JP6250458B2 - Curable adhesive resin composition and bonding method - Google Patents

Description

  The present invention relates to a curable adhesive resin composition having light shielding properties.

  In a lens unit such as a camera, a ghost is generated due to stray light from other than the effective lens diameter, resulting in quality degradation. In order to prevent this, a light shielding member or a light shielding paint is applied, or the structure of the lens barrel is eliminated. On the other hand, UV curable adhesives are sometimes used because of their ease of manufacture and productivity, but in general, cured products are limited to parts that are transparent and do not generate stray light. It was necessary to apply a shading paint. When internal reflection occurs in the lens, it is necessary to apply an internal reflection-preventing light-shielding paint. The process of applying the light-shielding coating not only reduces productivity, but also blocks the irradiation light path with an ultraviolet curable adhesive.

  The invention of Patent Document 1 has a refractive index in which the difference in refractive index between the photocurable resin and the refractive index of the cured product of the photocurable resin is 0.01 or more, with respect to the photocurable resin. A photo-curable resin composition containing a compound that is incompatible and dispersible, and is effectively cured by light, so that even a thick resin can be cured, and the resulting cured resin has low light transmittance Is disclosed. Although the lowest transmissivity disclosed as an example is 0.01% and deep-curing property is 1.002 mm, the container has an inner diameter of 6 mm and a depth of 15 mm, is actually narrow, and cannot be said to be sufficient in an environment with a small irradiation light path. In a thin film environment, there is a concern that the light shielding property is not sufficient.

  The invention of Patent Document 2 is a paint containing titanium dioxide, carbon black, a binder resin, a dispersant, and a solvent. Titanium dioxide has a methanol hydrophobization degree of 30 to 80% and a pH of 3.0 to 8.0. And 35 to 75% by mass in the solid content of the paint, and carbon black has a volatile content of 0.6 to 6.0% by mass, a pH of 3.0 to 8.0, and 2 to 20% by mass in the solid content of the paint. And a phthalocyanine compound and a polymer dispersant are used in combination as a dispersant, the phthalocyanine compound is contained in an amount of 1 to 20% by mass or less with respect to 100% by mass of carbon black, and the polymer dispersant has an amine value of 5 to 100 mgKOH / g. When the total amount of titanium dioxide and carbon black is 100% by mass, the content of 5 to 40% by mass is sufficient for the inner surface antireflection effect even for an optical element having a high refractive index. There are, and even if the long-term storage of the paint, discloses that the inner surface antireflection black paint for an optical element which can ensure coating operability.

  In the invention of Patent Document 3, the lens unit includes a first lens and a second lens made of a silicone resin that is good for ultraviolet transmission, and a barrel having a storage unit that stores the first lens and the second lens in a predetermined position. A UV curable UV adhesive that bonds the first and second lenses to the barrel, and the barrel is a wall surface of the storage unit and transmits ultraviolet light through the first and second lenses. It is disclosed that by providing a retracting part for retracting the UV adhesive 8 to the lens module, it becomes a lens module that suppresses defective resolution while improving manufacturing workability. Also, in the method in which the lens is bonded to the barrel with an adhesive, the adhesive penetrates into the gap between the lens and the barrel, resulting in insufficient curing, and the low molecular weight component of the UV curable adhesive is noticed in a sealed atmosphere. This indicates that the lens may cause chemical cracks or cloud the lens.

The invention of Patent Document 4 is formed in a cylindrical shape, a lens frame having a wide diameter portion having an upper end opening into which a lens can be inserted, and a lens frame protruding inward from the inner peripheral surface of the wide diameter portion of the lens frame. An edge receiving portion for positioning the lens inserted from the upper end opening of the wide diameter portion at a position of about 1/2 in the thickness direction of the edge surface in the direction perpendicular to the optical axis; An optical axis direction receiving portion for positioning in the optical axis direction a lens that is inserted from the upper end opening of the portion and positioned in a direction orthogonal to the optical axis by the edge receiving portion; and an inner peripheral surface of the wide diameter portion, Since the filling portion is formed between the edge receiving portion, distortion of the lens due to curing shrinkage of the adhesive can be reduced, and the lens can be fixed in a state of being maintained with high accuracy. In addition, a lens frame and a lens unit capable of improving manufacturing efficiency It has been disclosed.
When the adhesive is applied to the lens and the lens frame, if the adhesive is applied more than the volume of the gap (tapered portion) between the outer peripheral surface of the lens and the inner peripheral surface of the lens frame, the adhesive is removed from the gap. There is a problem of overflowing and adhering to the lens surface. When an adhesive adheres to the lens surface, a curing stress is generated on the lens surface as the adhered adhesive cures and shrinks. As a result, distortion occurs on the lens surface, and the lens surface accuracy is distorted. Therefore, it is necessary to remove the adhesive adhering to the lens surface, and there is a problem that the cleaning process after the lens adhesion is increased. Further, when the adhesive is filled to be smaller than the gap volume, a non-uniform space is generated in the gap, so that the curing stress of the adhesive acting on the outer peripheral surface of the lens becomes non-uniform, causing distortion in the lens. There was a problem. As described above, since it is necessary to assemble the lens and the lens frame after applying the adhesive, it is impossible to observe the filling amount of the adhesive in the gap after the assembly and the application state from the appearance, and work efficiency is improved. It states that there are problems such as bad problems.

