Conductive resin composition

Abstract

Provided are a conductive resin composition and a molded article thereof, which are suitable for energy devices, have excellent storage stability, and can achieve a texture more similar to an actual organ. The conductive resin composition contains component (A) 100 parts by mass of a hydrogenated styrene-based thermoplastic elastomer, component (B) 100-1000 parts by mass of oil, component (C) a polymer antistatic agent, and component (D) an ionic liquid, wherein the mass ratio of component (D) to component (C) is 2.7-10.

Description

[Technical Field]

[0001] The present invention relates to a conductive resin composition and a molded article thereof. [Background technology]

[0002] In recent years, expectations have been rising for minimally invasive surgeries that place less strain on the human body and are expected to result in a quicker recovery, such as surgeries using endoscopes or laparoscopes, and the number of cases in which these surgeries are used is increasing. For example, by removing tumors that have developed beneath the mucous membrane inside organs using an endoscope (endoscopic submucosal dissection, or ESD), surgery can be performed with smaller incisions compared to standard open surgery. This reduces the physical burden on patients, and shortens hospital stays, allowing for earlier return to society. Furthermore, there are an increasing number of cases in which surgical energy devices are used as instruments.

[0003] However, such medical procedures require advanced techniques. To improve the skills and quality of medical procedures, there is a demand for the development of realistic organ models for use in procedural training. To date, organ models that can achieve textures similar to those of real organs have been proposed (Patent Documents 1, 2, and 3).

[0004] [Patent Document 1] Patent Publication No. 2008-197483 [Patent Document 2] Patent Publication No. 2016-038563 [Patent Document 3] Patent Publication No. 2018-119020 Summary of the Invention

[0005] Conventional organ models have excellent preservation properties, but are not compatible with medical procedures using energy devices. Organ models compatible with energy devices have also been developed, but because they contain a certain amount of solvents such as water or ethylene glycol, they require solvent management and preservation measures (refrigerated storage in airtight containers). Even with these measures, long-term storage is difficult, and the solvent evaporates, causing changes in shape and prone to bleeding. Additionally, as described in International Publication No. 2020 / 045552, organ models that are compatible with energy devices and have excellent preservation properties have been developed, but there is a demand for models that can achieve a texture more similar to that of actual organs.

[0006] An object of the present invention is to provide a conductive resin composition that is compatible with energy devices, has excellent storage stability, and can achieve a texture that is more similar to that of a real organ, and a molded article made from the same.

[0007] That is, the present inventors have investigated various means and have found that, in a conductive resin composition containing a hydrogenated styrene-based thermoplastic elastomer, oil, a polymeric antistatic agent, and an ionic liquid, by adjusting the oil content and the mass ratio of the ionic liquid to the polymeric antistatic agent to a specific value, a conductive resin composition can be obtained that is compatible with energy devices, has excellent storage stability, and can achieve a texture similar to that of an actual organ, thereby completing the present invention.

[0008] The present invention, which solves the above problems, comprises the following: [1] A conductive resin composition comprising 100 parts by mass of component (A) a hydrogenated styrene-based thermoplastic elastomer and 100 to 1,000 parts by mass of component (B) an oil, and further comprising component (C) a polymeric antistatic agent and component (D) an ionic liquid, wherein the mass ratio of component (D) to component (C) is 2.7 to 10. [2] The conductive resin composition of [1], wherein the content of component (C) is 5 parts by mass or more but less than 100 parts by mass per 100 parts by mass of component (A). [3] The conductive resin composition of [1] or [2], wherein the component (D) ionic liquid is composed of a cation and an anion, and the content thereof is 50 to 250 parts by mass per 100 parts by mass of the component (A). [4] The conductive resin composition according to any one of [1] to [3], which has a tensile elongation at break of 50 to 4000%. [5] Volume resistivity is 1.0×10 2 ~1.0×10 7 The conductive resin composition according to any one of [1] to [4], wherein the resistivity is Ω·cm. [6] The conductive resin composition according to any one of [1] to [5], which is used for molding an organ model for incision and / or ablation with an energy device. [7] The conductive resin composition according to [6], wherein the energy device is selected from the group consisting of an electric scalpel, an ultrasonic scalpel, a high-frequency radio frequency scalpel, and a high-frequency hemostatic forceps. [8] A molded article made of any one of the conductive resin compositions [1] to [7]. [9] A molded product of [8], which is an organ model.

[0009] According to the present invention, it is possible to provide a conductive resin composition that is compatible with energy devices, has excellent storage stability, and can achieve a texture similar to that of a real organ, and a molded article thereof. DETAILED DESCRIPTION OF THE INVENTION

[0010] Various embodiments of the conductive resin composition will be described below, but if a specific description given for one embodiment also applies to other embodiments, that description will be omitted in the other embodiments.

[0011] [Conductive resin composition] The conductive resin composition of the present invention contains 100 parts by mass of component (A) a hydrogenated styrene-based thermoplastic elastomer and 100 to 1,000 parts by mass of component (B) an oil, and further contains component (C) a polymeric antistatic agent and component (D) an ionic liquid, wherein the mass ratio of component (D) to component (C) is 2.7 to 10.

[0012] [Component (A): Hydrogenated styrene-based thermoplastic elastomer] In one embodiment of the present invention, the hydrogenated styrene-based thermoplastic elastomer is a hydrogenated product of an aromatic vinyl-conjugated diene block copolymer comprising block polymerized units (X) derived from an aromatic vinyl and block polymerized units (Y) derived from a conjugated diene.

[0013] The aromatic vinyl-conjugated diene block copolymer with this structure has the following structure: X(YX) n or (XY) n [n is an integer of 1 or more]. Among these, X(YX) n Those in the form of XYX are preferred, and those in the form of XYX are particularly preferred. As those in the form of XYX, one or more copolymers selected from the group consisting of polystyrene-polybutadiene-polystyrene block copolymers, polystyrene-polyisoprene-polystyrene block copolymers, and polystyrene-polyisoprene-butadiene-polystyrene block copolymers are preferred.

[0014] In such aromatic vinyl-conjugated diene block copolymers, the aromatic vinyl block units (X), which are hard segments, exist as crosslinking points for the conjugated diene rubber block units (Y), forming pseudo-crosslinks (domains). The conjugated diene rubber block units (Y) present between these aromatic vinyl block units (X) are soft segments and possess rubber elasticity.

[0015] Examples of aromatic vinyls forming the block polymerized units (X) include styrene, α-methylstyrene, 3-methylstyrene, p-methylstyrene, 4-propylstyrene, 4-dodecylstyrene, 4-cyclohexylstyrene, 2-ethyl-4-benzylstyrene, 4-(phenylbutyl)styrene, 1-vinylnaphthalene, 2-vinylnaphthalene, etc. Among these, styrene is preferred.

