JPH0489860A - Room temperature curing composition and its cured material - Google Patents

Abstract

PURPOSE:To obtain the title composition which cures at room temperature by moisture in the air to give a cured material having low modulus and improved extensibility by mixing a specified polymer, an organosilane (partial hydrolyzate thereof), and a curing catalyst. CONSTITUTION:1-20 pts.wt. organosilane of formula IV (wherein R<8> is a 1-8C monovalent hydrocarbon group; Q is a hydrolyzable group; (c) is 3 or 4) (partial hydrolyzate thereof) and 0-5 pts.wt. curing catalyst are incorporated into 100 pts.wt. polymer having terminal hydroxyl or hydrolyzable groups, which has a principal chain of formula I [wherein R<1> is a 2-4C divalent hydrocarbon group; R<2> is H or methyl; Z is a 1-20C (un)substituted divalent hydrocarbon group, a 1-20C divalent organic group containing an ether linkage, an ester linkage or NH, or a group of formula II {wherein R<3> and R<4> are each a 1-6C (unsubstituted) monovalent hydrocarbon group; R<5> is a 1-6C divalent hydrocarbon group which may contain NH; (l) is O to 50}; (n) is 20 to 200] with terminal groups of formula III [wherein R<6> is a 1-6C divalent hydrocarbon group or a 1-6C divalent group containing a thioether group; R<7> is an (un)substituted hydrocarbon group; X is a hydroxyl group; Y is a hydrolyzable group; (a) and (b) are each 0 to 3, provided that 1<=a+b<=3].

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a room-temperature curable composition, particularly a novel compound having a hydroxyl group or a hydrolyzable group at both ends of the molecule, which is suitable as a sealing material for buildings. The present invention relates to a room-temperature curable composition comprising a polymer as a main material, and a cured product obtained by curing this composition.

(Prior Art) Various types of room-temperature curable compositions based on polyoxyalkylene having a hydrolyzable group at the end of the molecule are already known (Japanese Patent Publication No. 61-18582, Japanese Patent Publication No. 18582, 61-29379, Special Publication No. 6118569, Special Publication No. 50-57393, Special Publication No. 61-36008
No., Special Publication No. Sho 62-34763, Special Publication No. Sho 62-3476
(see Publication No. 4), all of these generate siloxane bonds in the presence of moisture in the air and are crosslinked and cured.

Also, as for this type of room temperature curable composition, there are also known compositions based on polyoxyalkylene having a silanol group at the end of the molecule (Japanese Patent Laid-Open Nos. 55-115448 and 1982-123648). , Japanese Patent Publication No. 55-1251
No. 52, JP-A-55-131050, JP-A-2-36
250), these are crosslinked in the presence of moisture using a silane having at least two hydrolyzable groups bonded to a silicon atom in one molecule or a partial hydrolyzate thereof as a crosslinking agent in the presence of moisture to form a siloxane. It forms a bond and hardens.

Although these room-temperature curing compositions are mainly used as sealants for construction, they are also used as G-song materials for joints to protect their waterproof function from external forces such as temperature fluctuations, earthquakes, vibrations, and wind. In addition, the physical properties after curing are required to be low modulus and high elongation.

(Problem to be Solved by the Invention) However, the polyoxyalkylene compound used to produce this type of composition can be produced with a molecular weight of up to about 5,000; The resulting composition has a high modulus and low elongation, which has a disadvantage in that it has poor functionality as a building sealant and its uses are limited.

Therefore, for this polyoxyalkylene compound, a polyoxyalkylene polymer having unsaturated groups at both ends of the molecule is subjected to a hydrosilylation reaction with an organohydrodiene polysiloxane having two Si tl groups in one molecule. A method of making a polyoxyalkylene polymer with a high molecular weight has also been proposed (see Japanese Patent Publication No. 59-25809). Although this method makes it possible to obtain a sealing material with low modulus and high elongation, Organohydrodiene polysiloxanes having two =SiH groups have the disadvantage that they are expensive and impractical to use industrially.

