JP2024021876A - curable composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a curable composition containing a reactive silicon group-containing organic polymer that exhibits favorable fast curability in spite of containing a non-organic tin-based curing catalyst.

SOLUTION: In a curable composition containing an organic polymer having a reactive silicon group, a curing catalyst is used that contains a specific amidine compound (b1), a specific titanium compound (b2), and a salicylic acid ester (b3). The amidine compound (b1) is 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU). The titanium compound (b2) is a compound represented by Ti(OR²)_dY_4-d, where R² is a hydrocarbon group with 1 to 20 carbon atoms that may be substituted, Y is a chelating coordination compound, and d is an integer from 0 to 4.

SELECTED DRAWING: None

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention provides an organic polymer having a hydroxyl group or a hydrolyzable group bonded to a silicon atom and having a silicon group (hereinafter also referred to as a "reactive silicon group") that can form a crosslink by forming a siloxane bond. The present invention relates to a curable composition containing the organic polymer.

An organic polymer having at least one reactive silicon group in its molecule can be crosslinked even at room temperature by forming a siloxane bond accompanied by a hydrolysis reaction of a silyl group due to moisture or the like. It is known that organic polymers having reactive silicon groups have the property of providing rubber-like cured products through such crosslinking reactions.

As organic polymers having these reactive silicon groups, organic polymers whose main chain structure is polyoxyalkylene, polyacrylic acid ester, or polyisobutylene have already been produced industrially and are used as sealants, adhesives, paints, It is widely used in applications such as waterproofing materials (Patent Document 1), (Patent Document 2), (Patent Document 3 (MA)), (Patent Document 4 (XMAP)).

When organic polymers containing reactive silicon groups are used as curable compositions for sealants, adhesives, paints, waterproof materials, etc., there are various problems such as curability, adhesion, workability, mechanical properties of cured products, waterproofness, etc. The following characteristics are required for the curable composition.

A curable composition containing an organic polymer having a reactive silicon group is usually prepared using a silanol condensation catalyst such as an organotin compound having a carbon-tin bond, typified by dibutyltin bis(acetylacetonate). Let it harden. Silanol condensation catalysts are also referred to as curing catalysts. In recent years, the toxicity of organotin compounds has been pointed out, and care must be taken when using them from the viewpoint of environmental safety.

Therefore, as curing catalysts other than organotin compounds, it has been proposed to use tin carboxylate salts, other metal carboxylates, organic salts using a combination of carboxylic acids and amine compounds, and metal complexes such as titanium compounds ( Patent Document 3), (Patent Document 4), (Patent Document 5), (Patent Document 6).

Japanese Unexamined Patent Publication No. 52-73998 Japanese Unexamined Patent Publication No. 63-6041 Japanese Patent Application Publication No. 55-9669 JP2003-206410A Japanese Patent Application Publication No. 5-117519 International Publication No. 2005/108499

However, the above-mentioned conventional techniques have room for improvement in terms of rapid curing of the curable composition.

Therefore, an object of the present invention is to provide a curable composition containing a reactive silicon group-containing organic polymer that exhibits good rapid curing properties even when it contains a non-organic tin-based curing catalyst.

As a result of intensive studies to solve the above problems, the present inventors have found that a curable composition exhibiting rapid curing properties can be obtained by using an organic polymer having a reactive silicon group and a specific curing catalyst. This discovery led to the completion of the present invention.

That is, the present invention
A curable composition comprising an organic polymer (A) and a curing catalyst (B),
The organic polymer (A) has the following formula (1):
-SiR ¹ _3-a X _a (1)
(In formula (1), R ¹ represents a substituted or unsubstituted hydrocarbon group having 1 to 20 carbon atoms, or a triorganosiloxy group represented by R ⁰ ₃ SiO-, and three R ⁰ are A hydrocarbon group having 1 to 20 carbon atoms, which may be the same or different,
X represents a hydroxyl group or a hydrolyzable group,
a is 1, 2, or 3;
When a plurality of R ¹ and X exist, they may be the same or different. )
It has a reactive silicon group represented by
The curing catalyst (B) contains an amidine compound (b1), a titanium compound (b2), and a salicylic acid ester (b3),
Amidine compound (b1) is 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU),
The titanium compound (b2) has the following formula (2):
Ti(OR ² ) _d Y _4-d (2)
(In formula (2), R ² is a hydrocarbon group having 1 to 20 carbon atoms that may have a substituent, Y is a chelate coordination compound, and d is an integer of 0 to 4. )
It is a compound represented by
The present invention relates to a curable composition in which two or more selected from the amidine compound (b1), the titanium compound (b2), and the salicylic acid ester (b3) may react with each other.

According to the present invention, it is possible to provide a curable composition containing a reactive silicon group-containing organic polymer that exhibits good rapid curing properties even if it contains a non-organic tin curing catalyst.

The present invention will be explained in detail below.

≪Curable composition≫
The curable composition contains an organic polymer (A) and a curing catalyst (B).
The organic polymer (A) has the following formula (1):
-SiR ¹ _3-a X _a (1)
(In formula (1), R ¹ represents a substituted or unsubstituted hydrocarbon group having 1 to 20 carbon atoms, or a triorganosiloxy group represented by R ⁰ ₃ SiO-, and three R ⁰ are A hydrocarbon group having 1 to 20 carbon atoms, which may be the same or different,
X represents a hydroxyl group or a hydrolyzable group,
a is 1, 2, or 3;
When a plurality of R ¹ and X exist, they may be the same or different. )
It has a reactive silicon group represented by
The curing catalyst (B) contains an amidine compound (b1), a titanium compound (b2), and a salicylic acid ester (b3).

Amidine compound (b1) is 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU).
The titanium compound (b2) has the following formula (2):
Ti(OR ² ) _d Y _4-d (2)
(In formula (2), R ² is a hydrocarbon group having 1 to 20 carbon atoms that may have a substituent, Y is a chelate coordination compound, and d is an integer of 0 to 4. )
It is a compound represented by
In the curable composition, two or more selected from the amidine compound (b1), the titanium compound (b2), and the salicylic acid ester (b3) may react with each other.
The above curable composition exhibits excellent fast curing properties.

Hereinafter, essential or optional components that the curable composition may contain will be explained.

<Organic polymer (A)>
The organic polymer has a reactive silicon group with a predetermined structure described below. The organic polymer (A) has a polymer skeleton and a polymer chain terminal bonded to the polymer skeleton. In the specification and claims of this application, the polymer skeleton is also referred to as a "main chain structure." A polymer skeleton is a structure in which a plurality of structural units derived from monomers are continuously bonded. There may be one type of monomer or multiple types of monomers.

The terminus of the polymer chain is a site located at the end of the organic polymer (A). The number of polymer chain terminals of the organic polymer (A) is 2 when the main chain structure is linear, and is 3 or more when the polymer skeleton is branched. When the organic polymer (A) is a mixture of a polymer having a linear main chain structure and a polymer having a branched main chain structure, the number of polymer chain terminals is as an average value. It is a number between 2 and 3.

Reactive silicon groups can be present in the polymer backbone and at the polymer chain ends. Also, two or more reactive silicon groups may be present at the end of the polymer chain. When using the curable composition for adhesives, sealants, elastic coatings, adhesives, etc., the reactive silicon group is preferably present at the end of the polymer chain in the organic polymer (A). .

The organic polymer (A) is not particularly limited as long as it is an organic polymer having a reactive silicon group represented by the following formula (1).

-SiR ¹ _3-a X _a (1)
(In formula (1), R ¹ is a substituted or unsubstituted hydrocarbon group having 1 to 20 carbon atoms, or a triorganosiloxy group represented by R ⁰ ₃ SiO-. Three R ⁰ are It is a hydrocarbon group having 1 to 20 carbon atoms. The three R ⁰ 's may be the same or different. X is a hydroxyl group or a hydrolyzable group. a is 1, 2, or 3. When a plurality of R ¹ or X exists, the plurality of R ¹ or the plurality of X may be the same or different.)

Specific examples of R ¹ in formula (1) include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, tert-butyl group, n-hexyl group, 2-ethylhexyl group, and n - Alkyl groups such as dodecyl groups; unsaturated hydrocarbon groups such as vinyl groups, isopropenyl groups, and allyl groups; alkoxymethyl groups such as methoxymethyl; halogenated methyl groups such as chloromethyl groups; cycloalkyl groups such as cyclohexyl groups Groups; aryl groups such as phenyl, tolyl, and 1-naphthyl; aralkyl groups such as benzyl; and the like. Among these groups, alkyl groups and aryl groups are preferred, methyl groups, ethyl groups, and phenyl groups are more preferred, methyl groups and ethyl groups are even more preferred, and methyl groups are particularly preferred. When a plurality of R ^1s exist in formula (1), the plurality of R ^1s may be the same group, or may be a combination of two or more different groups.

X in formula (1) is a hydroxyl group or a hydrolyzable group. The hydrolyzable group is not particularly limited, and may be any known hydrolyzable group. Specific examples of hydrolyzable groups include hydrogen atoms, halogen atoms, alkoxy groups, acyloxy groups, ketoximate groups, amino groups, amide groups, acid amide groups, aminooxy groups, mercapto groups, and alkenyloxy groups. . Among these, alkoxy groups, acyloxy groups, ketoximate groups, and alkenyloxy groups are preferred, and alkoxy groups such as methoxy groups and ethoxy groups are more preferred because they are mildly hydrolyzable and easy to handle.

