JP3429091B2 - Curable composition containing isobutylene polymer - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to adhesives, adhesives, paints,
The present invention relates to a curable composition containing, as a main component, an isobutylene-based polymer having a functional group at a terminal, which is useful as a coating material, a sealing material, and a sealing material for electric and electronic devices.

[0002]

2. Description of the Related Art Rubber is an essential material as an industrial material, but general rubbers are poor in fluidity and solubility in solvents due to their high molecular weight, and they are not heated for molding and vulcanization.・ Pressurization is required and workability is poor. When a main chain component having a relatively low degree of polymerization and a reactive functional group are combined, it becomes an elastic body which is liquid at room temperature before the reaction and shows a rubber-like state after the reaction.
The workability, which is a drawback of polymer rubber, can be greatly improved. These materials are called liquid rubbers, and their applications have been expanded to adhesives, pressure-sensitive adhesives, paints, coating materials, sealing materials, electrical / electronic sealing materials, and the like.

Particularly, the main chain component is an isobutylene polymer containing 90 mol% or more of isobutylene units as a monomer composition, and the number average molecular weight is 1,000 or more and less than 40,000 so as not to hinder molding or processing. In the case of those controlled to 1, the material can be a characteristic material utilizing the rubber elasticity, electrical insulation, low water vapor permeability, weather resistance, heat resistance and the like peculiar to isobutylene.

The isobutylene polymer having a controlled molecular weight is a bifunctional component such as 1,4-bis (α-chloroisopropyl) benzene proposed by Kennedy or 1,3,5-tris (α). It is known to be produced by the inifer method (US Pat. No. 4,276,394) in which a trifunctional component such as -chloroisopropyl) benzene is used as an initiator and a chain transfer agent, and BCl ₃ is used as a catalyst to cationically polymerize isobutylene. .

On the other hand, as the reactive functional group, various groups having high chemical reactivity have been introduced, and reaction and curing have been attempted by heat, active energy rays, water, a crosslinking agent and the like. Among them, the carbon-carbon unsaturated group is important, and not only can it be used for crosslinking to improve the degree of polymerization or to be used for crosslinking, but it can also be used for functional group conversion by adding other functional group components. it can. We already have carbon-
A carbon unsaturated group is converted to moisture curability by a hydrosilylation reaction (Japanese Patent Publication No. 4-69659), or a cured product is obtained by an addition reaction of a carbon-carbon unsaturated group and a silicon-hydroxyl group (Japanese Patent Laid-Open No. 3-3659). No. 200807).

In the conventional curable compositions containing an isobutylene polymer as a main component, a reactive silicon group having a functionality of two or more has been introduced because of the necessity of causing a crosslinking reaction and curing. At this time, the molecular weight of the isobutylene polymer was mainly changed in order to control the physical properties of the cured product. It is known that an isobutylene-based polymer generally has a higher viscosity than other polymers when they have similar molecular weights.

Further, in order to attain high elongation in the cured product, it is generally necessary to make the isobutylene-based polymer have a high molecular weight, which further increases the viscosity, which may cause a problem in handling. is there.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide a curable composition containing an isobutylene polymer having a reactive silicon group at the terminal as a main component, without changing the structure and molecular weight of the main chain. , And to provide a curable composition capable of controlling the physical properties of the cured product. Further, this is to provide a curable composition using a low molecular weight isobutylene-based polymer, which has a low viscosity before curing and a cured product having a high elongation.

[0009]

The present invention provides an isobutylene-based polymer having a polyfunctional reactive silicon group at a terminal and an isobutylene-based polymer having a monofunctional reactive silicon group at a terminal at any ratio. It has been found that the above object can be achieved by mixing in the above. That is, the present invention provides a curable composition containing the following components (A) and (B) as essential components; the component (A) has the formula (1):

[0010]

[Chemical 5]

{Wherein R ¹ and R ² each have 1 carbon atom
20 alkyl group, an aryl group having 6 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, or R ³ R ⁴ R ⁵ SiO-
A triorganosiloxy group (R ³ , R ⁴ and R
⁵ represent the same or different and represent a monovalent hydrocarbon group having 1 to 20 carbon atoms, X represents a hydroxyl group or a hydrolyzable group,
When two or more Xs are bonded, they may be the same or different, a represents an integer of 0, 1, 2 or 3, b represents an integer of 0, 1 or 2, and n is 0 or 1-18. Represents the integer of
a + nb ≧ 2. } The reactive silicon group represented by
An isobutylene polymer having at least one molecular terminal.

The component (B) has the formula (2):

[0013]

[Chemical 6]

{In the formula, R ¹ and R ² each have 1 carbon atom
20 alkyl group, an aryl group having 6 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, or R ³ R ⁴ R ⁵ SiO-
A triorganosiloxy group (R ³ , R ⁴ and R
⁵ represent the same or different and represent a monovalent hydrocarbon group having 1 to 20 carbon atoms, X represents a hydroxyl group or a hydrolyzable group,
c represents an integer of 0 or 1, d represents an integer of 0 or 1, n represents 0 or an integer of 1 to 18, and c + nd = 1.
Is. } Is an isobutylene-based polymer having at least one reactive silicon group at the molecular end.

