JPH0657122A - Curable composition - Google Patents

Abstract

(57) [Summary] [Structure] A molecular weight of 200 obtained by converting the hydroxyl groups of polyoxypropylene triol produced using zinc hexacyanocobaltate catalyst to methyldimethoxysilyl groups.
100 parts of a polymer of 00 and n-butanol as an initiator and 40 parts of a polyether compound having a molecular weight of 6000 obtained by reacting chlorotrimethylsilane with hydroxyl groups of polyoxypropylene monool produced using a zinc hexacyanocobaltate catalyst. A curable composition was obtained by kneading. [Effect] A cured product having stain resistance, low tackiness, and low hardness can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a modified curable composition having both low hardness and low tackiness which have not been heretofore expected, and has particularly excellent stain resistance and workability. The present invention also relates to a curable composition having excellent storage stability.

[0002]

2. Description of the Related Art Polyethers having at least one reactive silyl group in the molecule have been used for coating agents, sealing agents, etc. due to the characteristics of cured products having rubber elasticity. Is often used in combination with a plasticizer.

[0003]

However, when a low molecular weight plasticizer such as dioctyl phthalate which is usually used is used, migration of the plasticizer to the surface is unavoidable, and the surface of the cured product or the surface of the coating material is unavoidable. There is a problem that pollution occurs.

A method of using a polyether compound as a high molecular weight plasticizer has been proposed (Japanese Patent Laid-Open No. 1-2799).
58 publication). The polyether compound is excellent in compatibility with the reactive silyl group-containing polyether and has a high plasticization efficiency without lowering the strength of the cured product, but when used in a large amount to achieve the desired hardness, Similar to the low molecular weight plasticizer, surface tack is remarkably generated and there is a problem in stainability, and the amount used is limited.

Moreover, the polyether compound generally has a hydroxyl group at the terminal and reacts with the reactive silyl group in the reactive silyl group-containing polyether to increase the viscosity, retard the curing,
There is a problem in practical use due to a problem such as a decrease in strength. This is particularly remarkable in a one-pack composition in which a curing catalyst coexists.

In order to solve this problem, it is possible to convert the terminal hydroxyl group of the polyether compound into an ether bond, a urethane bond, an ester bond, a carbonate bond or the like, but in this case, the process becomes complicated and it is practically used. There is also an economic problem. Further, depending on the functional group, the reactivity with the reactive silyl group in the presence of a catalyst may be higher than that of the hydroxyl group, which is not preferable. This tendency is remarkable in the aliphatic ester bond.

Further, a compound having one silanol group in the molecule or a compound capable of reacting with water to form a silanol group is added and reacted with a reactive silyl group to reduce the number of crosslinking points of the cured product. Therefore, a method of achieving plasticization has been proposed (see JP-A-61-34066). However, there is a problem that the strength of the cured product decreases due to the decrease in the number of crosslinking points.

Further, JP-A-64-9268 proposes a compound having an alcohol residue or a weak acid residue and capable of forming a silanol group.

[0009]

The present invention is the following invention relating to a curable composition made to solve the above-mentioned problems. That is, 100 parts by weight of a silyl group-containing polyether (A) containing at least one reactive silyl group represented by the following general formula (1) and a polyether compound (B) 5 represented by the following general formula (2) It is a curable composition consisting of 150 parts by weight. -SiZ _a R ¹ _3-a (1) (In the formula (1), R ¹ is an alkyl group having 1 to 20 carbon atoms or a haloalkyl group having 1 to 20 carbon atoms. Z is hydrolyzable. group .a is an integer of 1 to ^{3) R 2 -X-. (R 3} -O) m - [SiR 4 2 -O] n -SiR 5 3 ······ (2) ( provided that (2) In the formula, R ² is an alkyl group having 1 to 8 carbon atoms, R ³ is an alkylene group having 2 to 18 carbon atoms or a haloalkylene group having 2 to 18 carbon atoms, and R ⁴ is 1 to 12 carbon atoms.
Is an alkyl group or an aryl group having 1 to 12 carbon atoms, and each R ⁴ may be different from each other. R ⁵ has 1 to 1 carbon atoms
It is an alkyl group having 12 or an aryl group having 1 to 12 carbon atoms, and each R ⁵ may be different from each other. X is -O-,
-COO-, -OCO- or -S-. m is 15 to 45
An integer of 0. n is an integer of 0 to 2. )

As a result of earnest studies, the present inventors have found that by using a polyether compound (B) containing a trialkylsilyl group or a triarylsilyl group at the end and having no hydroxyl group as a plasticizer, low hardness can be obtained. Further, they have found that a curable composition having both low tackiness, particularly a curable composition having excellent stain resistance and less curing delay and excellent workability can be provided at low cost, and thus reached the present invention.

