JP5464074B2 - Adhesive tape for plastic lens molding and plastic lens molding method using the same - Google Patents

Description

  The present invention relates to a plastic lens molding pressure-sensitive adhesive tape used when manufacturing a plastic lens such as a high refractive index plastic eyeglass lens or optical lens, and a plastic lens molding method using the same.

  Conventional plastic lenses are molded by a casting polymerization method using a pair of glass molds (molds) and an adhesive tape for sealing, as shown, for example, in Patent Documents 1 and 2 below.

  That is, in the conventional plastic lens, first, a pair of glass molds are arranged at a predetermined interval, and the space between the glass molds is continuously sealed along the circumferential direction with a sealing adhesive tape. Next, a resin injection nozzle is inserted into the adhesive tape, and a resin (polymerizable monomer) is injected and filled into the space formed by the pair of glass molds and sealing adhesive tape. Is produced by polymerization and curing by heating or light irradiation.

  In such a conventional method for producing a plastic lens, the volume is reduced (shrinks) when the resin injected into the pair of glass molds is polymerized and cured. For this reason, the distance between the glass molds becomes narrower than when the resin is injected, and the adhesive tape is crushed in the width direction (lens thickness direction), or the adhesive tape is pulled toward the center of the glass mold, and the adhesive tape As a result, there is a problem that wrinkle marks (lens wrinkles) of the adhesive tape remain on the peripheral surface of the molded product.

  For this reason, lens manufacturers, etc., preliminarily mold a lens larger than the target lens outer diameter in anticipation of the occurrence of such lens wrinkles on the molded lens peripheral surface, and then polish the lens side surface after molding. The lens wrinkles are removed. For this reason, when manufacturing a conventional spectacle lens, there is a problem that a troublesome polishing operation is required and the material is wasted.

  Thus, for example, Patent Document 3 below proposes a method using an adhesive tape having a load of 3 kg or less when pulled 5 mm at a temperature at which the monomer polymerization shrinkage is greatest. Moreover, in the following patent document 4, the method of using the thing with a high intensity | strength whose base material thickness is 125-200 micrometers as an adhesive tape which seals the surrounding surface of a mold is proposed.

JP-A-1-257016 JP 2003-193004 A JP 2004-202995 A JP 2006-240210 A

  By the way, the plastic lens (molded product) obtained by the manufacturing method as described above is called a so-called semi-lens, and is cut not only in the radial direction but also in the thickness direction after molding to be processed into a desired lens shape.

  Therefore, it takes a lot of work for the lens processing operation. In particular, since cutting in the lens thickness direction (CT thickness) requires a great deal of effort, there is a demand to reduce the cutting work as much as possible.

  However, in the conventional method for manufacturing a plastic lens as described above, the final thickness (CT thickness) is reduced because the molded product is greatly shrunk not only in the radial direction but also in the thickness direction during the polymerization curing reaction of the resin. ) To a certain extent thicker than.

  Therefore, the present invention has been devised to solve these problems, and a purpose thereof is to use a novel pressure-sensitive adhesive tape for plastic lens molding capable of suppressing variation in the thickness direction after molding and the use thereof. The present invention provides a plastic lens molding method.

In order to solve the above problems, the first invention
A pressure-sensitive adhesive tape for molding a plastic lens for continuously sealing between a pair of molds filled with a polymerizable monomer along the circumferential direction thereof. And a pressure-sensitive adhesive layer, wherein the pressure-sensitive adhesive layer is made of a pressure-sensitive adhesive whose cohesive force decreases at a temperature higher than a temperature at which the polymerizable monomer filled between the molds starts a polymerization reaction. This is an adhesive tape for lens molding.

In addition, the second invention,
1st invention WHEREIN: The said base material consists of a material which has a 20-50 micrometers-thick polyethylene terephthalate as a main component, It is an adhesive tape for plastic lens shaping | molding characterized by the above-mentioned.

In addition, the third invention,
1st or 2nd invention WHEREIN: The said adhesive is 95-65 mass parts of addition reaction type silicone adhesives, 5-35 mass parts of peroxide hardening type silicone adhesives, and the said addition reaction type silicone. A pressure-sensitive adhesive tape for molding plastic lenses, characterized by comprising a crosslinking agent effective as an adhesive.

