Compositions, articles, and motors

Abstract

The present invention provides a composition with improved balance of filling properties, dispersibility, and setting time, as well as articles and motors obtained using the composition with improved balance of filling properties, dispersibility, and setting time. [Solution] A composition comprising a polymerizable monomer (A), an elastomer (B), a polymerization initiator (C), a reducing agent (D), and a metal adhesion imparter (E), wherein the reducing agent (D) comprises a transition metal salt containing one or more transition metal elements selected from the group consisting of Fe, Ni, Co, and Cu, and the metal adhesion imparter (E) comprises a neutralized salt of a phosphate ester and an amine.

Description

Technical Field

[0001] The present invention relates to compositions, articles, and motors.

Background Art

[0002] For example, the demand for in-vehicle motors for driving wheels of electric vehicles, hybrid vehicles, etc. is expanding. An adhesive is used for the purpose of fixing magnets to the motor. The adhesive is used, for example, for bonding a rotor and a magnet, bonding a stator and a magnet of a motor, etc.

[0003] Patent Document 1 aims to provide a radically curable resin composition that has excellent adhesive strength to metal members such as magnets and gives a cured product that has no cracks or peeling even after a thermal cycle test required for in-vehicle members, and contains (A) component: a vinyl polymer having terminal (meth)acrylic groups, (B) component: a radically polymerizable monomer selected from the group consisting of isobornyl (meth)acrylate, dicyclopentanyl (meth)acrylate, adamantyl (meth)acrylate, acryloylmorpholine, dimethylacrylamide, and diethylacrylamide, (C) component: (meth)acrylate or (meth)acrylic acid having a phosphate group, (D) component: a radical initiator, and contains 5 to 140 parts by mass of the (B) component with respect to 100 parts by mass of the (A) component. A radically curable resin composition is described.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention provides a composition with improved balance of filling properties, dispersibility, and setting time, as well as articles and motors obtained using the composition with improved balance of filling properties, dispersibility, and setting time. [Means for solving the problem]

[0006] The inventors diligently conducted research to solve the above problems. As a result, they found that a composition comprising a polymerizable monomer (A), an elastomer (B), a polymerization initiator (C), a reducing agent (D), and a metal adhesion imparter (E), wherein the reducing agent (D) comprises a transition metal salt containing one or more transition metal elements selected from the group consisting of Fe, Ni, Co, and Cu, and the metal adhesion imparter (E) comprises a neutralized salt of a phosphate ester and an amine, can improve the balance of performance in terms of packing, dispersibility, and setting time, and thus completed the present invention.

[0007] According to the present invention, the following compositions, articles, and motors are provided.

[0008] [1] A composition comprising a polymerizable monomer (A), an elastomer (B), a polymerization initiator (C), a reducing agent (D), and a metal adhesion imparting agent (E), The reducing agent (D) comprises a transition metal salt containing one or more transition metal elements selected from the group consisting of Fe, Ni, Co, and Cu. The metal adhesion imparter (E) is a composition comprising a neutralized salt of a phosphate ester and an amine. [2] The composition according to [1], comprising the transition metal salt Fe. [3] The composition according to [1] or [2], wherein the transition metal salt has a heterocyclic skeleton containing a nitrogen atom. [4] The composition according to any one of [1] to [3], wherein the content of the reducing agent (D) in the composition is 1 part by mass or more and 20 parts by mass or less, when the total content of the polymerizable monomer (A) and the elastomer (B) is 100 parts by mass. [5] The composition according to any one of [1] to [4], wherein the amine in the neutralized salt of the phosphate ester and the amine is a primary amine. [6] The composition according to any one of [1] to [5], wherein the phosphate ester in the neutralized salt of the phosphate ester and the amine comprises a structure represented by the following formula (I). CH2=CHR-COO- (I) (In formula (I) above, R represents a hydrogen atom or a methyl group.) [7] The composition according to any one of [1] to [6], wherein the content of the metal adhesion imparter (E) in the composition is 0.1 parts by mass or more and 10 parts by mass or less, when the total content of the polymerizable monomer (A) and the elastomer (B) is 100 parts by mass. [8] The composition according to any one of [1] to [7], wherein the polymerizable monomer (A) comprises a monofunctional (meth)acrylate (A1). [9] The composition according to [8], wherein the monofunctional (meth)acrylate (A1) comprises a tricyclic monofunctional (meth)acrylate in which the three rings are alicyclic.

[10] The composition according to [8] or [9], wherein the content of the monofunctional (meth)acrylate (A1) in the composition is 5 parts by mass or more and 60 parts by mass or less, when the total content of the polymerizable monomer (A) and the elastomer (B) is 100 parts by mass.

[11] The composition according to any one of [1] to

[10] , wherein the polymerizable monomer (A) comprises a highly polar monomer (A2).

[12] The composition according to

[11] , wherein the highly polar monomer (A2) comprises one or more selected from the group consisting of (meth)acrylic acid, fumaric acid, maleic acid, fumaric anhydride, maleic anhydride, monomers having a phosphate group and a (meth)acryloyl group, and hydroxyalkyl (meth)acrylate.

[13] The composition according to

[11] or

[12] , wherein the content of the highly polar monomer (A2) in the composition is 5 parts by mass or more and 50 parts by mass or less, when the total content of the polymerizable monomer (A) and the elastomer (B) is 100 parts by mass.

[14] The composition according to any one of [1] to

[13] , wherein the polymerizable monomer (A) comprises a polyfunctional (meth)acrylate (A3).

[15] The composition according to

[14] , wherein the polyfunctional (meth)acrylate (A3) comprises a tricyclic polyfunctional (meth)acrylate in which the three rings are alicyclic.

[16] The composition according to

[14] or

[15] , wherein the content of the polyfunctional (meth)acrylate (A3) in the composition is 1 part by mass or more and 20 parts by mass or less, when the total content of the polymerizable monomer (A) and the elastomer (B) is 100 parts by mass.

[17] The composition according to any one of [1] to

[16] , wherein the elastomer (B) comprises one or more selected from the group consisting of (meth)acrylonitrile butadiene rubber, methyl (meth)acrylate butadiene styrene rubber, and methyl (meth)acrylate butadiene (meth)acrylonitrile styrene rubber.

[18] The composition according to any one of [1] to

[17] , wherein the content of the elastomer (B) in the composition is 10 parts by mass or more and 70 parts by mass or less, when the total content of the polymerizable monomer (A) and the elastomer (B) is 100 parts by mass.