The reactive silicon group represented by formula (1) is not particularly limited. Specific examples of the reactive silicon group represented by formula (1) include dimethoxymethylsilyl group, diethoxymethylsilyl group, trimethoxysilyl group, triethoxysilyl group, dimethoxyphenylsilyl group, methoxymethyldimethoxysilyl group, Examples include methoxymethyldiethoxysilyl group, triisopropenyloxysilyl group, and triacetoxysilyl group. Among these, dimethoxymethylsilyl group and trimethoxysilyl group are preferred because the organic polymer (A) can be easily synthesized. A trimethoxysilyl group and a methoxymethyldimethoxysilyl group are preferred from the viewpoint of excellent curability.

(About the main chain structure of organic polymer (A))
The main chain structure of the organic polymer (A) is not particularly limited, and may be any of various known main chain structures. Specific examples of the main chain structure include polyoxyethylene polymer, polyoxypropylene polymer, polyoxybutylene polymer, polyoxytetramethylene polymer, polyoxyethylene-polyoxypropylene copolymer, polyoxypropylene-polyoxy Polyoxyalkylene polymers such as butylene copolymers; ethylene-propylene copolymers, polyisobutylene, isobutylene-isoprene copolymers, polybutadiene, and hydrogenated polyolefins in which these polyolefin polymers are hydrogenated. Hydrocarbon polymers such as polymers; polyester polymers such as polycondensates of dibasic acids such as adipic acid and glycol, and ring-opening polymers of lactones; (meth)methyl acrylate, (meth) (Meth)acrylate ester obtained by radical polymerization of (meth)acrylate monomers such as ethyl acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and stearyl (meth)acrylate. Vinyl copolymer obtained by radical polymerization of two or more monomers selected from (meth)acrylic acid ester monomer, vinyl acetate, acrylonitrile, styrene, etc.; polysulfide polymer; Nylon 6, nylon 6/6, nylon 6/10, nylon 11, nylon 12, polyamide polymers such as copolymerized nylons having two or more components among these nylons; diallylphthalate polymers, etc. . Note that (meth)acrylic ester means both acrylic ester and methacrylic ester.

Due to its high moisture permeability, it has excellent deep curability as a one-component composition, and also has excellent adhesive properties, so the main chain structure is composed of polyoxyalkylene polymers and (meth)acrylic acid. Ester polymers are particularly preferred. As for the main chain structure, polyoxyalkylene polymers are more preferred, and polyoxypropylene is even more preferred.

By varying the composition of the monomers that make up the polymer, it is possible to improve adhesion and reduce the heat resistance, weather resistance, and water absorption of the cured product. ) Acrylic acid ester polymers are also useful as main chain structures.
The main chain structure of the organic polymer (A) may be one of the above or a combination of a plurality of them. For example, an organic polymer (A) whose main chain structure is a polyoxypropylene polymer and an organic polymer (A) whose main chain structure is a (meth)acrylic acid ester polymer are uniformly compatible with each other. When melted, it imparts elasticity, mechanical strength, adhesive strength, etc. in a well-balanced manner to the resulting cured product. In this respect, an organic polymer (A) whose main chain structure is a polyoxypropylene polymer and an organic polymer (A) whose main chain structure is a (meth)acrylic acid ester polymer are used in combination. It is also preferable.

The polyoxyalkylene polymer is a polymer having a repeating unit represented by -R ³ -O-. R ³ is a linear or branched alkylene group having 1 to 14 carbon atoms. More preferably, R ³ is a linear or branched alkylene group having 2 to 4 carbon atoms. Specific examples of the repeating unit represented by -R ³ -O- include -CH ₂ O-, -CH ₂ CH ₂ O-, -CH ₂ CH(CH ₃ )O-, -CH ₂ CH(C ₂ Examples include H ₅ )O-, -CH ₂ C(CH ₃ )(CH ₃ )O-, and -CH ₂ CH ₂ CH ₂ CH ₂ O-. The main chain structure of the polyoxyalkylene polymer may consist of only one type of repeating unit, or may consist of two or more types of repeating units. In particular, when the curable composition is used for sealants, adhesives, etc., polyoxypropylene polymers containing oxypropylene repeating units in an amount of 50% by weight or more, preferably 80% by weight or more of the polymer main chain structure are used. is preferable as a polyoxyalkylene polymer. This is because such a polyoxyalkylene polymer is amorphous and has a relatively low viscosity.

The main chain structure of the polyoxyalkylene polymer may be linear or branched.

As the polyoxyalkylene polymer, a polymer obtained by a ring-opening polymerization reaction of a cyclic ether compound using a polymerization catalyst in the presence of an initiator is preferable.

Examples of the cyclic ether compound include ethylene oxide, propylene oxide, butylene oxide, tetramethylene oxide, and tetrahydrofuran. These cyclic ether compounds may be used alone or in combination of two or more.
Among these cyclic ether compounds, propylene oxide is particularly preferred since it can yield an amorphous polyether polymer with relatively low viscosity.

Specific examples of initiators include butanol, ethylene glycol, propylene glycol, propylene glycol monoalkyl ether, butanediol, hexamethylene glycol, neopentyl glycol, diethylene glycol, dipropylene glycol, triethylene glycol, glycerin, trimethylolmethane, and triethylene glycol. Examples include alcohols such as methylolpropane, pentaerythritol, and sorbitol; polyoxyalkylene polymers such as polyoxypropylene diol, polyoxypropylene triol, polyoxyethylene diol, and polyoxyethylene triol.

The method for synthesizing the polyoxyalkylene polymer is not particularly limited. Methods for synthesizing polyoxyalkylene polymers include, for example, a polymerization method using an alkali catalyst such as KOH, and a complex obtained by reacting an organoaluminum compound and porphyrin as shown in JP-A No. 61-215623. Polymerization method using a transition metal compound-porphyrin complex catalyst, Japanese Patent Publication No. 46-27250, Japanese Patent Publication No. 59-15336, US Patent No. 3278457, US Patent No. 3278458, US Patent No. 3278459, US Patent No. 3427256, US Patent 3427334 and U.S. Pat. No. 3427335, etc., a polymerization method using a catalyst consisting of a polyphosphazene salt as exemplified in JP-A-10-273512, and JP-A-11-060722. Examples include a polymerization method using a catalyst made of a phosphazene compound as exemplified in Japanese Patent Publication No. A polymerization method using a multimetal cyanide complex catalyst is more preferable because of the low manufacturing cost and the ability to obtain a polymer with a narrow molecular weight distribution.

The main chain structure of the organic polymer (A) is a polyoxyalkylene polymer containing bonds other than ether bonds such as urethane bonds and urea bonds, as long as the desired effect is not significantly impaired. Good too. Specific examples of polymers having such a main chain structure include polyurethane prepolymers and polyurea prepolymers.

A polyurethane prepolymer can be obtained by a known method such as a method of reacting a polyol compound and a polyisocyanate compound. The polyurea prepolymer can be obtained by a known method such as a method of reacting a polyamine compound and a polyisocyanate compound.
The main chain structure may be a prepolymer having a combination of urethane bonds and urea bonds, which is obtained by reacting a polyol compound and a polyamine compound with a polyisocyanate compound.

Specific examples of polyol compounds include polyether polyols, polyester polyols, polycarbonate polyols, and polyether polyester polyols.

Specific examples of the polyisocyanate compound include diphenylmethane diisocyanate, tolylene diisocyanate, xylylene diisocyanate, methylene-bis(cyclohexyl isocyanate), isophorone diisocyanate, and hexamethylene diisocyanate.

The terminal of the polyurethane prepolymer may be either a hydroxyl group or an isocyanate group. The terminal of the polyurea prepolymer may be either an amino group or an isocyanate group.

A cured product of a curable composition containing a polymer having one or more types of bonds selected from urethane bonds, urea bonds, and ester bonds in the main chain structure as the organic polymer (A) may be cured by heat or the like. The strength of the cured product may decrease due to cleavage of urethane bonds, urea bonds, or ester bonds in the main chain structure.

When a polymer containing an amide bond in the main chain structure is used as the organic polymer, the curability of the curable composition may be improved. The amide bond is represented by, for example, -NR ⁴ -C(=O)-. R ⁴ is a hydrogen atom or an organic group which may have a substituent. If the amount of amide bonds in the main chain structure is within an appropriate range, the viscosity of the polymer will be low, and the strength of the cured product will decrease due to cleavage of the amide bonds due to heat, etc., and the viscosity of the curable composition will increase due to storage. The curable composition has good workability.

When the organic polymer (A) contains an amide bond in the main chain structure, the average number of amide bonds per molecule is preferably 1 to 10, more preferably 1.5 to 5, 2 -3 is more preferred. When the average number of amide bonds per molecule is within this range, the curability of the curable composition is good, the viscosity of the organic polymer (A) is low, and the organic polymer (A) and The curable composition is easy to handle.

The organic polymer (A) described above has urethane bonds, urea bonds, ester bonds, and amide bonds in the main chain structure from the viewpoint of obtaining a curable composition with excellent storage stability and workability. The most preferred is a polyoxyalkylene polymer containing no.