(Means for Solving the Problems) The present invention relates to a room-temperature curable composition and a cured product thereof that solve the above-mentioned disadvantages. [Here, R1 is a divalent hydrocarbon group having 2 to 4 carbon atoms, R2 is a hydrogen atom or a methyl group, and 2 is an unsubstituted or substituted divalent hydrocarbon group having 1 to 20 carbon atoms, or a divalent hydrocarbon group having 1 to 2 carbon atoms. 2 groups containing an ether bond, an ester bond, or a -N)l-bond, or a formula (2) (where R3 and R4 are unsubstituted or substituted monovalent hydrocarbon groups having 1 to 6 carbon atoms, R5 is a divalent hydrocarbon group having 1 to 6 carbon atoms or a divalent hydrocarbon group having 1 to 6 carbon atoms containing an -NH- group, k is an integer of O to 50;
n is an integer of 20 to 200] At the end of the molecule, the formula % formula % (3) (where R6 is a divalent hydrocarbon group having 1 to 6 carbon atoms or a thioether bond having 1 to 6 carbon atoms) R7 is an unsubstituted or substituted monovalent hydrocarbon group, X is a hydroxyl group, Y is a hydrolyzable group, a and b are 0.12 or 3, and 1≦a+
100 parts by weight of a polymer having a hydroxyl group or hydrolyzability at the end of the molecule, which has a group represented by b≦3);
) - Formula R'4 - cslQe (where R8 is the number of carbon atoms
~8 monovalent hydrocarbon group, Q is a hydrolyzable group, C is 3
or 4) A room temperature curable composition comprising 1 to 20 parts by weight of organosilane or a partially hydrolyzed product thereof and O to 5 parts by weight of a curing catalyst; The gist is a cured product.

That is, as a result of various studies aimed at developing a novel room temperature curable composition that is useful as a building sealant, the present inventors found that the main chain consists of the above formula (1), and the molecular button terminal When an organosilane represented by the general formula R84-esIQe or a partial hydrolyzate thereof and a curing catalyst are added as the above-mentioned (original) components to the polymer (a) having a group represented by the above-mentioned formula (3), They discovered that this material cures at room temperature and becomes a sealing material with low modulus and high elongation, and conducted research on the manufacturing method of each component used here and the blending ratio of these ingredients, and completed the present invention.

This will be explained in further detail below.

(Function) The present invention relates to a room-temperature curable composition that is useful as a building sealant because of its low modulus and high elongation, and to a cured product obtained by curing the same.

The main chain of the polymer as component a) constituting the room temperature curable composition of the present invention is represented by the formula 0 (2) in terms of its main chain or woody structure, and R1 or 2 carbon atoms such as ethylene, propylene, or butylene groups. ~4 two hydrocarbon groups, 2 or -CH2
-1-CH2CH2-, -CH2CH2CH2-, -C
H2CH2CH2CH2CH2-1-CH2CH2CH
2CH2CH2CH2CH2-1-Ca Ha-3CH
2CH(C)1208)-1-CH2(Kano) CIICH
(Kano) Unsubstituted or substituted divalent hydrocarbon group having 1 to 20 carbon atoms exemplified by CH2-, -CH2C820C)1
2C82CH2-1-CH2C)120CLCToOC
H2, -CH2C00CH2CH20COCH2-1-
CH2COOCH2(CH3)CHOCOClb-, a divalent organic group containing an ether bond or an ester bond having 1 to 20 carbon atoms, or -CH2CH2NH
CH2CH2-1-CH2CH2NHCH2CH2NH
CH2Ctl.