In addition, the fourth invention is
In any one of the first to third inventions, the pressure-sensitive adhesive layer is a pressure-sensitive adhesive tape for molding a plastic lens, wherein the pressure-sensitive adhesive layer is provided only in a region where the molds of the base material are adhered.

In addition, the fifth invention,
After the pair of molds are positioned at a predetermined interval, the mold is held in the circumferential direction with the plastic lens molding adhesive tape according to any one of the first to fourth inventions while maintaining the interval. A step of forming a cavity by continuously sealing along, a step of filling the cavity with a polymerizable monomer, and a polymerization in the cavity with the pair of molds fixed so that the distance does not vary And a step of polymerizing a functional monomer, to form a plastic lens.

  According to the present invention, when the resin (polymerizable monomer) is injected, the adhesive layer exhibits sufficient adhesive force, cohesive force, and stretchability, so that the resin can be reliably placed in the cavity while allowing the volume expansion of the resin. Can be sealed.

  In addition, when the volume of the resin is reduced due to the polymerization reaction, the cohesive force of the adhesive layer decreases and the tape base material slides so as to slide on the mold surface following the shrinkage of the resin. If the polymerization reaction treatment is performed, fluctuations in the thickness direction after lens molding can be suppressed.

It is an expanded sectional view which shows one Embodiment of the adhesive tape 100 for plastic lens shaping | molding which concerns on this invention. It is a conceptual diagram which shows the usage method of the adhesive tape for plastic lens shaping | molding of this invention. It is sectional drawing which shows the plastic lens molding method of this invention. It is a graph which shows the relationship between resin temperature, resin volume, resin temperature, and cohesion force. It is a conceptual diagram which shows the volume change of resin accompanying a polymerization reaction, and a motion of an adhesive tape. It is an expanded sectional view which shows other embodiment of the adhesive tape 100 for plastic lens shaping | molding which concerns on this invention. It is a conceptual diagram explaining the thickness change of a plastic lens.

  Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is an enlarged cross-sectional view showing an embodiment of an adhesive tape 100 for molding a plastic lens according to the present invention, and FIG. 2 is an explanatory view showing a method of using the same.

  As shown in the figure, this plastic lens molding pressure-sensitive adhesive tape 100 has a structure in which a tape-shaped base material (tape base material) 10 has a pressure-sensitive adhesive layer 20 for adhering it to the molds 30 and 30 side.

  The base material 10 is comprised from the material which has a stretching property at least in the width direction. Specifically, a material mainly composed of polyethylene terephthalate having a thickness of about 20 to 50 μm is optimal, but other materials can be used as long as the material has stretchability in the width direction. For example, polyethylene naphthalate, polybutylene terephthalate, polyphenylene sulfide, biaxially oriented polypropylene, polyimide, aramid, cycloolefin, fluororesin resin film, composite film laminated with aluminum foil and resin film, alumina and silicon dioxide A composite film obtained by laminating a film in which a metal oxide thin film such as a resin film is formed on the surface of the resin film, and a soft aluminum foil can also be used.

  Here, when polyethylene terephthalate is used as the tape substrate 10, the thickness is limited to the range of 20 to 50 μm because the strength is too low at less than 20 μm, as will be described later. This is because there is a risk that air may enter due to cracking or cutting without resisting the expanding and contracting force. Moreover, when it exceeds 50 micrometers, there exists a possibility that the rigidity of a tape may become high and a stretching property may fall.

  On the other hand, the pressure-sensitive adhesive layer 20 ensures a gap so that the resin does not leak when a resin (polymerizable monomer) is injected into the space (cavity) defined by the pressure-sensitive adhesive tape 100 and the molds 30 and 30. It has an adhesive force that can be sealed, and is composed of an adhesive that has a property that its cohesive strength decreases when the resin (polymerizable monomer) filled in the cavity reaches a temperature range where polymerization shrinks.