[0016] Conjugated dienes that form the block polymerized units (Y) include butadiene, isoprene, pentadiene, 2,3-dimethylbutadiene, and combinations thereof. Among these, one or more conjugated dienes selected from the group consisting of butadiene, isoprene, and a combination of butadiene and isoprene (butadiene-isoprene copolymerization) are preferred. One or more conjugated dienes can also be used in combination. The conjugated diene block polymerized units (Y) consisting of butadiene-isoprene copolymerized units may be any of random copolymerized units, block copolymerized units, and tapered copolymerized units of butadiene and isoprene.

[0017] In the aromatic vinyl-conjugated diene block copolymer, the content of the aromatic vinyl block polymerization unit (X) is preferably 5% by mass or more and 50% by mass or less, and more preferably 20% by mass or more and 40% by mass or less. The content of the aromatic vinyl unit can be measured by a conventional method such as infrared spectroscopy or NMR spectroscopy.

[0018] In one embodiment of the present invention, the melt flow rate (MFR) of component (A) (temperature 230°C, load 2.16 kg) is 1 g / 10 min or less, preferably 0.1 g / 10 min or less. The MFR (temperature 230°C, load 2.16 kg) refers to the MFR measured in accordance with JIS K7210 at a temperature of 230°C and a load of 2.16 kg. By keeping the MFR at 1 g / 10 min or less, it is possible to prevent the bleed-out tendency and decrease in mechanical strength when oil is added. The MFR can be measured, for example, in accordance with JIS K7210.

[0019] The aromatic vinyl-conjugated diene block copolymers described above can be produced by various methods, including (1) a method in which an aromatic vinyl is sequentially polymerized followed by a conjugated diene using an alkyllithium compound such as n-butyllithium as an initiator, (2) a method in which an aromatic vinyl is sequentially polymerized followed by a conjugated diene using an alkyllithium compound as an initiator, followed by coupling with a coupling agent, and (3) a method in which a conjugated diene is sequentially polymerized followed by an aromatic vinyl using a lithium compound as an initiator.

[0020] The hydrogenated styrene-based thermoplastic elastomer used in the present invention is preferably a product obtained by hydrogenating the above-mentioned aromatic vinyl-conjugated diene block copolymer by a known method, and has a hydrogenation rate of 90 mol% or more. This hydrogenation rate is a value when the total amount of carbon-carbon double bonds in the conjugated diene block polymerized units (Y) is taken as 100 mol%. Examples of such hydrogenated styrene-based thermoplastic elastomers include polystyrene-poly(ethylene / propylene) block (SEP), polystyrene-poly(ethylene / propylene) block-polystyrene (SEPS), polystyrene-poly(ethylene / butylene) block-polystyrene (SEBS), and polystyrene-poly(ethylene-ethylene / propylene) block-polystyrene (SEEPS). More specifically, examples include SEPTON (manufactured by Kuraray Co., Ltd.), Kraton (manufactured by Shell Chemical Co., Ltd.), Kraton G (manufactured by Shell Chemical Co., Ltd.), and Tuftec (manufactured by Asahi Kasei Corporation) (all trade names).

[0021] The hydrogenation rate is measured by a known method such as nuclear magnetic resonance spectroscopy (NMR).

[0022] In the present invention, the hydrogenated styrene thermoplastic elastomer is preferably SEEPS. The shape of the hydrogenated styrene thermoplastic elastomer is preferably powder or amorphous (crumb) from the viewpoint of oil absorption before kneading.

[0023] [Component (B): Oil] The oil is not particularly limited, but examples thereof include paraffinic process oil, naphthenic process oil, aromatic process oil, mineral oil such as liquid paraffin, silicone oil, castor oil, linseed oil, olefin wax, mineral wax, etc. Among these, paraffinic and / or naphthenic process oil is preferred. Examples of process oil include Diana Process Oil Series (manufactured by Idemitsu Kosan Co., Ltd.) and JOMO Process P (manufactured by Japan Energy Corporation). The oil is used, for example, to soften the resin composition and adjust the elastic modulus and hardness of the organ model. One or more of the above oils can also be used in combination. From the viewpoint of workability, it is preferable to allow the oil to be absorbed in advance into the hydrogenated styrene thermoplastic elastomer.

[0024] The oil content is preferably 100 to 1,000 parts by mass, more preferably 100 to 700 parts by mass, even more preferably 100 to 600 parts by mass, and most preferably 200 to 500 parts by mass, per 100 parts by mass of component (A). The oil content is adjusted within the above range depending on the actual model organ site and lesion. By setting the oil content to 100 parts by mass or more per 100 parts by mass of component (A), insufficient softness can be prevented, and by setting the oil content to 1,000 parts by mass or less, it is possible to prevent the hydrogenated styrene-based thermoplastic elastomer from being unable to absorb all the oil and therefore being unable to compound.

[0025] [Component (C): Polymer antistatic agent] In one embodiment of the present invention, the polymeric antistatic agent is not particularly limited, but is preferably a copolymer of a hydrophobic polymer and a hydrophilic polymer, more preferably a copolymer having one or more hydrophobic polymer blocks and one or more hydrophilic polymer blocks. "Hydrophilic" refers to the presence of a functional group or polarity that forms intermolecular hydrogen bonds, while "hydrophobic" refers to non-hydrophilicity. The bonding pattern of each block may be a block copolymer in which a hydrophobic polymer block and a hydrophilic polymer block are linearly connected, or a graft copolymer in which a graft chain is connected as a branch chain to one of the polymer chains, but a block copolymer is more preferred. For example, antistatic agents described in JP 2001-278985 A, JP 2013-213195 A, JP 2015-096595 A, JP 2016-166332 A, JP 2017-101217 A, and WO 2016 / 084954 A can be used as the polymeric antistatic agent in one embodiment of the present invention.

[0026] More specifically, examples of such polyethers include those having hydrophilic groups and being block copolymerized (non-ionic types such as polyetheresteramides, ethylene oxide-epichlorohydrins, and polyetheresters, anionic types such as polystyrenesulfonic acids, and cationic types such as quaternary ammonium-containing poly(meth)acrylates). Among these, diblock copolymers having a structure in which a polyethylene glycol block and a polypropylene glycol block, or a polyether block and a polyolefin block are bonded via at least one bond selected from an ester bond, an amide bond, an ether bond, a urethane bond, and an imide bond, and block copolymers having a structure in which they are bonded repeatedly and alternately can be used. Examples of such copolymers include those having a volume resistivity of 10 5 ~10 11 Examples of suitable block copolymers include those having a structure in which polyether blocks, which are hydrophilic blocks with a resistance of Ω·cm, and polyolefin blocks are repeatedly and alternately bonded. The number average molecular weight (Mn) of such block copolymers is preferably 500 to 60,000.

