JP2012107125A - Adhesive tape for molding plastic lens and method for molding plastic lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive tape for molding a plastic lens, the tape hardly inducing clouding and bubbles caused by an adhesive in a plastic lens, and to provide a method for molding a plastic lens.SOLUTION: The adhesive tape 100 for molding a plastic lens has a structure having an adhesive layer 20 disposed on one surface of a tape base material 10. The adhesive layer 20 is constituted of an adhesive, which containing as a principal component a mixture comprising an addition reaction type silicone adhesive in an amount of 80 mass% or more and 95 mass% or less and a peroxide curable silicone adhesive by in an amount of mass% or more and 20 mass% or less, and which contains a crosslinking agent mixed therein effective on the addition reaction type silicone adhesive. The adhesive containing as a principal component the mixture is heat treated so as to control the content of dimethyl polysiloxane comprising 3 or more and 20 or less monomers to be 4,850 μg or less per 1 g of the adhesive containing as a principal component the mixture. A plastic lens is molded by using the adhesive tape 100 for molding a plastic lens and a pair of molds 30.

Description

  The present invention relates to an adhesive tape for molding a plastic lens used when producing a plastic lens such as a plastic lens having a high refractive index or an optical lens, and a molding method for producing a plastic lens using the adhesive tape. .

  A conventional plastic lens is molded by a casting polymerization method using a pair of glass molds (molds) and an adhesive tape for sealing, as disclosed in Patent Documents 1 and 2, for example. That is, the conventional plastic lens is manufactured as follows. First, a pair of glass molds are arranged to face each other at a predetermined interval, and an adhesive tape for sealing is applied along the circumferential direction to the entire outer peripheral edge of these glass molds to open a gap between the glass molds. Is continuously sealed.

  Next, a resin injection nozzle is inserted into the adhesive tape, and a liquid resin (polymerizable monomer) is injected and filled into the space formed by the pair of glass molds and the sealing adhesive tape. Thereafter, the resin is polymerized and cured by heating or light irradiation to obtain a plastic lens.

  In such a conventional method for producing a plastic lens, low molecular weight siloxane (mainly 3-20 mer cyclic, linear dimethylpolysiloxane) is eluted from the adhesive layer of the silicone adhesive tape for sealing. In some cases, the resin (polymerizable monomer) is mixed. Since the low molecular weight siloxane and the resin (polymerizable monomer) are difficult to mix uniformly and form a sea island, white turbidity resulting from the low molecular weight siloxane may occur in the plastic lens after curing.

  Silanol is also eluted from the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape for sealing. If the polymerizable monomer is, for example, a mixture of polyisocyanate and polythiol, the OH group of silanol eluted from the pressure-sensitive adhesive layer during polymerization of lens molding. Since carbon dioxide is generated by the reaction of the NCO group of the polyisocyanate in the polymerizable monomer, there is a possibility that bubbles are generated at the outer peripheral edge of the cured plastic lens.

  Technologies for suppressing the occurrence of white turbidity and bubbles in the plastic lens as described above have been proposed in Patent Documents 2 and 3, but depending on these technologies, both the occurrence of white turbidity and bubbles due to the adhesive are sufficiently sufficient. Since there are cases where it cannot be suppressed, further improvements have been demanded.

JP-A-1-257016 JP 2003-193004 A JP 2001-316645 A

  SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a plastic lens molding pressure-sensitive adhesive tape that solves the above-described problems of the prior art and is less likely to cause white turbidity and bubbles due to the pressure-sensitive adhesive. Another object of the present invention is to provide a method for molding a plastic lens in which white turbidity and bubbles caused by an adhesive are unlikely to occur.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have developed a pressure-sensitive adhesive mainly composed of a mixture in which an addition reaction type silicone pressure-sensitive adhesive and a peroxide-curing type silicone pressure-sensitive adhesive are blended at a specific ratio. The total amount of low molecular weight siloxane (3 to 20-mer cyclic, linear dimethylpolysiloxane) contained in the pressure-sensitive adhesive containing the mixture as a main component is 1 g of the pressure-sensitive adhesive containing the mixture as a main component. If it is set to 4850 μg or less, the elution of the silanol or low molecular weight siloxane into the polymerizable monomer of the plastic lens from the adhesive mainly composed of the above mixture can be reduced, and the generation of white turbidity and bubbles in the molded lens is suppressed. In addition, low molecular weight siloxane (3- to 10-mer cyclic, linear dimethylpolysiloxane) contained in the pressure-sensitive adhesive mainly composed of the mixture. Total amount, if the mixture to be equal to or less than 165μg per PSA 1g mainly found that white turbidity occurs and bubble generation of the molded lens can be further suppressed, leading to completion of the present invention.

  The present invention has the following configuration. That is, the adhesive tape for plastic lens molding according to the present invention is attached to the outer peripheral edge of a pair of molds facing each other at a predetermined interval, and the opening of the space formed between the two molds is sealed, An adhesive tape for molding a plastic lens used for forming a cavity filled with a polymerizable monomer of a plastic lens, comprising: a tape-like base material; and an adhesive layer for adhering the base material to the mold; The layer is composed of a pressure-sensitive adhesive mainly composed of a mixture composed of 80% by mass to 95% by mass of an addition reaction type silicone pressure sensitive adhesive and 5% by mass to 20% by mass of a peroxide curable silicone pressure sensitive adhesive. The dimethylpolysiloxane content of the trimer to the 20-mer in the pressure-sensitive adhesive mainly composed of the mixture is a pressure-sensitive adhesive mainly composed of the mixture. And equal to or less than 1g per 4850Myug.

  In addition, the adhesive tape for molding a plastic lens according to the present invention is attached to the outer peripheral edge of a pair of molds facing each other at a predetermined interval, and the opening of the space formed between the two molds is sealed. An adhesive tape for molding a plastic lens used for forming a cavity filled with a polymerizable monomer of a plastic lens, comprising: a tape-like base material; and an adhesive layer for adhering the base material to the mold; The layer is composed of a pressure-sensitive adhesive mainly composed of a mixture composed of 80% by mass to 95% by mass of an addition reaction type silicone pressure sensitive adhesive and 5% by mass to 20% by mass of a peroxide curable silicone pressure sensitive adhesive. And the dimethylpolysiloxane content of the trimer to the 10-mer in the pressure-sensitive adhesive containing the mixture as a main component is the pressure-sensitive adhesive 1 containing the mixture as a main component. Characterized in that it is per 165μg or less.

