Resin composition and molded article containing the same

Abstract

The present invention aims to provide a resin composition that can produce a molded article that is lightweight and has a high heat distortion temperature, and a molded article that achieves both lightness and a high heat distortion temperature. [Solution] A resin composition comprising polymer (A) that satisfies the following requirements (AI) and (A-II), and polymer (B) that satisfies the following requirement (BI). (AI): The density of polymer (A) is 0.90 g / cm³ 3 It is less than. (A-II): The melting point of polymer (A), as measured by differential scanning calorimeter, is less than 240°C. (BI): The glass transition temperature of polymer (B), measured by differential scanning calorimeter, is 70°C or higher.

Description

Technical Field

[0001] The present invention relates to a resin composition and a molded article containing the resin composition.

Background Art

[0002] In recent years, various articles around us are manufactured by molding resins or resin compositions. Among these articles, depending on the application, there are cases where light weight is required. In particular, in wearable members such as spectacle members and head-mounted display members, resins with excellent light weight are preferably used because of the characteristic of being worn and used on the body.

[0003] Examples of such resins with excellent light weight include 4-methyl-1-pentene polymers. 4-Methyl-1-pentene polymers not only have excellent light weight but also have excellent characteristics such as transparency, steam resistance, mold release property, gas permeability, and electrical properties. Therefore, they are used in various fields such as food containers, auxiliary materials for electronic and information members, laboratory equipment, stationery, engineering members for crosslinking, release films, films for electronic and information members, food packaging materials, and synthetic paper.

[0004] However, there was room for improvement in 4-methyl-1-pentene polymers from the viewpoint of further increasing the heat distortion temperature. In Patent Document 1, a resin composition containing a 4-methyl-1-pentene copolymer, a predetermined ethylene copolymer, and glass fiber in a predetermined blending ratio is disclosed as a resin composition having a high heat distortion temperature.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The resin composition described in Patent Document 1 achieved a high heat distortion temperature, but because it contained a certain amount of glass fibers, which have a higher density than 4-methyl-1-pentene polymers, there was room for improvement in terms of lightness. Therefore, there was a need for a resin composition that could achieve both lightness and a high heat distortion temperature.

[0007] The present invention aims to provide a resin composition that can produce a molded article that is lightweight and has a high heat distortion temperature, and a molded article that achieves both lightness and a high heat distortion temperature. [Means for solving the problem]

[0008] The present invention relates, for example, to the following matters [1] to

[11] . [1] A polymer (A) that satisfies the following requirements (AI) and (A-II), A polymer (B) that satisfies the following requirements (BI) and A resin composition containing the following: (AI): The density of polymer (A) is 0.90 g / cm³ 3 It is less than. (A-II): The melting point of polymer (A), as measured by differential scanning calorimeter, is less than 240°C. (BI): The glass transition temperature of polymer (B), measured by differential scanning calorimeter, is 70°C or higher.

[0009] [2] The composition according to [1], wherein the glass transition temperature of the polymer (B), as measured by differential scanning calorimeter, is less than 170°C. [3] The resin composition according to [1] or [2], wherein the polymer (A) contains 50.0 to 100 mol% of structural units derived from 4-methyl-1-pentene and 0 to 50.0 mol% of structural units derived from α-olefins having 2 to 20 carbon atoms (excluding 4-methyl-1-pentene).

[0010] [4] The polymer (B) is A structural unit (B1) derived from an α-olefin having 2 to 20 carbon atoms, and a structural unit (B2) derived from a cyclic olefin having no aromatic ring, and having, the resin composition according to any one of [1] to [3], wherein the cyclic olefin having no aromatic ring contains a compound represented by the following formula (b2).

Chemical formula

[0011] 〔5〕 The resin composition according to any one of [1] to [4], wherein the density of the polymer (B) is 1.10 g / cm 3 or less. 〔6〕 When the total of the polymer (A) and the polymer (B) in the resin composition is 100% by mass, the content of the polymer (A) is 55 to 95% by mass, and the content of the polymer (B) is 5 to 45% by mass. The resin composition according to any one of [1] to [5].

[0012] 〔7〕 The resin composition according to any one of [1] to [6], having a density of less than 0.90 g / cm 3 . 〔8〕 The melt flow rate of polymer (A), measured at 260°C and a 5kg load, was 1 to 500g / 10min. A resin composition according to any one of [1] to [7], wherein the melt flow rate of the polymer (B), measured at 260°C and a 2.16 kg load, is 1 to 100 g / 10 min.

[0013] [9] A molded article comprising the resin composition described in any of [1] to [8].

[10] The molded article according to [9], which is an injection-molded article of any of the resin compositions described in [1] to [8].