The invention of Patent Document 5 is a method for adhering a lens incorporated in a lens barrel that adheres a first lens and a second lens outside the effective diameter of the light beam, between the first lens and the second lens. The light shielding member has a plurality of notches on the outer diameter side, and an adhesive for bonding the two lenses is applied to the notches. In the lens bonding method, the harmful light caused by the adhesive is cut, the adhesive strength is stabilized, and the positioning of the light shielding member and the flow of the adhesive into the lens can be prevented.
In the case of bonding lenses, there is a merit that the means for holding the lenses is not required and the lens holding method can be simplified, but it is difficult to provide an adhesive layer with a uniform thickness on the bonding surface between the lenses. The process management was difficult due to problems such as the protrusion of the adhesive to the inner diameter of the effective diameter of the lens and the protrusion of the lens to the body surface for fixing the lens. Further, in the case of the lens holding method by the adhesion, when the light shielding means is to be sandwiched between the adhesion surfaces of the lenses, the adhesion surface of one lens and one surface of the light shielding device, the other surface of the light shielding device and the other As in the case of the lens adhesion surface, two adhesion portions are necessary, and the above-described problem in the case of adhesion is disadvantageous as a further problem. Further, when the lens to be bonded is a plastic lens instead of glass, since the rigidity of the material is weak, deformation is likely to occur due to shrinkage when the adhesive is cured, which causes surface distortion in the light beam effective portion. Furthermore, it often deforms due to non-uniformity depending on the location of the amount of adhesive when applying the adhesive, and the desired optical performance is often not obtained. Further, as an adhesive often used for bonding optical components such as lenses, there is an ultraviolet curable resin. Unlike the volatile adhesive, the adhesive is characterized by a short curing time of several seconds, which is effective in shortening the bonding process time. However, plastic lenses are characterized by yellowing due to long-term or intense UV irradiation, so they may turn yellow due to strong UV light when curing the adhesive, which is one of the desired lens performances. There is a problem that the color balance changes. In addition, when the lens to be bonded is a thin lens, even if it is a glass lens instead of a plastic lens, the lens surface is liable to be deformed for the reasons described above, and attention is required. In addition, when adhering and bonding, if there is no allowance of a certain distance from the effective beam diameter of the lens to the adhesive application position in the outer diameter direction, the light flux passing near the effective beam diameter is reflected by the adhesive. The lens barrel is refracted and diffusely reflected, and is likely to cause problems such as ghost as a lens barrel. For this reason, conventionally, there are problems such as requiring a sufficient margin of the distance or a means for attaching a light shielding member for cutting off the harmful light after the lens is bonded in a separate process.

JP 2007-119684 A JP 2012-149197 A JP 2008-233271 A JP 2009-128680 A JP 2001-290063 A

  The problem to be solved is a curable adhesive resin composition that bonds and fixes a lens and a lens barrel, and the curable resin composition suppresses reflection on the inner surface of the lens and has a light shielding property. Disclosed is a curable adhesive resin composition that eliminates the fluidity of a resin composition and has adhesiveness between a lens and a lens barrel at room temperature or heat curing.

  The invention of claim 1 includes butadiene-terminated (meth) acrylate, monofunctional (meth) acrylate having a hydroxyalkyl group, alicyclic (meth) acrylate, long-chain hydrocarbon (meth) acrylate, carbon black, filler, heat A composition containing a polymerization initiator and an accelerator for promoting its decomposition, a photoinitiator, and a curable adhesive resin composition having a lens fixing and light-shielding property with a cured product having an elastic modulus of 1 to 20 MPa. It has the effect of eliminating fluidity, curing at room temperature or heating, suppressing light shielding and light reflection, and fixing the lens and the lens barrel at the same time.

