KR101652145B1 - Adhesive tape for casting plastic lens and method for casting plastic lens - Google Patents

Abstract

[PROBLEMS] To provide a pressure-sensitive adhesive tape for plastic lens molding and a plastic lens molding method in which cloudiness and bubbles caused by an adhesive agent are not generated in a plastic lens.
[MEANS FOR SOLVING PROBLEMS] An adhesive tape (100) for plastic lens molding has a structure in which an adhesive layer (20) is formed on one side of a tape base material (10). The pressure-sensitive adhesive layer (20) contains, as a main component, a mixture of 80% by mass or more and 95% by mass or less of an addition reaction type silicone pressure-sensitive adhesive and 5% by mass or more and 20% by mass or less of a peroxide- And a pressure-sensitive adhesive made by mixing a cross-linking agent. The pressure-sensitive adhesive containing this mixture as a main component is heat treated so that the content of dimethylpolysiloxane having 3 or more and 20 or less is 4850 占 퐂 or less per 1 g of the pressure-sensitive adhesive containing the above mixture as a main component. The plastic lens is molded using the adhesive tape 100 for plastic lens molding and a pair of molds 30.

Description

TECHNICAL FIELD [0001] The present invention relates to an adhesive tape for molding a plastic lens,

INDUSTRIAL APPLICABILITY The present invention relates to a pressure-sensitive adhesive tape for plastic lens molding, which is used, for example, in producing a plastic lens such as a spectacle lens made of plastic having high refractive index or an optical lens, and a molding method for producing a plastic lens using the pressure- .

Conventional plastic lenses are molded by a casting polymerization method using a pair of glass molds (molds) and sealing adhesive tapes as disclosed in, for example, Patent Documents 1 and 2. That is, a conventional plastic lens is manufactured as follows. First, a pair of glass molds are arranged opposite to each other at a predetermined interval, and an adhesive tape for sealing is adhered along the circumferential direction around the entire periphery of the glass mold, so that the opening of the gap between the glass molds Is continuously sealed.

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

In such a conventional method of producing a plastic lens, a low molecular weight siloxane (mainly a 3- to 20-mer cyclic, straight-chain dimethylpolysiloxane) is eluted from the pressure-sensitive adhesive layer of a silicone- Resulting in the incorporation into the resin (polymerizable monomer). Since the low-molecular-weight siloxane and the resin (polymerizable monomer) are difficult to uniformly mix and have a sea-island shape, there is a possibility that white turbidity due to low molecular weight siloxane occurs in the inner and outer peripheral portions of the plastic lens after curing .

When the polymerizable monomer is, for example, a mixture of a polyisocyanate and a polythiol, the OH group of the silanol eluted from the pressure-sensitive adhesive layer during polymerization of the lens molding and the polymerization Since the NCO group of the polyisocyanate in the monomer is reacted to generate carbon dioxide, bubbles may be generated in the outer peripheral edge of the plastic lens after curing.

Patent Literatures 2 and 3 disclose techniques for suppressing the occurrence of cloudiness or air bubbles in the plastic lens as described above. However, according to this technique, when the occurrence of cloudiness or air bubbles due to the pressure-sensitive adhesive can not be sufficiently suppressed There is a need for further improvement.

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

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a pressure-sensitive adhesive tape for plastic lens molding which solves the problems of the prior art as described above and does not cause clouding and bubbles caused by the pressure- It is another object of the present invention to provide a molding method of a plastic lens in which cloudiness and bubbles are not generated due to a pressure-sensitive adhesive.

DISCLOSURE OF THE INVENTION The inventors of the present invention have conducted intensive studies to solve the above problems and found that a pressure sensitive adhesive comprising a mixture of an addition reaction type silicone pressure sensitive adhesive and a peroxide curable silicone pressure sensitive adhesive in a specific ratio is used as a main component, (Cyclic, straight-chain dimethylpolysiloxane having 3 to 20 carbon atoms) contained in the mixture is made up to 4850 占 퐂 per 1 g of the pressure-sensitive adhesive containing the above-mentioned mixture as a main component, silane from the pressure- It is possible to reduce the elution of the plastic lens of the plastic lens of the low molecular weight siloxane into the polymerizable monomer and to suppress the occurrence of cloudiness and bubble formation of the molding lens, The total amount of the siloxane (cyclic, straight-chain dimethylpolysiloxane of 3- to 10-dimers) When the pressure-sensitive adhesive to be equal to or less than 165㎍ per 1g of minutes, leading to the discovery of the ability to further suppress the white turbidity occurs and bubbles are generated in the molded lens, and devised the present invention.

The present invention has the following configuration. That is, the pressure-sensitive adhesive tape for plastic lens molding according to the present invention is adhered to the outer circumferential edge portions of a pair of molds opposed to each other with a predetermined gap therebetween to seal an opening of a space formed between the both molds, A pressure-sensitive adhesive tape for plastic lens molding, which is used for forming a cavity for filling a monomer, comprising a tape-like base material and an adhesive layer for adhering the base material to the mold, A pressure sensitive adhesive comprising a mixture of 80 mass% or more and 95 mass% or less of a reactive silicon pressure sensitive adhesive, and 5 mass% or more and 20 mass% or less of a peroxide curable silicone pressure sensitive adhesive as a main component, Dimethylpolysiloxane content of not less than 20 mer and not more than 4850 mu g per 1 g of a pressure-sensitive adhesive mainly composed of the above mixture It characterized.

The pressure-sensitive adhesive tape for plastic lens molding according to the present invention is adhered to the outer peripheral edge portions of a pair of molds opposed to each other with a predetermined gap therebetween to seal an opening of a space formed between the both molds, A pressure-sensitive adhesive tape for plastic lens molding, which is used for forming a cavity for filling a monomer, comprising a tape-like base material and an adhesive layer for adhering the base material to the mold, wherein the pressure- , 80% by mass or more and 95% by mass or less of a peroxide curable silicone pressure sensitive adhesive, and 5% by mass or more and 20% by mass or less of a peroxide curable silicone pressure sensitive adhesive as a main component. The dimethylpolysiloxane content is not more than 165 占 퐂 per gram of the pressure-sensitive adhesive containing the above mixture as a main component. It shall be.