[11] A method for manufacturing a molded article, comprising the step of injection molding a resin composition described in any of [1] to [8]. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a resin composition that can produce a molded article that is lightweight and has a high heat distortion temperature, as well as a molded article that achieves both lightness and a high heat distortion temperature. [Modes for carrying out the invention]

[0015] The present invention will be described in detail below. In this specification, numerical ranges indicated using "~" include the values ​​indicated before and after them as the lower and upper limits, respectively. The various monomers in this invention may be derived from fossil raw materials, from biological sources such as biomass, from chemical recycling, or from mixtures thereof.

[0016] 《Resin composition》 The resin composition of the present invention is a resin composition comprising polymer (A) and polymer (B). <Polymer (A)> First, let me describe the polymer (A) according to the present invention. Polymer (A) is a polymer that satisfies the following requirements (AI) and (A-II). (AI): The density of polymer (A) is 0.90 g / cm³ 3 It is less than. (A-II): The melting point (Tm) of polymer (A), as measured by differential scanning calorimeter (DSC), is less than 240°C. Polymer (A) may contain only one type of polymer or may contain two or more types of polymers. If polymer (A) contains two or more types of polymers, each polymer satisfies the above requirements (AI) and (A-II).

[0017] The density of polymer (A) is 0.90 g / cm³. 3 If the density exceeds the above, the lightweight properties of the molded article containing the resin composition of the present invention may be impaired. The density of polymer (A) is preferably 0.88 g / cm³ from the viewpoint of lightweight properties. 3 The following, and more preferably 0.85 g / cm³ 3 The following applies: There is no particular lower limit to the density of polymer (A), but for example, 0.50 g / cm³ 3 This can be done.

[0018] Polymer (A) satisfies the above requirement (A-II) and has a melting point of less than 240°C. If the melting point of polymer (A) is 240°C or higher, the moldability of the resin composition of the present invention and the impact resistance of the molded article containing the resin composition of the present invention may be impaired. From the viewpoint of achieving both moldability and impact resistance, the melting point of polymer (A) is preferably 200°C or higher and less than 240°C, more preferably 200°C or higher and less than 238°C, even more preferably 210 to 235°C, and particularly preferably 220 to 235°C.

[0019] The melt flow rate (MFR) of polymer (A), measured at 260°C and a 5kg load, is preferably 1 to 500 g / 10 min, more preferably 3 to 100 g / 10 min, even more preferably 5 to 50 g / 10 min, and particularly preferably 10 g / 10 min or more and less than 30 g / 10 min. When the MFR of polymer (A) is within the above range, the impact resistance of the molded article containing the resin composition of the present invention is good.

[0020] Polymer (A) is preferably a polymer containing a structural unit derived from 4-methyl-1-pentene (4-methyl-1-pentene-based polymer) due to its excellent lightness, and more preferably contains 50.0 to 100 mol% of structural units derived from 4-methyl-1-pentene (hereinafter also referred to as structural unit (i)) and 0 to 50.0 mol% of structural units derived from α-olefins having 2 to 20 carbon atoms (excluding 4-methyl-1-pentene) (hereinafter also referred to as structural unit (ii)). The following explanation assumes the use of a 4-methyl-1-pentene polymer as polymer (A), but polymer (A) is not limited to a 4-methyl-1-pentene polymer.

[0021] The 4-methyl-1-pentene polymer that can be used as polymer (A) may be a 4-methyl-1-pentene homopolymer, a copolymer of 4-methyl-1-pentene and another polymerizable compound (4-methyl-1-pentene copolymer), or may contain both a 4-methyl-1-pentene homopolymer and a 4-methyl-1-pentene copolymer.

[0022] The content of the constituent unit (i) in polymer (A) is preferably 50.0 to 100 mol%, more preferably 50.0 to 99.5 mol%, even more preferably 70.0 to 99.0 mol%, and particularly preferably 85.0 to 98.5 mol%. The content of the constituent unit (ii) in polymer (A) is preferably 0 to 50.0 mol%, more preferably 0.5 to 50.0 mol%, even more preferably 1.0 to 30.0 mol%, and particularly preferably 1.5 to 15.0 mol%. When the content of constituent units (i) and (ii) in polymer (A) is within the above range, the moldability of the resin composition is good, and the heat resistance of the molded article obtained from the resin composition of the present invention is good.

[0023] The α-olefin that leads to the aforementioned structural unit (ii) can be a linear α-olefin. Examples of α-olefins that lead to the aforementioned structural unit (ii) include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-undecene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-eicosene, and the like.