[0027] Commercially available copolymers include those manufactured by Sanyo Chemical Industries under the trade names "Pelestat (registered trademark)" (such as "Pelestat 300", "Pelestat 230", "Pelestat NC6321", "Pelestat NC6322", "Pelestat NC7350", and "Pelestat HC250") and "Peletron (registered trademark)" (such as "Pelestat PVH", "Pelestat PVL", "Pelestat HS", and "Pelestat LMP-FS"); those manufactured by Sanko Chemical Industries under the trade names "Sankonol (registered trademark)" (such as "Sankonol TBX-65"); and those manufactured by Mitsui DuPont. Examples of such a solvent include "Entira (registered trademark) AS" manufactured by Arkema, "Pebax (registered trademark)" manufactured by Lubrizol Corporation, "Stat-Rite (registered trademark)" manufactured by IonPhasE, "IonPhasE (registered trademark) IPE (registered trademark) U2" manufactured by IonPhasE, "Pluronic (registered trademark) L-31" and "Pluronic (registered trademark) L-41" manufactured by Adeka Corporation, and "Alkox (registered trademark) EP1010N" and "Alkox (registered trademark) CP-A1H" manufactured by Meisei Chemical Industry Co., Ltd., and these may be used alone or in combination.

[0028] In addition, polyolefin blocks and polyisobutylene blocks with a volume resistivity of 1 × 10 5 ~1×10 11 The copolymer of this embodiment can be a block polymer in which a block of a hydrophilic polymer having a resistance of Ω·cm is bonded via at least one bond selected from the group consisting of an ester bond, an amide bond, an ether bond, an imide bond, and a urethane bond.

[0029] In addition, block polymers having a hydrophobic polymer block without polyether, a hydrophilic polymer block, and an aromatic ring-containing hydrophobic polyether block as structural units, and polyolefin blocks and polymers having a volume resistivity of 10 5 ~10 11Alternatively, a block polymer having a structure in which blocks of a hydrophilic polymer having a resistance of Ω·cm are repeatedly and alternately bonded, or a block polymer having as its constituent units blocks of at least one hydrophobic polymer selected from the group consisting of polyamide, polyolefin, and polyamide-imide, blocks of a hydrophilic polymer, and blocks of an aromatic ring-containing hydrophobic polyether, can be used.

[0030] The weight average molecular weight (Mn) (hereinafter abbreviated as Mw) of the copolymer of the present invention can be measured by gel permeation chromatography (GPC) under the following conditions. Equipment (examples): HLC-8321GPC / HT [manufactured by Tosoh Corporation], PL-GPC220 [manufactured by Agilent Technologies Inc.], SSSC-7100 [manufactured by Senshu Scientific Co., Ltd.] Column (example): "TSK GEL GMH HR-H(20)HT" [manufactured by Tosoh Corporation], 2 pieces Measurement temperature: 140℃ Sample solution: 0.3% by weight orthodichlorobenzene solution Solution injection volume: 100μl Detector: FT-IR detector Reference material: 12 standard polystyrenes (TSK standard POLYSTYRENE) (molecular weights: 500, 1,050, 2,800, 5,970, 9,100, 18,100, 37,900, 96,400, 190,000, 355,000, 1,090,000, 2,890,000) [manufactured by Tosoh Corporation]

[0031] The content of the polymeric antistatic agent is preferably 5 parts by mass or more but less than 100 parts by mass, more preferably 8 parts by mass or more but less than 80 parts by mass, and even more preferably 10 parts by mass or more but less than 60 parts by mass, relative to 100 parts by mass of component (A). The content of the polymeric antistatic agent contributes to the volume resistivity and tensile elongation at break.

[0032] [Component (D): Ionic liquid] The ionic liquid is not particularly limited, but may be composed of a cation and an anion. The ionic liquid according to one embodiment of the present invention does not contain a solvent such as water or ethylene glycol.

[0033] Examples of the cation include an amidinium cation, a pyridinium cation, a pyrazolium cation, and a guanidinium cation.

[0034] Examples of the amidinium cation include an imidazolinium cation, an imidazolium cation, a tetrahydropyrimidinium cation, and a dihydropyrimidinium cation. Examples of imidazolinium cations include 1,2,3,4-tetramethylimidazolinium cation, 1,3,4-trimethyl-2-ethylimidazolinium cation, 1,3-dimethylimidazolinium cation, 1,3-dimethyl-2,4-diethylimidazolinium cation, 1,2-dimethyl-3,4-diethylimidazolinium cation, 1-methyl-2,3,4-triethylimidazolinium cation, 1,2,3,4 -Tetraethylimidazolinium cation, 1,2,3-trimethylimidazolinium cation, 1,3-dimethyl-2-ethylimidazolinium cation, 1-ethyl-2,3-dimethylimidazolinium cation, 1,2,3-triethylimidazolinium cation, 4-cyano-1,2,3-trimethylimidazolinium cation, 3-cyanomethyl-1,2-dimethylimidazolinium cation, 2-cyanomethyl-1, Examples thereof include 3-dimethylimidazolinium cation, 4-acetyl-1,2,3-trimethylimidazolinium cation, 3-acetylmethyl-1,2-dimethylimidazolinium cation, 4-methylcarboxymethyl-1,2,3-trimethylimidazolinium cation, 3-methylcarboxymethyl-1,2-dimethylimidazolinium cation, 4-methoxy-1,2,3-trimethylimidazolinium cation, 3-methoxymethyl-1,2-dimethylimidazolinium cation, 4-formyl-1,2,3-trimethylimidazolinium cation, 3-formylmethyl-1,2-dimethylimidazolinium cation, 3-hydroxyethyl-1,2-dimethylimidazolinium cation, 4-hydroxymethyl-1,2,3-trimethylimidazolinium cation, and 2-hydroxyethyl-1,3-dimethylimidazolinium cation.

