JPH09194734A - Curable composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a curable composition excellent in storage stability, useful as a non-sag type sealant, and curable in the presence of moisture, comprising a specific organic polymer and readily dispersible cubic calcium carbonate. SOLUTION: This curable composition comprises (A) 100 pts.wt. of an organic polymer derived from (ii) a hydroxyl-bearing polyoxyalkylene polymer prepared by addition polymerization of an alkylene oxide to an initiator by use of (i) a multiple metal cyanide complex as catalyst, bearing a hydrolyzable silicon group of the formula [R is a divalent organic group; R<1> is a 1-20C (non) substituted monovalent hydrocarbon; X is OH or a hydrolyzable group; (a) is 1-3] and <=50ppm in the total amount of ionic: impurities and (B) 10-300 pts.wt. of readily dispersible cubic calcium carbonate 0.05-1.0μm in average particle size (pref. surface-treated with an organic matter).

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a curable composition which cures in the presence of moisture.

[0002]

2. Description of the Related Art Some examples of a polyether having a hydrolyzable silicon group capable of forming a siloxane bond by hydrolysis and having a high molecular weight or a crosslink are known in the prior art (for example, Japanese Patent Application Laid-Open No. Hei 3 (1999) -311). 47825, JP-A-3-72527, JP-A-3-79627, JP-B-46
-30711, JP-B-45-36319, JP-B-46-
17553).

Since these polyethers take a step of reacting with an organic halogen compound or the like under alkaline conditions as production conditions, salts are by-produced and it is necessary to remove them. It is known that the residual salt increases water absorption of a cured product obtained by curing a polyether having a hydrolyzable silicon group and deteriorates water resistance. Further, as the alkali in the above reaction, for example, an alkali metal, an alkali metal hydroxide, when using an alkali metal compound such as an alkali metal hydride, in some cases to the produced polyether having a hydrolyzable silicon group, The storage stability of a curable composition produced by adding a filler, a catalyst, etc. has sometimes deteriorated remarkably.

A method for removing ionic components derived from these salts or alkalis has been proposed (for example, JP-B-61-29371).

[0005]

On the other hand, a polyoxyalkylene having a hydroxyl group at a terminal, which is a raw material for a polyether having a hydrolyzable silicon group, generally adds an alkylene oxide to an initiator in the presence of a catalyst. Although produced by polymerization, in recent years, it has become industrially possible to use a metal compound other than an alkali metal compound as a polymerization catalyst for this alkylene oxide.

Since the polyether having a hydrolyzable silicon group has a high average molecular weight and a narrow molecular weight distribution, it is excellent in curability, but on the other hand, when a hydrolyzable silicon group is introduced into a terminal hydroxyl group, a raw material polyoxyalkylene is produced. The decomposition product of the metal catalyst at this time remains, and the storage stability of the curable composition produced by adding a filler, a catalyst and the like may be significantly deteriorated.

A composition obtained by adding a filler, especially calcium carbonate, to a polyether having a hydrolyzable silicon group is used as a sealing agent, an adhesive, etc., but poor storage stability leads to a reduction in pot life. As a result, the workability is deteriorated and it is a problem to be solved.

[0008]

The present invention is intended to improve such problems, particularly the storage stability of a curable composition. The organic polymer (A) and the organic polymer (A ) An average particle diameter of 0.05 to 1.0 μ per 100 parts by weight
m of easily dispersible cubic calcium carbonate (E) of 10 to 30
There is provided a curable composition containing 0 part by weight.

(Organic Polymer) Derived from a hydroxyl group-containing polyoxyalkylene polymer (C) obtained by polymerizing an alkylene oxide with an initiator using the complex metal cyanide complex (B) as a catalyst, and represented by the formula (1). Has a hydrolyzable silicon group and the total amount of ionic impurities is 50 ppm
The following organic polymers (A).

-R-SiX _a R ¹ _3-a (1) In the formula (1), R is a divalent organic group, and R ¹ is a carbon number of 1 to 20.
Is a substituted or unsubstituted monovalent hydrocarbon group, X is a hydroxyl group or a hydrolyzable group, and a is an integer of 1 to 3.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The organic polymer (A) is derived from a hydroxyl group-containing polyoxyalkylene polymer (C) obtained by polymerizing alkylene oxide with an initiator using a double metal cyanide complex (B) as a catalyst. It

By using the complex metal cyanide complex (B), M can be obtained rather than the conventional alkali metal catalyst.
It is possible to obtain a hydroxyl group-containing polyoxyalkylene polymer (C) having a smaller _w / _Mn , a higher molecular weight, and a lower viscosity.

