JP6950758B2 - Curable resin composition - Google Patents

Description

The present invention relates to a curable resin composition.

Conventionally, as a sealing material, a composition containing a polyoxyalkylene polymer having a reactive silicon group and a (meth) acrylic polymer having a reactive silicon group has been known.

For example, Patent Document 1 describes a crosslinkable silyl group-containing organic polymer (A) and a crosslinkable silyl group-containing organic polymer (A) for the purpose of providing a sealing material composition having paint adhesion and non-staining property and excellent workability. Described are curable sealants and the like containing a specific crosslinkable silyl group-terminated (meth) acrylic acid ester polymer (B) having a glass transition temperature of −100 ° C. to −10 ° C.

Japanese Patent No. 5138186

Under these circumstances, the present inventors prepared a composition containing a vinyl polymer having a reactive silyl group and a polyoxyalkylene polymer having a reactive silyl group with reference to Patent Document 1, and evaluated the composition. As a result, it became clear that such a composition may have low weather resistance (Comparative Example 5).
In addition, the present inventors have a composition containing a vinyl polymer having a small weight average molecular weight and / or a number average molecular weight (Comparative Example 4), and the total number and / or side of reactive silyl groups in the vinyl polymer. It was found that the composition having a small number of reactive silyl groups in the chain (Comparative Example 6) had poor weather resistance.
Therefore, an object of the present invention is to provide a curable resin composition having excellent weather resistance.

As a result of diligent research to solve the above problems, the present inventors have included a vinyl polymer (a) in which the molecular chain has a repeating unit made of a polymerizable vinyl monomer and a specific group is bonded to the terminal. Reactive silyl groups at the ends and side chains of the molecular chain, the molecular chain has repeating units with polymerizable vinyl monomers, the total number of reactive silyl groups, the number of reactive silyl groups at the ends and side chains. By containing the vinyl polymer (A) in which the weight average molecular weight, the number average molecular weight and the glass transition temperature are each in a specific range, and the polyoxyalkylene polymer (B) in which the number average molecular weight is in a specific range. We have found that a desired effect can be obtained, and have arrived at the present invention.
The present invention is based on the above findings and the like, and specifically solves the above problems by the following configurations.

式（ＩＩ）中、Ｒ^2-1は水素原子または１価の炭化水素基を表し、Ｌ²は２価の連結基を表し、Ｒ^2-2は１価の炭化水素基を表す。
式（ＩＩＩ）中、Ｒ^3-1は水素原子または１価の炭化水素基を表し、Ｌ³は２価の連結基を表し、Ｒ^3-2およびＲ^3-3はそれぞれ独立に１価の炭化水素基を表し、ｍ３は１〜３であり、ｎ３は０〜２であり、ｍ３＋ｎ３は３である。
［１４］ 式（ＩＩＩ）において、ｍ３が２であり、ｎ３が１である、［１３］に記載の硬化性樹脂組成物。
［１５］ 式（Ｉ）で表される基が、下記式（Ｉ−１）で表される基である、［１］〜［１４］のいずれかに記載の硬化性樹脂組成物。

式（Ｉ−１）中、Ｒ^1-1は２価の炭化水素基を表し、Ｒ^1-2およびＲ^1-3はそれぞれ独立に１価の炭化水素基を表し、ｍ１は１〜３であり、ｎ１は０〜２であり、ｍ１＋ｎ１は３であり、*は結合位置を表す。
［１６］ 式（Ｉ−１）において、ｍ１は２であり、ｎ１は１である、［１５］に記載の硬化性樹脂組成物。
［１７］ 上記ビニル重合体（ａ）が、式（Ｉ）で表される基を有する末端を１個有する、［１］〜［１６］のいずれかに記載の硬化性樹脂組成物。
［１８］ 上記ビニル重合体（ａ）が、更に、上記分子鎖の側鎖に反応性シリル基を有する、［１］〜［１７］のいずれかに記載の硬化性樹脂組成物。
［１９］ 上記ビニル重合体（Ａ）において、上記分子鎖の末端に有する反応性シリル基が、下記式（Ｖ）で表される基である、［１］〜［１８］のいずれかに記載の硬化性樹脂組成物。
*−Ｓ−Ｌ¹−Ｘ¹ （Ｖ）
式（Ｖ）中、Ｓは硫黄原子であり、Ｌ¹は２価の連結基を表し、Ｘ¹は反応性シリル基を表し、＊は結合位置を表す。
［２０］ 上記ビニル重合体（Ａ）において、上記反応性シリル基の全数が、１分子あたり平均で、１個を超え１．８０個未満である、［１］〜［１９］のいずれかに記載の硬化性樹脂組成物。
［２１］ 上記ビニル重合体（Ａ）において、上記末端に有する反応性シリル基および上記側鎖に有するに有する反応性シリル基のうち、少なくとも１つが、ジアルコキシシリル基である、［１］〜［２０］のいずれかに記載の硬化性樹脂組成物。[1] Reactive silyl groups are provided at the end and side chains of the molecular chain, and the molecular chain has a repeating unit made of a polymerizable vinyl monomer.
On average, the total number of reactive silyl groups per molecule exceeds 1, the number of reactive silyl groups at the ends exceeds 0.5, and the number of reactive silyl groups in the side chain is 0. .More than 5 pieces
A vinyl polymer (A) having a weight average molecular weight of 30,000 to 110,000, a number average molecular weight of 9,000 to 40,000, and a glass transition temperature of -100 to -10 ° C.
A polyoxyalkylene polymer (B) having a reactive silyl group, a molecular chain substantially polyoxyalkylene, and a number average molecular weight of 10,000 to 50,000.
Contains a curing catalyst (C)
The vinyl polymer (A) is a vinyl polymer (a) having a repeating unit in which the molecular chain is made of a polymerizable vinyl monomer and having a group represented by the following formula (I) at the end of the molecular chain. Curable resin composition, including.
* -SL ^1- X ¹ (I)
In formula (I), S is a sulfur atom, L ¹ represents a divalent linking group, X ¹ represents a reactive silyl group, and * represents a bond position.
[2] The curable resin composition according to [1], wherein the mass ratio (A: B) of the vinyl polymer (A) to the polyoxyalkylene polymer (B) is 10:90 to 90:10. thing.
[3] The curing catalyst (C) is at least one selected from the group consisting of tin compounds, titanium compounds, acidic compounds and amine compounds.
The content of the curing catalyst (C) is 0.1 to 20 parts by mass with respect to 100 parts by mass in total of the vinyl polymer (A) and the polyoxyalkylene polymer (B) [1]. Alternatively, the curable resin composition according to [2].
[4] The curable resin composition according to any one of [1] to [3], which further contains a hollow resin body.
[5] The curable resin composition according to any one of [1] to [4], which further contains an anti-aging agent.
[6] Further, it contains at least one plasticizer of an oxyalkylene polymer and a vinyl polymer having a number average molecular weight of 1,500 to 15,000.
[1] to [5], wherein the content of the plasticizer is 1 to 100 parts by mass with respect to a total of 100 parts by mass of the vinyl polymer (A) and the polyoxyalkylene polymer (B). The curable resin composition according to any one.
[7] The curable resin composition according to any one of [1] to [6], wherein the vinyl polymer (A) has a weight average molecular weight of 45,000 to 90,000.
[8] The curable resin composition according to any one of [1] to [7], wherein the vinyl polymer (A) has a number average molecular weight of more than 10,000 and less than 20,000.
[9] The curable resin composition according to any one of [1] to [8], wherein the vinyl polymer (A) further has a hydrocarbon group in the side chain. However, the above hydrocarbon group does not have a reactive silyl group.
[10] The curable resin composition according to [9], wherein the hydrocarbon group has 1 to 12 carbon atoms.
[11] The curable resin composition according to any one of [1] to [10], wherein the molecular chain of the vinyl polymer (A) is linear.
[12] The curable resin composition according to any one of [1] to [11], wherein the reactive silyl group as _{X 1} is a dialkoxysilyl group in the formula (I).
[13] Any of [1] to [12], wherein the molecular chain of the vinyl polymer (A) has a repeating unit represented by the following formula (II) and a repeating unit represented by the formula (III). The curable resin composition according to.

In formula (II), R ^2-1 represents a hydrogen atom or a monovalent hydrocarbon group, L ² represents a divalent linking group, and R ^2-2 represents a monovalent hydrocarbon group.
In formula (III), R ^3-1 represents a hydrogen atom or a monovalent hydrocarbon group, L ³ represents a divalent linking group, and R ^3-2 and R ^3-3 are independently monovalent. Representing a hydrocarbon group, m3 is 1-3, n3 is 0-2, and m3 + n3 is 3.
[14] The curable resin composition according to [13], wherein m3 is 2 and n3 is 1 in the formula (III).
[15] The curable resin composition according to any one of [1] to [14], wherein the group represented by the formula (I) is a group represented by the following formula (I-1).

In formula (I-1), R ^1-1 represents a divalent hydrocarbon group, R ^1-2 and R ^1-3 each independently represent a monovalent hydrocarbon group, and m1 is 1-3. Yes, n1 is 0-2, m1 + n1 is 3, and * represents the coupling position.
[16] The curable resin composition according to [15], wherein m1 is 2 and n1 is 1 in the formula (I-1).
[17] The curable resin composition according to any one of [1] to [16], wherein the vinyl polymer (a) has one terminal having a group represented by the formula (I).
[18] The curable resin composition according to any one of [1] to [17], wherein the vinyl polymer (a) further has a reactive silyl group in the side chain of the molecular chain.
[19] The above-mentioned vinyl polymer (A) according to any one of [1] to [18], wherein the reactive silyl group at the end of the molecular chain is a group represented by the following formula (V). Curable resin composition.
* -S-L ^1- X ¹ (V)
In formula (V), S is a sulfur atom, L ¹ represents a divalent linking group, X ¹ represents a reactive silyl group, and * represents a bond position.
[20] In the vinyl polymer (A), any one of [1] to [19], wherein the total number of the reactive silyl groups per molecule is more than 1 and less than 1.80 on average. The curable resin composition according to the above.
[21] In the vinyl polymer (A), at least one of the reactive silyl group at the terminal and the reactive silyl group at the side chain is a dialkoxysilyl group, [1] to The curable resin composition according to any one of [20].

The curable resin composition of the present invention has excellent weather resistance.

