JP2015074664A - Two-agent type curable polyorganosiloxane composition and use thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-agent type curable polyorganosiloxane composition having excellent quick curability.SOLUTION: There is provided a two-agent type curable polyorganosiloxane composition, which is a composition composed of a first component and a second component and comprises: (A) an alkenyl group-containing polyorganosiloxane containing two or more alkenyl groups in the molecule; (B) a polyorganohydrogensiloxane having two or more hydrogen atoms bonded to a silicon atom in the molecule; and (C) a platinum-based catalyst, where the ratio of the number of the hydrogen atom of (B) to the number of the alkenyl group of (A) is 0.5 to 100, (C) is 0.5 to 1000 wt.ppm in terms of a platinum group metal, the first group contains (C) and no (B) and the second group contains (A) and (B) and no (C). The two-agent type curable polyorganosiloxane composition is used for a construction method which comprises: a step of applying the first component to an adhered surface of one substrate; a step of applying the second component to an adhered surface of a substrate to which the first component is not applied; and a step of adhering the applied substrates to cure and bond.

Description

  The present invention relates to a curable polyorganosiloxane composition, and more particularly, to a two-part curable polyorganosiloxane composition having fast curability and a method for producing an adhesive using the same.

  In a display device such as a mobile phone provided with a display component such as a liquid crystal module, a glass or resin screen is installed on the front surface of the display device for the purpose of protecting the display device or improving design. However, since an air layer exists between the screen and the display device, there is a problem that it is difficult to see the display screen due to reflection of external light. Therefore, the air layer is bonded with a transparent adhesive that matches the refractive index of the screen. As an adhesive used therefor, an ultraviolet curable type is generally used. The adhesive is applied to one side of opposing members to be bonded, and the members are bonded together, and then cured with ultraviolet rays.

  In recent years, the use of plastic resin that is difficult to transmit ultraviolet rays to the screen material due to the variety of designs and the provision of frame printing with colored areas around the screen has increased the number of cases where ultraviolet rays do not transmit and are difficult to cure. It is coming. On the other hand, Patent Document 1 discloses that a compound having an average of at least one hydrolyzable silyl group in one molecule and an average of at least one polymerizable carbon-carbon double bond in one molecule. A curable composition containing the compound is disclosed. The composition described in Patent Document 1 is a curable composition that can be quickly cured by light and that is cured by reacting with moisture in the atmosphere even in a portion that is not exposed to light. Patent Document 2 discloses a two-component addition anti-silicone gel that cures by heating.

JP 2010-248347 A JP 2004-272059 A

  In the composition disclosed in Patent Document 1, since curing occurs in the coating apparatus, the problem of causing clogging of the coating apparatus and a long reaction time with moisture in the first place, the curing reaction after bonding is very slow. There was a problem.

  When the thermosetting composition disclosed in Patent Document 2 is interposed between the display device and the protective plate and thermally cured, there is a problem that the curing time is long and the protective plate is displaced. Although it is conceivable to cure the protective plate in a short time by applying a high temperature, there is a problem that sufficient heat cannot be applied for curing because of the heat resistance of the member to be bonded. .

  As described above, it is not necessary to use a special device such as radiation or a heating device in the curing reaction, and even a member that does not transmit ultraviolet rays or a member having poor heat resistance can be bonded, and it is not affected by the external environment such as moisture. Newly suitable for the bonding method in which the curing reaction is started when the adhesive components are contacted with each other by applying the adhesive to the substrates to be bonded to each other and bonding the substrates together. There is a growing need for new curable polyorganosiloxane compositions.

  An object of this invention is to provide the curable polyorganosiloxane composition excellent in quick-curing property.

The present invention
(A) an alkenyl group-containing polyorganosiloxane containing two or more alkenyl groups in the molecule;
(B) a polyorganohydrogensiloxane having two or more hydrogen atoms bonded to silicon atoms in the molecule; and (C) a platinum-based catalyst,
The ratio of the number H _B of hydrogen atoms bonded to the silicon atom in (B) to the number Vi _A of alkenyl groups in (A) is 0.5 to 100,
(C) is 0.5 to 1000 ppm by weight as a platinum group metal equivalent amount,
A composition comprising a first component and a second component,
The first component contains (C), does not contain (B),
The second component contains (A) and (B), does not contain (C),
The step of applying the first component to the adherend surface of one substrate, the step of applying the second component to the adherend surface of the substrate not coated with the first component, and bonding the coated substrate together It is an adhesive for bonding two substrates, including the steps of curing and bonding.
The present invention relates to a two-part curable polyorganosiloxane composition.

ADVANTAGE OF THE INVENTION According to this invention, the curable polyorganosiloxane composition excellent in rapid curability is provided.
Moreover, since this invention contains (C) which does not contain (B) which a 1st component is a catalyst, compared with the case where a 1st component or a 2nd component contains (B) with (C). The concentration of (C) in the first component and the viscosity of the first component itself can be easily adjusted by adding a substance that imparts appropriate wettability. A thin layer can be uniformly applied to the adherend surface of the substrate. In that case, the layer of the first component of the present invention exhibits good adhesion and uneven followability to the adherend surface of the substrate, and as a result, the cured product of the composition of the present invention has stronger adhesiveness. Can be demonstrated.
Furthermore, since the second component contains (A) and (B) in the present invention, compared to the case where the first component and the second component separately contain (A) and (B), respectively (A ) And (B) can be mixed more uniformly. In that case, since the composition of this invention is hardened | cured uniformly, the hardened | cured material can exhibit stronger adhesiveness.

The (A) alkenyl group-containing polyorganosiloxane of the present invention is a component that serves as a base polymer in the two-part curable polyorganosiloxane composition of the present invention. By blending (A), it is possible to ensure a stable three-dimensional structure by a crosslinking reaction during curing, to control and suppress curing shrinkage, and to ensure good visibility. (A) has an average of two or more alkenyl groups bonded to a silicon atom in one molecule, and can form a network structure by addition reaction with the Si—H bond in (B). Anything may be used. Typically, the general formula (I):
(R ^a ) _n1 (R ^b ) _n2 SiO _{(4-n1-n2) / 2} (I)
(Where
R ^a is independently a C ₂ -C ₆ alkenyl group (eg, vinyl, allyl, 3-butenyl, 5-hexenyl);
R ^b is independently a C ₁ -C ₆ alkyl group (eg, methyl, ethyl, propyl, butyl, pentyl, hexyl) or a phenyl group;
n1 is 1 or 2;
n2 is an integer of 0 to 2, provided that n1 + n2 is 1 to 3)
Is an alkenyl group-containing polyorganosiloxane having an average of at least two alkenyl group-containing siloxane units in the molecule. The average number of alkenyl groups in the molecule is preferably 2 to 100, more preferably 2 to 50.

