Modified olefin-based polymer, resin composition, method for producing modified olefin-based polymer, method for producing resin composition, structural part for mechanical device, and mechanical device

Abstract

To provide a modified olefinic polymer capable of giving a resin composition that is excellent in rigidity and toughness and a method for producing the same, a resin composition excellent in rigidity and toughness and a method for producing the same, a structural component of a mechanical apparatus formed of the resin composition, and a mechanical apparatus having a structural component formed of the resin composition.SOLUTION: A modified olefinic polymer 1 (hereinafter referred to as a polymer 1) has a chemical structure 2 which is bound to a first main chain 3 and promotes production of a crystal nucleus with another olefinic polymer. A resin composition contains the polymer 1. A method for producing the polymer 1 includes a first kneading step of kneading a chemical structure 2 for promoting production of an olefinic polymer, a peroxide, and a crystal nucleus with the other olefinic polymer, and a compound having a C=C bond to produce the polymer 1. The method for producing the resin composition includes a second kneading step of kneading the polymer 1 and the olefinic polymer to produce the resin composition after the first kneading step.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a modified olefin-based polymer, a resin composition, a method for producing a modified olefin-based polymer, a method for producing a resin composition, a structural part for a mechanical device, and a mechanical device. [Background technology]

[0002] Polypropylene (PP) resin is widely used in various fields such as automotive interior materials, daily necessities, housings for electrical appliances, etc. The use of PP resin in structural components is expected to reduce costs, be environmentally friendly, and reduce weight, but toughness and rigidity may be insufficient.

[0003] Techniques to improve these problems include (1) adding a crystal nucleating agent to PP resin and (2) using elastomers. The above method (1) involves adding a crystal nucleating agent to the PP resin to microcrystallize it and adjust the balance between rigidity and toughness. This method suppresses stress concentration and inhibits a decrease in toughness by microcrystallizing (i.e., reducing the crystal size), but since it does not increase the tie molecule density, its effectiveness is limited. The above method (2) improves toughness by using an elastomer, but this results in a significant decrease in rigidity.

[0004] Furthermore, a technique for improving the above-mentioned problems has been proposed, for example, in Patent Document 1. The technique described in Patent Document 1 is a polypropylene resin composition containing components (A), (B), (C), (D), and (E) in specific ratios, and having a melt mass flow rate (MFR) of 70 to 100 g / 10 min for the entire composition. The above-mentioned (A) component is composed of a homopolypropylene component and an ethylene-propylene copolymer component, and is a polypropylene having MFR, intrinsic viscosity of the xylene soluble matter, content of the ethylene-propylene copolymer component, and propylene content of the ethylene-propylene copolymer component, each within a predetermined range. The component (B) is an ethylene-α-olefin (C4-8) copolymer, and is an elastomer having an MFR and a density each within a given range. The component (C) is an ethylene-α-olefin (C4-8) copolymer, which is an elastomer having long chain branches and having an MFR and density each within a specified range. The component (D) is a crystal nucleating agent. Component (E) is magnesium stearate. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2018-104673 A Summary of the Invention [Problem to be solved by the invention]

[0006] The technology described in Patent Document 1 achieves a balance between rigidity and impact resistance (toughness) by setting the polypropylene ratio within a specific range and adding a crystal nucleating agent to the PP resin composition. However, the technology described in Patent Document 1 does not increase the tie molecule density like the method (1) above, so its effectiveness is thought to be limited.

[0007] The present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a modified olefin-based polymer which can give a resin composition excellent in rigidity and toughness and a method for producing the same, a resin composition excellent in rigidity and toughness and a method for producing the same, a structural part of a mechanical device formed from the resin composition, and a mechanical device having a structural part formed from the resin composition. [Means for solving the problem]

[0008] As a result of intensive research and development to solve the above problems, the inventors of the present invention have noticed that the crystal structure of crystalline resins such as PP resin and polyethylene (PE) resin affects the physical properties. For example, it is believed that the macroscopic destruction of a material is initiated by the destruction of lamellar aggregates. Therefore, the inventors thought that the lamellar aggregates could be toughened by increasing the number of tie molecules, which are molecular chains that span between lamellar crystals, and thus the toughness could be enhanced, which led to the completion of the present invention.