  Furthermore, the adhesive tape for molding a plastic lens according to the present invention is attached to the outer peripheral edge of a pair of molds facing each other at a predetermined interval, and the opening of the space formed between the two molds is sealed, An adhesive tape for molding a plastic lens used for forming a cavity filled with a polymerizable monomer of a plastic lens, comprising: a tape-like base material; and an adhesive layer for adhering the base material to the mold; The layer is composed of a pressure-sensitive adhesive mainly composed of a mixture composed of 80% by mass to 95% by mass of an addition reaction type silicone pressure sensitive adhesive and 5% by mass to 20% by mass of a peroxide curable silicone pressure sensitive adhesive. And the dimethylpolysiloxane content of the trimer to the 10-mer in the pressure-sensitive adhesive mainly composed of the mixture is a pressure-sensitive adhesive mainly composed of the mixture. And equal to or less than g per 50 [mu] g.

  Furthermore, a plastic lens molding method according to the present invention is a method of manufacturing a plastic lens using the above-described adhesive tape for molding a plastic lens according to the present invention, and a pair of molds are separated from each other at a predetermined interval. The plastic lens molding adhesive tape is affixed to the outer peripheral edges of the two molds, and the opening of the space formed between the two molds is sealed to fill the polymerizable monomer of the plastic lens. A cavity forming step for forming a cavity; a monomer filling step for filling the polymerizable monomer in the cavity; and a polymerization step for polymerizing the polymerizable monomer filled in the cavity. .

  If the pressure-sensitive adhesive tape for molding a plastic lens according to the present invention is used, white turbidity and bubbles caused by the pressure-sensitive adhesive are less likely to occur in the plastic lens during the production of the plastic lens. Further, according to the method for molding a plastic lens according to the present invention, white turbidity and bubbles caused by the pressure-sensitive adhesive are hardly generated in the plastic lens.

It is sectional drawing which shows the structure of one Embodiment of the adhesive tape for plastic lens shaping | molding based on this invention. It is a conceptual diagram explaining one Embodiment of the plastic lens molding method which concerns on this invention. It is sectional drawing which shows the structure of another embodiment of the adhesive tape for plastic lens shaping | molding which concerns on this invention. It is GC-FID (gas chromatograph with a flame ionization detector) analysis chart of low molecular weight siloxane.

  DESCRIPTION OF EMBODIMENTS Embodiments of a plastic lens molding pressure-sensitive adhesive tape and a plastic lens molding method according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a pressure-sensitive adhesive tape for molding a plastic lens of the present embodiment (a cross-sectional view cut along a plane perpendicular to the longitudinal direction of the tape), and FIG. 2 illustrates a method for molding a plastic lens of the present embodiment. FIG. In the following drawings, the same or corresponding parts are denoted by the same reference numerals.

  As shown in FIG. 1, the pressure-sensitive adhesive tape 100 for molding a plastic lens according to the present embodiment is formed on a substantially entire surface of one side of a tape-like base material 10 (hereinafter also referred to as a tape base material) 10. , 30 is provided with an adhesive layer 20 to be adhered.

  Next, a method for molding a plastic lens using such an adhesive tape 100 for molding a plastic lens will be described.

  First, as shown in FIG. 2, for example, a pair of molds 30, 30 each having a substantially disk shape are disposed opposite to each other with a predetermined interval, and then the plastic lens molding adhesive is placed on the outer peripheral edge of both molds 30, 30. The tape 100 is attached so as to be wound along the circumferential direction, and the opening of the space formed between the molds 30 and 30 is continuously sealed while maintaining the interval. As a result, as shown in FIG. 2, the molds 30 are connected in parallel with each other, and a flat or cylindrical cavity C is defined between them (cavity forming step).

  When such a cavity C is formed, as shown in FIG. 2, one end of the plastic lens molding adhesive tape 100 is peeled to open a gap, and a nozzle (not shown) is inserted into the cavity C from the gap. Then, after filling and filling a liquid resin (polymerizable monomer) into the cavity C from the nozzle, the gap is closed again with the adhesive tape 100 for molding a plastic lens (monomer filling step).

  As the resin (polymerizable monomer), a mixture of m-xylylene diisocyanate and pentaerythritol tetrakis mercaptopropionate or a mixture of m-xylylene diisocyanate and bis (mercaptoethyl) trithioglycerin is used. However, it is not particularly limited to these.

  Further, after that, a fixing jig (not shown) is attached to fix the molds 30 and 30 so that the distance does not fluctuate. Since the molds 30 are fixed by a fixing jig, the interval does not change even when the internal pressure of the cavity C changes, and a constant interval is always maintained. Then, the resin (polymerizable monomer) in the cavity C is cured by a polymerization reaction by heating or light irradiation (polymerization step). After the resin (polymerizable monomer) is sufficiently cured, the plastic lens molding pressure-sensitive adhesive tape 100 is completely peeled off and the molds 30 and 30 are removed to obtain a plastic lens.

  In such a plastic lens molding pressure-sensitive adhesive tape 100, the pressure-sensitive adhesive layer 20 is composed of 80 mass% or more and 95 mass% or less of an addition reaction type silicone pressure sensitive adhesive, and 5 mass% or more and 20 mass% or less of a peroxide curable silicone pressure sensitive adhesive. A pressure-sensitive adhesive comprising, as a main component, a mixture of 0.12 parts by mass to 0.20 parts by mass of a crosslinking agent effective for the addition reaction type silicone pressure-sensitive adhesive with respect to 100 parts by mass of the mixture. It is configured.

  Since such an adhesive layer 20 has a sufficient adhesive force, a resin (polymerizable monomer) was injected into the cavity C formed by the plastic lens molding adhesive tape 100 and the pair of molds 30 and 30. In this case, the resin (polymerizable monomer) can be reliably sealed in the cavity C so that the resin (polymerizable monomer) does not leak.

  The peroxide-curing silicone pressure-sensitive adhesive contains silanol and low molecular weight siloxane (mainly 3 to 20-mer cyclic and / or linear dimethylpolysiloxane) as impurities. Is eluted from the adhesive layer 20 and mixed into the resin (polymerizable monomer). Conventionally, the above-described white turbidity and bubbles may occur in the inner and outer peripheral portions of the plastic lens after curing. .

  However, the pressure-sensitive adhesive used for the plastic lens molding pressure-sensitive adhesive tape 100 of the present embodiment is a ratio of the peroxide-curable silicone pressure-sensitive adhesive in the mixture of the addition reaction type silicone pressure-sensitive adhesive and the peroxide-curable silicone pressure-sensitive adhesive. Is as low as 20% by mass or less, and firstly, the amount of silanol eluted is small. Therefore, it is difficult for bubbles to be generated in the inner and outer peripheral edges of the cured plastic lens.