As the complex metal cyanide complex (B), a complex containing zinc hexacyanocobaltate as a main component is preferable, and its ether and / or alcohol complex is particularly preferable. Its composition is essentially Japanese Patent Publication No. 46-2725.
Those described in No. 0 can be used. As ether, ethylene glycol dimethyl ether (glyme),
Diethylene glycol dimethyl ether (diglyme)
Etc. are preferred, and glyme is particularly preferred from the viewpoint of handling during production of the complex. The alcohol is preferably t-butanol.

As the initiator, a compound having 2 to 10 active hydrogens is preferable, a polyhydroxy compound is preferable, and a polyhydroxy compound having 2 to 8, particularly 2 to 4 hydroxyl groups is preferable. Specifically, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, neopentyl glycol, 1,
There are 4-butanediol, 1,6-hexanediol, glycerin, trimethylolpropane, pentaerythritol, diglycerin, sucrose and polyols having a lower molecular weight than the target product obtained by reacting these with alkylene oxide. These may be used alone or in combination of two or more. Further, an unsaturated group-containing monohydroxy compound such as allyl alcohol can also be used.

The organic polymer (A) of the present invention has a total amount of ionic impurities of 50 ppm or less. The present invention is particularly suitable when the ionic impurities include (a) a metal compound derived from the complex metal cyanide complex (B) and / or (b) an alkali metal compound. Ionic impurities are 3
It is preferably 0 ppm or less, and more preferably 20 ppm or less.

By reducing the amount of these metal impurities, the storage stability of the organic polymer (A) and the curable composition of the present invention is further improved, and the action of the curing catalyst is not hindered, resulting in excellent curing. Sex is obtained.

As the reducing method, the following (I) to
The method (III) can be mentioned. The method (I) is particularly preferable because it can reduce ionic impurities effectively and economically.

(I) A method in which an ionic impurity contained in a polymer is converted into a salt which is essentially insoluble in the polymer, and then the salt is removed from the polymer. Specifically, after adding a compound capable of reacting with an ionic impurity to form a salt essentially insoluble in the polymer, water and, if necessary, a nonionic surfactant,
There is a method of precipitating a salt by dehydration and then removing the salt. As the compound capable of forming a salt, hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, pyrophosphoric acid, acidic sodium pyrophosphate and the like are preferable. The precipitated salt can be removed by filtration or adsorption.

(II) A method of removing a ionic impurity by adding a solvent to a polymer and then bringing the polymer into contact with an anion exchange resin and / or a cation exchange resin.

(III) A method of removing a metal compound derived from the complex metal cyanide complex (B) after treatment with a pH buffer and optionally ammonia and a chelating agent, after adding an aliphatic alcohol and a chelating agent, A method of removing a metal compound derived from the composite metal cyanide complex (B), a method of removing a metal compound derived from the composite metal cyanide complex (B) after treatment with an oxidizing agent.

The ionic impurities referred to in the present invention are
Cations and anions such as zinc ions, cobalt ions, cyan ions, and chlorine ions resulting from the complex metal cyanide complex (B); sodium ions and potassium ions mixed as impurities in the step of producing the organic polymer (A). Such as an alkali metal ion, a halogen ion; a carboxylate ion produced by polyoxyalkylene being oxidized in the step of producing the organic polymer (A); an ester bond in the step of producing the organic polymer (A),
Includes all anions and cations such as catalytic metal salts added when forming carbonate bonds and the like.

The organic polymer (A) has a hydrogen atom in the hydroxyl group of the hydroxyl group-containing polyoxyalkylene polymer (C),
Those substituted with the group represented by the formula (1) are preferable.

The number of hydroxyl groups per molecule of the polyoxyalkylene polymer (C) used in the present invention is preferably 2-10. From the balance of physical properties such as viscosity, strength and elongation, it is particularly preferable that the number is 2 to 8, especially 2 to 4.

Preferred polymers (C) are polyoxypropylene diols, polyoxypropylene triols and polyoxypropylene tetraols. When used in the following methods (a) and (d), an unsaturated group-terminated polyoxyalkylene monool such as polyoxypropylene glycol monoallyl ether can also be used.