In the present invention, in the formulas (1) and (2), the alkyl group having 1 to 20 carbon atoms in R ¹ and R ² may be linear or branched, and examples thereof include methyl group and ethyl group. Group, n-propyl group, isopropyl group,
Examples thereof include an n-butyl group and a sec-butyl group, and a methyl group is preferable.

Regarding equations (1) and (2), R ¹ and R ²
Examples of the aryl group having 6 to 20 carbon atoms include a phenyl group and a naphthyl group, and a phenyl group is preferable. Regarding the formulas (1) and (2), examples of the aralkyl group having 7 to 20 carbon atoms in R ¹ and R ² include a phenyl group in which an aryl group moiety is unsubstituted or substituted with a methyl group, a naphthyl group and the like. Examples of the alkylene group moiety include those having 1 to 5 carbon atoms, and preferably a methylene group.

With respect to equations (1) and (2), R ¹ and R ²
May be any of the above alkyl group, aryl group, aralkyl group or triorganosiloxy group, but is preferably a methyl group. Regarding the formulas (1) and (2), examples of the hydrolyzable group for X include a hydrogen atom, an alkoxy group, an acyloxy group, a ketoximate group, an amino group,
Examples include commonly used groups such as amide group, aminooxy group, mercapto group and alkenyloxy group.
X may be a hydroxyl group or any of the above hydrolyzable groups.

With respect to equation (1), a is 0, 1, 2 or 3
, B is 0, 1 or 2, n is 0 or an integer of 1 to 18, and a + nb ≧ 2. Regarding equation (2),
c is 0 or 1, b is 0 or 1, and n is 0 or 1.
Represents an integer of ˜18, and c + nd = 1.

The reactive silicon group in the present invention means a group having a silicon atom bonded to a hydrolyzable group which can be hydrolyzed by water in the presence or absence of a silanol condensation catalyst. Specific examples of the functional group include a commonly used group such as a hydrogen atom, an alkoxy group, an acyloxy group, a ketoximate group, an amino group, an amido group, an aminooxy group, a mercapto group and an alkenyloxy group. Among these, an alkoxy group is particularly preferable because it has mild hydrolyzability and is easy to handle.

The isobutylene polymer used in the present invention has a group represented by the formula (1) (hereinafter, also referred to as a terminal functional group) at the terminal. The main chain component bonded to the terminal functional group of the isobutylene polymer is preferably 90 mol% or more of isobutylene units as a monomer composition. The isobutylene-based polymer of the present invention preferably has a number average molecular weight of 1,000 to 4 so as not to interfere with molding or processing.
10,000, more preferably 3,000 to 30,000
It is controlled in the range of 0. Such an isobutylene-based polymer can be synthesized by the above-mentioned inifer method.

Examples of the monomer composition component other than the isobutylene unit in the main chain component include unsaturated hydrocarbons copolymerizable with isobutylene, specifically 1-butene, 2-butene and 2-methyl. -1-butene, 3-methyl-1-butene, pentene, 4-methyl-1-pentene,
Hexene, cyclohexene, vinylcyclohexane, styrene, α-methylstyrene, dimethylstyrene, monochlorostyrene, dichlorostyrene, β-pinene, 5-
Aliphatic olefins such as ethylidene norbornene and indene; butadiene, isoprene, cyclopentadiene,
Dienes such as dicyclopentadiene; styrenes such as styrene, α-methylstyrene, p-chlorostyrene, alkenyl ethers such as methyl vinyl ether, ethyl vinyl ether, isobutyl vinyl ether, divinyldimethylsilane, vinyltrimethylsilane, 1,3- Divinyl-1,1,3,3-tetramethyldisiloxane,
Examples thereof include alkenylsilanes such as trivinylsilane, tetravinylsilane, allyltrimethylsilane and diallyldimethylsilane.

In the above cationic polymerization, H ₂ S
O ₄ , acid such as CCl ₃ CO ₂ H, SnCl ₄ , TiC
A Friedel-Crafts catalyst such as l ₄ may be used as an initiator, but it is produced by the following inifer method described in US Pat. No. 4,276,394 from the viewpoint that a polymer having a functional group at the molecular end can be produced. Preferably.

The inifer method is

[0024]

[Chemical 7]

(In the above formula, Y is a halogen atom, R ^{6 to} R
⁹ is a hydrogen atom, a lower alkyl group or a phenyl group, R ¹⁰
Is a divalent hydrocarbon group, and R ^{11 to} R ¹⁴ are 1 having 1 to 20 carbon atoms.
Valent hydrocarbon group, R ¹⁵ and R ¹⁶ are hydrogen atoms and have 1 to 2 carbon atoms
It is not a monovalent hydrocarbon group of 0 or a halogen atom, and the combination of R ¹⁵ and R ¹⁶ is not a halogen atom and a hydrogen atom, n represents 0 or an integer of 1 to 20). A compound having a structure such as

[0026]

[Chemical 8]

It is a cationic polymerization method using a combination of an organic halogen compound capable of generating a stable carbon cation as described above and a Friedel-Crafts acid catalyst as a polymerization co-initiator. The Friedel-Crafts acid catalyst is represented by MX'p (M is a metal atom, X'is a halogen atom, p is an integer of 2 or more), for example, BCl.
₃ , AlCl ₃ , SnCl ₄ , TiCl ₄ , VCl ₅ ,
FeCl ₃ , BF _3, etc. and Et ₂ AlCl, EtAlC
Examples thereof include organic aluminum compounds such as l ₂ (Et is an ethyl group).