The pressure-sensitive adhesive tape for plastic lens molding according to the present invention is adhered to the outer peripheral edge portions of a pair of molds opposed to each other with a predetermined gap therebetween to seal an opening of a space formed between the both molds, A pressure-sensitive adhesive tape for plastic lens molding, which is used for forming a cavity for filling a monomer, comprising a tape-like base material and an adhesive layer for adhering the base material to the mold, wherein the pressure- , 80% by mass or more and 95% by mass or less of a peroxide curable silicone pressure sensitive adhesive, and 5% by mass or more and 20% by mass or less of a peroxide curable silicone pressure sensitive adhesive as a main component. The dimethylpolysiloxane content is not more than 50 占 퐂 per gram of the pressure-sensitive adhesive containing the above mixture as the main component. It shall be.

The plastic lens forming method according to the present invention is a method for producing a plastic lens using the adhesive tape for plastic lens molding according to the present invention as described above, wherein a pair of molds are arranged opposite to each other at a predetermined interval, A cavity forming step of adhering the pressure-sensitive adhesive tape for plastic lens forming to outer peripheries of the two molds to seal an opening of a space formed between the both molds to form a cavity in which the polymerizable monomer of the plastic lens is filled; A monomer filling step of filling the polymerizable monomer in the cavity; and a polymerization step of polymerizing the polymerizable monomer charged in the cavity.

When the pressure-sensitive adhesive tape for plastic lens molding according to the present invention is used, cloudiness and bubbles caused by the pressure-sensitive adhesive are not generated in the plastic lens at the time of manufacturing the plastic lens. Further, according to the molding method of a plastic lens according to the present invention, cloudiness and bubbles caused by the pressure-sensitive adhesive do not occur in the plastic lens.

1 is a cross-sectional view showing the structure of one embodiment of a pressure-sensitive adhesive tape for plastic lens molding according to the present invention.
2 is a conceptual diagram for explaining an embodiment of a plastic lens molding method according to the present invention.
3 is a cross-sectional view showing the structure of another embodiment of the adhesive tape for plastic lens molding according to the present invention.
4 is an analysis chart of GC-FID (gas chromatography with hydrogen flame ionization detector) analysis of low molecular weight siloxane.

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

As shown in Fig. 1, the adhesive tape 100 for plastic lens molding according to the present embodiment is formed on substantially the entire surface of one side of a tape-like base material (hereinafter also referred to as a tape base material) And an adhesive layer 20 for adhering this to the molds 30 and 30 is formed.

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

First, as shown in Fig. 2, for example, after a pair of molds 30 and 30, which are substantially in a disk shape, are arranged to face each other with a predetermined space therebetween, The molding adhesive tape 100 is wound and adhered along the circumferential direction to continuously seal the openings of the space formed between the molds 30 and 30 while maintaining the gap. As a result, as shown in Fig. 2, the molds 30 and 30 are connected to each other in a substantially parallel manner, and a flat plate-shaped or cylindrical cavity C is defined therebetween (cavity forming step).

2, one end of the adhesive tape 100 for plastic lens molding is peeled off, a gap is opened, a nozzle (not shown) is inserted into the cavity C from the gap, . After injecting and filling a liquid resin (polymerizable monomer) into the cavity C from the nozzle, the gap is again closed with a plastic lens-forming adhesive tape 100 (monomer filling step).

As the resin (polymerizable monomer), a mixture of m-xylylene diisocyanate and pentaerythritol tetrakis mercaptopropionate or a mixture of m-xylylenediisocyanate and bis (mercaptoethyl) trithioglycerin And the like are used, but the present invention is not limited thereto.

Thereafter, a fixing jig (not shown) is mounted thereon, and the molds 30 and 30 are fixed so that the intervals do not vary. Since the molds 30 and 30 are fixed by the fixing jig, even if the internal pressure of the cavity C changes, the gap remains unchanged, and a constant gap is always maintained. Then, the resin (polymerizable monomer) in the cavity C is subjected to a polymerization reaction by heating or light irradiation, and is cured (polymerization step). After the resin (polymerizable monomer) has sufficiently cured, the plastic lens forming pressure sensitive adhesive tape 100 is completely peeled off and the molds 30 and 30 are removed, thereby obtaining a plastic lens.

In the pressure-sensitive adhesive tape 100 for plastic lens molding, the pressure-sensitive adhesive layer 20 is a mixture 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- , And a pressure-sensitive adhesive comprising a mixture of 0.12 parts by mass or more and 0.20 parts by mass or less of a crosslinking agent effective for the addition reaction-type silicone pressure-sensitive adhesive to 100 parts by mass of the mixture.

The resin (polymerizable monomer) is injected into the cavity C formed by the adhesive tape 100 for plastic lens molding and the pair of molds 30 and 30 because the adhesive layer 20 has a sufficient adhesive force , The resin (polymerizable monomer) can be surely sealed in the cavity C so that the resin (polymerizable monomer) is not leaked.

The peroxide curing type silicone pressure sensitive adhesive contains impurities such as silanol and low molecular weight siloxane (mainly, cyclic and / or linear dimethylpolysiloxane of 3 to 20 moles), but such impurities are eluted from the pressure sensitive adhesive layer 20, (Polymerizable monomer), there has been a possibility that the above-described clouding and bubbling may occur in the inside and the outer peripheral edge of the plastic lens after curing in the prior art.

However, the pressure-sensitive adhesive used in the pressure-sensitive adhesive tape 100 for plastic lens molding of the present embodiment is such that the ratio of the peroxide-curing silicone pressure-sensitive adhesive in the mixture of the addition reaction-type silicone pressure-sensitive adhesive and the peroxide- Firstly, the amount of silanol eluted is small. Therefore, air bubbles are not generated in the inner and outer peripheral edges of the plastic lens after curing.

Secondly, the pressure-sensitive adhesive to be used for the pressure-sensitive adhesive tape 100 for plastic lens molding of the present embodiment can be obtained by adjusting the content of the low molecular weight siloxane of the 3-to 20-mer in the pressure-sensitive adhesive to, for example, , And the amount of the low molecular weight siloxane (mainly cyclic and / or linear dimethylpolysiloxane having 3 to 20 moles) is significantly reduced because 4850 占 퐂 or less per gram of the pressure sensitive adhesive containing the above mixture as a main component. Therefore, no cloudiness occurs in the inner and outer peripheral edges of the plastic lens after curing.