The present invention will be described in detail below.
In the present specification, (meth) acrylate represents acrylate or methacrylate, (meth) acryloyl represents acryloyl or methacryloyl, and (meth) acrylic represents acrylic or methacrylic. Poly (meth) acrylate represents polyacrylate, polymethacrylate, or a copolymer of acrylate and methacrylate.
In addition, the numerical range represented by using "~" in the present specification means a range including the numerical values before and after "~" as the lower limit value and the upper limit value.
In the present specification, the method for producing each component is not particularly limited. For example, conventionally known ones can be mentioned.
In the present specification, unless otherwise specified, each component may use a substance corresponding to the component individually or in combination of two or more kinds. When a component contains two or more substances, the content of the component means the total content of the two or more substances.
In the present specification, better weather resistance may mean better effect of the present invention.

[Curable resin composition]
The curable resin composition of the present invention (the composition of the present invention) is
It has a reactive silyl group at the end and side chains of the molecular chain, and the molecular chain has a repeating unit made of a polymerizable vinyl monomer.
On average, the total number of reactive silyl groups per molecule exceeds 1, the number of reactive silyl groups at the ends exceeds 0.5, and the number of reactive silyl groups in the side chain is 0. .More than 5 pieces
A vinyl polymer (A) having a weight average molecular weight of 30,000 to 110,000, a number average molecular weight of 9,000 to 40,000, and a glass transition temperature of -100 to -10 ° C.
A polyoxyalkylene polymer (B) having a reactive silyl group, a molecular chain substantially polyoxyalkylene, and a number average molecular weight of 10,000 to 50,000.
Contains a curing catalyst (C)
The vinyl polymer (A) is a vinyl polymer (a) having a repeating unit in which the molecular chain is made of a polymerizable vinyl monomer and having a group represented by the following formula (I) at the end of the molecular chain. It is a curable resin composition containing.
* -SL ^1- X ¹ (I)
In formula (I), S is a sulfur atom, L ¹ represents a divalent linking group, X ¹ represents a reactive silyl group, and * represents a bond position.

Since the composition of the present invention has such a structure, it is considered that a desired effect can be obtained. The reason is not clear, but it is presumed to be as follows.
Generally, when a polyoxyalkylene polymer having a reactive silyl group is exposed to an outdoor environment, the bond between carbon oxygen in the polyoxyalkylene which is a molecular chain (main chain) is affected by the external environment. Easy to cut. Therefore, the sealing material containing the polyoxyalkylene polymer usually has low weather resistance.

On the other hand, the vinyl polymer (A) and the vinyl polymer (a) contained in the present invention are chemically stable as compared with polyoxyalkylene.
Further, since the vinyl polymer (A) has a large weight average molecular weight and / or a number average molecular weight, even if the polyoxyalkylene polymer is cleaved in the molecular chain, it can be obtained by the presence of the vinyl polymer (A). The elongation of the sealant can be maintained within an appropriate range.
For the above reasons, it is presumed that the sealing material obtained by using the composition of the present invention has excellent weather resistance.
Hereinafter, each component contained in the composition of the present invention will be described in detail.

<< Vinyl Polymer (A) >>
The vinyl polymer (A) contained in the composition of the present invention has a reactive silyl group at the terminal and side chains of the molecular chain, and the molecular chain has a repeating unit made of a polymerizable vinyl monomer.
On average, the total number of reactive silyl groups per molecule exceeds 1, the number of reactive silyl groups at the ends exceeds 0.5, and the number of reactive silyl groups in the side chain is 0. .More than 5 pieces
It is a polymer having a weight average molecular weight of 30,000 to 110,000, a number average molecular weight of 9,000 to 40,000, and a glass transition temperature of -100 to -10 ° C.
The composition of the present invention is excellent in weather resistance by containing the vinyl polymer (A).

<Molecular chain>
In the present invention, the vinyl polymer (A) has a molecular chain, and the molecular chain has a repeating unit made of a polymerizable vinyl monomer.
Since the molecular chain has a repeating unit made of a polymerizable vinyl monomer, the molecular chain (main chain or skeleton) can be substantially a hydrocarbon.
In the present invention, the term "substantially" means that the molecular chain of the vinyl polymer (A) may further contain repeating units other than − [CC] −, but the above- [CC]. ] -Content is 50% by mass or more with respect to the total of the repeating units of the vinyl polymer (A). The content of − [CC] − is preferably 80% by mass or more with respect to the total.

Examples of the molecular chain of the vinyl polymer (A) include poly (meth) acrylate-based polymers. The same applies to the molecular chain of the vinyl polymer (a).

The repeating unit made of the polymerizable vinyl monomer constituting (the skeleton of) the molecular chain is not particularly limited as long as it is a repeating unit made of a compound having a carbon-carbon double bond. For example, olefin monomers such as ethylene; (meth) acrylates, (meth) acrylamide, (meth) acrylic monomers such as (meth) acrylic acid; repetitions with aromatic vinyl monomers such as styrene. The unit is mentioned.

At least a part of the repeating units constituting the molecular chain of the vinyl polymer (A) can have a reactive silyl group. When the repeating unit has a reactive silyl group, the vinyl polymer (A) can have the reactive silyl group in, for example, a side chain. Examples of the repeating unit having a reactive silyl group include a repeating unit made of (meth) acrylate having a reactive silyl group.

(Repeating unit with (meth) acrylate monomer)
Among them, the repeating unit constituting (the skeleton) of the molecular chain (skeleton) of the vinyl polymer (A) is preferably a repeating unit made of a (meth) acrylate monomer from the viewpoint of being more excellent in weather resistance. The (meth) acrylate monomer (repeating unit) may have a reactive silyl group. The repeating unit (or (meth) acrylate monomer) of the (meth) acrylate monomer described later may have a reactive silyl group.

The (meth) acrylate monomer is not particularly limited as long as it is a (meth) acrylic acid ester. Examples of the hydrocarbon group constituting the ester portion of the (meth) acrylic acid ester include an aliphatic hydrocarbon group (linear, branched or cyclic), an aromatic hydrocarbon group, or a combination thereof. Be done.
When the (meth) acrylate monomer has a reactive silyl group, the reactive silyl group can be bonded to, for example, an ester residue in the (meth) acrylate monomer.

The ester residue (hydrocarbon group constituting the ester) in the (meth) acrylate monomer has a hydrocarbon group having 1 to 12 carbon atoms from the viewpoint of excellent weather resistance and excellent elongation of the cured product. Is preferable. However, the carbon number of the ester residue in the (meth) acrylate monomer is such that when the (meth) acrylate monomer has a reactive silyl group in the ester residue, the reactive silyl group is derived from the ester residue. Let it be the carbon number of the ester residue after removal.

Examples of the hydrocarbon group having 1 to 12 carbon atoms include an aliphatic hydrocarbon group such as a propyl group, a butyl group, a pentyl group, a hexyl group, an octyl group, a 2-ethylhexyl group, an isononyl group and a lauryl group; Examples thereof include a divalent or higher aliphatic hydrocarbon group obtained by further removing a hydrogen atom from the group.

(Molecular chain is linear)
The shape of the molecular chain of the vinyl polymer (A) is not particularly limited. The shape of the molecular chain is preferably linear from the viewpoint that the obtained cured product has excellent elongation and the viscosity of the composition is in an appropriate range.

<Reactive silyl group>
The reactive silyl group of the vinyl polymer (A) is not particularly limited as long as it has a silicon atom and is a reactive group. For example, a silyl group in which 1 to 3 hydrolyzable groups are bonded to one silicon atom can be mentioned.
The reactive silyl group of the vinyl polymer (A) has excellent weather resistance, excellent elongation of the obtained cured product, and 2 in one silicon atom from the viewpoint that the viscosity of the composition is in an appropriate range. A silyl group in which individual hydrolyzable groups are bonded is preferable. The same applies to the reactive silyl group having a side chain or a terminal. The same applies to the reactive silyl group of the vinyl polymer (a).
Examples of the hydrolyzable group include hydrogen, halogen atom, alkoxy group, acyloxide group, ketoximate group, amino group, amide group, acid amide group, aminooxy group, mercapto group and alkenyl oxide group. Of these, an alkoxy group is preferable.

The reactive silyl group is preferably a dialkoxysilyl group, preferably an alkyldialkoxysilyl group or a dimethoxysilyl, from the viewpoints of excellent weather resistance, excellent elongation of the obtained cured product, and an appropriate range of viscosity of the composition. Groups are more preferred.

When one or two hydrolyzable groups are bonded to one silicon atom, the groups other than the hydrolyzable groups that can be bonded to the silicon atom are not particularly limited. For example, an aliphatic hydrocarbon group (linear, branched or cyclic), an aromatic hydrocarbon group, or a combination thereof can be mentioned. Of these, an aliphatic hydrocarbon group having 1 to 6 carbon atoms is preferable. Specific examples thereof include a methyl group and an ethyl group.

(Reactive silyl group and molecular chain)
In the present invention, the vinyl polymer (A) has the reactive silyl group at the terminal and side chains of the molecular chain.
The reactive silyl group can be attached to the end of the molecular chain either directly or via an organic group. The organic group is not particularly limited.
The reactive silyl group can be attached to the side chain of the molecular chain either directly or via an organic group. The organic group is not particularly limited.
The vinyl polymer (A) has a reactive silyl group at the end and a side chain from the viewpoint of excellent weather resistance, excellent elongation of the obtained cured product, and an appropriate range of viscosity of the composition. Of the reactive silyl groups having, at least one is preferably a dialkoxysilyl group, more preferably a dimethoxysilyl group.
In the dialkoxysilyl group (or the dimethoxysilyl group), the other hydrocarbon group that can be bonded to the silicon atom is not particularly limited. For example, an alkyl group can be mentioned. When the dialkoxysilyl group (or the dimethoxysilyl group) has an alkyl group as another hydrocarbon group that can be bonded to the silicon atom, it becomes an alkyldialkoxysilyl group (or an alkyldimethoxysilyl group).
The vinyl polymer (A) has a reactive silyl group at the end and a side chain from the viewpoint of excellent weather resistance, excellent elongation of the obtained cured product, and an appropriate range of viscosity of the composition. It is preferable that all of the reactive silyl groups having are dialkoxysilyl groups.