  The siloxane skeleton of (A) may be linear or branched. Since the synthesis and control of the average degree of polymerization are easy, (A) is preferably a straight chain. Moreover, you may use these mixtures.

R ^a is preferably a vinyl group because it is easy to synthesize and does not impair the fluidity of the composition before curing and the heat resistance of the cured product. R ^a may be present at either the end or in the middle of the polyorganosiloxane molecular chain of (A), or may be present at both of them, in order to give excellent mechanical properties to the composition after curing. Is preferably present at least at both ends thereof.

^Rb is particularly preferably a methyl group because it is easy to synthesize and has an excellent balance of fluidity of the composition and mechanical strength after curing.

  n1 is preferably 1 because synthesis is easy.

  In (A), from the viewpoint of workability, the viscosity at 23 ° C is preferably 100 to 100,000 cP, more preferably 100 to 10,000 cP, and particularly preferably 300 to 4,000 cP. It is preferable to adjust the weight average molecular weight of (A) so as to be in these viscosity ranges. In addition, the viscosity in this invention is the value measured on the conditions of 23 degreeC using the rotational viscometer.

（式中、
Ｒ^ａは、独立して、Ｃ_２−Ｃ_６アルケニル基（例えば、ビニル、アリル、３−ブテニル、５−ヘキセニル、好ましくはビニル）であり、
Ｒ^ｂは、独立して、Ｃ_１−Ｃ_６アルキル基（例えば、メチル、エチル、プロピル、ブチル、ペンチル、ヘキシル、好ましくはメチル）又はフェニル基であり、
ｍ１は、（Ａ）の２３℃における粘度を１００〜１００，０００ｃＰ（好ましくは、１００〜１０，０００ｃＰ、より好ましく３００〜４，０００ｃＰ）にする数である）で示されるアルケニル基含有直鎖状ポリオルガノシロキサンが好ましい。 Therefore, as (A), the formula (Ia):

(Where
R ^a is independently a C ₂ -C ₆ alkenyl group (eg, vinyl, allyl, 3-butenyl, 5-hexenyl, preferably vinyl);
R ^b is independently a C ₁ -C ₆ alkyl group (eg, methyl, ethyl, propyl, butyl, pentyl, hexyl, preferably methyl) or a phenyl group;
m1 is an alkenyl group-containing straight chain represented by (A) having a viscosity at 23 ° C. of 100 to 100,000 cP (preferably 100 to 10,000 cP, more preferably 300 to 4,000 cP). Polyorganosiloxane is preferred.

  Furthermore, as (A), both ends are blocked with dimethylvinylsiloxane units, the intermediate unit is polymethylvinylsiloxane composed of dimethylsiloxane units, and the viscosity at 23 ° C. is 100 to 100,000 cP (preferably 100 An alkenyl group-containing linear polyorganosiloxane having a molecular weight of ˜10,000 cP, more preferably 300 to 4,000 cP is more preferred.

The polyorganohydrogensiloxane (B) of the present invention functions as a crosslinking agent (A) by the addition reaction of the hydrosilyl group contained in the molecule with the alkenyl group (A). is there. In order to reticulate the cured product, there is no particular limitation as long as it has an average of two or more hydrogen atoms bonded to silicon atoms involved in the addition reaction. Such polyorganohydrogensiloxane is typically represented by the general formula (II):
(R ^c ) _n3 (R ^d ) _n4 SiO _{(4-n3-n4) / 2} (II)
(Where
R ^c is a hydrogen atom,
R ^d is independently a C ₁ -C ₆ alkyl group (eg, methyl, ethyl, propyl, butyl, pentyl, hexyl, preferably methyl) or a phenyl group;
n3 is 1 or 2;
n4 is an integer of 0 to 2, provided that n3 + n4 is 1 to 3)
2 or more units in the molecule.

R ^d is exemplified by those similar to R ^b in (A) described above, including preferred ones. Further, n3 is preferably 1 because synthesis is easy.

  The siloxane skeleton in (B) may be linear, branched or cyclic, and is preferably linear or cyclic. Moreover, you may use these mixtures.

  (B) preferably has a viscosity at 23 ° C. of 1 to 10,000 cP, more preferably 1 to 1,000 cP, still more preferably 1 to 200 cP, and more preferably 1 to 50 cP. Particularly preferred.

When (B) is cyclic, (B1) R ^e ₂ HSiO _1/2 unit (wherein R ^e is independently a hydrogen atom or a C ₁ -C ₆ alkyl group (eg, methyl, ethyl, propyl, Butyl, pentyl, hexyl, preferably methyl) and SiO _4/2 units, and a cyclic polyorganohydrogensiloxane having two or more hydrogen atoms bonded to silicon atoms in one molecule.

(B1) is a cyclic polyorganohydrogensiloxane composed of R ^e ₂ HSiO _1/2 units and SiO _4/2 units and having two or more hydrogen atoms bonded to silicon atoms in one molecule. The number of hydrogen atoms in (B1) is preferably 3 to 100 and more preferably 3 to 50 in one molecule. R ^e as the C ₁ -C ₆ alkyl group is preferably methyl from the viewpoint of easiness of synthesis and the like.

As (B1), the ratio of R ^e ₂ HSiO _1/2 unit and SiO _4/2 unit is 1.5 to 2.2 mol of R ^e ₂ HSiO _1/2 unit with respect to 1 mol of SiO _4/2 unit. Is preferable, and 1.8 to 2.1 mol is more preferable. Typically, 3-5 SiO, such as [R ^e ₂ HSiO _1/2 ] ₈ [SiO _4/2 ] ₄ or [R ^e ₂ HSiO _1/2 ] ₁₀ [SiO _4/2 ] _{5 4/2} units form a cyclic siloxane skeleton, which each _{SiO 4/2} unit two ^R _e 2 _{HSiO 1/2} units combined is preferably, particularly preferably, the _{SiO 4/2} units Are bonded with _two (CH ₃ ) ₂ HSiO _1/2 units.