Polyether compound (B) used in the present invention
Is a polyether monool represented by the following general formula (3) obtained by reacting a monovalent active hydrogen-containing compound with a monoepoxide having 3 or more carbon atoms, and a silicon compound represented by the following general formula (4). It is preferable to obtain it. R ² —X— (R ³ —O) _m —H (3) (In (3), R ² is an alkyl group having 1 to 8 carbon atoms. R ³ is 2 to 18 carbon atoms. Or an haloalkylene group having 2 to 18 carbon atoms, where X is -O- or -COO.
-, -OCO- or -S-. m is an integer of 15 to 450. ) R ⁵ ₃ Si- [O-SiR ⁴ ₂ ] _n -Y (4) (In (4), R ⁴ is an alkyl group having 1 to 12 carbons or an aryl group having 1 to 12 carbons. And each R ⁴
May be different from each other. R ⁵ is an alkyl group having 1 to 12 carbon atoms or an aryl group having 1 to 12 carbon atoms, and each R ⁵ may be different from each other. Y is a halogen atom.
n is an integer of 0 to 2. )

A catalyst is usually required in the method for producing the polyether monool represented by the general formula (3).
A known catalyst can be used as the catalyst. Specifically, K
Examples thereof include alkali metals such as OH and complex metal cyanide complexes. When the molecular weight exceeds 3000, it is particularly preferred to use a double metal cyanide complex.

It is known to synthesize polyethers using complex metal cyanide complexes. This catalyst is described, for example, in the following US patent. USP 3278457, USP 3278458, USP 3278459 USP 3427256, USP 3427334, USP 3427335 USP 3538043, USP 3829505, USP 3941849 USP 4355188, USP 4472560, USP 4721818

The complex metal cyanide complex is considered to have the structure of the following general formula (5) as shown in the above-mentioned known examples. ^{_{M 1 g [M 2 x (}} CN) y] b (H 2 O) c L d ···· (5) However, M ¹ is Zn (II), Fe (II ), Fe (III), Co
(II), Ni (II), Al (III), Sr (II), Mn (II), C
r (III), Cu (II), Sn (II), Pb (II), Mo (IV),
Mo (VI), W (IV), W (VI), etc., and M ² is Fe (I
I), Fe (III), Co (II), Co (III), Cr (II), C
r (III), Mn (II), Mn (III), Ni (II), V (IV),
V (V), etc., L is an organic ligand, g, b, x
And y are positive integers that change depending on the valence and coordination number of the metal, and c and d are positive numbers that change depending on the coordination number of the metal.

In the general formula (5), M ¹ is preferably Zn (II), and M ² is Fe (II), Fe (III), Co (II), Co.
(III) and the like are preferable. Examples of organic ligands include ketones, ethers, aldehydes, esters, alcohols,
There are amides.

The complex metal cyanide complex represented by the general formula (5) has a metal salt M ¹ Q _g (M ¹ is the same as above. Q is M
Anion that forms a salt with ¹ . ) And polycyanometallate (salt) P _e [M ² _x (CN) _y ] _f (M ² , x, y are the same as above. P is hydrogen, alkali metal, alkaline earth metal, etc. e and f are A positive integer determined by the valences and coordination numbers of P and M ² ) or a mixed solvent solution of water and an organic solvent is mixed, and an organic ligand L is added to the obtained composite metal cyanide. It is manufactured by removing excess solvent and organic ligand L after contacting.

Polycyanometallate (salt) P _e [M
^{In 2} _x (CN) _y ] _f , various metals such as hydrogen and alkali metals can be used for P, but lithium salt, sodium salt, potassium salt, magnesium salt, and calcium salt are preferable. Particularly preferred are conventional alkali metal salts, that is, sodium salts and potassium salts.