[19] The composition according to any one of [1] to

[18] , wherein the exothermic peak time determined by the method 1 below is 60 min or less. (Method 1) Of the above compositions, 10 g of the first agent containing the polymerization initiator (C) and 10 g of the second agent containing the reducing agent (D) are placed in a 100 ml disposable cup and mixed well. Then, immediately insert a K-type thermocouple into the composition and measure the temperature change at 10-second intervals. Next, after mixing the composition, measure the time (min) until a heat generation peak is shown, and use this as the heat generation peak time.

[20] The composition according to any one of [1] to

[19] , wherein when the composition is applied to a gap with a thickness of 0.25 mm by the following method 2, the entire surface of the gap is filled with the composition. (Method 2) Prepare two metal plates made of cold-rolled steel sheets with dimensions of 20 mm × 100 mm × 1.6 mm t. Next, stick polytetrafluoroethylene tapes with a thickness of 0.25 mm to both ends of one surface of the metal plate, and create a 20 mm × 20 mm area on the middle part where the polytetrafluoroethylene tape is not stuck. Next, stick the polytetrafluoroethylene tape on the entire surface of the other surface of the metal plate. Then, bond the surfaces of the respective metal plates on which the polytetrafluoroethylene tape is stuck together, fasten with clips, and stick a polyester-based masking tape on the bottom surface to block one side of the gap. Next, apply 0.3 g of the composition to the 20 mm × 20 mm × 0.25 mm t gap formed between the respective metal plates, let it stand for 30 minutes, then remove the clips and check whether the entire surface of the gap is filled with the composition.

[21] The composition according to any one of [1] to

[20] , wherein the viscosity measured using a B-type viscometer under the conditions of a rotation speed of 20 rpm, a measurement time of 2 minutes, and a measurement ambient temperature of 25°C in accordance with JIS K 6833-1:2008 is 10 Pa·s or less.

[22] A two-component composition consisting of a first agent and a second agent, which is mixed and used immediately before use, The composition according to any one of [1] to

[21] , wherein the first agent contains the polymerization initiator (C) and the second agent contains the reducing agent (D).

[23] The composition according to any one of [1] to

[22] , which is an adhesive composition. [twenty four] A composition used in a motor, as described in any of [1] to

[23] . [twenty five] The composition according to

[24] , used for fixing a magnet in a gap present in the rotor constituting the motor.

[26] The motor is a wound-field motor, The composition according to

[24] or

[25] , used for insulating reinforcement of the gaps in the coils of the aforementioned wound-field motor.

[27] The composition described in

[23] , used for interlayer bonding of laminated steel sheets.

[28] An article comprising a cured product comprising any of the compositions described in [1] to

[27] .

[29] A motor comprising a cured product comprising any of the compositions described in [1] to

[27] . [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a composition with improved balance of performance in terms of filling properties, dispersibility, and setting time, as well as articles and motors obtained using the composition with improved balance of performance in terms of filling properties, dispersibility, and setting time. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described in detail below.

[0011] In this specification, the notation "X~Y" in descriptions of numerical ranges means X or greater and Y or less, unless otherwise specified. For example, "1~5 mass%" means "1 mass% or greater and 5 mass% or less." In this specification, when a composition is in a two-part form consisting of a first agent and a second agent, the content of each component is preferably expressed as the content relative to the total of the first and second agents. In this specification, when a group (atomic group) is not specified as substituted or unsubstituted, it includes both unsubstituted and substituted groups. For example, "alkyl group" includes not only unsubstituted alkyl groups but also substituted alkyl groups. In this specification, the term "(meth)acrylic" refers to a concept that encompasses both acrylic and methacrylic. The same applies to similar terms such as "(meth)acrylate." In this specification, unless otherwise specified, the term "organic group" refers to an atomic group obtained by removing one or more hydrogen atoms from an organic compound. For example, "monovalent organic group" refers to an atomic group obtained by removing one hydrogen atom from any organic compound.

[0012] <Composition> The composition of this embodiment comprises a polymerizable monomer (A), an elastomer (B), a polymerization initiator (C), a reducing agent (D), and a metal adhesion imparter (E), wherein the reducing agent (D) comprises a transition metal salt containing one or more transition metal elements selected from the group consisting of Fe, Ni, Co, and Cu, and the metal adhesion imparter (E) comprises a neutralized salt of a phosphate ester and an amine.

[0013] For example, compositions used in motors and the like require improved balance of performance in terms of filling ability, dispersibility, and setting time. The inventors diligently conducted research to achieve the above objectives. As a result, they found that the selection of a reducing agent to be added to the composition is important for improving the balance between packing and dispersibility performance, and that the selection of a metal adhesion imparter to be added to the composition is important for improving the balance between dispersibility and setting time performance.

[0014] Based on the above findings, the inventors conducted further intensive studies and found that by selecting a transition metal salt containing one or more transition metal elements selected from the group consisting of Fe, Ni, Co, and Cu as a reducing agent, and selecting a neutralized salt of a phosphate ester and an amine as a metal adhesion imparter, a composition with an improved balance of packing, dispersibility, and setting time performance can be obtained, as well as articles and motors using the composition with an improved balance of packing, dispersibility, and setting time performance, thus completing the present invention.

[0015] <Reducing agent (D)> The reducing agent (D) of this embodiment includes a transition metal salt containing one or more transition metal elements selected from the group consisting of Fe, Ni, Co, and Cu.

[0016] The transition metal salt in this embodiment preferably contains Fe, from the viewpoint of further improving the balance between packing and dispersibility properties.

[0017] The transition metal salt of this embodiment preferably has a heterocyclic skeleton containing a nitrogen atom, and more preferably has a pyridine skeleton, from the viewpoint of further improving the balance of packing and dispersibility properties.

[0018] The transition metal salt of this embodiment preferably has 1 to 10 pyridine skeletons in the molecule, more preferably 1 to 6 pyridine skeletons in the molecule, and even more preferably 2 to 4 pyridine skeletons in the molecule, from the viewpoint of further improving the balance of packing and dispersibility properties.

[0019] The transition metal salt of this embodiment preferably has 1 to 20 nitrogen atoms in the molecule, more preferably 2 to 15 nitrogen atoms in the molecule, even more preferably 3 to 10 nitrogen atoms in the molecule, and even more preferably 4 to 6 nitrogen atoms in the molecule, from the viewpoint of further improving the balance of packing and dispersibility performance.