[0035] Examples of imidazolium cations include 1,3-dimethylimidazolium cation, 1,3-diethylimidazolium cation, 1-ethyl-3-methylimidazolium cation, 1,2,3-trimethylimidazolium cation, 1,2,3,4-tetramethylimidazolium cation, 1,3-dimethyl-2-ethylimidazolium cation, 1,2-dimethyl-3-ethyl-imidazolium cation, 1,2,3-triethylimidazolium cation, 1,2,3,4-tetraethylimidazolium cation, 1,3-dimethyl-2-phenylimidazolium cation, 1,3-dimethyl-2-benzylimidazolium cation, 1-benzyl-2,3-dimethyl-imidazolium cation, 4-cyano-1,2,3-trimethylimidazolium cation, 3-cyanomethyl-1,2-dimethylimidazolium cation, 2-cyanomethyl Examples of such cations include 2-hydroxyethyl-1,3-dimethylimidazolium cation, 4-acetyl-1,2,3-trimethylimidazolium cation, 3-acetylmethyl-1,2-dimethylimidazolium cation, 4-methylcarboxymethyl-1,2,3-trimethylimidazolium cation, 3-methylcarboxymethyl-1,2-dimethylimidazolium cation, 4-methoxy-1,2,3-trimethylimidazolium cation, 3-methoxymethyl-1,2-dimethylimidazolium cation, 4-formyl-1,2,3-trimethylimidazolium cation, 3-formylmethyl-1,2-dimethylimidazolium cation, 3-hydroxyethyl-1,2-dimethylimidazolium cation, 4-hydroxymethyl-1,2,3-trimethylimidazolium cation, and 2-hydroxyethyl-1,3-dimethylimidazolium cation.

[0036] Tetrahydropyrimidinium cations include 1,3-dimethyl-1,4,5,6-tetrahydropyrimidinium cation, 1,2,3-trimethyl-1,4,5,6-tetrahydropyrimidinium cation, 1,2,3,4-tetramethyl-1,4,5,6-tetrahydropyrimidinium cation, 1,2,3,5-tetramethyl-1,4,5,6-tetrahydropyrimidinium cation, 8-methyl-1,8-diazabicyclo[5,4,0]-7-undecenium cation, 5-methyl-1,5- Diazabicyclo[4,3,0]-5-nonenium cation, 4-cyano-1,2,3-trimethyl-1,4,5,6-tetrahydropyrimidinium cation, 3-cyanomethyl-1,2-dimethyl-1,4,5,6-tetrahydropyrimidinium cation, 2-cyanomethyl-1,3-dimethyl-1,4,5,6-tetrahydropyrimidinium cation, 4-acetyl-1,2,3-trimethyl-1,4,5,6-tetrahydropyrimidinium cation, 3-acetylmethyl-1,2-dimethyl-1,4 ,5,6-tetrahydropyrimidinium cation, 4-methylcarboxymethyl-1,2,3-trimethyl-1,4,5,6-tetrahydropyrimidinium cation, 3-methylcarboxymethyl-1,2-dimethyl-1,4,5,6-tetrahydropyrimidinium cation, 4-methoxy-1,2,3-trimethyl-1,4,5,6-tetrahydropyrimidinium cation, 3-methoxymethyl-1,2-dimethyl-1,4,5,6-tetrahydropyrimidinium cation, 4-formyl-1,2,3 3-hydroxyethyl-1,2-dimethyl-1,4,5,6-tetrahydropyrimidinium cation, 4-hydroxymethyl-1,2,3-trimethyl-1,4,5,6-tetrahydropyrimidinium cation, and 2-hydroxyethyl-1,3-dimethyl-1,4,5,6-tetrahydropyrimidinium cation.

[0037] Dihydropyrimidinium cations include 1,2,3-trimethyl-1,4-dihydropyrimidinium cation, 1,2,3,4-tetramethyl-1,4-dihydropyrimidinium cation, 1,2,3,5-tetramethyl-1,6-dihydropyrimidinium cation, 8-methyl-1,8-diazabicyclo[5,4,0]-7,9-undecadienium cation, 5-methyl-1,5-diazabicyclo[4,3,0]-5,7 -nonadienium cation, 4-cyano-1,2,3-trimethyl-1,6-dihydropyrimidinium cation, 3-cyanomethyl-1,2-dimethyl-1,4-dihydropyrimidinium cation, 2-cyanomethyl-1,3-dimethyl-1,4-dihydropyrimidinium cation, 4-acetyl-1,2,3-trimethyl-1,6-dihydropyrimidinium cation, 3-acetylmethyl-1,2-dimethyl-1,4-dihydro pyrimidinium cation, 4-methylcarboxymethyl-1,2,3-trimethyl-1,4-dihydropyrimidinium cation, 3-methylcarboxymethyl-1,2-dimethyl-1,4-dihydropyrimidinium cation, 4-methoxy-1,2,3-trimethyl-1,6-dihydropyrimidinium cation, 3-methoxymethyl-1,2-dimethyl-1,4-dihydropyrimidinium cation, 4-formyl-1,2,3-trimethyl-1,6-dihydropyrimidinium cation, 3-formylmethyl-1,2-dimethyl-1,6-dihydropyrimidinium cation, 3-hydroxyethyl-1,2-dimethyl-1,6-dihydropyrimidinium cation, 4-hydroxymethyl-1,2,3-trimethyl-1,4-dihydropyrimidinium cation, and 2-hydroxyethyl-1,3-dimethyl-1,4-hydropyrimidinium cation.

[0038] Examples of pyridinium cations include 3-methyl-1-propylpyridinium cation, 1-propyl-3-methylpyridinium cation, 1-butyl-3-methylpyridinium cation, 1-butyl-4-methylpyridinium cation, 1-butyl-3,4-dimethylpyridinium cation, and 1-butyl-3,5-dimethylpyridinium cation.

[0039] Examples of the pyrazolium cation include a 1,2-dimethylpyrazolium cation, a 1-methyl-2-propylpyrazolium cation, a 1-n-butyl-2-methylpyrazolium cation, and a 1-n-butyl-2-ethylpyrazolium cation.

[0040] Examples of the guanidinium cation include a guanidinium cation having an imidazolinium skeleton, a guanidinium cation having an imidazolium skeleton, a guanidinium cation having a tetrahydropyrimidinium skeleton, and a guanidinium cation having a dihydropyrimidinium skeleton.