The vinyl polymer (A) is, for example, a mixture of vinyl polymers having the reactive silyl group at the terminal or side chain of the molecular chain; a vinyl polymer having the reactive silyl group at the terminal or side chain of the molecular chain. It may be a mixture of a vinyl polymer having the reactive silyl group at the terminal or side chain of the molecular chain and a vinyl polymer having the reactive silyl group at the terminal or side chain of the molecular chain. In each of the above embodiments, the vinyl polymer (A) may further contain a vinyl polymer having no reactive silyl group.

<Total number of reactive silyl groups>
In the present invention, the total number of the reactive silyl groups that the vinyl polymer (A) has on average per molecule exceeds one.
The total number of the reactive silyl groups is the number of the reactive silyl groups that the vinyl polymer (A) has on average per molecule in the entire vinyl polymer (A).

From the viewpoint of being more excellent in weather resistance, the total number is preferably more than 1 and 3 or less, more preferably more than 1 and 2 or less, and more than 1 and 1.80. Less than is more preferred.
The total number of the reactive silyl groups can be the total number of the number of reactive silyl groups at the terminal and the number of reactive silyl groups in the side chain, which will be described later.

In the present invention, the number (total number) of reactive silyl groups is theoretically determined from the composition ratio and number average molecular weight (Mn) of the monomer and chain transfer agent used in the production of the vinyl polymer (A). It can be calculated by calculating the number of reactive silyl groups per molecule of the polymer and the group represented by the formula (I). Regarding the vinyl polymer (A) described later, the number of the reactive silyl groups having the terminal or side chain, the number of groups represented by the formula (V) having the terminal; the vinyl polymer (a) described later The same applies to the number of reactive silyl groups having and the number of groups represented by the formula (I) having at the end.

<Reactive silyl group at the terminal>
The vinyl polymer (A) has a reactive silyl group at the terminal from the viewpoints of excellent weather resistance, excellent elongation of the cured product, and an appropriate range of viscosity of the composition.

When the reactive silyl group is bonded to the end of the molecular chain of the vinyl polymer (A) via an organic group, the group having the reactive silyl group is represented by, for example, the following formula (V). The group is mentioned.

* -S-L ^1- X ¹ (V)
In formula (V), S is a sulfur atom, L ¹ represents a divalent linking group, X ¹ represents a reactive silyl group, and * represents a bond position.

The above formula (V) is the same as the group represented by the formula (I) that the vinyl polymer (a) described later has at the end of the molecular chain.

<Number of reactive silyl groups at the end>
In the present invention, the number of the reactive silyl groups that the vinyl polymer (A) has at the terminal on average per molecule exceeds 0.5.
The number of the reactive silyl groups is the number of the reactive silyl groups that the vinyl polymer (A) has at the end on average per molecule in the entire vinyl polymer (A).
From the viewpoint of being more excellent in weather resistance, the above number is preferably more than 0.5 and 2 or less, more preferably 0.6 to 1.0, and 0.6 or more on average. Less than 0.9 is more preferable.

<Reactive silyl group in side chain>
The vinyl polymer (A) has a reactive silyl group in the side chain from the viewpoints of excellent weather resistance, excellent elongation of the cured product, and an appropriate range of viscosity of the composition.

When the reactive silyl group is bonded to the side chain of the molecular chain of the vinyl polymer (A) via an organic group, the group having the reactive silyl group is represented by, for example, the following formula (IV). Group is mentioned.

* -L ^4- X ⁴ (IV)
In formula (IV), L ⁴ represents a divalent linking group, X ⁴ represents a reactive silyl group, and * represents a binding position.
L ⁴ of the formula (IV) is the same as L ³ in formula (III) to be described later.
^{X 4} of the formula (IV) is the same as ^{X 1 of the} formula (I) representing the group of the vinyl polymer (a) described later at the end of the molecular chain.

<Number of reactive silyl groups in the side chain>
In the present invention, the number of the reactive silyl groups that the vinyl polymer (A) has on the side chain on average per molecule exceeds 0.5.
The number of the reactive silyl groups is the number of the reactive silyl groups that the vinyl polymer (A) has on the side chain on average per molecule in the entire vinyl polymer (A).
From the viewpoint of being more excellent in weather resistance, the above number is preferably more than 0.5 and 2 or less, more preferably 0.6 to 1.0, and 0.6 or more on average. Less than 0.9 is more preferable.

(Another side chain)
The vinyl polymer (A) preferably has a hydrocarbon group in the side chain from the viewpoints of excellent weather resistance, excellent elongation of the cured product, and an appropriate range of viscosity of the composition. The hydrocarbon group does not have a reactive silyl group.
Examples of the hydrocarbon group include an aliphatic hydrocarbon group (linear, branched or cyclic), an aromatic hydrocarbon group, or a combination thereof. Specific examples thereof include hydrocarbon groups having 1 to 12 carbon atoms, and aliphatic hydrogen groups having 1 to 8 carbon atoms are preferable.

The hydrocarbon group can be bonded to the molecular chain directly or via an organic group.
The organic group is not particularly limited. For example, an ester bond, an amide bond, an ether bond, and a carbonyl group can be mentioned.

(Repeating unit constituting vinyl polymer (A))
-Repeating unit represented by the formula (III) The molecular chain of the vinyl polymer (A) has excellent weather resistance, excellent elongation of the cured product, and the viscosity of the composition is in an appropriate range. It is preferable to have the repeating unit represented by (III).

In formula (III), R ^3-1 represents a hydrogen atom or a monovalent hydrocarbon group, L ³ represents a divalent linking group, and R ^3-2 and R ^3-3 are independently monovalent. Representing a hydrocarbon group, m3 is 1-3, n3 is 0-2, and m3 + n3 is 3.

・ R ^3-1
In formula (III), R ^3-1 represents a hydrogen atom or a monovalent hydrocarbon group.
Examples of the monovalent hydrocarbon group include an aliphatic hydrocarbon group such as a methyl group.

・ L ³
In formula (III), L ³ represents a divalent linking group.
Examples of the divalent linking group as L ^{3 include a divalent hydrocarbon group L 3-1 ; a substituent L 3-2} such as an ester bond, an amide bond, an ether bond and a carbonyl group.
Examples of the divalent hydrocarbon group L ^3-1 include an aliphatic hydrocarbon group (linear, branched or cyclic), an aromatic hydrocarbon group, or a combination thereof. Specifically, for example, an aliphatic hydrocarbon group having 1 to 8 carbon atoms can be mentioned.

Examples of L ³ include a combination of a divalent hydrocarbon group L ^3-1 and a substituent L ^3-2.
Of these, a combination of an aliphatic hydrocarbon group having 1 to 8 divalent carbon atoms and an ester bond is preferable.

・ R ^3-2 , R ^3-3
In formula (III), R ^3-2 and R ^3-3 each independently represent a monovalent hydrocarbon group.
Examples of the monovalent hydrocarbon group include an aliphatic hydrocarbon group (linear, branched or cyclic), an aromatic hydrocarbon group, or a combination thereof.
Of these, an aliphatic hydrocarbon group such as a methyl group or an ethyl group is preferable.

・ M3
In formula (III), m3 is 1-3.
m3 is preferably 2 from the viewpoints of excellent weather resistance, excellent elongation of the obtained cured product, an appropriate range of viscosity of the composition, and an appropriate length of pot life.

・ N3
In formula (III), n3 is 0-2.
n3 is preferably 1 from the viewpoints of excellent weather resistance, excellent elongation of the obtained cured product, an appropriate range of viscosity of the composition, and an appropriate length of pot life.

Examples of the group represented by the above formula (III) include a group represented by the following formula (III-1).

In formula (III-1), R ^3-1 represents a hydrogen atom or a monovalent hydrocarbon group, and R ^3-2 and R ^3-3 each independently represent a monovalent hydrocarbon group, and R ^{3- 4} represents a divalent hydrocarbon group, m3 is 1-3, n3 is 0-2, and m3 + n3 is 3.
R ^3-1 and R ^3-2 , R ^3-3 , m3, and n3 of the formula (III-1) are the same as those of the formula (III).
^{R 3-4} of the formula (III-1) is the same as the above divalent hydrocarbon group L ^3-1 . Of these, a propylene group is preferable.

-Repeating unit represented by the formula (II) The molecular chain of the vinyl polymer (A) is further used as a repeating unit by the (meth) acrylate monomer, for example, a repeating unit represented by the following formula (II). Can have units.

In formula (II), R ^2-1 represents a hydrogen atom or a monovalent hydrocarbon group, L ² represents a divalent linking group, and R ^2-2 represents a monovalent hydrocarbon group.

・ R ^2-1
In formula (II), R ^2-1 represents a hydrogen atom or a monovalent hydrocarbon group.
Examples of the monovalent hydrocarbon group include an aliphatic hydrocarbon group such as a methyl group.

・ L ²
In formula (II), L ² represents a divalent linking group.
Examples of the divalent linking group include an ester bond, an amide bond, an ether bond, and a carbonyl group.
Of these, an ester bond is preferable.

・ R ^2-2
In formula (II), R ^2-2 represents a monovalent hydrocarbon group.
Examples of the monovalent hydrocarbon group include an aliphatic hydrocarbon group (linear, branched or cyclic), an aromatic hydrocarbon group, or a combination thereof.
R ^2-2 is preferably a hydrocarbon group having 1 to 12 carbon atoms, and more preferably a hydrocarbon group having 4 to 8 carbon atoms, from the viewpoint of excellent weather resistance and excellent elongation of the obtained cured product.
Specific examples of R ^2-2 include aliphatic hydrocarbon groups such as a butyl group, a pentyl group, a hexyl group, an octyl group, a 2-ethylhexyl group, an isononyl group and a lauryl group. Of these, a butyl group, a pentyl group, a hexyl group, an octyl group, and a 2-ethylhexyl group are preferable.

<Weight average molecular weight>
In the present invention, the weight average molecular weight of the vinyl polymer (A) is 30,000 to 110,000.
When the weight average molecular weight is in the above range, the composition of the present invention is excellent in weather resistance.

The weight average molecular weight of the vinyl polymer (A) is excellent in weather resistance, the obtained cured product is excellent in elongation, the initial elongation of the cured product can be maintained for a long period of time, and the viscosity of the composition is in an appropriate range. From the viewpoint, 45,000 to 100,000 is preferable, and 50,000 to 90,000 is more preferable.
The weight average molecular weight of the vinyl polymer (A) is preferably 45,000 to 100,000, preferably 60,000 to 90, from the viewpoint of being more excellent in weather resistance and having a viscosity in an appropriate range. 000 is more preferable.