  In the invention of claim 2, butadiene terminal (meth) acrylate is 39 to 47% by weight, monofunctional (meth) acrylate having a hydroxyalkyl group is 5 to 20% by weight, and alicyclic (meth) acrylate is 5 to 20% by weight. The curable adhesive resin composition according to claim 1, wherein the long-chain hydrocarbon-based (meth) acrylate is 5 to 20% by weight and the filler is 9 to 12% by weight. It has the effect of eliminating fluidity, curing at room temperature or heating, suppressing light shielding and light reflection, and fixing the lens and the lens barrel at the same time.

  The invention of claim 3 comprises the curable adhesive resin composition of claim 1 containing a curable adhesive resin composition containing a thermal polymerization initiator and not containing an accelerator that promotes decomposition, and an accelerator that promotes decomposition, An adhesive resin composition not containing a thermal polymerization initiator is put in a separate container, applied to an object to be coated from a needle through a static mixer at the time of application, and heated at room temperature or after light irradiation. With the bonding method, fixing of plastic lenses such as glass and COC resin, light shielding, light reflection prevention, and optical element inner surface reflection can be performed without blackening treatment.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the container is pressurized with gas, the needle or the object to be coated is moved by numerical control, the pressure is controlled according to the amount of movement, and the quantitative application is performed. With the described bonding method for optical elements, fixing of plastic lenses such as glass and COC resin, light shielding, light reflection prevention, and optical element inner surface reflection prevention can be performed without ink treatment, and a light shielding sheet or the like can be used. The degree of design freedom can be increased.

  The present invention suppresses movement due to light and vibration by light irradiation without causing abnormal aberration of the lens due to curing, and can simultaneously perform optical element, lens fixing and light shielding or inner surface reflection prevention of the optical element, It has the effect of omitting the shading treatment with the ink and the internal antireflection treatment.

FIG. 1 is a diagram illustrating an example of a portion where a curable adhesive resin composition is used.

  As shown in Patent Documents 3 to 5, optical elements, particularly lenses, are caused by defects caused by spherical aberration of the lens due to curing shrinkage, and light irradiation path is narrowed due to structural and internal reflection prevention and shading treatment. There is a problem with the optical device due to incomplete curing of the UV curable adhesive. If the strength of the cured product is allowed, the former problem can be solved by designing the resin composition with low elasticity. However, the low elasticity compounded composition is generally slow to cure, and there is a concern about the latter problem. Further, the ultraviolet irradiation adhesive, the light shielding treatment, and the inner surface antireflection treatment are incompatible with apparatuses requiring lightness, thinness, and smallness. Thermosetting resins often change before curing and can be used only within a limited range. In order to solve these problems, the present invention becomes a low-elasticity cured product that does not cause a problem in spherical aberration of the lens, and is a composition having excellent water resistance. The present inventors have found a composition capable of eliminating complete curing and preventing fluctuations that occur in thermosetting resins, resulting in the invention.

Butadiene-terminated (meth) acrylate main chain is polymerized by butadiene by living anion polymerization, and terminal hydroxyl group liquid polybutadiene containing 85% or more of 1,2-vinyl structure, or the former hydrogenated product with diisocyanate compound (meth) Acrylate, (meth) acrylate esterified with (meth) acrylic acid or 1,4-bonded main component, 1,4-cis about 20%, 1,4-trans about 60% , (Meth) acrylate obtained by esterifying hydroxyl-terminated liquid polybutadiene having about 20% 1,2-vinyl with (meth) acrylic acid. These are excellent in water resistance and flexibility of the cured product, and the former is preferable because it is easy to adjust the curability and coating viscosity. Commercially available products include NISSO-PB TE-2000 (Nippon Soda Co., Ltd., trade name, main chain 1,2-vinyl 85% or more product, terminal methacrylate product, acrylic equivalent (g / eq) 1100-2000), TEAI-1000. (Nippon Soda Co., Ltd., trade name, hydrogenated product, terminal acrylate product, acrylic equivalent (g / eq) 700-1200), EMA-3000 (Nippon Soda Co., Ltd., trade name, main chain 1,2-vinyl 90% or more product, number average molecular weight 2600-3700, terminal methacrylate product, number average molecular weight acrylic equivalent (g / eq) 1800-2500), BAC-45 (Osaka Organic Chemical Co., Ltd., trade name, polybutadiene-terminated diacrylate , About 10,000 molecular weight). Chemical formula 1 is the structural formula of previous TE-2000, chemical formula 2 is the structural formula of EMA-3000.