The treatment for reducing the content of the low molecular weight siloxane in the pressure-sensitive adhesive used for the plastic lens-forming pressure-sensitive adhesive tape 100 of the present embodiment is preferably carried out on at least a peroxide curing type silicone pressure-sensitive adhesive among the peroxide- There is a need. The method of reducing the content of the low molecular weight siloxane in the peroxide curing type silicone pressure-sensitive adhesive is not particularly limited. However, the raw material of the peroxide-curing type silicone pressure-sensitive adhesive or the peroxide-curing type silicone pressure-sensitive adhesive is subjected to a heat treatment or a decompression treatment to volatilize the low molecular weight siloxane And then reducing it.

The amount of the low-molecular-weight siloxane is preferably in the range of 3 to 20 (in terms of Dn (n = 3 to 20 in Fig. 4) represents a n-valent siloxane of low molecular weight siloxane in the chart of quantitative analysis using the GC- The amount of dimethylpolysiloxane is preferably 4850 占 퐂 or less per gram of the pressure-sensitive adhesive containing the above mixture as a main component, preferably the amount of dimethylpolysiloxane having 3 to 10 monomers is 165 占 퐂 or less, more preferably, The amount is preferably 50 占 퐂 or less, that is, the amount by which the occurrence of clouding is sufficiently inhibited. The dimethylpolysiloxane may be cyclic or linear, and the amount of the dimethylpolysiloxane is the sum of the cyclic dimethylpolysiloxane and the straight-chain dimethylpolysiloxane.

Examples of the method of volatilizing and lowering the low molecular weight siloxane include (1) silicone gum or MQ (M unit: (CB ₃ ) ₃ SiO _1/2 , Q unit: SiO ₂ ) A method of reducing the resin by previously volatilizing the low molecular weight siloxane by high-temperature stirring or kneading (decompression strip) under reduced pressure at the stage of the raw material, (2) a step of mixing the silicone gum or MQ resin to produce the base pressure- (3) a method in which heat is applied in a coating and drying step of a silicone pressure sensitive adhesive solution to a substrate to form a low molecular weight siloxane And a method of performing the abatement treatment by volatilization from the adhesive layer. It is also possible to combine these processing methods. Considering productivity and cost, it is most preferable that the treatment method substantially corresponding to (3) is capable of widening the pressure-sensitive adhesive to the web shape and efficiently volatilizing the low molecular weight siloxane. By carrying out these treatments, the elution amount of the low molecular weight siloxane from the silicone pressure-sensitive adhesive can be reduced. Therefore, no cloudiness occurs in the inner and outer peripheral edges of the plastic lens after curing.

The temperature during the treatment for reducing the amount of the low-molecular-weight siloxane is not particularly limited, but the temperature at which the resin (polymerizable monomer) is polymerized at the time of lens molding, Heat treatment is preferred. By this heat treatment, the low molecular weight siloxane can be volatilized from the silicone pressure sensitive adhesive. The temperature of the heat treatment varies depending on the type of the resin (polymerizable monomer), but is preferably 130 ° C or higher, more preferably 150 ° C or higher, and even more preferably 180 ° C or higher. On the other hand, at a temperature exceeding 200 캜, the main chain (main chain) of the organopolysiloxane may be cut off and conversely the low molecular weight siloxane may be increased depending on the treatment time. In the treatment method of the above (3) The upper limit is preferably 200 占 폚.

The conditions other than the temperature at the time of the heat treatment such as the treatment time and the atmosphere (kind of atmosphere gas, air pressure, air velocity) are not particularly limited, The amount of the dimethylpolysiloxane having 20 to 80 g of the dimethylpolysiloxane per gram of the pressure sensitive adhesive having the above mixture as the main component is preferably 4850 占 퐂 or less, Preferably, the amount of dimethylpolysiloxane of 3- to 10-dimers is set to 50 占 퐂 or less per 1 g of the pressure-sensitive adhesive containing the above mixture as a main component, that is, the occurrence of clouding is sufficiently suppressed. When the present process is not carried out, the amount of the low-molecular-weight siloxane (dimethylpolysiloxane having 3 to 20 moles) becomes more than 4850 g per 1 g of the pressure-sensitive adhesive containing the above mixture as a main component.

The timing of performing the process for reducing the amount of the low molecular weight siloxane to the pressure sensitive adhesive is not particularly limited and may be applied to a single peroxide curable silicone pressure sensitive adhesive prior to mixing with the addition reaction type silicone pressure sensitive adhesive, It may be carried out in a mixture of the pressure-sensitive adhesive and a peroxide-curing silicone pressure-sensitive adhesive, or may be carried out after mixing the above-mentioned cross-linking agent into the mixture. That is, the above-mentioned treatment may be carried out at the stage of the raw material of the pressure-sensitive adhesive, or the above-mentioned treatment may be performed on the completed pressure-sensitive adhesive. The adhesive layer 20 may be formed by applying the pressure-sensitive adhesive solution onto the tape substrate 10, or may be subjected to the above-described treatment after the pressure-sensitive adhesive layer 20 is completed. Among them, the method of performing the heat treatment in a state in which the addition reaction type silicone pressure-sensitive adhesive is mixed with the peroxide-curing type silicone pressure-sensitive adhesive is more preferable because not only the peroxide curing type silicone pressure-sensitive adhesive but also the addition reaction type silicone pressure-sensitive adhesive lowers the low molecular weight siloxane.

As described above, when a plastic lens is manufactured using the adhesive tape 100 for plastic lens molding of the present embodiment, no clouding and bubbling are generated in the inner and outer peripheral portions of the plastic lens after curing, Can be manufactured.

In the present embodiment, the adhesive layer 20 is formed on the entire one surface (adhesive surface) of the tape base material 10. However, as shown in Fig. 3, the molds 30 and 30 of the tape base material 10, The adhesive layer 20 may be formed only on the region (both sides) to which the adhesive layer 20 is adhered. This configuration can reduce the amount of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 20 and can prevent the release of the pressure-sensitive adhesive in the low molecular weight siloxane or silanol monomer in the pressure-sensitive adhesive, There is no defect that it is attached.

The tape substrate 10, the pressure-sensitive adhesive layer 20, and the silicone pressure-sensitive adhesive, which are the raw materials of the pressure-sensitive adhesive, (that is, the addition reaction type silicone pressure- Silicone pressure-sensitive adhesive), and a crosslinking agent will be described in detail.