<Number average molecular weight>
In the present invention, the number average molecular weight of the vinyl polymer (A) is 9,000 to 40,000.

The number average molecular weight of the vinyl polymer (A) is excellent in weather resistance (particularly longer-term weather resistance), excellent elongation of the obtained cured product, long-term maintenance of the initial elongation of the cured product, and composition. From the viewpoint that the viscosity of the product is in an appropriate range, it is preferably more than 10,000 and less than 20,000, and more preferably 16,000 or more and less than 20,000.

In the present invention, the vinyl polymer (A) was analyzed by the gel permeation chromatography (GPC) method, and the weight average molecular weight or the number average molecular weight of the vinyl polymer (A) was calculated by polystyrene conversion under the following conditions.

・ Equipment: GPC-8220 (manufactured by Tosoh)
-Column: One G7000HXL / 7.8 mmID, two GMHXL / 7.8 mmID, and one G2500HXL / 7.8 mmID were used.
-Medium: tetrahydrofuran-Flow velocity: 1.0 mL / min
-Concentration: 1.5 mg / ml
・ Injection amount: 300 μL
-Column temperature: 40 ° C

In the present invention, the glass transition temperature (Tg) of the vinyl polymer (A) is −100 to −10 ° C.
When the glass transition temperature is in the above range, the composition of the present invention is excellent in weather resistance.

The glass transition temperature is preferably −60 to −10 ° C. from the viewpoint of excellent weather resistance, excellent elongation of the obtained cured product, and an appropriate range of the viscosity of the composition.

In the present invention, for the glass transition temperature (Tg) of the vinyl polymer (A), a differential thermal analysis (DTA) or a differential scanning calorimeter (DSC) is used to perform a sample (vinyl polymer (A)) at a constant rate. The Tg of the sample can be derived by measuring the intersection of the baseline tangent line on the DTA curve or DSC curve and the tangent line at the steep descending position of the heat absorption region due to the glass transition.

<< Vinyl polymer (a) >>
In the present invention, the vinyl polymer (A) contains the vinyl polymer (a).
In the present invention, the vinyl polymer (a) is a polymer having a repeating unit of a polymerizable vinyl monomer in the molecular chain and having a group represented by the following formula (I) at the end of the molecular chain. ..
* -SL ^1- X ¹ (I)
In formula (I), S is a sulfur atom, L ¹ represents a divalent linking group, X ¹ represents a reactive silyl group, and * represents a bond position.

<Molecular chain>
In the present invention, the molecular chain of the vinyl polymer (a) has a repeating unit made of a polymerizable vinyl monomer.
The molecular chain of the vinyl polymer (a) can be the same as the molecular chain of the vinyl polymer (A).
The repeating unit made of the polymerizable vinyl monomer contained in the molecular chain of the vinyl polymer (a) can be the same as the repeating unit made of the polymerizable vinyl monomer contained in the molecular chain of the vinyl polymer (A). ..

-Side chain The vinyl polymer (a) preferably has a reactive silyl group in the side chain from the viewpoints of excellent weather resistance, excellent elongation of the cured product, and an appropriate range of viscosity of the composition. ..

-Number of reactive silyl groups in the side chain The number of reactive silyl groups in the side chain of the vinyl polymer (a) can be 0 to 2 per molecule of the vinyl polymer (a).
The number of reactive silyl groups in the side chain of the vinyl polymer (a) is excellent in weather resistance, excellent in elongation of the cured product, and the viscosity of the composition is in an appropriate range. a) One or two is preferable per molecule.

The reactive silyl group that the vinyl polymer (a) can have in the side chain can be the same as the reactive silyl group that the vinyl polymer (A) has in the side chain.

<End>
In the present invention, the vinyl polymer (a) has a group represented by the following formula (I) at the end of the molecular chain.
* -SL ^1- X ¹ (I)
In formula (I), S is a sulfur atom, L ¹ represents a divalent linking group, X ¹ represents a reactive silyl group, and * represents a bond position.

・ L ¹
In formula (I), L ¹ represents a divalent linking group.
Examples of the divalent linking group include those similar to the ^{above-mentioned divalent hydrocarbon group L 3-1.}
Of these, a propylene group is preferable.

・ X ¹
In formula (I), X ¹ represents a reactive silyl group.
The reactive silyl group is not particularly limited. For example, the same as above can be mentioned.

The reactive silyl group as X ¹ is preferably a dialkoxysilyl group, preferably an alkyldialkoxysilyl group, from the viewpoints of excellent weather resistance, excellent elongation of the obtained cured product, and an appropriate range of the viscosity of the composition. Is more preferable, and a methyldimethoxysilyl group is further preferable.

・ *
In formula (I), * represents the bond position.
In the present invention, the vinyl polymer (a) has a group represented by the formula (I) at the end of the molecular chain. The group represented by the above formula (I) can be bonded to the end of the molecular chain of the above vinyl polymer (a) in the above *.

The group represented by the above formula (I) can be bonded to the end of the molecular chain of the vinyl polymer (a) directly or via an organic group. The organic group is not particularly limited.

The vinyl polymer (a) preferably has one or more reactive silyl groups per molecule (on average). The reactive silyl group is the same as above.
The number of reactive silyl groups per molecule (on average) of the vinyl polymer (a) is preferably 1 to 6 from the viewpoint of excellent weather resistance and excellent elongation of the obtained cured product. ..

The vinyl polymer (a) preferably has one terminal having a group represented by the formula (I) from the viewpoint of excellent weather resistance and excellent elongation of the obtained cured product.
For example, the residue of the polymerization initiator used in producing the vinyl polymer (A) may be bonded to the other end of the vinyl polymer (a).
In the vinyl polymer (A), for example, the residue of the polymerization initiator used in producing the vinyl polymer (A) may be bonded to the end.

式（Ｉ−１）中、Ｒ^1-1は２価の炭化水素基を表し、Ｒ^1-2およびＲ^1-3はそれぞれ独立に１価の炭化水素基を表し、ｍ１は１〜３であり、ｎ１は０〜２であり、ｍ１＋ｎ１は３であり、*は結合位置を表す。・ Equation (I-1)
The group represented by the formula (I) is represented by the following formula (I-1) from the viewpoint of excellent weather resistance, excellent elongation of the obtained cured product, and an appropriate range of the viscosity of the composition. The group is preferred.

In formula (I-1), R ^1-1 represents a divalent hydrocarbon group, R ^1-2 and R ^1-3 each independently represent a monovalent hydrocarbon group, and m1 is 1-3. Yes, n1 is 0-2, m1 + n1 is 3, and * represents the coupling position.

・ R ^1-1
In formula (I-1), R ^1-1 represents a divalent hydrocarbon group.
Examples of the divalent hydrocarbon group include an aliphatic hydrocarbon group (linear, branched or cyclic), an aromatic hydrocarbon group, or a combination thereof. Of these, an aliphatic hydrocarbon group having 1 to 6 carbon atoms is preferable, and a propylene group is more preferable.

・ R ^1-2 , R ^1-3
In formula (I-1), R ^1-2 and R ^1-3 each independently represent a monovalent hydrocarbon group.
Examples of the monovalent hydrocarbon group include an aliphatic hydrocarbon group (linear, branched or cyclic), an aromatic hydrocarbon group, or a combination thereof.
Of these, an aliphatic hydrocarbon group such as a methyl group or an ethyl group is preferable.

・ M1
In formula (I-1), m1 is 1-3.
m1 is preferably 2 from the viewpoints of excellent weather resistance, excellent elongation of the obtained cured product, an appropriate range of viscosity of the composition, and an appropriate length of pot life.

・ N1
In formula (I-1), n1 is 0 to 2.
n1 is preferably 1 from the viewpoints of excellent weather resistance, excellent elongation of the obtained cured product, an appropriate range of viscosity of the composition, and an appropriate length of pot life.

・ *
In formula (I-1), * represents the binding position. * In formula (I-1) is the same as * in formula (I).

The weight average molecular weight, the number average molecular weight, or the glass transition temperature of the vinyl polymer (a) can be the same as those of the vinyl polymer (A), respectively.

In the present invention, all or part of the vinyl polymer (A) may be the vinyl polymer (a).
When a part of the vinyl polymer (A) is the vinyl polymer (a), the vinyl polymer (A) has a polymerizable vinyl monomer in the molecular chain in addition to the vinyl polymer (a). A vinyl polymer (a') having a repeating unit according to the above and having a reactive silyl group at the terminal and / or the side chain (excluding the vinyl polymer (a) described above) may be further contained.
Further, the vinyl polymer (A) may further contain a vinyl polymer (a ″) whose molecular chain has a repeating unit made of a polymerizable vinyl monomer but does not have a reactive silyl group.
The vinyl polymer (a ′) or the vinyl polymer (a ″) may be a by-product of producing the vinyl polymer (A).

-Content of vinyl polymer (a) The content of the vinyl polymer (a) can be 0.1 to 100% by mass with respect to the entire vinyl polymer (A).

(Method for producing vinyl polymer (A))
The method for producing the vinyl polymer (A) is not particularly limited. For example, the vinyl polymer (A) can be produced by polymerizing the polymerizable vinyl monomer in the presence of a polymerization initiator and a chain transfer agent.

-Polymerizable vinyl monomer The polymerizable vinyl monomer is not particularly limited as long as it is a compound having a carbon-carbon double bond.
Examples of the polymerizable vinyl monomer include compounds represented by the following formula (III'). As the polymerizable vinyl monomer, for example, a compound represented by the following formula (II') can be used. As one of the preferable embodiments, it is preferable to use a compound represented by the following formula (III') and a compound represented by the following formula (II') in combination as the polymerizable vinyl monomer.

The compound represented by the above formula (II') can form a repeating unit represented by the above formula (II).
The compound represented by the above formula (III') can form a repeating unit represented by the above formula (III).

-Chain transfer agent Examples of the chain transfer agent include compounds represented by ^{the formula (I'): HS-L 1-} X ^1.
The compound represented by the above formula (I') can form a group represented by the above formula (I) at the end of the vinyl polymer (a). The same applies to the vinyl polymer (A).