  The viscosity of (B1) is preferably 1 to 100 cP, and more preferably 1 to 50 cP.

When (B) is linear, both ends are independently blocked with R ₃ SiO _1/2 units, and the intermediate unit consists of R ₂ SiO _2/2 units (wherein R is independently A hydrogen atom, a C ₁ -C ₆ alkyl group (for example, methyl, ethyl, propyl, butyl, pentyl, hexyl, preferably methyl) or a phenyl group, Linear polyorganohydrogen having a viscosity at 23 ° C. of 1 to 10,000 cP (preferably 1 to 5,000 cP, more preferably 1 to 1,000 cP) at least two in the molecule are hydrogen atoms) Siloxane. The hydrogen atom bonded to the silicon atom may be present at the terminal or in the intermediate unit.

（式中、
Ｒ^ｃは、水素原子であり、
Ｒ^ｄは、独立して、Ｃ_１−Ｃ_６アルキル基（例えば、メチル、エチル、プロピル、ブチル、ペンチル、ヘキシル、好ましくはメチル）又はフェニル基であり、
ｍ２は、（Ｂ３）の２３℃における粘度を１〜１０，０００ｃＰ（好ましくは１〜５，０００ｃＰ、より好ましくは１〜１，０００ｃＰ）とする数である）で示される、直鎖状ポリオルガノハイドロジェンシロキサン；
（Ｂ３）両末端がＲ^ｄ _３ＳｉＯ_１／２単位で閉塞され、中間単位がＲ^ｃＲ^ｄＳｉＯ_２／２単位及びＲ^ｄ _２ＳｉＯ_２／２単位（式中、Ｒ^ｃは、水素原子であり、Ｒ^ｄは、独立して、Ｃ_１−Ｃ_６アルキル基（例えば、メチル、エチル、プロピル、ブチル、ペンチル、ヘキシル、好ましくはメチル）又はフェニル基である）からなり、２３℃における粘度が１〜１０，０００ｃＰ（好ましくは１〜５，０００ｃＰ、より好ましくは１〜１，０００ｃＰ）である、直鎖状ポリオルガノハイドロジェンシロキサン；及び
（Ｂ４）両末端がＲ^ｃＲ^ｄ _２ＳｉＯ_１／２単位で閉塞され、中間単位がＲ^ｃＲ^ｄＳｉＯ_２／２単位及びＲ^ｄ _２ＳｉＯ_２／２単位（式中、Ｒ^ｃは、水素原子であり、Ｒ^ｄは、独立して、Ｃ_１−Ｃ_６アルキル基（例えば、メチル、エチル、プロピル、ブチル、ペンチル、ヘキシル、好ましくはメチル）又はフェニル基である）からなり、２３℃における粘度が１〜１０，０００ｃＰ（好ましくは１〜５，０００ｃＰ、より好ましくは１〜１，０００ｃＰ）とする数である）である、直鎖状ポリオルガノハイドロジェンシロキサンが挙げられる。 For example, (B2) Formula (III):

(Where
R ^c is a hydrogen atom,
R ^d is independently a C ₁ -C ₆ alkyl group (eg, methyl, ethyl, propyl, butyl, pentyl, hexyl, preferably methyl) or a phenyl group;
m2 is a linear polyorgano represented by the viscosity of (B3) at 23 ° C. of 1 to 10,000 cP (preferably 1 to 5,000 cP, more preferably 1 to 1,000 cP). Hydrogen siloxane;
(B3) Both ends are blocked with R ^d ₃ SiO _1/2 units, intermediate units are R ^c R ^d SiO _2/2 units and R ^d ₂ SiO _2/2 units (wherein R ^c is a hydrogen atom) R ^d independently consists of a C ₁ -C ₆ alkyl group (eg, methyl, ethyl, propyl, butyl, pentyl, hexyl, preferably methyl) or a phenyl group, and has a viscosity at 23 ° C. A linear polyorganohydrogensiloxane that is 1 to 10,000 cP (preferably 1 to 5,000 cP, more preferably 1 to 1,000 cP); and (B4) both ends are R ^c R ^d ₂ SiO _{1 / 2} units are blocked and the intermediate units are R ^c R ^d SiO _2/2 units and R ^d ₂ SiO _2/2 units (wherein R ^c is a hydrogen atom and R ^d is independently C ₁ -C ₆ alkyl group For example, methyl, ethyl, propyl, butyl, pentyl, hexyl, preferably methyl) or a phenyl group) and a viscosity at 23 ° C. of 1 to 10,000 cP (preferably 1 to 5,000 cP, more preferably 1). A linear polyorganohydrogensiloxane, which is a number of ˜1,000 cP).

  (B2) is a linear polyorganohydrogensiloxane represented by the formula (III).

R ^d in (B2) is preferably a methyl group from the viewpoints of easy synthesis and excellent balance of properties such as mechanical strength and fluidity before curing.

  (B2) is preferably polymethylhydrogensiloxane in which both ends are blocked with dimethylhydrogensiloxane units and the intermediate unit is composed of dimethylsiloxane units.

  The viscosity of (B2) is 1 to 10,000 cP, more preferably 1 to 5,000 cP, and still more preferably 1 to 1,000 cP.

(B3) is a polyorganohydrogensiloxane in which both ends are blocked with R ^d ₃ SiO _1/2 units and the intermediate unit is composed of R ^c R ^d SiO _2/2 units and R ^d ₂ SiO _2/2 units. . R ^c in (B3) is preferably 2 to 5,000 in one molecule, more preferably 3 to 5,000, and still more preferably 20 to 1,000. R ^d in (B3) is preferably a methyl group from the viewpoint of easy synthesis and excellent balance of properties such as mechanical strength and fluidity before curing.

As (B3), the ratio of R ^c R ^d SiO _2/2 units to R ^d ₂ SiO _2/2 units is R ^c R ^d SiO _{2/2 with} respect to 1 mol of R ^d ₂ SiO _2/2 units. What a unit is 0.1-2.0 mol is preferable, and 0.5-1.5 mol is more preferable. Therefore, as (B3), both ends are blocked with trimethylsiloxane units, the intermediate unit is composed of a dimethylsiloxane unit and a methylhydrogensiloxane unit, and 0.1 mol of methylhydrogensiloxane unit per 1 mol of dimethylsiloxane unit. Polymethylhydrogensiloxane that is ˜2.0 mol is preferred.