  Furthermore, secondly, the pressure-sensitive adhesive used for the plastic lens molding pressure-sensitive adhesive tape 100 of the present embodiment is subjected to, for example, the treatment described below for the content of low-molecular weight siloxane of 3 to 20-mer in the pressure-sensitive adhesive. The amount of elution of low molecular weight siloxane (mainly 3 to 20-mer cyclic and / or linear dimethylpolysiloxane) is greatly reduced because it is 4850 μg or less per 1 g of the pressure-sensitive adhesive containing the mixture as a main component. Reduced to Therefore, white turbidity hardly occurs in the inside and the outer peripheral edge of the cured plastic lens.

  The treatment for reducing the content of low molecular weight siloxane in the pressure-sensitive adhesive used in the plastic lens molding pressure-sensitive adhesive tape 100 of the present embodiment is at least one of a peroxide-curing type silicone pressure-sensitive adhesive and an addition reaction type silicone pressure-sensitive adhesive. It must be applied to a peroxide curable silicone adhesive. The treatment method for reducing the content of low molecular weight siloxane in the peroxide curable silicone pressure-sensitive adhesive is not particularly limited, but the raw material of the peroxide curable silicone pressure sensitive adhesive or the peroxide curable silicone A method of subjecting the adhesive to heat treatment or reduced pressure treatment to volatilize and reduce low molecular weight siloxane is preferred.

  The amount of low molecular weight siloxane is a quantitative analysis chart using the GC-FID apparatus shown in FIG. 4 (Dn in FIG. 4 (n = integer of 3 to 20) represents an n-mer of low molecular weight siloxane) The amount of 3 to 20-mer dimethylpolysiloxane is 4850 μg or less, preferably 3 to 10-mer dimethylpolysiloxane is 165 μg or less, more preferably 3 The amount of the 10-mer dimethylpolysiloxane is preferably 50 μg or less, that is, an amount capable of sufficiently suppressing the occurrence of cloudiness. The dimethylpolysiloxane may be cyclic or linear, and the amount of the dimethylpolysiloxane is the total of the cyclic dimethylpolysiloxane and the linear dimethylpolysiloxane.

As a method for volatilizing and reducing low molecular weight siloxane, for example, (1) silicone gum forming a silicone adhesive or MQ (M unit: (CH ₃ ) ₃ SiO _1/2 , Q unit: SiO ₂ ) resin is used in advance. A method of reducing the low molecular weight siloxane by volatilizing the low molecular weight siloxane by high-temperature stirring or kneading (reduced pressure strip) under reduced pressure at the raw material stage, (2) Depressurizing at the stage of mixing the silicone gum or MQ resin to produce the base adhesive Alternatively, heat is applied under normal pressure to reduce the low molecular weight siloxane by volatilizing the low molecular weight siloxane, or (3) heat is applied in the step of applying and drying the silicone adhesive solution to the substrate, and the low molecular weight siloxane is applied to the adhesive layer. And a method of reducing the volume by volatilizing the liquid. It is also possible to combine these processing methods. Considering productivity and cost, the treatment method substantially corresponding to (3) is most preferable in that the adhesive can be spread in a web shape and low molecular weight siloxane can be efficiently volatilized. By applying these treatments, the amount of low molecular weight siloxane eluted from the silicone adhesive can be reduced. Therefore, white turbidity hardly occurs in the inside and the outer peripheral edge of the cured plastic lens.

  The temperature at the time of treatment for reducing the amount of low molecular weight siloxane is not particularly limited, but heat treatment at a temperature higher than the polymerization temperature of the resin (polymerizable monomer) at the time of molding the lens, particularly at the highest temperature reached at the time of polymerization. Is preferred. By such heat treatment, the low molecular weight siloxane can be volatilized from the silicone adhesive. Although the temperature of heat processing changes with kinds of resin (polymerizable monomer), 130 degreeC or more is preferable, 150 degreeC or more is more preferable, 180 degreeC or more is further more preferable. At temperatures exceeding 200 ° C., depending on the treatment time, the main chain of the organopolysiloxane may be cleaved, resulting in an increase in low molecular weight siloxane, and in the treatment method (3) above, Since there is a risk of deformation, the upper limit is preferably 200 ° C.

  Further, conditions other than the temperature during the heat treatment, such as treatment time and atmosphere (type of atmospheric gas, atmospheric pressure, air velocity) are not particularly limited, and the heat treatment conditions are not limited to those in the adhesive mainly composed of the mixture. The amount of 3 to 20-mer dimethylpolysiloxane is 4850 μg or less per 1 g of the pressure-sensitive adhesive containing the mixture as a main component, preferably the amount of 3 to 10-mer dimethylpolysiloxane is the pressure-sensitive adhesive containing the mixture as a main component. 165 μg or less per gram of agent, more preferably 3 to 10-mer dimethylpolysiloxane is 50 μg or less per gram of the pressure-sensitive adhesive mainly composed of the above mixture, that is, generation of cloudiness is sufficiently suppressed. It should be set as follows. When this treatment is not performed, the amount of low molecular weight siloxane (3 to 20-mer dimethylpolysiloxane) exceeds 4850 μg per 1 g of the pressure-sensitive adhesive mainly composed of the mixture.

  Furthermore, the timing for applying the treatment for reducing the amount of low molecular weight siloxane to the adhesive is not particularly limited, and it is possible to add a single peroxide curable silicone adhesive before mixing with the addition reaction type silicone adhesive. It may be applied to a mixture of an addition reaction type silicone pressure-sensitive adhesive and a peroxide-curing type silicone pressure-sensitive adhesive, or may be applied after the crosslinking agent is mixed with this mixture. That is, the treatment may be performed at the stage of the pressure-sensitive adhesive material, or the treatment may be performed on the completed pressure-sensitive adhesive. Moreover, when the adhesive solution is applied to the tape substrate 10 to form the adhesive layer 20, or after the adhesive layer 20 is completed, the treatment may be performed. Among them, the method of performing heat treatment in a state where the addition reaction type silicone adhesive and the peroxide curing type silicone adhesive are mixed is applicable not only to the peroxide curing type silicone adhesive but also to the addition reaction type silicone adhesive. Since low molecular weight siloxane is reduced, it is more preferable.

