JP7458861B2 - Composition for transmission belt and its use Transmission belt - Google Patents

Description

The present invention relates to a composition for power transmission belts and its uses.

Transmission belts are used, for example, as friction transmission belts such as V-belts and V-ribbed belts such as wrapped belts and low-edge belts, as well as interlocking transmission belts such as timing belts, for automobiles, motorcycles, and general industrial machinery. Widely used.

Transmission belts are required to have adhesion, elasticity, and abrasion resistance. Chloroprene rubber is commonly used to manufacture power transmission belts that meet the above properties. Furthermore, in order to improve heat resistance and cold resistance, and to reduce weight, the use of ethylene/propylene/non-conjugated polyene copolymer rubber in place of chloroprene rubber is being considered (for example, see Patent Documents 1 and 2). ). Further, Patent Document 3 describes that a power transmission belt with improved wear resistance can be obtained from a rubber composition containing a specific ethylene/α-olefin/nonconjugated polyene copolymer.

On the other hand, Patent Document 4 describes that a specific ethylene/α-olefin having 4 to 20 carbon atoms/nonconjugated polyene copolymer has an excellent balance of adhesiveness, processability, and fluidity.

JP 2001-310951 A JP2012-215212A JP 2016-44198 A International Publication No. 2015/122415

According to the investigations of the present inventors, there is room for improvement in wrapped belts using conventional rubber compositions from the viewpoint of adhesion to diene rubber constituting the core material.
In order to solve the problems in the conventional techniques, an object of the present invention is to provide a composition for a power transmission belt which has excellent heat resistance and excellent adhesion to a core material.

The inventors of the present invention conducted extensive studies to solve the above-mentioned problems, and found that the above-mentioned problems could be solved by a composition for power transmission belts having the following structure, and thus completed the present invention. That is, the present invention relates to, for example, the following [1] to [4].

［２］
前記共重合体（Ｂ）が下記要件（ｂ－１）および（ｂ－２）を満たす前記［１］の伝動ベルト用組成物。
要件（ｂ－１）：エチレンに由来する構造単位〔ｂ１〕と炭素数３～２０のα－オレフィンに由来する構造単位〔ｂ２〕とのモル比（〔ｂ１〕／〔ｂ２〕）が、５０／５０～７５／２５である。
要件（ｂ－２）：下記式（ｉｂ）で表されるＢ値が１．０５以下である。
Ｂ値＝［ＥＰ］／（２［Ｅ］×［Ｐ］） …（ｉｂ）
〔式（ｉｂ）において、［Ｅ］および［Ｐ］は、それぞれエチレンに由来する構造単位〔ｂ１〕のモル分率および炭素数３～２０のα－オレフィンに由来する構造単位〔ｂ２〕のモル分率を表し、［ＥＰ］は、エチレン・炭素原子数３～２０のα－オレフィンのダイアッド連鎖分率を表す。〕
［３］
前記［１］または［２］の組成物あるいはその架橋物を含む層［Ｉ］と、前記層［Ｉ
］と接する、ジエン系ゴムまたはその架橋物を含む層［II］との積層体。
［４］
前記［３］の積層体を含む伝動ベルト。 [1]
(B) A structural unit [b1] derived from ethylene, a structural unit [b2] derived from an α-olefin having 3 to 20 carbon atoms, and a partial structure represented by the following general formula (I) or (II). A non-conjugated polyene containing a structural unit [b3] derived from a non-conjugated polyene containing only one in the molecule and a total of two or more partial structures represented by the following general formula (I) or (II) in the molecule. an ethylene/α-olefin/nonconjugated polyene copolymer containing the derived structural unit [b4],
(A) Ethylene α containing a structural unit [a1] derived from ethylene, a structural unit [a2] derived from an α-olefin having 4 to 20 carbon atoms, and a structural unit [a3] derived from a non-conjugated polyene. - A composition for a power transmission belt containing an olefin/nonconjugated polyene copolymer (excluding the copolymer (B)) and (C) a surfactant.

[2]
The composition for a power transmission belt according to [1] above, wherein the copolymer (B) satisfies the following requirements (b-1) and (b-2).
Requirement (b-1): The molar ratio ([b1]/[b2]) of the structural unit [b1] derived from ethylene and the structural unit [b2] derived from an α-olefin having 3 to 20 carbon atoms is 50 /50 to 75/25.
Requirement (b-2): The B value expressed by the following formula (ib) is 1.05 or less.
B value = [EP] / (2 [E] × [P]) ... (ib)
[In formula (ib), [E] and [P] are the mole fraction of the structural unit [b1] derived from ethylene and the mole of the structural unit [b2] derived from an α-olefin having 3 to 20 carbon atoms, respectively. [EP] represents the dyad chain fraction of ethylene/α-olefin having 3 to 20 carbon atoms. ]
[3]
A layer [I] containing the composition of [1] or [2] or a crosslinked product thereof;
] in contact with a layer [II] containing a diene rubber or a crosslinked product thereof.
[4]
A power transmission belt including the laminate of [3] above.

The power transmission belt composition of the present invention has excellent heat resistance and excellent adhesion to the core material.

The present invention will be explained in further detail.
[Composition for power transmission belt]
The composition for power transmission belts of the present invention (hereinafter also referred to as "composition of the present invention") comprises an ethylene/α-olefin/non-conjugated polyene copolymer (A) described below and an ethylene/α-olefin/non-conjugated polyene copolymer (A). It is characterized by containing a conjugated polyene copolymer (B) and a surfactant (C).

The power transmission belt composition of the present invention contains an ethylene/α-olefin/non-conjugated polyene copolymer (A) and an ethylene/α-olefin/non-conjugated polyene copolymer (B) as rubber components.

<Ethylene/α-olefin/non-conjugated polyene copolymer (A)>
Ethylene/α-olefin/non-conjugated polyene copolymer (A) (hereinafter also simply referred to as "copolymer (A)") has a structural unit [a1] derived from ethylene [A1] and a carbon number A copolymer having a structural unit [a2] derived from 4 to 20 α-olefins [A2] and a structural unit [a3] derived from a non-conjugated polyene [A3] (however, the copolymer (B ).

The copolymer (A) has a structural unit [a1] derived from ethylene [A1], a structural unit [a2] derived from at least one type of α-olefin having 4 to 20 carbon atoms [A2], and at least one It can have a structural unit [a3] derived from a type of non-conjugated polyene [A3].

《α-olefin having 4 to 20 carbon atoms [A2]》
Examples of the α-olefin [A2] having 4 to 20 carbon atoms include 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-nonadecene, 1 -Linear α-olefins such as eicosene; α-olefins containing side chains such as 4-methyl-1-pentene, 9-methyl-1-decene, 11-methyl-1-dodecene, and 12-ethyl-1-tetradecene can be mentioned. Among these, α-olefins having 4 to 10 carbon atoms are preferred, 1-butene, 1-hexene, and 1-octene are more preferred, and 1-butene is even more preferred, from the viewpoint of excellent balance between adhesiveness and mechanical strength. preferable.
The α-olefin [A2] having 4 to 20 carbon atoms can be used alone or in combination of two or more.