  The viscosity of (B3) is 1 to 10,000 cP, more preferably 1 to 5,000 cP, and still more preferably 1 to 1,000 cP.

(B4) is a polyorganohydrogensiloxane in which both ends are blocked with R ^c R ^d ₂ SiO _1/2 units and the intermediate units are R ^c R ^d SiO _2/2 units and R ^d ₂ SiO _2/2 units. It is. R ^c in (B4) is preferably 2 to 5,000 in one molecule, more preferably 3 to 5,000, and still more preferably 3 to 1,000. R ^d in (B4) is preferably a methyl group from the viewpoint of easy synthesis and excellent balance of properties such as mechanical strength and fluidity before curing.

The ^(B4), the ratio of R ^c R _{d SiO 2/2} units and ^R _d 2 _{SiO 2/2} ^units, with respect to _R d _{2 SiO 2/2} units to 1 ^mol, R ^c R _{d SiO 2/2} What a unit is 0.1-2.0 mol is preferable, and 0.5-1.5 mol is more preferable. Therefore, as (B4), both ends are blocked with dimethylhydrogensiloxane units, the intermediate unit is composed of dimethylsiloxane units and methylhydrogensiloxane units, and the number of methylhydrogensiloxane units is 0 with respect to 1 mol of dimethylsiloxane units. A polymethylhydrogensiloxane that is .1 to 2.0 moles is preferred.

  The viscosity of (B4) is 1 to 10,000 cP, more preferably 1 to 5,000 cP, and still more preferably 1 to 1,000 cP.

(B) may be a branched polyorganohydrogensiloxane. For example, (B5) R ₂ HSiO _1/2 unit (wherein R is independently a hydrogen atom, C ₁ -C ₆ alkyl) Group (for example, methyl, ethyl, propyl, butyl, pentyl, hexyl, preferably methyl) or a phenyl group) and a SiO _4/2 unit, and three hydrogen atoms bonded to a silicon atom in one molecule The polyalkyl hydrogen siloxane which has the above is mentioned. Also, (B6) R ₃ SiO _1/2 unit, R ₂ SiO _2/2 unit and RSiO _3/2 unit (wherein R is independently a hydrogen atom, a C ₁ -C ₆ alkyl group (for example, And a polyalkylhydrogensiloxane having two or more hydrogen atoms bonded to a silicon atom in one molecule. The polyalkylhydrogensiloxane includes methyl, ethyl, propyl, butyl, pentyl, hexyl, preferably methyl) or a phenyl group. . The viscosity at 23 ° C. of the branched polyorganohydrogensiloxane is 1 to 10,000 cP, more preferably 1 to 5,000 cP, and still more preferably 1 to 1,000 cP.

(B) may be used alone or in combination of two or more. (B1), (B2), (B3), (B4), (B5), and (B6) can be used alone or in combination. From the viewpoint of increasing curability, it is preferable to use (B1). As (B), the combined use of (B1) and (B2), the combined use of (B1) and (B4), the combined use of (B3) and (B2) are preferable, and the combined use of (B1) and (B2) is more preferable. As (B), when (B1) and (B2) are used in combination, the amount of hydrogen in (B1) relative to the total amount of hydrogen in (B1) and (B2) (H _B1 / (H _B1 + H _B2 )) is preferably 0.05 to 0.60, more preferably 0.10 to 0.50.

From the viewpoint of ensuring proper cure rate, the ratio of the total number Vi _A of alkenyl groups bonded to silicon atoms, the total number H _B of the hydrogen atoms bonded to silicon atoms in (B) of (A) ( H _B / Vi _A ) is 0.5 to 100, preferably 0.5 to 50.

  (C) of the present invention is a catalyst for promoting the addition reaction between the alkenyl group of (A) and the Si—H group of (B). From the viewpoint of good catalytic activity, compounds of platinum group metal atoms such as platinum, rhodium and palladium are preferably used. Chloroplatinic acid, reaction products of chloroplatinic acid and alcohol, platinum-olefin complexes, platinum- Platinum compounds such as vinyl siloxane complexes, platinum-ketone complexes, platinum-phosphine complexes, rhodium-phosphine complexes, rhodium compounds such as rhodium-sulfide complexes, and palladium compounds such as palladium-phosphine complexes are preferred, and platinum compounds are more preferred. Preferably, a platinum-vinylsiloxane complex is more preferable.

  From the viewpoint of securing an appropriate curing rate, (C) is 0.5 to 1000 ppm by weight in terms of platinum group metal based on the total of (A) to (C), preferably 0.8. 5 to 500 ppm by weight. Moreover, from the viewpoint of ensuring the transparency of the resulting cured product, the platinum group metal equivalent is preferably 0.5 to 200 ppm by weight, more preferably 1 to 100 ppm by weight, and even more preferably 1 to 50 ppm by weight. It is.

  The composition of the present invention contains (D) a stabilizer having a nitrogen atom, (E) a diluent, (F) an adhesion-imparting agent, (G) an inorganic filler, and the like within a range not impairing the effects of the present invention. May be.

The composition of the present invention may contain (D) a stabilizer having a nitrogen atom. (D) can stabilize (C) the platinum-based catalyst. (D) is, for example, a general formula: (R ¹ ) ₂ N—R ³ —N (R ² ) ₂ (wherein R ¹ independently represents a C ₁ -C ₆ alkyl group (for example, Methyl, ethyl, propyl, butyl, pentyl, hexyl), R ² has the same meaning as R ¹ , or is a hydrogen atom, and R ³ is a C ₂ -C ₄ alkylene group (eg, ethylene, And an amine compound represented by the following formula:

  As (D), specifically, N, N, N ′, N′-tetramethylethylenediamine, N, N-dimethylethylenediamine, N, N-diethylethylenediamine, N, N-dibutylethylenediamine, N, N-dibutyl -1,3-propanediamine, N, N-dimethyl-1,3-propanediamine, N, N, N ′, N′-tetraethylethylenediamine, N, N-dibutyl-1,4-butanediamine, N, N, N ′, N′-tetramethylethylenediamine is preferred. (D) can be used individually or in mixture of 2 or more types.

  The blending amount of (D) is in the range of 0.001 to 0.5 mol, preferably 0.01 to 0.1 mol, with respect to 1 mol of the platinum group metal atom of (C). Within such a range, the appearance of the resulting catalyst can be prevented from poor appearance over time, discoloration can be suppressed, and curing in a desired time can be achieved without extremely reducing the catalytic activity of the platinum-based catalyst. .