As the monovalent active hydrogen-containing compound used as the initiator, a saturated or unsaturated monohydric alcohol,
There are saturated or unsaturated monovalent active hydrogen containing compounds such as saturated or unsaturated monovalent phenols, saturated or unsaturated monovalent carboxylic acids, saturated or unsaturated monovalent thiols.

In the present invention, examples of the monoepoxide having 3 or more carbon atoms to be reacted with the monovalent active hydrogen-containing compound include alkylene oxides, haloalkylene oxides such as epichlorohydrin, glycidyl ethers and glycidyl esters. Preferred monoepoxides are ethylene oxide, propylene oxide, 1,2-
Butylene oxide, isobutylene oxide, 2,3-butylene oxide, styrene oxide and other alkylene oxides, and propylene oxide is particularly preferable. Two or more of these monoepoxides can be used in combination.

Examples of the silicon compound represented by the general formula (4) include chlorotrimethylsilane, chlorotriethylsilane and chlorotriphenylsilane. Chloromethylsilane is particularly preferred.

The polyether compound (B) has a molecular weight of 2
It is preferably 500 to 25,000, and particularly 250
0 to 6000 is preferable. When the molecular weight is less than 2500, the effect of the polyether monool produced from the polyether compound (B) as a high molecular weight plasticizer is lost and the curing efficiency is low, as described below. Stain resistance of the organic composition is not sufficient. Also,
When it exceeds 25,000, the viscosity becomes high and the workability is remarkably deteriorated.

The polyether compound (B) has a structure obtained by reacting a silicon compound represented by the general formula (4) with a polyether monool represented by the general formula (3). It does not have a hydroxyl group because it does not have a structure obtained by reacting a compound with a polyhydric alcohol or a polyether polyol. Therefore, in the absence of water, there is no possibility that the polyether compound (B) will react with the silyl group-containing polyether (A).

On the other hand, in the presence of water, the polyether compound (B) reacts with water to give a polyether monool represented by the general formula (3) and a compound having a silanol group represented by the general formula (6). It is considered to generate. ^{R 2 -X- (R 3 -O)} m -H ······ (3) (R 2, R 3, X, m are as defined _{^{above.) R 5 3 Si- [O}} -SiR 4 2 ] _N- OH ... (6) (R < ⁴ >, R < ⁵ >, n is the same as the above.)

In the coexistence of the compound having a silanol group and the polyether monool, the compound having a silanol group reacts with the reactive silyl group in the silyl group-containing polyether (A) to give the silyl group-containing polyether (A). Reduces the number of cross-linking points during curing. On the other hand, the produced polyether monool acts only as a high molecular weight plasticizer and is unlikely to react with the silyl group-containing polyether (A). The reduction of the number of cross-linking points and the formation of high molecular weight plasticizer
It is believed that one achieves plasticization.

The silyl group-containing polyether (A) in the present invention has at least one reactive silyl group represented by the general formula (1) in one molecule, and the main chain is substantially a polyether chain. It is a polymer, for example, JP-A-3-43449, JP-A-3-47825, and JP-A-3-725.
27, JP-A-3-79627, JP-B-46
-30711, Japanese Patent Publication No. 45-36319,
It is a polymer proposed in JP-B-46-17553, and a method for producing such a polymer is described in the above-mentioned document.

The silyl group-containing polyether (A) is preferably one having a main chain made of polyoxyalkylene as in the polyether compound (B). Such a compound is produced, for example, by introducing a reactive silyl group into the terminal of a polyoxyalkylene compound having a functional group.

The polyoxyalkylene compound having the functional group is a monovalent or polyvalent active hydrogen-containing compound having 3 or more carbon atoms in the presence of a catalyst similar to that used for producing the polyether compound (B). The hydroxyl-terminated one produced by reacting the monoepoxide of is preferred. The number of functional groups of the polyoxyalkylene compound is preferably 2 or more, and particularly preferably 2 to 4.

As the monoepoxide having 3 or more carbon atoms, the same ones as those exemplified above can be used. They may be used alone or in combination of two or more.

Examples of the polyoxyalkylene compound having the functional group include polyoxypropylene diol and polyoxypropylene triol. When used in the following methods (a) and (d), an olefin-terminated polyoxyalkylene compound such as an allyl-terminated polyoxypropylene monool can also be used.

