Pipe for electronic component manufacturing or medical use, and method for producing the same

Abstract

To provide a pipe for electronic component manufacturing or medical use that exhibits excellent contamination resistance while ensuring sufficient rigidity and high resistance to buckling.SOLUTION: A pipe for electronic component manufacturing or medical use comprises a resin composition obtained by melt-kneading 100 pts.mass of a cyclic olefin polymer (A) having a glass transition temperature of 60-200°C, 15-150 pts.mass of a soft copolymer (B) obtained by polymerizing two or more monomers selected from the group consisting of olefins, dienes, and aromatic vinyl hydrocarbons and having a glass transition temperature of 0°C or lower, and 0.001-1 pt.mass of a radical initiator (C).SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a pipe for use in the manufacture of electronic components or for medical use, and also to a method for manufacturing such a pipe for use in the manufacture of electronic components or for medical use. [Background technology]

[0002] Resin pipes used in the electronics manufacturing and medical fields are required to have a high level of contamination resistance so that they do not become a source of contamination. Also, from an environmental perspective, there is a demand for alternative materials to the conventionally used polyvinyl chloride resins and fluororesins.

[0003] Cyclic olefin polymers are known as resins with high contamination resistance. Patent Document 1 describes a molded article for clean rooms made from a resin composition obtained by melt-kneading a specific cyclic olefin polymer, a soft copolymer, a radical initiator, and a polyfunctional compound. The article describes that the molded article for clean rooms has excellent chemical resistance, heat resistance, and dimensional accuracy, suppresses the release of volatile components into the surrounding area, and also has excellent abrasion resistance and suppresses particle generation. However, there is no description or suggestion of using the molded article as a pipe.

[0004] Patent Document 2 describes a medical device composition containing a copolymer of norbornene monomer and ethylene monomer and an ethylene-α-olefin copolymer as a material for medical devices that is optically transparent, environmentally compatible, and has sufficient yield strength and flexibility, and can be used as an alternative to polyvinyl chloride. However, when the composition is made into a pipe, it has the problem of being prone to buckling when bent. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2006 / 025294 [Patent Document 2] Special Publication No. 2003-508623 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made to solve the above problems, and provides a pipe for use in the manufacture of electronic components or for medical use that has high contamination resistance, sufficient rigidity, and high buckling resistance, and also provides a method for manufacturing such a pipe for use in the manufacture of electronic components or for medical use. [Means for solving the problem]

[0007] The present inventors have conducted extensive research to solve the above problems and have completed the present invention, which comprises the following items [1] to [7].

[0008] [1] A pipe for use in the production of electronic components or for medical use, comprising a resin composition obtained by melt-kneading 100 parts by mass of a cyclic olefin polymer (A) having a glass transition temperature of 60 to 200°C, 15 to 150 parts by mass of a soft copolymer (B) having a glass transition temperature of 0°C or lower, which is obtained by polymerizing at least two or more monomers selected from the group consisting of olefins, dienes, and aromatic vinyl hydrocarbons, and 0.001 to 1 part by mass of a radical initiator (C). [2] The pipe for manufacturing electronic components or for medical use according to [1], wherein the resin composition is further obtained by melt-kneading 0.001 to 1 part by mass of a polyfunctional compound (D) having two or more radically polymerizable functional groups in the molecule with respect to 100 parts by mass of the cyclic olefin polymer (A).

[0009] [3] The pipe for electronic component production or medical use according to [1] or [2], wherein the cyclic olefin polymer (A) is an addition polymer (A1) of a monomer having a norbornene ring and an α-olefin, as represented by the following formula [I], or a ring-opening polymer (A2) of a monomer having a norbornene ring, as represented by the following formula [I], or a hydrogenated product thereof.

[0010] [ka] (In the above formula [I], n is 0 or 1, m is 0 or a positive integer, q is 0 or 1, and R 1 ~R 18 and R a and R b are each independently a hydrogen atom, a halogen atom, or a hydrocarbon group, 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 With or R 17 and R 18 and may form an alkylidene group.)

[0011] [4] A pipe for manufacturing electronic components or for medical use according to any one of [1] to [3], wherein the soft copolymer (B) is an amorphous or low-crystalline soft copolymer obtained by copolymerizing ethylene with an α-olefin having 3 to 20 carbon atoms. [5] The pipe for use in the production of electronic components or for medical use according to any one of [1] to [4], wherein the resin composition has a flexural modulus of 500 to 2100 MPa as measured in accordance with JIS K7171, and a tensile elongation at break of 20% or more as measured in accordance with JIS K7161. [6] A method for producing a pipe for use in producing electronic components or medical use, comprising melt-kneading 100 parts by mass of a cyclic olefin polymer (A) having a glass transition temperature of 60 to 200°C, 15 to 150 parts by mass of a soft copolymer (B) obtained by polymerizing at least two or more monomers selected from the group consisting of olefins, dienes, and aromatic vinyl hydrocarbons, and having a glass transition temperature of 0°C or lower, and 0.001 to 1 part by mass of a radical initiator (C), and melt-molding the resulting resin composition. [7] The method for producing a pipe for manufacturing electronic components or medical use according to [6], wherein the resin composition is extrusion-molded. [Effects of the Invention]