In addition, generally as a parameter | index of the cohesion force of the adhesive said by this invention, a storage elastic modulus, a shear force, a retention strength etc. are mentioned, However It does not specifically limit. The storage elastic modulus is measured and evaluated using a dynamic viscoelasticity measuring device while continuously changing the temperature under the condition of a predetermined frequency. For example, two samples in which the base material side of an adhesive tape having a width of 35 mm and a length of 35 mm is fixed to a stainless steel plate using a double-sided tape are prepared and the exposed adhesive layer surfaces are overlapped with each other. Press the roller for 5 reciprocations, leave it for a specified time under each temperature condition, and use a tensile tester to
In accordance with Z0237, measurement and evaluation are performed by fixing one of the stainless steel plates and pulling the other at a predetermined speed. Holding power is JIS
In accordance with Z0237, a 25 mm wide and 25 mm long adhesive tape is applied to a 50 mm × 100 mm stainless steel plate, and a 19.6 N roller is pressed and applied once in a reciprocating manner, with a 9.8 N load applied. Measure and evaluate the deviation or drop time after standing for 24 hours.

  Specifically, the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 20 includes 95 to 65 parts by mass of an addition reaction type silicone pressure sensitive adhesive, 5 to 35 parts by mass of a peroxide curable type silicone pressure sensitive adhesive, and the addition reaction type. It is made of a material mainly composed of 0.1 to 0.2 parts by mass of a crosslinking agent effective for the silicone adhesive.

  And, as described later, the adhesive layer 20 composed of such components exhibits a sufficient adhesive force near normal temperature and securely seals the resin in the molds 30 and 30, while at a high temperature accompanying the polymerization reaction, The cohesive force is weakened and the force acting in the width direction of the tape substrate 10 is reduced.

  Here, as an addition reaction type silicone pressure sensitive adhesive, for example, KR3700, KR3701, X-40-3237-1, X-40-3240, X-40-3291-1, X- manufactured by Shin-Etsu Chemical Co., Ltd. 40-3229, X-40-3270, X-40-3306, TSR1512, TSR1516, XR37-B9204 manufactured by Momentive Performance Materials, SD4584, SD4585, SD4560, SD4570 manufactured by Toray Dow Corning Co., Ltd. SD4600PFC, SD4593 and the like, but are not particularly limited thereto.

  The addition amount of the addition reaction type silicone pressure-sensitive adhesive is limited to 95 to 65 parts by mass. If the amount is less than 65 parts by mass, liquid leakage of the polymerizable monomer occurs during the polymerization and the plastic lens is lost. It is. On the other hand, when the amount exceeds 95 parts by mass, there is a disadvantage that bubbles cannot be mixed into the lens because the shrinkage of the polymerizable monomer cannot be followed during the polymerization.

  Examples of the peroxide curable silicone adhesive include KR100 and KR101-10 manufactured by Shin-Etsu Chemical Co., Ltd., YR3340, YR3286, PSA610-SM and XR37-B6722 manufactured by Momentive Performance Materials. In addition, SH4280 manufactured by Toray Dow Corning Co., Ltd. and the like can be mentioned, but the invention is not particularly limited thereto.

  The compounding amount of this peroxide curable silicone pressure-sensitive adhesive is limited to 5 to 35 parts by mass. If the amount is less than 5 parts by mass, it cannot follow the shrinkage of the polymerizable monomer during the polymerization, and bubbles are mixed into the lens. This is because there is an inconvenience. On the other hand, if the amount exceeds 35 parts by mass, the polymerizable monomer will leak during polymerization and the plastic lens will be lost.

  Moreover, as a crosslinking agent of an addition reaction type silicone adhesive, for example, X-92-122 manufactured by Shin-Etsu Chemical Co., Ltd., CR50 manufactured by Momentive Performance Materials, Inc., BY24 manufactured by Toray Dow Corning Co., Ltd. -741 and the like, but are not particularly limited thereto.

  The amount of the crosslinking agent is limited to 0.1 to 0.2 parts by mass. If the amount is less than 0.1 parts by mass, the retention at 50 ° C. or lower is deteriorated during polymerization, and liquid leakage due to expansion occurs. This is because the plastic lens is inconvenient. On the other hand, when the amount exceeds 0.2 parts by mass, it is impossible to follow the shrinkage of the polymerizable monomer during polymerization, and the center thickness (CT) and end thickness (ET) of the lens are biased, and the target lens thickness is reached. This is because there is an inconvenience of not becoming.