[0024] Among these, linear α-olefins having 6 to 18 carbon atoms are preferred from the viewpoint of heat resistance, and linear α-olefins having 10 to 18 carbon atoms are more preferred. Specifically, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-heptadecene, 1-octadecene, etc. are preferred, and among these, 1-decene, 1-hexadecene, and 1-octadecene are particularly preferred.

[0025] The aforementioned constituent unit (ii) may be derived from only one selected from the group consisting of α-olefins having 2 to 20 carbon atoms, or it may be derived from two or more selected from the group consisting of α-olefins having 2 to 20 carbon atoms.

[0026] Polymer (A) may further have constituent units derived from other polymerizable compounds other than 4-methyl-1-pentene and α-olefins having 2 to 20 carbon atoms, to the extent that it does not impair the objectives of the present invention. Other polymerizable compounds include, for example, vinyl compounds having a cyclic structure such as styrene, vinylcyclopentene, vinylcyclohexane, vinylnorbornane; vinyl esters such as vinyl acetate; unsaturated organic acids or derivatives thereof such as maleic anhydride; conjugated dienes such as butadiene, isoprene, pentadiene, 2,3-dimethylbutadiene; 1,4-hexadiene, 1,6-octadiene, 2-methyl-1,5-hexadiene, 6-methyl-1,5-heptadiene, 7-methyl-1,6-octadiene, Examples of non-conjugated polyenes include dicyclopentadiene, cyclohexadiene, dicyclooctadiene, methylenenorbornene, 5-vinylnorbornene, 5-ethylidene-2-norbornene, 5-methylene-2-norbornene, 5-isopropylidene-2-norbornene, 6-chloromethyl-5-isopropene-2-norbornene, 2,3-diisopropylidene-5-norbornene, 2-ethylidene-3-isopropylidene-5-norbornene, and 2-propenyl-2,2-norbornadiene.

[0027] In polymer (A), the proportion of constituent units derived from other polymerizable compounds is usually 10 mol% or less, preferably 5 mol% or less, and more preferably 3 mol% or less, out of 100 mol% of all constituent units of polymer (A).

[0028] When a 4-methyl-1-pentene polymer is used as polymer (A), examples of olefin polymerization catalysts that can be used in the production of the 4-methyl-1-pentene polymer include Ziegler-Natta catalysts and metallocene catalysts. Preferred Ziegler-Natta catalysts include the solid titanium catalyst component [A-9] described in International Publication No. 2006 / 054613. Furthermore, preferred metallocene catalysts include those described in International Publication No. 01 / 53369, International Publication No. 01 / 27124, Japanese Patent Publication No. 3-193796, Japanese Patent Publication No. 02-41303, International Publication No. 06 / 025540, or International Publication No. 2014 / 123212. Furthermore, polymer (A) can also be obtained by polymerizing polymerizable monomers such as 4-methyl-1-pentene, which form the constituent units of polymer (A), based on the method described in International Publication No. 2004 / 87775.

[0029] <Polymer (B)> Next, polymer (B) according to the present invention will be described. Polymer (B) is a polymer that satisfies the following requirement (BI). (BI): The glass transition temperature (Tg) of polymer (B), as measured by differential scanning calorimeter (DSC), is 70°C or higher. Polymer (B) may contain only one type of polymer or may contain two or more types of polymers. If polymer (B) contains two or more types of polymers, each polymer satisfies the above requirement (BI).

[0030] If the glass transition temperature of polymer (B) is less than 70°C, the effect of improving the heat distortion temperature of the molded article obtained from the resin composition of the present invention may not be obtained. The glass transition temperature of polymer (B) is preferably 85°C or higher, more preferably 100°C or higher, and even more preferably 120°C or higher. From the viewpoint of moldability, the glass transition temperature of polymer (B) is preferably less than 170°C, more preferably 160°C or lower, and even more preferably 150°C or lower.

[0031] The polymer (B) according to the present invention is preferably, The constituent unit (B1) derived from α-olefins with 2 to 20 carbon atoms, A constituent unit (B2) derived from a cyclic olefin that does not have an aromatic ring, It has, The aforementioned cyclic olefin lacking an aromatic ring includes the compound represented by the following formula (b2).

[0032] [ka] (In the above equation (b2), n is 0 or 1, m is 0 or a positive integer, q is 0 or 1, R 1 ~R 18 Furthermore, R a and R b Each is independently a hydrogen atom, a halogen atom, or a hydrocarbon group which may be substituted with a halogen atom, and R 15 ~R 18 They may be bonded to each other to form a monocycle or polycycle, and the monocycle or polycycle may have a double bond, and R 15 and R 16 And, or R 17 and R 18 They may form alkylidene groups. However, they do not contain aromatic rings.