  Thus, if a plastic lens is manufactured using the adhesive tape 100 for molding a plastic lens of the present embodiment, white turbidity and bubbles are less likely to be generated in the inner and outer peripheral portions of the cured plastic lens, so the yield is high. Plastic lenses can be manufactured.

  In addition, in this embodiment, although the adhesion layer 20 was provided in the one side (adhesion surface) of the tape base material 10, as shown in FIG. The adhesive layer 20 may be provided only on both sides. With such a configuration, the amount of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 20 can be reduced, and the low molecular weight siloxane and silanol in the pressure-sensitive adhesive can be prevented from eluting into the monomer. The inconvenience that the portion adheres to the molded product is less likely to occur.

  Below, the tape base material 10, the pressure-sensitive adhesive layer 20, and the silicone pressure-sensitive adhesive that is the raw material of the pressure-sensitive adhesive (that is, the addition reaction type silicone pressure-sensitive adhesive, peroxide) constituting the plastic lens molding pressure-sensitive adhesive tape 100 of the present embodiment. The curable silicone adhesive) and the crosslinking agent will be described in detail.

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

  Further, the peroxide curable silicone pressure-sensitive adhesive is not particularly limited. For example, KR100 and KR101-10 manufactured by Shin-Etsu Chemical Co., Ltd., YR3340, YR3286 and PSA610 manufactured by Momentive Performance Materials, Inc. -SM, XR37-B6722 and SH4280 manufactured by Toray Dow Corning Corporation.

  The mixture of the addition reaction type silicone pressure sensitive adhesive and the peroxide curable type silicone pressure sensitive adhesive comprises 80% by mass or more and 95% by mass or less of the addition reaction type silicone adhesive and 5% by mass or more and 20% by mass of the peroxide curable type silicone adhesive. %, But when the proportion of the peroxide-curing silicone pressure-sensitive adhesive exceeds 20% by mass (that is, the proportion of the addition-reactive silicone pressure-sensitive adhesive is less than 80% by mass), the peroxide is cured. Since the ratio of the type silicone pressure-sensitive adhesive is too large, the amount of silanol and low molecular weight siloxane to be eluted increases, and bubbles and white turbidity are likely to occur in the inner and outer peripheral edges of the plastic lens.

  On the other hand, when the ratio of the peroxide curable silicone pressure-sensitive adhesive is less than 5% by mass (that is, the ratio of the addition reaction type silicone pressure-sensitive adhesive exceeds 95% by mass), the adhesive strength of the pressure-sensitive adhesive layer 20 is insufficient. Thus, it is difficult to maintain the distance between the molds 30 and 30 by the plastic lens molding adhesive tape 100, and there is a possibility that chipping of the periphery of the lens due to leakage of the polymerizable monomer liquid may occur. Further, since adhesive residue is likely to occur in the plastic lens and both molds 30 and 30, it becomes necessary to polish the outer periphery of the plastic lens and to remove and clean the adhesive from the mold 30, thereby reducing yield and workability. There is a risk. In particular, since the polymerization temperature of the polymerizable monomer when producing a high refractive lens having a refractive index of 1.60 or more is a high temperature of 130 ° C. or higher, the adhesive force capable of maintaining the above-described spacing even at such a high temperature is adhered. In order to apply to the layer 20, it is necessary to use at least 5% by mass of a peroxide curable silicone pressure-sensitive adhesive.

  Furthermore, in the pressure-sensitive adhesive mainly composed of the mixture of the addition reaction type silicone pressure sensitive adhesive and the peroxide curable type silicone pressure sensitive adhesive of the present invention, it is effective only for the addition reaction type pressure sensitive adhesive in order to balance the adhesion characteristics. Add and mix the cross-linking agent. The cross-linking agent effective for the addition reaction type silicone pressure-sensitive adhesive is not particularly limited. For example, X-92-122 manufactured by Shin-Etsu Chemical Co., Ltd., CR50 manufactured by Momentive Performance Materials, Toray Industries, Inc. -BY24-741 by Dow Corning Co., Ltd. is mentioned.

  The crosslinking agent effective for the addition reaction type silicone pressure-sensitive adhesive is preferably mixed in an amount of 0.12 parts by mass to 0.20 parts by mass with respect to 100 parts by mass of the mixture. If it is less than 0.12 parts by mass, the adhesive force of the pressure-sensitive adhesive becomes insufficient at the time of polymerization of the polymerizable monomer, and there is a possibility that the interval cannot be maintained. As a result, liquid leakage may occur from the cavity C due to expansion of the polymerizable monomer, and the resulting plastic lens may be chipped.

  On the other hand, if it exceeds 0.20 parts by mass, the adhesive force of the pressure-sensitive adhesive is too strong, so that the spacing is maintained even when the polymerizable monomer shrinks during polymerization of the polymerizable monomer. 100 is pulled toward the radial center of the mold 30. As a result, wrinkles are generated in the adhesive tape 100 for molding a plastic lens, and the lens wrinkles may enter the outer peripheral surface of the plastic lens.

  Next, although the material of the base material 10 is not specifically limited, the material which has a polyethylene terephthalate as a main component is optimal. However, the present invention is not limited to this, and other materials can be used.

  For example, a metal foil such as stainless steel or soft aluminum, or a resin film such as polybutylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, biaxially stretched polypropylene, polyimide, aramid, polycycloolefin, or fluorine resin can be used. A composite film obtained by laminating an aluminum foil and a resin film, or a composite film obtained by laminating a film formed by forming a metal oxide thin film such as alumina or silicon dioxide on the surface of the resin film and the resin film can also be used.

  When polyethylene terephthalate is used as the tape substrate 10, the thickness is preferably in the range of 20 μm to 75 μm. If it is less than 20 μm, since the rigidity of the substrate 10 is low, there is a possibility that the interval between the two molds 30, 30 cannot be maintained. In addition, the resin (polymerizable monomer) cannot resist the expanding force and cracks, cuts, etc., and air can enter the cavity C or the resin (polymerizable monomer) cannot resist the contracting force. It may shrink in the direction and cause tape wrinkles. On the other hand, when it exceeds 75 μm, the base material 10 has high rigidity, and thus the stretchability may be reduced. Further, a gap is generated in the wrap portion of the plastic lens molding pressure-sensitive adhesive tape 100, and there is a risk of leakage of resin (polymerizable monomer).