The organic polymer (A) is preferably a polymer obtained by introducing a reactive silicon group into the polymer by any of the methods (a) to (d) below.
(a) A method of converting the terminal hydroxyl group of a hydroxyl-terminated organic polymer into a carbon-carbon unsaturated group, and then hydrosilylating the carbon-carbon unsaturated group with a hydrosilane represented by HSiR ¹ _3-a X _a . R ¹ , X, and a are each the same as those in general formula (1).
(b) A method of reacting an isocyanate alkylsilane compound represented by OCN-W-SiR ¹ _3-a X _a with the terminal hydroxyl group of a hydroxyl-terminated organic polymer. W is a divalent organic group. R ¹ , X, and a are each the same as those in general formula (1).
(c) After converting the terminal hydroxyl group of the hydroxyl-terminated organic polymer into a carbon-carbon unsaturated group, a carbon-carbon unsaturated group and a mercaptoalkylsilane compound represented by HS-W-SiR ¹ _3-a X _a A method of carrying out the ene-thiol reaction with. W is a divalent organic group. R ¹ , X, and a are each the same as those in general formula (1).
(d) After reacting a hydroxyl group-terminated organic polymer with a polyisocyanate compound to synthesize an NCO group-terminated organic polymer, the terminal NCO group is converted into HNR ⁵ -W-SiR ¹ _3-a X _a or HS-W- A method of reacting with a silane compound represented by SiR ¹ _3-a X _a . W is a divalent organic group. R ⁵ is a hydrogen atom or an alkyl group. R ¹ , X, and a are each the same as those in general formula (1).

In methods (a) and (c) above, examples of the terminal carbon-carbon unsaturated group include a vinyl group, an allyl group, a methallyl group, an allenyl group, and a propargyl group.

In any of the above methods (b) to (d), the organic polymer (A) obtained using a silane compound in which W is methylene exhibits extremely high curability.

Method (a) is preferred in that it is easy to obtain an organic polymer (A) with good storage stability. Methods (b), (c), and (d) are preferred because they provide a high conversion rate in a relatively short reaction time.

Methods for introducing reactive silicon groups by method (a) include Japanese Patent Publications Nos. 45-36319, 46-12154, 50-156599, 54-6096, 55-13767, 55-13468, 57-164123, Japanese Patent Publication No. 3-2450, US Pat. No. 3,632,557, US Pat. No. 4,345,053, US Pat. No. 4,366,307, and US Pat. No. 4,960,844. The number average molecular weight is 6,000 or more and Mw/Mn is 1.6 or less as proposed in JP-A-61-197631, JP-A-61-215622, JP-A-61-215623, and JP-A-61-218632. Examples include a method of introducing a reactive silicon group into a polyoxypropylene polymer having a high molecular weight and a narrow molecular weight distribution by hydrosilylation, and a method proposed in JP-A-3-72527.

The number average molecular weight of the organic polymer (A) is not particularly limited. The number average molecular weight of the organic polymer (A) is preferably 3,000 to 100,000, more preferably 3,000 to 50,000, particularly preferably 3,000 to 30,000 as a polystyrene equivalent molecular weight in GPC. . When the number average molecular weight is within the above range, the amount of hydrolyzable silyl groups introduced is appropriate, so the production cost can be kept within an appropriate range, and the polymer has an easy-to-handle viscosity and excellent workability. (A) is easy to obtain.

The polymer precursor before the introduction of hydrolyzable silyl groups is directly subjected to titration analysis based on the principles of the hydroxyl value measurement method specified in JIS K 1557 and the iodine value measurement method specified in JIS K 0070. The molecular weight of the organic polymer (A) can also be expressed as the terminal group equivalent molecular weight determined by measuring the terminal group concentration and taking into account the structure of the polymer (the degree of branching determined by the polymerization initiator used). The molecular weight of the organic polymer (A) in terms of terminal groups is determined by creating a calibration curve between the number average molecular weight determined by general GPC measurement of the polymer precursor and the above molecular weight in terms of terminal groups. It is also possible to calculate the number average molecular weight determined by converting it into an end group equivalent molecular weight.

The molecular weight distribution (Mw/Mn) of the organic polymer (A) is not particularly limited. It is preferable that the organic polymer (A) has a narrow molecular weight distribution. Specifically, the molecular weight distribution is preferably 1.6 or less, more preferably 1.4 or less, still more preferably 1.3 or less, particularly preferably 1.2 or less. The molecular weight distribution of the organic polymer (A) can be determined from the number average molecular weight and weight average molecular weight obtained by GPC measurement.

In order to obtain a good rubber-like cured product, the reactive silicon group of the organic polymer (A) is preferably present at the end of the polymer chain. The average number of reactive silicon groups per polymer chain terminal is preferably 0.5 or more, more preferably 0.6 or more, even more preferably 0.7 or more, and 0.8 or more. Particularly preferred. When the number of reactive silicon groups is 0.5 or more, the organic polymer (A) and the curable composition have good curability, and the cured product of the curable composition has good rubber elasticity.

The average number of reactive silicon groups in one molecule is preferably 1 to 7, more preferably 1 to 4, particularly preferably 1 to 3.

Moreover, as described in WO2013/180203, an organic polymer having two or more reactive silicon groups at the end of a polymer chain can also be used as the organic polymer (A). Such an organic polymer (A) exhibits high curability, and the resulting cured product can be expected to have high strength and high restorability.

Specific examples of commercially available organic polymers (A) include various reactive silicon group-containing polyoxypropylene products such as Kaneka MS Polymer (registered trademark) and Kaneka Cylyl (registered trademark), and Kaneka TA Polymer (registered trademark). and reactive silicon group-containing poly(meth)acrylic acid ester products such as KANEKA XMAP (registered trademark) and reactive silicon group-containing polyisobutylene products such as EPION (registered trademark). These commercially available organic polymers (A) are all products of Kaneka Corporation.

<Curing catalyst (B)>
The curable composition contains a curing catalyst that cures the organic polymer (A) through hydrolytic condensation.
The curing catalyst (B) contains an amidine compound (b1), a titanium compound (b2), and a salicylic acid ester (b3).
Amidine compound (b1) is 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU).
The titanium compound (b2) has the following formula (2):
Ti(OR ² ) _d Y _4-d (2)
(In formula (2), R ² is a hydrocarbon group having 1 to 20 carbon atoms that may have a substituent, Y is a chelate coordination compound, and d is an integer of 0 to 4. )
It is a compound represented by
In the curable composition, two or more selected from the amidine compound (b1), the titanium compound (b2), and the salicylic acid ester (b3) may react with each other.

In terms of non-bleeding, the amount of the amidine compound (b1) used is preferably 0.1 parts by weight or more and 4.0 parts by weight or less, and 0.2 parts by weight, based on 100 parts by weight of the organic polymer (A). It is more preferably 3.0 parts by weight or less, and even more preferably 0.3 parts by weight or more and 2.0 parts by weight or less.

The titanium compound (b2) has the following formula (2):
Ti(OR ² ) _d Y _4-d (2)
(In formula (2), R ² is a hydrocarbon group having 1 to 20 carbon atoms that may have a substituent, Y is a chelate coordination compound, and d is an integer of 0 to 4. )
It is a compound represented by

The hydrocarbon group as R ² may be an aliphatic hydrocarbon group or an aromatic hydrocarbon group. When the hydrocarbon group as R ² is an aliphatic hydrocarbon group, the aliphatic hydrocarbon group may have one or more unsaturated bonds. When the hydrocarbon group as R ² is an aliphatic hydrocarbon group, the structure of the aliphatic hydrocarbon group may be linear, branched, or cyclic. There may be a combination of structures.

The chelate coordination compound as Y is preferably a bidentate organic ligand. Chelate coordination compounds include β-diketones and β-ketoesters.
Specific examples of β-diketones include acetylacetone (ACAC), trifluoroacetylacetone, hexafluoroacetylacetone, benzoylacetone, thenoyltrifluoroacetone, dipivaloylmethane, dibenzoylmethane, and ascorbic acid. Specific examples of β-ketoesters include methyl acetoacetate, ethyl acetoacetate, allyl acetoacetate, benzyl acetoacetate, n-propyl acetoacetate, iso-propyl acetoacetate, n-butyl acetoacetate, and iso-acetoacetate. -butyl, tert-butyl acetoacetate, 2-methoxyethyl acetoacetate, and methyl 3-oxopentanoate.

Specific examples of the titanium compound (b2) include tetramethoxytitanium, trimethoxyethoxytitanium, trimethoxyisopropoxytitanium, trimethoxybutoxytitanium, dimethoxydiethoxytitanium, dimethoxydiisopropoxytitanium, dimethoxydibutoxytitanium, and methoxytritanium. Ethoxytitanium, methoxytriisopropoxytitanium, methoxytributoxytitanium, tetraethoxytitanium, triethoxyisopropoxytitanium, triethoxybutoxytitanium, diethoxydiisopropoxytitanium, diethoxydibutoxytitanium, ethoxytriisopropoxytitanium, ethoxytritanium Butoxytitanium, tetraisopropoxytitanium, triisopropoxybutoxytitanium, diisopropoxydibutoxytitanium, tetrabutoxytitanium, tetratert-butoxytitanium, bis(acetylacetonato) diisopropoxytitanium, bis(ethylacetoacetate) diiso Propoxy titanium, bis(ethyl acetoacetate) diisobutoxy titanium, and the like. From the viewpoint of obtaining good curability, tetraalkoxytitanium is preferred, and tetraisopropoxytitanium is particularly preferred.

From the viewpoint of availability, compatibility with organic polymer (A), and curability, tetraisopropoxytitanium, tetratert-butoxytitanium, bis(acetylacetonato)diisopropoxytitanium, and bis(ethylacetoacetate)di Isopropoxy titanium is more preferred, and tetraisopropoxy titanium, tetra-tert-butoxy titanium, and bis(ethyl acetoacetate) diisopropoxy titanium are particularly preferred. The titanium compound (b2) may be used as a single component or in combination of a plurality of components.
The titanium compound (b2) may be used as a single component or in combination of a plurality of components.