[0020] The reducing agent (D) of this embodiment preferably further comprises an organic solvent, more preferably one or more selected from the group consisting of propylene glycol, dipropylene glycol, ethylene glycol, triethylene glycol, dipropylene glycol methyl ether, propylene glycol methyl ether, propylene glycol ethyl ether, and ethylene glycol monobutyl ether, and even more preferably one or more selected from the group consisting of propylene glycol and dipropylene glycol methyl ether.

[0021] The reducing agent (D) of this embodiment preferably further comprises a tertiary amine, more preferably one or more selected from the group consisting of triethylamine, tripropylamine, tributylamine, N,N-dimethylparatoluidine, and N,N-di(β-hydroxyethyl)-p-toluidine, and even more preferably further comprises N,N-di(β-hydroxyethyl)-p-toluidine.

[0022] The content of the transition metal salt in the reducing agent (D) of this embodiment is preferably 0.001 parts by mass or more and 10 parts by mass or less, more preferably 0.01 parts by mass or more and 5 parts by mass or less, and even more preferably 0.1 parts by mass or more and 3 parts by mass or less, when the total amount of the reducing agent (D) is 100 parts by mass.

[0023] From the viewpoint of further improving the balance of performance in packing, dispersibility, and setting time, the content of the reducing agent (D) in the composition of this embodiment is preferably 0.1 parts by mass or more and 20 parts by mass or less, more preferably 0.5 parts by mass or more and 10 parts by mass or less, even more preferably 1 part by mass or more and 7 parts by mass or less, even more preferably 1.5 parts by mass or more and 5 parts by mass or less, and even more preferably 2 parts by mass or more and 4 parts by mass or less, when the total content of polymerizable monomer (A) and elastomer (B) is 100 parts by mass.

[0024] <Metal adhesion enhancer (E)> The metal adhesion imparter (E) of this embodiment contains a neutralized salt of a phosphate ester and an amine.

[0025] In this embodiment, the amine in the neutralization salt of the phosphate ester and the amine preferably contains a primary amine, more preferably an alkanolamine, and even more preferably a monoethanolamine, from the viewpoint of further improving the balance of dispersibility and setting time performance.

[0026] The phosphate ester in the neutralization salt of the phosphate ester and amine in this embodiment preferably contains the structure represented by the following formula (I). CH2=CHR-COO- (I) (In formula (I), R represents a hydrogen atom or a methyl group.)

[0027] The phosphate ester in the neutralization salt of the phosphate ester and amine in this embodiment preferably contains 1 to 6 structures represented by formula (I) in the molecule, more preferably 1 to 3 structures represented by formula (I) in the molecule, and even more preferably 2 structures represented by formula (I) in the molecule.

[0028] In this embodiment, the phosphate ester in the neutralized salt of the phosphate ester and amine preferably contains 1 to 6 phosphate groups in the molecule, more preferably 1 to 3 phosphate groups in the molecule, and even more preferably 1 phosphate group in the molecule.

[0029] From the viewpoint of further improving the balance of performance in filling, dispersibility, and setting time, the content of the metal adhesion imparter (E) in the composition of this embodiment is preferably 0.1 parts by mass or more and 10 parts by mass or less, more preferably 0.3 parts by mass or more and 7 parts by mass or less, and even more preferably 0.5 parts by mass or more and 5 parts by mass or less, when the total content of polymerizable monomer (A) and elastomer (B) is 100 parts by mass.

[0030] <Monofunctional (meth)acrylate (A1)> The polymerizable monomer (A) in this embodiment preferably comprises a monofunctional (meth)acrylate (A1).

[0031] In this embodiment, monofunctional (meth)acrylate (A1) refers to a compound having one (meth)acryloyl group. However, monofunctional (meth)acrylate (A1) in this embodiment excludes those corresponding to the highly polar monomer (A2) described later.

[0032] The monofunctional (meth)acrylate (A1) of this embodiment preferably contains a monomer represented by the following general formula (II). CH2=CHR 1 -COO-R 2 (II) In general formula (I), R 1 R is a hydrogen atom or a methyl group, 2 R is a group containing a cyclic hydrocarbon skeleton, preferably a group containing a polycyclic cyclic hydrocarbon skeleton. 2 The cyclic hydrocarbon skeleton contained therein is preferably an alicyclic skeleton that does not contain an aromatic ring.

[0033] The monofunctional (meth)acrylate (A1) of this embodiment preferably includes a tricyclic monofunctional (meth)acrylate (hereinafter also referred to as "tricyclic monofunctional (meth)acrylate") in which the three rings belong to the alicyclic group. A tricyclic compound refers to a compound with three connected rings. In this embodiment, a tricyclic monofunctional (meth)acrylate refers to a monofunctional (meth)acrylate having an alicyclic hydrocarbon group containing three connected rings. An unsubstituted saturated hydrocarbon group is preferred as the alicyclic hydrocarbon group.

[0034] The tricyclic monofunctional (meth)acrylate of this embodiment preferably comprises one or more selected from the group consisting of monofunctional (meth)acrylates having a structure comprising a dicyclopentane skeleton and a ring connected to the dicyclopentane skeleton, and monofunctional (meth)acrylates having a dicyclopentadiene skeleton. More preferably comprises one or more selected from the group consisting of dicyclopentanyl (meth)acrylate, dicyclopentenyloxyethyl (meth)acrylate, and dicyclopentenyl (meth)acrylate, and even more preferably comprises dicyclopentanyl (meth)acrylate. An example of dicyclopentanyl (meth)acrylate is FA-513M manufactured by Hitachi Chemical Co., Ltd.

[0035] The content of monofunctional (meth)acrylate (A1) in the composition of this embodiment is preferably 5 to 60 parts by mass, more preferably 10 to 50 parts by mass, even more preferably 15 to 45 parts by mass, and even more preferably 18 to 43 parts by mass, when the total content of polymerizable monomer (A) and elastomer (B) is 100 parts by mass.

[0036] The content of the tricyclic monofunctional (meth)acrylate in the monofunctional (meth)acrylate (A1) of this embodiment is preferably 50 parts by mass or more and 100 parts by mass or less, more preferably 70 parts by mass or more and 100 parts by mass or less, even more preferably 90 parts by mass or more and 100 parts by mass or less, and even more preferably 95 parts by mass or more and 100 parts by mass or less, when the total amount of monofunctional (meth)acrylate (A1) is 100 parts by mass.