-Amount of compound represented by formula (III') When the compound represented by the above formula (II') and the compound represented by the above formula (III') are used in combination as the polymerizable vinyl monomer, when the compound represented by the above formula (II') is used in combination. The amount of the compound represented by the above formula (III') is excellent in weather resistance, excellent in elongation of the obtained cured product, and the viscosity of the composition is in an appropriate range. It is preferably 0.1 to 100 parts by mass, preferably 0.4 to 2.0 parts by mass, and 0.5 to 1.5 parts by mass with respect to 100 parts by mass of the compound represented by. More preferably.

When the molecular chain (main chain) of the vinyl polymer (A) has a repeating unit represented by the formula (II) and a repeating unit represented by the formula (III), the vinyl polymer (the vinyl polymer) The molar ratio of the compound represented by the above formula (II') to the compound represented by the above formula (III') used in producing A) is the molecular chain of the vinyl polymer (A). It can be reflected in the number of repeating units of the repeating unit represented by the above formula (II) and the repeating unit represented by the formula (III) constituting (main chain).

-Amount of chain transfer agent used The amount of the chain transfer agent used is a single amount of the above-mentioned polymerizable vinyl from the viewpoint of excellent weather resistance, excellent elongation of the obtained cured product, and an appropriate range of the viscosity of the composition. It is preferably 0.2 to 5 parts by mass, and more preferably 0.8 to 3.6 parts by mass with respect to 100 parts by mass of the total amount of the body.
By reducing the amount of the chain transfer agent used, the weight average molecular weight and / or the number average molecular weight of the vinyl polymer (A) can be increased.

-Polymerization initiator The above polymerization initiator is not particularly limited. For example, azo compounds such as azobisisobutyronitrile, organic peroxides, and metallocene catalysts can be mentioned.
The amount of the polymerization initiator used is not particularly limited.
The amount of the polymerization initiator used is preferably 0.05 to 5.0 parts by mass, preferably 0.1 to 3.0 parts by mass, based on 100 parts by mass of the total amount of the polymerizable vinyl monomer. Is more preferable.

In the above production method, a solvent can be used if necessary.

The vinyl polymer (A) preferably does not have a urethane bond or a urea bond as one of the preferred embodiments. The same applies to the vinyl polymer (a).

<< Polyoxyalkylene polymer (B) >>
The polyoxyalkylene polymer (B) contained in the composition of the present invention has a reactive silyl group, the molecular chain (main chain) is substantially polyoxyalkylene, and the number average molecular weight is 10. It is a polymer, which is 000 to 50,000.
The composition of the present invention has preferable workability (handleability) as a sealing material by containing the polyoxyalkylene polymer (B).
Further, the composition of the present invention is excellent in weather resistance when the number average molecular weight of the polyoxyalkylene polymer (B) is within the above-mentioned predetermined range.

<Reactive silyl group>
The reactive silyl group of the polyoxyalkylene polymer (B) is not particularly limited. The reactive silyl group is preferably a silyl group having a hydrolyzable group. The hydrolyzable silyl group is the same as above.
The reactive silyl group of the polyoxyalkylene polymer (B) has excellent weather resistance, excellent elongation of the obtained cured product, an appropriate range of viscosity of the composition, and an appropriate pot life. From the viewpoint of securing, a silyl group in which two hydrolyzable groups are bonded to one silicon atom is preferable.
The reactive silyl group is a dialkoxysilyl group from the viewpoints of excellent weather resistance, excellent elongation of the obtained cured product, an appropriate range of viscosity of the composition, and an appropriate pot life. Is preferable, and alkyldialkoxysilyl groups and dimethoxysilyl groups are more preferable.

The above-mentioned reactive silyl from the viewpoint that the polyoxyalkylene polymer (B) is superior in weather resistance, excellent in cured physical properties, the viscosity of the composition is in an appropriate range, and the pot life can be secured in an appropriate length. It is preferable to have one or more groups in one molecule on average, and more preferably one or two groups.

The average number of reactive silyl groups contained in the polyoxyalkylene polymer (B) is the average number determined by a method of quantifying ^{protons on carbon to which the reactive silyl groups are directly bonded by a high-resolution 1 H-NMR measurement method.} Can be defined as. In the calculation of the average number of reactive silyl groups contained in the polyoxyalkylene polymer (B), the reactive silyl group was introduced into the polyoxyalkylene polymer precursor before the reactive silyl group was introduced. At the same time, the same main chain is used for the modified product of the polyoxyalkylene polymer precursor in which the reactive silyl group is not introduced and the polyoxyalkylene polymer precursor in which the by-produced reactive silyl group is not introduced. As a part of the component of the polyoxyalkylene polymer (B) having a structure, the calculation is performed by including it in the population (number of molecules) when calculating the average number of reactive silyl groups in one molecule. Can be done.

<Molecular chain>
The molecular chain of the polyoxyalkylene polymer (B) is substantially polyoxyalkylene.
In the present invention, the above-mentioned "substantially" means that the molecular chain of the polyoxyalkylene polymer (B) may further contain a repeating unit other than the oxyalkylene group, but the content of the oxyalkylene group is It means that it is 50% by mass or more with respect to the total of the repeating units of the polyoxyalkylene polymer (B). The content of the oxyalkylene group is preferably 80% by mass or more with respect to the total.

Examples of the polyoxyalkylene include polyoxyethylene, polyoxypropylene, polyoxytrimethylene, polyoxytetramethylene, copolymers thereof, and derivatives thereof having a substituent.

The reactive silyl group can be attached to the molecular chain directly or via an organic group. The organic group is not particularly limited.
The polyoxyalkylene polymer (B) can have the reactive silyl group at the end and / or side chain of the molecular chain.
The polyoxyalkylene polymer (B) preferably has the reactive silyl group at the end of the molecular chain.

When the polyoxyalkylene polymer (B) has the reactive silyl group at the end of the molecular chain, it is superior in weather resistance, excellent in elongation of the obtained cured product, and the viscosity of the composition is in an appropriate range and can be used. From the viewpoint that the time can be secured with an appropriate length, it is preferable to have a reactive silyl group at 50% or more of all the ends of the molecular chain, more preferably 60% or more, still more preferably 60 to 85%.

<Number average molecular weight>
In the present invention, the number average molecular weight of the polyoxyalkylene polymer (B) is 10,000 to 50,000.
The viewpoint that the number average molecular weight of the polyoxyalkylene polymer (B) is excellent in weather resistance (particularly, longer-term weather resistance), the obtained cured product is excellent in elongation, and the viscosity of the composition is in an appropriate range. Therefore, it is preferably 15,000 to 35,000.

In the present invention, the number average molecular weight of the polyoxyalkylene polymer (B) is a standard polystyrene-equivalent value based on a value measured by gel permeation chromatography (GPC) using tetrahydrofuran (THF) as a solvent.

The polyoxyalkylene polymer (B) preferably has no urethane bond or urea bond as one of the preferred embodiments.

(Method for producing polyoxyalkylene polymer (B))
The method for producing the polyoxyalkylene polymer (B) is not particularly limited. For example, in one molecule, the formula (VI): CH ₂ = C (R ³ ) -R ^2- O-
(In the formula (VI), R ² represents a divalent organic group having 1 to 20 carbon atoms, and R ₃ represents a hydrogen atom or a monovalent hydrocarbon group.) A polyoxy having an unsaturated group at the end. With alkylene-based polymer precursors
Formula (VII): HX
(In the formula (VII), X represents a reactive silyl group.) A method of reacting the reactive silyl group-containing compound represented by the formula (VII) in the presence of a Group VIII transition metal catalyst can be mentioned.

Wherein in (VI), examples of the divalent organic group having 1 to 20 carbon atoms, for _{example, CH 2 = CH-CH 2} -, CH 2 = CH-C 2 H 4 -, CH 2 = C (CH 3) −CH ₂ − can be mentioned. From the viewpoint of reactivity, the organic group is preferably CH ₂ = CH-CH _2- (allyl group) and CH ₂ = C (CH ₃ ) -CH _2- (metallic group).
In the formula (VI), examples of the monovalent hydrocarbon group include an aliphatic hydrocarbon group having 1 to 10 carbon atoms such as a methyl group.
Examples of the method for producing the polyoxyalkylene-based polymer precursor include conventionally known methods.

The reactive silyl group in formula (VII) is the same as above.

As the Group VIII transition metal catalyst, for _{example, H 2 PtCl 6 · 6H 2} O, platinum - vinylsiloxane complex, a platinum - olefin complexes, Pt _{metal, RhCl (PPh 3) 3,} RhCl 3, Rh / Al 2 O 3 _{, RuCl 3, IrCl 3, FeCl} 3, PdCl 2 · 2H 2 O, NiCl 2 and the like. The Group VIII transition metal catalyst, in terms of reactivity of the _{hydrosilylation, H 2 PtCl 6 · 6H 2} O, platinum - (di) vinyl siloxane complex, platinum - is preferably any olefin complexes.

Examples of commercially available products of the polyoxyalkylene polymer (B) include MS polymer (manufactured by Kaneka Corporation), silyl polymer (manufactured by Kaneka Corporation), and exestar (manufactured by Asahi Glass Co., Ltd.).

(Mass ratio of vinyl polymer (A) and polyoxyalkylene polymer (B))
The mass ratio (A: B) of the vinyl polymer (A) to the polyoxyalkylene polymer (B) is superior in weather resistance (particularly longer-term weather resistance), and the initial elongation of the cured product is extended over a long period of time. From the viewpoint that the viscosity can be maintained at 10:90 to 90:10, more preferably 50:50 to 90:10, 60: It is more preferably 40 to 90:10.

<< Curing catalyst (C) >>
The curing catalyst (C) contained in the composition of the present invention is not particularly limited as long as it is a catalyst capable of acting on the reactive silyl group or the group represented by the formula (I).

As the curing catalyst (C), for example, a catalyst that hydrolyzes and / or condenses a hydrolyzable silyl group, or a conventionally known catalyst that is generally used as a silanol condensation catalyst can be used. Examples thereof include tin compounds, titanium compounds, acidic compounds and amine compounds.

Of these, tin compounds are preferable from the viewpoint of excellent curing rate and / or storage stability.
Examples of the tin compound include tetravalent dialkyltin compounds (for example, dimethyltin compounds, dibutyltin compounds, dioctyltin compounds), and the like.
Reaction product of dibutyltin oxide and phthalate ester,
Dialkylstanoxan dicarboxylate,
Dialkyltin alcoholates, such as dibutyltin dimethoxydo,
(Dialkylstanoxane) disiculate compound,
Dialkyltin compounds such as dialkyltin chelate, such as dibutyltin diacetylacetonate;
Tetravalent monoalkyl tin compounds such as monobutyl tin trisoctate, monobutyl tin triisopropoxide, monooctyl tin compounds, etc.;
Examples thereof include divalent tin compounds such as tin octylate, tin naphthenate, tin stearate and the like.