[0009] That is, the above-mentioned problems of the present invention are solved by the following means. 1. Polypropylene or polyethylene A polymer having a first main chain and a chemical structure bonded to the first main chain that promotes the formation of crystal nuclei with other olefin-based polymers. The other olefin-based polymer is polypropylene or polyethylene, and the chemical structure is an anthracene derivative structure. , modified olefin polymers.

[0014] 2 .The above 1 to A resin composition comprising the modified olefin-based polymer described above.

[0015] 3 The composition contains the olefin polymer in a composition ratio of 85% by mass to 99% by mass and the modified olefin polymer in a composition ratio of 1% by mass to 15% by mass, when the total content of the olefin polymer and the modified olefin polymer is taken as 100% by mass. 2 The resin composition according to claim 1.

[0016] 4 The method includes a first kneading step in which a modified olefin polymer is produced by kneading an olefin polymer that is a first main chain, a peroxide, and a compound having a chemical structure and a C=C bond that promotes the formation of crystal nuclei with other olefin polymers. the olefin-based polymer forming the first main chain is polypropylene or polyethylene, the other olefin-based polymer is polypropylene or polyethylene, and the chemical structure is an anthracene derivative structure. A method for producing a modified olefin polymer.

[0017] 5The method includes a first kneading step of producing a modified olefin polymer by kneading an olefin polymer that is a first main chain, a peroxide, and a compound having a chemical structure and a C=C bond that promotes the formation of crystal nuclei with other olefin polymers, and a second kneading step of kneading the modified olefin polymer and the olefin polymer to produce a resin composition. the olefin-based polymer forming the first main chain is polypropylene or polyethylene, the other olefin-based polymer is polypropylene or polyethylene, and the chemical structure is an anthracene derivative structure; A method for producing a resin composition.

[0018] 6 .The above 2 or the above 3 A structural part of a mechanical device formed from the resin composition according to claim 1.

[0019] 7 .The above 2 or the above 3 A mechanical device having a structural part formed from the resin composition according to claim 1. Effect of the Invention

[0020] According to the present invention, it is possible to provide a modified olefin-based polymer which gives a resin composition having excellent rigidity and toughness and a method for producing the same, a resin composition having excellent rigidity and toughness and a method for producing the same, a structural part of a mechanical device formed from the resin composition, and a mechanical device having a structural part formed from the resin composition. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a conceptual diagram illustrating the structure of a modified olefin-based polymer according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a conceptual diagram illustrating the crystal structure of a resin composition using a modified olefin-based polymer according to the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] The modified olefin-based polymer, the resin composition, the method for producing the modified olefin-based polymer, the method for producing the resin composition, the structural parts of the mechanical device, and the mechanical device according to an embodiment will be described in detail below. Note that the following detailed description shows a preferred embodiment, and does not limit the contents of the present invention in any way.

[0023] (Modified olefin polymer 1) FIG. 1 is a conceptual diagram illustrating the structure of a modified olefin-based polymer 1 according to this embodiment. As shown in FIG. 1, the modified olefin-based polymer 1 according to this embodiment has a first main chain 3 and a chemical structure 2 bonded to the first main chain 3, which promotes the formation of crystal nuclei with another olefin-based polymer that is the main component of the resin composition. Here, the other olefin-based polymer is the main component of the resin composition described later. The main component means that it has the largest content in the resin composition, and for example, the content is 50% by mass or more, 60% by mass or more, 70% by mass or more, 80% by mass or more, 85% by mass or more, 90% by mass or more, 95% by mass or more, or 99% by mass or more, and in this embodiment, it is more preferable that the content is 85% by mass or more, 90% by mass or more, 95% by mass or more, or 99% by mass or more.

[0024] 1 shows the modified olefin-based polymer 1 having the chemical structure 2 in the middle of the first main chain 3, but the chemical structure 2 may be present at an end of the modified olefin-based polymer 1. The chemical structure 2 may be present not only in the middle of the first main chain 3 of the modified olefin-based polymer 1 but also at the end.