  As a manufacturing method of the adhesive tape 100 for molding a plastic lens, an addition reaction type silicone pressure sensitive adhesive and a peroxide curing type silicone pressure sensitive adhesive are dissolved in an organic solvent such as toluene and xylene, and an addition reaction type silicone pressure sensitive adhesive is used. An effective crosslinking agent is added to the substrate 10, and the solution is applied to the substrate 10 with a comma coater, a lip coater or the like so that the thickness of the pressure-sensitive adhesive layer 20 after drying is uniform. The method of hardening is mention | raise | lifted. You may provide an anchor process layer between the adhesion layer and the base material 10 as needed.

  However, the manufacturing method of the adhesive tape 100 for molding a plastic lens is not limited to the above method, and a normal manufacturing method adopted for forming a silicone pressure-sensitive adhesive layer on a substrate is as follows: Either can be adopted. If the temperature is set to an appropriate condition, the amount of low molecular weight siloxane can be reduced by heat treatment during drying / curing, but peroxide curing with treatment to reduce the amount of low molecular weight siloxane is performed. The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 20 may be manufactured by dissolving the type silicone pressure-sensitive adhesive in an organic solvent.

  The thickness of the adhesive layer 20 is usually in the range of 10 μm to 35 μm. When the thickness is less than 10 μm, the adhesive strength between the overlapping part of the plastic lens molding adhesive tapes 100 and the mold 30 becomes insufficient, and liquid leakage and air intrusion easily occur. On the other hand, if it exceeds 35 μm, the total thickness of the plastic lens molding pressure-sensitive adhesive tape 100 becomes too thick, and a gap is likely to be formed in the lap portion. Furthermore, the amount of low molecular weight substances (silanol and low molecular weight siloxane) eluted from the adhesive layer 20 is increased, and the plastic lens is prone to white turbidity and bubbles. In addition, the amount of low molecular weight siloxane is reduced. However, it is difficult to reduce the amount of low molecular weight siloxane.

  A plastic lens is manufactured using such an adhesive tape 100 for molding a plastic lens, but the shape and material of the mold 30 used at that time are not particularly limited. However, generally, a disk-shaped glass (silicon dioxide) or a metal is often used.

  Moreover, the kind of resin (polymerizable monomer) used as a raw material for the plastic lens is not particularly limited. In the case of spectacle lenses, conventionally known materials are used. For example, in the case of spectacle lenses having an ultrahigh refractive index (1.65 ≦ Ne), an episulfide resin (MR-174 manufactured by Mitsui Chemicals, Inc., Mitsubishi Gas). A monomer of IU-20 manufactured by Chemical Co., Ltd. or a thiourethane resin (MR-7 manufactured by Mitsui Chemicals, Inc.) 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), 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 (TRIVEX manufactured by PPG Industries), urethane methacrylate (MCR-10 manufactured by Mitsubishi Rayon Co., Ltd.), methacrylate (Kureha K.K.) -55), monomers such as allyl diglycol carbonate (CR-39 manufactured by PPG Industries), diallyl carbonate (CR-607 manufactured by PPG Industries), and polymethyl methacrylate (methyl polymethacrylate) can be used.

  The quantitative determination of the low molecular weight siloxane contained in the adhesive of the adhesive tape for molding a plastic lens of the present invention was performed by the following method using a GC-FID (gas chromatograph with a flame ionization detector). First, as a pretreatment of the sample, 0.25 g of the chopped adhesive tape sample was immersed in 10 mL of acetone (containing 20 μg / mL of n-tetradecane as an internal standard) and allowed to stand at room temperature for 24 hours after sealing.

  Next, the obtained immersion liquid was used as a test liquid, and quantitative measurement of low molecular weight siloxane was performed using a GC-FID (Gas Chromatograph with Hydrogen Flame Ionization Detector) apparatus Agilent Technologies 7890A. The column used was DB-5 manufactured by J & W (length 30 m, inner diameter 0.25 mm, film thickness 0.25 μm). The column temperature was maintained at 50 ° C. for 5 minutes, then heated to 300 ° C. at a temperature increase rate of 10 ° C./minute, and maintained at 300 ° C. for 60 minutes. The inlet temperature is 300 ° C., the detector temperature is 300 ° C., the carrier gas is He, the injection method is the pulsed splitless method, and the test solution injection amount is 1 μL.

  The amount of each low-molecular-weight siloxane of 3 to 20-mer contained in the pressure-sensitive adhesive containing the mixture as a main component was calculated by converting the peak area using n-tetradecane (n-C14) as a standard substance. At this time, the obtained result is the mass of the low molecular weight siloxane contained per 1 g of the pressure-sensitive adhesive having the mixture as a main component, the mass of the base material in the sample being reduced. The relative sensitivity of the low molecular weight siloxane to n-tetradecane was 2.62.

  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 for molding a plastic lens of the present invention is not limited to this.

[Example 1]
95 parts by mass of an addition reaction type silicone adhesive (SD-4560 manufactured by Toray Dow Corning Co., Ltd.), 5 parts by mass of a peroxide curing type silicone adhesive (KR-130 manufactured by Shin-Etsu Chemical Co., Ltd.), the addition reaction type 0.12 parts by mass of a crosslinking agent (X-92-122, manufactured by Shin-Etsu Chemical Co., Ltd.) effective for the silicone pressure-sensitive adhesive was uniformly stirred and mixed in toluene to prepare a pressure-sensitive adhesive solution. This pressure-sensitive adhesive solution was applied to a polyester (PET) film base material (thickness 50 μm) manufactured by Toray Industries, Inc. so that the thickness of the pressure-sensitive adhesive layer was 20 μm, and initially at 40 to 90 ° C. in the first half of the drying furnace. Dried. After that, it is dried for 1 minute in a zone where the maximum temperature of the heat treatment provided in the latter half of the drying furnace is 180 ° C., and a plastic lens molding adhesive tape having a total thickness of 70 μm (hereinafter sometimes referred to as an adhesive tape) Obtained.

  As shown in Table 1, the plastic lens produced using this adhesive tape is molded at a maximum temperature of 145 ° C. during polymerization of the polymerizable monomer. Further, the amount of low molecular weight siloxane is a pressure-sensitive adhesive whose main component is a mixture consisting of an addition reaction type silicone pressure sensitive adhesive and a peroxide curable silicone pressure sensitive adhesive (addition reaction type silicone pressure sensitive adhesive and excess siloxane). The pressure-sensitive adhesive comprising an oxide-curable silicone pressure-sensitive adhesive and a cross-linking agent) was less than 5 μg per g (less than the detection limit), and 3 to 20 mer was 3632 μg per g of the pressure-sensitive adhesive mainly composed of the mixture. Furthermore, the obtained plastic lens was a non-defective lens in which whitening (lens turbidity) and bubbles were not generated, liquid was not leaked, and polishing of the lens periphery and cutting of the lens surface were unnecessary. Therefore, it can be said that this adhesive tape has characteristics necessary for lens molding.