or a divalent organic group containing a monoNH- group represented by the formula % (2), where R3 and R4 are a methyl group, ethyl group, propyl group, butyl group, an alkyl group, or a cyclohexyl group. cycloalkyl groups such as hinyl groups, alkenyl groups such as allyl groups, aryl groups such as phenyl groups, or some or all of the hydrogen atoms bonded to the carbon atoms of these groups are replaced with halogen atoms, cyano groups, etc. R5 is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 6 carbon atoms selected from chloromethyl group, trifluoropropyl group, cyanethyl group, etc., and R5 is an ethylene group, propylene group, butylene group, etc. 6 divalent hydrocarbon group, or -C
H2C820C(:H2C)+2-, -CH2C82
0C+ (1N shown as 2CH2NHCH2CH2 etc.
divalent hydrocarbon group containing H- group, A is selected from siloxane-containing groups, where A is an integer from 0 to 50, and n is 20 to 2;
It is selected from siloxane-containing groups that are an integer of 00, and is represented by the formula % formula % (3) at the end of its molecular chain, and R6 is a divalent hydrocarbon having 1 to 6 carbon atoms similar to R1. group or -CH2C)125C82C82C)12
-1-CH2CH2CH2S-CH2CH2C) I, -
A divalent group containing a thioether bond represented by R7, R7 is an unsubstituted or substituted monovalent hydrocarbon group similar to R3 and R4 described above, X is a hydroxyl group, and Y is a methoxy group or ethoxy group which may be the same or different. , alkoxy groups such as propoxy group, butoxy group, methoxyethoxy group, ethoxyethoxy group; acyloxy groups such as acetoxy group, propionoxy group, butyroxy group; alkenyloxy groups such as propenyloxy group, isobutenyloxy group, dimethyl ketoxime N-methylamino group, N-ethylamino group, N-propylamino group, N-butylamino group, N-methylamino group, N-ethylamino group, N-propylamino group, N-butylamino group,
, N-dimethylamino group, N,N-diethylamino group, amino group such as cyclohexylamino group, amide group such as N-methylacetamide group, N-ethylacetamide group, N-methylhenzamito group, N,N-dimethyl A hydrolyzable group such as an aminooxy group, an aminooxy group such as an N,N-diethylaminooxy group, where a, b is 0.1.
2 or 3 and 1<a+b<3.

Industrially, this polymer having mainly polyoxyalkylene bonds can only be produced using a polyoxyalkylene polymer having unsaturated groups at both ends of the molecule.

That is, regarding this, first, the general formula % formula % (5 ) The organosilane represented by is subjected to an addition reaction in a hydrosilylation reaction to synthesize a polymer represented by the following formula having an unsaturated group and a hydrolyzable group at one end.

(X)-(Y)bsj(C)12)-20(R'0),
C0CR'-CH2""...(6) This reaction can be carried out by a known method, and therefore, the above formula (4) can be used for this reaction.
0.1 to 1.000 ppm, preferably 1 to 1.000 ppm of platinum metal based on the total amount of the polyoxyalkylene polymer represented by the formula (5) and the organosilane represented by the formula (5).
Add 1100 pp of platinum catalyst for addition reaction, such as finely powdered platinum, chloroplatinic acid, chloroplatinic acid-olefin complex, chloroplatinic acid-hinylsiloxane complex, etc., and add triene, xylene, etc. as necessary. 60 in the presence of solvent
The reaction may be carried out by heating at ~200°C for about 0.5 to 5 hours.

The thus obtained polyoxyalkylene polymer represented by the above formula (6) has two primary amino groups in one molecule represented by the general formula % (7) (2 is as above). By chemically reacting with a compound having the general formula %, it is possible to obtain a polymer mainly composed of polyoxyalkylene bonds as the a) component in the present invention, which has a hydroxyl group or a hydrolyzable group at the end of the molecular chain represented by the general formula %. I'll come.

Incidentally, the amino group-containing compound represented by the above-mentioned formula (7) used herein is the formula 8 (%FC)12). N) 12 etc. are exemplified.

In addition, the synthesis of the polymer as component (a) used in the present invention includes a polyoxyalkylene polymer having an unsaturated group, for example (vinyl group), at both ends of the molecular chain represented by the general formula (4) above; By reacting in advance a compound containing two primary amino groups in one molecule represented by the above general formula (7), a polymer having one unsaturated group at both ends represented by the general formula % is produced. After synthesizing, this is combined with a mercapto group-containing organosilane represented by the formula % (9), where R9 is a divalent hydrocarbon group having 1 to 6 carbon atoms, and d is O or 1, as a radical-forming catalyst. It can be obtained by reacting with benzoyl peroxide, bis(2,4-cyclohenzoyl) peroxide, di-t-butyl peroxide, 2,5-dimethyl −
Peroxides such as di-t-butylperoxyhexane, t-butylperhenzoate, t-butylperoxyisopropyl carbonate, dicumyl peroxide, ammonium persulfate, N,N-bisisobutyronitrile, etc. A radical-forming catalyst such as a persulfate or a diazo compound, or an alkali catalyst such as an alkali metal alkoxide is added in an amount of 0.01 to 5 parts by weight, especially per 100 parts by weight of the polyoxyalkylene polymer represented by (6) above. It is sufficient to add 0.05 to 3 parts by weight and heat the reaction at a temperature of 30 to 150°C for about 5 minutes to 5 hours. In this case, infrared rays, ultraviolet rays, It may be irradiated.