  As an adhesive tape manufacturing method, an addition reaction type silicone adhesive and a peroxide curing type silicone adhesive dissolved in an organic solvent such as toluene and xylene are effective for addition reaction type silicone adhesives. There is a method in which a suitable crosslinking agent is added, and this solution is applied to a base film with a comma coater or a lip coater so that the thickness after drying is uniform, followed by drying and curing at a predetermined temperature. However, it is not particularly limited to such a method, and any of the usual production methods employed for forming the silicone-based pressure-sensitive adhesive layer on the base film can be employed.

  The molds 30 and 30 are not particularly limited in shape and material, but generally, a disk-shaped glass (silicon dioxide) or metal one is often used.

  In addition, the resin monomer used as the raw material for the plastic lens is not particularly limited. In the case of the spectacle lens, in the case of a spectacle lens having a conventionally known material, for example, an ultra high refractive index (1.65 ≦ Ne), A monomer of an episulfide resin (Mitsui Chemical Co., Ltd. MR-174, Mitsubishi Gas Chemical Co., Ltd. IU-20) or a thiourethane resin (Mitsui Chemicals Co., Ltd. MR-7) is used. In the case of a spectacle lens having a high refractive index (1.58 ≦ Ne <1.65), a thiourethane resin (MR-6 manufactured by Mitsui Chemicals, MR-8 manufactured by Mitsui Chemicals) or polyester methacrylate ( A monomer of TS-26 manufactured by Tokuyama Corporation, polycarbonate (Panlite manufactured by Teijin Chemicals Ltd.), or the like is used. In the case of eyeglass lenses having a medium refractive index (1.55 ≦ Ne <1.58), urethane methacrylate (K-23 manufactured by Kureha Co., Ltd.), epoxy methacrylate (MCR-50 manufactured by Mitsubishi Rayon Co., Ltd.), diallyl carbonate Monomers such as (HIRI manufactured by PPG Industries) and diallyl phthalate resin (NK-55 manufactured by NOF Corporation) are used. Furthermore, in the case of eyeglass lenses having a low refractive index (Ne <1.55), urethane resin (TRIPEX made by PPG Industries), urethane methacrylate (MCR-10 made by Mitsubishi Rayon Co., Ltd.), methacrylate (Kureha K.K.) -55), allyl diglycol carbonate (CR-39 manufactured by PPG Industries), diallyl carbonate (CR-607 manufactured by PPG Industries), polymethyl methacrylate (methyl polymethacrylate), and the like. It is not limited to.

  Further, as shown in FIG. 3, a plurality of pin holes 31 are perforated on the peripheral surface portions of the molds 30 and 30 so that the pins 41 and 41 of the U-shaped fixing jig 40 are respectively inserted. It has become. Further, a cut or elongated hole 11 extending in the width direction is formed in the portion of the adhesive tape 100 located in the pin hole 31 described above.

  Next, a plastic lens molding method using the plastic lens molding pressure-sensitive adhesive tape 100 of the present invention having such a configuration, and its operation and effect will be described.

  First, as shown in FIG. 2, a pair of disk-shaped molds 30, 30 are positioned at a predetermined interval, and then the mold 30, 30 is held between the molds 30, 30 while maintaining the interval by the adhesive tape 100 of the present invention. It seals continuously along the circumferential direction. As a result, as shown in the figure, the molds 30 and 30 are connected substantially in parallel, and a flat or cylindrical space (cavity) C is defined between them.

  When such a cavity C is formed, one end of the adhesive tape 100 is peeled off as shown in the figure to open a gap, and a nozzle (not shown) is inserted into the cavity C from the gap, and the cavity C is inserted from the nozzle. After injecting and filling the resin, the gap is closed again with the adhesive tape 100.

  Further, as shown in FIG. 3, the resin (polymerizable monomer) in the cavity C is heated or irradiated with light in a state where the fixing jig 40 is set and the molds 30 and 30 are fixed so that the distance does not vary. Polymerization reaction.