As the reaction solvent, those which do not adversely influence the reaction can be appropriately used and, for example, hydrocarbon solvents such as aliphatic hydrocarbons, aromatic hydrocarbons and halogenated hydrocarbons can be used. Among these, halogenated hydrocarbons are preferable, and chlorinated hydrocarbons having a chlorine atom are more preferable. Specific examples of such aliphatic hydrocarbons include pentane, hexane, heptane, octane, cyclohexane and the like, aromatic hydrocarbons such as benzene, toluene and xylene, and specific examples of halogenated hydrocarbons include chloro. Methane, chloroethane, methylene chloride, 1,
Examples thereof include 1-dichloroethane, chloroform and 1,2-dichloroethane. These may be used alone or in a mixture of two or more. Further, these solvents and additives in a small amount of other solvents and electron donors, for example, acetic acid esters such as ethyl acetate, organic compounds having a nitro group such as nitroethane, pyridines such as picoline, amines such as triethylamine, You may use together ammonium salts, such as ammonium chloride.

The polymerization reaction temperature is not particularly limited, but usually +
10--100 degreeC is preferable, More preferably, it is -30-
It is preferable to set the temperature to about -80 ° C.

The method of introducing a reactive silicon group into the terminal of the isobutylene polymer used in the present invention is not particularly limited, but a hydrogenated silicon compound is added to the carbon-carbon double bond introduced into the terminal of the polymer. Is useful for introducing by a hydrosilylation reaction. The method of introducing a carbon-carbon double bond at the end of the isobutylene-based polymer is not particularly limited, but the allylsilane is reacted with the isobutylene-based polymer immediately after the polymerization, or a chloro group is introduced at both ends after isolation and purification. A method of obtaining a polymer having allyl groups at both ends by adding TiCl ₄ to an isobutylene-based polymer having a group and reacting with allyltrimethylsilane (JP-A-63-10).
No. 5005), a method of using non-conjugated dienes as a copolymerization or terminal terminating agent (JP-A-4-288309), and a method of using butadiene (JP-A-4-233).
916), a method using isoprene, which has been recently shown by the present inventors, and a method of dehydrochlorinating from the terminal of an isobutylene polymer by alkali and heat treatment are known.

In the case of the component (A), the silicon hydride compound used in the hydrosilylation reaction has the formula (5):

[0032]

[Chemical 9]

{In the formula, R ¹ and R ² each have 1 carbon atom
20 alkyl group, an aryl group having 6 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, or R ³ R ⁴ R ⁵ SiO-
A triorganosiloxy group (R ³ , R ⁴ and R
⁵ represent the same or different and represent a monovalent hydrocarbon group having 1 to 20 carbon atoms, X represents a hydroxyl group or a hydrolyzable group,
When two or more Xs are bonded, they may be the same or different, a represents an integer of 0, 1, 2 or 3, b represents an integer of 0, 1 or 2, and n is 0 or 1-18. Represents the integer of
a + nb ≧ 2. } Is represented.

Specific examples of the silicon hydride compound represented by the formula (5) include chlorosilanes such as trichlorosilane, methyldichlorosilane and trimethylsiloxydichlorosilane; trimethoxysilane, triethoxysilane, methyldimethoxysilane, Phenyldimethoxysilane, 1,3,3,5,5,7,7-heptamethyl-
Alkoxysilanes such as 1,1-dimethoxytetrasiloxane; Acyloxysilanes such as methyldiacetoxysilane; Bis (dimethylketoximate) methylsilane, bis (cyclohexylketoximate) methylsilane, bis (diethylketoxymate) trimethyl Ketoxymate silanes such as siloxysilane; 1,3,5-
Si in the molecule of trimethylcyclotrisiloxane, 1,3,5,7-tetramethylcyclotetrasiloxane, etc.
Examples thereof include hydrosilanes having 3 or more —H bonds; alkenyloxysilanes such as methyldi (isopropenyloxy) silane.

In the case of the component (B), the silicon hydride compound used in the hydrosilylation reaction has the formula (6):

[0036]

[Chemical 10]

{In the formula, R ¹ and R ² each have 1 carbon atom
20 alkyl group, an aryl group having 6 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, or R ³ R ⁴ R ⁵ SiO-
A triorganosiloxy group (R ³ , R ⁴ and R
⁵ represent the same or different and represent a monovalent hydrocarbon group having 1 to 20 carbon atoms, X represents a hydroxyl group or a hydrolyzable group,
c represents an integer of 0 or 1, d represents an integer of 0 or 1, n represents 0 or an integer of 1 to 18, and c + nd = 1.
Is. } Is represented.

Specific examples of the silicon hydride compound represented by the formula (5) include chlorosilanes such as dimethylchlorosilane; alkoxysilanes such as dimethylmethoxysilane; and acyloxysilanes such as trimethylsiloxymethylacetoxysilane. Ketoxime silanes such as (dimethylketoximate) dimethylsilane, (cyclohexylketoximate) dimethylsilane, (diethylketoxymate) bis (trimethylsiloxy) silane; dimethylsilane, trimethylsiloxymethylsilane, 1,1 , 3,3-tetramethyldisiloxane, etc., and hydrosilanes having two Si—H bonds in the molecule; alkenyloxysilanes such as dimethylisopropenyloxysilane.