《Nonconjugated polyene [A3]》
Examples of the non-conjugated polyene [A3] include 1,4-hexadiene, 1,6-octadiene, 2-methyl-1,5-hexadiene, 6-methyl-1,5-heptadiene, 7-methyl-1,6 - Chain nonconjugated dienes such as octadiene; cyclohexadiene, dicyclopentadiene, methyltetrahydroindene, 5-vinyl-2-norbornene, 5-ethylidene-2-norbornene, 5-methylene-2-norbornene, 5-isopropylidene- Cyclic non-conjugated dienes such as 2-norbornene, 6-chloromethyl-5-isopropenyl-2-norbornene; 2,3-diisopropylidene-5-norbornene, 2-ethylidene-3-isopropylidene-5-norbornene, 2 -propenyl-2,5-norbornadiene, 1,3,7-octatriene, 1,4,9-decatriene, 4,8-dimethyl-1,4,8-decatriene, 4-ethylidene-8-methyl-1, Examples include trienes such as 7-nonadiene. Among these, from the viewpoint of vulcanization rate, linear nonconjugated dienes such as 1,4-hexadiene, and cyclic nonconjugated dienes such as 5-ethylidene-2-norbornene and 5-vinyl-2-norbornene are preferred; Conjugated dienes are more preferred, and 5-ethylidene-2-norbornene and 5-vinyl-2-norbornene are even more preferred.
Non-conjugated polyene [A3] can be used alone or in combination of two or more.

Examples of the copolymer (A) include ethylene/1-butene/1,4-hexadiene copolymer, ethylene/1-pentene/1,4-hexadiene copolymer, and ethylene/1-hexene/1,4-hexadiene copolymer. -Hexadiene copolymer, ethylene/1-heptene/1,4-hexadiene copolymer, ethylene/1-octene/1,4-hexadiene copolymer, ethylene/1-nonene/1,4-hexadiene copolymer Coalescence, ethylene/1-decene/1,4-hexadiene copolymer, ethylene/1-butene/1-octene/1,4-hexadiene copolymer, ethylene/1-butene/5-ethylidene-2-norbornene copolymer Polymer, ethylene/1-pentene/5-ethylidene-2-norbornene copolymer, ethylene/1-hexene/5-ethylidene-2-norbornene copolymer, ethylene/1-heptene/5-ethylidene-2- Norbornene copolymer, ethylene/1-octene/5-ethylidene-2-norbornene copolymer, ethylene/1-nonene/5-ethylidene-2-norbornene copolymer, ethylene/1-decene/5-ethylidene-2 -norbornene copolymer, and ethylene/1-butene/1-octene/5-ethylidene-2-norbornene copolymer. Among these, ethylene/1-butene/5-ethylidene-2-norbornene copolymer is preferred from the viewpoint of mechanical strength.

《Requirements (a-1) to (a-4')》
Copolymer (A) preferably satisfies any one or more of the following requirements (a-1) to (a-3), more preferably satisfies the following requirements (a-1) to (a-3). . Further, in one embodiment, the copolymer (A) preferably satisfies requirement (a-4) or (a-4') described below.

Requirement (a-1): The molar ratio ([a1]/[a2]) of the structural unit [a1] derived from ethylene and the structural unit [a2] derived from an α-olefin having 4 to 20 carbon atoms is It is 40/60 to 90/10.
The copolymer (A) having a molar ratio within the above range has an excellent balance between rubber elasticity at low temperatures and tensile strength at room temperature.
The lower limit of the molar ratio ([a1]/[a2]) is preferably 45/55, more preferably 50/50, particularly preferably 55/45. Further, the upper limit of the molar ratio ([a1]/[A2]) is preferably 80/20, more preferably 75/25, and even more preferably 70/30.

Requirement (a-2): The content ratio of the structural unit [a3] derived from the non-conjugated polyene is 100 mol%, with the total of the structural unit [a1], the structural unit [a2] and the structural unit [a3] being 100 mol%. , 0.1 to 6.0 mol%. The copolymer (A) having this content within the above range has sufficient crosslinkability and flexibility.
The lower limit of the content of the structural unit [a3] is preferably 0.5 mol%. The upper limit of the content of the structural unit [a3] is preferably 4.0 mol%, more preferably 3.5 mol%, and even more preferably 3.0 mol%.
The proportions of the structural unit [a1], the structural unit [a2] and the structural unit [a3] can be determined by intensity measurement using ^{a 1} H-NMR spectrometer.

Requirement (a-3): The B value expressed by the following formula (ia) is 1.20 or more.
B value = ([EB]+2[Y])/[2×[E]×([B]+[Y])]…(ia)
[In formula (ia), [E], [B] and [Y] are the mole fraction of the structural unit [A1] derived from ethylene, and the structural unit derived from an α-olefin having 4 to 20 carbon atoms, respectively. The mole fraction of [A2] and the mole fraction of the structural unit [A3] derived from the nonconjugated polyene are shown, and [EB] shows the ethylene-α-olefin dyad chain fraction having 4 to 20 carbon atoms. ]
The B value is preferably 1.20 to 1.80, more preferably 1.22 to 1.40.
The copolymer (A) that satisfies requirement (a-3) has high alternation of monomer units constituting the copolymer and low crystallinity, so that the processability of the resulting composition is improved.
The B value is an index indicating the randomness of the copolymerization monomer chain distribution in the copolymer, and [E], [B], [Y], and [EB] in the above formula (ia) are ¹³ C- It can be determined by measuring an NMR spectrum and based on the reports of JCRandall [Macromolecules, 15, 353 (1982)], J. Ray [Macromolecules, 10, 773 (1977)], and others.

Requirement (a-4): Mooney viscosity ML(1+4) 100°C is 5 to 150.
The Mooney viscosity ML(1+4) 100°C is preferably 5 to 100, more preferably 5 to 50. The copolymer (A) having a Mooney viscosity within the above range has good processability and fluidity, exhibits good post-processing quality (ribbon handling properties), and has excellent rubber physical properties.

Requirement (a-4'): Mooney viscosity ML(1+4) 125°C is 3 to 100.
The Mooney viscosity ML(1+4) 125° C. is preferably 3 to 70, more preferably 3 to 30. The copolymer (A) having a Mooney viscosity within the above range has good processability and fluidity, exhibits good post-processing quality (ribbon handling properties), and has excellent rubber physical properties.

The composition of the present invention may contain one type of copolymer (A) or may contain two or more types of copolymers (A).
Since copolymer (A) generally has higher tack than the ethylene-propylene-non-conjugated polyene copolymer contained in conventional rubber compositions, the composition of the present invention containing copolymer (A) has strong bonds between the compounded components, and has excellent belt processability and moldability.

<<Method for producing copolymer (A)>>
Copolymer (A) can be obtained by a conventionally known production method using a metallocene catalyst. As the metallocene catalyst and the production method using the catalyst, for example, the examples described in International Publication No. 2015/122415, particularly paragraphs [0249] to [0320] of the publication can be adopted.