-Content of the curing catalyst (C) The content of the curing catalyst (C) is excellent in weather resistance, excellent in elongation of the obtained cured product, and the viscosity of the composition is in an appropriate range. The amount is preferably 0.1 to 20 parts by mass, preferably 0.1 to 5.0 parts by mass, based on 100 parts by mass of the total of the polymer (A) and the polyoxyalkylene polymer (B). More preferred.

(Resin hollow body)
The composition of the present invention preferably further contains a resin hollow body (resin balloon) from the viewpoint of excellent workability.

The outer shell of the resin hollow body is made of resin, and the inside is hollow.
The resin hollow body can function as a filler.
Examples of the material of the outer shell of the resin-based hollow body include phenol resin; urea resin; polystyrene-based resin; polyvinylidene chloride; acrylonitrile copolymer (for example, a copolymer of acrylonitrile and methacrylonitrile, and acrylonitrile and acrylonitrile. Examples thereof include copolymerizable butadiene, a copolymer with a vinyl-based monomer such as styrene), and a thermoplastic resin such as a vinylidene chloride polymer.
The material of the outer shell of the resin-based hollow body is preferably an acrylonitrile copolymer from the viewpoint of excellent weather resistance and excellent workability.
The average particle size of the resin-based hollow body can be 20 μm or more, and is preferably 20 to 70 μm.
The average particle size of the resin hollow body can be measured by a laser diffraction method.
The true specific gravity of the resin-based hollow body is preferably 0.05 to 0.35 from the viewpoint of excellent workability.

The resin hollow body may be expanded by heating. The temperature at which the resin hollow body can start expanding (heat resistant temperature) can be, for example, 100 to 190 ° C.

The resin hollow body may be coated with a filler such as calcium carbonate, talc, or titanium oxide.
The resin hollow body is preferably coated with the filler from the viewpoint of excellent weather resistance and workability.

The method for producing the resin-based hollow body is not particularly limited, and the resin-based hollow body can be produced by a conventionally known method.
Examples of commercially available products of the resin hollow body include MFL-60CAS manufactured by Matsumoto Yushi Seiyaku Co., Ltd.

The content of the hollow resin body is 1 to 10 parts by mass with respect to 100 parts by mass in total of the vinyl polymer (A) and the polyoxyalkylene polymer (B) from the viewpoint of excellent workability. It is preferably 1 to 5 parts by mass, and more preferably 1 to 5 parts by mass.

(Anti-aging agent)
The composition of the present invention preferably further contains an antioxidant from the viewpoint of excellent weather resistance and excellent elongation of the obtained cured product.

Examples of the antiaging agent include butylhydroxytoluene (BHT), butylhydroxytoluene anisole (BHA), benzotriazole, and 2- (5-chloro-2H-benzotriazole-2-yl) -4-methyl-6-. Examples thereof include tert-butylphenol.

The content of the antiaging agent is 0.1 with respect to a total of 100 parts by mass of the vinyl polymer (A) and the polyoxyalkylene polymer (B) from the viewpoint of excellent prevention of cracks on the surface of the sealing material. It is preferably 10 parts by mass, more preferably 0.1 to 5 parts by mass.

-Plasticizer The composition of the present invention can further contain a plasticizer from the viewpoint of excellent weather resistance and excellent elongation of the obtained cured product.
The plasticizer is not particularly limited. For example, an oxyalkylene polymer and a vinyl polymer can be mentioned. The vinyl polymer (A) or the polyoxyalkylene polymer (B) does not correspond to the plasticizer.

Examples of the oxyalkylene polymer include polyoxyalkylene polyols such as polyethylene glycol and polypropylene glycol.

Examples of the vinyl polymer include (meth) acrylic oligomers.

The number average molecular weight of the oxyalkylene polymer or vinyl polymer is preferably 1,500 to 15,000 from the viewpoint of excellent weather resistance and excellent elongation of the obtained cured product.
The weight average molecular weight of the oxyalkylene polymer or vinyl polymer is preferably 1,500 to 15,000 from the viewpoint of excellent weather resistance and excellent elongation of the obtained cured product.
The number average molecular weight or the weight average molecular weight is a standard polystyrene-equivalent value based on a value measured by gel permeation chromatography (GPC) using tetrahydrofuran (THF) as a solvent.

.. Content of plasticizer The content of the plasticizer is that of the vinyl polymer (A) and the polyoxyalkylene polymer (B) from the viewpoint of excellent weather resistance and excellent elongation of the obtained cured product. It is preferably 1 to 100 parts by mass, and more preferably 30 to 60 parts by mass with respect to 100 parts by mass in total.

-Additives The composition of the present invention can further contain additives. Examples of the additive include a filler such as calcium carbonate (excluding the resin hollow body), titanium oxide, a silane coupling agent, an adhesion-imparting agent, a sagging agent, an ultraviolet absorber, an antioxidant, and the like. Pigments can be mentioned.
The content of the filler (excluding the resin hollow body) is 10 to 300 parts by mass with respect to 100 parts by mass in total of the vinyl polymer (A) and the polyoxyalkylene polymer (B). It is preferable to have.

-Silane coupling agent The composition of the present invention preferably further contains a silane coupling agent from the viewpoint of excellent curability, adhesiveness or storage stability.
Examples of the silane coupling agent include a vinyl group-containing silane coupling agent, an amino group and / or imino group-containing silane coupling agent, a (meth) acrylic loyl group-containing silane coupling agent, and a mercapto group-containing silane coupling agent. , Isocyanate group-containing silane coupling agent.

The content of the silane coupling agent is 100 parts by mass in total of the vinyl polymer (A) and the polyoxyalkylene polymer (B) from the viewpoint of excellent curability, adhesiveness, and storage stability. , 0.1 to 10 parts by mass, more preferably 0.1 to 5 parts by mass.

(Production method)
The method for producing the composition of the present invention is not particularly limited. For example, the composition of the present invention can be produced by mixing the above-mentioned essential components with optional components that can be used as needed.

(Applicable base material)
The base material to which the composition of the present invention can be applied is not particularly limited. For example, metal, plastic, rubber, glass, concrete, tile, stone and the like can be mentioned.
The method of applying the composition of the present invention to a substrate is not particularly limited.

(Curing)
The compositions of the present invention can be cured when used in the presence of moisture. The above moisture is not particularly limited. For example, the humidity in the air.
The temperature conditions for using or curing the composition of the present invention can be, for example, room temperature conditions.

(Use)
Applications of the compositions of the present invention include, for example, sealants (eg, for construction), adhesives, and coatings.

Hereinafter, the present invention will be specifically described with reference to examples. However, the present invention is not limited to these.
<Manufacturing of vinyl polymer (A)>
Each vinyl polymer (A) was produced as follows. The unit "parts" of the amount of the components used in the following production means "parts by mass".

-Vinyl polymer (A-1)
50 parts of methyl ethyl ketone was charged into the reaction vessel, and the temperature was raised to 60 ° C. with stirring. 1.86 parts of n-butyl acrylate and 1.86 parts of γ-methacryloxypropylmethyldimethoxysilane (trade name: KBM-502, manufactured by Shin-Etsu Chemical Co., Ltd., the same shall apply hereinafter) were added dropwise thereto, and the inside of the reaction vessel was stirred while stirring. Nitrogen substituted. Next, 1.40 parts of γ-mercaptopropylmethyldimethoxysilane (trade name: KBM-802, manufactured by Shin-Etsu Chemical Co., Ltd., the same applies hereinafter) was added, and after stirring for 30 minutes, 2,2'-azobisisobutyronitrile (trade name: KBM-802) was added. Manufactured by Tokyo Chemical Industry Co., Ltd. The same applies hereinafter) 0.05 part was added. Then, 0.5 part of 2,2'-azobisisobutyronitrile was added every 30 minutes 4 times. Further, the reaction was carried out for 4 hours while maintaining the temperature in the reaction vessel to obtain a vinyl polymer solution. The solvent was removed from the vinyl polymer solution with an evaporator to obtain a vinyl polymer (A-1).

-Vinyl polymer (A-2)
50 parts of methyl ethyl ketone was charged into the reaction vessel, and the temperature was raised to 60 ° C. with stirring. To this, 100 parts of n-butyl acrylate and 1.24 parts of γ-methacryloxypropylmethyldimethoxysilane were added dropwise, and the inside of the reaction vessel was replaced with nitrogen while stirring. Next, 0.90 part of γ-mercaptopropylmethyldimethoxysilane was added, and after stirring for 30 minutes, 0.05 part of 2,2'-azobisisobutyronitrile was added. Then, 0.5 part of 2,2'-azobisisobutyronitrile was added every 30 minutes 4 times. Further, the reaction was carried out for 4 hours while maintaining the temperature in the reaction vessel to obtain a vinyl polymer solution. The solvent was removed from the vinyl polymer solution with an evaporator to obtain a vinyl polymer (A-2).

-Vinyl polymer (A-3)
50 parts of methyl ethyl ketone was charged into the reaction vessel, and the temperature was raised to 60 ° C. with stirring. 100 parts of n-butyl acrylate and 0.74 part of γ-methacryloxypropylmethyldimethoxysilane were added dropwise thereto, and the inside of the reaction vessel was replaced with nitrogen while stirring. Next, 0.80 part of γ-mercaptopropylmethyldimethoxysilane was added, and after stirring for 30 minutes, 0.05 part of 2,2'-azobisisobutyronitrile was added. Then, 0.5 part of 2,2'-azobisisobutyronitrile was added every 30 minutes 4 times. Further, the reaction was carried out for 4 hours while maintaining the temperature in the reaction vessel to obtain a vinyl polymer solution. The solvent was removed from the vinyl polymer solution with an evaporator to obtain a vinyl polymer (A-3).