In terms of fast curing properties, the amount of titanium compound (b2) used is preferably 0.1 parts by weight or more and 5.0 parts by weight or less, and 0.5 parts by weight, based on 100 parts by weight of the organic polymer (A). It is more preferably 4.5 parts by weight or less, and even more preferably 1.0 parts by weight or more and 4.0 parts by weight or less.

The organic group bonded to the non-carbonyl oxygen in the ester bond of the salicylic acid ester (b3) is not particularly limited as long as the desired effect is not impaired. Such an organic group may be a hydrocarbon group or an organic group containing a heteroatom such as N, O, S, P, or a halogen atom.
The structure of such an organic group may be linear, branched, cyclic, or a combination thereof. Such organic groups may have one or more unsaturated bonds.
Such an organic group is preferably a hydrocarbon group, more preferably a hydrocarbon group having 1 to 10 carbon atoms, and even more preferably a hydrocarbon group having 1 to 6 carbon atoms.
Specific examples of salicylate esters include methyl salicylate, ethyl salicylate, n-propyl salicylate, isopropyl salicylate, n-butyl salicylate, isobutyl salicylate, n-amyl salicylate, isoamyl salicylate, n-hexyl salicylate, 2-ethylhexyl salicylate, and salicylic acid. Examples include phenyl.
Among these, salicylic acid esters such as methyl salicylate, ethyl salicylate, isopropyl salicylate, isobutyl salicylate, isoamyl salicylate, 2-ethylhexyl salicylate, 3,3,5-trimethylcyclohexyl salicylate, and phenyl salicylate are preferred.
As the salicylic acid ester (b3), a single compound may be used or a plurality of compounds may be used in combination.

In terms of quick curing properties, the amount of salicylic acid ester (b3) used is preferably 0.1 parts by weight or more and 10.0 parts by weight or less, and 0.5 parts by weight, based on 100 parts by weight of the organic polymer (A). It is more preferably 9.0 parts by weight or less, and even more preferably 1.0 parts by weight or more and 8.0 parts by weight or less.

<Other additives>
The curable composition may contain other additives other than the organic polymer (A) and the curing catalyst (B) as long as the desired effect is not impaired. Other additives include silanol condensation catalysts other than the curing catalyst (B), fillers, adhesive agents, plasticizers, solvents, diluents, anti-sagging agents, antioxidants, light stabilizers, ultraviolet absorbers, Physical property modifiers, tackifying resins, compounds containing epoxy groups, photo-curable substances, oxygen-curable substances, epoxy resins, other resins, surface property modifiers, foaming agents, curing modifiers, flame retardants, silicates, Examples include radical inhibitors, metal deactivators, phosphorous peroxide decomposers, lubricants, pigments, and fungicides.

(silanol condensation catalyst)
The curable composition promotes the hydrolysis condensation reaction between the reactive silicon groups possessed by the organic polymer (A), and uses silanol condensation other than the above-mentioned curing catalyst (B) for the purpose of chain extension or crosslinking of the polymer. It may also contain a catalyst. Examples of such condensation catalysts include organic tin compounds, carboxylic acid metal salts, amine compounds, carboxylic acids, metal alkoxides, and inorganic acids.
Two or more different types of silanol condensation catalysts may be used in combination.
The amount of the silanol condensation catalyst used is preferably 0.001 to 20 parts by weight, more preferably 0.01 to 15 parts by weight, and 0.01 to 10 parts by weight based on 100 parts by weight of the organic polymer (A). Particularly preferred.

(filler)
Various fillers may be blended into the curable composition. Examples of fillers include reinforcing fillers such as fumed silica, precipitated silica, crystalline silica, fused silica, dolomite, anhydrous silicic acid, hydrated silicic acid, and carbon black; heavy calcium carbonate, colloidal calcium carbonate, and carbonic acid. Fillers such as magnesium, diatomaceous earth, calcined clay, clay, talc, titanium oxide, bentonite, organic bentonite, ferric oxide, fine aluminum powder, flint powder, zinc oxide, activated zinc white, and resin powder; asbestos, glass Examples include fibrous fillers such as fibers and filaments.
Examples of the resin powder include PVC powder and PMMA powder.
When a filler is used, the amount of filler used is preferably 1 to 300 parts by weight, more preferably 10 to 200 parts by weight, based on 100 parts by weight of the organic polymer (A).

If you want to obtain a cured product with high strength by using these fillers, mainly fumed silica, precipitated silica, crystalline silica, fused silica, dolomite, anhydrous silicic acid, hydrated silicic acid, carbon black, surface Fillers selected from treated finely divided calcium carbonate, calcined clay, clay, activated zinc white, etc. can be preferably used.
From the viewpoint of the strength of the cured product, the amount of these fillers used is preferably 1 to 200 parts by weight per 100 parts by weight of the organic polymer (A). In addition, when it is desired to obtain a cured product with low strength and high elongation at break, fillers mainly selected from titanium oxide, calcium carbonate, magnesium carbonate, talc, ferric oxide, zinc oxide, shirasu balloon, etc. can be preferably used. The amount of these fillers used is preferably 5 to 200 parts by weight based on 100 parts by weight of the organic polymer (A) in terms of elongation at break of the cured product.

The curable composition may include a spherical hollow body such as a balloon for the purpose of reducing the weight (reducing the specific gravity) of the cured product.
A balloon is a spherical filler with a hollow interior. Materials for the balloon include inorganic materials such as glass, shirasu, and silica, and organic materials such as phenol resin, urea resin, polystyrene, saran, and acrylonitrile. The material of the balloon is not limited to these materials. The material of the balloon may be a composite material consisting of an inorganic material and an organic material. Moreover, a plurality of layers may be laminated as the balloon material. Moreover, one type of balloon may be used alone, or two or more types may be used in combination. The surface of the balloon may be treated, coated, or treated with various surface treatment agents. For example, an organic balloon coated with calcium carbonate, talc, titanium oxide, etc., or an inorganic balloon whose surface is treated with a silane coupling agent can be used.

The amount of the spherical hollow body (balloon) used is preferably 0.01 to 30 parts by weight based on 100 parts by weight of the organic polymer (A). The lower limit is more preferably 0.1 parts by weight, and the upper limit is more preferably 20 parts by weight. When the spherical hollow bodies are used in an amount within the above range, the curable composition has good benign properties, and it is easy to form a cured product with excellent elongation and breaking strength.

(Adhesive agent)
The curable composition may also contain an adhesion-imparting agent. Examples of adhesion agents include silane coupling agents.
A silane coupling agent is a compound having a hydrolyzable silicon group and a functional group other than the hydrolyzable silicon group in its molecule. The use of a silane coupling agent has a particularly remarkable effect of improving adhesion to various adherends. In addition to the above-mentioned functions, the silane coupling agent can also function as a dehydrating agent, a physical property regulator, a dispersibility improver for inorganic fillers, and the like.

The hydrolyzable group in the hydrolyzable silicon group included in the silane coupling agent is not particularly limited. Examples of the hydrolyzable group include a hydrogen atom, a halogen atom, an alkoxy group, an aryloxy group, an alkenyloxy group, an acyloxy group, a ketoximate group, an amino group, an amide group, an acid amide group, an aminooxy group, and a mercapto group. can be mentioned. Among these, halogen atoms, alkoxy groups, alkenyloxy groups, and aryloxy groups are preferred in terms of high activity. Chlorine atoms and alkoxy groups are preferred because they can be easily introduced into the silane coupling agent. Alkoxy groups such as a methoxy group and an ethoxy group are more preferable, and a methoxy group and an ethoxy group are particularly preferable because they are mildly hydrolyzable and easy to handle. The number of hydrolyzable groups bonded to silicon atoms in the silane coupling agent may be preferably three in order to ensure good adhesion. Moreover, in order to ensure the storage stability of the curable composition, two pieces may be good.

When using a silane coupling agent as an adhesion-imparting agent, an aminosilane coupling agent having a hydrolyzable silicon group and a substituted or unsubstituted amino group is preferable because it has a large adhesion-improving effect. There are no particular limitations on the substituents in the substituted amino group. Examples of the substituent include an alkyl group, an aralkyl group, and an aryl group.

Specific examples of aminosilane coupling agents include γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropylmethyldimethoxysilane, γ-aminopropylmethyldiethoxysilane, γ-(2-aminoethyl ) aminopropyltrimethoxysilane, γ-(2-aminoethyl)aminopropylmethyldimethoxysilane, γ-(2-aminoethyl)aminopropyltriethoxysilane, γ-(2-aminoethyl)aminopropylmethyldiethoxysilane, γ-(2-(2-aminoethyl)aminoethyl)aminopropyltrimethoxysilane, γ-(6-aminohexyl)aminopropyltrimethoxysilane, 3-(N-ethylamino)-2-methylpropyltrimethoxysilane , γ-ureidopropyltrimethoxysilane, γ-ureidopropyltriethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, N-benzyl-γ-aminopropyltrimethoxysilane, N-vinylbenzyl-γ-aminopropyl Triethoxysilane, N-cyclohexylaminomethyltriethoxysilane, N-cyclohexylaminomethyldiethoxymethylsilane, N-phenylaminomethyltrimethoxysilane, N-butylaminopropyltrimethoxysilane, (2-aminoethyl)aminomethyltrimethoxysilane Amino group-containing silanes such as methoxysilane, N,N'-bis[3-(trimethoxysilyl)propyl]ethylenediamine, and bis(trimethoxysilylpropyl)amine; N-(1,3-dimethylbutylidene)- Examples include ketimine type silanes such as 3-(triethoxysilyl)-1-propanamine.