  The composition of the present invention may contain (E) a diluent for the purpose of adjusting the viscosity. The siloxane skeleton in (E) may be linear, branched or cyclic, and is preferably linear or cyclic. For example, linear siloxanes such as hexamethyldisiloxane and cyclic siloxanes such as octamethylcyclotetrasiloxane are exemplified. (E) is a silicone oil that does not contain an alkenyl group involved in the curing reaction, and is preferably a polymethylsiloxane in which both ends are blocked with trimethylsiloxane units and an intermediate unit is composed of dimethylsiloxane units. (E) preferably has a viscosity at 23 ° C. of 1 to 1,000 cP, and more preferably 2 to 300 cP. The blending amount of (E) is preferably 50% by weight or less, more preferably 30% by weight or less, and more preferably 20% by weight of each component (first component and second component) in the composition of the present invention. More preferably, it is as follows.

  The composition of the present invention may contain (F) an adhesion-imparting agent. (F) As an adhesion promoter, alkoxysilanes such as 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropyl (methyl) dimethoxysilane Glycidoxypropyl group-containing alkoxysilanes; 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltriethoxysilane, 2- (3,4-epoxycyclohexyl) 2- (3,4-epoxycyclohexyl) ethyl group-containing alkoxysilanes such as ethyl (methyl) dimethoxysilane; vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, methylvinyldimethoxysilane, Allyltrimetoki Alkenylalkoxysilanes such as silane, allyltriethoxysilane, methylallyldimethoxysilane; 3-acryloxypropyltrimethoxysilane, 3-acryloxypropyltriethoxysilane, 3-acryloxypropyl (methyl) dimethoxysilane, 3- (Meth) acryloxypropylalkoxysilanes such as methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, 3-methacryloxypropyl (methyl) dimethoxysilane; and 1,1,3,5,7- A reaction product of pentamethylcyclotetrasiloxane and 3-methacryloxypropyltrimethoxysilane is exemplified.

（式中、Ｑ¹及びＱ²は、互いに独立して、直鎖状又は分岐状のアルキレン基、好ましくはＣ_１−Ｃ_４アルキレン基を表し；Ｒ³は、非置換又は置換された、アルキル基、好ましくはＣ_１−Ｃ_６アルキル基、より好ましくはＣ_１−Ｃ_４アルキル基を表す）で示される側鎖を有するアルコキシシラン類が好ましい。 Specifically, the following formula:

Wherein Q ¹ and Q ² independently of one another represent a linear or branched alkylene group, preferably a C ₁ -C ₄ alkylene group; R ³ is an unsubstituted or substituted alkyl group, preferably a _C 1 -C _6-alkyl group, alkoxysilanes are preferred having a side chain and more preferably represented by represents a _C 1 -C ₄ alkyl group).

In the side chain represented by the above formula, Q ¹ is exemplified by alkylene groups such as ethylene, trimethylene, 2-methylethylene, and tetramethylene, and is easy to synthesize and handle. Is preferred. Examples of Q ² include an alkylene group such as trimethylene, 2-methyltrimethylene, and tetramethylene, and a trimethylene group is preferable because synthesis and handling are easy. Examples of R ⁴ include alkyl groups such as methyl, ethyl, propyl, isopropyl, and butyl; and alkyl groups substituted with alkoxy such as 2-methoxyethyl, and alcohols that give good adhesion and are generated by hydrolysis Are easy to volatilize, a methyl group and an ethyl group are preferable, and a methyl group is particularly preferable.

Examples of such alkoxysilanes include the following compounds.

  As (F), in addition to the above alkoxylanes, aluminum alkoxides such as aluminum triethoxide, aluminum tripropoxide, and aluminum tributoxide; titanium tetraethoxide, titanium tetrapropoxide, titanium tetraisopropoxide, Titanium alkoxides such as titanium tetrabutoxide, titanium tetraisobutoxide, titanium tetraisopropenyl oxide; zirconium alkoxides such as zirconium tetraisopropoxide and zirconium tetrabutoxide; polar group-containing organics such as diallyl maleate and triallyl isocyanate Examples thereof include compounds.

  The composition of the present invention may contain (G) an inorganic filler. Examples of the inorganic filler (G) include dry fine powder silica such as fumed silica and arc silica, and fumed silica is preferable. In addition, such a silica surface is treated with a silazane compound such as hexamethyldisilazane, 1,3-divinyl-1,1,3,3-tetramethyldisilazane; a polyorganosiloxane such as octamethylcyclotetrasiloxane. Etc. may be processed.

  The composition of the present invention includes a first component and a second component, wherein the first component includes (C) and does not include (B), and the second component includes (A) and (B) (C ) Is not included. In this invention, each component contained in a 1st component and a 2nd component contacts only at the time of bonding a base material, and a crosslinking reaction advances. Therefore, the room temperature curable polyorganosiloxane composition of the present invention has excellent storage stability.

The first component of the present invention may contain only (C), but may contain other components other than (B) as long as the effects of the present invention are not impaired.
For example, it is preferable to blend a substance that imparts appropriate wettability to the first component from the viewpoint that uniform application to the adherend surface of the substrate can be easily performed. Examples of such wettability-providing substances include organic compounds and (A ′) organosilicon compounds containing 0 or more and less than 2 alkenyl groups in the molecule, preferably (A ′). . When a substance imparting such wettability is blended, it is advantageous in that coloring of the adherend surface of the substrate is suppressed. In the present invention, “containing 0 or more and less than 2 alkenyl groups in the molecule” means “does not contain an alkenyl group bonded to a silicon atom or contains an average of less than 2 in one molecule”. It means that.
Moreover, it is also preferable that a 1st component contains (D) from a viewpoint of stabilization of (C). Moreover, it is more preferable that a 1st component contains (D) and (E).
Further, the first component of the present invention may or may not contain (A), but preferably does not contain (A).

The organic compound is not particularly limited as long as it imparts appropriate wettability to the first component, but has low solubility, for example, low polarity, because it does not erode the adherend surface of the substrate. Hydrocarbon compounds such as aliphatic hydrocarbons such as hexane, hydrocarbon oils such as paraffin oil and polyolefins, aromatic hydrocarbons such as toluene and xylene; alcohols such as monohydric alcohols such as methanol and ethanol, ethylene glycol Glycols such as ethylene glycol monoethyl ether and the like, and alcohol, toluene, xylene and the like are preferable.
The compounding amount of the organic compound is not particularly limited as long as appropriate wettability can be imparted to the first component, but (C) is preferably 1 to 100,000 parts by weight with respect to 100 parts by weight, and 10 to 10,000 parts by weight. Part is more preferable, and 50 to 1,000 parts by weight is more preferable.