[0025] FIG. 2 is a conceptual diagram illustrating a crystal structure 4 of a resin composition using a modified olefin-based polymer 1 according to this embodiment. The modified olefin-based polymer 1 according to this embodiment is used as an additive that is added during the production of a resin composition described below. Both the modified olefin-based polymer 1 and the other olefin-based polymers described above are crystalline polymers (crystalline resins, crystalline plastics). As shown in FIG. 2, when the modified olefin-based polymer 1 and the other olefin-based polymer generate (combine) crystal nuclei, the number of tie molecules 6, which are molecular chains spanning between the lamellar crystals 5, increases. In other words, the modified olefin-based polymer 1 becomes the tie molecule 6 via the chemical structure 2 described above. Therefore, in a resin composition to which the modified olefin-based polymer 1 is added, the lamellar aggregates are toughened, thereby enhancing the toughness of the resin composition.

[0026] Considering the efficient production of tie molecules 6, it is preferable that one modified olefin-based polymer 1 has the above-mentioned chemical structure 2 at two or more positions. The modified olefin-based polymer 1 can be obtained by introducing (bonding) the above-mentioned chemical structure 2 to an unmodified olefin-based polymer. A method for introducing (bonding) the above-mentioned chemical structure 2 to an unmodified olefin-based polymer, that is, a method for producing the modified olefin-based polymer 1, will be described later.

[0027] Examples of (unmodified) olefin-based polymers that can be used for the modified olefin-based polymer 1 include polypropylene (PP), polyethylene (PE), and copolymers containing propylene and ethylene, but are not limited to these as long as they are crystalline polymers. As for other olefin-based polymers, the same olefin-based polymer as the modified olefin-based polymer 1 can be used. The modified olefin polymer 1 and the other olefin polymers may each be one type of polymer selected from the above, or two or more types of polymers may be used in combination. In addition, the modified olefin polymer 1 and the other olefin polymer are preferably the same type of polymer selected from the above, but different types of polymers may also be used. The other olefin-based polymer may be one which has been modified by bonding with any compound or the like, or may be one which is unmodified.

[0028] The chemical structure 2 in this embodiment can have at least one of a chain structure and a cyclic structure. 1, the chain-like chemical structure 2 is bonded as a side chain to a first main chain 3. The number of carbon atoms in the first main chain 3, which is the main chain of the modified olefin-based polymer 1, is not particularly limited.

[0029] On the other hand, the chain-like chemical structure 2 bonded to the first main chain 3 as a side chain has, for example, a second main chain (not shown) of the chemical structure 2 having 30 or less carbon atoms, and contains a hydrocarbon having 2 or less carbon atoms as a side chain bonded to this second main chain. In this way, since chemical structure 2 has a structure similar to that of a polyolefin polymer, when modified olefin polymer 1 is mixed with an unmodified olefin polymer with the same skeleton, it tends to come together with the unmodified olefin polymer, and since the carbon chain is short enough, it is difficult to become entangled, and it becomes easy to molecular-orient the surrounding olefin polymers with chemical structure 2 as the starting point (the probability of crystallization can be increased), so it can act as a crystal nucleating agent. If such a phenomenon occurs multiple times within one polymer, or multiple times within the size range of one polymer, it becomes easy to form a single molecular chain (tie molecule) that spans multiple lamellae. Examples of hydrocarbons having 2 or less carbon atoms include methyl and ethyl groups, with methyl groups being preferred.

[0030] As such a chemical structure 2, for example, t-butyl (-C(CH 3 ) 3 ) structure. In this way, the t-butyl structure of chemical structure 2 can more reliably orient the surrounding olefin polymer. Therefore, chemical structure 2 of this embodiment can play the role of a crystal nucleating agent. Furthermore, chemical structure 2 of this embodiment can cause this phenomenon to occur multiple times within one polymer, or multiple times within the size range of one polymer. Therefore, chemical structure 2 of this embodiment can more easily form one molecular chain (tie molecule) spanning multiple lamellae.

[0031] The t-butyl structure can be introduced, for example, by using t-butyl acrylate shown in structural formula (1) or 4-tert-butylstyrene shown in structural formula (2).

[0032] [ka]

[0033] [ka]

[0034] In the case of the chemical structure 2 having a cyclic structure, for example, it may contain a cyclic structure having 6 or more atoms. In this way, since the cyclic structure having 6 or more atoms is a structure close to a plane and molecular chain entanglement is unlikely to occur, it is possible to promote molecular orientation of the unmodified olefin polymer in contact therewith and promote crystallization. Therefore, the chemical structure 2 of this embodiment can play the role of a crystal nucleating agent. In addition, the chemical structure 2 of this embodiment can cause this phenomenon to occur multiple times within one polymer, or multiple times within the range of one polymer size. Therefore, the chemical structure 2 of this embodiment makes it easier to form one molecular chain (tie molecule) spanning multiple lamellae.