  FIG. 4 shows the relationship between the resin temperature, the resin volume, the resin temperature, and the cohesive force of the adhesive tape 100 during this polymerization reaction.

  As shown by the curve in the figure, the resin temperature before the polymerization reaction is about room temperature (25 ° C.), but when the resin temperature increases by heating or light irradiation, the resin first expands and its volume increases.

  When the polymerization reaction is started by this heating or light irradiation, the temperature of the resin further rises due to the reaction heat, and the volume starts to shrink gradually.

  Then, when the temperature exceeds 60 ° C. to 70 ° C., the volume of the resin becomes smaller than that at the beginning, and further becomes lowest when the polymerization reaction is completed (polymer). The volume shrinkage of the resin due to this polymerization reaction varies depending on the type of resin and the like, but generally there are many that are about 90 to 98% of the volume of the monomer state.

  On the other hand, the pressure-sensitive adhesive tape 100 of the present invention exhibits strong adhesive force up to around the temperature (about 60 ° C. to 70 ° C.) at which the volume of the resin starts to shrink, but when it exceeds this, the cohesive force gradually decreases. It has the characteristic of doing.

  FIG. 5 shows the volume change of the resin and the movement of the adhesive tape accompanying the polymerization reaction.

  First, as shown in FIG. 2A, immediately after the appropriate amount of resin is filled in the cavity C, the adhesive tape 100 is almost flat. However, when the resin is thermally expanded by heating or light irradiation, As shown in FIG. 2B, the internal pressure of the cavity C increases and the resin expands in the radial direction so as to protrude from the molds 30 and 30.

  Then, the adhesive tape 100 is pushed out to expand in the radial direction of the molds 30 and 30 due to the expansion of the resin. As described above, the adhesive tape 100 exhibits a strong adhesive force up to a predetermined temperature. Therefore, it does not easily peel off from the molds 30 and 30. Accordingly, the resin can be reliably sealed in the cavity C while allowing the volume expansion of the resin.

  Since the molds 30 and 30 are fixed by the fixing jig 40 as described above, the distance does not change even if the internal pressure of the cavity C changes, and a constant distance is always maintained. Become.

  Next, after a while after the polymerization reaction is started in this way, as shown in FIG. 5C, the resin that has been thermally expanded is turned to the opposite direction and deformed so as to be accommodated in the cavity C. .

  Then, the pressure-sensitive adhesive tape 100 is deformed so as to bend into the cavity C following this movement. When the amount of shrinkage (reaction temperature) exceeds a certain amount, the cohesive force decreases at a stretch and the pressure-sensitive adhesive tape 100 So that the adhesive surface slides so as to fall into the cavity C. As a result, excessive force is not applied to the tape substrate 10 and the molds 30, 30, so that it is possible to reliably prevent air from entering due to cracking of the tape substrate 10 and to suppress the generation of bubbles in the plastic lens.

  As described above, according to the plastic lens molding method using the pressure-sensitive adhesive tape 100 of the present invention, the tape base material 10 expands along with the volume expansion, and the cohesive force weakens when the resin volume decreases due to the polymerization reaction. Thus, the tape base material moves so as to slide on the mold surface following the resin.

  Thus, by performing the polymerization reaction process while maintaining the distance between the molds, it is possible to suppress the variation in the thickness direction after lens molding as shown in FIG. This eliminates the need for cutting in the thickness direction after lens molding, and can greatly simplify subsequent lens processing operations.

  In addition, in this Embodiment, although it was set as the structure which provided the adhesion layer 20 in the one side (adhesion surface) of the tape base material 10, each mold 30,30 of the tape base material 10 is adhere | attached as shown in FIG. The adhesive layer 20 may be provided only in the region (both sides).

  With such a configuration, it is possible to reduce the amount of the pressure-sensitive adhesive used to form the pressure-sensitive adhesive layer 20 and to avoid the inconvenience that a part of the pressure-sensitive adhesive adheres to the molded product.