The reactive silyl group in the present invention is represented by the following general formula (1). -SiZ _a R ¹ _3-a ... (1)

In the formula, R ¹ is an alkyl group having 1 to 20 carbon atoms or a haloalkyl group having 1 to 20 carbon atoms, and particularly an alkyl group having 8 or less carbon atoms, a phenyl group or a fluoroalkyl group. Particularly preferred are methyl group, ethyl group, propyl group, propenyl group, butyl group, hexyl group, cyclohexyl group, phenyl group and the like.

Z is a hydrolyzable group, and examples thereof include a halogen atom, an alkoxy group, an acyloxy group, an amide group, an amino group, an aminooxy group, a ketoximate group, an acid amide group and a hydride group.

Of these, the hydrolyzable group having a carbon atom preferably has 6 or less carbon atoms, and particularly preferably 4 or less carbon atoms. Preferred hydrolyzable groups are lower alkoxy groups having 4 or less carbon atoms, especially methoxy group, ethoxy group, propoxy group,
A propenyloxy group etc. can be illustrated. a is 1, 2 or 3, and particularly preferably 2 or 3.

The method of introducing the reactive silyl group represented by the general formula (1) into the polyoxyalkylene compound is not limited, but it can be introduced, for example, by the following method.

(A) A method of reacting a polyoxyalkylene compound having a functional group with an olefin group introduced at the terminal and a hydrosilyl compound represented by the general formula (7). HSiZ _a R ¹ _3-a (7) (wherein R ¹ , Z and a are the same as above).

As a method for introducing an olefin group, a compound having an unsaturated group and a functional group such as allyl isocyanate or allyl chloride is reacted with a terminal hydroxyl group of polyoxyalkylene polyol to form an ether bond, a urethane bond or an ester. Bonding, a method of bonding by a carbonate bond, or a method of introducing an olefin group into a side chain by copolymerizing by adding an olefin group-containing epoxy compound such as allyl glycidyl ether when polymerizing an alkylene oxide. To be

(B) A method of reacting the terminal of a polyoxyalkylene compound having a functional group with a compound represented by the general formula (8). R ¹ _3-a SiZ _a -R ⁶ NCO (8) (wherein R ¹ , Z, and a are the same as above. R ⁶ has 1 to 1 carbon atoms)
7 alkylene groups. )

Examples of the organosilicon compound represented by the general formula (8) include the following compounds. _{(C 2 H 5 O) 3} Si- (CH 2) 3 -NCO (CH 3 O) 3 Si- (CH 2) 3 -NCO (CH 3 O) 2 (CH 3) Si- (CH 2) 3 - _{NCO (CH 3 O) 3 Si} -NCO (CH 3 O) 2 Si (NCO) 2

(C) After the end of the polyoxyalkylene compound having a functional group is reacted with a polyisocyanate compound such as tolylene diisocyanate to form an isocyanate group end, the silicon compound represented by the general formula (9) is added to the isocyanate group. A method of reacting the W group.

R ¹ _3-a SiZ _a -R ⁶ W (9) (wherein R ¹ , R ⁶ , Z and a are the same as above. W is a hydroxyl group,
An active hydrogen-containing group selected from a carboxyl group, a mercapto group and an amino group (primary or secondary). )

(D) An olefin group is introduced at the terminal of a polyoxyalkylene compound having a functional group, and the olefin group is reacted with the mercapto group of the silicon compound represented by the general formula (9) in which W is a mercapto group. Method.

The silyl group-containing polyether (A) of the present invention
The molecular weight of is not particularly limited. For example, the molecular weight is 1000
~ 50,000 compounds can be used. The molecular weight is preferably 6,000 to 50,000. Especially 7000-3000
0 is preferred.

The curable composition of the present invention comprises 100 parts by weight of the silyl group-containing polyether (A) and 5 to 150 parts by weight of the polyether compound (B). The curable composition may contain various additives in addition to these two components. The additives that can be used are described below.

In the curing reaction of the reactive silyl group in the present invention, a curing accelerating catalyst for accelerating the curing may be used. Alkyl titanate as a curing acceleration catalyst,
Metal salts of carboxylic acids such as organosilicon titanate, bismuth tris-2-ethylhexoate, tin octylate and dibutyltin dilaurate, dibutylamine-2.
-Amine salts such as ethylhexoate and other acidic and basic catalysts may be used.