[Example 2]
80 parts by mass of an addition reaction type silicone pressure sensitive adhesive (TSR1512 manufactured by Momentive Performance Materials), 20 parts by mass of a peroxide curable type silicone pressure sensitive adhesive (SH4280PSA manufactured by Toray Dow Corning Co., Ltd.), A pressure-sensitive 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 a silicone pressure-sensitive adhesive. This pressure-sensitive adhesive solution was applied to 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, and initially dried at 40 to 90 ° C. in the first half of the drying furnace. . Then, it was dried for 3 minutes in a zone where the maximum temperature of the heat treatment provided in the latter half of the drying furnace was 180 ° C. to obtain an adhesive tape for molding plastic lenses having a total thickness of 44 μm.

  As shown in Table 1, the plastic lens produced using this adhesive tape is molded at a maximum temperature of 140 ° C. during polymerization of the polymerizable monomer. Further, the amount of low molecular weight siloxane is a pressure-sensitive adhesive whose main component is a mixture consisting of an addition reaction type silicone pressure sensitive adhesive and a peroxide curable silicone pressure sensitive adhesive (addition reaction type silicone pressure sensitive adhesive and excess siloxane). The pressure-sensitive adhesive comprising an oxide-curable silicone pressure-sensitive adhesive and a crosslinking agent) was 48 μg per 1 g, and the 3-20 mer was 4512 μg per 1 g of the pressure-sensitive adhesive mainly composed of the mixture. Furthermore, the obtained plastic lens was a non-defective lens in which whitening (lens turbidity) and bubbles were not generated, liquid was not leaked, and polishing of the lens periphery and cutting of the lens surface were unnecessary. Therefore, it can be said that this adhesive tape has characteristics necessary for lens molding.

Example 3
80 parts by mass of an addition reaction type silicone adhesive (SD-4560 manufactured by Toray Dow Corning Co., Ltd.), 20 parts by mass of a peroxide curing type silicone adhesive (SH4280PSA manufactured by Toray Dow Corning Co., Ltd.), the addition reaction type A pressure-sensitive adhesive solution was prepared by uniformly stirring and mixing 0.15 parts by mass of a cross-linking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) effective in toluene. This pressure-sensitive adhesive solution was applied to 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, and initially dried at 40 to 90 ° C. in the first half of the drying furnace. . Then, it was dried for 5 minutes in a zone where the maximum temperature of heat treatment provided in the latter half of the drying furnace was 130 ° C. to obtain an adhesive tape for molding plastic lenses having a total thickness of 44 μm.

  As shown in Table 1, the plastic lens produced using this adhesive tape is molded at a maximum temperature of 125 ° C. during polymerization of the polymerizable monomer. Further, the amount of low molecular weight siloxane is a pressure-sensitive adhesive whose main component is a mixture consisting of an addition reaction type silicone pressure sensitive adhesive and a peroxide curable silicone pressure sensitive adhesive (addition reaction type silicone pressure sensitive adhesive and excess siloxane). The pressure-sensitive adhesive comprising an oxide-curable silicone pressure-sensitive adhesive and a crosslinking agent) was 158 μg per gram, and 3 to 20 mer was 4432 μg per gram of the pressure-sensitive adhesive mainly composed of the mixture. Furthermore, the obtained plastic lens was a non-defective lens in which whitening (lens turbidity) and bubbles were not generated, liquid was not leaked, and polishing of the lens periphery and cutting of the lens surface were unnecessary. Therefore, it can be said that this adhesive tape has characteristics necessary for lens molding.

Example 4
80 parts by mass of an addition reaction type silicone adhesive (SD-4560 manufactured by Toray Dow Corning Co., Ltd.), 20 parts by mass of a peroxide curing type silicone adhesive (SH4280PSA manufactured by Toray Dow Corning Co., Ltd.), the addition reaction type A pressure-sensitive adhesive solution was prepared by uniformly stirring and mixing 0.15 parts by mass of a cross-linking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) effective in toluene. This pressure-sensitive adhesive solution was applied to 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, and initially dried at 40 to 90 ° C. in the first half of the drying furnace. . Then, it was dried for 5 minutes in a zone where the maximum temperature of heat treatment provided in the latter half of the drying furnace was 150 ° C. to obtain an adhesive tape for molding plastic lenses having a total thickness of 44 μm.

  As shown in Table 1, the plastic lens produced using this adhesive tape is molded at a maximum temperature of 120 ° C. during polymerization of the polymerizable monomer. Further, the amount of low molecular weight siloxane is a pressure-sensitive adhesive whose main component is a mixture consisting of an addition reaction type silicone pressure sensitive adhesive and a peroxide curable silicone pressure sensitive adhesive (addition reaction type silicone pressure sensitive adhesive and excess siloxane). The pressure-sensitive adhesive comprising an oxide-curable silicone pressure-sensitive adhesive and a crosslinking agent) was 97 μg per 1 g, and 3 to 20 mer was 3925 μg per 1 g of the pressure-sensitive adhesive mainly composed of the mixture. Furthermore, the obtained plastic lens was a non-defective lens in which whitening (lens turbidity) and bubbles were not generated, liquid was not leaked, and polishing of the lens periphery and cutting of the lens surface were unnecessary. Therefore, it can be said that this adhesive tape has characteristics necessary for lens molding.

Example 5
90 parts by mass of an addition reaction type silicone adhesive (SD4560 manufactured by Toray Dow Corning Co., Ltd.), 10 parts by mass of a peroxide curing type silicone adhesive (KR130 manufactured by Shin-Etsu Chemical Co., Ltd.), the above addition reaction type silicone adhesive A cross-linking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) effective for the agent was uniformly stirred and mixed in toluene to prepare an adhesive solution.

  This pressure-sensitive adhesive solution was applied to an aluminum / polyester film composite substrate (thickness 20 μm) manufactured by Aya Aluminum Co., Ltd. so that the thickness of the pressure-sensitive adhesive layer was 20 μm, and initially at 40 to 90 ° C. in the first half of the drying furnace. Dried. Then, it was dried for 3 minutes in a zone where the maximum temperature of the heat treatment provided in the latter half of the drying furnace was 150 ° C. to obtain an adhesive tape for molding plastic lenses having a total thickness of 40 μm.