  The configuration of the plastic lens molding pressure-sensitive adhesive tape of the present invention will be specifically described with reference to examples. However, the pressure-sensitive adhesive tape of the present invention is not limited to this.

[Test Example 1]
95 parts by mass of an addition reaction type silicone adhesive (X-40-3240 manufactured by Shin-Etsu Chemical Co., Ltd.), 5 parts by mass of a peroxide curing type silicone adhesive (PSA610-SM manufactured by Momentive Performance Materials), 0.10 parts by mass of a crosslinking agent (X-92-122, manufactured by Shin-Etsu Chemical Co., Ltd.) effective for the addition reaction type silicone adhesive was uniformly stirred and mixed in toluene to prepare an adhesive solution. This pressure-sensitive adhesive solution is coated and dried on a polyester (PET) film substrate (thickness 50 μm) manufactured by Toray Industries, Inc. so that the thickness of the pressure-sensitive adhesive layer is 20 μm. Is sometimes referred to as an adhesive tape).

  As shown in Table 1, plastic lenses made using this adhesive tape are non-defective lenses that are free from thickness change, air bubbles, and liquid leakage, and do not require lens side polishing or lens surface cutting. It was. Therefore, it can be said that this adhesive tape has characteristics necessary for lens molding.

  The thickness change means that a lens having a thickness smaller than that of a plastic lens to be originally obtained can be obtained by contraction in the thickness direction of the resin accompanying the polymerization reaction. FIG. 7 shows the shape of the molded plastic lens product to be obtained by a broken line, and shows the shape of the plastic lens having a changed thickness (changed shape) by a solid line. The bubble mixing means that bubbles generated at the time of polymerization are mixed in the peripheral portion of the produced plastic lens. Furthermore, the liquid leakage means that a liquid resin (polymerizable monomer) leaks from the cavity during lens molding.

[Test Example 2]
70 parts by mass of an addition reaction type silicone adhesive (Momentive Performance Materials TSR1512), 30 parts by mass of a peroxide curing type silicone adhesive (KR100 manufactured by Shin-Etsu Chemical Co., Ltd.), the addition reaction type silicone An adhesive solution was prepared by uniformly stirring and mixing 0.15 parts by mass of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) effective in an adhesive. This pressure-sensitive adhesive solution was coated and dried on a PET film substrate (thickness: 24 μm) manufactured by Teijin DuPont Co., Ltd. so that the thickness of the pressure-sensitive adhesive layer was 20 μm to obtain a pressure-sensitive adhesive tape for molding plastic lenses having a total thickness of 44 μm.

  As shown in Table 1, plastic lenses made using this adhesive tape are non-defective lenses that are free from thickness change, air bubbles, and liquid leakage, and do not require lens side polishing or lens surface cutting. It was. Therefore, it can be said that this adhesive tape has characteristics necessary for lens molding.

[Test Example 3]
65 parts by mass of addition reaction type silicone adhesive (SD4560 manufactured by Toray Dow Corning Co., Ltd.), 35 parts by mass of peroxide curing type silicone adhesive (KR101-10 manufactured by Shin-Etsu Chemical Co., Ltd.), the above addition reaction type A pressure-sensitive adhesive solution was prepared by uniformly stirring and mixing 0.20 parts by mass of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) effective in a silicone pressure-sensitive adhesive. This pressure-sensitive adhesive solution was applied to an aluminum / polyester film composite base material (thickness 20 μm) manufactured by Aya Aluminum Co., Ltd. so that the thickness of the pressure-sensitive adhesive layer was 20 μm, and a pressure-sensitive adhesive tape for molding plastic lenses having a total thickness of 40 μm was obtained. .

  As shown in Table 1, plastic lenses made using this adhesive tape are non-defective lenses that are free from thickness change, air bubbles, and liquid leakage, and do not require lens side polishing or lens surface cutting. It was. Therefore, it can be said that this adhesive tape has characteristics necessary for lens molding.