The polyoxyalkylene polymer (C) preferably has a hydroxyl value-converted molecular weight of 5,000 to 30,000, and more preferably 8,000 to 30,000.

In the present invention, the molecular weight in terms of hydroxyl value is the number of functional groups of the initiator used when producing the polyoxyalkylene polymer (C) having a terminal hydroxyl group and the molecular weight of the polymer per hydroxy group of polyoxyalkylene. It refers to the molecular weight calculated by the product of

The organic polymer (A) has a hydrolyzable silicon group represented by the formula (1). —R—SiX _a R ¹ _3-a (1) In the formula (1), R is a divalent organic group, and R ¹ has 1 to 20 carbon atoms.
Is a substituted or unsubstituted monovalent hydrocarbon group, X is a hydroxyl group or a hydrolyzable group, and a is an integer of 1 to 3.

R in the formula (1) is a divalent organic group. R
¹ is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms, preferably an alkyl group having 8 or less carbon atoms, a phenyl group or a fluoroalkyl group. Particularly preferred are a methyl group, an ethyl group, a propyl group, a butyl group, a hexyl group, a cyclohexyl group, a phenyl group and the like.

X is a hydroxyl group or a hydrolyzable group, and the hydrolyzable group is, for example, a halogen atom, an alkoxy group, an acyloxy group, an amide group, an amino group, an aminooxy group, a ketoximate group or 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. Examples of preferable X include a lower alkoxy group having 4 or less carbon atoms, particularly a methoxy group, an ethoxy group and a propoxy group. a is an integer of 1 to 3, preferably 2 or 3.

Next, the method for producing the organic polymer (A) will be described. In the organic polymer (A) in the present invention, a hydrolyzable silicon group can be introduced at the terminal of the hydroxyl group-containing polyoxyalkylene polymer (C) by the methods described in (a) to (d) below. Such a compound is liquid at room temperature, and the cured product retains flexibility even at a relatively low temperature,
When used as a sealing material or an adhesive, it has desirable characteristics.

(A) A method of reacting the terminal unsaturated group-introduced product (D) of the polymer (C) with the silicon hydride compound represented by the formula (2). HSiX _a R ¹ _3-a (2) However, in the formula (2), R ¹ , X, and a are the same as described above.

Terminal unsaturated group-introduced product (D) of polymer (C)
As a method for obtaining the above, after the terminal hydroxyl group OH of the polymer (C) is OM (M is an alkali metal), it is reacted with an unsaturated group-containing halogenated hydrocarbon such as allyl chloride or with an unsaturated group and a hydroxyl group. There is a method in which a compound having a reactive functional group is reacted with the polymer (C) to bond it with an ester bond, a urethane bond, a carbonate bond or the like. Further, when polymerizing the alkylene oxide in the production of the polymer (C), a method of introducing an unsaturated group into a side chain by copolymerizing an unsaturated group-containing alkylene oxide such as allyl glycidyl ether or a terminal as an initiator It can also be obtained by using an unsaturated group-containing monohydroxy compound.

(B) a compound having an isocyanate group and a hydrolyzable silicon group represented by the formula (1), and a polymer (C)
How to react.

(C) After reacting the polymer (C) with a polyisocyanate compound such as tolylene diisocyanate to form an isocyanate group terminal, the isocyanate group is reacted with the W group of the silicon compound represented by the formula (3). How to make.

R ¹ _3-a -SiX _a -R ⁵ W (3) In the formula (3), R ¹ , X and a are the same as described above, R ⁵ is a divalent organic group and W is It is an active hydrogen-containing group selected from a hydroxyl group, a carboxyl group, a mercapto group and an amino group (primary or secondary).

(D) Formula (3) wherein the unsaturated group of the terminal unsaturated group-introduced product (D) of the polymer (C) and W is a mercapto group.
The method of reacting the mercapto group of the silicon compound represented by.

The removal of ionic impurities is carried out from the above (a) to.
In each method (d), it is preferably carried out at an appropriate stage such as before reacting each silicon compound, and the total amount thereof is set to 50 ppm or less. The following method (e) or (e) is preferable.

(E) After converting the ionic impurities contained in the polymer (C) into a salt essentially insoluble in the polymer (C),
By removing the salt from the polymer (C) to reduce the ionic impurities contained in the polymer (C) to 50 ppm or less, a hydrolyzable silicon group is introduced into the polymer (C),
Let it be an organic polymer (A).