<Ethylene/α-olefin/non-conjugated polyene copolymer (B)>
The ethylene/α-olefin/nonconjugated polyene copolymer (B) (hereinafter also simply referred to as "copolymer (B)") has a structural unit [b1] derived from ethylene and a carbon number of 3 to 20. Structural unit [b2] derived from α-olefin [B2] and non-conjugated polyene [B3] containing only one partial structure represented by the following general formula (I) or (II) in the molecule Contains a structural unit [b3] and a structural unit [b4] derived from a non-conjugated polyene [B4] containing a total of two or more partial structures represented by the following general formula (I) or (II) in the molecule. .

The copolymer (B) has a structural unit [b1] derived from ethylene [B1], a structural unit [b2] derived from at least one type of α-olefin having 4 to 20 carbon atoms [B2], and at least one It can have a structural unit [b3] derived from a type of non-conjugated polyene [B3] and a structural unit [b4] derived from at least one type of non-conjugated polyene [B4].

《α-olefin having 3 to 20 carbon atoms [B2]》
Examples of the α-olefin [B2] having 3 to 20 carbon atoms include propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene, 1- Examples include decene, 1-dodecene, 1-tetradecene, 1-hexadecene, and 1-eicosene. Among these, α-olefins having 3 to 8 carbon atoms, such as propylene, 1-butene, 1-hexene, and 1-octene, are preferred, and propylene is particularly preferred, since they have good mechanical strength. These α-olefins may be used alone or in combination of two or more.

《Nonconjugated polyene [B3]》
The non-conjugated polyene [B3] is
A non-conjugated polyene containing one partial structure represented by the above general formula (I) in the molecule and no partial structure represented by the above general formula (II), or It is a non-conjugated polyene that contains one partial structure represented by the above general formula (I) in its molecule and does not contain a partial structure represented by the above general formula (I) in its molecule.

The partial structure represented by the above general formula (I) is a partial structure of a cyclic olefin. In other words, the partial structure represented by the above general formula (I) consists of two carbon atoms that are adjacent to each other and connected by a double bond that constitute the ring of the cyclic olefin, and one carbon atom for each of the two carbon atoms. It has a structure consisting of an atomic group containing two hydrogen atoms bonded to each other.

For example, 5-ethylidene-2-norbornene (ENB) corresponds to the non-conjugated polyene [B3] because it contains one partial structure represented by the above general formula (I) in one molecule. On the other hand, dicyclopentadiene (DCPD) contains two partial structures represented by the above general formula (I) in one molecule, and therefore falls under the non-conjugated polyene [B4] described below. 5-vinylidene-2-norbornene has one partial structure represented by the above general formula (I) in one molecule and one partial structure represented by the above general formula (II) in one molecule. Therefore, it corresponds to non-conjugated polyene [B4] described below.
Examples of the non-conjugated polyene [B3] include the following aliphatic polyenes and alicyclic polyenes.

Specific examples of the aliphatic polyene include 1,4-hexadiene, 1,5-heptadiene, 1,6-octadiene, 1,7-nonadiene, 1,8-decadiene, 1,12-tetradecadiene, 3- Methyl-1,4-hexadiene, 4-methyl-1,4-hexadiene, 5-methyl-1,4-hexadiene, 4-ethyl-1,4-hexadiene, 3,3-dimethyl-1,4-hexadiene, 5-methyl-1,4-heptadiene, 5-ethyl-1,4-heptadiene, 5-methyl-1,5-heptadiene, 6-methyl-1,5-heptadiene, 5-ethyl-1,5-heptadiene, 4-methyl-1,4-octadiene, 5-methyl-1,4-octadiene, 4-ethyl-1,4-octadiene, 5-ethyl-1,4-octadiene, 5-methyl-1,5-octadiene, 6-methyl-1,5-octadiene, 5-ethyl-1,5-octadiene, 6-ethyl-1,5-octadiene, 6-methyl-1,6-octadiene, 7-methyl-1,6-octadiene, 6-ethyl-1,6-octadiene, 6-propyl-1,6-octadiene, 6-butyl-1,6-octadiene, 7-methyl-1,6-octadiene, 4-methyl-1,4-nonadiene, 5-methyl-1,4-nonadiene, 4-ethyl-1,4-nonadiene, 5-ethyl-1,4-nonadiene, 5-methyl-1,5-nonadiene, 6-methyl-1,5-nonadiene, 5-ethyl-1,5-nonadiene, 6-ethyl-1,5-nonadiene, 6-methyl-1,6-nonadiene, 7-methyl-1,6-nonadiene, 6-ethyl-1,6-nonadiene, 7-ethyl-1,6-nonadiene, 7-methyl-1,7-nonadiene, 8-methyl-1,7-nonadiene, 7-ethyl-1,7-nonadiene, 5-methyl-1,4-decadiene, 5-ethyl-1,4-decadiene, 5-methyl-1,5-decadiene, 6-methyl-1,5-decadiene, 5-ethyl-1,5-decadiene, 6-ethyl-1,5-decadiene, 6-methyl-1,6-decadiene, 6-ethyl-1,6-decadiene, 7-methyl-1,6-decadiene, 7-ethyl-1,6-decadiene, 7-methyl-1,7-decadiene, 8-methyl-1,7-decadiene, 7-ethyl-1,7-decadiene, 8-ethyl-1,7-decadiene, 8-methyl-1,8-decadiene, 9-methyl-1,8-decadiene, Examples include 8-ethyl-1,8-decadiene, 6-methyl-1,6-undecadiene, 9-methyl-1,8-undecadiene, and among these, 7-methyl-1,6-octadiene is preferred. These aliphatic polyenes may be used alone or in combination of two or more.

Examples of the alicyclic polyenes include polyenes composed of an alicyclic portion having one carbon-carbon double bond (unsaturated bond) and a chain portion (ethylidene, propylidene, etc.) bonded to the carbon atom constituting the alicyclic portion by a carbon-carbon double bond. Specific examples include 5-ethylidene-2-norbornene (ENB), 5-propylidene-2-norbornene, 5-butylidene-2-norbornene, etc., with 5-ethylidene-2-norbornene (ENB) being preferred.

Specific examples of other alicyclic polyenes include 2-methyl-2,5-norbornadiene and 2-ethyl-2,5-norbornadiene.

<<Non-conjugated polyene [B4]>>
The non-conjugated polyene [B4] is
A non-conjugated polyene containing two or more partial structures represented by the above general formula (I) in the molecule and not containing a partial structure represented by the above general formula (II) in the molecule;
A non-conjugated polyene containing two or more partial structures represented by the above general formula (II) in the molecule and not containing any partial structure represented by the above general formula (I) in the molecule, or a non-conjugated polyene containing one or more partial structures represented by the above general formula (I) in the molecule and one or more partial structures represented by the above general formula (II) in the molecule.