[0035] The ring structure having 6 or more atoms may be a carbocyclic compound in which all atoms constituting the ring are carbon, or a heterocyclic compound containing one or more heteroatoms selected from atoms other than carbon atoms, such as nitrogen atoms, oxygen atoms, and sulfur atoms, as atoms constituting the ring. The ring structure having 6 or more atoms may be a monocyclic compound or a polycyclic compound. In the case of a polycyclic compound, each ring may or may not be a condensed ring. The condensed ring refers to two or more rings sharing two or more atoms. The ring structure having 6 or more atoms is a group consisting of the remaining atomic group after removing one or more hydrogen atoms.

[0036] An example of such a chemical structure 2 is an anthracene derivative structure. An anthracene derivative has a structure in which three benzene rings are linearly condensed, and at least one of the carbons at positions 1 to 10 in the structure may be linked directly or via a crosslinking group to a substituted or unsubstituted aliphatic hydrocarbon group, alicyclic hydrocarbon group, aromatic hydrocarbon group, or heterocyclic group having 1 to 30 carbon atoms, preferably 1 to 14 carbon atoms. The anthracene derivative structure has high planarity, which further promotes molecular orientation of the unmodified olefin polymer in contact with it, thereby further accelerating crystallization.

[0037] Examples of the substituted or unsubstituted aliphatic hydrocarbon group, alicyclic hydrocarbon group, aromatic hydrocarbon group or heterocyclic group having 1 to 30 carbon atoms, preferably 1 to 14 carbon atoms, include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a pentyl group, a tert-pentyl group, an isopentyl group, a neopentyl group, a hexyl group, a vinyl group, an allyl group, a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a cyclooctenyl group, a cyclopentadienyl group, a benzene ring group, a naphthalene ring group, an anthracene ring group, a phenanthrene ring group, a biphenyl ring group, a pyridine ring group, a phenyl ... Examples of the ring group include an aryl ring group, an indole ring group, an isoindole ring group, a carbazole ring group, a furan ring group, a coumarone ring group, an isobenzofuran ring group, a thiophene ring group, a benzothiophene ring group, a dibenzothiophene ring group, an oxazine ring group, a benzoxazine ring group, a phenoxazine ring group, a thiazine ring group, a benzothiazine ring group, a phenothiazine ring group, an oxadiazine ring group, a thiadiazine ring group, a benzodioxole ring group, a benzodioxane ring group, a pyran ring group, a chromene ring group, a xanthene ring group, a chroman ring group, an isochroman ring group, a pyrrolidine ring group, an imidazolidine ring group, an oxazolidine ring group, a thiazolidine ring group, a piperazine ring group, a piperidine ring group, a morpholine ring group, and a dithiolylidene ring group (for example, a 1,3-dithiol-2-ylidene group). Substitution in these groups can be achieved by replacing an atom (for example, a hydrogen atom or a carbon atom) at any position in the compound with another atom such as an oxygen atom, a nitrogen atom, or a sulfur atom.

[0038] Examples of the crosslinking group include a methylene group, an ethylene group, a propylene group, a butylene group, a pentylene group, a hexylene group, a heptylene group, and an octylene group. Examples of the crosslinking group include a divalent oxy group, a thio group, a sulfinyl group, a sulfonyl group, a carbonyl group, a carbonyloxy group, an amino group, an azo group, and an azoxy group.

[0039] A cyclic structure having 6 or more atoms can be introduced, for example, by using 2,2'-(2-vinylanthracene-9,10-diylidene)bis(1,3-dithiole) shown in structural formula (3) or 2-vinylanthraquinone shown in structural formula (4). Note that 2,2'-(2-vinylanthracene-9,10-diylidene)bis(1,3-dithiole) is also called 9,10-bis(1,3-dithiol-2-ylidene)-2-vinylanthracene.