[0041] Examples of guanidinium cations having an imidazolinium skeleton include 2-dimethylamino-1,3,4-trimethylimidazolinium cation, 2-diethylamino-1,3,4-trimethylimidazolinium cation, 2-diethylamino-1,3-dimethyl-4-ethylimidazolinium cation, 2-dimethylamino-1-methyl-3,4-diethylimidazolinium cation, 2-diethylamino-1-methyl-3,4-diethylimidazolinium cation, 2-diethylamino-1,3 ,4-Tetraethylimidazolinium cation, 2-dimethylamino-1,3-dimethylimidazolinium cation, 2-diethylamino-1,3-dimethylimidazolinium cation, 2-dimethylamino-1-ethyl-3-methylimidazolinium cation, 2-diethylamino-1,3-diethylimidazolinium cation, 1,5,6,7-tetrahydro-1,2-dimethyl-2H-imido[1,2a]imidazolinium cation, 1,5-dihydro-1,2-dimethyl-2H-imido [1,2a]imidazolinium cation, 1,5,6,7-tetrahydro-1,2-dimethyl-2H-pyrimido[1,2a]imidazolinium cation, 1,5-dihydro-1,2-dimethyl-2H-pyrimido[1,2a]imidazolinium cation, 2-dimethylamino-4-cyano-1,3-dimethylimidazolinium cation, 2-dimethylamino-3-cyanomethyl-1-methylimidazolinium cation, 2-dimethylamino-4-acetyl-1,3-dimethylimidazolinium cation On, 2-dimethylamino-3-acetylmethyl-1-methylimidazolinium cation, 2-dimethylamino-4-methylcarboxymethyl-1,3-dimethylimidazolinium cation, 2-dimethylamino-3-methylcarboxymethyl-1-methylimidazolinium cation, 2-dimethylamino-4-methoxy-1,3-dimethylimidazolinium cation, 2-dimethylamino-3-methoxymethyl-1-methylimidazolinium cation, 2-dimethylamino-4-formyl-1,Examples include 3-dimethylimidazolinium cation, 2-dimethylamino-3-formylmethyl-1-methylimidazolinium cation, 2-dimethylamino-3-hydroxyethyl-1-methylimidazolinium cation, and 2-dimethylamino-4-hydroxymethyl-1,3-dimethylimidazolinium cation.

[0042] Examples of guanidinium cations having an imidazolium skeleton include 2-dimethylamino-1,3,4-trimethylimidazolium cation, 2-diethylamino-1,3,4-trimethylimidazolium cation, 2-diethylamino-1,3-dimethyl-4-ethylimidazolium cation, 2-dimethylamino-1-methyl-3,4-diethylimidazolium cation, 2-diethylamino-1-methyl-3,4-diethylimidazolium cation, 2-diethylamino-1,3,4-tetraethylimidazolium cation, 2-dimethylamino -1,3-dimethylimidazolium cation, 2-diethylamino-1,3-dimethylimidazolium cation, 2-dimethylamino-1-ethyl-3-methylimidazolium cation, 2-diethylamino-1,3-diethylimidazolium cation, 1,5,6,7-tetrahydro-1,2-dimethyl-2H-imido[1,2a]imidazolium cation, 1,5-dihydro-1,2-dimethyl-2H-imido[1,2a]imidazolium cation, 1,5,6,7-tetrahydro-1,2-dimethyl-2H-pyrimido[1,2a]imidazolium nium cation, 1,5-dihydro-1,2-dimethyl-2H-pyrimido[1,2a]imidazolium cation, 2-dimethylamino-4-cyano-1,3-dimethylimidazolium cation, 2-dimethylamino-3-cyanomethyl-1-methylimidazolium cation, 2-dimethylamino-4-acetyl-1,3-dimethylimidazolinium cation, 2-dimethylamino-3-acetylmethyl-1-methylimidazolium cation, 2-dimethylamino-4-methylcarboxymethyl-1,3-dimethylimidazolium cation, 2-dimethylamino 2-dimethylamino-3-methylcarboxymethyl-1-methylimidazolium cation, 2-dimethylamino-4-methoxy-1,3-dimethylimidazolium cation, 2-dimethylamino-3-methoxymethyl-1-methylimidazolium cation, 2-dimethylamino-4-formyl-1,3-dimethylimidazolium cation, 2-dimethylamino-3-formylmethyl-1-methylimidazolium cation, 2-dimethylamino-3-hydroxyethyl-1-methylimidazolium cation and 2-dimethylamino-4-hydroxymethyl-1,Examples include 3-dimethylimidazolium cation.

[0043] Examples of guanidinium cations having a tetrahydropyrimidinium skeleton include 2-dimethylamino-1,3,4-trimethyl-1,4,5,6-tetrahydropyrimidinium cation, 2-diethylamino-1,3,4-trimethyl-1,4,5,6-tetrahydropyrimidinium cation, 2-diethylamino-1,3-dimethyl-4-ethyl-1,4,5,6-tetrahydropyrimidinium cation, 2-dimethylamino-1-methyl-3,4-diethyl-1,4,5,6-tetrahydropyrimidinium cation, 2-diethyl Amino-1-methyl-3,4-diethyl-1,4,5,6-tetrahydropyrimidinium cation, 2-diethylamino-1,3,4-tetraethyl-1,4,5,6-tetrahydropyrimidinium cation, 2-dimethylamino-1,3-dimethyl-1,4,5,6-tetrahydropyrimidinium cation, 2-diethylamino-1,3-dimethyl-1,4,5,6-tetrahydropyrimidinium cation, 2-dimethylamino-1-ethyl-3-methyl-1,4,5,6-tetrahydropyrimidinium cation, 2-diethylamino 1,3-diethyl-1,4,5,6-tetrahydropyrimidinium cation, 1,3,4,6,7,8-hexahydro-1,2-dimethyl-2H-imido[1,2a]pyrimidinium cation, 1,3,4,6-tetrahydro-1,2-dimethyl-2H-imido[1,2a]pyrimidinium cation, 1,3,4,6,7,8-hexahydro-1,2-dimethyl-2H-pyrimido[1,2a]pyrimidinium, 1,3,4,6-tetrahydro-1,2-dimethyl-2H-pyrimido[1,2a]pyrimidinium cation, 2-dimethyl 2-dimethylamino-4-cyano-1,3-dimethyl-1,4,5,6-tetrahydropyrimidinium cation, 2-dimethylamino-3-cyanomethyl-1-methyl-1,4,5,6-tetrahydropyrimidinium cation, 2-dimethylamino-4-acetyl-1,3-dimethyl-1,4,5,6-tetrahydropyrimidinium cation, 2-dimethylamino-3-acetylmethyl-1-methyl-1,4,5,6-tetrahydropyrimidinium cation, 2-dimethylamino-4-methylcarboxymethyl-1,3-dimethyl-1,4,5,Examples of such cations include 6-tetrahydropyrimidinium cation, 2-dimethylamino-3-methylcarboxymethyl-1-methyl-1,4,5,6-tetrahydropyrimidinium cation, 2-dimethylamino-4-methoxy-1,3-dimethyl-1,4,5,6-tetrahydropyrimidinium cation, 2-dimethylamino-3-methoxymethyl-1-methyl-1,4,5,6-tetrahydropyrimidinium cation, 2-dimethylamino-4-formyl-1,3-dimethyl-1,4,5,6-tetrahydropyrimidinium cation, 2-dimethylamino-3-formylmethyl-1-methyl-1,4,5,6-tetrahydropyrimidinium cation, 2-dimethylamino-3-hydroxyethyl-1-methyl-1,4,5,6-tetrahydropyrimidinium cation, and 2-dimethylamino-4-hydroxymethyl-1,3-dimethyl-1,4,5,6-tetrahydropyrimidinium cation.