(A ′) is not particularly limited as long as it imparts appropriate wettability to the first component. (A′1) A silane compound containing 0 or more and less than 2 alkenyl groups in the molecule, (A′2) A siloxane compound containing 0 or more and less than 2 alkenyl groups in the molecule is exemplified.
Examples of the alkenyl group contained in (A ′) include C ₂ -C ₆ alkenyl groups such as vinyl, allyl, 3-butenyl and 5-hexenyl, preferably vinyl and allyl, more preferably Vinyl.

  Examples of (A′1) include conventional ones such as tetramethoxysilane, tetraethoxysilane, methyltrimethoxysilane, dimethyldimethoxysilane, phenyltrimethoxysilane, methyltriethoxysilane, dimethyldiethoxysilane, and phenyltriethoxysilane. Hexyltrimethoxysilane, hexyltriethoxysilane, decyltrimethoxysilane, trifluoropropyltrimethoxysilane, etc., preferably tetraethoxysilane.

In addition, (A′1) is preferably a functional group such as vinyltrimethoxysilane and vinyltriethoxysilane from the viewpoint of suppressing coloring of the adherend surface of the substrate and inhibiting the inhibition of curing of the first component and the second component. Silane coupling agent whose group is a vinyl group; 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycid Silane coupling agents whose functional groups such as xylpropylmethyldiethoxysilane and 3-glycidoxypropyltriethoxysilane are epoxy groups; Silane coupling agents whose functional groups such as p-styryltrimethoxysilane are styryl groups; 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltri Silane coupling agents in which the functional group such as methoxysilane, 3-methacryloxypropylmethyldiethoxysilane, and 3-methacryloxypropyltriethoxysilane is a methacryl group; functional groups such as 3-acryloxypropyltrimethoxysilane are acrylic groups And a silane coupling agent in which the functional group is an isocyanate group, such as 3-isocyanatopropyltriethoxysilane, and more preferably a silane coupling agent in which the functional group is a vinyl group.
More specifically, vinyltriethoxysilane is preferable.

The alkenyl group contained in (A′2) may be present at either the end or in the middle of the molecular chain, and is preferably present at one end.
In addition, (A′2) may contain a group other than an alkenyl group as a group bonded to a silicon atom, for example, an alkyl group or a phenyl group. Examples of the alkyl group, C ₁ -C ₆ alkyl, e.g., methyl, ethyl, propyl, butyl, pentyl, and hexyl, and a methyl group is preferable.
The siloxane skeleton of (A′2) may be linear, branched, or cyclic, and is particularly preferably linear or cyclic, particularly linear. Moreover, you may use these mixtures.
(A′2) preferably has a viscosity at 23 ° C. of 1 to 100,000 cP, more preferably 1 to 50,000 cP, and particularly preferably 2 to 10,000 cP. It is preferable to adjust the weight average molecular weight of (A′2) so as to be in these viscosity ranges.

  If the compound belonging to (E) and (F) defined above does not contain an alkenyl group bonded to a silicon atom or corresponds to an organosilicon compound containing an average of less than 2 in one molecule, the first As long as appropriate wettability is imparted to the component, it can be used as (A ′) defined above. Examples of (E) that can be preferably used as (A ′) include cyclic siloxanes such as octamethylcyclotetrasiloxane and linear siloxanes such as hexamethyldisiloxane. Examples of (F) that can be preferably used as (A ′) include those that are liquid at room temperature, such as titanium tetrabutoxide.

  The above-mentioned substances imparting wettability may be used alone or in combination of two or more.

  The first component of the present invention preferably has a viscosity at 23 ° C. of 1 to 100,000 cP, more preferably 1 to 10,000 cP, and particularly preferably 2 to 4,000 cP. In such a range, workability is improved, spreadability at the time of application is good, each component contained in the first component and the second component is easily mixed at the time of bonding, the reactivity is improved, and curing is performed. Time is further reduced.

  The second component of the present invention includes (A) and (B) and does not include (C), but preferably further includes (E).

  The second component of the present invention preferably has a viscosity at 23 ° C. of 100 to 100,000 cP, more preferably 100 to 50,000 cP, and particularly preferably 300 to 20,000 cP. In such a range, workability is improved, spreadability at the time of application is good, each component contained in the first component and the second component is easily mixed at the time of bonding, the reactivity is improved, and curing is performed. Time is further reduced. Further, in the addition reaction between (A) and (B), a large cross-linked structure is formed at a small number of reaction points, and this further shortens the curing time. It is preferable that an organosiloxane having a large molecular chain, that is, (A) having a high viscosity is present. From the viewpoint of obtaining such a second component, the second component has a high viscosity as (A) and (B) (for example, the viscosity at 23 ° C. is 30,000 to 100,000 cP) and the viscosity of the polyorganosiloxane. It contains a mixture of low polyorganosiloxanes (for example, the viscosity at 23 ° C. is 50 to 1,000 cP), or the second component is high in viscosity as (A) and (B) (for example, the viscosity at 23 ° C. is 30 , 1,000 to 100,000 cP) polyorganosiloxane, and (E) a diluent. Here, in the mixture of the polyorganosiloxane having a high viscosity and the polyorganosiloxane having a low viscosity, the amount of the polyorganosiloxane having a low viscosity is not particularly limited as long as the above viscosity is satisfied. It can be 30-60 weight part with respect to 30 weight part.

  The first component of the present invention can be prepared by uniformly kneading (C) and other components blended as necessary with a mixing means such as a universal kneader or a kneader. Further, the second component can be prepared in the same manner as the first component using (A), (B), and other components blended as necessary.

  After the first component and the second component are in contact with each other, the composition of the present invention is cured at room temperature (for example, 20 to 25 ° C.) and exhibits adhesive strength. That is, the composition of the present invention can be cured only by storing the first component and the second component as they are in different containers and contacting them at the time of use. The composition of the present invention can be cured in 0.1 to 30 minutes after the first component and the second component are in contact with each other, and can exhibit an adhesive force. The curing time is preferably from 0.1 to 20 minutes, and more preferably from 0.1 to 10 minutes. Moreover, the composition of this invention may heat at the temperature of 50-80 degreeC depending on the case after said hardening, may accelerate | stimulate hardening more, and may raise adhesive force more. Although heating time can be set suitably, it can be set as 0.1 minute-3 hours, for example.