・ (Comparison) Vinyl polymer (A-4)
50 parts of methyl ethyl ketone was charged into the reaction vessel, and the temperature was raised to 80 ° C. with stirring. 100 parts of n-butyl acrylate and 2.40 parts of γ-methacryloxypropylmethyldimethoxysilane were added dropwise thereto, and the mixture was refluxed in the reaction vessel with stirring. Next, 0.05 parts of 2,2'-azobisisobutyronitrile was added. Then, 0.5 part of 2,2'-azobisisobutyronitrile was added every 30 minutes 4 times. Further, the reaction was carried out for 4 hours while maintaining the temperature in the reaction vessel to obtain a vinyl polymer solution. The solvent was removed from the vinyl polymer solution with an evaporator to obtain a (comparative) vinyl polymer (A-4).

・ (Comparison) Vinyl polymer (A-5)
50 parts of methyl ethyl ketone was charged into the reaction vessel, and the temperature was raised to 80 ° C. with stirring. 100 parts of n-butyl acrylate and 3.60 parts of γ-methacryloxypropylmethyldimethoxysilane were added dropwise thereto, and the mixture was refluxed in the reaction vessel with stirring. Next, 0.10 parts of 2,2'-azobisisobutyronitrile was added. Then, 0.1 part of 2,2'-azobisisobutyronitrile was added every 30 minutes 4 times. Further, the reaction was carried out for 4 hours while maintaining the temperature in the reaction vessel to obtain a vinyl polymer solution. The solvent was removed from the vinyl polymer solution with an evaporator to obtain a (comparative) vinyl polymer (A-5).

-Vinyl polymer (A-6)
50 parts of methyl ethyl ketone was charged into the reaction vessel, and the temperature was raised to 60 ° C. with stirring. To this, 100 parts of n-butyl acrylate and 0.9 part of γ-methacryloxypropylmethyldimethoxysilane were added dropwise, and the inside of the reaction vessel was replaced with nitrogen while stirring. Next, 1.2 parts of γ-mercaptopropyltrimethoxysilane was added, and after stirring for 30 minutes, 0.05 part of 2,2'-azobisisobutyronitrile was added. Then, 0.5 part of 2,2'-azobisisobutyronitrile was added every 30 minutes 4 times. Further, the reaction was carried out for 4 hours while maintaining the temperature in the reaction vessel to obtain a vinyl polymer solution. The solvent was removed from the vinyl polymer solution with an evaporator to obtain a vinyl polymer (A-6).

-Vinyl polymer (A-7)
50 parts of methyl ethyl ketone was charged into the reaction vessel, and the temperature was raised to 60 ° C. with stirring. To this, 100 parts of n-butyl acrylate and 0.8 part of γ-methacryloxypropyltrimethoxysilane were added dropwise, and the inside of the reaction vessel was replaced with nitrogen while stirring. Next, 1.24 parts of γ-mercaptopropylmethyldimethoxysilane was added, and after stirring for 30 minutes, 0.05 part of 2,2'-azobisisobutyronitrile was added. Then, 0.5 part of 2,2'-azobisisobutyronitrile was added every 30 minutes 4 times. Further, the reaction was carried out for 4 hours while maintaining the temperature in the reaction vessel to obtain a vinyl polymer solution. The solvent was removed from the vinyl polymer solution with an evaporator to obtain a vinyl polymer (A-7).

・ (Comparison) Vinyl polymer (A-8)
50 parts of methyl ethyl ketone was charged into the reaction vessel, and the temperature was raised to 60 ° C. with stirring. 100 parts of n-butyl acrylate and 5 parts of γ-methacryloxypropylmethyldimethoxysilane were added dropwise thereto, and the inside of the reaction vessel was replaced with nitrogen while stirring. Next, 4 parts of γ-mercaptopropylmethyldimethoxysilane was added, and after stirring for 30 minutes, 0.05 part of 2,2'-azobisisobutyronitrile was added. Then, 0.5 part of 2,2'-azobisisobutyronitrile was added every 30 minutes, 4 times. Further, the reaction was carried out for 4 hours while maintaining the temperature in the reaction vessel to obtain a vinyl polymer solution. The solvent was removed from the vinyl polymer solution with an evaporator to obtain a (comparative) vinyl polymer (A-8).

・ (Comparison) Vinyl polymer (A-9)
50 parts of methyl ethyl ketone was charged into the reaction vessel, and the temperature was raised to 60 ° C. with stirring. To this, 100 parts of n-butyl acrylate and 0.15 part of γ-methacryloxypropylmethyldimethoxysilane were added dropwise, and the inside of the reaction vessel was replaced with nitrogen while stirring. Next, 0.89 part of γ-mercaptopropylmethyldimethoxysilane was added, and after stirring for 30 minutes, 0.05 part of 2,2'-azobisisobutyronitrile was added. Then, 0.5 part of 2,2'-azobisisobutyronitrile was added every 30 minutes 4 times. Further, the reaction was carried out for 4 hours while maintaining the temperature in the reaction vessel to obtain a vinyl polymer solution. The solvent was removed from the vinyl polymer solution with an evaporator to obtain a (comparative) vinyl polymer (A-9).

-Details of vinyl polymers (A-1) to (A-9) are summarized in Table 1.
With reference to the column "Number of reactive silyl groups possessed by the vinyl polymer (A) at the terminal" in Table 1, the vinyl polymers (A-1) to (A-3), (A-6) to (A). The above number of -9) is greater than 0. Therefore, in the vinyl polymers (A-1) to (A-3) and (A-6) to (A-9), the molecular chain has a repeating unit made of a polymerizable vinyl monomer, and the molecular chain has a repeating unit. It is considered that the vinyl polymer (a) having a group represented by the above formula (I) is contained at least at the end (one end).

<Manufacturing of polyoxyalkylene polymer (B)>
-Polyoxyalkylene polymer (B-1)
Polyoxypropylene diol having a number average molecular weight of about 2,000 was used as an initiator, and propylene oxide was polymerized with a zinc hexacyanocobaltate glyme complex catalyst to obtain a polyoxypropylene diol having a number average molecular weight of 29,000. A 1.2-fold equivalent of a methanol solution of NaOMe was added to the hydroxyl group of the obtained polyoxypropylene diol to distill off methanol, and a 1.6-fold equivalent of 3-chloro-2-methyl-1-propene was added. Was added to convert the terminal hydroxyl group into a metalyl group. Next, the inside of the container _{was replaced with 6% O 2} / N ₂ , and with respect to 100 parts by weight of the obtained metalyl group-terminated polyoxypropylene polymer, 100 ppm of sulfur (0.25% by weight hexane solution) and platinum divinyl di. 2.30 parts by weight of dimethoxymethylsilane was slowly added dropwise while 100 ppm of a siloxane complex (3% by weight isopropanol solution in terms of platinum) was added and stirred. By reacting the mixed solution at 100 ° C. for 5 hours, a linear reaction in which the terminal is a dimethoxymethylsilyl group, the average number of silicon groups per molecule is 1.9, and the number average molecular weight is 29,000. A polyoxypropylene polymer containing a sex silicon group (polyoxyalkylene polymer (B-1)) was obtained.

-Polyoxyalkylene polymer (B-2)
Polyoxypropylene diol having a number average molecular weight of about 2,000 was used as an initiator, and propylene oxide was polymerized with a zinc hexacyanocobaltate glyme complex catalyst to obtain a polyoxypropylene diol having a number average molecular weight of 29,000. A methanol solution of NaOMe equivalent to 1.2 times the hydroxyl group of the obtained polyoxypropylene diol was added to distill off methanol, and 3-chloro-1-propene was further added to make the terminal hydroxyl group an allyl group. Converted to. Next, 36 ppm of a platinum divinyldisiloxane complex (3 wt% isopropanol solution in terms of platinum) was added to 100 parts by weight of the obtained allyl group-terminated polyoxypropylene polymer, and TES (triethoxysilane) 1 was added with stirring. .48 parts by weight was slowly added dropwise and reacted at 90 ° C. for 2 hours. Further, by adding 20 parts by weight of methanol and 12 ppm of HCl to convert the ethoxy group at the terminal into a methoxy group, the terminal is a trimethoxysilyl group, the average number of silicon groups per molecule is 1.6, and the number average molecular weight is increased. A linear reactive silicon group-containing polyoxypropylene polymer (polyoxyalkylene polymer (B-2)) of 29,000 was obtained.

(Comparison) Polyoxyalkylene polymer (B-3)
A polyoxypropylene diol having a number average molecular weight of 8,400 was obtained by polymerizing propylene oxide using a zinc hexacyanocobaltate glyme complex catalyst using a polyoxypropylene diol having a number average molecular weight of 2,000 as an initiator. Subsequently, 1.2 times equivalent of a methanol solution of NaOMe was added to the hydroxyl group of the hydroxyl group-terminated polyoxypropylene glycol to distill off methanol, and 1.6 times equivalent of 3-chloro-1-propene was further added. The terminal hydroxyl group was converted to an allyl group. Next, 36 ppm of a platinum divinyldisiloxane complex (3 wt% isopropanol solution in terms of platinum) was added to 100 parts by weight of the obtained allyl group-terminated polyoxypropylene polymer, and dimethoxymethylsilane was added to the allyl group while stirring. 0.9 equivalents were added dropwise. The mixed solution was reacted at 90 ° C. for 2 hours, and then the unreacted dimethoxymethylsilane was distilled off under reduced pressure. As a result, the terminal was a dimethoxymethylsilyl group and the average number of silicon groups per molecule was 1.5. , A linear reactive silicon group-containing polyoxypropylene-based polymer having a number average molecular weight of 8,900 ((comparative) polyoxyalkylene polymer (B-3)) was obtained.

<Manufacturing of composition>
Each component in Table 2 below was used in the composition (part by mass) shown in the same table, and these were mixed with a stirrer to prepare a composition.

<Evaluation>
The following evaluation was performed using the composition produced as described above. The results are shown in Table 2.
-Viscosity Using a B-type viscometer (manufactured by Toki Sangyo Co., Ltd., No. 7 rotor), the initial viscosity of the composition produced as described above was measured under the conditions of a rotation speed of 1 rpm and 23 ° C. (Unit: Pa).・ S).
In the present invention, when the viscosity of the composition is 2,000 to 4,000 Pa · s, it can be said that the viscosity of the composition is appropriate.
In the present invention, the viscosity of the composition is preferably 2,000 to 4,000 Pa · s from the viewpoint of workability.

-Initial break elongation ... Sample preparation The composition prepared as described above was cured under the conditions of 23 ° C. and 50% RH (relative humidity) for 7 days. Then, a JIS No. 3 dumbbell-shaped sample (initial sample) having a thickness of 2 mm was punched out from the obtained cured product.