Examples of the non-conjugated polyene [B4] include alicyclic polyenes having an alicyclic portion having a carbon-carbon double bond (unsaturated bond) and a chain portion that is bonded to a carbon atom constituting the alicyclic portion and contains a vinyl group, and aliphatic polyenes having vinyl groups at both ends of the molecule. Specific examples include 5-alkenyl-2-norbornene such as 5-vinyl-2-norbornene (VNB) and 5-allyl-2-norbornene; alicyclic polyenes such as 2,5-norbornadiene, dicyclopentadiene (DCPD), norbornadiene, and tetracyclo[4,4,0,1 ^2.5 ,1 ^7.10 ]deca-3,8-diene; and aliphatic polyenes such as α,ω-dienes such as 1,7-octadiene and 1,9-decadiene. These may be used alone or in combination of two or more.

Among these, 5-vinyl-2-norbornene (VNB), 5-alkenyl-2-norbornene, dicyclopentadiene, 2,5-norbornadiene, 1,7-octadiene, and 1,9-decadiene are preferred, and 5-vinyl -2-norbornene (VNB) is particularly preferred.

《Requirements (b-1) to (b-4)》
Copolymer (B) preferably satisfies any of the following requirements (b-1) to (b-4), more preferably satisfies the following requirements (b-1) and (b-2).

Requirement (b-1): The molar ratio ([b1]/[b2]) of the structural unit [b1] derived from ethylene and the structural unit [b2] derived from an α-olefin having 3 to 20 carbon atoms is 50 /50 to 75/25.
The molar ratio ([b1]/[b2]) is preferably 50/50 to 70/30, more preferably 55/45 to 65/35.

Requirement (b-2): The B value expressed by the following formula (ib) is 1.05 or less.
B value = [EP] / (2 [E] × [P]) ... (ib)
[In formula (ib), [E] and [P] are the mole fraction of the structural unit [b1] derived from ethylene and the mole of the structural unit [b2] derived from an α-olefin having 3 to 20 carbon atoms, respectively. [EP] represents the dyad chain fraction of ethylene/α-olefin having 3 to 20 carbon atoms. ]

The B value is an index indicating the randomness of the copolymerized monomer chain distribution in the copolymer, and [E], [P], and [EP] in the above formula (ib) are determined by measuring the ¹³ C-NMR spectrum. It can be determined based on the reports of JCRandall [Macromolecules, 15, 353 (1982)], J. Ray [Macromolecules, 10, 773 (1977)], etc.
When the B value is 1.0, the randomness is highest; smaller values indicate higher blockiness, and conversely, higher values indicate higher alternation.
It is preferable that the B value is within the above range because the copolymer (B) has excellent blocking resistance. Further, the closer the B value is to 1.0, the better the randomness is, and the copolymer (B) preferably exhibits excellent low-temperature properties.

As the copolymer (B), an ethylene-propylene-ENB-VNB copolymer is particularly preferred.
The copolymer (B) can be produced by a conventional method, for example, the method described in JP-A-2014-208740, paragraphs [0057] to [0102].

Requirement (b-3): Molar ratio of the content of structural units [B3] derived from non-conjugated polyene [B3] and the content of structural units [B4] derived from non-conjugated polyene [B4] ([B3] /[B4]) is 85/15 to 99.5/0.5.
The molar ratio ([B3]/[B4]) is preferably 90/10 to 99.5/0.5, more preferably 95/5 to 99.5/0.5.

Requirement (b-4): The total content of structural units derived from non-conjugated polyene [B3] and structural units derived from non-conjugated polyene [B4] must be On the other hand, it is preferably 0.5 to 4.5 mol%, more preferably 1.0 to 4.5 mol%, and even more preferably 2.0 to 4.5 mol%. It is preferable that the content is within the above range from the viewpoint of rubbery properties (for example, permanent elongation and compression set) of the copolymer (B).

The respective proportions of the structural unit [b1], the structural unit [b2], the structural unit [b3] and the structural unit [b4] can be determined by intensity measurement using a ¹ H-NMR spectrometer.

The total content of copolymer (A) and copolymer (B) in the composition of the present invention is usually 20% by mass or more, preferably 30 to 90% by mass.
The mass ratio of copolymer (A) and copolymer (B) (copolymer (A)/copolymer (B)) is preferably 90/10 to 50/50, more preferably 80/20. ~60/40, more preferably 75/25 ~ 65/35.

<Surfactant (C)>
The composition for a power transmission belt according to the present invention contains a surfactant (C).
Examples of surfactants (C) include nonionic surfactants, cationic surfactants, anionic surfactants and amphoteric surfactants.

Examples of nonionic surfactants include polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene higher alcohol ether, polyoxyethylene octylphenyl ether, polyoxy Ethylene nonylphenyl ether, polyoxyethylene alkyl ether, polyoxyethylene myristyl ether, polyoxyethylene octyl dodecyl ether, polyoxyethylene alkylene alkyl ether, polyoxyethylene distyrenated phenyl ether, polyoxyethylene derivative, polyoxyethylene polyoxy Propylene glycol, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan tristearate, polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan trioleate, Polyoxyethylene sorbitol tetraoleate, glycerol monostearate, glycerol monooleate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan distearate, sorbitan tristearate, sorbitan monooleate, sorbitan triole ate, sorbitan sesquioleate, polyethylene glycol monolaurate, polyethylene glycol monostearate, polyethylene glycol distearate, polyethylene glycol monooleate, polyoxyethylene hydrogenated castor oil, polyoxyethylene alkylamine, and alkyl alkanolamide. .

Examples of cationic surfactants include coconut amine acetate, stearyl amine acetate, lauryl trimethyl ammonium chloride, stearyl trimethyl ammonium chloride, cetyl trimethyl ammonium chloride, distearyl dimethyl ammonium chloride, dihardened tallow alkyl dimethyl ammonium chloride, alkyl Examples include benzyldimethylammonium chloride, bishydroxyethylalkyl (C8-18) methylammonium chloride, bis(polyoxyethylene)alkyl (C8-18) methylammonium chloride, and bishydroxyethyloleylmethylammonium chloride. Examples of commercially available cationic surfactants include Lipocard (registered trademark) (for example, Lipocard 2HT flakes) and Liposocard (registered trademark) (both manufactured by Lion Specialty Chemicals Co., Ltd.). .

Examples of anionic surfactants include mixed fatty acid soda soap, semi-hardened beef tallow fatty acid soda soap, stearate soda soap, semi-hardened beef tallow fatty acid potassium soap, potassium oleate soap, castor oil potash soap, sodium lauryl sulfate, and high grade. Sodium alcohol sulfate, triethanolamine lauryl sulfate, ammonium lauryl sulfate, sodium dodecylbenzene sulfonate, sodium alkylnaphthalene sulfonate, sodium dialkyl sulfosuccinate, sodium alkyl diphenyl ether disulfonate, potassium alkyl phosphate salt, sodium polyoxyethylene lauryl ether sulfate, Examples include sodium polyoxyethylene alkyl ether sulfate, triethanolamine polyoxyethylene alkyl ether sulfate, sodium polyoxyethylene alkyl phenyl ether sulfate, sodium alkanesulfonate, and sodium salt of β-naphthalenesulfonic acid formalin condensate.

Examples of amphoteric surfactants include lauryl betaine, stearyl betaine, 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, and lauryl dimethylamine oxide.

The surfactant (C) is preferably at least one selected from the group consisting of cationic surfactants and anionic surfactants, and more preferably cationic surfactants.