As the hydrosilylation catalyst, a platinum catalyst,
Rhodium catalysts (eg RhCl (PPh ₃ ) ₃ , RhA
l ₂ O ₃ ), ruthenium catalyst (eg RuCl ₃ ),
Iridium catalyst (eg IrCl ₃ ), iron catalyst (eg FeCl ₃ ), aluminum catalyst (eg AlC)
l ₃ ), a palladium catalyst (eg PdCl ₂ .2H ₂
O), nickel catalyst (for example, NiCl ₂ ), titanium catalyst (for example, TiCl ₄ ), and the like, but a platinum catalyst is preferable.

The platinum catalysts useful in the present invention are selected from platinum metal, platinum compounds and platinum complexes on supports. Platinum compounds and platinum complexes include chloroplatinic acid, chloroplatinic acid hexahydrate, complexes of chloroplatinic acid with alcohols, aldehydes, ketones, and platinum-olefin complexes (for example, Pt (CH ₂ ═CH ₂ ) _{3
(PPh 3) 2, Pt (} CH 2 = CH 2) 2 Cl 2),
Platinum-vinyl siloxane complex (for example, Ptn (ViM
e ₂ SiOSiMe ₂ Vi) _m , Pt [(MeViSi
O) ₄ ] _m ), platinum-phosphine complex (for example, Pt
(PPh _{3) 4,} Pt (PBu) _4), platinum - phosphite complex (e.g., Pt [P (OPh) _{3] 4)} (in the formula, Me represents a methyl group, Bu is butyl group, Vi represents a vinyl group, Ph represents a phenyl group, m and n represent integers), dicarbonyldichloroplatinum and the like. Also, Ashby US Pat. Nos. 3,159,601 and 3,159,66.
Platinum-Hydrocarbon Composites as described in US Pat.
Mention may also be made of the platinum alcoholate catalysts described in 220,972. In addition, modic
The platinum chloride-olefin composites described in U.S. Pat. No. 3,516,946 to Dic) are also useful in the present invention. Platinum metal is deposited on a carrier such as charcoal, alumina, zirconia and the like. Also useful in the present invention are platinum-containing materials that allow the reaction between the silicon hydride and the unsaturated portion of the unsaturated compound. The amount of catalyst is not particularly limited, but it is 1 × 10 ⁻¹ for 1 mol of carbon-carbon double bond.
It is preferably used in the range of 1 × 10 ⁻⁸ mol. Further, 1 × 10 ^{−3 to} 1 × 10 ⁻⁵ mol is preferable.

The hydrosilylation reaction is generally 0 to 150.
The reaction is carried out in the temperature range of ℃, but is preferably carried out at 50 to 90 ℃ in order to carry out the reaction at an appropriate reaction rate. For the reaction, n-pentane, n-hexane, n-heptane,
Solvents such as benzene, toluene, xylene or plasticizers such as process oils may be used.

The apparatus for carrying out the hydrosilylation reaction is not particularly limited, but in the case of carrying out the reaction at the boiling point of the silicon hydride compound and the solvent or higher, a pressure vessel such as an autoclave is preferable. However, an azobutylene-based polymer having a chlorosilyl group obtained by a hydrosilylation reaction using chlorosilanes may generate hydrogen chloride gas or hydrochloric acid when condensation-cured, which may cause practical inconvenience. In addition, the generated chlorine ion serves as a catalyst for the condensation reaction of the reactive silicon group, and may adversely affect the storage stability of the polymer having the group. Therefore,
It is preferable to convert the chlorine atom of the chlorosilyl group into an alkoxy group, an acyloxy group, an aminooxy group, an alkenyloxy group, a hydroxyl group or the like before use. Of these, the alkoxy group is particularly preferable because it has mild hydrolyzability and is easy to handle. A method for converting a chlorosilyl group into an alkoxysilyl group is N
by ol Chemistry and Technology
There are various methods as described in gy of Silicone (1968), but as an example, a method using only an alcohol, a method using an alcohol and a base for trapping hydrogen chloride generated, an ortho acid ester such as methyl orthoformate, etc. And a method using an alkali metal alkoxide such as sodium methylate.

The isobutylene type polymers which are both components (A) and (B) in the present invention are represented by formulas (1) and (2), respectively.
It has at least one reactive silicon terminal, but the total number of these groups is usually 1 to 10, and preferably 1.5 to 3 per molecule. The structures of both components (A) and (B) in the present invention can be identified by the following method. For the number average molecular weight, use an RI detector,
It can be determined by GPC measurement (standard polystyrene conversion). In addition, the quantification of terminal functional groups has a high resolution of ¹ H-N.
This can be done by MR spectroscopy. The proton on the carbon directly bonded to the terminal silicon is -0.5 to 1.0 p
It is observed near pm. The main chain peak is generally from 0.6 to
Observed around 2.4 ppm. The terminal functional group density is obtained from the integrated intensity ratio. In the present invention, G
The number of functional groups per molecule is determined from the number average molecular weight determined by PC and the terminal functional group density determined by ¹ H-NMR. In order to make the isobutylene-based polymer of the present invention as it is or to transform it into a rubber-like elastic body, the average number of functional groups per molecule is preferably 1.5 or more.