  The composition of the present invention can have a transmittance after curing of 50 to 100%, preferably 70 to 100%, more preferably 80 to 100%. As described above, since the composition of the present invention has good transmittance after curing, the composition is visually recognized after curing between the base having the image display unit of the image display device and the translucent protective unit. It is also good in terms of sex.

  The composition of the present invention can be used as an adhesive for bonding various substrates. Specifically, the composition of the present invention is an adhesive for laminating two substrates, the step of applying the first component to the adherend surface of one substrate, and applying the first component. It can be used as an adhesive for bonding two substrates, including a step of applying the second component to a surface to be bonded of a substrate that is not bonded, and a step of bonding and curing and bonding the applied substrate. it can. The composition of the present invention is preferably an adhesive for bonding a base portion of an image display portion of an image display device such as a cathode ray tube, liquid crystal, plasma, organic EL or the like and a translucent protective portion. Moreover, it is preferable that the 1st component of this invention is apply | coated to the base of the said image display part, and the 2nd component of this invention is apply | coated to the said protection part from the point from which favorable adhesiveness is acquired.

  The manufacturing method of the adhesive body containing two base materials using the two component type curable polyorganosiloxane composition containing the 1st component and 2nd component of this invention is attached to the to-be-adhered surface of one base material. It includes a step of applying one component, a step of applying the second component to the adherend surface of the base material to which the first component is not applied, and a step of bonding and curing and bonding the applied base material.

  Base materials include metals such as aluminum, iron, zinc, copper, magnesium alloys, epoxy resins, acrylic resins, plastics such as ABS, PA, PBT, PC, PPS, SPS, and glass, cathode ray tubes, liquid crystals, plasma The base of the image display unit of the image display device such as organic EL and the light-transmitting protective unit are preferable.

  Although the usage-amount of the 1st component or 2nd component apply | coated to a base material is not specifically limited, For example, a 2nd component is 200-100,000 weight part with respect to 100 weight part of 1st components. It is preferably 200 to 50,000 parts by weight, more preferably 200 to 10,000 parts by weight, and particularly preferably 200 to 5,000 parts by weight.

The coating thickness of the first component is not particularly limited. However, when the first component is applied relatively thinly, it can follow the curved surface, unevenness, cracks, deflection, etc. on the adherend surface of the substrate well and form a uniform layer with a flat surface. . Such a first component layer comes into contact with the second component layer and cures, whereby good adhesion is obtained. From such a point, the coating thickness of the first component is preferably 0.1 to 50 μm, more preferably 0.1 to 40 μm, and further preferably 0.1 to 30 μm.
On the other hand, the coating thickness of the second component is not particularly limited, but is preferably 10 to 1,000 μm, and more preferably 100 to 500 μm.

  The application method to the substrate is not particularly limited as long as it can be applied accurately to the position of the target surface to be bonded and the entire adhesive body can be filled with an adhesive, and examples include a method using a dispenser and a slot die coater. It is done.

  The bonding method is not particularly limited, and examples thereof include a method of bonding under vacuum and a method of bonding under atmospheric pressure.

  In the present invention, a step of heating at a temperature of 50 to 80 ° C. may optionally be included after the step of bonding, curing and adhering the coated base material. Thereby, hardening is accelerated | stimulated more and adhesive force becomes higher.

  In the present invention, the composition of the present invention is used as a part of the adherend surface, and the remaining part is an adhesive having a composition different from that of the composition (for example, a one-component polyorganosiloxane composition having low reactivity) An adhesive body may be manufactured using an adhesive). From the viewpoint of uniformity of properties such as optical properties and adhesiveness of the obtained cured product, (A) and (B) included in the composition of the present invention are included in an adhesive having a different composition from this composition. In the alkenyl group-containing polyorganosiloxane and polyorganohydrogensiloxane, the former (A) and the latter alkenyl group-containing polyorganosiloxane are the same, and the former (B) and the latter polyorganohydrogensiloxane are the same. Preferably there is.

  Therefore, the manufacturing method of the adhesive body containing two base materials which is a preferable embodiment of the present invention is an image using a two-part curable polyorganosiloxane composition containing the first component and the second component of the present invention. A method for manufacturing an image display device including a base portion of a display device and a translucent protective portion, the step of applying a first component or a second component to the adherend surface of the base portion of the image display portion of the image display device, Applying the second component or the first component (but different from the component applied to the adherend surface of the base of the image display portion of the image display device) to the adherend surface of the translucent protection portion; A step of bonding the base portion of the image display portion of the image display device and the translucent protective portion together and curing and bonding them. In addition, you may provide the level | step difference for preventing the outflow of a composition in an outer peripheral edge part as needed in the base of an image display part.

  As the image display device obtained by the composition of the present invention or the production method of the present invention, specifically, the image display device is a large (50 to 100 inch) plasma panel display or the like, or the image display device is small (1 to 1). Mobile phones of less than 50 inches). Further, these image display devices may include a touch sensor.

  Next, an Example and a comparative example are given and this invention is demonstrated further in detail. However, the present invention is not limited to these examples.

  In the composition shown in Table 1, each component was kneaded by hand mixing to prepare a two-component composition containing the first component and the second component of Examples and Comparative Examples.

Each component used is as follows.
A-1: Polymethylvinylsiloxane having both ends blocked with dimethylvinylsiloxane units and an intermediate unit consisting of dimethylsiloxane units (viscosity at 23 ° C., 82,000 cP)
A-2: Polymethylvinylsiloxane having both ends blocked with dimethylvinylsiloxane units and an intermediate unit consisting of dimethylsiloxane units (viscosity at 23 ° C. of 420 cP)
B-1: The average unit formula is [H (CH ₃ ) ₂ SiO _1/2 ] ₈ [SiO _4/2 ] ₄ (hydrogen amount: 1.05% by weight)
B-2: Polymethylhydrogensiloxane having both ends blocked with dimethylhydrogensiloxane units and an intermediate unit consisting of dimethylsiloxane units (viscosity at 23 ° C., 20 cP)
C-1: obtained by heating chloroplatinic acid with 1,3-divinyl-1,1,3,3-tetramethyldisiloxane at a molar ratio of 1: 4, and the platinum content is 4.91% by weight A complex.
E-1: Polymethylsiloxane having both ends blocked with trimethylsiloxane units and an intermediate unit consisting of dimethylsiloxane units (viscosity at 23 ° C. of 100 cP)
A′-1: Vinyltriethoxysilane A′-2: Polymethylvinylsiloxane having one end blocked with a dimethylvinylsiloxane unit, the other end blocked with a trimethylsiloxane unit, and an intermediate unit consisting of a dimethylsiloxane unit ( Viscosity at 23 ° C 800 cP)

The physical properties were evaluated as follows. The results are shown in Table 1.
(1) Viscosity The viscosity at 23 ° C. was measured using a rotational viscometer (Bismetron VDA-L) (manufactured by Shibaura System Co., Ltd.).