[0037] <Highly polar monomer (A2)> The polymerizable monomer (A) in this embodiment preferably includes a highly polar monomer (A2). The highly polar monomer (A2) of this embodiment is, for example, a polymerizable monomer having a polar functional group and a carbon-carbon double bond. The highly polar monomer (A2) of this embodiment may be a monofunctional monomer (a monomer having one carbon-carbon double bond) or a polyfunctional monomer (a monomer having multiple carbon-carbon double bonds), but it is preferably a monofunctional monomer.

[0038] The polar functional groups of the highly polar monomer (A2) of this embodiment preferably include one or more selected from the group consisting of carboxyl groups, hydroxyl groups, and phosphate groups, more preferably include one or more selected from the group consisting of carboxyl groups and phosphate groups, and even more preferably include a carboxyl group.

[0039] The highly polar monomer (A2) of this embodiment preferably comprises one or more selected from the group consisting of (meth)acrylic acid, fumaric acid, maleic acid, fumaric anhydride, maleic anhydride, monomers having a phosphoric acid group and a (meth)acryloyl group, and hydroxyalkyl (meth)acrylates, more preferably comprises one or more selected from the group consisting of (meth)acrylic acid and monomers having a phosphoric acid group and a (meth)acryloyl group, even more preferably comprises (meth)acrylic acid, and even more preferably comprises methacrylic acid.

[0040] The content of the highly polar monomer (A2) in the composition of this embodiment is preferably 5 parts by mass or more and 50 parts by mass or less, more preferably 10 parts by mass or more and 40 parts by mass or less, even more preferably 15 parts by mass or more and 30 parts by mass or less, and even more preferably 20 parts by mass or more and 25 parts by mass or less, when the total content of polymerizable monomer (A) and elastomer (B) is 100 parts by mass.

[0041] <Polyfunctional (meth)acrylate (A3)> The polymerizable monomer (A) in this embodiment preferably includes a polyfunctional (meth)acrylate (A3). In this embodiment, the polyfunctional (meth)acrylate (A3) refers to a compound having two or more carbon-carbon double bonds, such as a (meth)acryloyl group. However, the polyfunctional (meth)acrylate (A3) in this embodiment excludes those corresponding to the highly polar monomer (A2) in this embodiment.

[0042] The polyfunctional (meth)acrylate (A3) of this embodiment preferably contains 2 to 6 (meth)acryloyl groups, more preferably 2 to 4 (meth)acryloyl groups, even more preferably 2 to 3 (meth)acryloyl groups, and even more preferably 2 (meth)acryloyl groups.

[0043] The polyfunctional (meth)acrylate (A3) of this embodiment preferably comprises one or more selected from the group consisting of polyfunctional (meth)acrylates having an alicyclic structure, polyfunctional (meth)acrylates having an aromatic ring structure, and polyfunctional (meth)acrylates having an aliphatic branched structure, more preferably comprising polyfunctional (meth)acrylates having an alicyclic structure, and even more preferably comprising tricyclic polyfunctional (meth)acrylates in which the three rings are alicyclic. A tricyclic compound refers to a compound with three connected rings. In this embodiment, a tricyclic polyfunctional (meth)acrylate refers to a polyfunctional (meth)acrylate having an alicyclic hydrocarbon group containing three connected rings. An unsubstituted saturated hydrocarbon group is preferred as the alicyclic hydrocarbon group.

[0044] The tricyclic polyfunctional (meth)acrylate of this embodiment preferably comprises one or more selected from the group consisting of polyfunctional (meth)acrylates having a structure comprising a dicyclopentane skeleton and a ring connected to the dicyclopentane skeleton, and polyfunctional (meth)acrylates having a dicyclopentadiene skeleton, more preferably comprising one or more selected from the group consisting of dicyclopentanyl di(meth)acrylate, dicyclopentenyloxyethyl di(meth)acrylate, and dicyclopentenyl di(meth)acrylate, and even more preferably comprising dicyclopentanyl di(meth)acrylate. An example of dicyclopentanyl di(meth)acrylate is DCP manufactured by Shin Nakamura Chemical Industry Co., Ltd.

[0045] The content of the polyfunctional (meth)acrylate (A3) in the composition of this embodiment is preferably 1 to 20 parts by mass, more preferably 2 to 15 parts by mass, and even more preferably 3 to 10 parts by mass, when the total content of polymerizable monomer (A) and elastomer (B) is 100 parts by mass.

[0046] The content of the tricyclic polyfunctional (meth)acrylate in the polyfunctional (meth)acrylate (A3) of this embodiment is preferably 50 parts by mass or more and 100 parts by mass or less, more preferably 70 parts by mass or more and 100 parts by mass or less, even more preferably 90 parts by mass or more and 100 parts by mass or less, and even more preferably 95 parts by mass or more and 100 parts by mass or less, when the total amount of polyfunctional (meth)acrylate (A3) is 100 parts by mass.

[0047] <Polymerizable monomer (A)> The content of polymerizable monomer (A) in the composition of this embodiment is preferably 30 parts by mass or more and 90 parts by mass or less, more preferably 35 parts by mass or more and 85 parts by mass or less, even more preferably 40 parts by mass or more and 80 parts by mass or less, and even more preferably 45 parts by mass or more and 75 parts by mass or less, when the total content of polymerizable monomer (A) and elastomer (B) is 100 parts by mass.

[0048] <Elastomer (B)> The elastomer (B) of this embodiment preferably has soft segment units. The soft segment units preferably include one or more selected from the group consisting of diene structures, ethylene structures, propylene structures, isoprene structures, urethane structures, ethylene glycol structures, propylene glycol structures, silicone structures, and chloroprene structures, and more preferably include diene structures such as butadiene structures.

[0049] The elastomer (B) of this embodiment may have hard segments in addition to the soft segment unit. The "soft segment" represents a flexible portion that exhibits rubber elasticity. The "hard segment" represents a molecularly constrained portion that acts as a crosslinking point for crosslinked rubber to prevent plastic deformation.

[0050] The elastomer (B) of this embodiment preferably comprises one or more selected from the group consisting of (meth)acrylonitrile butadiene rubber, methyl (meth)acrylate butadiene styrene rubber, and methyl (meth)acrylate butadiene / (meth)acrylonitrile styrene rubber, and more preferably comprises one or more selected from the group consisting of (meth)acrylonitrile butadiene rubber and methyl (meth)acrylate butadiene / (meth)acrylonitrile styrene rubber, and even more preferably comprises (meth)acrylonitrile butadiene rubber.