The content of surfactant (C) in the composition of the present invention is preferably 0.1 to 30 parts by mass, preferably 0.2 to 10.0 parts by mass, and more preferably 0.3 to 5.0 parts by mass, per 100 parts by mass of the total of copolymer (A) and copolymer (B). When the content is within the above range, the composition of the present invention has an excellent balance between mechanical properties and adhesion to the core material.

<Other ingredients>
The composition of the invention preferably further contains a crosslinking agent.
In addition to the above-mentioned components, the composition of the present invention also includes softeners, inorganic fillers (reinforcing agents), anti-aging agents, processing aids, activators, moisture absorbers, It may further contain at least one selected from antistatic agents, colorants, lubricants, and thickeners. Furthermore, the composition of the present invention may further contain other polymers than the copolymer (A) and the copolymer (B), such as an elastomer and/or rubber, to the extent that the effects of the present invention are not impaired. Each of the components described below may be used alone or in combination of two or more.

《Crosslinking agent》
Examples of the crosslinking agent include crosslinking agents commonly used when crosslinking rubber, such as organic peroxides, sulfur compounds, phenolic resins, hydrosilicone compounds, amino resins, quinones or derivatives thereof, Examples include amine compounds, azo compounds, epoxy compounds, and isocyanate compounds. Among these, organic peroxides and sulfur compounds are preferred.

Examples of organic peroxides include dicumyl peroxide, di-tert-butyl peroxide, 2,5-di-(tert-butylperoxy)hexane, 2,5-dimethyl-2,5-di-(tert-butylperoxy)hexane, 2,5-dimethyl-2,5-di-(tert-butylperoxy)hexyne-3, 1,3-bis(tert-butylperoxyisopropyl)benzene, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, n-butyl-4,4-bis(tert-butylperoxy)valerate, benzoyl peroxide, p-chlorobenzoyl peroxide, 2,4-dichlorobenzoyl peroxide, tert-butylperoxybenzoate, tert-butylperoxyisopropylcarbonate, diacetyl peroxide, lauroyl peroxide, and tert-butylcumyl peroxide.

When an organic peroxide is used as a crosslinking agent in the composition of the present invention, the content of the organic peroxide is usually 0.1 to 20 parts by mass, preferably 0.2 to 15 parts by mass, and more preferably 0.5 to 10 parts by mass, per 100 parts by mass of the total of the copolymer (A) and the copolymer (B).

When using an organic peroxide as a crosslinking agent, it is preferable to use a crosslinking aid together. Examples of crosslinking aids include sulfur; quinonedioxime crosslinking aids such as p-quinonedioxime; acrylic crosslinking aids such as ethylene glycol dimethacrylate and trimethylolpropane trimethacrylate; diallyl phthalate and triallyl isocyanurate. Allyl crosslinking aids such as; maleimide crosslinking aids; divinylbenzene; magnesium oxide, zinc oxide type 2 (JIS K1410) (for example, "ZnO #1"; manufactured by Hakusui Tech Co., Ltd.), zinc white (for example, " Examples include metal oxides such as zinc oxide such as "META-Z 102" (trade name; manufactured by Inoue Lime Industry Co., Ltd.).

When the composition of the present invention contains a crosslinking aid, the content of the crosslinking aid is usually 0.5 to 10 moles, preferably 0.5 to 7 moles, and more preferably 1 to 5 moles, per mole of organic peroxide.

When a sulfur compound is used as a crosslinking agent, specific examples include sulfur, sulfur chloride, sulfur dichloride, morpholine disulfide, alkylphenol disulfide, tetramethylthiuram disulfide, and selenium dithiocarbamate.

In the composition of the present invention, when a sulfur-based compound is used as a crosslinking agent, the content of the sulfur-based compound is usually 0 with respect to a total of 100 parts by mass of copolymer (A) and copolymer (B). .3 to 10 parts by weight, preferably 0.5 to 7.0 parts by weight, more preferably 0.7 to 5.0 parts by weight.

When using a sulfur-based compound as a crosslinking agent, it is preferable to use a vulcanization accelerator together. Examples of vulcanization accelerators include:
N-Cyclohexyl-2-benzothiazolesulfenamide, N-oxydiethylene-2-benzothiazolesulfenamide, N,N'-diisopropyl-2-benzothiazolesulfenamide, 2-mercaptobenzothiazole, 2-(4 -morpholinodithio)penzothiazole), 2-(2,4-dinitrophenyl)mercaptobenzothiazole, 2-(2,6-diethyl-4-morpholinothio)benzothiazole, dibenzothiazyl disulfide, etc. Sulfur accelerator;
Guanidine-based vulcanization accelerators such as diphenylguanidine, triphenylguanidine, diorthotolylguanidine;
Aldehyde amine-based vulcanization accelerators such as acetaldehyde/aniline condensates and butyraldehyde/aniline condensates;
Imidazoline vulcanization accelerators such as 2-mercaptoimidazoline;
Thiourea-based vulcanization accelerators such as diethylthiourea and dibutylthiourea;
Thiuram-based vulcanization accelerators such as tetramethylthiuram monosulfide, tetramethylthiuram disulfide, tetraethylthiuram disulfide, tetrabutylthiuram disulfide, dipentamethylenethiuram tetrasulfide;
Dithioate salt-based vulcanization accelerators such as zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, zinc dibutyldithiocarbamate, tellurium diethyldithiocarbamate;
Thiourea-based vulcanization accelerators such as ethylenethiourea (for example, Suncella 22C (trade name; manufactured by Sanshin Kagaku Kogyo Co., Ltd.)), N,N'-diethylthiourea, N,N'-dibutylthiourea;
Xanthate-based vulcanization accelerators such as zinc dibutylxatogenate;
Other examples include zinc white.

When the composition of the present invention contains a vulcanization accelerator, the content of the vulcanization accelerator is usually 0.05 parts per 100 parts by mass of the copolymer (A) and the copolymer (B). The amount is 1 to 20 parts by weight, preferably 0.2 to 15 parts by weight, and more preferably 0.5 to 10 parts by weight.

The vulcanization aid can be preferably used when the crosslinking agent is a sulfur-based compound, such as magnesium oxide, zinc oxide type 2 (JIS K1410) (for example, "ZnO #1"; manufactured by Hakusui Tech Co., Ltd.) , zinc oxide such as zinc white (for example, "META-Z 102" (trade name; manufactured by Inoue Lime Industry Co., Ltd.)).

When the composition of the present invention contains a vulcanization aid, the content of the vulcanization aid is usually 1 to 1 to 100 parts by mass in total of copolymer (A) and copolymer (B). It is 20 parts by mass.