[0033] The following describes each constituent unit of polymer (B). (Component unit (B1)) The constituent unit (B1) is a constituent unit derived from α-olefins with 2 to 20 carbon atoms. Here, the α-olefins having 2 to 20 carbon atoms may be linear or branched, and examples include linear α-olefins having 2 to 20 carbon atoms such as ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, and 1-eicosene; and branched α-olefins having 4 to 20 carbon atoms such as 3-methyl-1-butene, 3-methyl-1-pentene, 3-ethyl-1-pentene, 4-methyl-1-pentene, 4-methyl-1-hexene, 4,4-dimethyl-1-hexene, 4,4-dimethyl-1-pentene, 4-ethyl-1-hexene, and 3-ethyl-1-hexene. Among these, linear α-olefins having 2 to 4 carbon atoms are preferred, and ethylene is particularly preferred. Such linear or branched α-olefins can be used individually or in combination of two or more.

[0034] (Component unit (B2)) The constituent unit (B2) is a constituent unit derived from a cyclic olefin that does not have an aromatic ring, and it is preferable that the cyclic olefin that does not have an aromatic ring contains a compound represented by the following formula (b2). The cyclic olefin that does not have an aromatic ring may be used alone or in combination of two or more types.

[0035] [ka]

[0036] In the above equation (b2), n is 0 or 1, m is 0 or a positive integer, q is 0 or 1, and R 1 ~R 18 Furthermore, R a and R b Each is independently a hydrogen atom, a halogen atom, or a hydrocarbon group which may be substituted with a halogen atom, and R 15 ~R 18 They may be bonded to each other to form a monocycle or polycycle, and the monocycle or polycycle may have a double bond, and R 15 and R 16And, or R 17 and R 18 They may form an alkylidene group. However, they do not contain an aromatic ring. Note that "not containing an aromatic ring" means that the compound represented by formula (b2) above does not contain an aromatic ring in its structure.

[0037] Preferably, in formula (b2) above, n is 0 or 1, m is 0 or a positive integer, n+m is an integer of 1 or more, q is 0 or 1, and R 1 ~R 18 Furthermore, R a and R b Each is independently a hydrogen atom, a halogen atom, or a hydrocarbon group which may be substituted with a halogen atom, and R 15 ~R 18 They may be bonded to each other to form a monocycle or polycycle, and the monocycle or polycycle may have a double bond, and R 15 and R 16 And, or R 17 and R 18 They may form alkylidene groups, but without aromatic rings.

[0038] The constituent units (B2) include the constituent units derived from bicyclo[2.2.1]-2-heptene and tetracyclo[4.4.0.1 2,5 .1 7,10 ]-3-dodecene-derived constituent units and hexacyclo[6,6,1,1 3,6 ,1 10,13 ,0 2,7 ,0 9,14 Examples include constituent units derived from heptadecene-4, and tetracyclo[4.4.0.1 2,5 .1 7,10 ]-3-dodecene-derived constituent units and hexacyclo[6,6,1,1 3,6 ,1 10,13 ,0 2,7 ,0 9,14 Preferably, it contains at least one constituent unit selected from constituent units derived from heptadecene-4, and tetracyclo[4.4.0.1 2,5 .1 7,10It is more preferable to include a constituent unit derived from ]-3-dodecene.

[0039] In other words, the compound represented by formula (b2) above is bicyclo[2.2.1]-2-heptene (hereinafter also referred to as norbornene), tetracyclo[4.4.0.1 2,5 .1 7,10 ]-3-dodecene (hereinafter also referred to as tetracyclododecene) and hexacyclo[6,6,1,1 3,6 ,1 10,13 ,0 2,7 ,0 9,14 Examples include heptadecene-4, tetracyclododecene and hexacyclo[6,6,1,1 3,6 ,1 10,13 ,0 2,7 ,0 9,14 It is preferable to include at least one compound selected from heptadecene-4, and more preferably to include tetracyclododecene.

[0040] The copolymerization type of polymer (B) is not particularly limited, but examples include random copolymers and block copolymers. In this embodiment, polymer (B) is preferably a random copolymer.

[0041] The density of polymer (B) is preferably 1.10 g / cm³ from the viewpoint of the lightweight nature of the molded article containing the resin composition of the invention. 3 The following, and more preferably 1.08 g / cm³ 3 The following, and more preferably 1.06 g / cm³ 3 The following applies: There is no particular lower limit to the density of polymer (B), but for example, 0.90 g / cm³. 3 This can be done.

[0042] The melt flow rate (MFR) of polymer (B), measured at 260°C and a 2.16 kg load, is preferably 1 to 100 g / 10 min, more preferably 3 to 50 g / 10 min, and more preferably 5 to 30 g / 10 min. When the MFR of polymer (B) is within the above range, the impact resistance of the molded article containing the resin composition of the present invention is good.