[0040] [ka]

[0041] [ka]

[0042] As described above, the modified olefin-based polymer 1 can be obtained by introducing (bonding) the above-mentioned chemical structure 2 to an unmodified olefin-based polymer (first main chain 3). Therefore, the modified olefin-based polymer 1 can be detected by infrared spectroscopy (IR) depending on the type of chemical structure 2, which is a nucleating agent component, if it is in the state of a simple additive before being added to a resin composition. However, the composition ratio of the modified olefin-based polymer 1 is small and it cannot be detected after the resin composition is produced. In IR, it can be detected by a change in the ratio of the C=C peak to other characteristic peaks in IR. For example, in the case of t-butyl acrylate shown in structural formula (1), the peak of C=O can be mentioned as another characteristic peak. In addition, in the case of 4-tert-butylstyrene shown in structural formula (2), 2,2'-(2-vinyl anthracene-9,10-diylidene) bis(1,3-dithiole) shown in structural formula (3), and 2-vinyl anthraquinone shown in structural formula (4), the peak of the phenyl group can be mentioned.

[0043] As described above, the modified olefin-based polymer 1 according to this embodiment has a chemical structure 2 introduced into the first main chain 3, which promotes the formation of crystal nuclei with other olefin-based polymers that are the main components of the resin composition, and therefore a resin composition having excellent rigidity and toughness can be obtained.

[0044] (Resin composition) Next, the resin composition according to the present embodiment will be described. Note that in the following description, the description of elements that have already been described may be omitted. The resin composition according to the present embodiment includes a modified olefin-based polymer 1. More specifically, the resin composition according to the present embodiment includes the other olefin-based polymer described above as the main component, and the modified olefin-based polymer 1. Since the resin composition according to the present embodiment includes the modified olefin-based polymer 1, it can generate crystal nuclei together with the other olefin-based polymer as the main component. At that time, the number of tie molecules 6, which are molecular chains spanning between the lamellar crystals 5, increases, and the lamellar aggregates are toughened, thereby enhancing the toughness of the resin composition.

[0045] When the total content of the other olefin-based polymer and the modified olefin-based polymer 1, which are the main components, is taken as 100% by mass, the resin composition according to this embodiment preferably contains the other olefin-based polymer in a composition ratio of 85% by mass to 99% by mass and the modified olefin-based polymer 1 in a composition ratio of 1% by mass to 15% by mass. By setting the composition ratio of the resin composition in this way, a resin composition excellent in rigidity and toughness can be obtained more reliably. A method for producing the resin composition according to this embodiment will be described later.

[0046] In addition, the resin composition according to the present embodiment may contain any filler. By containing a filler, a predetermined performance can be improved. For example, when aluminum hydroxide, antimony oxide, magnesium hydroxide, zinc borate, or the like is contained as a filler, flame retardancy is improved. Furthermore, when calcium carbonate, talc, wollastonite, magnesium sulfate, glass fiber, carbon fiber, potassium titanate, or the like is contained as a filler, strength is improved. When titanium oxide, zinc oxide, iron oxide, or the like is contained as a filler, resistance to ultraviolet rays is improved. When carbon black, graphite, carbon fiber, metal powder, metal fiber, metal foil, or the like is contained as a filler, electrical conductivity can be imparted. When mica, graphite, carbon fiber, ferrite, or the like is contained as a filler, vibration damping properties are improved. When Al is contained as a filler, 2 O 3 The inclusion of (alumina), AlN, BN, BeO, etc. improves thermal conductivity. In addition to the filler, the resin composition according to the present embodiment may contain any additives such as a flame retardant, an antioxidant, a dispersant, and an elastomer.

[0047] As described above, the resin composition according to this embodiment contains the modified olefin polymer 1 described above, and therefore has excellent rigidity and toughness.

[0048] (Method of producing modified olefin polymer 1) The method for producing the modified olefin-based polymer 1 according to this embodiment includes a first kneading step for producing the modified olefin-based polymer 1 by kneading an olefin-based polymer that becomes the first main chain 3, a peroxide, and a compound having a chemical structure 2 and a C=C bond that promotes the formation of crystal nuclei with other olefin-based polymers.

[0049] The (unmodified) olefin-based polymer used in the first kneading step may be one of the above-mentioned examples. As described above, the number of carbon atoms in the first main chain 3 is not particularly limited. When the chemical structure 2 does not include a cyclic structure having 6 or more atoms, the chemical structure 2 is preferably a structure in which a side chain having 2 or less carbon atoms is bonded to a main chain (second main chain) having 30 or less carbon atoms (for example, [Chemical formula 1]).