[Test Example 4]
96 parts by mass of an addition reaction type silicone adhesive (SD4560 manufactured by Toray Dow Corning Co., Ltd.), 4 parts by mass of a peroxide curing type silicone adhesive (KR101-10 manufactured by Shin-Etsu Chemical Co., Ltd.), 0.10 parts by mass of a crosslinking agent (X-92-122 manufactured by Shin-Etsu Chemical Co., Ltd.) effective for a silicone adhesive was uniformly stirred and mixed in toluene to prepare an adhesive solution. This pressure-sensitive adhesive solution was coated and dried on a PET base material (thickness 25 μm) manufactured by Toyobo Co., Ltd. so that the thickness of the pressure-sensitive adhesive layer was 20 μm, to obtain a pressure-sensitive adhesive tape for plastic lens molding having a total thickness of 45 μm.

  As shown in Table 1, the plastic lens produced using this adhesive tape could not suppress air bubbles mixing in the lens molding, but it did not change in thickness and liquid leakage, and can be used by polishing the lens side surface. A level lens could be obtained.

[Test Example 5]
64 parts by mass of an addition reaction type silicone adhesive (SD4560 manufactured by Toray Dow Corning Co., Ltd.), 36 parts by mass of a peroxide curing type silicone adhesive (KR101-10 manufactured by Shin-Etsu Chemical Co., Ltd.), 0.10 parts by mass of a crosslinking agent (X-92-122 manufactured by Shin-Etsu Chemical Co., Ltd.) effective for a silicone adhesive was uniformly stirred and mixed in toluene to prepare an adhesive solution. This pressure-sensitive adhesive solution was coated and dried on a PET substrate (thickness 25 μm) manufactured by Toyobo so that the pressure-sensitive adhesive layer had a thickness of 20 μm, to obtain a pressure-sensitive adhesive tape for molding a plastic lens having a total thickness of 45 μm.

  As shown in Table 1, the plastic lens produced using this adhesive tape leaked liquid when the lens was molded and a part of the plastic lens was chipped and air bubbles were mixed in, but the thickness did not change. A lens having a usable level could be obtained by polishing the side surface.

[Test Example 6]
70 parts by mass of an addition reaction type silicone adhesive (Momentive Performance Materials TSR1512), 30 parts by mass of a peroxide curing type silicone adhesive (KR100 manufactured by Shin-Etsu Chemical Co., Ltd.), the addition reaction type silicone An adhesive solution was prepared by uniformly stirring and mixing 0.15 parts by mass of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) effective in an adhesive. This pressure-sensitive adhesive solution is applied to a PET / PET composite base material (thickness 51 μm) manufactured by Mitsubishi Plastics Co., Ltd. so that the thickness of the pressure-sensitive adhesive layer is 20 μm, and an adhesive tape for molding a plastic lens having a total thickness of 71 μm is obtained. It was.

  As shown in Table 1, the plastic lens produced using this pressure-sensitive adhesive tape could not completely suppress bubble mixing in lens molding, but thickness change and liquid leakage did not occur. Although the quality of the obtained lens was slightly lower than those of Test Examples 1 to 3, a good lens could be obtained by polishing the side surface of the lens.

[Test Example 7]
70 parts by mass of an addition reaction type silicone adhesive (Momentive Performance Materials TSR1512), 30 parts by mass of a peroxide curing type silicone adhesive (KR100 manufactured by Shin-Etsu Chemical Co., Ltd.), the addition reaction type silicone An adhesive solution was prepared by uniformly stirring and mixing 0.15 parts by mass of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) effective in an adhesive. This pressure-sensitive adhesive solution was coated and dried on a PET film substrate (thickness 19 μm) manufactured by Teijin DuPont Co., Ltd. so that the thickness of the pressure-sensitive adhesive layer was 20 μm, and a pressure-sensitive adhesive tape for molding plastic lenses having a total thickness of 39 μm was obtained.

  As shown in Table 1, the plastic lens produced using this pressure-sensitive adhesive tape was partially leaked during molding of the lens and could not completely suppress the mixing of bubbles, but no change in thickness occurred. Although the quality of the obtained lens was slightly lower than those of Test Examples 1 to 3, a good lens could be obtained by polishing the side surface of the lens.