[0043] Polymer (B) is not particularly limited as long as it satisfies the above requirement (BI), and may, for example, be a crystalline ring-opening polymer of a cyclic olefin monomer, an amorphous ring-opening polymer of a cyclic olefin monomer, or an amorphous addition polymer of a cyclic olefin with another monomer. In particular, it is a preferred embodiment that polymer (B) is an amorphous addition polymer of a cyclic olefin monomer with another monomer and does not exhibit a melting point on a differential scanning calorimeter (DSC).

[0044] Polymer (B) can be produced by selecting appropriate conditions according to the methods described in, for example, Japanese Patent Publication No. 60-168708, Japanese Patent Publication No. 61-120816, Japanese Patent Publication No. 61-115912, Japanese Patent Publication No. 61-115916, Japanese Patent Publication No. 61-271308, Japanese Patent Publication No. 61-272216, Japanese Patent Publication No. 62-252406, Japanese Patent Publication No. 62-252407, Japanese Patent Publication No. 2007-314806, Japanese Patent Publication No. 2010-241932, etc.

[0045] <Other polymer components> The resin composition of the present invention may further contain other resin components other than polymer (A) and polymer (B). Examples of other resin components include 4-methyl-1-pentene polymers other than polymer (A), known thermoplastic resins and thermosetting resins, and cyclic olefin polymers other than polymer (B) (for example, ring-opening polymers of cyclic olefins and their hydrides). The resin composition of the present invention may contain one or more other resin components.

[0046] If the resin composition of the present invention contains resin components other than polymer (A) and polymer (B), the content of these resin components is usually 3.0 parts by mass or less, preferably 2.0 parts by mass or less, and more preferably 1.0 part by mass or less, when the total content of polymer (A) and polymer (B) is 100 parts by mass.

[0047] <Additives> The resin composition of the present invention may contain conventionally known additives. Examples of additives include secondary antioxidants, heat stabilizers, weather stabilizers, antistatic agents, slip agents, antiblocking agents, antifogging agents, lubricants, dyes, pigments, natural oils, synthetic oils, waxes, fillers, and hydrochloric acid absorbents. The content of additives is not particularly limited, but if the total of polymer (A) and polymer (B) is 100 parts by mass, then each is usually 0 to 50 parts by mass, preferably 0 to 10 parts by mass. The resin composition of the present invention may contain one or more additives.

[0048] <Resin composition> The resin composition of the present invention comprises the above polymer (A) and polymer (B). The resin composition of the present invention may contain the above polymer (A) and polymer (B), and is not limited to their respective content ratios. However, in one embodiment, when the total amount of polymer (A) and polymer (B) in the resin composition is 100% by mass, The content of the polymer (A) is 55 to 95% by mass, The content of the polymer (B) is preferably 5 to 45% by mass. When the content of polymer (A) and polymer (B) are within the above ranges, the effect of improving the heat distortion temperature while maintaining lightness is further enhanced.

[0049] The content of polymer (A) is more preferably 60 to 85% by mass, and even more preferably 65 to 75% by mass. The content of polymer (B) is more preferably 15 to 40% by mass, and even more preferably 25 to 35% by mass. In particular, when the content of polymer (A) is 65-75% by mass and the content of polymer (B) is 25-35% by mass, it is especially preferable because it provides the effect of improving the heat distortion temperature while maintaining lightness, as well as improving impact resistance.

[0050] From the viewpoint of the lightweight nature of the molded article containing the resin composition, the density of the resin composition of the present invention is preferably 0.90 g / cm³.3 Less than or equal to, and more preferably 0.89 g / cm³ 3 The following, and more preferably 0.88 g / cm³ 3 The following applies: The lower limit of the density of the resin composition of the present invention is not particularly limited, but for example, 0.50 g / cm³ 3 This can be done.

[0051] Method for manufacturing resin compositions The resin composition of the present invention can be obtained, for example, by mixing polymer (A) and polymer (B) with other resin components and additives as needed.

[0052] Regarding the mixing method of each component, various known methods can be employed, such as mixing each component using equipment such as a plast mill, Henschel mixer, V-blender, ribbon blender, tumbler, blender, or kneader-ruder; or, after the mixing, the resulting mixture can be further melt-kneaded using equipment such as a single-screw extruder, twin-screw extruder, kneader, or Banbury mixer, and the resulting melt-kneaded product can be granulated or pulverized.