In the present invention, the mixing ratio of both components (A) and (B) is not particularly limited, but if the component (A) is increased, the physical properties of the cured product will be high modulus and low elongation, and the component (B) will be increased. And low modulus and high elongation. If the component (A) is reduced too much, crosslinking will be insufficient and the gel fraction will decrease, so 5% or more is preferred. The isobutylene-based polymer which is the main component of the curable composition of the present invention does not contain an unsaturated group other than an aromatic ring in the main chain at all or substantially, and therefore, an oxypropylene-based polymer, or other It has significantly better weather resistance and heat resistance than a cured product of an organic polymer having an unsaturated bond.

Further, since the isobutylene polymer, which is the main component of the curable composition of the present invention, is a hydrocarbon polymer, it has good water resistance and the cured product thereof has a significantly low water vapor permeability. In the curable composition of the present invention, various silane compounds may be used as a physical property adjusting agent in order to widely control physical properties such as strength and elongation of the cured product. Specific examples of such compounds include, for example,

[0046]

[Chemical 11]

[0047]

[Chemical 12]

[0048]

[Chemical 13]

[0049]

[Chemical 14]

A hydrolyzable group such as or silanol group
Examples thereof include silicon compounds containing one or more, but are not limited to these. In addition, V in a formula is a hydrogen atom or a C1-C20 hydrocarbon group. There are roughly three methods for adding these silicon compounds. The first method is to simply add the compound to the isobutylene polymer. Depending on the properties of the compound and the like, if necessary, it may be heated and stirred to be uniformly dispersed and dissolved. In this case, it is not necessary to make it completely uniform and transparent, and even if it is in an opaque state, the object can be sufficiently achieved if it is dispersed. If necessary, a dispersibility improver,
For example, a surfactant may be used in combination.

The second method is to add a predetermined amount of the compound when the product is finally used. For example, when used as a two-component type sealing material, the compound may be mixed as a third component in addition to the base and the curing agent. In the third method, the compound is reacted with the isobutylene polymer in advance, and a tin catalyst, a titanate ester catalyst, an acid or a basic catalyst may be used in combination, if necessary. In the case of a compound that produces a compound containing a silanol group due to water, the object can be achieved by adding a necessary amount of water and heating and devolatilizing under reduced pressure.

Specific examples of the catalyst that can be used in this case include:
For example, titanic acid esters such as tetrabutyl titanate and tetrapropyl titanate; tin carboxylates such as dibutyltin dilaurate, dibutyltin maleate, dibutyltin diacetate, tin octylate, tin naphthenate; lead octylate; butylamine, octylamine, dibutylamine. , Monoethanolamine, diethanolamine, triethanolamine, diethylenetriamine, triethylenetetramine, oleylamine, cyclohexylamine, benzylamine, diethylaminopropylamine, xylylenediamine, triethylenediamine, guanidine, diphenylguanidine, 2,4,4
Amine compounds such as 6-tris (dimethylaminomethyl) phenol, morpholine, N-methylmorpholine, 1,3-diazabicyclo (5,4,6) undecene-7 (DBU), or salts thereof with carboxylic acids; Low molecular weight polyamide resin obtained from excess polyamine and polychloric acid; reaction product of excess polyamine and epoxy compound; silane coupling agent having amino group, for example, γ-aminopropyltrimethoxysilane, N- (β
Examples thereof include silanol condensation catalysts such as -aminoethyl) aminopropylmethyldimethoxysilane. These catalysts may be used alone or in combination of two or more.

In the curable composition of the present invention, in addition to the isobutylene-based polymer having a reactive silicon group which is an active ingredient, various silane compounds as the above-mentioned physical property adjusting agent can be used if necessary. Of course, various fillers, plasticizers, silanol condensation catalysts, water, antioxidants, UV absorbers and lubricants that are usually used to cure the isobutylene-based polymer component having a reactive silicon group as an active ingredient. , Pigments, foaming agents, adhesives and the like may be added as necessary.

Examples of the filler used in the present invention include wood flour, pulp, cotton chips, asbestos, glass fiber,
Carbon fiber, mica, walnut shell powder, chaff powder, graphite, diatomaceous earth, clay, fume silica, precipitated silica, silicic acid anhydride, carbon black, calcium carbonate,
Examples thereof include clay, talc, titanium oxide, magnesium carbonate, quartz, fine aluminum powder, flint powder and zinc dust. These fillers may be used alone,
You may use 2 or more types together.

Examples of the plasticizer include polybutene, hydrogenated polybutene, α-methylstyrene oligomer, biphenyl, triphenyl, triaryldimethane, alkylenetriphenyl, liquid polybutadiene, hydrogenated liquid polybutadiene, alkyldiphenyl, and partially hydrogenated terphenyl. Hydrocarbon compounds such as; Chlorinated paraffins;
Dibutyl phthalate, diheptyl phthalate, di (2-
Phthalates such as ethylhexyl) phthalate, butylbenzyl phthalate, butylphthalyl butyl glycolate; non-aromatic dibasic acid esters such as dioctyl adipate and dioctyl sebacate; polyalkylenes such as diethylene glycol benzoate and triethylene glycol dibenzoate Ester of glycol; phosphoric acid ester such as tricresyl phosphate, tributyl phosphate and the like. These may be used alone or in combination of two or more. These plasticizers may be used in place of the solvent for the purpose of adjusting the reaction temperature and adjusting the viscosity of the reaction system when introducing the reactive silicon group into the isobutylene polymer.