  As shown in Table 1, the plastic lens produced using this adhesive tape is molded at a maximum temperature of 140 ° C. during polymerization of the polymerizable monomer. Further, the amount of low molecular weight siloxane is a pressure-sensitive adhesive whose main component is a mixture consisting of an addition reaction type silicone pressure sensitive adhesive and a peroxide curable silicone pressure sensitive adhesive (addition reaction type silicone pressure sensitive adhesive and excess siloxane). The pressure-sensitive adhesive comprising an oxide-curable silicone pressure-sensitive adhesive and a crosslinking agent) was 160 μg per gram, and 3 to 20 mer was 4790 μg per gram of the pressure-sensitive adhesive mainly composed of the mixture. Furthermore, the plastic lens obtained was partially whitened (lens turbidity) in the outer periphery during lens molding, but no bubbles were introduced, no liquid leaked, and the lens periphery was polished. I was able to obtain a good lens.

[Comparative Example 1]
96 parts by mass of an addition reaction type silicone adhesive (SD-4560 manufactured by Toray Dow Corning Co., Ltd.), 4 parts by mass of a peroxide curing type silicone adhesive (KR-130 manufactured by Shin-Etsu Chemical Co., Ltd.), the addition reaction type 0.10 parts by mass of a cross-linking agent (X-92-122 manufactured by Shin-Etsu Chemical Co., Ltd.) effective for silicone adhesives was uniformly stirred and mixed in toluene to prepare an adhesive solution.

  This pressure-sensitive adhesive solution was applied to a polyester (PET) film base material (thickness 50 μm) manufactured by Toray Industries, Inc. so that the thickness of the pressure-sensitive adhesive layer was 20 μm, and initially at 40 to 90 ° C. in the first half of the drying furnace. Dried. Then, it dried for 1 minute in the zone where the maximum temperature of the heat treatment provided in the latter half of the drying furnace was 180 ° C., to obtain an adhesive tape for molding plastic lenses having a total thickness of 70 μm.

  As shown in Table 1, the plastic lens produced using this adhesive tape is molded at a maximum temperature of 145 ° C. during polymerization of the polymerizable monomer. Further, the amount of low molecular weight siloxane is a pressure-sensitive adhesive whose main component is a mixture consisting of an addition reaction type silicone pressure sensitive adhesive and a peroxide curable silicone pressure sensitive adhesive (addition reaction type silicone pressure sensitive adhesive and excess siloxane). 40 μg per 1 g of an oxide-curable silicone pressure-sensitive adhesive and a crosslinking agent), and 3 to 20 mer was 3585 μg per 1 g of the pressure-sensitive adhesive mainly composed of the mixture. Furthermore, although the obtained plastic lens was not whitened (lens turbidity) and mixed with bubbles, the peripheral edge of the lens was chipped due to liquid leakage, and it could be used even when the peripheral edge of the lens was polished. I couldn't get the lens.

[Comparative Example 2]
78 parts by mass of an addition reaction type silicone adhesive (SD4560 manufactured by Toray Dow Corning Co., Ltd.), 22 parts by mass of a peroxide curing type silicone adhesive (KR101-10 manufactured by Shin-Etsu Chemical Co., Ltd.), 0.15 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 applied to a PET substrate (thickness 25 μm) manufactured by Toyobo Co., Ltd. so that the thickness of the pressure-sensitive adhesive layer was 20 μm, and was initially dried at 40 to 90 ° C. in the first half of the drying furnace. Then, it was dried for 1 minute in a zone where the maximum temperature of the heat treatment provided in the latter half of the drying furnace was 145 ° C. to obtain an 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 is molded at a maximum temperature of 160 ° C. during polymerization of the polymerizable monomer. Further, the amount of low molecular weight siloxane is a pressure-sensitive adhesive whose main component is a mixture consisting of an addition reaction type silicone pressure sensitive adhesive and a peroxide curable silicone pressure sensitive adhesive (addition reaction type silicone pressure sensitive adhesive and excess siloxane). The pressure-sensitive adhesive comprising an oxide-curable silicone pressure-sensitive adhesive and a crosslinking agent) was 235 μg per 1 g, and 3 to 20 mer was 5002 μg per 1 g of the pressure-sensitive adhesive mainly composed of the mixture. Further, the obtained plastic lens did not leak, but bubbles were seen in the lens molding, and whitening was seen in the entire lens, so that the lens could be used even if the lens periphery was polished. I didn't get to.

[Comparative Example 3]
100 parts by mass of an addition reaction type silicone adhesive (SD4560 manufactured by Toray Dow Corning Co., Ltd.), a cross-linking agent (X-92-122 manufactured by Shin-Etsu Chemical Co., Ltd.) effective for the addition reaction type silicone adhesive. 15 parts by mass was uniformly mixed with stirring to prepare an adhesive solution. This pressure-sensitive adhesive solution was applied to a Toyobo PET base material (thickness 25 μm) so that the thickness of the pressure-sensitive adhesive layer was 20 μm, and was initially dried at 40 to 90 ° C. in the first half of the drying furnace. Then, it was dried for 3 minutes in a zone where the maximum temperature of heat treatment provided in the latter half of the drying furnace was 130 ° C. to obtain an adhesive tape for molding plastic lenses having a total thickness of 45 μm.

  As shown in Table 1, the plastic lens produced using this adhesive tape is molded at a maximum temperature of 140 ° C. during polymerization of the polymerizable monomer. Further, the amount of low molecular weight siloxane is 697 μg, 3 to 20 in an amount of 3 to 10 mer per 1 g of an adhesive (adhesive comprising an addition reaction type silicone adhesive and a crosslinking agent) mainly composed of an addition reaction type silicone adhesive. The amount was 6253 μg per 1 g of the pressure-sensitive adhesive mainly composed of an addition reaction type silicone pressure-sensitive adhesive. Furthermore, in the obtained plastic lens, bubbles are observed in lens molding, whitening is observed in the entire lens, part of the lens peripheral edge due to liquid leakage also occurs, and the lens side surface is polished. It was not possible to obtain a lens with a usable level.

[Comparative Example 4]
96 parts by mass of addition reaction type silicone adhesive (SD-4560 manufactured by Toray Dow Corning Co., Ltd.), 4 parts by mass of peroxide curing type silicone adhesive (SH4280PSA manufactured by Toray Dow Corning Co., Ltd.), the addition reaction type A pressure-sensitive adhesive solution was prepared by uniformly stirring and mixing 0.25 parts by mass of a cross-linking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) effective in toluene. This pressure-sensitive adhesive solution was applied to 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, and initially dried at 40 to 90 ° C. in the first half of the drying furnace. . Then, it was dried for 3 minutes in a zone where the maximum temperature of the heat treatment provided in the latter half of the drying furnace was 120 ° C. to obtain an adhesive tape for molding a plastic lens having a total thickness of 44 μm.