[0053] Molded body The molded article of the present invention is a molded article containing the resin composition of the present invention, and preferably a molded article obtained by molding the resin composition of the present invention by a conventionally known molding method. The shape of the molded article is not particularly limited and can be appropriately selected depending on the application. The molded articles of the present invention can be used in a variety of applications without limitation. Because the molded articles of the present invention are lightweight, have a high thermal distortion temperature, and offer excellent safety, they can be suitably used in applications such as films, sheets, wearable components, bottle caps, and grip materials. Wearable components refer to components that come into close contact with the body, such as eyeglass components, earpieces, watch straps, and hats.

[0054] The method for manufacturing the molded article of the present invention (molding method) is not particularly limited, and conventionally known manufacturing methods can be used, for example. Examples of preferred manufacturing methods include injection molding, extrusion sheet molding, compression molding, filament spinning, and molten extrusion lamination by 3D printer, extrusion molding, calendering, press molding, vacuum forming, pressure forming, and vacuum pressure forming.

[0055] One exemplary and preferred embodiment of the present invention is injection molding. That is, the molded article of the present invention is preferably an injection-molded article of the resin composition of the present invention. Here, an injection-molded article means a molded article obtained by injection molding the resin composition of the present invention. In a preferred embodiment of the present invention, the method for manufacturing the molded article of the present invention includes a step of injection molding the resin composition of the present invention. By processing the resin composition of the present invention by injection molding, it is possible to suitably obtain the molded article of this embodiment containing the resin composition of the present invention. However, the molded article of the present invention is not limited to an injection-molded article.

[0056] Applications of molded and injection-molded products Examples of applications for the molded and injection-molded articles of the present invention include automotive materials, clothing materials, sanitary materials, construction materials, shoe materials, sports equipment materials, leisure equipment materials, industrial materials, food packaging materials, daily necessities, and wearable components. Examples of daily necessities include smartphone cases, game console cases, food containers, tableware, cutlery, toothbrushes, stationery, and furniture.

[0057] Applications of wearable components Wearable components refer to components that come into close contact with the body. Specific applications of wearable components, including the resin composition, molded articles, or injection-molded articles of the present invention, include hats and headbands that come into close contact with the head, eyeglass components (including so-called smart glasses) that come into close contact with the face, headset components, head-mounted display components, earpieces, earphone components, headphone components that come into close contact with the ears, mask strings, mouthpieces that come into contact with the mouth, pacifiers, neck wearable components that come into close contact with the neck, watch bands, watch components that come into close contact with the arms, bracelets, innerwear, underwear, bras that come into close contact with the upper and lower body, insoles that come into close contact with the feet, socks, and the like. In addition to these, cushions, bedding, pillows, and other components that are expected to come into close contact with the body also fall within the scope of wearable component applications. [Examples]

[0058] The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples. The various physical properties of the polymer were measured by the following method.

[0059] [Intrinsic viscosity [η]] The intrinsic viscosity [η] of polymers (A-1) and (A-2) was measured using an Ubbelohde viscometer in decalin solvent at 135°C. Specifically, approximately 20 mg of powdered polymer (A-1) or (A-2) was dissolved in 25 mL of decalin, and the specific viscosity ηsp was measured in an oil bath at 135°C using an Ubbelohde viscometer. After diluting this decalin solution by adding 5 mL of decalin, the specific viscosity ηsp was measured in the same manner as above. This dilution procedure was repeated two more times, and the intrinsic viscosity [η] (unit: dl / g) was determined by extrapolating the concentration (C) to 0 as ηsp / C (see Equation 1 below). [η]=lim(ηsp / C) (C→0) (Equation 1)

[0060] [Melting point (Tm), glass transition temperature (Tg)] Using a DSC measuring device (model number: DSC7000C) manufactured by Seiko Instruments Inc., approximately 5 mg of the sample was packed into an aluminum measuring pan and heated to 280°C at a rate of 10°C / min. After holding at 280°C for 5 minutes, the temperature was lowered to 20°C at a rate of 10°C / min. After holding at 20°C for 5 minutes, the temperature was raised to 280°C at a rate of 10°C / min. From the DSC curves observed during the second heating cycle, the melting points (Tm) of polymers (A-1) and (A-2), and the glass transition temperature (Tg) of polymer (B-1) were obtained.