In order to cure the isobutylene polymer component having a reactive silicon group, which is the active ingredient of the curable composition of the present invention, a silanol condensation catalyst may be used if necessary. Examples of such condensation catalysts include titanic acid esters such as tetrabutyl titanate and tetrapropyl titanate; tin carboxylic acid salts such as dibutyltin dilaurate, dibutyltin maleate, dibutyltin diacetate, tin octylate, tin naphthenate; dibutyltin oxide and Reaction products with phthalates; Organic aluminum compounds such as dibutyltin diacetylacetonate, aluminum trisacetylacetonate, aluminum trisethylacetoacetate, diisopropoxyaluminum ethylacetoacetate; Zirconium tetraacetylacetonate, titanium tetraacetylacetonate Chelate compounds such as; lead octylate; butylamine, monoethanolamine, triethylenetetramine, guar Jin, 2-ethyl-4-methylimidazole, 1,3-diazabicyclo (5,4,
6) Salts such as undecene-7 (DBU); and other known silanol catalysts such as acidic catalysts and basic catalysts.

Water or a hydrate of an inorganic compound may be used as the moisture source in order to accelerate the hardening or to develop the deep hardening.

The curable composition of the present invention may be used in combination with various adhesiveness-imparting agents for the purpose of further improving the adhesiveness.
Specifically, various silane coupling agents such as epoxy resins, phenol resins, aminosilane compounds, epoxysilane compounds, etc., alkyl titanates, aromatic polyisocyanates, etc. are used by one kind or two or more kinds, so that various kinds of coatings can be obtained. It is possible to improve the adhesiveness to the body.

The heat resistance of the curable composition of the present invention can be improved by blending it with a thermoplastic resin such as hot melt butyl in an amount of 10 to 50 parts by weight. The curable composition of the present invention thus obtained is suitably used as an adhesive or a pressure-sensitive adhesive, a paint, a sealing material composition, a waterproof material, a spraying material, a molding material, a cast rubber material, and the like. sell.

[0060]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

Production Example 1: A 3 L pressure-resistant container equipped with a mechanical stirrer was thoroughly dried and replaced with nitrogen, and then 700 m of methylene chloride dehydrated in advance with molecular sieves 3A.
L, n-hexane 1160 mL, 1,4-bis (α-chloroisopropyl) benzene (hereinafter abbreviated as p-DCC)
22.06 g and 2-methylpyridine 0.94 g were charged. The container was cooled to −70 ° C., and 570 mL of isobutylene monomer weighed in another container was transferred here. Polymerization was started by adding 13.8 mL of titanium tetrachloride using a dried syringe while flowing nitrogen gas little by little through a three-way cock. After continuing stirring for 40 minutes as it was, 43.66 g of allyltrimethylsilane was added.
Stirring was continued for another 105 minutes to complete the reaction. The reaction solution was poured into 5 L of cold methanol and stirred well to reprecipitate the polymer. The precipitate was dissolved in 500 mL of n-hexane and washed twice with 500 mL of ion-exchanged water to remove ionic impurities. The volatile matter was distilled off at a temperature of 120 ° C. for 1 hour to obtain an isobutylene-based polymer having allyl groups at both ends. Hereinafter, the polymer obtained in this production example will be referred to as isobutylene polymer 1.

The analytical values obtained by GPC and elemental analysis were as follows. Number average molecular weight (Mn): 4420 Da Molecular weight distribution (Mw / Mn): 1.55 Number of allyl groups per molecule: 2.14

Production Example 2: 192 mL of methylene chloride, n-
Hexane 348 mL, p-DCC 3.35 g, 2-methylpyridine 0.54 g, isobutylene monomer 168 m
L, titanium tetrachloride 8.0 mL, and allyltrimethylsilane 9.92 g were used as raw materials, and the same operation as in Production Example 1 was performed to obtain an isobutylene-based polymer. Hereinafter, the polymer obtained in this Production Example will be referred to as isobutylene polymer 2.

The analytical values were as follows. Number average molecular weight (Mn): 9380 Da Molecular weight distribution (Mw / Mn): 1.47 Number of allyl groups per molecule: 2.22 Production example 3: Methylene chloride 384 mL, n-hexane 69
6 mL, p-DCC 3.53 g, 2-methylpyridine 0.57 g, isobutylene monomer 337 mL, titanium tetrachloride 8.4 mL, allyltrimethylsilane 8.71 g
Using the above as a raw material, the same operation as in Production Example 1 was performed to obtain an isobutylene-based polymer. Hereinafter, the polymer obtained in this Production Example will be referred to as an isobutylene polymer 3.

The analytical values were as follows. Number average molecular weight (Mn): 16880 Da Molecular weight distribution (Mw / Mn): 1.18 Number of allyl groups per molecule: 2.02

Production Example 4: 153.4 g of isobutylene polymer 1 and 153.4 m of n-heptane were placed in a sufficiently dried 500 mL flask equipped with a mechanical stirrer.
L was added, dissolved, and placed under nitrogen. 9.77 g of dimethoxymethylsilane, Pt [{(CH ₂ ═CH) Me ₂ S
i} ₂ O] ₂ catalyst solution (1.5 × 10 ^-2 mmol) was added,
Stirred at 70 ° C. After 6 hours, the disappearance of the carbon-carbon double bond was confirmed, and the reaction was terminated. Concentrated under reduced pressure at 50 ° C,
An isobutylene polymer having a terminal bifunctional silyl group was obtained. Hereinafter, the polymer obtained in this Production Example will be referred to as isobutylene polymer 4.