Among these, γ-aminopropyltrimethoxysilane, γ-(2-aminoethyl)aminopropyltrimethoxysilane, and γ-(2-aminoethyl)aminopropylmethyldimethoxysilane are preferred in terms of good adhesiveness of the cured product. Silane is preferred. Only one type of aminosilane coupling agent may be used, or two or more types may be used in combination. A silane coupling agent obtained by partially condensing hydrolyzable silicon groups to form an oligomer can also be suitably used in terms of safety and stability. The silane coupling agent to be condensed may be a single type or multiple types. Examples of the oligomerized silane coupling agent include Dynasylan 1146 manufactured by Evonik. In terms of good storage stability of the curable composition, γ-aminopropyltrimethoxysilane and γ-(2-aminoethyl)aminopropylmethyldimethoxysilane are preferred.

Specific examples of silane coupling agents other than aminosilane coupling agents include γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, β-(3 , 4-epoxycyclohexyl)ethyltrimethoxysilane, and epoxy group-containing silane coupling agents such as β-(3,4-epoxycyclohexyl)ethyltriethoxysilane; γ-isocyanatepropyltrimethoxysilane, γ-isocyanatepropyltriethoxy Isocyanate group-containing silane coupling agents such as silane, γ-isocyanatepropylmethyldiethoxysilane, γ-isocyanatepropylmethyldimethoxysilane, (isocyanatemethyl)trimethoxysilane, and (isocyanatemethyl)dimethoxymethylsilane; γ-mercaptopropyltrimethoxysilane; Mercapto group-containing silane coupling agents such as methoxysilane, γ-mercaptopropyltriethoxysilane, γ-mercaptopropylmethyldimethoxysilane, γ-mercaptopropylmethyldiethoxysilane, and mercaptomethyltriethoxysilane; β-carboxyethyltriethoxy Carboxysilane coupling agents such as silane, β-carboxyethyl phenylbis(2-methoxyethoxy)silane, and N-β-(carboxymethyl)aminoethyl-γ-aminopropyltrimethoxysilane; vinyltrimethoxysilane, vinyltrimethoxysilane, Vinyl-type unsaturated group-containing silane coupling agents such as ethoxysilane, γ-methacryloyloxypropylmethyldimethoxysilane, and γ-acryloyloxypropylmethyltriethoxysilane; halogen-containing silane coupling agents such as γ-chloropropyltrimethoxysilane ; Examples include isocyanurate silane coupling agents such as tris(trimethoxysilyl)isocyanurate. Moreover, a condensate obtained by partially condensing the above-mentioned silane coupling agents can also be used. Examples of such condensates include Dynasylan 6490 and Dynasylan 6498 manufactured by Evonik. Furthermore, modified derivatives of these, such as amino-modified silyl polymers, silylated aminopolymers, unsaturated aminosilane complexes, phenylamino long-chain alkylsilanes, aminosilylated silicones, and silylated polyesters, can also be used as silane coupling agents. can.

Among these, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, and γ-glycidoxypropylmethyldimethoxysilane are preferred in terms of good adhesiveness of the cured product.

The above-mentioned silane coupling agents may be used alone or in combination of two or more.
The amount of the silane coupling agent used is preferably 0.1 to 20 parts by weight, more preferably 0.5 to 10 parts by weight, based on 100 parts by weight of the organic polymer (A).

(Plasticizer)
The curable composition may also contain a plasticizer. By adding a plasticizer, the viscosity and slump properties of the curable composition, and the mechanical properties such as the tensile strength and elongation of the cured product can be adjusted.

Specific examples of plasticizers include phthalate ester compounds such as dibutyl phthalate, diisononyl phthalate (DINP), diheptyl phthalate, di(2-ethylhexyl) phthalate, diisodecyl phthalate (DIDP), and butylbenzyl phthalate; Terephthalate ester compounds such as ethylhexyl)-1,4-benzenedicarboxylate; Non-phthalate ester compounds such as 1,2-cyclohexanedicarboxylic acid diisononyl ester; dioctyl adipate, dioctyl sebacate, dibutyl sebacate, diisodecyl succinate , and aliphatic polycarboxylic acid ester compounds such as acetyl tributyl citrate; unsaturated fatty acid ester compounds such as butyl oleate and methyl acetyl ricinoleate; alkyl sulfonic acid phenyl esters; Acid ester compounds; trimellitic acid ester compounds; chlorinated paraffins; hydrocarbon oils such as alkyldiphenyl and partially hydrogenated terphenyl; process oils; epoxy plasticizers such as epoxidized soybean oil and benzyl epoxy stearate; be able to.
A specific example of the terephthalic acid ester compound is EASTMAN168 (trade name, manufactured by EASTMAN CHEMICAL). A specific example of the non-phthalate compound is Hexamoll DINCH (trade name, manufactured by BASF). A specific example of the alkyl sulfonic acid phenyl ester includes Mesamoll (trade name, manufactured by LANXESS).

Polymeric plasticizers can also be used. When a polymer plasticizer is used, the initial physical properties of the cured product can be maintained for a longer period of time than when a low-molecular plasticizer is used. Furthermore, drying properties (paintability) when an alkyd paint is applied to the cured product are improved.

Specific examples of polymer plasticizers include vinyl polymers that are polymers of vinyl monomers; esters of polyalkylene glycols and polyols such as diethylene glycol dibenzoate, triethylene glycol dibenzoate, and pentaerythritol ester; sebacic acid Polyester plasticizer obtained from dibasic acids such as , adipic acid, azelaic acid, and phthalic acid, and dihydric alcohols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, and dipropylene glycol; number average molecular weight Polyether polyols such as polyethylene glycol, polypropylene glycol, and polytetramethylene glycol having a molecular weight of 500 or more, or even 1,000 or more; derivatives obtained by converting the hydroxyl groups of these polyether polyols into ester groups, ether groups, etc.; polystyrene and poly-α - Polystyrenes such as methylstyrene; examples include polybutadiene, polybutene, polyisobutylene, butadiene-acrylonitrile, and polychloroprene. Polymer plasticizers are not limited to these.

The polymer plasticizer is preferably compatible with the organic polymer (A). From this point of view, polyethers and vinyl polymers are preferred. When polyethers are used as plasticizers, surface curability and deep curability are improved, and curing retardation after storage does not occur. Among polyethers, polypropylene glycol is more preferred. Furthermore, vinyl polymers are preferred from the viewpoint of compatibility with the organic polymer (A) and the weather resistance and heat resistance of the cured product. Among vinyl polymers, acrylic polymers and/or methacrylic polymers are preferred, and acrylic polymers such as polyacrylic acid alkyl esters are more preferred. As a method for synthesizing the vinyl polymer, a living radical polymerization method is preferred, and an atom transfer radical polymerization method is more preferred, since a polymer with a narrow molecular weight distribution and low viscosity can be obtained. Furthermore, the so-called SGO process, which involves continuous bulk polymerization of an acrylic acid alkyl ester monomer at high temperature and high pressure, as described in JP-A No. 2001-207157, is also preferred as a method for producing vinyl polymers.

The number average molecular weight of the polymer plasticizer is preferably 500 to 15,000, more preferably 800 to 10,000, even more preferably 1,000 to 8,000, particularly preferably 1,000 to 5,000, and 1 ,000 to 3,000 is most preferred.
When the number average molecular weight of the polymer plasticizer is within the above range, the initial physical properties of the cured product can be maintained for a long period of time while suppressing the outflow of the plasticizer from the cured product over time due to heat, rainfall, etc. The curable composition has an appropriate viscosity and has good workability.
Although the molecular weight distribution of the polymer plasticizer is not particularly limited, it is preferably narrow. Specifically, the molecular weight distribution is preferably less than 1.80, more preferably 1.70 or less, even more preferably 1.60 or less, even more preferably 1.50 or less, particularly preferably 1.40 or less, 1. Most preferably 30 or less.

The number average molecular weight of the vinyl polymer is measured by GPC method. The number average molecular weight of a polyether polymer is measured by an end group analysis method. Further, the molecular weight distribution (Mw/Mn) is measured by the GPC method (in terms of polystyrene).

The polymeric plasticizer may or may not have reactive silicon groups. When the polymer plasticizer has a reactive silicon group, the polymer plasticizer acts as a reactive plasticizer and can prevent migration of the plasticizer from the cured product. When the polymer plasticizer has a reactive silicon group, the number of reactive silicon groups per molecule is preferably 1 or less on average, and more preferably 0.8 or less. When using a plasticizer having a reactive silicon group, especially a polyether polymer having a reactive silicon group, its number average molecular weight needs to be lower than that of the organic polymer (A).

The amount of plasticizer used is preferably 5 to 150 parts by weight, more preferably 10 to 120 parts by weight, and even more preferably 20 to 100 parts by weight, based on 100 parts by weight of the organic polymer (A). When the amount of the plasticizer used is within the above range, a cured product with excellent mechanical strength can be formed while sufficiently obtaining the desired effect of using the plasticizer. Plasticizers may be used alone or in combination of two or more. A low molecular plasticizer and a polymer plasticizer may be used together. These plasticizers may be blended into the organic polymer (A) when producing the organic polymer (A).

(solvent, diluent)
The curable composition may contain a solvent or a diluent. The solvent and diluent are not particularly limited. As the solvent and diluent, aliphatic hydrocarbons, aromatic hydrocarbons, alicyclic hydrocarbons, halogenated hydrocarbons, alcohols, esters, ketones, ethers, and the like can be used. When a solvent or diluent is used, the boiling point of the solvent is preferably 150°C or higher, more preferably 200°C or higher, and 250°C or higher due to the problem of air pollution when the curable composition is used indoors. is particularly preferred. The above solvents or diluents may be used alone or in combination of two or more.