[0061] 〔composition〕 The content (mol%) of the constituent units derived from 4-methyl-1-pentene and the comonomer in polymers (A-1) and (A-2) is as follows: 13 The measurement was performed by 13C-NMR. The measurement conditions were as follows: • Measurement conditions Measurement equipment: Nuclear magnetic resonance spectrometer (ECP500 model, manufactured by JEOL Ltd.) Observation nucleus: 13 C(125MHz) Sequence: Single-pulse proton decoupling Pulse width: 4.7 μs (45° pulse) Repeat time: 5.5 seconds Total number of times: 10,000 or more Solvent: Orthodichlorobenzene / deuterated benzene (volume ratio: 80 / 20) mixed solvent Sample concentration: 55 mg / 0.6 mL Measurement temperature: 120℃ Chemical shift baseline: 27.50 ppm

[0062] [Melt Flow Rate (MFR)] The melt flow rate (MFR) of polymers (A-1) and (A-2) was measured at 260°C under a 5 kg load, in accordance with ASTM D1238. The unit is g / 10 min. The melt flow rate (MFR) of polymer (B-1) was measured in accordance with ASTM D1238 at 260°C under a load of 2.16 kg. The unit is g / 10 min.

[0063] 〔density〕 The densities of polymers (A-1), (A-2), and (B-1) were measured using the density gradient tube method in accordance with ASTM D792.

[0064] [Manufacturing Example 1] (Manufacturing of polymer (A-1)) In Comparative Example 7 of International Publication No. 2006 / 054613, a 4-methyl-1-pentene / 1-decene copolymer was obtained by changing the amount of monomer charged so that the content of the constituent units derived from 4-methyl-1-pentene and 1-decene in the resulting copolymer was as shown in Table 1 below. This was kneaded to the values ​​shown in Table 1 for the intrinsic viscosity and MFR, and then pelletized to obtain polymer (A-1), which is a 4-methyl-1-pentene / 1-decene copolymer. The composition, melting point, and density of the obtained polymer (A-1) were measured using the measurement method described above. The results are shown in Table 1.

[0065] [Manufacturing Example 2] (Manufacturing of Polymer (A-2)) A 4-methyl-1-pentene polymer was obtained in the same manner as in Example 2B of International Publication No. 2014 / 050817. This polymer was kneaded to the values ​​shown in Table 1 for its intrinsic viscosity and MFR, and then pelletized to obtain polymer (A-2), which is a homopolymer of 4-methyl-1-pentene. The composition, melting point, and density of the obtained polymer (A-2) were measured using the measurement method described above. The results are shown in Table 1.

[0066] [Table 1]

[0067] [Manufacturing Example 3] (Manufacturing of Polymer (B-1)) <Preparation of catalyst> Ethyl aluminum sesquichloride (Al(C2H5) 1.5 Cl 1.5 The solution was diluted with cyclohexane to prepare an organoaluminum compound catalyst solution.

[0068] <Polymerization> In a stirred polymerizer, the organoaluminum compound catalyst solution prepared by the above method is used as a catalyst to polymerize ethylene and tetracyclo[4.4.0.1 2,5 .1 7,10 A copolymerization reaction of ]-3-dodecene was carried out to obtain a copolymer solution. Here, ethylene was supplied into the polymerizer along with hydrogen gas.

[0069] <Decalcification> Water and an aqueous sodium hydroxide solution were added to the obtained copolymer solution to stop the polymerization reaction and remove the catalyst residue present in the copolymer solution (decalcification). Pentaerythrityl-tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate] was added to the decalcified solution as a stabilizer and mixed in a stirring tank for 1 hour.

[0070] <Solvent removal> The solution, mixed with a stabilizer, is heated to 180°C to remove the solvent and unreacted monomers, thereby obtaining a molten cyclic olefin copolymer (ethylene and tetracyclo[4.4.0.1 2,5 .1 7,10 A random copolymer with ]-3-dodecene was obtained.

[0071] <Extrusion> The cyclic olefin copolymer obtained above was kneaded and pelletized, and the resulting pellets were dried with hot air at a temperature of 100°C for 4 hours to obtain polymer (B-1), which is a cyclic olefin copolymer. The MFR, glass transition temperature, and density of the obtained polymer (B-1) were measured using the measurement method described above. The results are shown in Table 2.

[0072] [Table 2]

[0073] [Example 1] <Preparation of resin composition> 90 parts by mass of polymer (A-1) and 10 parts by mass of polymer (B-1) were loaded into a twin-screw extruder (PCM43, manufactured by Ikegai Co., Ltd., screw diameter: 43 mm). Subsequently, the resin composition was obtained by melt-kneading the mixture at 280°C and a rotation speed of 200 rpm using the twin-screw extruder. The density of the obtained resin composition was measured using the density gradient tube method in accordance with ASTM D792. The results are shown in Table 3. Density was 0.90 g / cm³. 3 We determined that anything less than that would be sufficiently lightweight.

[0074] <Preparation of injection-molded test specimens> The obtained resin composition was injected into a 4mm thick rectangular plate shape using a 70-ton injection molding machine (M70B) manufactured by Meiki Seisakusho Co., Ltd., under the conditions of cylinder temperature: 280°C and mold temperature: 60°C to produce injection-molded test specimens.

