as to be 0.5 to 1.5 parts by weight based on the silicone pressure-sensitive adhesive containing an alkenyl group,
The said silicone adhesive containing an alkenyl group is a silicone adhesive which consists of a polyorganosiloxane gum (G1) and silicone resin (R1) with a crosslinking point,
The said silicone adhesive which does not contain an alkenyl group is a silicone adhesive which consists of a polyorganosiloxane gum (G2) and silicone resin (R2) which do not have a crosslinking point,
The composition ratio of the polyorganosiloxane gum (G) and the silicone resin (R) in the said silicone adhesive,
(5) 36 to 44 parts by weight of a polyorganosiloxane gum having a crosslinking point of polyorganosiloxane gum (G1) and a polyorganosiloxane gum having no crosslinking point (G2);
(6) It is an adhesive mix | blended so that the total amount of silicone resin (R1) and silicone resin (R2) may be 56-64 weight part,
(7) 70 degreeC holding force of the said adhesive tape is 50 minutes or more and 500 minutes or less,
(8) An adhesive tape for plastic lens molding, wherein the adhesive force is 2.0 N / 10 mm or more and 6.0 N / 10 mm or less. The method of claim 1,
The total amount of the low molecular siloxane (cyclic or linear polyorganosiloxane) of 3-10 monomers contained in the said silicone adhesive which is a main component of the said adhesive layer is 165 micrograms / g or less, The adhesive tape for plastic lens molding characterized by the above-mentioned. The method according to claim 1 or 2,
The dimethylpolysiloxane content of the trimer or more and 20 monomers contained in the said silicone adhesive which is a main component of the said adhesive layer is 4850 micrograms or less per 1g of adhesives which comprise the said adhesive layer, The adhesive tape for plastic lens shaping | molding. A molding method of a plastic lens molded article using the adhesive tape for molding a plastic lens according to claim 1 or 2, wherein a pair of molds are disposed to face each other at predetermined intervals, and on the outer circumferential surface of the pair of molds. A cavity forming step of adhering the plastic lens molding adhesive tape, sealing a space formed between the pair of molds to form a cavity filled with the polymerizable monomer, and a monomer filling the polymerizable monomer in the cavity And a polymerization step of polymerizing the polymerizable monomer packed into the cavity.

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