Reinforcing agents, fillers, thixotropic agents and the like may be used if necessary. Specifically, carbon black as a reinforcing agent, calcium carbonate, talc as a filler,
Clay, silica, etc., pigment iron oxide, chromium oxide,
Inorganic pigments such as titanium oxide and phthalocyanine blue,
Examples of organic pigments such as phthalocyanine green include thixotropic agents such as organic acid-treated calcium carbonate, hydrogenated castor oil, calcium stearate, zinc stearate, fatty acid amide, and finely divided silica.

The curable composition of the present invention comprises a sealing agent,
It can be used as a waterproofing agent, an adhesive, a coating agent and the like.

[0047]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. The compositions of the raw materials used in Examples and Comparative Examples are as follows. In addition, "part" showing quantity means a weight part.

Polymer A: Propylene oxide was polymerized using glycerin as an initiator and a zinc hexacyanocobaltate catalyst to obtain polyoxypropylene triol. Allyl chloride was added to this to convert the hydroxyl groups at both ends into allyl groups. Then, the obtained terminal allyl group-containing polyoxyalkylene was reacted with methyldimethoxysilane in the presence of a platinum catalyst to convert the allyl group into a methyldimethoxysilyl group, to obtain a polymer A having an average molecular weight of 20,000.

Plasticizer B-1: Propylene oxide is polymerized using n-butanol as an initiator and a zinc hexacyanocobaltate catalyst, and then an equimolar amount of chlorotrimethylsilane is reacted with a terminal hydroxyl group to give an average molecular weight. 6000 polyether compounds (plasticizer B-1) were obtained.

Plasticizer B-2: A polyether compound having an average molecular weight of 3000 (Plasticizer B-
2) was obtained.

Plasticizer B-3: Propylene oxide is polymerized using n-butanol as an initiator and a KOH catalyst, and then equimolar chlorotrimethylsilane is reacted with the terminal hydroxyl group to give polyacetic acid having an average molecular weight of 1500. An ether compound (plasticizer B-3) was obtained.

Plasticizer C-1: A polyether compound having an average molecular weight of 300 (Plasticizer C-
1) was obtained.

Plasticizer D-1: Propylene oxide was polymerized using n-butanol as an initiator and a zinc hexacyanocobaltate catalyst to obtain a polyether monool (plasticizer D-1) having an average molecular weight of 6000.

Plasticizer D-2: A polyether monool (plasticizer D-2) having an average molecular weight of 3000 was obtained in the same manner as in the plasticizer D-1.

Plasticizer D-3: Propylene oxide was polymerized using n-butanol as an initiator and a KOH catalyst to obtain a polyether monool (plasticizer D-3) having an average molecular weight of 300.

Example 1 100 parts of polymer A and 40 parts of plasticizer B-1 were kneaded, and the storage stability was evaluated by observing the change in viscosity after standing at 40 ° C. for 2 weeks. The results are shown in Table 1. Then add 0.75 tin octylate to this formulation.
Part and 0.25 part of laurylamine were added, a sheet body having a thickness of 2 mm was prepared and cured at 20 ° C. and 65% humidity for 14 days, and its tensile properties (stress at 50% tension /
M _50, breaking strength / T _b, were measured breaking elongation / E _b).
The results are shown in Table 1.

[Examples 2-3, Comparative Examples 1-4] Plasticizer B
-1 for each B-2, B-3, C-1, D-1, D-
The storage stability was evaluated in the same manner as in Example 1 except that 2 and D-3 were changed. A sheet was prepared in the same manner as in Example 1, and the tensile properties of the sheet were evaluated. The results are shown in Table 1.

Comparative Example 5 The storage stability and the tensile properties of the sheet were evaluated in the same manner as in Example 1 except that no plasticizer was added. The results are shown in Table 1.

[0059]

[Table 1]

Example 4 100 parts of polymer A, 50 parts of plasticizer B-1, 100 parts of calcium carbonate, 0.25 part of phenolic antioxidant, 0.25 part of benzotriazole ultraviolet absorber, 1 part of dibutyltin dilaurate and 1 part of vinyltriethoxysilane were kneaded to prepare a curable composition, and its workability and curing delay were evaluated. Then the same curable composition was added at 20 ° C. for 14 days and then at 30 ° C. for 14 days.
The stain resistance of the cured product cured under the conditions of one day was evaluated. The results are shown in Table 2.