Examples of the addition reaction-type silicone pressure-sensitive adhesive include, but are not particularly limited to, KR3700, KR3701, X-40-3237-1, X-40-3240, Shin-Etsu Chemical Co., Ltd., Shinetsu Kogyo Kogyo Co., X-40-3291, X-40-3270, X-40-3270, X-40-3306, or Momentive Performance Materials TSR1512, TSR1516, XR37-B9204, SD4584, SD4585, SD4560, SD4570, SD4600PFC, and D4593 manufactured by BUSINESS CORPORATION.

The peroxide curing type silicone pressure-sensitive adhesive is not particularly limited, and examples thereof include KR100 and KR101-10 manufactured by Shin-Etsu Chemical Industry Co., Ltd., YR3340, YR3286, PSA610-SM manufactured by Momentive Performance Materials, XR37-B6722, and SH4280 manufactured by Toray Dow Corning Toray Co., Ltd.

The mixture of the addition reaction type silicone pressure-sensitive adhesive and the peroxide-curing type silicone pressure-sensitive adhesive comprises 80% by mass or more and 95% by mass or less of the addition reaction type silicone pressure-sensitive adhesive and 5% by mass or more and 20% by mass or less of the peroxide- (That is, the proportion of the addition reaction-type silicone pressure-sensitive adhesive is less than 80 mass%), the proportion of the peroxide-curing silicone pressure-sensitive adhesive is too large, so that the amount of the silanol or low molecular weight siloxane eluted increases , Bubbles and clouding tend to occur in the inside and the outer peripheral edge of the plastic lens.

On the other hand, if the proportion of the peroxide curable silicone adhesive is less than 5 mass% (that is, the proportion of the addition reaction type silicone adhesive exceeds 95 mass%), the adhesive strength of the adhesive layer 20 becomes insufficient, It is difficult to keep the gap between the molds 30 and 30 by the mold 100, and there is a fear that a notch on the periphery of the lens due to liquid leakage of the polymerizable monomer may occur. In addition, since the plastic lens and the molds 30 and 30 are easily scraped off, there is a need to polish the outer periphery of the plastic lens and to remove and clean the pool of the mold 30, There is a fear that the property may deteriorate. Particularly, in producing a high refractive index lens having a refractive index of 1.60 or more, since the polymerization temperature of the polymerizable monomer becomes a high temperature of 130 ° C or more, in order to impart the adhesive force to the adhesive layer 20 at such a high temperature, It is necessary to use at least 5 mass% of a curable silicone adhesive.

In addition, in a pressure-sensitive adhesive containing a mixture of an addition reaction-type silicon pressure-sensitive adhesive of the present invention and a peroxide-curing silicone pressure-sensitive adhesive as main components, a crosslinking agent effective only in the addition reaction-type pressure-sensitive adhesive is added and mixed in order to balance the adhesive properties. 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 Co., BY24-741 manufactured by Dow Corning Toray Co., Ltd.

The crosslinking agent effective for the addition reaction type silicone pressure-sensitive adhesive is preferably mixed in an amount of not less than 0.12 parts by mass and not more than 0.20 parts by mass based on 100 parts by mass of the mixture. If the amount is less than 0.12 parts by mass, the adhesive force of the pressure-sensitive adhesive may become insufficient at the time of polymerization of the polymerizable monomer, and the interval may not be maintained. As a result, liquid leakage from the cavity (C) occurs due to swelling of the polymerizable monomer, and there is a fear that a notch is generated in the obtained plastic lens.

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 gap is maintained even if the polymerizable monomer shrinks during polymerization of the polymerizable monomer, And is pulled toward the radial center side. As a result, wrinkles are generated in the adhesive tape 100 for plastic lens molding, and there is a possibility that lens wrinkles may enter the outer peripheral surface of the plastic lens.

Next, the material of the substrate 10 is not particularly limited, but a material mainly composed of polyethylene terephthalate is most suitable. However, the present invention is not limited to this, and other materials may 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 oriented polypropylene, polyimide, aramid, polycycloolefin, May be used. Further, a composite film obtained by laminating an aluminum foil and a resin film, or a composite film obtained by laminating a resin film with a thin film of a metal oxide such as alumina or silicon dioxide formed on the surface of the resin film may also be used.

When polyethylene terephthalate is used as the tape substrate 10, it is preferable that the thickness is within a range of 20 占 퐉 to 75 占 퐉. If the thickness is less than 20 mu m, the rigidity of the base material 10 is low, and there is a possibility that the gap between the two molds 30 and 30 can not be maintained. Further, cracks, cuts, and the like are generated because the resin (polymerizable monomer) is not able to resist the expansion force, so that air does not enter into the cavity C or the resin (polymerizable monomer) , Which may cause tape wrinkles. On the other hand, if it exceeds 75 탆, the rigidity of the base material 10 is high, and there is a possibility that the stretchability is lowered. Further, gaps may be generated in the wrap portion of the adhesive tape 100 for plastic lens molding, and liquid leakage of the resin (polymerizable monomer) may occur.

As a production method of the adhesive tape 100 for plastic lens molding, a crosslinking agent effective for an addition reaction type silicone pressure-sensitive adhesive is added to a pressure-sensitive adhesive solution obtained by dissolving an addition reaction type silicone pressure-sensitive adhesive and a peroxide curing type silicone pressure-sensitive adhesive in an organic solvent such as toluene, This solution is applied to the base material 10 by a comma coater or lip coater so that the thickness of the adhesive layer 20 after drying is uniform, and then dried and cured at a predetermined temperature. If necessary, an anchor treatment layer may be formed between the adhesive layer and the substrate 10.

However, the production method of the pressure-sensitive adhesive tape 100 for plastic lens molding is not limited to the above-described method, and any conventional production method adopted for forming the silicone pressure-sensitive adhesive layer on the substrate can be employed. If the temperature and the like are set at appropriate conditions, the amount of the low-molecular-weight siloxane can be reduced by heat treatment during drying and curing. However, a peroxide-curing silicone pressure- By dissolving it, the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 20 may be produced.

The thickness of the adhesive layer 20 is usually in the range of 10 mu m or more and 35 mu m or less. If it is less than 10 mu m, the adhesive strength between the overlapping portion of the adhesive tape 100 for plastic lens forming and the mold 30 becomes insufficient, and liquid leakage or air intrusion easily occurs. If the thickness exceeds 35 m, the total thickness of the adhesive tape 100 for plastic lens forming becomes too thick, and a gap is likely to be formed in the lap portion. Further, the elution amount of the low-molecular substance (silanol and low-molecular-weight siloxane) from the adhesive layer 20 also increases, and in addition to the occurrence of cloudiness and bubbles in the plastic lens, The amount of the low molecular weight siloxane is hardly reduced.