[0051] From the viewpoint of further improving the balance of performance in terms of filling, dispersibility, and setting time, the content of elastomer (B) in the composition of this embodiment is preferably 10 parts by mass or more and 70 parts by mass or less, more preferably 15 parts by mass or more and 65 parts by mass or less, even more preferably 20 parts by mass or more and 60 parts by mass or less, and even more preferably 25 parts by mass or more and 55 parts by mass or less, when the total content of polymerizable monomer (A) and elastomer (B) is 100 parts by mass.

[0052] <Polymerization initiator (C)> The polymerization initiator (C) of this embodiment preferably comprises a thermal radical polymerization initiator, more preferably one or more selected from the group consisting of cumene hydroperoxide, paramentane hydroperoxide, tert-butyl hydroperoxide, diisopropylbenzene dihydroperoxide, methyl ethyl ketone peroxide, and tert-butyl peroxybenzoate, and even more preferably cumene hydroperoxide.

[0053] From the viewpoint of further improving reactivity, the content of the polymerization initiator (C) in the composition of this embodiment is preferably 0.1 parts by mass or more and 20 parts by mass or less, more preferably 0.5 parts by mass or more and 15 parts by mass or less, even more preferably 1 part by mass or more and 10 parts by mass or less, and even more preferably 2 parts by mass or more and 5 parts by mass or less, when the total content of polymerizable monomer (A) and elastomer (B) is 100 parts by mass.

[0054] <Stabilizer> The composition of this embodiment preferably further includes a stabilizer from the viewpoint of further improving storage stability. The stabilizer of this embodiment preferably comprises one or more selected from the group consisting of a phenolic antioxidant such as 2,2'-methylenebis(4-methyl-6-t-butylphenol); a quinone compound such as p-benzoquinone, methoquinone, or hydroquinone monomethyl ether; an amine polymerization inhibitor such as phenothiazine; and a stable radical compound such as 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl. More preferably, it comprises one or more selected from the group consisting of 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl and methoquinone.

[0055] The amount of stabilizer in the composition of this embodiment is preferably 0.01 parts by mass or more and 10 parts by mass or less, more preferably 0.05 parts by mass or more and 5 parts by mass or less, and even more preferably 0.1 parts by mass or more and 1 part by mass or less, when the total amount of polymerizable monomer (A) and elastomer (B) is 100 parts by mass.

[0056] <Fever peak time> The exothermic peak time of the composition of this embodiment, determined by the following method 1, is preferably 60 min or less, more preferably 50 min or less, even more preferably 40 min or less, even more preferably 30 min or less, and even more preferably 20 min or less, from the viewpoint of shortening the setting time. The lower limit of the exothermic peak time of the composition of this embodiment is not particularly limited, but may be, for example, 1 min or more, 5 min or more, or 10 min or more. (Method 1) Of the composition, 10 g of the first component containing the polymerization initiator (C) and 10 g of the second component containing the reducing agent (D) are placed in a 100 ml disposable cup and thoroughly mixed. Immediately afterward, a K-type thermocouple is inserted into the composition and the temperature change is measured at 10-second intervals. Next, the time (min) from mixing the composition until the exothermic peak is observed is measured and defined as the exothermic peak time.

[0057] From the viewpoint of shortening the setting time, the peak exothermic time obtained by Method 1 of the composition of this embodiment is preferably 1 min to 60 min, more preferably 1 min to 50 min, even more preferably 1 min to 40 min, even more preferably 5 min to 30 min, and even more preferably 10 min to 20 min.

[0058] <Fillability> From the viewpoint of further improving filling performance, the composition of this embodiment preferably fills the entire surface of the gap when applied to a gap with a thickness of 0.25 mm by the method 2 described below. (Method 2) Prepare two metal plates made of cold-rolled steel, measuring 20mm x 100mm x 1.6mm thick. Next, apply 0.25mm thick polytetrafluoroethylene tape to both ends of the surface of one metal plate, creating a 20mm x 20mm area in the middle where the polytetrafluoroethylene tape is not applied. Next, apply polytetrafluoroethylene tape to the entire surface of the other metal plate. Then, stick the surfaces of the metal plates with the polytetrafluoroethylene tape applied together, secure them with clips, and apply polyester masking tape to the bottom to seal the gap on one side. Next, apply 0.3g of the composition to the 20mm x 20mm x 0.25mm thick gap between the metal plates, let it stand for 30 minutes, then remove the clips and check that the composition has filled the entire gap.

[0059] <Viscosity> In accordance with JIS K 6833-1:2008, the viscosity of the composition of this embodiment, measured using a Type B viscometer under the conditions of a rotation speed of 20 rpm, a measurement time of 2 minutes, and a measurement ambient temperature of 25°C, is preferably 10 Pa·s or less, more preferably 8 Pa·s or less, even more preferably 6 Pa·s or less, even more preferably 5 Pa·s or less, even more preferably 4 Pa·s or less, and even more preferably 3 Pa·s or less, from the viewpoint of further improving the balance of performance of packing, dispersibility, and setting time. The lower limit of the viscosity of the composition of this embodiment is not particularly limited, but may be, for example, 0.001 Pa·s or more, 0.01 Pa·s or more, or 0.1 Pa·s or more.

[0060] In accordance with JIS K 6833-1:2008, the viscosity of the composition of this embodiment, measured using a Type B viscometer under the conditions of a rotation speed of 20 rpm, a measurement time of 2 minutes, and a measurement ambient temperature of 25°C, is preferably 0.001 Pa·s to 10 Pa·s, more preferably 0.001 Pa·s to 8 Pa·s, even more preferably 0.001 Pa·s to 6 Pa·s, even more preferably 0.001 Pa·s to 5 Pa·s, even more preferably 0.01 Pa·s to 4 Pa·s, and even more preferably 0.1 Pa·s to 3 Pa·s.

[0061] <Elongation at break> The elongation at break of the composition of this embodiment, as determined by the following method 3, is preferably 10% to 150%, more preferably 15% to 140%, even more preferably 20% to 130%, even more preferably 25% to 120%, even more preferably 30% to 110%, even more preferably 35% to 100%, and even more preferably 40% to 90%, from the viewpoint of further improving the balance of performance of filling, dispersibility, and setting time. (Method 3) The composition is cured for 24 hours at 23°C and 50% relative humidity to prepare a 1BA type dumbbell-shaped test specimen as specified in Annex A of JIS K 7161-2:2014. Then, using a tensile testing machine, a tensile test is performed on the test specimen at a tensile speed of 10 mm / min in an atmosphere of 23°C, in accordance with JIS K7161-1:2014 and JIS K7161-2:2014, and the elongation at break (%) is measured.