Monofunctional (meth) acrylate having a hydroxyalkyl group Monofunctional (meth) acrylate having a hydroxyalkyl group is 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate , 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 1,4-cyclohexanedimethanol mono (meth) acrylate, among which 4-hydroxybutyl ( Meth) acrylate and 2-hydroxybutyl (meth) acrylate are preferred because of excellent compatibility and adhesion.

Alicyclic (meth) acrylate Alicyclic (meth) acrylate is a (meth) acrylate monomer with an alicyclic ester group. Dicyclopentanyl, dicyclopentenyl, isobornyl, adamantanyl, tetrahydrofuranyl, cyclohexa Nyl group having dicyclopentenyl (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, dicyclopentanyl (meth) acrylate, isobornyl (meth) acrylate, adamantanyl (meth) Examples thereof include acrylate, tetrahydrofurfuryl (meth) acrylate, cyclohexyl (meth) acrylate, etc., and are excellent in viscosity reduction, compatibility, and curability. Of these, dicyclopentenyl (meth) acrylate is preferable in that it can impart flexibility.

Long-chain hydrocarbon (meth) acrylate Long-chain hydrocarbon (meth) acrylate monomers are those having 8 to 18 carbon atoms in the ester, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, isodecyl (Meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate and the like can be mentioned. Furthermore, it becomes useful because C10-12 contributes to the viscosity fall of a composition, sclerosis | hardenability, and the softness | flexibility of hardened | cured material.

Carbon black is a useful material that imparts light-shielding properties and may be used for general-purpose pigments, and is blended in an amount of 0.1 to 2.5% by weight based on the intended light-shielding properties. . If the amount is less than 0.1%, it is necessary to use it together with the black ink. If the amount exceeds 2.5% by weight, the general-purpose ultraviolet irradiation device will cause problems such as swelling before full curing even if the fluidity is lost. Produce.

A filler that can disperse in the resin component in the composition and impart concealability, such as filler talc, calcium carbonate powder, kaolin clay, mica powder, sericite, feldspar powder, cristobalite, and titanium dioxide is selected. Talc is preferred because it does not hinder deep curing of ultraviolet curing.

Ensuring storage stability of the two-part thermal polymerization initiator composition, high half-life temperature, easy redox reaction, compatible with butadiene-terminated (meth) acrylates and blended acrylates, and stored in the dark As a substitute test, even after 30 days at 40 ° C., the application method and purpose of the present application must be satisfied. Cumene hydroxy peroxide is preferred. 0.5 to 10% by weight is blended.

It is necessary to have a redox reaction with the redox accelerator thermal polymerization initiator and to have stability of the composition without reacting with an acrylic group, vinyl group, allyl group or the like, and copper naphthenate and cobalt naphthenate are preferable. Copper naphthenate contributes to the overall curability and cobalt naphthenate contributes to the surface curability, and the blending ratio is selected according to the purpose. Copper naphthenate and cobalt naphthenate are each blended in an amount of 0.1 to 5% by weight based on the total composition.

The photoinitiator may be a commonly used photopolymerization initiator that generates radicals by visible light or ultraviolet rays in accordance with the transmitted light of the lens, and ultraviolet rays having high energy are often used. It is preferable to blend 2 to 6% by weight with respect to the radically polymerizable component. As photoinitiator, 2-hydroxy-1- {4- [4- (2-hydroxy-2-methyl-propionyl) -benzyl] phenyl} -2-methyl-propan-1-one, 1-hydroxy-cyclohexyl- Phenyl-ketone, 4 ′-(2-hydroxyethoxy) -2-hydroxy-2-methylpropiophenone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one, phenyl Bis (2,4,6-trimethylbenzoyl) phosphine oxide and 2,4,6-trimethylbenzoyldiphenylphosphine oxide can be raised.
Of these, a combination of 1-hydroxy-cyclohexyl-phenyl-ketone and bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide is preferable in terms of deep curability.

The paint additive used for the other general purpose compound can be blended within a range not impairing the effects of the present invention. For example, a hindered phenol antioxidant, an alkoxysilane-containing vinyl monomer, a thixotropic agent, a viscosity modifier and the like can be added.