(F) After converting the ionic impurities contained in the terminal unsaturated group-introduced product (D) of the polymer (C) into a salt essentially insoluble in the terminal unsaturated group-introduced product (D), By removing the salt from the terminal unsaturated group-introduced product (D), 50 pp of ionic impurities contained in the terminal unsaturated group-introduced product (D) are obtained.
After adjusting to m or less, the compound with a terminal unsaturated group (D) and the formula (2)
The organic polymer (A) is obtained by reacting with a silicon hydride compound represented by

The molecular weight of the organic polymer (A) in the present invention is calculated based on the hydroxyl value-converted valence molecular weight of the polymer (C) as a raw material. The molecular weight is 5,000 to 30,000
Is preferred. When it is lower than 5,000, the cured product becomes hard and has low elongation. When it exceeds 30,000, the flexibility and elongation of the cured product are not problematic, but the viscosity of the polymer itself is remarkably increased and the practicality is lowered. Especially 8000-30
000 is preferred.

The average particle size used in the present invention is from 0.05 to
1.0 μm of easily dispersible cubic calcium carbonate (E)
For example, a suspension of calcium hydroxide to which fine cubic calcium carbonate is added and mixed as a nucleating agent is sprayed in a carbon dioxide gas stream, or the suspension is efficiently mixed with carbon dioxide gas by another reaction system such as a packed tower. It is possible to produce by sequentially growing crystals on the nucleating agent by frequently and frequently contacting.

For the purpose of the present invention, that is, for improving the workability (thixotropic property) of a composition such as a sealing material and improving the tensile properties of a cured product (high elongation, high strength), the calcium carbonate is used. It is more desirable that the is surface-treated with an organic substance.

Examples of the surface treatment agent include higher fatty acid organic compounds, resin acid organic compounds, aromatic carboxylic acid esters, cationic surfactants, nonionic surfactants and the like. Specifically, as the higher fatty acid-based organic substance, for example, a higher fatty acid-based alkali metal salt having 10 or more carbon atoms such as sodium stearate; as the resin acid-based organic substance, for example, abietic acid, neoabietic acid, d-
Pimaric acid, i-d-pimaric acid, vodocarpic acid, benzoic acid, cinnamic acid, etc .; aromatic carboxylic acids such as phthalic acid octyl alcohol, butyl alcohol, isobutyl alcohol, etc. esters, naphthoic acid lower alcohol ester, rosin Lower alcohol esters of acids and aromatic polycarboxylic acids, such as maleic acid adducts of aromatic dicarboxylic acids or rosin acids, or partial esterified products of different alcohols; and anionic surfactants such as dodecylbenzenesulfonic acid, Examples thereof include sulfuric acid ester such as sodium lauryl sulfonate and dodecylbenzene sulfonic acid, or a sulfonic acid type anionic surfactant.

These surface treatment agents may be used alone or in combination of two or more kinds. For example, a higher fatty acid-based organic substance and a resin acid-based organic substance are adsorbed so that the total amount thereof is in the range of 0.2 to 4 parts by weight with respect to 100 parts by weight of calcium carbonate, or a sulfate ester type or sulfone type. The acid type anionic surfactant and the ester of aromatic carboxylic acid can be added in a ratio of 5 to 20 parts by weight of the former with respect to 10 parts by weight of the latter. In the present invention, it is particularly preferable to use the anionic surfactant alone or in combination with other surface treatment agents.

These easily dispersible cubic calcium carbonates (E) may be used alone or in combination of two or more. In addition, the average particle size is 1 to 3μ
It is also possible to use together with so-called heavy calcium carbonate having an average particle size of 4 to 20 μm obtained by crushing and classifying crystalline ones of spindle-shaped calcium carbonate or limestone produced by the sedimentation method of m.

The easily dispersible cubic calcium carbonate (E) is
10 to 300 parts by weight is used with respect to 100 parts by weight of the organic polymer (A). Preferably 30 to 200 parts by weight are used. When the amount used is less than 10 parts by weight, the thixotropic property of the resulting composition is insufficient, and the effect of improving the tensile properties after curing is also insufficient. If it exceeds 300 parts by weight, the tensile properties are significantly deteriorated.