[0075] <Evaluation of Mechanical Properties> Using the injection-molded specimens obtained above, the fracture stress, thermal distortion temperature, and Izod impact strength were determined by the following method. The results are shown in Table 3.

[0076] [Tensile test] Using injection-molded specimens with a thickness of 4 mm, ISO dumbbell-type specimens were prepared in accordance with ISO 527. Tensile tests were conducted using an Instron 3380 universal tensile testing machine under the conditions of a tensile speed of 5 mm / min and a measurement temperature of 23°C, and the tensile fracture stress was measured.

[0077] [Heat distortion temperature test] Using injection-molded specimens with a thickness of 4 mm, a heat distortion temperature test was conducted in accordance with ISO 75 using an HDT measuring device manufactured by Yasuda Seiki Seisakusho Co., Ltd., under the conditions of a heating rate of 50°C / hour and a test load of 1.82 MPa, and the heat distortion temperature (HDT) was measured.

[0078] [Izod impact test (with notch)] Using injection-molded specimens with a thickness of 4 mm, and in accordance with ISO 180, an Izod impact test was conducted using a DG-IB type digital impact tester manufactured by Toyo Seiki Seisakusho Co., Ltd., under the conditions of hammer capacity: 3.92 J, swing angle: 148.9°, and test temperature: 23°C, and the Izod impact strength with notches was measured.

[0079] [Examples 2, 3, Comparative Examples 1, 2] The resin compositions were prepared in the same manner as in Example 1, except that the composition (amount of raw materials) was changed as shown in Table 3, and the density was measured. Injection-molded test specimens were prepared in the same manner as in Example 1, except that each of the obtained resin compositions was used, and their mechanical properties were evaluated. The results are shown in Table 3.

[0080] [Table 3]

Claims

1. A polymer (A) that satisfies the following requirements (A-I) and (A-II), A polymer (B) that satisfies the following requirements (B-I) and A resin composition containing the following: (A-I): The density of polymer (A) is 0.90 g / cm³. ３ It is less than. (A-II): The melting point of polymer (A), as measured by differential scanning calorimeter, is less than 240°C. (B-I): The glass transition temperature of polymer (B), as measured by differential scanning calorimeter, is 70°C or higher.

2. The composition according to claim 1, wherein the glass transition temperature of the polymer (B), as measured by a differential scanning calorimeter, is less than 170°C.

3. The resin composition according to claim 1 or 2, wherein the polymer (A) contains 50.0 to 100 mol% of structural units derived from 4-methyl-1-pentene and 0 to 50.0 mol% of structural units derived from α-olefins having 2 to 20 carbon atoms (excluding 4-methyl-1-pentene).

4. The polymer (B) is A constituent unit (B1) derived from α-olefins with 2 to 20 carbon atoms, A constituent unit (B2) derived from a cyclic olefin that does not have an aromatic ring and It has, The resin composition according to claim 1, wherein the cyclic olefin without an aromatic ring comprises a compound represented by the following formula (b2). 【Chemistry 1】 (In the above formula (b2), n is 0 or 1, m is 0 or a positive integer, q is 0 or 1, and R １ ~R １８ as well as R ａ and R ｂ are each independently a hydrogen atom, a halogen atom, or a hydrocarbon group which may be substituted with a halogen atom, and R １５ ~R １８ may be bonded to each other to form a monocyclic or polycyclic ring, and the monocyclic or polycyclic ring may have a double bond, and R １５ and R １６ or R １７ and R １８ may form an alkylidene group. However, it does not contain an aromatic ring.)

5. The density of the polymer (B) is 1.10 g / cm³. ３ The resin composition according to claim 1 or 2, which is as follows:

6. When the total amount of polymer (A) and polymer (B) in the resin composition is 100% by mass, The content of the polymer (A) is 55 to 95% by mass, The resin composition according to claim 1 or 2, wherein the content of the polymer (B) is 5 to 45% by mass.

7. Density is 0.90 g / cm³ ３ A resin composition according to claim 1 or 2, wherein the value is less than [value missing].

8. The melt flow rate of the polymer (A), measured at 260°C and a 5 kg load, was 1 to 500 g / 10 min. The resin composition according to claim 1 or 2, wherein the melt flow rate of the polymer (B), measured at 260°C and a 2.16 kg load, is 1 to 100 g / 10 min.

9. A molded article comprising the resin composition according to claim 1 or 2.

10. The molded article according to claim 9, which is an injection-molded article of the resin composition according to claim 1 or 2.

11. A method for manufacturing a molded article, comprising the step of injection molding a resin composition according to claim 1 or 2.

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