《Softener》
Examples of softeners include:
Petroleum softeners such as process oil, lubricating oil, paraffin oil, liquid paraffin, petroleum asphalt, and petrolatum;
Coal tar-based softeners such as coal tar;
Fatty oil-based softeners such as castor oil, linseed oil, rapeseed oil, soybean oil, coconut oil;
Waxes such as beeswax and carnauba wax;
Fatty acids or salts thereof such as ricinoleic acid, palmitic acid, stearic acid, barium stearate, calcium stearate;
naphthenic acid, pine oil, rosin or derivatives thereof;
Synthetic polymer substances such as terpene resin, petroleum resin, coumaron indene resin;
Ester softeners such as dioctyl phthalate and dioctyl adipate;
Others: microcrystalline wax, liquid polybutadiene, modified liquid polybutadiene, hydrocarbon synthetic lubricating oil, tall oil, sub (factice)
Petroleum-based softeners are preferred, and process oils are more preferred.

When the composition of the present invention contains a softener, the content of the softener is usually 2 to 100 parts by mass, based on a total of 100 parts by mass of the copolymer (A) and the copolymer (B). Preferably it is 5 to 100 parts by mass.

《Inorganic filler (reinforcing material)》
Examples of inorganic fillers (reinforcing materials) include calcium carbonate (e.g., light calcium carbonate, heavy calcium carbonate, activated calcium carbonate), talc (e.g., finely divided talc), clay, silica, finely divided silicic acid, and carbon black. can be mentioned. Among these, carbon black is preferred.

When the composition of the present invention contains an inorganic filler, the content of the inorganic filler is usually from 0.1 to 100 parts by mass in total of copolymer (A) and copolymer (B). The amount is 200 parts by weight, preferably 10 to 200 parts by weight.

《Anti-aging agent (stabilizer)》
By containing the anti-aging agent (stabilizer), the composition of the present invention can extend the life of a (crosslinked) molded article formed from the composition. Examples of anti-aging agents include amine-based anti-aging agents, phenol-based anti-aging agents, and sulfur-based anti-aging agents. Further, it is preferable to use a phenol-based anti-aging agent and a sulfur-based anti-aging agent in combination.

Examples of the amine antioxidant include aromatic secondary amine antioxidants such as phenylbutylamine and N,N-di-2-naphthyl-p-phenylenediamine.
Examples of the phenolic anti-aging agent include dibutylhydroxytoluene and pentaerythritol tetrakis [3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

Examples of sulfur-based anti-aging agents include thioether-based anti-aging agents such as bis[2-methyl-4-(3-n-alkylthiopropionyloxy)-5-t-butylphenyl] sulfide; nickel dibutyldithiocarbamate, etc. Dithiocarbamate-based anti-aging agents; examples include 2-mercaptobenzoylimidazole, 2-mercaptobenzimidazole, zinc salt of 2-mercaptobenzimidazole, dilaurylthiodipropionate, and distearylthiodipropionate.

When the composition of the present invention contains an anti-aging agent, the content of the anti-aging agent is usually from 0.3 to 100 parts by mass in total of the copolymer (A) and the copolymer (B). The amount is 10 parts by weight, preferably 0.5 to 7.0 parts by weight.

《Processing aid》
As the processing aid, a wide variety of processing aids that are generally blended into rubber can be used. Examples of processing aids include ricinoleic acid, stearic acid, palmitic acid, lauric acid, barium stearate, zinc stearate, calcium stearate, and esters. Among these, stearic acid is preferred.

When the composition of the present invention contains a processing aid, the content of the processing aid is usually 10 parts by mass or less based on a total of 100 parts by mass of copolymer (A) and copolymer (B). , preferably 8.0 parts by mass or less.

《Activator》
Examples of the activator include amines such as di-n-butylamine, dicyclohexylamine, and monoelanolamine; diethylene glycol, polyethylene glycol, lecithin, triaryl utmerate, and zinc compounds of aliphatic carboxylic acids or aromatic carboxylic acids. Activators; zinc peroxide preparation; octadecyltrimethylammonium bromide, synthetic hydrotalcite.

When the composition of the present invention contains an active agent, the content of the active agent is usually 0.2 to 10 parts by weight based on a total of 100 parts by weight of copolymer (A) and copolymer (B). parts, preferably 0.3 to 5 parts by weight.

《Moisture absorbent》
Examples of the moisture absorbent include calcium oxide, silica gel, sodium sulfate, molecular sieve, zeolite, and white carbon.

When the composition of the present invention contains a moisture absorbent, the content of the moisture absorbent is usually 0.5 to 15 parts by mass, preferably 1.0 to 12 parts by mass, per 100 parts by mass of the total of copolymer (A) and copolymer (B).

《Other polymers》
The composition of the present invention can further contain other polymers than the copolymer (A) and the copolymer (B).

Examples of other polymers that require crosslinking include rubbers such as natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, butyl rubber, acrylic rubber, silicone rubber, fluororubber, and urethane rubber. It will be done.

Examples of other polymers that do not require crosslinking include block copolymers of styrene and butadiene (SBS), polystyrene-poly(ethylene-butylene)-polystyrene (SEBS), polystyrene-poly(ethylene-propylene)-polystyrene ( Styrene thermoplastic elastomer (TPS) such as SEPS), olefin thermoplastic elastomer (TPO), polyvinyl chloride elastomer (TPVC), ester thermoplastic elastomer (TPC), amide thermoplastic elastomer (TPA), urethane thermoplastic elastomer Examples include elastomers such as plastic elastomer (TPU) and other thermoplastic elastomers (TPZ).

When the composition of the present invention contains other polymers, the content of the other polymers is usually 100 parts by mass or less based on a total of 100 parts by mass of copolymer (A) and copolymer (B). , preferably 80 parts by mass or less.

<Preparation of composition>
The composition of the present invention can be prepared by mixing the copolymer (A), the copolymer (B), the surfactant (C), and other components blended as necessary with, for example, a mixer, a kneader, It can be prepared by kneading at a desired temperature using a kneader such as a roll.

One embodiment of the composition of the invention is prepared, for example, as follows. Copolymer (A), copolymer (B), and other components as necessary are put into a kneader and kneaded under predetermined heating conditions (for example, at 80 to 200°C for 3 to 30 minutes). and homogenize it (A kneading). In addition, in the A kneading, a crosslinking agent, etc., which crosslinks the copolymer (A) and the copolymer (B) when heated to the heating temperature of the A kneading, is not added.

After the temperature of the mixture kneaded in A-kneading is then lowered to below the crosslinking temperature of the crosslinking agent (for example, 130°C or lower), the crosslinking agent etc. that were not added in A-kneading are added to the mixture, and a predetermined amount is obtained. The composition of the present invention can be obtained by further kneading and homogenizing under heating conditions (for example, roll temperature of 30 to 80°C for 1 to 30 minutes) (Kneading B). The surfactant (C) is basically added during mixing A, but may be added during mixing B.

The composition of the present invention has excellent heat resistance and excellent adhesion to the core material. In the laminate of the present invention described later, the surfactant (C) can be used by bleeding out onto the surface of layer [I] or by increasing the dispersibility of the anti-aging agent when the composition contains an anti-aging agent. It is presumed that this contributes to improving the adhesion between layer [I] and layer [II] such as the core material.

[Laminated body and power transmission belt]
The laminate of the present invention is a laminate of a layer [I] containing the composition of the present invention or a crosslinked product thereof, and a layer [II] containing a diene rubber or a crosslinked product thereof, which is in contact with the layer [I]. be.