The stain resistance and curing delay are evaluated by the following methods. Stain resistance: The cured product was exposed outdoors for one month and then visually evaluated. ⊚: No pollution at all ○: Slightly contaminated △: Dust adhered and highly contaminated ×: Very much dust adhered and severely contaminated

Curing delay; The tack free time of the composition at the initial stage and after 30 days at 50 ° C. was compared and evaluated. ⊚: Completely cured with no stickiness ○: Almost completely cured with little stickiness Δ: Curing progressed but stickiness was large ×: Curing failure

[Examples 5-6, Comparative Examples 5-8] Plasticizer B
-1 for each B-2, B-3, C-1, D-1, D-
2, except for changing to D-3, in the same manner as in Example 4,
The stain resistance and cure retardation were evaluated. The results are shown in Table 2.

[0064]

[Table 2]

[0065]

The plasticizer used in the present invention is a polyether compound having a trialkylsilyl group or a triarylsilyl group and having no hydroxyl group, and the terminal hydroxyl group is protected, so that the storage stability is good. . Since it does not react with the reactive silyl group in the silyl group-containing polyether, it has extremely excellent stain resistance compared to the plasticizers that have been used in the past, and has an excellent workability with less curing delay. It is something to demonstrate. The present invention has an effect that a cured product having a low hardness can be obtained by the plasticizer without lowering the strength of the cured product.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeyuki Ozawa 1150 Hazawa-machi, Kanagawa-ku, Yokohama, Kanagawa Prefecture Asahi Glass Co., Ltd. Central Research Laboratory

Claims (3)

[Claims] 1. A silyl group-containing polyether (A) containing at least one reactive silyl group represented by the following general formula (1).
A curable composition comprising 100 parts by weight and 5 to 150 parts by weight of a polyether compound (B) represented by the following general formula (2). -SiZ _a R ¹ _3-a (1) (In the formula (1), R ¹ is an alkyl group having 1 to 20 carbon atoms or a haloalkyl group having 1 to 20 carbon atoms. Z is hydrolyzable. group .a is an integer of 1 to ^{3) R 2 -X-. (R 3} -O) m - [SiR 4 2 -O] n -SiR 5 3 ······ (2) ( provided that (2) In the formula, R ² is an alkyl group having 1 to 8 carbon atoms, R ³ is an alkylene group having 2 to 18 carbon atoms or a haloalkylene group having 2 to 18 carbon atoms, and R ⁴ is 1 to 12 carbon atoms.
Is an alkyl group or an aryl group having 1 to 12 carbon atoms, and each R ⁴ may be different from each other. R ⁵ has 1 to 1 carbon atoms
It is an alkyl group having 12 or an aryl group having 1 to 12 carbon atoms, and each R ⁵ may be different from each other. X is -O-,
-COO-, -OCO- or -S-. m is 15 to 45
An integer of 0. n is an integer of 0 to 2. ) 2. A polyether monool represented by the following general formula (3) obtained by reacting a monovalent active hydrogen-containing compound with a polyether compound (B) and the following general formula: The curable composition according to claim 1, which is a compound obtained by reacting a silicon compound represented by (4). R ² —X— (R ³ —O) _m —H (3) (In (3), R ² is an alkyl group having 1 to 8 carbon atoms. R ³ is 2 to 18 carbon atoms. Or an haloalkylene group having 2 to 18 carbon atoms, where X is -O- or -COO.
-, -OCO- or -S-. m is an integer of 15 to 450. ) R ⁵ ₃ Si- [O-SiR ⁴ ₂ ] _n -Y (4) (In (4), R ⁴ is an alkyl group having 1 to 12 carbon atoms or 1 to 12 carbon atoms. An aryl group, each R ⁴
May be different from each other. R ⁵ is an alkyl group having 1 to 12 carbon atoms or an aryl group having 1 to 12 carbon atoms, and each R ⁵ may be different from each other. Y is a halogen atom.
n is an integer of 0 to 2. ) 3. The polyether compound (B) has a molecular weight of 25.
The curable composition according to claim 1, which is from 00 to 25,000.