[0044] Examples of guanidinium cations having a dihydropyrimidinium skeleton include 2-dimethylamino-1,3,4-trimethyl-1,4-dihydropyrimidinium cation, 2-diethylamino-1,3,4-trimethyl-1,6-dihydropyrimidinium cation, 2-diethylamino-1,3-dimethyl-4-ethyl-1,6-dihydropyrimidinium cation, 2-dimethylamino-1-methyl-3,4-diethyl-1,4-dihydropyrimidinium cation, and 2-diethylamino-1-methyl-3,4-diethyl-1,4-dihydropyrimidinium cation. Thione, 2-diethylamino-1,3,4-tetraethyl-1,6-dihydropyrimidinium cation, 2-dimethylamino-1,3-dimethyl-1,4-dihydropyrimidinium cation, 2-diethylamino-1,3-dimethyl-1,4-dihydropyrimidinium cation, 2-dimethylamino-1-ethyl-3-methyl-1,4-dihydropyrimidinium cation, 2-diethylamino-1,3-diethyl-1,6-dihydropyrimidinium cation, 1,6,7,8-tetrahydro-1,2-dimethyl-2H-imido[1,2a]pyrimidinium Cation, 1,6-dihydro-1,2-dimethyl-2H-imido[1,2a]pyrimidinium cation, 1,6,7,8-tetrahydro-1,2-dimethyl-2H-pyrimido[1,2a]pyrimidinium cation, 1,6-dihydro-1,2-dimethyl-2H-pyrimido[1,2a]pyrimidinium cation, 2-dimethylamino-4-cyano-1,3-dimethyl-1,4-dihydropyrimidinium cation, 2-dimethylamino-3-cyanomethyl-1-methyl-1,6-dihydropyrimidinium cation, 2-dimethylamino-4-acetyl-1,3 -Dimethyl-1,4-dihydropyrimidinium cation, 2-dimethylamino-3-acetylmethyl-1-methyl-1,4-dihydropyrimidinium cation, 2-dimethylamino-4-methylcarboxymethyl-1,3-dimethyl-1,4-dihydropyrimidinium cation, 2-dimethylamino-3-methylcarboxymethyl-1-methyl-1,4-dihydropyrimidinium cation, 2-dimethylamino-4-methoxy-1,3-dimethyl-1,6-dihydropyrimidinium cation, 2-dimethylamino-3-methoxymethyl-1-methyl-1,Examples include 4-dihydropyrimidinium cation, 2-dimethylamino-4-formyl-1,3-dimethyl-1,4,5,6-tetrahydropyrimidinium cation, 2-dimethylamino-3-formylmethyl-1-methyl-1,4,5,6-tetrahydropyrimidinium cation, 2-dimethylamino-3-hydroxyethyl-1-methyl-1,4,5,6-tetrahydropyrimidinium cation, and 2-dimethylamino-4-hydroxymethyl-1,3-dimethyl-1,4-dihydropyrimidinium cation.

[0045] Examples of the anion include anions obtained by removing a proton from the acids listed below. The anion may be a mixture of two or more types.

[0046] Carboxylic acids can be used as the anion, and specific examples thereof include monocarboxylic acids {aliphatic monocarboxylic acids having 1 to 30 carbon atoms [saturated monocarboxylic acids (formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, caproic acid, enanthic acid, caprylic acid, pelargonic acid, lauric acid, myristic acid, stearic acid, behenic acid, etc.), fluorine atom-containing carboxylic acids (trifluoroacetic acid, etc.), and unsaturated monocarboxylic acids (acrylic acid, methacrylic acid, oleic acid, etc.)] and aromatic monocarboxylic acids (benzoic acid, cinnamic acid, naphthoic acid, etc.)}, polycarboxylic acids (divalent to tetravalent polycarboxylic acids) {aliphatic polycarboxylic acids [saturated polycarboxylic acids (oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, benzoic acid, cinnamic acid, naphthoic acid, etc.)], and aromatic monocarboxylic acids (benzoic acid, cinnamic acid, naphthoic acid, etc.)]. unsaturated polycarboxylic acids (maleic acid, fumaric acid, itaconic acid, etc.); aromatic polycarboxylic acids (phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, pyromellitic acid, etc.); aliphatic oxycarboxylic acids (glycolic acid, lactic acid, tartaric acid, etc.); aromatic oxycarboxylic acids (salicylic acid, mandelic acid, etc.); sulfur-containing polycarboxylic acids (thiodipropionic acid, etc.); other polycarboxylic acids (cyclobutene-1,2-dicarboxylic acid, cyclopentene-1,2-dicarboxylic acid, furan-2,3-dicarboxylic acid, bicyclo[2,2,1]hept-2-ene-2,3-dicarboxylic acid, bicyclo[2,2,1]hepta-2,5-diene-2,3-dicarboxylic acid, etc.).

[0047] As the anion, a sulfonic acid can be used, and specific examples thereof include alkanesulfonic acids having 1 to 30 carbon atoms (such as methanesulfonic acid, ethanesulfonic acid, butanesulfonic acid, octanesulfonic acid, and dodecanesulfonic acid); and alkylbenzenesulfonic acids having 7 to 30 carbon atoms (such as octylbenzenesulfonic acid and dodecylbenzenesulfonic acid).

[0048] As the anion, an inorganic acid can be used, and specific examples include hydrofluoric acid, hydrochloric acid, sulfuric acid, phosphoric acid, HClO4, HBF4, HPF6, HAsF6, and HSbF6.

[0049] As the anion, a halogen atom-containing alkyl group-substituted inorganic acid (the alkyl group has 1 to 30 carbon atoms) can be used, specifically, HBF n (CF3) 4-n (n is an integer between 0 and 3), HPF n (CF3) 6-n (n is an integer of 0 to 5), trifluoromethanesulfonic acid, pentafluoroethanesulfonic acid, heptafluoropropanesulfonic acid, trichloromethanesulfonic acid, pentachloropropanesulfonic acid, heptachlorobutanesulfonic acid, tris(pentafluoroethyl)trifluorophosphate, trifluoroacetic acid, pentafluoropropionic acid, pentafluorobutanoic acid, trichloroacetic acid, pentachloropropionic acid, and heptachlorobutanoic acid.

[0050] As the anion, a halogen atom-containing sulfonylimide (having 1 to 30 carbon atoms) can be used, and specific examples include bis(fluoromethylsulfonyl)imide, bis(trifluoromethanesulfonyl)imide, and bis(fluorosulfonyl)imide.