[Test Example 8]
70 parts by mass of an addition reaction type silicone adhesive (Momentive Performance Materials TSR1512), 30 parts by mass of a peroxide curing type silicone adhesive (KR100 manufactured by Shin-Etsu Chemical Co., Ltd.), the addition reaction type silicone A pressure-sensitive adhesive solution was prepared by uniformly stirring and mixing 0.21 parts by mass of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) effective in a pressure-sensitive adhesive. This pressure-sensitive adhesive solution was applied to a Toray PET / PET composite substrate (thickness 23 μm) so that the thickness of the pressure-sensitive adhesive layer was 20 μm and dried to obtain a pressure-sensitive adhesive tape for molding a plastic lens having a total thickness of 43 μm.

  As shown in Table 1, the plastic lens produced using this pressure-sensitive adhesive tape had a slight thickness change during lens molding and could not completely suppress the mixing of bubbles, but no liquid leakage occurred. Although the quality of the obtained lens was slightly lower than those of Test Examples 1 to 3, a good lens could be obtained by cutting the lens surface and polishing the lens side surface.

[Test Example 9]
70 parts by mass of an addition reaction type silicone adhesive (Momentive Performance Materials TSR1512), 30 parts by mass of a peroxide curing type silicone adhesive (KR100 manufactured by Shin-Etsu Chemical Co., Ltd.), the addition reaction type silicone A pressure-sensitive adhesive solution was prepared by uniformly stirring and mixing 0.09 parts by mass of a crosslinking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) effective in a pressure-sensitive adhesive. This pressure-sensitive adhesive solution was coated and dried on a PET film substrate (thickness: 23 μm) manufactured by Toray Industries, Inc. so that the thickness of the pressure-sensitive adhesive layer was 20 μm, to obtain a pressure-sensitive adhesive tape for molding plastic lenses having a total thickness of 43 μm.

  As shown in Table 1, the plastic lens produced using this pressure-sensitive adhesive tape was partially leaked during molding of the lens and could not completely suppress the mixing of bubbles, but no change in thickness occurred. Although the quality of the obtained lens was slightly lower than those of Test Examples 1 to 3, a good lens could be obtained by polishing the side surface of the lens.

DESCRIPTION OF SYMBOLS 100 ... Adhesive tape for plastic lens molding 10 ... Tape base material 11 ... Cut or long hole 20 ... Adhesive layer 30 ... Mold 31 ... Fixing hole 40 ... Fixing jig 41 ... Fixing pin C ... Cavity

Claims (5)

A plastic lens molding pressure-sensitive adhesive tape for continuously sealing between a pair of molds filled with a polymerizable monomer along its circumferential direction,
While having an adhesive layer for adhering this to the mold side on the tape substrate having extensibility,
A pressure-sensitive adhesive tape for molding a plastic lens, wherein the pressure-sensitive adhesive layer is made of a pressure-sensitive adhesive whose cohesive force is lowered at a temperature equal to or higher than a temperature at which a polymerizable monomer filled between the molds starts a polymerization reaction. In the adhesive tape for plastic lens molding according to claim 1,
The adhesive tape for plastic lens molding, wherein the tape base material is made of a material mainly composed of polyethylene terephthalate having a thickness of 20 to 50 µm. In the adhesive tape for plastic lens molding according to claim 1 or 2,
95 to 65 parts by mass of an addition reaction type silicone adhesive, 5 to 35 parts by mass of a peroxide curing type silicone adhesive, and a crosslinking agent effective for the addition reaction type silicone adhesive. An adhesive tape for molding plastic lenses, characterized by comprising a main component. In the adhesive tape for plastic lens molding according to any one of claims 1 to 3,
The pressure-sensitive adhesive tape for molding a plastic lens, wherein the pressure-sensitive adhesive layer is provided only in a region where the respective molds of the tape base material are adhered. After a pair of molds are positioned at a predetermined interval, the circumferential direction is maintained between the molds while maintaining the interval with the adhesive tape for molding a plastic lens according to any one of claims 1 to 4. Forming a cavity by continuously sealing along
Filling the cavity with a polymerizable monomer;
And a step of polymerizing the polymerizable monomer in the cavity in a state where the pair of molds are fixed so that the distance does not fluctuate.

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