  The curable adhesive resin composition has a butadiene terminal (meth) acrylate of 39 to 47% by weight, a monofunctional (meth) acrylate having a hydroxyalkyl group of 5 to 20% by weight, an alicyclic (meth) acrylate of 5 to 20% by weight, and a long chain. The hydrocarbon-based (meth) acrylate is preferably 5 to 20% by weight, and the filler is preferably 9 to 12% by weight.

Use of the curable adhesive resin composition of the present application starts by mixing the A composition containing a thermal polymerization initiator and the B composition containing a redox accelerator. In general, a dispenser for controlling the amount of application by pressurizing a cartridge used for an ultraviolet curable adhesive and applying from a needle cannot be used. For this reason, the application to an optical element such as an actual lens is accommodated in a cartridge that can pressurize the A composition and the B composition separately with a gas such as nitrogen or air. The pressurization is a so-called NC in which the application amount and mixing ratio are controlled by a computer, and a device having an X axis, Y axis or third axis is attached to the object to be coated or the application side, and the site and application amount can be arbitrarily set. (Numerical) can be controlled. The cartridge is applied through a static mixer having a necessary number of stages at the outlets of A and B, connected to an application needle. The capacity and the number of stages of the static mixer are appropriately set according to the coating amount per unit time, the viscosity of the composition, and the viscosity.
The A composition and the B composition are preferably approximately one to one in terms of simplifying the apparatus and improving the mixing efficiency.
For example, between the lens barrel and the lens shown in FIG. 1, the O-ring temporarily fixing the lens and fixing on the lens barrel wall surface, and application fixing to the screw portion. After application, the curable adhesive resin composition is irradiated with light such as ultraviolet rays. Thus, the fluidity of the composition is eliminated and the composition is cured at room temperature or by heating. Since the resin composition has a light shielding property or a light reflection preventing property, it has a function of fixing light shielding and reflection preventing stray light from a camera or the like, and can be performed in one step.
The heating is performed at 80 ° C. or less at which the optical element does not deteriorate. By performing the heating, the curing time can be 10 minutes to 60 minutes.

  Examples will be described in detail below.

The following materials were used in the examples.
Butadiene-terminated (meth) acrylate: TE-2000 (Nippon Soda Co., Ltd., trade name)
Monofunctional (meth) acrylate having hydroxyalkyl group: Light ester HOB (N) (Kyoeisha Chemical Co., Ltd., trade name, 2-hydroxybutyl methacrylate)
Alicyclic (meth) acrylate: Fancryl FA-512M (Hitachi Chemical Co., Ltd., trade name, dicyclopentenyloxyethyl methacrylate)
Long-chain hydrocarbon (meth) acrylate: ISTA (Osaka Organic Chemical Industry Co., Ltd., trade name, isostearyl acrylate)
Carbon black: MA600 (Mitsubishi Chemical Corporation, trade name, particle diameter 20 nm (arithmetic mean diameter was determined by electron microscopic observation) nitrogen adsorption specific surface area 140 m ² / g DBP absorption 131 cm ^3/100 g)
Filler: SG-95 (Nippon Talc Co., Ltd., talc, particle size (D50) 2.5 μm)
Thermal polymerization initiator: Kayakumen H (Kayaku Akzo Co., Ltd., trade name, cumene hydroperoxide)
Photoinitiator: Irgacure 184 (BASF, trade name, 1-hydroxy-cyclohexyl-phenyl-ketone) and Irgacure 819 (BASF, trade name, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide) 4 Used by mixing at a weight ratio of 1: 1.
Accelerator: naphthex cobalt (Nippon Chemical Industry Co., Ltd., trade name, cobalt naphthenate, Co6% containing product and naphthex copper (Nippon Chemical Industry Co., Ltd., trade name, copper naphthenate, containing Cu 5%) 2 to 1 mixed use.
Thixotropic agent: CAB-O-SILR TS-610 (Cabot, trade name, fumed silica surface-treated with dimethyldichlorosilane having a low specific surface area)
Adhesion promoter: Sila Ace S710 (JNC Corporation, trade name, 3-methacryloxypropyltrimethoxysilane)
Stabilizer: Irganox 1010 (BASF, trade name, pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate) and dibutylhydroxytoluene mixed at a weight ratio of 1: 1 .