[0051] As the anion, a halogen atom-containing sulfonyl methide (having 3 to 30 carbon atoms) can be used, and specific examples thereof include tris(trifluoromethylsulfonyl)methide.

[0052] As the anion, a halogen atom-containing carboxylic acid amide (having 2 to 30 carbon atoms) can be used, and specific examples include bis(trifluoroacet)amide.

[0053] As the anion, a nitrile group-containing imide can be used, and specific examples include HN(CN)2.

[0054] As the anion, a nitrile group-containing methide can be used, and specific examples include HC(CN)3.

[0055] As the anion, a halogen atom-containing alkylamine having 1 to 30 carbon atoms can be used, and specific examples include HN(CF3)2.

[0056] As the anion, cyanic acid can be used, and specific examples include thiocyanic acid.

[0057] Commercially available ionic liquids can also be used, such as CIL312 (N-butyl-3-methylpyridinium bistrifluoromethanesulfonylimide, manufactured by Nippon Carlit Co., Ltd.), Aminoion AS100 (manufactured by Nippon Nyukazai Co., Ltd.), Aminoion AS300 (manufactured by Nippon Nyukazai Co., Ltd.), FC-4400 (tri-n-butylmethylammonium bistrifluoromethanesulfonimide, manufactured by 3M), and Hishicolin (dodecyltributylphosphonium chloride, manufactured by Nippon Chemical Industry Co., Ltd.).

[0058] The method for synthesizing an ionic liquid is not particularly limited as long as the desired ionic liquid can be obtained. Examples of the method include the halide method, hydroxide method, acid ester method, complex formation method, and neutralization method described in "Ionic Liquids - The Frontline and Future of Development" [Hiroyuki Ohno, published in 2003 by CMC Publishing].

[0059] The content of the ionic liquid is preferably 50 to 250 parts by mass, more preferably 50 to 240 parts by mass, and even more preferably 70 to 210 parts by mass, per 100 parts by mass of component (A). The content of the ionic liquid contributes to the tensile elongation at break, and by setting the content of the ionic liquid to 50 parts by mass or more per 100 parts by mass of component (A), it contributes to suppressing an increase in volume resistivity, and by setting the content to 250 parts by mass or less, it is possible to suppress bleeding of the ionic liquid from the material.

[0060] (mass ratio of component (D) to component (C)) The mass ratio of component (D) to component (C) in the conductive resin composition of the present invention is 2.7 to 10. In one embodiment of the present invention, it is preferably 3.0 to 9.5, more preferably 3.0 to 9.0, and even more preferably 3.0 to 7.0. By setting the mass ratio of component (D) to component (C) to 2.7 or more, an increase in volume resistivity can be suppressed, and by setting it to 10 or less, a decrease in tensile elongation at break can be suppressed.

[0061] [Properties of the conductive resin composition] The conductive resin composition according to this embodiment is compatible with energy devices, has excellent storage stability, and can achieve a texture similar to that of a real organ. In addition, in one embodiment of the present invention, the conductive resin composition does not contain a solvent such as water or ethylene glycol.

[0062] The volume resistivity of the conductive resin composition is preferably 1.0×10 2 ~1.0×10 7 Ω·cm, and more preferably 1.0×10 2 ~1.0×10 6 Ω cm, and more preferably 1.0×10 2 ~5.0×10 5 Ω·cm. Volume resistivity is 1.0×10 7 By achieving a resistance of Ω·cm or less, incision using an energy device becomes possible. The volume resistivity can be determined by conditioning a test piece of the conductive resin composition, adjusted to a width of 25 mm, length of 25 mm, and thickness of 1 mm, in an environment of a temperature of 23±2°C and a relative humidity of 50±5% for at least 24 hours, and then measuring the volume resistivity 20 seconds after applying a voltage of 10 V using a resistivity meter Loresta-GP (model number: MCP-T610) manufactured by Mitsubishi Chemical Analytech Co., Ltd., using a PSP probe. The above measurement method was based on JIS C2139, with the sample size and other factors changed.

[0063] The tensile elongation at break of the conductive resin composition is preferably 50 to 4000%, more preferably 100 to 4000%, and even more preferably 300 to 4000%. By setting the tensile elongation at break to 50 to 4000%, it is possible to achieve a soft texture similar to that of an actual organ. The tensile elongation at break can be determined by measuring the elongation at break when a conductive resin composition adjusted to a thickness of 1 mm, a width of 10 mm, and a length of 80 mm is chucked with a 20 mm gap between chucks in a tensile testing machine (model number: AUTOGRAPH AG-X plus) manufactured by Shimadzu Corporation and pulled at a tensile speed of 50 mm / min at 23±2°C. The above measurement method was based on JIS K 7161-1:2014, with some changes to the sample size, etc.

[0064] The E hardness of the conductive resin composition is preferably less than 30, and more preferably 5 to 25. The E hardness can be measured, for example, by stacking sample sheets of the conductive resin composition having a thickness of 5.0 mm, in accordance with the JIS K7215 plastic durometer hardness test method, under conditions of 23±1°C.

[0065] [Uses of conductive resin composition] The conductive resin composition according to one embodiment of the present invention is used to mold an organ model to be incised and / or dissected with an energy device, or an organ model for training in endoscopic hemostasis using an energy device. Examples of energy devices include electric scalpels, ultrasonic scalpels, high-frequency radio frequency scalpels, high-frequency hemostatic forceps, heat probes, microwave scalpels, and laser scalpels. Examples of organs that can be used as models include lungs, heart, chest wall, abdominal wall, diaphragm, esophagus, gallbladder, stomach, duodenum, small intestine, large intestine, liver, kidneys, bladder, blood vessels, and skin.

[0066] The conductive resin composition of the present invention may optionally contain other resins, elastomers, rubbers, plasticizers, fillers, stabilizers, antioxidants, light resistance improvers, UV absorbers, softeners, lubricants, processing aids, colorants, antifogging agents, antiblocking agents, crystal nucleating agents, foaming agents, and the like. To produce the conductive resin composition of the present invention, any suitable known blending method can be used. For example, melt mixing can be performed using a single-screw or twin-screw extruder, a Banbury mixer, a plastomill, a co-kneader, a heated roll, or the like. Prior to melt mixing, the raw materials may be uniformly mixed using a Henschel mixer, ribbon blender, supermixer, tumbler, or the like. The melt mixing temperature is not particularly limited, but is generally 100 to 300°C, preferably 150 to 250°C. The various compositions of the present invention can be molded using known molding methods such as vacuum molding, injection molding, blow molding, and extrusion molding.

[0067] [Molded product] The molded article of the present invention is obtained by molding the conductive resin composition of the present invention.