A plastic lens is produced using the adhesive tape 100 for plastic lens molding, but the shape, material, etc. of the mold 30 used at that time are not particularly limited. However, in general, a glass (silicon dioxide) material or a metal material having a disk shape is often used.

In addition, the kind of the resin (polymerizable monomer) used as the raw material of the plastic lens is not particularly limited. In the case of a spectacle lens, a conventionally known material is used. For example, in the case of a spectacle lens having an ultra-high refractive index (1.65 ≤ Ne), an episulfide-based resin (manufactured by Mitsui Kagaku Kogyo Co., MR-174, IU-20 manufactured by Mitsubishi Gas Chemical Co., Ltd.) or a monomer of a thiourethane resin (MR-7 manufactured by Mitsui Chemicals, Inc.).

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, Inc., MR-8 manufactured by Mitsui Kagaku Co., Ltd.) (TS-26 manufactured by Tokuyama Corporation), polycarbonate (Panlite manufactured by Teijin Chemicals Co., Ltd.), and the like. (K-23 manufactured by Kureha Kabushiki Kaisha), epoxy methacrylate (MCR-50 manufactured by Mitsubishi Rayon Co., Ltd.) in the case of a spectacle lens having a medium refractive index (1.55? Ne <1.58) , Dialkyl carbonate (HIRI manufactured by PPG Industries), and diallyl phthalate resin (NK-55 manufactured by Nihon Yuga Co., Ltd.).

In the case of a spectacle lens having a low refractive index (Ne &lt; 1.55), urethane resin (TRIVEX manufactured by PPG Industries), urethane methacrylate (MCR-10 manufactured by Mitsubishi Rayon Co., Ltd.), methacrylate Monomers such as allyl diglycol carbonate (CR-39 manufactured by PPG Industries), diallyl carbonate (CR-607 manufactured by PPG Industries), and polymethyl methacrylate (polymethyl methacrylate) Can be used.

Quantitative determination of the low molecular weight siloxane contained in the pressure-sensitive adhesive of the pressure-sensitive adhesive tape for plastic lens molding of the present invention was carried out by the following method using a GC-FID (gas chromatography with hydrogen flame ionization detector) apparatus. First, as a pretreatment of a sample, 0.25 g of a finely cut adhesive tape sample was immersed in 10 ml of acetone (containing 20 μg / ml of n-tetradecane as an internal standard), left at room temperature for 24 hours after sealing.

Subsequently, quantitative measurement of the low-molecular weight siloxane was carried out by using the obtained immersion liquid as the test solution and using 7890A manufactured by Agilent Technologies, GC-FID (gas chromatography with hydrogen flame ionization detector) apparatus. The used column is DB-5 (length 30 m, inner diameter 0.25 mm, film thickness 0.25 탆) manufactured by J & W. The column temperature was maintained at 50 占 폚 for 5 minutes, then elevated to 300 占 폚 at a heating rate of 10 占 폚 / minute, and maintained at 300 占 폚 for 60 minutes. The inlet temperature is 300 ° C, the detector temperature is 300 ° C, the carrier gas is He, the injection method is Pulsed Splitless method, and the injection amount of test liquid is 1 μl.

The amount of each low-molecular-weight siloxane of the 3-to 20-mer contained in the pressure-sensitive adhesive containing the above mixture as the main component was calculated on the basis of n-tetradecane (n-C14) At this time, the obtained result is the mass of the low-molecular-weight siloxane contained per 1 g of the mass of the pressure-sensitive adhesive containing the above-mentioned mixture as the main component, which reduced the mass of the base material in the sample. The relative sensitivity of the low molecular weight siloxane with n-tetradecane was 2.62.

[Example]

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

[Example 1]

, 5 parts by mass of a peroxide curing type silicone pressure sensitive adhesive (KR-130, manufactured by Shin-Etsu Chemical Co., Ltd.), 95 parts by mass of an addition reaction type silicone pressure sensitive adhesive (SD-4560 manufactured by Toray Dow Corning Toray Co., 0.12 parts by mass of a crosslinking agent (X-92-122, manufactured by Shin-Etsu Chemical Co., Ltd.), which is effective for the pressure-sensitive adhesive, was uniformly stirred and mixed in toluene to prepare a pressure-sensitive adhesive solution. This pressure-sensitive adhesive solution was coated on a polyester (PET) film substrate (thickness 50 탆) manufactured by Toray Industries, Inc., so that the thickness of the pressure-sensitive adhesive layer was 20 탆, and dried at 40-90 캜 in the first half of the drying furnace . Thereafter, the film was dried for one minute in a zone where the maximum temperature of the heat treatment provided in the second half of the drying furnace was 180 DEG C to obtain a plastic lens forming adhesive tape (hereinafter sometimes referred to as an adhesive tape) having a total thickness of 70 mu m .

As shown in Table 1, the plastic lens produced by using this pressure-sensitive adhesive tape is molded with a maximum temperature of 145 占 폚 during polymerization of the polymerizable monomer. The amount of the low molecular weight siloxane acid is preferably 1 g or more, more preferably 3 g to 10 g, in an amount of from 1 g to 10 g of a pressure sensitive adhesive (a pressure sensitive adhesive comprising an addition reaction type silicone pressure sensitive adhesive, a peroxide curable silicone pressure sensitive adhesive and a crosslinking agent) having a mixture of an addition reaction type silicone pressure sensitive adhesive and a peroxide curable silicone pressure sensitive adhesive (Less than the detection limit), and 3 to 20 moles per 1 g of the adhesive agent containing the above mixture as the main component. The obtained plastic lens was a good quality lens which did not cause whitening (clouding of the lens) and bubble inclusion, no liquid leakage, and did not need to polish the periphery of the lens or cut the lens surface. Therefore, it can be said that the adhesive tape has properties 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 Co., Ltd.), 20 parts by mass of a peroxide curing type silicone pressure-sensitive adhesive (SH4280 PSA manufactured by Toray Dow Corning Toray Co., 0.15 parts by mass of a cross-linking agent (BY24-741 available from Dow Corning Toray Co., Ltd.), which is effective for the pressure-sensitive adhesive, was uniformly stirred and mixed in toluene to prepare a pressure-sensitive adhesive solution. The pressure-sensitive adhesive solution was coated on a PET film base (thickness: 24 탆) made by Teijin DuPont Kabushiki Kaisha to have an adhesive layer thickness of 20 탆 and dried at a temperature of 40 to 90 캜 in the first half of the drying furnace. Thereafter, it was dried for 3 minutes in a zone where the maximum temperature of the heat treatment provided in the second half of the drying furnace was 180 占 폚 to obtain a pressure-sensitive adhesive tape for plastic lens molding with a total thickness of 44 占 퐉.