(anti-sagging agent)
The curable composition may contain an anti-sagging agent to prevent sagging and improve workability, if necessary. The anti-sagging agent is not particularly limited. Examples of anti-sagging agents include polyamide waxes; hydrogenated castor oil derivatives; metal soaps such as calcium stearate, aluminum stearate, and barium stearate. These anti-sagging agents may be used alone or in combination of two or more.
The amount of the anti-sagging agent used is preferably 0.1 to 20 parts by weight per 100 parts by weight of the organic polymer (A).

(Antioxidant)
The curable composition may contain an antioxidant (antiaging agent). Use of an antioxidant can improve the weather resistance of the cured product. Examples of antioxidants include hindered phenol compounds, monophenol compounds, bisphenol compounds, and polyphenol compounds, with hindered phenol compounds being particularly preferred.
Examples of antioxidants include Irganox 245, Irganox 1010, Irganox 1035, Irganox 1076, Irganox 1135, Irganox 1330, and Irganox 1520 (all manufactured by BASF); SONGNOX 1076 (manufactured by SONGWON), and BHT. can be mentioned.
Tinuvin 622LD, Tinuvin 144, Tinuvin 292, CHIMASSORB944LD, CHIMASSORB119FL (all manufactured by BASF); Adekastab LA-57, Adekastab LA-62, Adekastab LA-67, Adekastab LA-63, Adekastab LA-68 (all made by BASF) Hindered amine light stabilizers such as Sanol LS-2626, Sanol LS-1114, Sanol LS-744 (all manufactured by Sankyo Lifetech Co., Ltd.); Nocrac CD (manufactured by Ouchi Shinko Chemical Industry Co., Ltd.); You can also use
In addition, antioxidants such as SONGNOX 4120, Naugard 445, and OKABEST CLX050 can also be used.
Specific examples of antioxidants are also described in JP-A-4-283259 and JP-A-9-194731.
The amount of the antioxidant used is preferably 0.1 to 10 parts by weight, more preferably 0.2 to 5 parts by weight, based on 100 parts by weight of the organic polymer (A).

(light stabilizer)
The curable composition may also include a light stabilizer. Use of a light stabilizer can prevent photooxidative deterioration of the cured product. Examples of the light stabilizer include benzotriazole compounds, hindered amine compounds, and benzoate compounds. As the light stabilizer, hindered amine compounds are particularly preferred.
The amount of the light stabilizer used is preferably 0.1 to 10 parts by weight, more preferably 0.2 to 5 parts by weight, based on 100 parts by weight of the organic polymer (A).
Specific examples of light stabilizers are described in, for example, JP-A-9-194731.

When blending a photocurable substance into a curable composition, especially when using an unsaturated acrylic compound, as described in JP-A-5-70531, a tertiary amine-containing hindered amine light stabilizer is used. It is preferable to use a hindered amine light stabilizer in order to improve the storage stability of the curable composition. Tertiary amine-containing hindered amine light stabilizers include Tinuvin 123, Tinuvin 144, Tinuvin 249, Tinuvin 292, Tinuvin 312, Tinuvin 622LD, Tinuvin 765, Tinuvin 770, Tinuvin 880, Tinuvin 5866, Tinuvin B97, CHIMASSORB 119FL, CHIMASSORB 94. 4LD( All of the above are manufactured by BASF); ADEKA STAB LA-57, LA-62, LA-63, LA-67, LA-68 (all of the above are manufactured by ADEKA Corporation); Sanol LS-292, LS-2626, LS-765, LS-744, LS-1114 (all manufactured by Sankyo Lifetech Co., Ltd.), SABOSTAB UV91, SABOSTAB UV119, SONGSORB CS5100, SONGSORB CS622, SONGSORB CS944 (all manufactured by SONGWON), Nocrack CD (Ouchi Shinko Chemical) industrial stocks (manufactured by a company), etc.

(Ultraviolet absorber)
The curable composition may also contain an ultraviolet absorber. Use of an ultraviolet absorber can improve the surface weather resistance of the cured product. Examples of the ultraviolet absorber include benzophenone compounds, benzotriazole compounds, salicylate compounds, triazine compounds, substituted tolyl compounds, and metal chelate compounds. Among these, benzotriazole compounds are particularly preferred. Specific examples of benzotriazole compounds include Tinuvin 234, Tinuvin 326, Tinuvin 327, Tinuvin 328, Tinuvin 329, Tinuvin 350, Tinuvin 571, Tinuvin 900, Tinuvin 928, Tinuvin 1130, Tinuvin 1600 (all manufactured by BASF); SONGSORB3290 (manufactured by SONGWON) is mentioned. Specific examples of triazine compounds include Tinuvin 400, Tinuvin 405, Tinuvin 477, Tinuvin 1577ED (all manufactured by BASF); SONGSORB CS400, SONGSORB 1577 (manufactured by SONGWON). A specific example of the benzophenone compound is SONGSORB8100 (manufactured by SONGWON).
The amount of the ultraviolet absorber used is preferably 0.1 to 10 parts by weight, more preferably 0.2 to 5 parts by weight, based on 100 parts by weight of the organic polymer (A). It is preferable to use a phenolic antioxidant or a hindered phenolic antioxidant, a hindered amine light stabilizer, and a benzotriazole ultraviolet absorber in combination.
Addworks IBC760 (manufactured by Clariant) can be used as a product containing a mixture of an antioxidant, a light stabilizer, and a UV absorber.

(Physical property modifier)
The curable composition may contain a physical property modifier that adjusts the tensile properties of the cured product, if necessary. The physical property modifier is not particularly limited. Examples of physical property modifiers include alkylalkoxysilanes such as methyltrimethoxysilane, dimethyldimethoxysilane, trimethylmethoxysilane, and n-propyltrimethoxysilane; dimethyldiisopropenoxysilane, methyltriisopropenoxysilane, and γ- Alkylisopropenoxysilane such as glycidoxypropylmethyldiisopropenoxysilane, γ-glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropyltrimethoxysilane, vinyltrimethoxysilane, vinyldimethylmethoxysilane, γ- Alkoxysilanes having functional groups such as aminopropyltrimethoxysilane, N-β-aminoethyl-γ-aminopropylmethyldimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropylmethyldimethoxysilane; silicone varnishes; Examples include polysiloxanes. By using a physical property modifier, the hardness of the cured product can be increased, or conversely, the hardness of the cured product can be decreased and elongation at break can be increased. The above physical property modifiers may be used alone or in combination of two or more.

In particular, a compound that produces a compound having a monovalent silanol group in its molecule upon hydrolysis has the effect of lowering the modulus of the cured product without worsening the stickiness of the surface of the cured product. As a compound that produces a compound having a monovalent silanol group in the molecule upon hydrolysis, a compound that produces trimethylsilanol is particularly preferred. Examples of compounds that produce compounds having a monovalent silanol group in the molecule upon hydrolysis include compounds described in JP-A-5-117521. In addition, derivatives of alkyl alcohols such as hexanol, octanol, and decanol, which produce trialkylsilanols such as trimethylsilanol by hydrolysis, and Examples include derivatives of polyhydric alcohols having three or more hydroxyl groups, such as trimethylolpropane, glycerin, pentaerythritol, or sorbitol, which produce alkylsilanols.
Also included are derivatives of oxyalkylene polymers that produce silicon compounds that produce trialkylsilanols such as trimethylsilanol upon hydrolysis, as described in JP-A-7-258534. Furthermore, it is also possible to use a polymer having a crosslinkable hydrolyzable silicon-containing group and a silicon-containing group that can become a monosilanol-containing compound by hydrolysis, as described in JP-A-6-279693.
The physical property modifier is used in an amount of 0.1 to 20 parts by weight, preferably 0.5 to 10 parts by weight, based on 100 parts by weight of the organic polymer (A).

(tackifying resin)
The curable composition may contain a tackifier resin for the purpose of increasing the adhesion and adhesion of the cured product to the base material. The tackifier resin is not particularly limited, and tackifier resins commonly used in various curable compositions can be used.
Specific examples of tackifier resins include terpene resin, aromatic modified terpene resin, hydrogenated terpene resin, terpene-phenol resin, phenol resin, modified phenol resin, xylene-phenol resin, cyclopentadiene-phenol resin, coumaron indene. Resin, rosin resin, rosin ester resin, hydrogenated rosin ester resin, xylene resin, low molecular weight polystyrene resin, styrene copolymer resin, styrenic block copolymer, hydrogenated product of styrene block copolymer, petroleum Examples include resin, hydrogenated petroleum resin, and DCPD resin. Examples of petroleum resins include C5 hydrocarbon resins, C9 hydrocarbon resins, and C5C9 hydrocarbon copolymer resins. These may be used alone or in combination of two or more.
The amount of the tackifying resin used is preferably 2 to 100 parts by weight, more preferably 5 to 50 parts by weight, and even more preferably 5 to 30 parts by weight, based on 100 parts by weight of the organic polymer (A). By using the tackifying resin in an amount within this range, a cured product with good adhesion and adhesion to the substrate can be formed. The curable composition has an appropriate viscosity and is easy to handle.

(Compound containing epoxy group)
The curable composition may include a compound containing an epoxy group. When a compound having an epoxy group is used, the restorability of the cured product can be improved. Examples of the compound having an epoxy group include epoxidized unsaturated oils and fats, epoxidized unsaturated fatty acid esters, alicyclic epoxy compounds, epichlorohydrin derivatives, and mixtures thereof. Specific examples of compounds having epoxy groups include epoxidized soybean oil, epoxidized linseed oil, bis(2-ethylhexyl)-4,5-epoxycyclohexane-1,2-dicarboxylate (E-PS), Examples include epoxy octyl stearate and epoxy butyl stearate.
The amount of the epoxy group-containing compound used is preferably 0.5 to 50 parts by weight based on 100 parts by weight of the organic polymer (A).