The polymers produced in this way as component a) are as follows: (Cf(30) 3SiC3H6SC3H60E CH
3CN (CHs) O] ao-C0CHCHsCH
zNHCH2CHzNHC'thCHCHsCrJO-
[CH3CN (CH3) Oko aocJ6scJ6
scsHssi (OCH3) 3, (CH30) 3
sic 3Hasc 3Hao [CH2C)l (
CH3) 0 ko. .

C0CHCIbCH2NHCH2CH2N)lc82G
HzNH(:82C1(CtbCOO-[CH3CN
(CH3) 0 ] aocsHsscsHssi (
OCH3) s, (C)lsO)3sic3H6sc3
Hao [CH3CN(CH3)-0] ao-COC
)IcHs C1(2NHCH2C00CH2CH20
COCH2NHCH2CHC)h COO[CH3CN
(CH3) 0] a. C3H3SC3H6Si
(OCH3) 3, (CH30) 3sic3) 1aS
C3) 1aO[CH3CN (CH3) 0 ] a.

-COCHC83G)+2NHc3H6(CH3) 2
siO [(CH3) 2siO co,. -5i(Clh
)2C3HsN)ICH2CHCH3COO[(:82
CH(CH3)O] a.

-C3H6SC3H6Si (OCH3) 3 is exemplified, but these are industrially relatively easy to use unsaturated group-containing polyoxyalkylene compounds represented by the general formula (4) as starting materials with molecular weights up to about JOOO. Because they can be manufactured, they can have high molecular weights, giving the room temperature curable compositions of the present invention the advantage of providing low modulus, high elongation sealants.

Further, the organosilane as a component constituting the room temperature curable composition of the present invention is represented by the general formula R84-cs+Qc, where R8 is 83, one unsubstituted or substituted hydrocarbon group similar to R4, Q is ×, a hydrolyzable group similar to Y, C
is 3 or 4, such as methyltrimethoxysilane, methyltri(methylethylketoxime)silane, methyltrifluorovinyloxysilane, methyltriacetoxysilane, and the methyl group of these silane compounds can be replaced with a vinyl group, phenyl group, trifluoro Examples include silanes with propyl groups, etc., and partial hydrolysates of these.
If the amount is less than 1 part by weight per 100 parts by weight of the polymer as a component, the storage stability of the room temperature curable composition of the present invention will be poor, and if the amount is more than 20 parts by weight, the cured product of the present invention will become hard. However, the amount should be in the range of 1 to 20 parts by weight, and the preferable range is 2 to 10 parts by weight.

Furthermore, the curing catalyst as component c) constituting the room temperature curable composition of the present invention may be a known one, including tin carboxylates such as tin naphthenate, tin caprylate, tin oleate, and dibutyltin dibutylchloride. Tin compounds such as acetate, dibutyltin diacetate, dibutyltin dilaurate, dibutyltin diralate, diphenyltin diacetate, dibutyltin oxide, dibutyltin dimethoxide, dibutylbis(triethoxysiloxy) soot, dibutyltin dibenzyl maleate, tetra Isopropoxy titanium, tetra-n-butoxy titanium, tetrakis (2
Examples include titanate esters or titanium chelate compounds such as -ethylhexoxy) titanium, dipropoxybis(acetylacetona)titanium, and titanium isobroboxyoctylenoglycol. This catalyst is for accelerating the curing of the composition consisting of the above-mentioned components (a) and (b), and although it may not be necessary to use it in some cases, it is usually used to accelerate curing. A) It is preferable to use the polymer in an amount of 5 parts by weight or less, particularly 1 part by weight or less per 100 parts by weight of the polymer.