As shown in Table 1, the plastic lens produced by using this pressure-sensitive adhesive tape is molded at a maximum temperature of 140 占 폚 during polymerization of the polymerizable monomer. The amount of the low molecular weight siloxane acid is preferably 1 g or more, more preferably 3 g to 10 g, in an amount of from 1 g to 10 g of a pressure sensitive adhesive (a pressure sensitive adhesive comprising an addition reaction type silicone pressure sensitive adhesive, a peroxide curable silicone pressure sensitive adhesive and a crosslinking agent) having a mixture of an addition reaction type silicone pressure sensitive adhesive and a peroxide curable silicone pressure sensitive adhesive 48 [micro] g per 3 g to 20 g per g was 4512 g per 1 g of the pressure sensitive adhesive containing the above mixture as a main component. Further, the obtained plastic lens was a good quality lens which did not cause whitening (clouding of the lens) and bubble inclusion, no liquid leakage, and did not need to polish the periphery of the lens or cut the lens surface. Therefore, it can be said that the adhesive tape has properties necessary for lens molding.

[Example 3]

80 parts by mass of an addition reaction type silicone pressure-sensitive adhesive (SD-4560, manufactured by Toray Dow Corning), 20 parts by mass of a peroxide curing type silicone pressure-sensitive adhesive (SH4280 PSA manufactured by Toray Dow Corning Toray Co., 0.15 parts by mass of a crosslinking agent (BY24-741 available from Dow Corning Toray Co., Ltd.), which is effective for the silicone pressure-sensitive adhesive, was uniformly stirred and mixed in toluene to prepare a pressure-sensitive adhesive solution. The pressure-sensitive adhesive solution was coated on a PET film base (thickness 24 탆) manufactured by Teijin Dupont Co., Ltd., so that the thickness of the pressure-sensitive adhesive layer was 20 탆, and was dried at 40-90 캜 in the first half of the drying furnace. Thereafter, it was dried for 5 minutes in a zone where the maximum temperature of the heat treatment provided in the second half of the drying furnace was 130 캜 to obtain a plastic lens molding adhesive tape having a total thickness of 44 탆.

As shown in Table 1, the plastic lens produced by using this pressure-sensitive adhesive tape is molded with a maximum temperature of 125 占 폚 during polymerization of the polymerizable monomer. The amount of the low molecular weight siloxane acid is preferably 1 g or more, more preferably 3 g to 10 g, in an amount of from 1 g to 10 g of a pressure sensitive adhesive (a pressure sensitive adhesive comprising an addition reaction type silicone pressure sensitive adhesive, a peroxide curable silicone pressure sensitive adhesive and a crosslinking agent) having a mixture of an addition reaction type silicone pressure sensitive adhesive and a peroxide curable silicone pressure sensitive adhesive And 4432 g per 3 g of the pressure sensitive adhesive containing the above mixture as the main component. Further, the obtained plastic lens was a good quality lens which did not cause whitening (clouding of the lens) and bubble inclusion, no liquid leakage, and did not need to polish the periphery of the lens or cut the lens surface. Therefore, it can be said that the adhesive tape has properties necessary for lens molding.

[Example 4]

80 parts by mass of an addition reaction type silicone pressure-sensitive adhesive (SD-4560, manufactured by Toray Dow Corning), 20 parts by mass of a peroxide curing type silicone pressure-sensitive adhesive (SH4280 PSA manufactured by Toray Dow Corning Toray Co., 0.15 parts by mass of a crosslinking agent (BY24-741 available from Dow Corning Toray Co., Ltd.), which is effective for the silicone pressure-sensitive adhesive, was uniformly stirred and mixed in toluene to prepare a pressure-sensitive adhesive solution. The pressure-sensitive adhesive solution was coated on a PET film base (thickness: 24 탆) made by Teijin DuPont Kabushiki Kaisha to have an adhesive layer thickness of 20 탆 and dried at a temperature of 40 to 90 캜 in the first half of the drying furnace. Thereafter, it was dried for 5 minutes in a zone where the maximum temperature of the heat treatment provided in the second half of the drying furnace was 150 占 폚 to obtain a pressure-sensitive adhesive tape for plastic lens molding with a total thickness of 44 占 퐉.

As shown in Table 1, in the plastic lens produced by using the adhesive tape, the lens is molded at a maximum temperature of 120 占 폚 during polymerization of the polymerizable monomer. The amount of the low molecular weight siloxane acid is preferably 1 g or more, more preferably 3 g to 10 g, in an amount of from 1 g to 10 g of a pressure sensitive adhesive (a pressure sensitive adhesive comprising an addition reaction type silicone pressure sensitive adhesive, a peroxide curable silicone pressure sensitive adhesive and a crosslinking agent) having a mixture of an addition reaction type silicone pressure sensitive adhesive and a peroxide curable silicone pressure sensitive adhesive And 3,20 moles per gram of the pressure-sensitive adhesive containing the above mixture as the main component. Further, the obtained plastic lens was a good quality lens which did not cause whitening (clouding of the lens) and bubble inclusion, no liquid leakage, and did not need to polish the periphery of the lens or cut the lens surface. Therefore, it can be said that the adhesive tape has properties necessary for lens molding.

[Example 5]

, 90 parts by mass of an addition reaction type silicone pressure-sensitive adhesive (SD4560, manufactured by Toray-Dow Corning Incorporated), 10 parts by mass of a peroxide curing type silicone pressure sensitive adhesive (KR 130 manufactured by Shin-Etsu Chemical Co., And 0.20 parts by mass of a cross-linking agent (BY24-741 manufactured by Dow Corning Toray Co., Ltd.), which is effective for the pressure-sensitive adhesive, were uniformly stirred and mixed in toluene to prepare a pressure-sensitive adhesive solution.