Production Example 5: 150.0 g of isobutylene polymer 1 and 150.0 m of n-hexane were placed in a sufficiently dried 500 mL flask equipped with a mechanical stirrer.
L was added, dissolved, and placed under nitrogen. Dimethylchlorosilane 8.51 g, Pt [{(CH ₂ = CH) Me ₂ Si}
₂ O] ₂ catalyst solution (1.5 × 10 ^-2 mmol) was added, and 40
Stir at ℃. After 2 hours, the disappearance of the carbon-carbon double bond was confirmed, and the reaction was terminated. Excess dimethylchlorosilane was distilled off under reduced pressure. Methanol (12.2 mL) and methyl orthoformate (32.8 mL) were added, and the mixture was stirred at 50 ° C. for 4 hours. After concentration at 60 ° C. under reduced pressure, an isobutylene-based polymer having a monofunctional silyl group at its end was obtained. Hereinafter, the polymer obtained in this Production Example will be referred to as isobutylene polymer 5.

Production Example 6: Instead of the isobutylene-based polymer 1, 100.0 g of the isobutylene-based polymer 2, the amount of n-heptane of 100 mL, and the amount of dimethoxymethylsilane of 3.
02G, Pt _{[{(CH 2 = CH) Me} 2 Si} 2 O ]
_{2 The} reaction was performed in the same manner as in Production Example 4 except that the amount of the catalyst solution was 1.2 × 10 ⁻² mmol. Hereinafter, the polymer obtained in this Production Example will be referred to as an isobutylene polymer 6.

Production Example 7: Instead of the isobutylene polymer 1, 180.0 g of isobutylene polymer 2, 180.0 g of n-hexane and 2 of dimethylchlorosilane were used.
0.5 g, Pt [{(CH ₂ = CH) Me ₂ Si}
₂ O] ₂ catalyst solution amount 4.3 × 10 ⁻² mmol, methanol amount 2.63 mL, methyl orthoformate amount 7.10
The reaction was performed in the same manner as in Production Example 5 except that the amount was changed to mL. Hereinafter, the polymer obtained in this Production Example will be referred to as an isobutylene polymer 7.

Production Example 8: In place of the isobutylene polymer 1, 100.0 g of the isobutylene polymer 3, the amount of n-heptane of 100 mL, and the amount of dimethoxymethylsilane of 1.
53 g, Pt [{(CH ₂ = CH) Me ₂ Si} ₂ O]
_{2 The} reaction was performed in the same manner as in Production Example 4 except that the amount of the catalyst solution was 1.2 × 10 ⁻² mmol. Hereinafter, the polymer obtained in this Production Example will be referred to as an isobutylene polymer 8.

Example 1: 70 parts of isobutylene polymer 4 as component (A), 30 parts of isobutylene polymer 5 as component (B), 1 part of water, 25 parts of hexane, separately prepared octyl 3 parts tin acid, 0.7 lauryl amine
5 parts of silanol condensation catalyst was added and kneaded thoroughly. The composition was poured into a mold having a thickness of about 2 mm and defoamed in a vacuum dryer at room temperature for 1 hour. Then, it was cured at room temperature for 4 days and further at 50 ° C. for 4 days to obtain a cured product. A No. 3 dumbbell according to JIS K6301 was punched out from the cured product sheet and subjected to a tensile test at a pulling speed of 200 mm / min.

Examples 2 to 6: The amount of the isobutylene polymer 4 was 50 parts, 33.4 parts, 25 parts, 20 parts and 12.5 parts, and the amount of the isobutylene polymer 5 was 50 parts, 66. 6
Parts, 75 parts, 80 parts, and 87.5 parts, except that cured products were prepared in the same manner as in Example 1 and physical properties were measured.

Reference Example 1: A cured product was prepared in the same manner as in Example 1 except that the amount of the isobutylene polymer 4 was 100 parts and the amount of the isobutylene polymer 5 was 0 part, and the physical properties were measured. The analysis results obtained in Examples 1 to 6 and Reference Example 1 are shown in Table 1 and FIG.

[0074]

[Table 1]

In the table, M30, M50 and M100 are
Stress at 30%, 50% and 100% elongation respectively, TB stands for breaking strength and EB stands for elongation at break. Further, in FIG. 1, P2 represents the component (part) of (A), and P1 represents the component (part) of (B).

Example 7: Same as Example 1 except that 90 parts of isobutylene polymer 6 was used instead of isobutylene polymer 4 and 10 parts of isobutylene polymer 7 was used instead of isobutylene polymer 5. A cured product was prepared and the physical properties were measured. Examples 8-11: The amount of isobutylene-based polymer 6 was 70
Parts, 50 parts, 33.4 parts, 20 parts, and the amount of the isobutylene-based polymer 7 was 30, 50 parts, 66.6 parts, 80 parts, and a cured product was prepared in the same manner as in Example 7. The physical properties were measured.