(Epoxy resin)
The curable composition may contain an epoxy resin. Curable compositions containing epoxy resins are preferred as adhesives, especially adhesives for exterior wall tiles. Examples of the epoxy resin include bisphenol A type epoxy resins and novolac type epoxy resins.
The ratio between the weight of the organic polymer (A) and the weight of the epoxy resin is in the range of 100/1 to 1/100, expressed as (weight of organic polymer (A))/(weight of epoxy resin). is preferred. When the organic polymer (A) and epoxy resin are used in the above ratio, it is easy to form a high-strength cured product with excellent impact strength and toughness.
When using an epoxy resin, the curable composition may contain a curing agent together with the epoxy resin. The type of curing agent is not particularly limited, and commonly used curing agents can be used.
The amount of curing agent used is preferably 0.1 to 300 parts by weight per 100 parts by weight of the epoxy resin.

(light curing substance)
The curable composition may include a photocurable substance. When a photocurable substance is used, a film of the photocurable substance is formed on the surface of the cured product, and the stickiness of the cured product and the weather resistance of the cured product can be improved. Various compounds such as organic monomers, oligomers, and resins are known as photocurable substances. Furthermore, many compositions containing photocurable substances are also known. Typical photocurable materials include unsaturated acrylic compounds, polyvinyl cinnamates, and azidated resins. Examples of the unsaturated acrylic compound include monomers, oligomers, and mixtures thereof having one or more acrylic unsaturated groups or methacrylic unsaturated groups.
The amount of the photocurable substance used is preferably 0.1 to 20 parts by weight, more preferably 0.5 to 10 parts by weight, based on 100 parts by weight of the organic polymer (A). When the photocurable material is used in an amount within this range, it is easy to form a flexible cured product that has excellent weather resistance and suppresses the occurrence of cracks.

(oxygen curing substance)
The curable composition may include an oxygen curable material. Examples of oxygen-curable substances include unsaturated compounds that can react with oxygen in the air. When the curable substance contains an oxygen curable substance, the oxygen curable substance reacts with oxygen in the air to form a cured film near the surface of the cured product. By forming a cured film on the surface of the cured product, stickiness and adhesion of dirt and dust to the surface of the cured product can be prevented. Specific examples of oxygen-curable substances include drying oils such as tung oil and linseed oil; various alkyd resins obtained by modifying drying oils; acrylic polymers modified with drying oils, epoxy resins, and silicones. Resin: 1,2-polybutadiene, 1,4-polybutadiene, or C5 to C8 diene polymers obtained by polymerizing or copolymerizing diene compounds such as butadiene, chloroprene, isoprene, or 1,3-pentadiene. Examples include liquid polymers. These may be used alone or in combination of two or more.
The amount of the oxygen-curable substance used is preferably 0.1 to 20 parts by weight, more preferably 0.5 to 10 parts by weight, based on 100 parts by weight of the organic polymer (A). When the amount of the oxygen-curable substance is within this range, the surface is less likely to be contaminated by dirt and dust, and a cured product having excellent mechanical properties such as tensile properties is easily formed. As described in JP-A-3-160053, oxygen-curable substances are preferably used in combination with photo-curable substances.

<Preparation of curable composition>
The curable composition can be prepared as a one-component composition in which all the ingredients are mixed in advance and stored in a sealed container, and the composition is cured by moisture in the air after application. The curing agent composition is a composition containing a curing catalyst (B), a compounding material as a curing agent containing components such as a filler, a plasticizer, and water, and a separately prepared organic polymer (A). The product can also be prepared as a two-component product that is mixed before use. From the viewpoint of workability, a one-component type is preferable.
When the curable composition is a one-component type, all the ingredients are mixed in advance, so ingredients containing water must be dehydrated and dried before use, or they can be dehydrated by vacuum, etc. during compounding and kneading. is preferable. In addition to the dehydration drying method, methyltrimethoxysilane, phenyltrimethoxysilane, n-propyltrimethoxysilane, vinyltrimethoxysilane, vinylmethyldimethoxysilane, γ-mercaptopropylmethyldimethoxysilane, γ-mercaptopropylmethyldiethoxysilane, By adding an alkoxysilane compound such as γ-glycidoxypropyltrimethoxysilane, the storage stability is further improved. As the dehydrating agent, partially condensed silane compounds such as Dynasylan 6490 manufactured by Evonik, etc. can also be suitably used from the viewpoint of safety and stability.
The amount of the dehydrating agent, especially the silicon compound capable of reacting with water such as vinyltrimethoxysilane, is preferably 0.1 to 20 parts by weight, and 0.5 to 10 parts by weight, based on 100 parts by weight of the organic polymer (A). Parts by weight are more preferred.

The order in which the amidine compound (b1), titanium compound (b2), and salicylic acid ester (b3) are added to the ingredients constituting the one-component curable composition or the two-component curable composition may be determined as desired. There is no particular limitation as long as the effect is not impaired.
It is preferable that the salicylic acid ester (b3), the amidine compound (b1), and the titanium compound (b2) are added in this order because it is easy to obtain a curable composition with excellent fast curing properties.

The curable composition can be used as a building sealant, an industrial adhesive, a composition for forming a waterproof coating film, a raw material for an adhesive, and the like. Further, the curable composition can be used as a sealant for buildings, ships, automobiles, roads, etc. Further, the curable composition, alone or with the aid of a primer, can adhere to a wide range of substrates such as glass, porcelain, wood, metal, and resin moldings. For this reason, the curable compositions can also be used as various types of sealing and adhesive compositions. In addition to conventional adhesives, the curable composition can also be used as a contact adhesive. Furthermore, the curable composition is useful as a food packaging material, a casting rubber material, a molding material, and a paint. The cured product of the above curable composition exhibits low water absorption. Therefore, the above-mentioned curable composition and cured product thereof are particularly suitable for use in waterproof materials such as sealants, waterproof adhesives, and waterproof coatings.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. are also included within the technical scope of the present invention.

That is, one aspect of the present invention includes the following.

<1> A curable composition comprising an organic polymer (A) and a curing catalyst (B),
The organic polymer (A) has the following formula (1):
-SiR ¹ _3-a X _a (1)
(In formula (1), R ¹ represents a substituted or unsubstituted hydrocarbon group having 1 to 20 carbon atoms, or a triorganosiloxy group represented by R ⁰ ₃ SiO-, and three R ⁰ are A hydrocarbon group having 1 to 20 carbon atoms, which may be the same or different,
X represents a hydroxyl group or a hydrolyzable group,
a is 1, 2, or 3;
When a plurality of R ¹ and X exist, they may be the same or different. )
It has a reactive silicon group represented by
The curing catalyst (B) contains an amidine compound (b1), a titanium compound (b2), and a salicylic acid ester (b3),
Amidine compound (b1) is 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU),
The titanium compound (b2) has the following formula (2):
Ti(OR ² ) _d Y _4-d (2)
(In formula (2), R ² is a hydrocarbon group having 1 to 20 carbon atoms that may have a substituent, Y is a chelate coordination compound, and d is an integer of 0 to 4. )
It is a compound represented by
A curable composition in which two or more selected from an amidine compound (b1), a titanium compound (b2), and a salicylic acid ester (b3) may react with each other.
<2> The main chain structure of the organic polymer (A) is one or more selected from the group consisting of polyoxyalkylene polymers, saturated hydrocarbon polymers, and (meth)acrylic acid ester polymers. The curable composition according to <1>.
<3> The curable composition according to <2>, wherein the main chain structure of the organic polymer (A) is a polyoxyalkylene polymer.
<4> The salicylic acid ester (b3) is selected from the group consisting of methyl salicylate, ethyl salicylate, isopropyl salicylate, isobutyl salicylate, isoamyl salicylate, 2-ethylhexyl salicylate, 3,3,5-trimethylcyclohexyl salicylate, phenyl salicylate, etc. The curable composition according to any one of <1> to <3>, which is one or more types of.
<5> A cured product of the curable composition according to any one of <1> to <4>.
<6> A waterproof material using the curable composition according to any one of <1> to <4> or a cured product of the curable composition.

Hereinafter, the present invention will be explained in more detail by giving specific examples. The present invention is not limited to the following examples.

(Synthesis example of organic polymer (A))
Hereinafter, the number average molecular weight is the GPC molecular weight measured under the following conditions.
Liquid feeding system: Tosoh HLC-8420GPC
Column: Tosoh TSKgel SuperH series Solvent: THF
Molecular weight: polystyrene equivalent Measurement temperature: 40°C

The terminal group equivalent molecular weight in the examples is the molecular weight determined by determining the hydroxyl value by the measuring method of JIS K 1557 and the iodine value by the measuring method of JIS K 0070, taking into consideration the structure of the organic polymer. What was considered for the structure of the organic polymer was the degree of branching determined by the polymerization initiator used.

The average number of silyl groups per terminal or per molecule of the polymer shown in the examples is calculated by measurement by ¹ H-NMR (measured in CDCl ₃ solvent using Bruker's AVANCE III HD-500). did.