In order to increase the activity of this catalyst, amines such as octylamine and laurylamine, imidacillin, tetrahytropyrimidine, 1,8-diaza-bicyclo(5,4,0)undecene-7 (DBU), etc. cyclic amidine, super strong base such as guanidine, guanidyl group-containing such as tetramethylguanidylpropyltrimethoxysilane, tetramethylguanidylpropyldimethoxysilane, tetramethylguanidylpropyltris(trimethylsiloxy)silane Silane, its partial hydrolyzate, guanidyl group-containing siloxane, etc. may be used in combination.

The room temperature curable composition of the present invention is as described above
It can be obtained by uniformly mixing predetermined amounts of the components, but if necessary, a silane containing a propenyloxy group or a partial hydrolyzate thereof may be added as a crosslinking agent. It is also possible to add fillers to strengthen or increase the volume. The fillers may be of the known types, and thus include, among others, fumed silica, pyrogenic silica, precipitated silica, milled silica, fused silica powder, diatomaceous earth, iron oxide, zinc oxide, titanium oxide, barium oxide, magnesium oxide, etc. metal oxides, metal carbonates such as calcium carbonate, magnesium carbonate, zinc carbonate, metal hydroxides such as cerium hydroxide, aluminum hydroxide, glass fibers, glass wool, carbon black, fine mica, asbestos, or their surfaces. Examples include those treated with hydrophobization using silane.

In addition, this composition may further contain thixotropic agents such as polyethylene glycol and its conductor, pigments, dyes, antioxidants, antistatic agents, antimony oxide, chlorinated paraffin, etc. It is optional to add fuel, thermal conductivity improvers such as boron nitride, aluminum oxide, etc., and reactive organic groups such as amino groups, epoxy groups, mercapto groups, etc. are used as adhesion imparting agents. Various conventionally known additives such as organic silicon compounds and so-called silane coupling agents may be added.

In order to use the room-temperature curable composition of the present invention as a sealing material for construction, it may be applied as is, but for convenience during use, it may be coated with toluene, xylene, petroleum ether, etc. It may be diluted with solvents such as hydrocarbon solvents, ketones, and esters. May be blended.

(Example) Examples of synthesizing the polymer used as component (a) used in the present invention, examples of the present invention, and comparative examples will be given below.

Synthesis Example 1 Formula CH2=CHCH2O[CH3CN (CH3)0
] 300 g of toluene was added to 477 g of a polyoxyalkylene polymer represented by 80COC(CH3)-CH2, both ends of which were capped with vinyl groups, and dehydrated for 1 hour at a toluene reflux temperature. Add 3.0 g of an amino group-containing compound represented by the formula %, and add 100
℃ for 3 hours, and then a mercapto group-containing alkoxysilane 19.6 of formula 8)
g and 10 g of N,N-bisisobutyronitrile as a catalyst were added, the reaction was carried out at 100 to 110°C for 3 hours, and stripping was performed for 2 hours under the conditions of 100°C and 10 mmHg, and the viscosity at 25°C was 12 .00
A liquid having a temperature of 0 cS was obtained, which was a polymer represented by the formula 8 (hereinafter abbreviated as polymer 2).

Synthesis Examples 2 to 4 Al H2NC82C)IJl(CH2Cl(J)1
25.2g, b) H2NCH2C00CH2CH2
0COCH2NH28.8g, c) H2NC3Ha
(CH3)2sjo [(CH3)25io]
to-5i (CH3) 2 C3H6NH249
, 4g was used, but the reaction was carried out in the same manner as in Synthesis Example 1, and the following three types of polymers were obtained.