Curing time: At 23 ° C ± 2 ° C, apply a 1: 1 mixture of A and B of the SPCC steel plate 25x50mm2 degreased SPCC steel plate to make the uncoated part opposite. The uncoated part was pinched with a finger | toe and moved every 1 hour, and it was confirmed whether it was hardening. The notation indicates that it was uncured before and was cured after.
Deep part curability: 0.9 mm thick non-alkali glass plate with 5φ × 5 mm black nylon tube as weir, A and B are mixed in a one-to-one relationship, and filled with UV intensity of 200 mW / cm ² The film was irradiated for 10 seconds, 20 seconds, 30 seconds, and 60 seconds through the glass plate, and the cured film thickness was measured after irradiation. What the hardened | cured material of the composition adhered to glass was measured with the glass, and the thickness of the crow was deducted and it was set as the cured film thickness. The film thicknesses shown in Table 1 indicate the cured film thicknesses that have almost reached saturation and the time in parentheses is the time.
Young's modulus: After mixing the composition of Example sandwiched between release treatment alms polyethylene terephthalate film, a 500μm thick silicone sheet and spacers sandwiched further on both sides with glass plates, at irradiation intensity 300 mW / cm ² 6000 mJ / Cm ² is irradiated from above and below, and after 24 hours, a test specimen is prepared with a No. 8 dumbbell and measured according to JIS K6251 at a distance between gauge points of 33 mm and a tensile speed of 10 mm / min. From the part.
Curing shrinkage: JIS K6833-1: 2008 (adhesive-general test method), specific gravity cup method (metal specific gravity bottle) at 23 ° C ± 2 ° C, specific gravity of composition before curing, composition curing The specific gravity of the product was measured, and the cure shrinkage rate was measured according to the formula (1).
Pseudo-shrinkage stress: Calculated by the formula 2 (Unit: MPa)
In the formula, E is Young's modulus.

Table 2 was the same as Table 1, and A and B were mixed, but the display was described as a composition in which A and B were mixed.

Comparative Example 1
The same composition as in Example 1 was used except that the butadiene-terminated (meth) acrylate of Example 1 was changed to Art Resin UN-9200A (Negami Kogyo Co., Ltd., trade name, non-yellowing bifunctional urethane acrylate). After the accelerated storage test at 40 ° C. for 30 days, the compositions A and B of Comparative Example 1 reached a viscosity at which the composition A could not be mixed, and the composition B was skinned.
Even after 30 days at 40 ° C. of A and B of Examples 1 to 10, they could be mixed and applied with a dispenser.

The lens fixing adhesive can be used in the range of pseudo-shrinkage stress of 0.1 to 10 MPa, and the curable adhesive resin compositions of Examples 1 to 10 can be used as lens fixing with low stress.

DESCRIPTION OF SYMBOLS 1 Use part of curable adhesive resin composition 2 Example of use part of screw part of curable adhesive resin composition 3 Lens 4 Lens tube 5 O-ring packing 6 Board mounting body (part to be bonded and fixed to the board on which the image sensor is mounted)

Claims (4)

  Butadiene terminal (meth) acrylate, monofunctional (meth) acrylate having hydroxyalkyl group, alicyclic (meth) acrylate, long chain hydrocarbon (meth) acrylate, carbon black, filler, thermal polymerization initiator and decomposition thereof A curable adhesive resin composition having a lens fixing property and a light shielding property, which is a composition containing an accelerating accelerator and a photoinitiator, and has a cured product having an elastic modulus of 1 to 20 MPa.   Butadiene-terminated (meth) acrylate is 39 to 47% by weight, monofunctional (meth) acrylate having a hydroxyalkyl group is 5 to 20% by weight, alicyclic (meth) acrylate is 5 to 20% by weight, long-chain hydrocarbon type ( The curable adhesive resin composition according to claim 1, wherein the meth) acrylate is 5 to 20% by weight and the filler is 9 to 12% by weight.   The curable adhesive resin composition according to claim 1 includes a thermal polymerization initiator and does not include an accelerator that promotes decomposition, and an accelerator that accelerates decomposition and does not include a thermal polymerization initiator. An adhesive method comprising placing an adhesive resin composition in a separate container, applying the static resin through a static mixer, applying from a needle to an object to be coated, and then irradiating with light and then heating to room temperature or heating.   The method for adhering an optical element according to claim 3, wherein the container is pressurized with gas, the needle or the object to be coated is moved by numerical control, and the pressurization is controlled according to the amount of movement, and is applied quantitatively. .