[0068] The molded article according to one embodiment of the present invention can be used as an organ model such as a lung, heart, chest wall, abdominal wall, diaphragm, gallbladder, stomach, liver, kidney, urinary bladder, blood vessel, or skin.

[0069] When using the conductive resin composition of the present invention in an organ model, additives such as colorants such as pigments and dyes, fragrances, antioxidants, antibacterial agents, etc. may be used within the scope that does not impair the purpose. In order to make the organ model of the present invention resemble a living organ, it is preferable to color it with a colorant to a color similar to that of a living organ.

[0070] Organ models can be molded using known molding methods. For example, when using an inner mold (core) and an outer mold and pouring the resin into the space between them, the inner mold can be removed by making an incision in the molded resin and then removing the inner mold from there. At this time, the incision can be glued together to complete the organ model. Alternatively, multiple organ parts can be molded separately by injection molding or the like and then glued together to complete the organ model. [Example]

[0071] An embodiment of the present invention will be described in detail below. The present invention is not limited to the following embodiment, and can be carried out by making appropriate modifications within the scope that does not impair the effects of the present invention.

[0072] The various raw materials used in the examples are as follows: (A) Hydrogenated styrene-based thermoplastic elastomer SEEPS (SEPTON 4055, manufactured by Kuraray Co., Ltd.) (MFR (temperature 230°C, load 2.16 kg) 0.0 g / 10 min (0.0 g / 10 min means no flow), styrene content 30% by mass, hydrogenation rate 90 mol% or more) (B) Oil Paraffin oil (Diana Process Oil PW90, manufactured by Idemitsu Kosan Co., Ltd.) (C) Polymer antistatic agent C-1: Polyolefin / polyether copolymer (Pelectron PVL, manufactured by Sanyo Chemical Industries, Ltd.) (MFR (measured at 190°C and a load of 2.16 kg): 8 to 15 g / 10 min) C-2: Polyethylene glycol / polypropylene glycol copolymer (Pluronic® L-34, manufactured by Adeka Corporation) (average molecular weight 1700, ethylene oxide content 40%, viscosity at 25°C 300 mPa·s) (D) Ionic liquid CIL-312 (manufactured by Nippon Carlit Co., Ltd.)

[0073] The methods for evaluating various properties of the test pieces (sample sheets) of the conductive resin compositions prepared in the examples and comparative examples are as follows. (volume resistivity) A test piece of the conductive resin composition adjusted to a width of 25 mm, length of 25 mm, and thickness of 1 mm was conditioned for at least 24 hours in an environment of a temperature of 23±2°C and a relative humidity of 50±5%, and then the volume resistivity was measured 20 seconds after applying a voltage of 10 V using a PSP probe with a resistivity meter Loresta-GP (model number: MCP-T610) manufactured by Mitsubishi Chemical Analytech Co., Ltd.

[0074] (tensile elongation at break) A test piece of the conductive resin composition adjusted to a width of 10 mm, a length of 80 mm, and a thickness of 1 mm was chucked with a 20 mm gap between chucks in a tensile testing machine (model number: AUTOGRAPH AG-X plus) manufactured by Shimadzu Corporation, and the elongation at break was measured when the test piece was pulled at a tension speed of 50 mm / min at 23±2°C.

[0075] (Storage: Surface condition) A test piece (sample sheet) of the conductive resin composition measuring 5 cm square and 2 mm thick was prepared and stored for 3 days, after which the presence or absence of bleed-out of oil or the like from the surface was checked.

[0076] [Example 1] Oil, polymeric antistatic agent, and ionic liquid were added to 100 parts by mass of hydrogenated styrene-based thermoplastic elastomer and then stored for at least 12 hours to allow the ingredients to soak in. The mixture was kneaded at 180°C and a rotation speed of 100 rpm for 15 minutes using a segment mixer (Labo Plastomill KF70V2, manufactured by Toyo Seiki Co., Ltd.). Next, the mixture was subjected to a heat press method (180°C, 5 minutes, pressure 50 kg / cm 2 ) Test pieces (sample sheets) of the conductive resin composition for evaluating physical properties were prepared according to the evaluation items, and the above items were evaluated. The results are shown in Table 1.

[0077] [Examples 2 to 6, Comparative Examples 1 to 4] Test pieces (sample sheets) of the conductive resin composition were prepared according to the method of Example 1, except that the contents were as shown in Table 1, and the above items were evaluated. The results of volume resistivity and tensile elongation at break are shown in Table 1. The results of storage stability (surface condition) will be described later.

[0078] [Table 1]

[0079] The conductive resin compositions used in Examples 1 to 6 were found to have low volume resistivity, can be cut using an energy device, have excellent preservation properties, and can achieve a texture similar to that of actual organs. In contrast, the conductive resin composition used in Comparative Example 1 did not conduct electricity due to its high volume resistivity, and it was found that a molded article that could be cut with an energy device could not be produced. Furthermore, it was found that the conductive resin composition used in Comparative Example 2-4 had a low tensile elongation at break and was unable to achieve a texture similar to that of an actual organ. As a result of evaluation of storage stability (surface condition), no bleeding out occurred in either Example 1-6 or Comparative Example 1-4. [Industrial Applicability]

[0080] The conductive resin composition of the present invention is compatible with energy devices, has excellent storage stability, and can achieve a texture more similar to that of actual organs, and therefore can be used for producing organ models, etc.

Claims

1. A conductive resin composition comprising 100 parts by mass of component (A) a hydrogenated styrene-based thermoplastic elastomer, and 100 to 1,000 parts by mass of component (B) an oil, and further comprising component (C) a polymeric antistatic agent and component (D) an ionic liquid, wherein the mass ratio of component (D) to component (C) is 2.7 to 10, and the component (D) ionic liquid is composed of a cation and an anion, and the content thereof is 50 to 250 parts by mass per 100 parts by mass of component (A).

2. The conductive resin composition according to claim 1, wherein the content of component (C) is 5 parts by mass or more and less than 100 parts by mass per 100 parts by mass of component (A).

3. 3. The conductive resin composition according to claim 1, wherein the tensile elongation at break is 50 to 4000%.

4. Volume resistivity is 1.0 x 10 ２ ~1.0 x 10 ７ The conductive resin composition according to claim 1 or 2, having a resistivity of Ω·cm.

5. 3. The conductive resin composition according to claim 1, which is used for molding an organ model to be incised and / or peeled off with an energy device.

6. 6. The conductive resin composition according to claim 5, wherein the energy device is selected from the group consisting of an electric scalpel, an ultrasonic scalpel, a high-frequency radio frequency scalpel, and a high-frequency hemostatic forceps.

7. A molded article made from the conductive resin composition according to claim 1 or 2.

8. The molded article according to claim 7, which is an organ model.

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