Polymer I+ (CH30)3 SiC3H6SC3HaO[CH3
CN(CH3)Oko. . -COCHCH3CH2NH
CH2CH2NHCt(2CH2CHCH3COO-[
CH3CN (C)13)0 ] a. C3H6SC3
H6Si (OCH3)3, Polymer II+ (CH30)s5iC3HaSC3HaO[CH2
C) l (CH3) O] ao-COC1(CH3C
H2NHCH2COOCH2CH20COCH2NHC
H2CHCH3COO-[CH3CN (CH3)0
] a. C3H6SC3HaSi (OCH3)! , polymer ■ (CHaO) 3 SiC3HaSC3HaO[CH
3CN (CH3) Oko ao-COC)lCH3C
H2NHC3H6(CH3) 2siO[(CH3)
>SiO]+. -5i (CH3) 2C3)18N
HC)12cl(C)+3cOO[CH3CN (CH
3)0] ao-C3)+6SC3H8(C;83)
3 Synthesis Examples 5 to 7 After dehydrating the polyoxyalkylene bomber whose molecule end is capped with a vinyl group used in Synthesis Example 1 in the same manner as Synthesis Example 1, 477 g of this was treated with chloroplatinic acid as a catalyst. Add 05g of 05% isopropanol solution and heat to 80°C.
10.6 g of methyldimethoxysilane was gradually added dropwise to the mixture, and the reaction was continued for 2 hours at 80 to 90 tons.
After that, after cooling to a temperature of 25℃, add the following 3
Species of amino group-containing compounds cl), e), f) d) H2NCH2CH20CH2C) 12N) I2,5
．． 2g, e) HJCHzCOOCH2CToOCOC
H2NH28, Bg, f) H2NC3Ha (CH3)
2510 [(CH3) 2siOco,.

When 249.4 g of Si (CH3) 2C3H6NH was added and reacted at 100°C for 3 hours, the following three types of polymers were obtained.

Polymer ■ (CH30) 2 (CH3) 5iC3H60[CH
2CH(CH3)0 ] ao-CDCHCH3CH
zNHCH2CH20CH2CH2NHCH2CHCH
3COD[CH2CH(CH3)O] aoCJsSi
(CHs) (OCH3)2, polymer ■ (CH30) 2 (CH3)5jC3H60[CH2
CH(C1(3)O] 80COCHCH3CH2N1
(C) 12C (IOC) 12C) 12 (ICDC) I2
NHC)12CHC)13COCJ6D-[CH2CH
(Cfls)O] aoc31(6si (C)+3)
(OCH3)2, polymer ■ (CH30) 2 (CH3) 5iC3HaO[CH
2CH(CH3)O] ao-COCHCH3CH2
NHC3H6(CH3) 2sio [(CH3)
,siOko,.

5i(CH3)2c3HsN)ICHzCHCHsCO
CsH60[CH2CH2 property imparting agent O:l 8(+C+
HsSi (CH3) (CH30) 2 Synthesis Example 8 After dehydrating the polyoxyalkylene polymer used in Synthesis Example 1 whose molecular end is blocked with a vinyl group in the same manner as Synthesis Example 1, this 474g was given the formula H5CH2CH7.
CH2Si (OCH3) 3 Mercap 1-
392 g of group-containing organosilane and N as a catalyst,
Add 10g of N-bisisobutyronitrile and add 100 to 110
After reacting at ℃ for 3 hours and then stripping for 2 hours under the conditions of 100℃ and 10 mmHg, a 7-night body with a viscosity of 1,200 cS at 25℃ was obtained, which is shown by the formula below. (Hereinafter, this will be abbreviated as Polymer ■).

(CH30) 2sic3■ssc:+1I60 [C
H2C)l (CH3)l1l] aoc3)16S
C3H6Si (OCH3) s Synthesis Example 9 After dehydrating the polyoxyalkylene polymer used in Synthesis Example 1 whose molecular end is blocked with a vinyl group in the same manner as Synthesis Example 1, chloroplatinic acid as a catalyst was added to 474 g of the polyoxyalkylene polymer used in Synthesis Example 1. Add 0.5 g of a 0.5% solution of impropatol and warm to 80°C, and add 21.5 g of methyldimethoxysilane.
2g was gradually added dropwise and reacted at 80 to 90°C for 2 hours.
When stripped for 2 hours under the conditions of 100℃ and 10mm), the viscosity at 25℃ was 3.0OOc.
A liquid of S was obtained, and this liquid was represented by the formula % (hereinafter abbreviated as polymer ■).