(Preparation Example 1: Synthesis of organic polymer (A-1))
Propylene oxide was polymerized using polyoxypropylene diol having a molecular weight of about 2,000 as an initiator and a zinc hexacyanocobaltate glyme complex catalyst to obtain a hydroxyl-terminated polypropylene oxide having a number average molecular weight of 28,500. Subsequently, a methanol solution of NaOMe was added in an amount of 1.2 molar equivalents to the hydroxyl groups of the hydroxyl-terminated polypropylene oxide. After methanol was distilled off from the reaction solution, allyl chloride was added to the reaction solution to convert the terminal hydroxyl group into an allyl group. Unreacted allyl chloride was removed by devolatilization under reduced pressure. 300 parts by weight of n-hexane and 300 parts by weight of water were mixed with 100 parts by weight of the obtained unpurified allyl group-terminated polypropylene oxide, followed by stirring. Next, the mixture was separated into an aqueous phase and a hexane phase by centrifugation, and then the aqueous phase was removed. The obtained hexane phase was mixed with 300 parts by weight of water and then stirred. The mixture was again separated into an aqueous phase and a hexane phase by centrifugation, and then the aqueous phase was removed. Thereafter, hexane was removed from the hexane phase by devolatilization under reduced pressure. As a result of the above, a bifunctional polypropylene oxide having an allyl group at the end and having a number average molecular weight of about 28,500 was obtained. To 100 parts by weight of the obtained allyl-terminated polypropylene oxide, 150 ppm of a 2-propanol solution of a platinum vinyl siloxane complex with a platinum content of 3 wt% was added as a catalyst. Next, 0.8 molar equivalent of trimethoxysilane with respect to the allyl group of the allyl-terminated polypropylene oxide was added to the allyl-terminated polypropylene oxide, and the allyl end group and trimethoxysilane were reacted at 90°C for 5 hours to form trimethoxysilyl. A group-terminated polyoxypropylene polymer (A-1) was obtained. The number of trimethoxysilyl groups was about 0.7 per polymer chain end.

(Examples 1 to 8 and Comparative Examples 1 to 12)
Colloidal calcium carbonate (manufactured by Shiroishi Kogyo Co., Ltd., trade name: Shiroenka CCR), ground calcium carbonate (manufactured by Shiroishi Calcium Co., Ltd.) in the amounts listed in Table 1 or Table 2, respectively, for the polymer (A-1). , trade name: Whiten SB), plasticizer (manufactured by BASF, trade name: Hexamoll DINCH), pigment (manufactured by Ishihara Sangyo Co., Ltd., trade name: Typeke R820), thixotropic agent (manufactured by ARKEMA, trade name: Crayvallac SL), antioxidant (manufactured by BASF, trade name: Irganox 1010), ultraviolet absorber (manufactured by BASF, trade name: Tinuvin 326), and light stabilizer (manufactured by BASF, trade name: Tinuvin 770), and using a spatula After mixing using a 3-roll mill, the mixture was dispersed by passing it through a three-roll mill three times to obtain a main ingredient.

The main ingredient was weighed into a 100 ml plastic container under an atmosphere of 23° C. and 50% relative humidity. Salicylic acid ester (b3), or ester or phenol compound (b'3) of the type and amount listed in Table 1 or Table 2, so as to have the composition ratio listed in Table 1 or Table 2, and Table 1 , or the type and amount of titanium compound (b2) or other metal compound (b'2) listed in Table 2 were added to the plastic container, and the contents of the plastic container were thoroughly mixed with a spatula.
Next, a dehydrating agent (manufactured by Evonik, trade name: Dynasylan VTMO, vinyltrimethoxysilane) was added in the amount shown in Table 1 or Table 2, and an adhesion promoter (manufactured by Evonik) was added in the amount shown in Table 1 or Table 2. , trade name: Dynasylan AMMO, γ-aminopropyltrimethoxysilane) and an amidine compound (b1) in the amount listed in Table 1 or 2, or another amidine compound (b1) in the amount listed in Table 1 or Table 2. b'1) were added to a plastic container in this order, and the contents of the plastic container were thoroughly mixed to obtain a curable composition.
In addition, in Comparative Example 9, the amidine compound (b1) and other amidine compounds (b'1) were not used. In Comparative Example 8, the titanium compound (b2) and other metal compounds (b'2) were not used. In Comparative Example 7, the salicylic acid ester (b3) and the ester or phenol compound (b'3) were not used.

The numerical values regarding each component listed in Table 1 or Table 2 are the amount (parts by weight) of each component.
In Table 1 or Table 2, amidine compound (b1), other amidine compound (b'1), titanium compound (b2), other metal compound (b'2), salicylic acid ester (b3), and ester or phenol. Compound (b'3) is as follows. When the other metal compound (b'2) is an isopropanol or 1-propanol solution, the values listed in Table 1 or Table 2 are the solid content and solvent content of the other metal compound (b'2). This is the total amount.
(Amidine compound (b1))
DBU: 1,8-diazabicyclo[5.4.0]undec-7-ene (manufactured by Tokyo Chemical Industry Co., Ltd.)
DBN: 1,5-diazabicyclo[4.3.0]non-5-ene (manufactured by San-Apro Co., Ltd.)
MTBD: 7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene (manufactured by Tokyo Chemical Industry Co., Ltd.)
(Other amidine compounds (b'1))
1-(o-tolyl) biguanide (manufactured by Tokyo Chemical Industry Co., Ltd.)
(Titanium compound (b2))
Ti(OiPr) ₄ : Tetraisopropoxy titanium (manufactured by Tokyo Kasei Kogyo Co., Ltd.)
TC-750: Diisopropoxy titanium bis(ethyl acetoacetate) (manufactured by Matsumoto Fine Chemical Co., Ltd., ORGATIX (registered trademark) TC-750)
(Other metal compounds (b'2))
Al(OsBu) ₃ : Trisec-butoxyaluminum (manufactured by Tokyo Kasei Kogyo Co., Ltd.)
VO(OPr) ₃ : Vanadium (V) oxytriisopropoxide (manufactured by Tokyo Chemical Industry Co., Ltd.)
Zr(OPr) ₄ /PrOH: 1-propanol solution of tetrapropoxyzirconium with a concentration of about 70% by mass (manufactured by Tokyo Chemical Industry Co., Ltd.)
(Salicylic acid ester (b3))
Ethyl salicylate (manufactured by Tokyo Kasei Kogyo Co., Ltd.)
Isopropyl salicylate (manufactured by Tokyo Chemical Industry Co., Ltd.)
Isobutyl salicylate (manufactured by Tokyo Kasei Kogyo Co., Ltd.)
Isoamyl salicylate (manufactured by Tokyo Kasei Kogyo Co., Ltd.)
2-ethylhexyl salicylate: manufactured by Tokyo Kasei Kogyo Co., Ltd.)
3,3,5-trimethylcyclohexyl salicylate (manufactured by Tokyo Chemical Industry Co., Ltd.)
(Ester or phenol compound (b'3))
Phenol (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.)
Salicylic acid (manufactured by Kishida Chemical Co., Ltd.)
Ethyl DL-3-hydroxybutyrate (manufactured by Tokyo Chemical Industry Co., Ltd.)

(Skinning time (hardening))
The curable composition was touched with a spatula in an atmosphere of 23° C. and 50% relative humidity, and the curing time (curability) was measured using the time when the mixture stopped adhering to the spatula as the skinning time. The measurement results of curing time are shown in Table 1 or 2.

(result)
As shown in Table 1, the curable compositions of Examples 1 to 8 contain a combination of a predetermined amidine compound (b1), a predetermined titanium compound (b2), and a salicylic acid ester (b3) as the curing catalyst (B). The materials showed faster curing compared to the curable compositions of Comparative Examples 1 to 12 that did not contain one or more of the amidine compound (b1), the titanium compound (b2), and the salicylic acid ester (b3).

Claims (6)

A curable composition comprising an organic polymer (A) and a curing catalyst (B),
The organic polymer (A) has the following formula (1):
-SiR ¹ _3-a X _a (1)
(In formula (1), R ¹ represents a substituted or unsubstituted hydrocarbon group having 1 to 20 carbon atoms, or a triorganosiloxy group represented by R ⁰ ₃ SiO-, and three R ⁰ are A hydrocarbon group having 1 to 20 carbon atoms, which may be the same or different,
X represents a hydroxyl group or a hydrolyzable group,
a is 1, 2, or 3;
When a plurality of R ¹ and X exist, they may be the same or different. )
It has a reactive silicon group represented by
The curing catalyst (B) contains an amidine compound (b1), a titanium compound (b2), and a salicylic acid ester (b3),
The amidine compound (b1) is 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU),
The titanium compound (b2) has the following formula (2):
Ti(OR ² ) _d Y _4-d (2)
(In formula (2), R ² is a hydrocarbon group having 1 to 20 carbon atoms that may have a substituent, Y is a chelate coordination compound, and d is an integer of 0 to 4. )
It is a compound represented by
A curable composition in which two or more selected from the amidine compound (b1), the titanium compound (b2), and the salicylic acid ester (b3) may react with each other. The main chain structure of the organic polymer (A) is one or more selected from the group consisting of polyoxyalkylene polymers, saturated hydrocarbon polymers, and (meth)acrylic acid ester polymers. The curable composition according to claim 1. The curable composition according to claim 2, wherein the main chain structure of the organic polymer (A) is the polyoxyalkylene polymer. The salicylic acid ester (b3) is selected from the group consisting of methyl salicylate, ethyl salicylate, isopropyl salicylate, isobutyl salicylate, isoamyl salicylate, 2-ethylhexyl salicylate, 3,3,5-trimethylcyclohexyl salicylate, phenyl salicylate, etc. The curable composition according to any one of claims 1 to 3, which is of at least one species. A cured product of the curable composition according to any one of claims 1 to 3. A waterproof material using the curable composition according to any one of claims 1 to 3, or a cured product of the curable composition.