Tensile test Using each initial sample prepared as described above, according to JIS K6251: 2010 (vulcanized rubber and thermoplastic rubber-how to determine tensile properties), tensile speed 500 mm / min, room temperature conditions The tensile test was carried out in 1 and the initial elongation at break (unit%) was measured.

-Evaluation Criteria for Initial Breaking Elongation In the present invention, when the initial breaking elongation is 300% or more, the breaking elongation is considered to be excellent.

-Weather resistance ... Sample preparation The composition prepared as described above was cured under the conditions of 23 ° C. and 50% RH (relative humidity) for 7 days. Then, a sample having a thickness of 5 mm was prepared from the obtained cured product.

· Using each sample prepared as weathering test above, a metal halide weatherometer: According to (condition 63 ° C., to shower for 120 seconds water every 50% RH, light energy 75 mW / cm ² .2 hours.) A weather resistance test was conducted in which the treatment was carried out for 500 hours or 750 hours.

・ ・ Evaluation Criteria After the above weather resistance test, each sample was visually observed to confirm the presence or absence of cracks.
When there were no cracks in the sample, it was evaluated as having very excellent weather resistance, and this was indicated as "A".
When the sample had cracks that could barely be seen visually, it was evaluated as having a slightly excellent weather resistance, and this was indicated as "B".
If there was a crack that was clearly visible in the sample visually, it was evaluated that the weather resistance was rather poor, and this was indicated as "C".
When the sample had a large crack (crack width 0.5 mm to 1.0 mm), it was evaluated that the weather resistance was very poor, and this was indicated as "D".

The details of each component shown in Table 2 are as follows.
-Vinyl polymers (A-1) to (A-9): Vinyl polymers (A-1) to (A-9) produced as described above.

Polyoxyalkylene polymers (B-1) to (B-3) :: Polyoxyalkylene polymers (B-1) to (B-3) produced as described above.

・ Colloidal calcium carbonate: Calfine 200M, manufactured by Maruo Calcium Co., Ltd. ・ Heavy calcium carbonate: Ryton A-4, manufactured by Bihoku powder processing company ・ Titanium oxide: R820, manufactured by Ishihara Sangyo Co., Ltd.

-Plasticizer 1: Acrylic oligomer, UP1000, manufactured by Toagosei Co., Ltd. Number average molecular weight 2,500
-Plasticizer 2: Polypropylene glycol, Preminol 4002, manufactured by Asahi Glass Co., Ltd. Number average molecular weight 4,000

-Silane 1: Vinyl trimethoxysilane, KBM-1003, manufactured by Shin-Etsu Chemical Co., Ltd.-Silane 2: N-2- (aminoethyl) -3-aminopropyltrimethoxysilane, KBM-603, manufactured by Shin-Etsu Chemical Co., Ltd.

-Resin hollow body: A plastic microballoon whose shell composition is an acrylonitrile-based copolymer and is coated with calcium carbonate. Product name MFL-60CAS, Matsumoto Yushi Pharmaceutical Co., Ltd. Average particle size 60 μm. Heat resistant temperature 140-150 ° C.

-Curing catalyst (C): Dibutyl tin diacetylacetonate (trade name: Neostan U-220, manufactured by Nitto Kasei Co., Ltd.)

-Anti-aging agent: 2- (5-chloro-2H-benzotriazole-2-yl) -4-methyl-6-tert-butylphenol, trade name: Chinubin 326, manufactured by BASF.

As is clear from the results shown in Table 2, Comparative Example 1 containing no predetermined vinyl polymer (A) has very poor weather resistance (particularly, weather resistance after 500 hours), and immediately after the start of the weather resistance test. Deteriorated.
Comparative Examples 2 and 3 which did not contain the predetermined vinyl polymer (A) and instead contained the vinyl polymer which did not contain the vinyl polymer (a) had poor weather resistance.
Comparative Example 4 which did not contain the predetermined vinyl polymer (A) and instead contained a vinyl polymer whose weight average molecular weight and / or number average molecular weight was out of the predetermined range had poor weather resistance.
Comparative Example 5 which did not contain the predetermined polyoxyalkylene polymer (B) and instead contained the polyoxyalkylene polymer whose number average molecular weight was out of the predetermined range had poor weather resistance.
Comparative Example 6 which does not contain the predetermined vinyl polymer (A) and instead contains a vinyl polymer in which the total number of reactive silyl groups and / or the number of reactive silyl groups in the side chain is out of the predetermined range. Had poor weather resistance.

On the other hand, the composition of the present invention was excellent in weather resistance.

Claims (19)

It has a reactive silyl group at the end and side chains of the molecular chain, the molecular chain has a repeating unit with a polymerizable vinyl monomer, and the repeating unit is a repeating unit with a (meth) acrylate monomer.
On average, the total number of reactive silyl groups per molecule is more than 1 and less than 1.80, the number of reactive silyl groups at the ends is more than 0.5, and the reaction has in the side chain. The number of sex silyl groups exceeds 0.5,
A vinyl polymer (A) having a weight average molecular weight of 30,000 to 110,000, a number average molecular weight of 9,000 to 40,000, and a glass transition temperature of -100 to -10 ° C.
Have reactive silyl group, a molecular chain Gapo polyoxyalkylene, and a number average molecular weight of 10,000 to 50,000 polyoxyalkylene polymer (B), and
Contains a curing catalyst (C)
The vinyl polymer (A) is a vinyl polymer (a) having a repeating unit whose molecular chain is made of a polymerizable vinyl monomer and having a group represented by the following formula (I) at the end of the molecular chain. seen containing a repeating unit by the repeating unit (meth) acrylate monomer in the molecular chain of the vinyl polymer (a) has,
The content of the oxyalkylene group constituting the polyoxyalkylene contained in the polyoxyalkylene polymer (B) is 50% by mass or more with respect to the total of the repeating units of the polyoxyalkylene polymer (B).
A curable resin composition in which the mass ratio (A: B) of the vinyl polymer (A) to the polyoxyalkylene polymer (B) is 30:70 to 70:30.
* -SL ^1- X ¹ (I)
In formula (I), S is a sulfur atom, L ¹ represents a divalent linking group, X ¹ represents a reactive silyl group, and * represents a bond position. The curing catalyst (C) is at least one selected from the group consisting of tin compounds, titanium compounds, acidic compounds and amine compounds.
The content of the curing catalyst (C) is, per 100 parts by weight of the vinyl polymer (A) and the polyoxyalkylene polymer (B), from 0.1 to 20 parts by weight, claim 1 the curable resin composition according to. The curable resin composition according to claim 1 or 2 , further comprising a resin hollow body. The curable resin composition according to any one of claims 1 to 3 , further comprising an anti-aging agent. Further, it contains at least one plasticizer of an oxyalkylene polymer and a vinyl polymer having a number average molecular weight of 1,500 to 15,000.
Any of claims 1 to 4 , wherein the content of the plasticizer is 1 to 100 parts by mass with respect to a total of 100 parts by mass of the vinyl polymer (A) and the polyoxyalkylene polymer (B). The curable resin composition according to item 1. The curable resin composition according to any one of claims 1 to 5 , wherein the vinyl polymer (A) has a weight average molecular weight of 45,000 to 90,000. The curable resin composition according to any one of claims 1 to 6 , wherein the vinyl polymer (A) has a number average molecular weight of more than 10,000 and less than 20,000. Any of claims 1 to 7, wherein in the vinyl polymer (A), a part of the repeating units constituting the molecular chain is a repeating unit made of a (meth) acrylate monomer having a reactive silyl group. The curable resin composition according to item 1. The curing according to any one of claims 1 to 8, wherein the ester residue of the (meth) acrylate monomer in the vinyl polymer (A) has a hydrocarbon group having 1 to 12 carbon atoms. Sex resin composition. The curable resin composition according to any one of claims 1 to 9 , wherein the molecular chain of the vinyl polymer (A) is linear. The curable resin composition according to any one of claims 1 to 10 , wherein the reactive silyl group as ^{X 1} in the formula (I) is a dialkoxysilyl group. The item according to any one of claims 1 to 11 , wherein the molecular chain of the vinyl polymer (A) has a repeating unit represented by the following formula (II) and a repeating unit represented by the formula (III). Curable resin composition.

In formula (II), R ^2-1 represents a hydrogen atom or a monovalent hydrocarbon group, L ² represents an ester bond , and R ^2-2 represents a monovalent hydrocarbon group.
In formula (III), R ^3-1 represents a hydrogen atom or a monovalent hydrocarbon group, L ³ represents a divalent linking group having at least an ester bond ^{, and R 3-2} and R ^3-3 are respectively. It independently represents a monovalent hydrocarbon group, m3 is 1-3, n3 is 0-2, and m3 + n3 is 3. The curable resin composition according to claim 12 , wherein in the formula (III), m3 is 2 and n3 is 1. The curable resin composition according to any one of claims 1 to 13 , wherein the group represented by the formula (I) is a group represented by the following formula (I-1).

In formula (I-1), R ^1-1 represents a divalent hydrocarbon group, R ^1-2 and R ^1-3 each independently represent a monovalent hydrocarbon group, and m1 is 1-3. Yes, n1 is 0-2, m1 + n1 is 3, and * represents the coupling position. The curable resin composition according to claim 14 , wherein in the formula (I-1), m1 is 2 and n1 is 1. The curable resin composition according to any one of claims 1 to 15 , wherein the vinyl polymer (a) has one terminal having a group represented by the formula (I). Any of claims 1 to 16, wherein in the vinyl polymer (a), a part of the repeating units constituting the molecular chain is a repeating unit made of a (meth) acrylate monomer having a reactive silyl group. The curable resin composition according to item 1. The curability according to any one of claims 1 to 17 , wherein in the vinyl polymer (A), the reactive silyl group at the end of the molecular chain is a group represented by the following formula (V). Resin composition.
* -S-L ^1- X ¹ (V)
In formula (V), S is a sulfur atom, L ¹ represents a divalent linking group, X ¹ represents a reactive silyl group, and * represents a bond position. The vinyl polymer (A), any one of claims 1 to 18 , wherein at least one of the reactive silyl group at the terminal and the reactive silyl group at the side chain is a dialkoxysilyl group. The curable resin composition according to item 1.