(2) Temporary fixing time The first component composition is applied to the entire surface of the first plate (25 mm diameter parallel plate), and the second component composition is applied to the second plate (25 mm diameter parallel). The amount of the second component application thickness was applied to the entire surface of the plate. The measurement was started after bonding with the total thickness of the first component coating thickness and the second component coating thickness. At 25 ° C., evaluation was carried out with a viscoelasticity measuring device (ARES manufactured by TA Instruments Japan Co., Ltd.) at a frequency of 10 Hz and a strain of 2%, and the time when the storage elastic modulus reached 150 Pa was defined as a temporary fixing time.

(3) Yellow Index The first component is applied to the first glass plate (5 cm × 5 cm × 1 mm thick) so that the compositions of the examples and comparative examples have a total thickness of the first component coating thickness and the second component coating thickness. The amount corresponding to the first component application thickness was applied to the entire surface, and the second component was applied to the second glass plate (5 cm × 5 cm × 1 mm thickness) over the entire surface in the amount corresponding to the second component application thickness. At room temperature (25 ° C.), the second glass was laminated on the first glass, and after the sample cured for 30 minutes at room temperature and 30 minutes at 70 ° C. was returned to the state of 23 ° C., the index of the degree of discoloration A certain yellow index was evaluated by a spectrophotometer (CM-3500d manufactured by Minolta Co., Ltd.).

(4) Transmittance The first component of the first glass plate (5 cm × 5 cm × 1 mm thick) so that the compositions of the examples and comparative examples have a total thickness of the first component coating thickness and the second component coating thickness. The amount of the first component application thickness was applied to the entire surface, and the second component was applied to the entire surface of the second glass plate (5 cm × 5 cm × 1 mm thickness). At room temperature (25 ° C.), the second glass was bonded onto the first glass, and after the sample cured for 30 minutes at room temperature and 30 minutes at 70 ° C. was returned to the state of 23 ° C., the transparency index A certain transmittance was evaluated by a spectrophotometer (CM-3500d manufactured by Minolta Co., Ltd.).

  The two-component compositions of the examples all showed excellent rapid curability and adhesiveness. From these, the composition of the present invention does not require the use of a special device such as radiation or a heating device in the curing reaction, and can be bonded even with a member that does not transmit ultraviolet rays or a member with poor heat resistance, and with an external environment such as moisture. It can be seen that the curing reaction is possible without being affected by the above.

  The two-part curable polyorganosiloxane composition of the present invention is used for adhesion of various substrates, in particular, a base having an image display part of an image display device such as a cathode ray tube, liquid crystal, plasma, organic EL, and a translucent protective part. It is useful for adhesion to

Claims (9)

(A) an alkenyl group-containing polyorganosiloxane containing two or more alkenyl groups in the molecule;
(B) a polyorganohydrogensiloxane having two or more hydrogen atoms bonded to silicon atoms in the molecule; and (C) a platinum-based catalyst,
The ratio of the number H _B of hydrogen atoms bonded to the silicon atom in (B) to the number Vi _A of alkenyl groups in (A) is 0.5 to 100,
(C) is 0.5 to 1000 ppm by weight as a platinum group metal equivalent.
A composition comprising a first component and a second component,
The first component contains (C), does not contain (B),
The second component contains (A) and (B), does not contain (C),
The step of applying the first component to the adherend surface of one substrate, the step of applying the second component to the adherend surface of the substrate not coated with the first component, and bonding the coated substrate together It is an adhesive for bonding two substrates, including the steps of curing and bonding.
Two-part curable polyorganosiloxane composition.   The two-component curable polyorganosiloxane composition according to claim 1, wherein the coating thickness of the first component is 0.1 to 50 µm.   The two-component curable polyorganosiloxane composition according to claim 1 or 2, wherein the first component further comprises a substance imparting wettability.   The two-part curable polyorganosiloxane composition according to claim 3, wherein the substance imparting wettability is (A ') an organosilicon compound containing 0 or more and less than 2 alkenyl groups in the molecule.   The two-part curable polyorganosiloxane composition according to claim 4, wherein (A ') is a silane compound or a siloxane compound containing 0 or more and less than 2 alkenyl groups in the molecule.   The dual agent according to any one of claims 1 to 5, wherein the viscosity of the first component is 1 to 100,000 cP at 23 ° C, and the viscosity of the second component is 100 to 100,000 cP at 23 ° C. Type curable polyorganosiloxane composition   The two-part curable polyorganosiloxane composition according to any one of claims 1 to 6, which is an adhesive between a base having an image display part of an image display device and a translucent protective part.   It is a manufacturing method of the adhesive body containing two base materials using the two agent type curable polyorganosiloxane composition of any one of Claims 1-6, Comprising: The to-be-adhered surface of one base material The step of applying the first component to the substrate, the step of applying the second component to the adherend surface of the substrate to which the first component has not been applied, and the step of bonding and curing and bonding the applied substrate. Production method.   An image display using the two-part curable polyorganosiloxane composition according to any one of claims 1 to 6, wherein a base portion having an image display portion of an image display device and a translucent protective portion are bonded. A method for manufacturing an apparatus, the step of applying a first component or a second component to a bonded surface of a base portion of an image display unit of an image display device, a second component or a second component applied to a bonded surface of a translucent protection unit. A step of applying one component (however, different from the component applied to the adherend surface of the base of the image display unit of the image display device), and the base of the image display unit of the applied image display device and the translucent protection The manufacturing method of an image display apparatus including the process of bonding a part and making it harden | cure and adhere | attach.