The layer [I] can be formed from the composition of the present invention, and can be molded, for example, by a thermoforming method such as extrusion molding, injection molding, press molding, calendar molding, transfer molding, or foam molding. When crosslinking the composition, the crosslinking temperature is usually 140°C or higher, preferably 150 to 220°C, more preferably 160 to 200°C. Moreover, this crosslinking reaction can be performed in air.

The composition of the present invention has high adhesive strength suitable for molding processability and is excellent in belt processability. Further, by using the composition of the present invention, it is possible to produce a component for a power transmission belt that has high rubber elasticity, excellent abrasion resistance, heat resistance, and cold resistance.

The layer [I] can be suitably used as a component of a power transmission belt.
The layer [II] can be formed from diene rubber, and can be molded, for example, by a thermoforming method such as extrusion molding, injection molding, press molding, calendar molding, transfer molding, or foam molding.

Diene rubbers are rubbers having double bonds in the main chain of the polymer, examples of which include NR, IR, BR, SBR, NBR, CR and IIR. These may be used alone or in combination of two or more.

When the layer [II] is a crosslinked product of a diene rubber, a crosslinking agent conventionally used for diene rubbers can be used as the crosslinking agent for the diene rubber. When the diene rubber is crosslinked, the crosslinking temperature is usually 140°C or higher, preferably 150 to 220°C, and more preferably 160 to 200°C. This crosslinking reaction can be carried out in air.

Furthermore, the laminate of the present invention is preferably a laminate obtained by laminating a layer [I] containing the composition of the present invention containing the crosslinking agent (i.e., an uncrosslinked composition) and a layer [II] containing the diene rubber (i.e., an uncrosslinked rubber) so as to be in contact with each other, and then heat treating the laminate at a crosslinking temperature.

In such a laminate, crosslinking occurs between the rubber components (the copolymer (A) and the copolymer (B)) contained in the composition of the present invention and the diene rubber. Therefore, it is considered that the layer [I] exhibits particularly excellent adhesion to the layer [II].

This crosslinking temperature is usually 140°C or higher, preferably 150 to 220°C, more preferably 160 to 200°C. Moreover, this heat treatment can be performed in air.

The power transmission belt of the present invention has the above-mentioned laminate of the present invention.
Examples of the transmission belt of the present invention include friction transmission belts such as V-belts and V-ribbed belts, and meshing transmission belts such as timing belts. Examples of the transmission belt include automobile transmission belts, motorcycle transmission belts, and general industrial machine transmission belts. Examples of the V-belt include wrapped belts and raw edge belts.

One embodiment of the power transmission belt has, for example, an adhesive rubber part in which a core wire is embedded, and can further include a bottom rubber part formed on the lower surface of the adhesive rubber part. The transmission belt may have an upper canvas formed on the adhesive rubber part and/or a lower canvas formed under the bottom rubber, as necessary. A canvas adhesive rubber layer may be interposed between the adhesive rubber part and the upper canvas and between the bottom rubber part and the lower canvas.

The composition of the present invention is preferably used, for example, to form a rubber layer for adhering canvas. Specifically, a cross-linked molded article formed from the composition of the present invention is preferably used as the rubber layer for adhering canvas.

The rubber used for forming the adhesive rubber part and/or the bottom rubber part is preferably the diene rubber mentioned above.
The core wire, which is a tensile member of the power transmission belt, extends in the longitudinal direction of the belt at the adhesive rubber portion. Examples of the core wire include polyester cords. The adhesive rubber portion surrounds the core wire and is bonded to the core wire.

In another embodiment, for example, the composition of the present invention may be placed around the core wire and crosslinked to form an adhesive rubber portion adhered to the core wire.
Examples of the canvas include those made of cotton, a blend of cotton and polyester, and those made of a blend of cotton and polyamide.

The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples.
[Measurement methods: Properties of ethylene-α-olefin-non-conjugated polyene copolymer (A), etc.]
The physical properties of the ethylene/α-olefin/non-conjugated polyene copolymer (A) were measured as follows.

<Molar amount of structural units derived from ethylene, structural units derived from α-olefin, and structural units derived from non-conjugated polyene>
The molar amount was determined by intensity measurement using a ¹ H-NMR spectrometer. Details of the measurement conditions are described in International Publication No. 2015/122415.

<B value>
Using o-dichlorobenzene-d ₄ /benzene-d ₆ (4/1 [v/v]) as the measurement solvent, ^{the 13} C-NMR spectrum (100 MHz, JEOL ECX400P) was measured at a measurement temperature of 120°C. , Copolymer (A) was calculated based on the following formula (ia), and copolymer (B) was calculated based on the following formula (ib).
B value = ([EB]+2[Y])/[2×[E]×([B]+[Y])]…(ia)
B value=[EP]/(2[E]×[P])…(ib)
[The meanings of [E], [B], [P], [Y], [EB] and [EP] are as described above. ]

[Measurement method: Physical properties of composition, etc.]
The physical properties of the compositions and the like in the examples and comparative examples were measured as follows.
<Hardness test (Durometer-A)>
The flat portions of the 2 mm thick crosslinked sheets produced in the Examples and the like were overlapped to form a 12 mm thick sheet, and the hardness (JIS-A) was measured in accordance with JIS K6253.

<Tensile test: modulus, tensile stress at break, tensile elongation at break>
A No. 3 dumbbell test piece as described in JIS K6251 (1993) was prepared by punching out the crosslinked sheet with a thickness of 2 mm prepared in Examples, etc., and using this test piece, the test piece was tested as specified in JIS K6251, Section 3. A tensile test was conducted at a measurement temperature of 25°C and a tensile speed of 500 mm/min according to the method described above, and the tensile stress (25% modulus (M25) to 300% modulus (M300 )), tensile stress at break (TB) and tensile elongation at break (EB) were measured.

<Heat resistance test (heat aging resistance test)>
A heat aging test was conducted on the crosslinked sheets having a thickness of 2 mm produced in Examples and the like by holding them at 140° C. for 72 hours in accordance with JIS K6257. The hardness, TB and EB of the sheet after the heat aging test were measured in the same manner as in the hardness test and tensile test items.

AH (hardness after heat aging test - hardness before heat aging test), AR(TB) (TB after heat aging test / TB before heat aging test x 100), and AR(EB) (EB after heat aging test / EB before heat aging test x 100) were calculated.

<Peeling test>
In accordance with JIS K6854-3, a T-peel test was conducted at a measurement temperature of 23.0°C, a test speed of 200 mm/min, and a specimen width of 25.0 mm. The force required to peel off the body was measured.

[Manufacture example 1]
<Production of ethylene/α-olefin/non-conjugated polyene copolymer (A)>
According to the description in [Synthesis Example C1] of International Publication No. 2015/122415, an ethylene/1-butene/5-ethylidene-2-norbornene (ENB) copolymer (copolymer (A)) having the following physical properties was prepared. ) was obtained. Hereinafter, this will be referred to as "EBDM-1".
The structure and physical properties of EBDM-1 are as follows.
Structural unit derived from ethylene: 67.7 mol%
Structural unit derived from 1-butene: 30.0 mol%
Structural unit derived from ENB: 2.3 mol%
Mooney viscosity ML(1+4)100℃: 30
Mooney viscosity ML(1+4)125℃:22
B value: 1.3

[Production example 2]
<Manufacture of adherend (layer (II))>
Details of the raw materials used to produce the adherends are shown in Table 1 below.