This pressure-sensitive adhesive solution was coated on an aluminum / polyester film composite substrate (thickness 20 μm) manufactured by Asian Aluminum Co., Ltd. so that the thickness of the pressure-sensitive adhesive layer was 20 μm, and was dried at 40 to 90 ° C. in the first half of the drying furnace. Thereafter, it was dried for 3 minutes in a zone where the maximum temperature of the heat treatment provided in the second half of the drying furnace was 150 占 폚 to obtain a pressure-sensitive adhesive tape for plastic lens molding with a total thickness of 40 占 퐉.

As shown in Table 1, the plastic lens produced by using this pressure-sensitive adhesive tape is molded at a maximum temperature of 140 占 폚 during polymerization of the polymerizable monomer. The amount of the low molecular weight siloxane acid is preferably 1 g or more, more preferably 3 g to 10 g, in an amount of from 1 g to 10 g of a pressure sensitive adhesive (a pressure sensitive adhesive comprising an addition reaction type silicone pressure sensitive adhesive, a peroxide curable silicone pressure sensitive adhesive and a crosslinking agent) having a mixture of an addition reaction type silicone pressure sensitive adhesive and a peroxide curable silicone pressure sensitive adhesive And the amount of 3 to 20 moles per gram of the pressure-sensitive adhesive containing the above mixture as a main component was 4790 占 퐂. Further, in the obtained plastic lens, although some whiteness (clouding of the lens) was confirmed in the outer periphery in the lens molding, no good bubble was introduced, no liquid leakage was caused, and the periphery of the lens was polished.

[Comparative Example 1]

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

This pressure-sensitive adhesive solution was coated on a polyester (PET) film substrate (thickness 50 탆) manufactured by Toray Industries, Inc., so that the thickness of the pressure-sensitive adhesive layer was 20 탆, and dried at 40-90 캜 in the first half of the drying furnace . Thereafter, it was dried for one minute in a zone where the maximum temperature of the heat treatment provided in the second half of the drying furnace was 180 deg. C to obtain a pressure-sensitive adhesive tape for plastic lens molding with a total thickness of 70 mu m.

As shown in Table 1, the plastic lens produced by using this pressure-sensitive adhesive tape is molded with a maximum temperature of 145 占 폚 during polymerization of the polymerizable monomer. The amount of the low molecular weight siloxane acid is preferably 1 g or more, more preferably 3 g to 10 g, in an amount of from 1 g to 10 g of a pressure sensitive adhesive (a pressure sensitive adhesive comprising an addition reaction type silicone pressure sensitive adhesive, a peroxide curable silicone pressure sensitive adhesive and a crosslinking agent) having a mixture of an addition reaction type silicone pressure sensitive adhesive and a peroxide curable silicone pressure sensitive adhesive And 3 to 20 moles per gram of the pressure-sensitive adhesive containing the above mixture as the main component. The obtained plastic lens did not cause whitening (clouding of the lens) and air bubbles. However, even if the periphery of the lens was polished by the occurrence of a notch on the periphery of the lens due to liquid leakage, it was not possible to obtain a usable level of the lens.

[Comparative Example 2]

, 78 parts by mass of an addition reaction type silicone pressure-sensitive adhesive (SD4560, manufactured by Toei Dow Corning Toray Co., Ltd.), 22 parts by mass of a peroxide curing type silicone pressure-sensitive adhesive (KR101-10 available from Shin-Etsu Chemical Co., 0.15 parts by mass of a cross-linking 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.

The pressure-sensitive adhesive solution was coated on PET substrate (thickness 25 mu m) manufactured by Toyo Boseki Co., Ltd. so that the thickness of the pressure-sensitive adhesive layer became 20 mu m, And dried. Thereafter, the film was dried for one minute in a zone where the maximum temperature of the heat treatment provided in the second half of the drying furnace was 145 占 폚 to obtain a plastic lens molding adhesive tape having a total thickness of 45 占 퐉.

As shown in Table 1, the plastic lens produced by using this pressure-sensitive adhesive tape is molded with a maximum temperature of 160 占 폚 during polymerization of the polymerizable monomer. The amount of the low molecular weight siloxane acid is preferably 1 g or more, more preferably 3 g to 10 g, in an amount of from 1 g to 10 g of a pressure sensitive adhesive (a pressure sensitive adhesive comprising an addition reaction type silicone pressure sensitive adhesive, a peroxide curable silicone pressure sensitive adhesive and a crosslinking agent) having a mixture of an addition reaction type silicone pressure sensitive adhesive and a peroxide curable silicone pressure sensitive adhesive 235 占 퐂, and 3 to 20 mer were 5002 占 퐂 per 1g of the pressure-sensitive adhesive containing the above mixture as a main component. Further, the obtained plastic lens did not leak liquid, but bubbles were confirmed in lens molding, whitening was confirmed in the entire lens, and even if the periphery of the lens was polished, it was not possible to obtain a usable level of the lens.

[Comparative Example 3]

100 parts by mass of an addition reaction type silicone pressure-sensitive adhesive (SD4560, manufactured by Toa-Dow Corning Incorporated), 0.15 parts by mass of a cross-linking agent (X-92-122 manufactured by Shin-Etsu Chemical Co., Ltd.) Were uniformly stirred and mixed to prepare a pressure-sensitive adhesive solution. This pressure-sensitive adhesive solution was coated on a PET substrate (thickness: 25 탆), a product of Toyo Boscheki Co., Ltd., so that the thickness of the pressure-sensitive adhesive layer was 20 탆, and was dried at 40-90 캜 in the first half of the drying furnace. Thereafter, it was dried for 3 minutes in a zone where the maximum temperature of the heat treatment provided in the second half of the drying furnace was 130 占 폚 to obtain a pressure-sensitive adhesive tape for plastic lens molding having a total thickness of 45 占 퐉.

As shown in Table 1, the plastic lens produced by using this pressure-sensitive adhesive tape is molded at a maximum temperature of 140 占 폚 during polymerization of the polymerizable monomer. The amount of the low molecular weight siloxane was determined by adding 3 to 10 monomers in an amount of 697 g per 1 g of a pressure-sensitive adhesive containing an addition reaction-type silicone pressure-sensitive adhesive as a main component (pressure-sensitive adhesive comprising an addition reaction- It was 6253 g per 1 g of the pressure sensitive adhesive mainly composed of a silicone pressure sensitive adhesive. Further, in the obtained plastic lens, bubbles are confirmed in the lens molding, whitening is confirmed in the whole lens, and notches in the periphery of the lens due to some liquid leakage are also generated, It was too early to get a lens.