Reference Example 2: A cured product was prepared in the same manner as in Example 6 except that the amount of the isobutylene polymer 6 was 100 parts and the amount of the isobutylene polymer 7 was 0 part, and the physical properties were measured. The analysis results obtained in Examples 8 to 11 and Reference Example 2 are shown in Table 2 and FIG. The symbols in the tables and figures have the same meanings as the symbols in Table 1 and FIG.

[0078]

[Table 2]

Reference Example 3: Isobutylene type polymers 4 and 5
A cured product was prepared in the same manner as in Example 1 except that 100 parts of the isobutylene polymer 8 was used instead of, and the physical properties were measured.
Table 3 shows the obtained analysis results. The meanings of the symbols in the table are the same as the meanings of the symbols in Table 1.

[0080]

[Table 3]

[0081]

EFFECTS OF THE INVENTION The present invention provides a curable composition containing an isobutylene polymer having a reactive silicon group at the terminal as a main component, and an isobutylene polymer having a polyfunctional reactive silicon group at the terminal. By mixing the polymer and an isobutylene-based polymer having a monofunctional reactive silicon group at the terminal at an arbitrary ratio, without changing the structure and molecular weight of the chain,
The physical properties of the cured product can be controlled.

As a result, even when the main chain has a low molecular weight, the elongation can be increased, and the problem of high viscosity, which is often a problem in isobutylene polymers, can be solved.
The isobutylene polymer of the present invention can be made into a rubber-like elastic body by using a carbon-carbon unsaturated group for polymerization or adding other functional group components. Adhesives, adhesives, paints, coating materials, sealing materials, electrical and electronic sealing materials, vibration control materials,
It is useful as a medical elastic material.

[Brief description of drawings]

FIG. 1 is a diagram showing a relationship between a ratio of a component (A) to a component (B) and EB (%) in Examples 1 to 6 and Reference Example 1 of the present invention.

FIG. 2 is a diagram showing the relationship between the ratio of component (A) to component (B) and EB (%) in Examples 7 to 11 and Reference Example 2 of the present invention.

Claims (8)

(57) [Claims] 1. A curable composition containing the following components (A) and (B) as essential components; the component (A) has the formula (1): {In the formula, R ¹ and R ² are each an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, and 7 to 20 carbon atoms.
Or a triorganosiloxy group represented by R ³ R ⁴ R ⁵ SiO— (R ³ , R ⁴ and R ⁵ are the same or different and represent a monovalent hydrocarbon group having 1 to 20 carbon atoms). , X represents a hydroxyl group or a hydrolyzable group, and when two or more X are bonded, they may be the same or different, and a is 0,
Represents an integer of 1, 2, or 3, b represents an integer of 0, 1 or 2, n represents an integer of 0 or 1 to 18, a + nb ≧ 2
Is. } The isobutylene-type polymer which has the reactive silicon group represented by these at least 1 molecule terminal. Ingredient (B)
Is the formula (2): {In the formula, R ¹ and R ² are each an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, and 7 to 20 carbon atoms.
Or a triorganosiloxy group represented by R ³ R ⁴ R ⁵ SiO— (R ³ , R ⁴ and R ⁵ are the same or different and represent a monovalent hydrocarbon group having 1 to 20 carbon atoms). , X represents a hydroxyl group or a hydrolyzable group, c represents an integer of 0 or 1, d represents an integer of 0 or 1, and n represents 0.
Alternatively, it represents an integer of 1 to 18, and c + nd = 1. } The isobutylene-type polymer which has the reactive silicon group represented by these at least 1 molecule terminal. 2. X in the formulas (1) and (2) is a hydrogen atom, a hydroxyl group, an alkoxy group, an acyloxy group, a ketoximate group, an amino group, an amide group, an aminooxy group, a mercapto group or an alkenyloxy group. , X is 2 or more, they may be the same or different, and the curable composition according to claim 1. 3. The curable composition according to claim 1, wherein X in the formulas (1) and (2) is an alkoxy group. 4. The component (B) has the formula (3): (In the formula, R ² is an alkyl group having 1 to 20 carbon atoms and 6 carbon atoms.
To an aryl group having 20 to 20 carbon atoms or an aralkyl group having 7 to 20 carbon atoms, and X is an alkoxy group. The curable composition according to claim 1, which is an isobutylene-based polymer having at least one reactive silicon group at the molecular end. 5. The curable composition according to claim 4, wherein R ² in the formula (3) is a methyl group and X is a methoxy group. 6. The component (A) has the formula (4): (In the formula, R ² is an alkyl group having 1 to 20 carbon atoms and 6 carbon atoms.
Represents an aryl group having 20 to 20 carbon atoms or an aralkyl group having 7 to 20 carbon atoms, X represents an alkoxy group, and a represents an integer of 2 or 3. 6. The curable composition according to claim 1, wherein the curable composition is an isobutylene-based polymer having at least one reactive silicon group at the molecular end. 7. The curable composition according to claim 6, wherein R ² in the formula (4) is a methyl group and X is a methoxy group. 8. The number average molecular weight of the component (A) and the component (B) is 1,000 to 40,000, and the monomer composition ratio is 90.
8. 1 to 7 containing mol% or more of isobutylene units.
The curable composition according to any one of 1.