As a first step, 60 parts by mass of NR and 40 parts by mass of SBR were masticated for 1 minute using a BB-4 Banbury mixer (manufactured by Kobe Steel, Ltd.), and then 5 parts by mass of ZnO #1 was added to this. 1 part by mass of stearic acid, 70 parts by mass of carbon black (Asahi #60UG, manufactured by Asahi Carbon Co., Ltd.), and 3 parts by mass of Nocrac 224 were added and kneaded at 110° C. for 3 minutes. Thereafter, the ram was raised and cleaned, and kneaded for 2 minutes and discharged at 125°C to obtain the first stage formulation a. The kneading conditions at the time of preparing Compound a were a rotor rotation speed of 40 rpm and a floating weight pressure of 3 kgf/cm ² .

Next, after confirming that the temperature of Formulation 1 had reached 40°C, using an 8-inch roll, 3.5 parts by mass of sulfur and a vulcanization accelerator (Suncellar CM, Sanshin Chemical Industry) were added to Formulation A. (manufactured by Sanshin Kagaku Kogyo Co., Ltd.) and 0.2 parts by mass of a vulcanization accelerator (Suncella DM, manufactured by Sanshin Kagaku Kogyo Co., Ltd.) were added and kneaded, and the mixture was separated for 8 minutes. , formulation b was obtained. The kneading conditions during preparation of compound b were as follows: roll temperature: front roll/rear roll = 50°C/50°C; roll circumferential speed: front roll/rear roll = 18 rpm/15 rpm; roll gap: 3 mm.

Subsequently, the mixture b was subjected to a press treatment at 80° C. for 2 minutes using a press molding machine to produce an adherend (layer [II]) with a thickness of 1 mm.

[Example 1]
<Composition>
As a first step, using a BB-4 Banbury mixer (manufactured by Kobe Steel, Ltd.), 70 parts by mass of EBDM-1 obtained in Production Example 1 and 30 parts by mass of Mitsui EPT 9090M (manufactured by Mitsui Chemicals, Ltd.) were added. 5 parts by mass of zinc white (META-Z 102, manufactured by Inoue Lime Industry Co., Ltd.), 1 part by mass of stearic acid, and a hindered phenol antioxidant (Irganox 1010, manufactured by BASF). ) 2 parts by mass, sulfur-based anti-aging agent (Sandant MB, manufactured by Sanshin Kagaku Kogyo Co., Ltd.) 4 parts by mass, carbon black (Asahi #60UG, manufactured by Asahi Carbon Co., Ltd.) 120 parts by mass, silica (Nipsil VN3, 10 parts by mass of Tosoh Silica Co., Ltd.) and 80 parts by mass of paraffinic process oil (Diana Process PW-380, manufactured by Idemitsu Kosan Co., Ltd.) were added and kneaded at 120° C. for 2 minutes. Thereafter, the ram was raised and cleaned, and kneading was further performed for 2 minutes, and the mixture was discharged at 144° C. to obtain a first-stage formulation 1.

The kneading conditions for preparing Blend 1 were a rotor rotation speed of 40 rpm and a floating weight pressure of 3 kgf/cm ² .
Next, after confirming that the temperature of Compound 1 had reached 40°C, 1.2 parts by mass of sulfur, 1 part by mass of a vulcanization accelerator (Suncerer DM, manufactured by Sanshin Chemical Industry Co., Ltd.), 4 parts by mass of a vulcanization accelerator (RHENOCURE TP/S, manufactured by LANXESS), and 0.5 parts by mass of a surfactant (Lipocard 2HT flake, manufactured by Lion Specialty Chemicals Co., Ltd.) were added to Compound 1 using an 8-inch roll and kneaded, and then dispensed for a kneading time of 8 minutes to obtain Compound 2.

The kneading conditions for preparing compound 2 were: roll temperature front roll/rear roll = 50°C/50°C, roll peripheral speed front roll/rear roll = 18 rpm/15 rpm, roll gap 3 mm.

Compound 2 was pressed at 80° C. for 2 minutes using a press molding machine to produce an unvulcanized sheet having a thickness of 1 mm. Compound 2 was pressed at 165° C. for 25 minutes using a press molding machine to produce a crosslinked sheet having a thickness of 2 mm.
The unvulcanized sheet and the crosslinked sheet obtained were subjected to various measurements. The results are shown in Table 2.

<Laminated body>
The obtained unvulcanized sheet with a thickness of 1 mm was laminated on the adherend produced in Production Example 2, and press-treated at 160° C. for 10 minutes using a press molding machine to produce a laminate with a thickness of 2 mm.
A peel test was conducted on the obtained laminate. The results are shown in Table 2.

[Comparative Examples 1 and 2]
The same procedure as in Example 1 was carried out except that the composition and curing system were based on those listed in Table 2.
Materials used in Examples and Comparative Examples are shown in Table 2 below.

Claims (4)

(B) A structural unit [b1] derived from ethylene, a structural unit [b2] derived from an α-olefin having 3 to 20 carbon atoms, and a partial structure represented by the following general formula (I) or (II). A non-conjugated polyene containing a structural unit [b3] derived from a non-conjugated polyene containing only one in the molecule and a total of two or more partial structures represented by the following general formula (I) or (II) in the molecule. an ethylene/α-olefin/nonconjugated polyene copolymer containing the derived structural unit [b4],
(A) Ethylene α containing a structural unit [a1] derived from ethylene, a structural unit [a2] derived from an α-olefin having 4 to 20 carbon atoms, and a structural unit [a3] derived from a non-conjugated polyene. - A composition for a power transmission belt containing an olefin/nonconjugated polyene copolymer (excluding the copolymer (B)) and (C) a surfactant.

The composition for a power transmission belt according to claim 1, wherein the copolymer (B) satisfies the following requirements (b-1) and (b-2).
Requirement (b-1): The molar ratio ([b1]/[b2]) of the structural unit [b1] derived from ethylene and the structural unit [b2] derived from an α-olefin having 3 to 20 carbon atoms is 50 /50 to 75/25.
Requirement (b-2): The B value expressed by the following formula (ib) is 1.05 or less.
B value = [EP] / (2 [E] × [P]) ... (ib)
[In formula (ib), [E] and [P] are the mole fraction of the structural unit [b1] derived from ethylene and the mole of the structural unit [b2] derived from an α-olefin having 3 to 20 carbon atoms, respectively. [EP] represents the dyad chain fraction of ethylene/α-olefin having 3 to 20 carbon atoms. ] A layer [I] comprising the composition according to claim 1 or 2 or a crosslinked product thereof, and the layer [I
] and a layer [II] containing a diene rubber or a crosslinked product thereof, the layer [II] being in contact with the diene rubber or a crosslinked product thereof. A power transmission belt comprising the laminate according to claim 3.