[Comparative Example 4]

, 96 parts by mass of an addition reaction type silicone pressure-sensitive adhesive (SD-4560, manufactured by Toei Dow Corning Japan), 4 parts by mass of a peroxide curing type silicone pressure sensitive adhesive (SH4280 PSA manufactured by Toray Dow Corning Toray Co., 0.25 parts by mass of a crosslinking agent (BY24-741 available from Dow Corning Toray Co., Ltd.), which is effective for the silicone pressure-sensitive adhesive, was uniformly mixed and stirred in toluene to prepare a pressure-sensitive adhesive solution. The pressure-sensitive adhesive solution was coated on a PET film base (thickness: 24 탆) made by Teijin DuPont Kabushiki Kaisha to have an adhesive layer thickness of 20 탆 and dried at a temperature of 40 to 90 캜 in the first half of the drying furnace. Thereafter, 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 set at 120 占 폚 to obtain a plastic lens molding adhesive tape having a total thickness of 44 占 퐉.

As shown in Table 1, the plastic lens produced by using this pressure-sensitive adhesive tape is molded at a maximum temperature of 140 占 폚 during polymerization of the polymerizable monomer. The amount of the low molecular weight siloxane acid is preferably 1 g or more, more preferably 3 g to 10 g, in an amount of from 1 g to 10 g of a pressure sensitive adhesive (a pressure sensitive adhesive comprising an addition reaction type silicone pressure sensitive adhesive, a peroxide curable silicone pressure sensitive adhesive and a crosslinking agent) having a mixture of an addition reaction type silicone pressure sensitive adhesive and a peroxide curable silicone pressure sensitive adhesive And 5446 占 퐂 / g of the adhesive mainly containing the above mixture. In addition, the obtained plastic lens can not follow the thermal deformation (expansion and contraction) of the polymerizable monomer in the lens molding, and notches and bubbles in the outer periphery of the lens due to liquid leakage are generated, and moisture Containing air was mixed, and as a result, whitening was observed throughout the lens, and even if the lens side was polished, it was not possible to obtain a usable level of the lens.

[Comparative Example 5]

, 78 parts by mass of an addition reaction type silicone pressure-sensitive adhesive (SD-4560, manufactured by Toray Dow Corning Japan), 22 parts by mass of a peroxide curing type silicone pressure sensitive adhesive (SH4280 PSA manufactured by Toray Dow Corning Toray Co., (BY24-741 available from Dow Corning Toray Co., Ltd.) as a crosslinking agent effective in silicone pressure-sensitive adhesives were uniformly mixed with stirring in toluene to prepare a pressure-sensitive adhesive solution. The pressure-sensitive adhesive solution was coated on a PET film base (thickness: 24 탆) made by Teijin DuPont Kabushiki Kaisha to have an adhesive layer thickness of 20 탆 and dried at a temperature of 40 to 90 캜 in the first half of the drying furnace. Thereafter, it was dried for 3 minutes in a zone where the maximum temperature of the heat treatment provided in the second half of the drying furnace was 180 占 폚 to obtain a pressure-sensitive adhesive tape for plastic lens molding with a total thickness of 44 占 퐉.

As shown in Table 1, the plastic lens produced by using this pressure-sensitive adhesive tape is molded at a maximum temperature of 140 占 폚 during polymerization of the polymerizable monomer. The amount of the low molecular weight siloxane acid is preferably 1 g or more, more preferably 3 g to 10 g, in an amount of from 1 g to 10 g of a pressure sensitive adhesive (a pressure sensitive adhesive comprising an addition reaction type silicone pressure sensitive adhesive, a peroxide curable silicone pressure sensitive adhesive and a crosslinking agent) having a mixture of an addition reaction type silicone pressure sensitive adhesive and a peroxide curable silicone pressure sensitive adhesive And 4628 g per 3 g of the pressure sensitive adhesive containing the above mixture as the main component. Further, since the pressure-sensitive adhesive tape does not have a fixing force enough to seal the lens monomer in lens molding, the obtained plastic lens has problems such that notches and bubbles in the outer periphery of the lens due to liquid leakage are generated and moisture Containing air was mixed, and as a result, whitening was observed throughout the lens, and even if the lens side was polished, it was not possible to obtain a usable level of the lens.

[Table 1]

10: substrate
20: Adhesive layer
30: Mold
100: Adhesive tape for plastic lens molding
C: cavity

Claims (4)

A plastic lens molding used for forming a cavity for filling the polymerizable monomer of the plastic lens by sealing the opening of the space formed between the both molds by being adhered to the outer periphery of a pair of molds opposed to each other with a predetermined gap therebetween, Sensitive adhesive tape,
And a pressure-sensitive adhesive layer for adhering the substrate to the mold, wherein the pressure-sensitive adhesive layer comprises 80% by mass or more and 95% by mass or less of the addition reaction type silicone pressure-sensitive adhesive, 5 mass parts of the peroxide- % Or more and 20 mass% or less, and the content of the dimethylpolysiloxane in the pressure-sensitive adhesive containing the mixture is not more than 4850 占 퐂 / g of the pressure-sensitive adhesive containing the mixture ; Wherein the content of the dimethylpolysiloxane in the pressure-sensitive adhesive containing the mixture is not more than 10 &lt; 6 &gt; per gram of the pressure-sensitive adhesive containing the mixture. delete The method according to claim 1,
A pressure-sensitive adhesive tape for plastic lens molding, characterized in that the content of dimethylpolysiloxane in the pressure-sensitive adhesive containing the mixture is not more than 50 占 퐂 per gram of the pressure-sensitive adhesive containing the mixture. A method of producing a plastic lens using the adhesive tape for plastic lens molding according to any one of claims 1 to 3,
A pair of molds are disposed opposite to each other with a predetermined space therebetween, and the plastic lens forming adhesive tape is adhered to the outer peripheral edge portions of both the molds to seal the openings of the space formed between the both molds, A cavity forming step of forming a cavity in which the monomer is filled,
A monomer filling step of filling the polymerizable monomer in the cavity;
And a polymerization step of polymerizing the polymerizable monomer charged in the cavity.

Images