In the present invention, a curing catalyst may be used to accelerate the curing of the organic polymer. As the curing catalyst, compounds known as catalysts for hydrolysis and condensation reactions of hydrolyzable silicon groups can be used. That is, metal salts of carboxylic acids such as alkyl titanates, organosilicon titanates, tin octylate and dibutyltin dilaurate; amine salts such as dibutylamine-2-ethylhexoate; and other acidic catalysts and Basic catalysts can be used. The amount of the curing catalyst used is the organic polymer (A) 1
0.001 to 10 parts by weight, particularly 0.00
It is preferable to use 01 to 5 parts by weight.

The composition of the present invention may further contain other fillers, reinforcing agents, anti-sagging agents, adhesive agents, etc., if necessary. As the filler, talc, clay, silica and the like, as the reinforcing agent, carbon black, fine powder silica and the like, as the pigment, iron oxide, chromium oxide, inorganic pigments such as titanium oxide and phthalocyanine blue, organic such as phthalocyanine green Examples of the pigment include hydrogenated castor oil, calcium stearate, zinc stearate, and fine powder silica as an anti-sagging agent, and aminosilane, epoxysilane and the like as an adhesive agent.

Any plasticizer may be used in the present invention. As the plasticizer, known plasticizers can be used, and specifically, phthalates such as dioctyl phthalate, dibutyl phthalate, and butylbenzyl phthalate; dioctyl adipate, isodecyl succinate, dibutyl sebacate, butyl oleate, and the like. Aliphatic carboxylic acid ester; glycol ester such as pentaerythritol ester; phosphoric acid ester such as trioctyl phosphate, tricresyl phosphate; epoxy plasticizer such as epoxidized soybean oil and benzyl epoxystearate; chlorinated paraffin etc. Alternatively, it can be used as a mixture of two or more kinds.

The composition of the present invention may further contain various known additives. As the additives, adhesion promoters such as phenol resin and epoxy resin, various antiaging agents, ultraviolet absorbers and the like can be used.

The room-temperature-curable composition of the present invention is stable for a long period of time in a sealed state, can be cured at room temperature in the presence of moisture, and can be used particularly for elastic sealants and adhesives.

[0052]

【Example】

(Synthesis of Polymer) Using a glycerin-propylene oxide adduct having a molecular weight of 1000 as an initiator and a zinc hexacyanocobaltate glyme complex as a catalyst, a hydroxyl value of 10.
A 0 mg KOH / g polyoxypropylene polymer was obtained. This was reacted with allyl chloride in the presence of alkali to convert the terminal hydroxyl group into an allyloxy group to obtain a polymer containing impurities such as metal ions.

(Polymer purification a) To 1 kg of a polymer containing impurities such as metal ions, 5 g of a polyoxypropylene polymer having a molecular weight of 10,000 and obtained by block-polymerizing ethylene oxide at the terminal 10%, 50 g of water, and 10 g of sodium acid pyrophosphate were added. In addition, it stirred at 90 degreeC for 1 hour. Then, after distilling off water under reduced pressure at 90 ° C., Kyoward 600 (synthetic magnesia silicate, manufactured by Kyowa Kagaku)
Was added under reduced pressure at 90 ° C. for 1 hour, and then 2 liters of hexane was added to dissolve the polymer. Impurities were removed by filtration using filter paper. Then, hexane was distilled off under reduced pressure to obtain a purified polymer A1.

(Polymer purification a) (Polymer purification a) except that 1 g of sodium acid pyrophosphate was added
Purified polymer A2 was obtained in exactly the same manner as.

(Polymer Production Example 1) Methyldimethoxysilane was added to the polymer A1 obtained in (Polymer purification A) using chloroplatinic acid as a catalyst to give 0.17.
A polymer P1 having a hydrolyzable silicon group at the end of mmol / g was obtained. The content of ionic impurities contained in this product is shown in Table 1.

(Polymer Production Example 2) Methyldimethoxysilane was added to the polymer A2 obtained in (Polymer purification b) using chloroplatinic acid as a catalyst to give 0.16.
A polymer P2 having a hydrolyzable silicon group of mmol / g at the end was obtained. The content of ionic impurities contained in this product is shown in Table 1.