[0050] Peroxides have a peroxide bond (-OO-) in the molecule, and are decomposed by heat, light, reducing substances, etc. to generate free radicals. These free radicals abstract hydrogen from the olefin polymer that was simultaneously added in the first kneading step. The olefin polymer from which hydrogen has been abstracted reacts with the C=C bond of the compound to form a bond. In this manner, a modified olefin polymer 1 according to this embodiment is produced, which has a first main chain 3 (olefin polymer) and a chemical structure 2 that is bonded to the first main chain 3 and promotes the formation of crystal nuclei with other olefin polymers.

[0051] The peroxide is preferably an organic peroxide, such as peroxyketal, dialkyl peroxide, diacyl peroxide, alkyl peroxy ester, peroxycarbonate, or hydroperoxide. The peroxide may be an inorganic peroxide, such as lithium peroxide, potassium peroxide, sodium peroxide, magnesium peroxide, calcium peroxide, barium peroxide, or zinc peroxide. As the peroxide, for example, 2,5-Bis(tert-butylperoxy)-2,5-dimethylhexane can be suitably used.

[0052] The first kneading step can be carried out using a known device used in the production of a resin composition using an olefin-based polymer. A kneader can be used as such a device. The kneader is preferably, for example, a twin-screw kneading extruder. An example of the twin-screw kneading extruder is HYPERKTX-30 manufactured by Kobe Steel, Ltd.

[0053] Examples of the kneading conditions in the first kneading step include, but are not limited to, a maximum cylinder temperature of 200° C., a die temperature of 190° C., a rotation speed of 200 rpm, and a discharge rate of 10 kg / h. The kneading conditions can be changed in various ways depending on the modified olefin polymer 1 to be produced.

[0054] As described above, the present production method can produce the modified olefin polymer 1 which gives a resin composition excellent in rigidity and toughness.

[0055] (Method of producing resin composition) The method for producing a resin composition according to this embodiment includes a first kneading step and a second kneading step. The first kneading step is the same as that described above, so a description thereof will be omitted, and only the second kneading step will be described here.

[0056] The second kneading step is a step of kneading the modified olefin-based polymer 1 produced in the first kneading step with an olefin-based polymer to produce a resin composition. The olefin polymer is the main component constituting the resin composition, and the above-mentioned exemplified ones can be used as in the first kneading step, and the number of carbon atoms is not particularly limited. In addition, in the second kneading step, when the total content of the olefin polymer and the content of the modified olefin polymer 1 is taken as 100 mass%, it is preferable that the composition ratio of the olefin polymer is 85 mass% to 99 mass% and the modified olefin polymer 1 is 1 mass% to 15 mass%. In the second kneading step, any of the fillers and additives described above can be added.

[0057] The second kneading step can be carried out using a known device used in the production of a resin composition using an olefin-based polymer, as in the first kneading step. A kneader can be used as such a device. The kneader is preferably, for example, a twin-screw kneading extruder. An example of the twin-screw kneading extruder is HYPERKTX-30 manufactured by Kobe Steel, Ltd.

[0058] The kneading conditions in the second kneading step are the same as those in the first kneading step, and include, but are not limited to, maximum cylinder temperature: 200°C, die temperature: 190°C, rotation speed: 200 rpm, and discharge rate: 10 kg / h. The kneading conditions can be changed in various ways depending on the resin composition to be produced. By carrying out such a second kneading step, it is possible to increase the number of tie molecules 6, which are molecular chains that span between lamellar crystals 5 when the modified olefin polymer 1 and other olefin polymers generate (bond) crystal nuclei.

[0059] As described above, the method for producing a resin composition according to this embodiment makes it possible to produce a resin composition having excellent rigidity and toughness.

[0060] (Structural parts of machinery and machinery) The structural parts of the mechanical device according to the present embodiment are formed from the resin composition described above. Since the structural parts are formed from the resin composition described above, they have excellent rigidity and toughness. Examples of such structural parts include housings and interior parts of various electrical appliances.

[0061] The mechanical device according to the present embodiment has structural components formed from the resin composition. Since the mechanical device has structural components formed from the resin composition, the mechanical device has excellent rigidity and toughness. Examples of such mechanical devices include various electrical appliances.