[0062] <Glass transition temperature> The glass transition temperature of the composition of this embodiment, as determined by the following method 4, is preferably 150°C to 250°C, more preferably 160°C to 240°C, even more preferably 170°C to 230°C, even more preferably 180°C to 220°C, even more preferably 190°C to 210°C, and even more preferably 192°C to 200°C, from the viewpoint of further improving the balance of performance of packing, dispersibility, and setting time. (Method 4) A 0.5 mm thick silicone sheet with 5 x 40 mm holes is placed on a PET film, and the composition is applied to the areas with holes to form a coating film. Next, another PET film is laminated over the coating film. Then, both sides are sandwiched between 1 cm thick glass plates, and weights are placed on top to compress them. Next, the film is cured for 24 hours in a room at 23°C and 50 RH, after which the compression is released, the PET film is peeled off, and a sheet-like cured material is obtained. Next, the sheet-like cured material is cut to obtain a 0.5 x 5 x 40 mm test piece. Next, the dynamic viscoelastic properties of the test piece are measured using a dynamic viscoelasticity measuring device under the conditions of frequency: 1.0 Hz, mode: tensile mode, measurement temperature range: 0°C to 250°C, and heating rate: 5°C / min, and data is obtained. Next, based on the data, the peak top temperature of the loss tangent (tanδ) (tanδ peak value) is determined from the temperature-loss tangent (tanδ) curve and is defined as the glass transition temperature.

[0063] <Single dosage form / Two dosage forms> The composition of this embodiment may be a single-dose form or a two-dose form (a form in which two agents, filled in separate containers, are mixed immediately before use). The composition of this embodiment, when in a two-part form, preferably consists of a first component and a second component, and is a composition that is mixed immediately before use, wherein the first component contains a polymerization initiator (C) and the second component contains a reducing agent (D).

[0064] If the composition of this embodiment is a two-part type, it is preferable to adjust the amounts of each raw material in the first and second components so that the composition after mixing the first and second components contains each raw material within the preferred content range described above. Furthermore, the various properties of the composition described herein relate to the composition after mixing the first and second components.

[0065] <Method for producing adhesive compositions> In manufacturing the composition of this embodiment, it is preferable not to simply mix the above-mentioned raw materials, but to appropriately adjust the mixing order, mixing method, etc., of each raw material. In the production of the composition of this embodiment, it is particularly preferable that the polymerizable monomer (A) and the elastomer (B) are thoroughly mixed. For this reason, as shown in the examples below, it is preferable to (i) first thoroughly and uniformly mix at least a portion of the polymerizable monomer (A) and at least a portion of the elastomer (B) at 50 to 80°C to form a mixture, and (ii) then add other components to the mixture and stir. It is believed that this ensures that the polymerizable monomer (A) and the elastomer (B) are thoroughly and uniformly mixed. The composition produced in this way tends to satisfy the above-mentioned properties of the composition (viscosity, elongation at break of the cured product, glass transition temperature, etc.) more easily than compositions obtained by other production methods.

[0066] <Application> The composition of this embodiment is an adhesive composition, for example, because it has an improved balance of performance in terms of filling ability, dispersibility, and setting time. The composition of this embodiment is suitably used as an adhesive composition, for example, for interlayer bonding of laminated steel sheets.

[0067] The composition of this embodiment has an improved balance of performance in terms of filling ability, dispersibility, and setting time, and is therefore suitable for use in motors, for example, and more preferably for fixing magnets in the gaps present in the rotor that constitutes the motor.

[0068] When the composition of this embodiment is used in a motor, for example, if the motor is a wound-field motor, it is suitably used to reinforce the insulation of the gaps between the coils of the wound-field motor.

[0069] <Goods> The article of this embodiment includes a cured product comprising the composition of this embodiment. By applying the composition of this embodiment to an article and curing it, an article containing a cured product made of the composition can be obtained. The composition of this embodiment preferably cures without heating (at room temperature) and can bond articles (especially when it contains a polymerization initiator and a reducing agent). Of course, heating during the bonding of articles is not excluded.

[0070] <motor> The motor of this embodiment includes a cured product made from the composition of this embodiment. The motor of this embodiment comprises, for example, a magnet and a rotor, and includes a cured material made from the composition of this embodiment between the magnet and the rotor. In this case, it is preferable that the space between the magnet and the rotor in the motor is fixed by the cured material made from the composition of this embodiment. One method for fixing the magnet to the rotor is to fix the magnet within a slot in the rotor. Examples of such magnets include ferrite magnets and permanent magnets. Examples of permanent magnets include neodymium magnets.

[0071] The motor of this embodiment may be a wound-field motor. In this case, it is preferable that the gaps between the coils of the wound-field motor are insulated and reinforced with a cured product made from the composition of this embodiment.

[0072] Although embodiments of the present invention have been described above, these are merely examples, and various other configurations can be adopted. Furthermore, the present invention is not limited to the embodiments described above, and modifications, improvements, etc., within the scope that can achieve the objectives of the present invention are included in the present invention. [Examples]

[0073] The present invention will be described more specifically below with reference to examples, but the present invention is not limited to these examples.