Examples and Comparative Examples Calcium carbonate shown in Table 2 (the numbers in Table 2 are parts by weight) and dioctyl phthalate 5 per 100 parts by weight of the organic polymer P1 or P2.
0 parts by weight, 3 parts by weight of hydrogenated castor oil and 1 part by weight of a phenolic antioxidant were added and kneaded using a 3-roll paint roll to obtain a composition. To this, 2 parts by weight of dibutyltin diacetylacetonate as a curing agent was added,
The change with time in viscosity at 65 ° C. and 65% humidity was measured with a B8R type viscometer (No. 6 rotor) at 5 rpm, and the time until the viscosity reached 800,000 cP was defined as the pot life. Also JIS
The slump (length) at 35 ° C. was measured based on A5758.

Further, the composition obtained in the same manner was sealed and stored in a gear oven at 60 ° C. for 2 weeks, after which a curing agent was added and the pot life was examined in the same manner. Table 2 shows the pot life.

Table 2 shows the average particle diameter and particle shape of the calcium carbonate used in Examples and Comparative Examples.

As shown in Examples 1 to 4 in Table 3, compositions containing P1 and calcium carbonate satisfying the conditions of the present invention were used at an initial pot life and at 60 ° C. for 2 weeks and after storage stability test. The time difference is small. On the other hand, as shown in Comparative Examples 1 to 4 in Table 4, the compositions having the same combination of P2 showed a remarkable decrease in pot life.

On the other hand, as shown in Comparative Examples 5 to 8 in Table 5,
The composition containing only calcium carbonate that does not satisfy the conditions in the present invention does not depend on the amount of ionic impurities in the polymer and has a small decrease in pot life, but has an extremely large slump and is difficult to use as a non-sag type sealant. Is.

[0062]

[Table 1]

[0063]

[Table 2]

[0064]

[Table 3]

[0065]

[Table 4]

[0066]

[Table 5]

[0067]

A curable composition having excellent storage stability and suitable for use as a non-sag type sealant can be obtained.

Claims (7)

[Claims] 1. An average particle diameter of 0.05 to 1.0 μm based on 100 parts by weight of the following organic polymer (A) and organic polymer (A).
m of easily dispersible cubic calcium carbonate (E) of 10 to 30
A curable composition containing 0 part by weight. (Organic Polymer) Hydrolyzate derived from a hydroxyl group-containing polyoxyalkylene polymer (C) obtained by polymerizing an alkylene oxide with an initiator using a double metal cyanide complex (B) as a catalyst and represented by Formula (1). Having a degradable silicon group,
An organic polymer (A) having a total amount of ionic impurities of 50 ppm or less. —R—SiX _a R ¹ _3-a (1) In the formula (1), R is a divalent organic group, and R ¹ has 1 to 20 carbon atoms.
Is a substituted or unsubstituted monovalent hydrocarbon group, X is a hydroxyl group or a hydrolyzable group, and a is an integer of 1 to 3. 2. The curable composition according to claim 1, wherein the surface of the easily dispersible cubic calcium carbonate (E) is treated with an organic substance. 3. The curable composition according to claim 2, wherein the organic substance used for the surface treatment of the easily dispersible cubic calcium carbonate (E) is an anionic surfactant or a mixture containing the same. 4. The curing according to claim 1, wherein the ionic impurities include (a) a metal compound derived from the complex metal cyanide complex (B) and / or (b) an alkali metal compound. Sex composition. 5. The organic polymer (A), wherein the ionic impurities contained in the polymer (C) are converted into salts essentially insoluble in the polymer (C), and then the salt is added to the polymer (C). ), The ionic impurities contained in the polymer (C) are reduced to 50 p
The curable composition according to any one of claims 1 to 4, which is an organic polymer obtained by introducing a hydrolyzable silicon group into the polymer (C) after adjusting it to pm or less. 6. The organic polymer (A) contains an ionic impurity contained in the terminal unsaturated group-introduced product (D) of the polymer (C),
After the salt is essentially insoluble in the terminal unsaturated group-introduced product (D), the salt is removed from the terminal unsaturated group-introduced product (D) to be contained in the terminal unsaturated group-introduced product (D). An organic polymer obtained by reacting the terminal unsaturated group-introduced product (D) with the silicon hydride compound represented by the formula (2) after adjusting the ionic impurities to 50 ppm or less.
A curable composition according to any one of to 4. HSiX _a R ¹ _3-a (2) In formula (2), R ¹ is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms, X is a hydroxyl group or a hydrolyzable group,
a is an integer of 1 to 3. 7. A polymer (C) having a hydroxyl value-converted molecular weight of 50.
Curable composition in any one of Claims 1-6 which is 00-30000.