[0062] The resin composition according to the present embodiment can be used not only for electrical products, but also for automobile interior materials and daily necessities, for example. EXAMPLES

[0063] Next, the present invention will be described in more detail with reference to examples and comparative examples. Table 1 shows the product names and manufacturers of the raw materials used in the studies of the examples and comparative examples.

[0064] [Table 1]

[0065] The raw materials shown in Table 1 were then fed into a kneader in the composition ratios (mass%) shown in Table 2, and the first kneading step was carried out to produce modified olefin-based polymers (modified polymer B) according to Examples 1 to 9. In addition, "-" in Table 2 indicates that no additive was added. In other words, in Comparative Examples 1 and 2, the first kneading step was not carried out, and modified polymer B was not produced. The kneader used was a twin-screw kneading extruder, HYPERKTX-30, manufactured by Kobe Steel, Ltd. The kneading conditions were as follows: maximum cylinder temperature: 200° C., die temperature: 190° C., rotation speed: 200 rpm, and discharge rate: 10 kg / h.

[0066] [Table 2]

[0067] Next, as shown in Table 3, the modified polymer B according to Examples 1 to 9, the olefin-based polymer (polymer C), and optionally the compound A, the compound C, and aluminum hydroxide were put into a kneader, and a second kneading step was carried out to produce the resin compositions according to Examples 1 to 9 and Comparative Examples 1 and 2. As in the first kneading process, a twin-screw kneading extruder, HYPERKTX-30 manufactured by Kobe Steel, Ltd., was used as the kneading machine. The kneading conditions were the same as those in the first kneading step, with maximum cylinder temperature: 200°C, die temperature: 190°C, rotation speed: 200 rpm, and discharge rate: 10 kg / h.

[0068] [Table 3]

[0069] The toughness and rigidity of the resin compositions according to Examples 1 to 9 and Comparative Examples 1 and 2 were measured and evaluated as follows.

[0070] (Toughness) For each resin composition, a Charpy impact test was performed in accordance with JIS K 7111-1:2012 to evaluate toughness. The shape of the test piece was also in accordance with JIS K 7111-1:2012, and a notched impact test piece was directly prepared by injection molding. The impact test piece had a length of 80±2 mm, a width of 10.0±0.2 mm, a thickness of 4.0±0.2 mm, and a notch width of 8.0±0.2 mm. The test was performed at room temperature, both for the sample and the measurement temperature.

[0071] When the polymer was PP, the toughness was evaluated from the obtained Charpy impact strength as follows. Not possible (×): 11kJ / m 2 less than Possible (△):11kJ / m 2 More than 13kJ / m 2 less than Good (○):13kJ / m 2 More than 17kJ / m 2 less than Excellent (◎): 17kJ / m 2 End

[0072] When the polymer was PE, the toughness was evaluated from the obtained Charpy impact strength as follows. Not possible (×): 7kJ / m 2 less than Possible (△):7kJ / m 2 More than 9kJ / m 2 less than Good (○): 9kJ / m 2 More than 12kJ / m 2 less than Excellent (◎): 12kJ / m 2 End

[0073] (rigidity) For each resin composition, the flexural modulus was measured in accordance with JIS K 7171:2016 (ISO 178:2010, Amd.1:2013) to evaluate rigidity. The shape of the test piece was also in accordance with JIS K 7171:2016, and a bending test piece was directly prepared by injection molding. The bending test piece had a length of 80±2 mm, a width of 10.0±0.2 mm, and a thickness of 4.0±0.2 mm. The test speed was 2 mm / min in accordance with JIS K 7171:2016, and the flexural modulus was calculated from the obtained results.

[0074] The rigidity was evaluated based on the obtained flexural modulus as follows: The rigidity was evaluated based on the same criteria regardless of the type of polymer. Not acceptable (×): Less than 0.8 GPa Acceptable (△): 0.8GPa or more and less than 1.0GPa Good (○): 1.0GPa or more and less than 1.4GPa Excellent (◎): 1.4GPa or more

[0075] The evaluation results of the toughness and rigidity of the resin compositions according to Examples 1 to 9 and Comparative Examples 1 and 2 are shown in Table 4.