  As shown in Table 1, the plastic lens produced using this adhesive tape is molded at a maximum temperature of 140 ° C. during polymerization of the polymerizable monomer. Further, the amount of low molecular weight siloxane is a pressure-sensitive adhesive whose main component is a mixture consisting of an addition reaction type silicone pressure sensitive adhesive and a peroxide curable silicone pressure sensitive adhesive (addition reaction type silicone pressure sensitive adhesive and excess siloxane). The pressure-sensitive adhesive comprising an oxide-curable silicone pressure-sensitive adhesive and a crosslinking agent) was 263 μg per 1 g, and 3 to 20 mer was 5446 μg per 1 g of the pressure-sensitive adhesive mainly composed of the mixture. Further, the obtained plastic lens cannot follow the thermal deformation (expansion and contraction) of the polymerizable monomer in lens molding, the lens outer peripheral portion is chipped and bubbles due to liquid leakage, and the liquid leakage from the opening Air containing moisture was mixed in, and as a result, whitening was observed in the entire lens, and even when the lens side surface was polished, a usable lens could not be obtained.

[Comparative Example 5]
78 parts by mass of an addition reaction type silicone adhesive (SD-4560 manufactured by Toray Dow Corning Co., Ltd.), 22 parts by mass of a peroxide curing type silicone adhesive (SH4280PSA manufactured by Toray Dow Corning Co., Ltd.), the addition reaction type 0.10 parts by mass of a cross-linking agent (BY24-741 manufactured by Toray Dow Corning Co., Ltd.) effective for silicone adhesives was uniformly stirred and mixed in toluene to prepare an adhesive solution. This pressure-sensitive adhesive solution was applied to 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, and initially dried at 40 to 90 ° C. in the first half of the drying furnace. . Then, it was dried for 3 minutes in a zone where the maximum temperature of the heat treatment provided in the latter half of the drying furnace was 180 ° C. to obtain an adhesive tape for molding plastic lenses having a total thickness of 44 μm.

  As shown in Table 1, the plastic lens produced using this adhesive tape is molded at a maximum temperature of 140 ° C. during polymerization of the polymerizable monomer. Further, the amount of low molecular weight siloxane is a pressure-sensitive adhesive whose main component is a mixture consisting of an addition reaction type silicone pressure sensitive adhesive and a peroxide curable silicone pressure sensitive adhesive (addition reaction type silicone pressure sensitive adhesive and excess siloxane). 49 μg per 1 g of an oxide-curable silicone pressure-sensitive adhesive and a crosslinking agent) and 3 to 20 mer were 4628 μg per 1 g of the pressure-sensitive adhesive mainly composed of the mixture. Furthermore, since the adhesive tape does not have a fixing force enough to seal the lens monomer in lens molding, the obtained plastic lens has chipped and bubbles in the outer periphery of the lens due to liquid leakage, and the liquid leakage opening As a result, whitening was observed in the entire lens, and even when the lens side surface was polished, a usable lens could not be obtained.

DESCRIPTION OF SYMBOLS 10 Base material 20 Adhesive layer 30 Mold 100 Plastic lens molding adhesive tape C Cavity

Claims (4)

Affixed to the outer peripheral edge of a pair of molds facing each other at a predetermined interval, sealing the opening of the space formed between the two molds, and forming a cavity filled with the polymerizable monomer of the plastic lens In the adhesive tape for molding plastic lenses used for
A tape-like base material, and an adhesive layer for adhering the base material to the mold, wherein the adhesive layer is 80 to 95% by mass of an addition reaction type silicone adhesive, and a peroxide-curing type silicone. A dimethylpolypropylene composed of an adhesive mainly composed of a mixture consisting of 5% by mass to 20% by mass of an adhesive and having a trimer and a 20-mer in the adhesive mainly composed of the mixture. The pressure-sensitive adhesive tape for plastic lens molding, wherein the siloxane content is 4850 μg or less per 1 g of the pressure-sensitive adhesive mainly composed of the mixture. Affixed to the outer peripheral edge of a pair of molds facing each other at a predetermined interval, sealing the opening of the space formed between the two molds, and forming a cavity filled with the polymerizable monomer of the plastic lens In the adhesive tape for molding plastic lenses used for
A tape-like base material, and an adhesive layer for adhering the base material to the mold, wherein the adhesive layer is 80 to 95% by mass of an addition reaction type silicone adhesive, and a peroxide-curing type silicone. A dimethylpolypropylene composed of a pressure-sensitive adhesive composed mainly of a mixture comprising 5% by mass to 20% by mass of the pressure-sensitive adhesive, and having a trimer to a 10-mer in the pressure-sensitive adhesive mainly composed of the mixture. The pressure-sensitive adhesive tape for molding a plastic lens, wherein the siloxane content is 165 μg or less per 1 g of the pressure-sensitive adhesive mainly composed of the mixture. Affixed to the outer peripheral edge of a pair of molds facing each other at a predetermined interval, sealing the opening of the space formed between the two molds, and forming a cavity filled with the polymerizable monomer of the plastic lens In the adhesive tape for molding plastic lenses used for
A tape-like base material, and an adhesive layer for adhering the base material to the mold, wherein the adhesive layer is 80 to 95% by mass of an addition reaction type silicone adhesive, and a peroxide-curing type silicone. A dimethylpolypropylene composed of a pressure-sensitive adhesive composed mainly of a mixture comprising 5% by mass to 20% by mass of the pressure-sensitive adhesive, and having a trimer to a 10-mer in the pressure-sensitive adhesive mainly composed of the mixture. The pressure-sensitive adhesive tape for molding a plastic lens, wherein the siloxane content is 50 μg or less per 1 g of the pressure-sensitive adhesive containing the mixture as a main component. A method for producing a plastic lens using the plastic lens molding adhesive tape according to any one of claims 1 to 3,
A pair of molds are arranged facing each other at a predetermined interval, and the adhesive tape for molding a plastic lens is attached to the outer peripheral edge of the two molds, and the opening of the space formed between the two molds is sealed, A cavity forming step for forming a cavity filled with a polymerizable monomer of a plastic lens;
A monomer filling step of filling the polymerizable monomer into the cavity;
A polymerization step of polymerizing the polymerizable monomer filled in the cavity;
A plastic lens molding method comprising:

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