[0074] <Preparation of composition> The following raw materials were used to prepare the composition. • Monofunctional methacrylate 1:dicyclopentanyl methacrylate (manufactured by Hitachi Chemical Co., Ltd., FA-513M) • High-polarity monomer 1: Methacrylic acid (manufactured by Mitsubishi Gas Chemical Company, AM) • Polyfunctional methacrylate 1: dicyclopentanyl dimethacrylate (manufactured by Shin-Nakamura Chemical Industry Co., Ltd., DCP) • Elastomer 1: Acrylonitrile butadiene rubber (Huntsman Advanced Material, Hypro VTBNX1300LC) • Elastomer 2: Acrylonitrile butadiene rubber (manufactured by JSR, N250SL) • Elastomer 3: Methyl methacrylate-butadiene-styrene copolymer (manufactured by Denka Co., Ltd., BL-20) • Polymerization initiator 1: Cumene hydroperoxide (manufactured by NOF Corporation, PH-80) • Reducing agent 1: Vanadyl acetylacetonate (manufactured by Shinko Chemical Industries, 50D) • Reducing agent 2: Fe-based liquid reducing agent (Borchers, OXY COAT1310) containing 0.25 to 1 part by mass of a transition metal salt represented by the following formula (1), 90 to 100 parts by mass of dipropylene glycol methyl ether, and 1 to 10 parts by mass of propylene glycol. • Reducing agent 3: N,N-di(β-hydroxyethyl)-p-toluidine (manufactured by Morin Chemical Industries, Ltd., PT-2HE) • Metal adhesion enhancer 1: Phosphate ester (Sipomer PAM4000, manufactured by Solvay) • Metal adhesion enhancer 2: Neutralized salt of a phosphate ester represented by the following formula (2) and monoethanolamine (manufactured by Unichemical Co., Ltd., Phosmer MH) • Stabilizer 1: 2,2'-methylenebis(4-ethyl-6-t-butylphenol) (manufactured by Kawaguchi Chemical Industry Co., Ltd., W-500) • Stabilizer 2: p-benzoquinone (manufactured by Seiko Chemical Co., Ltd., PBQ) • Stabilizer 3: 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl (manufactured by Wuxi Qianfeng Chemical Technology, TEMPOL) • Stabilizer 4: Phenothiazine (manufactured by Seiko Chemical Co., Ltd., PSN) • Stabilizer 5: Metoquinone (manufactured by Kawaguchi Chemical Industry Co., Ltd., InM)

[0075] [ka]

[0076] [ka]

[0077] (Examples 1-3 and Comparative Examples 1-3) The first and second components were prepared by thoroughly mixing each raw material in the proportions shown in Table 1 (unit: parts by mass) using a stirring device equipped with stirring blades. Next, the first and second components were mixed in equal amounts to prepare the composition. Note that all units for the proportions of each raw material in Table 1 are parts by mass.

[0078] In the preparation of the first and second components, polymerizable monomer (A) and elastomer (B) were thoroughly and uniformly mixed at 50-80°C to form a mixture, then other raw materials were added to the mixture and stirred, and then the mixture was defoamed to prepare the first and second components, respectively.

[0079] <Measurement and Evaluation> Each of the following measurements and evaluations was performed three times, and the average of the three resulting values ​​was used as the final result.

[0080] <Viscosity> For each example and comparative example, the viscosity (Pa·s) of the first and second components was measured in accordance with JIS K 6833-1:2008 using a Type B viscometer (DV2T, manufactured by Eiko Seiki Co., Ltd.) under the conditions of a rotation speed of 20 rpm, a measurement time of 2 minutes, and a measurement ambient temperature of 25°C. The results are shown in Table 1.

[0081] <Elongation at break> For each example and comparative example, the composition was cured for 24 hours at 23°C and 50% relative humidity to prepare a 1BA type dumbbell-shaped test specimen as specified in Annex A of JIS K 7161-2:2014. Then, using a tensile testing machine (INSTRON3365, manufactured by Instron), a tensile test was performed on the test specimen under conditions of 23°C and a tensile speed of 10 mm / min, in accordance with JIS K7161-1:2014 and JIS K7161-2:2014, and the elongation at break (%) was measured. The results are shown in Table 1.

[0082] <Glass transition temperature> For each example and comparative example, a 0.5 mm thick silicone sheet with 5 × 40 mm holes was placed on a PET film, and the composition was applied to the areas with holes to form a coating film. Next, another PET film was laminated over the coating film. Then, both sides were sandwiched between 1 cm thick glass plates, and weights were placed on top to compress them. Next, the film was cured for 24 hours in a room at a temperature of 23°C and a relative humidity of 50 RH%, after which the compression was released, the PET film was peeled off, and a sheet-like cured material was obtained. Next, the sheet-like cured material was cut to obtain a 0.5 × 5 × 40 mm test piece. Next, the dynamic viscoelastic properties of the test piece were measured using a dynamic viscoelasticity measuring device (Hitachi High-Tech Corporation, DMS7100) under the conditions of frequency: 1.0 Hz, mode: tensile mode, measurement temperature range: 0°C to 250°C, and heating rate: 5°C / min, and data was obtained. Next, based on the data, the peak-top temperature (tanδ peak value) of the loss tangent (tanδ) was determined from the temperature-loss tangent (tanδ) curve and defined as the glass transition temperature (°C). The results are shown in Table 1.

[0083] <Filling performance evaluation> For each example and comparative example, two metal plates made of cold-rolled steel sheet measuring 20 mm × 100 mm × 1.6 mm thick were prepared. Next, 0.25 mm thick polytetrafluoroethylene tape was applied to both ends of the surface of one metal plate, creating a 20 mm × 20 mm area in the middle where the polytetrafluoroethylene tape was not applied. Next, polytetrafluoroethylene tape was applied to the entire surface of the other metal plate. Then, the surfaces of the metal plates with the polytetrafluoroethylene tape applied were joined together and secured with clips, and polyester masking tape was applied to the bottom surface to seal the gap on one side. Next, 0.3 g of the composition was applied to the 20 mm × 20 mm × 0.25 mm thick gap between the metal plates, and after standing for 30 minutes, the clips were removed, and it was confirmed that the composition had filled the entire gap, and the filling performance was evaluated according to the following criteria. The results are shown in Table 1. A: The entire surface of the gap is filled with the composition. B: The entire gap was not filled with the composition.

[0084] <Evaluation of variance> After thoroughly mixing the second agent for each example and comparative example, it was allowed to stand for 10 minutes. The standing second agent was then visually observed, and its dispersibility was evaluated according to the following criteria. Since reducing agent 1 was blue and reducing agent 2 was yellow, poor dispersion and sedimentation of the reducing agents could be visually confirmed. The results are shown in Table 1. A: No dispersion or sedimentation of the reducing agent was observed. B: Poor dispersion and sedimentation of the reducing agent were observed.

[0085] <Fever peak time> For each example and comparative example, 10 g of the first component containing the polymerization initiator and 10 g of the second component containing the reducing agent were placed in a 100 ml disposable cup and thoroughly mixed. Immediately thereafter, a K-type thermocouple was inserted into the composition, and the temperature change was measured at 10-second intervals. Next, the time (min) from mixing the composition until the exothermic peak was observed was measured and defined as the exothermic peak time. The results are shown in Table 1.