[0076] [Table 4]

[0077] As shown in Table 4, the resin compositions according to Examples 1 to 9 all contained a modified olefin polymer (modified polymer B) having a chemical structure that promotes the formation of crystal nuclei with another olefin polymer (polymer C) as the main component. Therefore, it was presumed that the resin compositions according to Examples 1 to 9 were able to increase the number of tie molecules, which are molecular chains spanning between lamellar crystals, and thus had excellent rigidity and toughness. Among these, it was presumed that in Examples 1 and 4, the compounds A and D used had higher dispersibility in the olefin polymer and crystallization promotion ability than compounds B and C, and thus had a higher probability of tie molecule formation, so that more tie molecules were formed and the toughness was improved. Example 9 contained aluminum hydroxide as a filler to improve flame retardancy, and it was confirmed that this resulted in excellent toughness and rigidity. In addition, in Examples 6 and 8, the amount of modified polymer B added was outside the preferred range, so that the toughness was slightly lower than in other Examples, but there was no problem in practical use. The reason for the results of Examples 6 and 8 was considered as follows. There is a possibility that the modified polymer B itself was oxidized by peroxide and cut, resulting in a lower molecular weight. Therefore, it is believed that the toughness was low in Example 6 because the amount of modified polymer B added was too large and outside the preferred range, whereas in Example 8, the amount of modified polymer B added was too small and outside the preferred range, which reduced the effect of increasing tie molecules and therefore reduced toughness.

[0078] Compound A (t-Butyl Acrylate) and compound C (2,2'-(2-Vinylanthracene-9,10-diylidene)bis(1,3-dithiole)) partially have a structure used in a crystal nucleating agent. However, the resin compositions according to Comparative Examples 1 and 2 are merely obtained by adding compound A (t-Butyl Acrylate) or compound C (2,2'-(2-Vinylanthracene-9,10-diylidene)bis(1,3-dithiole)) to an olefin-based polymer. Therefore, it was presumed that the resin compositions according to Comparative Examples 1 and 2 were unable to increase the number of tie molecules, which are molecular chains that span between lamellar crystals, and therefore did not improve toughness.

[0079] The modified olefin-based polymer, resin composition, method for producing the modified olefin-based polymer, method for producing the resin composition, structural parts of the mechanical device, and mechanical device according to the present invention have been described above by way of embodiments and examples, but these have been described in detail to easily explain the present invention, and are not necessarily limited to those having all of the configurations described. In addition, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. In addition, it is possible to add, delete, or replace a part of the configuration of each embodiment with another configuration. [Explanation of symbols]

[0080] 1 Modified olefin polymer (polymer) 2 Chemical structure 3. First main chain 4. Crystal structure 5 Lamellar crystals 6. Thai Molecules

Claims

1. A polymer comprising a first backbone which is polypropylene or polyethylene; a chemical structure bonded to the first main chain that promotes the formation of crystal nuclei with other olefin-based polymers; having the other olefin-based polymer is polypropylene or polyethylene, The modified olefin-based polymer, wherein the chemical structure is an anthracene derivative structure.

2. A resin composition comprising the modified olefin-based polymer according to claim 1.

3. The resin composition according to claim 2, wherein the olefin-based polymer is contained in an amount of 85% by mass to 99% by mass and the modified olefin-based polymer is contained in an amount of 1% by mass to 15% by mass, when the total content of the olefin-based polymer and the modified olefin-based polymer is taken as 100% by mass.

4. The method includes a first kneading step of kneading an olefin-based polymer serving as a first main chain with a peroxide and a compound having a chemical structure and a C=C bond that promotes the formation of crystal nuclei with other olefin-based polymers to produce a modified olefin-based polymer, the olefin-based polymer forming the first main chain is polypropylene or polyethylene; the other olefin-based polymer is polypropylene or polyethylene, The method for producing a modified olefin polymer, wherein the chemical structure is an anthracene derivative structure.

5. a first kneading step for producing a modified olefin polymer by kneading an olefin polymer to be a first main chain, a peroxide, and a compound having a chemical structure and a C=C bond that promotes the formation of crystal nuclei with other olefin polymers; A second kneading step of kneading the modified olefin-based polymer and an olefin-based polymer to produce a resin composition; Including, the olefin-based polymer forming the first main chain is polypropylene or polyethylene; the other olefin-based polymer is polypropylene or polyethylene, The method for producing a resin composition, wherein the chemical structure is a derivative structure of anthracene.

6. A structural part of a mechanical device, formed from the resin composition according to claim 2 or 3.

7. A mechanical device having a structural part formed from the resin composition according to claim 2 or 3.

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