Examples 1 to 7, Comparative Examples 1 to 2 800 g of polymers I to IX obtained in Synthesis Examples 1 to 9,
Mix 200 g of dioctyl phthalate and 1,000 g of precipitated calcium carbonate on a Miki roll to make a hese compound, and for 200 g of this hese compound, add 5 g of methyltrimethoxysilane, 1 g of dibutyltin dilaurate as a catalyst, and γ-aminopropyl. Triethoxysilane 1 g of trimethoxysilane was added and mixed thoroughly to produce a room temperature curable composition for molding.

Next, this composition was formed into a sheet with a thickness of 2 mm, and
Leave to cure in an atmosphere of 0°C and 60% RH for 7 days,
The physical properties (hardness, tensile strength, elongation) of this material are JIS-
-6301, the results shown in Table 1 were obtained.

Next, from this composition, JIS-
A H-shaped block of A-5758 was prepared, and glass with a thickness of 5 mm was used as the adherend, and the temperature was 23°C and a relative temperature of 5.
5% in an environment for 7 days, and then at 30°C for 7 days to harden. A tensile test was performed on this product to measure its 50% modulus, maximum tensile strength, and maximum elongation. The results shown in Table 1 were obtained.

(Effects of the Invention) The present invention relates to a room-temperature curable composition which is suitable as a building sealant, and as described above, a) the main chain is essentially of the formula % and its Formula (X) a (Y) bsl at the end of the molecular chain
(R6) R'3- (B.b.

A polymer having a group represented by the formula R'4-e
It is composed of an organosilane represented by S iQe or its partial hydrolysis, and 8) a curing catalyst, but this material is cured by moisture in the air at room temperature, and has a low modulus and high elongation. This gives it the advantage of being particularly useful as a sealant for construction.

[Brief explanation of drawings]

FIG. 1 shows a perspective view of an H-shaped block for measuring modulus, tensile strength, and elongation in the tensile test in Examples. Patent applicant: Meikoshi Kaji Kogyo Co., Ltd.

Claims (1)

[Claims] 1.a) The main chain essentially has the formula -O(R^1O)_nCOCR^2CH_2NHZNH
CH_2CR^2CO(OR^1)_nO-[R here
^1 is a divalent hydrocarbon group having 2 to 4 carbon atoms, R^2 is a hydrogen atom or a methyl group, Z is an unsubstituted or substituted divalent hydrocarbon group having 1 to 20 carbon atoms, an ether having 1 to 20 carbon atoms join,
a divalent organic group containing an ester bond or -NH- bond,
Or the formula -R^5R^3R^4SiO(R^2R^3SiO)_
lSiR^4R^3R^5- (where R^3 and R^4 are unsubstituted or substituted monovalent hydrocarbon groups having 1 to 6 carbon atoms, R^
5 is a divalent hydrocarbon group having 1 to 6 carbon atoms or a divalent hydrocarbon group having 1 to 6 carbon atoms containing an -NH- group, l is an integer of 0 to 50); n is 20-200
] and has the formula (X)_a(X)_bSi(R^6)R^7_3_-_ at the end of the molecular chain.
(_a_+_b_) (here R^6 is 2 with 1 to 6 carbon atoms
A valent hydrocarbon group or a divalent group containing a thioether bond having 1 to 6 carbon atoms, R^7 is an unsubstituted or substituted monovalent hydrocarbon group, X is a hydroxyl group, Y is a hydrolyzable group, a, b are 0 ,1,
2 or 3 and 1≦a+b≦3) 100 parts by weight of a polymer having a hydroxyl group or a hydrolyzable group at the end of the molecular chain, b) General formula R^8_4_-_cSiQ_c (where R^
8 is a monovalent hydrocarbon group having 1 to 8 carbon atoms, Q is a hydrolyzable group, c is 1 to 20 parts by weight of an organosilane represented by 3 or 4) or a partial hydrolyzate thereof, c) Curing catalyst 0 5 parts by weight of a room temperature curable composition. 2. A cured product obtained by curing the composition according to claim 1.