[0086] [Table 1]

Claims

1. A composition comprising a polymerizable monomer (A), an elastomer (B), a polymerization initiator (C), a reducing agent (D), and a metal adhesion imparting agent (E), The reducing agent (D) comprises a transition metal salt containing one or more transition metal elements selected from the group consisting of Fe, Ni, Co, and Cu. The metal adhesion imparter (E) is a composition comprising a neutralized salt of a phosphate ester and an amine.

2. The composition according to claim 1, wherein the transition metal salt contains Fe.

3. The composition according to claim 1 or 2, wherein the transition metal salt has a heterocyclic skeleton containing a nitrogen atom.

4. The composition according to claim 1 or 2, wherein the content of the reducing agent (D) in the composition is 1 part by mass or more and 20 parts by mass or less, when the total content of the polymerizable monomer (A) and the elastomer (B) is 100 parts by mass.

5. The composition according to claim 1 or 2, wherein the amine in the neutralized salt of the phosphate ester and the amine comprises a primary amine.

6. The composition according to claim 1 or 2, wherein the phosphate ester in the neutralized salt of the phosphate ester and the amine comprises a structure represented by the following formula (I). CH ２ =CHR-COO- (I) (In formula (I) above, R represents a hydrogen atom or a methyl group.)

7. The composition according to claim 1 or 2, wherein the content of the metal adhesion imparter (E) in the composition is 0.1 parts by mass or more and 10 parts by mass or less, when the total content of the polymerizable monomer (A) and the elastomer (B) is 100 parts by mass.

8. The composition according to claim 1 or 2, wherein the polymerizable monomer (A) comprises a monofunctional (meth)acrylate (A1).

9. The composition according to claim 8, wherein the monofunctional (meth)acrylate (A1) comprises a tricyclic monofunctional (meth)acrylate in which the three rings are alicyclic.

10. The composition according to claim 8, wherein the content of the monofunctional (meth)acrylate (A1) in the composition is 5 parts by mass or more and 60 parts by mass or less, when the total content of the polymerizable monomer (A) and the elastomer (B) is 100 parts by mass.

11. The composition according to claim 1 or 2, wherein the polymerizable monomer (A) comprises a highly polar monomer (A2).

12. The composition according to claim 11, wherein the highly polar monomer (A2) comprises one or more selected from the group consisting of (meth)acrylic acid, fumaric acid, maleic acid, fumaric anhydride, maleic anhydride, monomers having a phosphate group and a (meth)acryloyl group, and hydroxyalkyl (meth)acrylate.

13. The composition according to claim 11, wherein the content of the highly polar monomer (A2) in the composition is 5 parts by mass or more and 50 parts by mass or less, when the total content of the polymerizable monomer (A) and the elastomer (B) is 100 parts by mass.

14. The composition according to claim 1 or 2, wherein the polymerizable monomer (A) comprises a polyfunctional (meth)acrylate (A3).

15. The composition according to claim 14, wherein the polyfunctional (meth)acrylate (A3) comprises a tricyclic polyfunctional (meth)acrylate in which the three rings are alicyclic.

16. The composition according to claim 14, wherein the content of the polyfunctional (meth)acrylate (A3) in the composition is 1 part by mass or more and 20 parts by mass or less, when the total content of the polymerizable monomer (A) and the elastomer (B) is 100 parts by mass.

17. The composition according to claim 1 or 2, wherein the elastomer (B) comprises one or more selected from the group consisting of (meth)acrylonitrile butadiene rubber, methyl (meth)acrylate butadiene styrene rubber, and methyl (meth)acrylate butadiene (meth)acrylonitrile styrene rubber.

18. The composition according to claim 1 or 2, wherein the content of the elastomer (B) in the composition is 10 parts by mass or more and 70 parts by mass or less, when the total content of the polymerizable monomer (A) and the elastomer (B) is 100 parts by mass.

19. The composition according to claim 1 or 2, wherein the exothermic peak time determined by the method 1 below is 60 min or less. (Method 1) Of the above composition, 10 g of the first component containing the polymerization initiator (C) and 10 g of the second component containing the reducing agent (D) are placed in a 100 ml disposable cup and mixed thoroughly. Then, a K-type thermocouple is immediately inserted into the composition and the temperature change is measured at 10-second intervals. Next, the time (min) from when the composition is mixed until the exothermic peak is observed is measured and defined as the exothermic peak time.

20. The composition according to claim 1 or 2, wherein when the composition is applied to a gap with a thickness of 0.25 mm by the method 2 described below, the entire surface of the gap is filled with the composition. (Method 2) Two metal plates made of cold-rolled steel measuring 20 mm x 100 mm x 1.6 mm thick are prepared. Next, 0.25 mm thick polytetrafluoroethylene tape is applied to both ends of the surface of one of the metal plates, creating a 20 mm x 20 mm area in the middle where the polytetrafluoroethylene tape is not applied. Next, the polytetrafluoroethylene tape is applied to the entire surface of the other metal plate. Next, the surfaces of the metal plates with the polytetrafluoroethylene tape applied are joined together and secured with clips, and polyester masking tape is applied to the bottom surface to seal the gap on one side. Next, 0.3 g of the composition is applied to the 20 mm x 20 mm x 0.25 mm thick gap between the metal plates, left to stand for 30 minutes, then the clips are removed and it is confirmed that the composition has filled the entire gap.

21. The composition according to claim 1 or 2, wherein the viscosity measured using a Type B viscometer in accordance with JIS K 6833-1:2008, under the conditions of a rotation speed of 20 rpm, a measurement time of 2 minutes, and a measurement ambient temperature of 25°C, is 10 Pa·s or less.

22. It is a two-part composition consisting of a first agent and a second agent, which are mixed immediately before use. The composition according to claim 1 or 2, wherein the first agent comprises the polymerization initiator (C) and the second agent comprises the reducing agent (D).

23. The composition according to claim 1 or 2, which is an adhesive composition.

24. A composition according to claim 1 or 2, used in a motor.

25. The composition according to claim 24, used for fixing a magnet in a gap present in the rotor constituting the motor.

26. The motor is a wound-field motor, The composition according to claim 24, which is used for insulating reinforcement of the gaps in the coils of the aforementioned wound-field motor.

27. The composition according to claim 23, used for interlayer bonding of laminated steel sheets.

28. An article comprising a cured product made from the composition according to claim 1 or 2.

29. A motor comprising a cured product made from the composition according to claim 1 or 2.

Images