[0012] The pipe for electronic component manufacturing or medical use of the present invention has high contamination resistance, and also has sufficient rigidity and high buckling resistance. Therefore, such a pipe is suitable for use in electronic component manufacturing equipment, medical instruments, etc. According to the manufacturing method of the present invention, the pipe for electronic component manufacturing or medical use can be manufactured with high productivity. [Brief explanation of the drawings]

[0013] [Figure 1] 4 is a photograph showing the state of a pipe during a buckling test in Example 1. [Figure 2] 10 is a photograph of a buckled pipe in Comparative Example 2. [Figure 3] 1 is a graph in which the flexural modulus is plotted on the horizontal axis and the tensile elongation at break is plotted on the vertical axis for the resin compositions of Examples 1 and 2 and Comparative Examples 1 to 3. [Figure 4] The graph shows the bending modulus of the resin composition in Examples 1 and 2 and Comparative Example 2 plotted on the horizontal axis and the average distance from the wall to the end (hand side) of the pipe when the pipe buckled on the vertical axis. DETAILED DESCRIPTION OF THE INVENTION

[0014] The pipe for electronic component manufacturing or medical use of the present invention comprises a resin composition obtained by melt-kneading 100 parts by mass of a cyclic olefin polymer (A) having a glass transition temperature of 60 to 200°C, 15 to 150 parts by mass of a soft copolymer (B) having a glass transition temperature of 0°C or lower, which is obtained by polymerizing at least two or more monomers selected from the group consisting of olefins, dienes, and aromatic vinyl hydrocarbons, and 0.001 to 1 part by mass of a radical initiator (C). The resin composition contains few volatile components released into the environment or components eluted in water or chemical solutions, and has an excellent balance between flexural modulus and tensile elongation at break. Therefore, the pipe of the present invention has high contamination resistance and is simultaneously sufficient rigidity and buckling resistance. Such a pipe is suitable for use in electronic component manufacturing equipment, medical devices, and the like.

[0015] The cyclic olefin polymer (A) used in the present invention may be obtained by polymerizing only an olefin monomer having an alicyclic skeleton, or may be a copolymer of an olefin monomer having an alicyclic skeleton and another copolymerizable monomer. The amount of copolymerized other monomers is usually less than 50% by mass, preferably less than 40% by mass, and more preferably less than 30% by mass. The cyclic olefin polymer (A) is less likely to generate volatile organic compounds and has high contamination resistance. Furthermore, since the cyclic olefin polymer (A) is an amorphous polymer having a saturated hydrocarbon ring structure in the main chain or side chain, pipes with high dimensional accuracy can be obtained. Furthermore, since the cyclic olefin polymer (A) is a polyolefin, water and chemical solutions flow easily through it and it has high chemical resistance.

[0016] Specific examples of the cyclic olefin polymer (A) include addition polymers of a monomer having a norbornene ring and an α-olefin, which are sold by Mitsui Chemicals, Inc. under the trade name "APEL" and by Polyplastics Co., Ltd. under the trade name "TOPAS." Ring-opening polymers of a monomer having a norbornene ring and hydrogenated products thereof are also included, which are sold by Zeon Corporation under the trade names "ZEONEX" and "ZEONOR." All of the above cyclic olefin polymers are readily available as commercially available products. The chemical structure of the cyclic olefin monomer having a norbornene ring used here is as shown in formula [I] below.

[0017] [ka]

[0018] (In the above formula [I], n is 0 or 1, m is 0 or a positive integer, q is 0 or 1, and R 1 ~R 18 and R a and R b are each independently a hydrogen atom, a halogen atom, or a hydrocarbon group, and R 15 ~R 18may 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 With or R 17 and R 18 and may form an alkylidene group.)

[0019] Suitable monomers having a norbornene ring include norbornene (n=0, m=0, R 7 ~R 10 , R 15 ~R 18 are all hydrogen atoms), tetracyclo[4.4.0.1 2,5 .1 7,10 ]-3-dodecene (n=0, m=1, R 7 ~R 18 are both hydrogen atoms).

[0020] The addition polymer of a monomer having a norbornene ring and an α-olefin is preferably an ethylene-cyclic olefin random copolymer. From the viewpoints of heat resistance, rigidity, etc., the ethylene content is preferably 5 to 50% by mass. The ethylene content is more preferably 10% by mass or more, and even more preferably 15% by mass or more. Furthermore, the ethylene content is more preferably 40% by mass or less, and even more preferably 30% by mass or less.

[0021] The glass transition temperature (Tg) of the cyclic olefin polymer (A) is 60 to 200°C. From the viewpoint of the heat resistance and dimensional stability of the resulting pipe, the glass transition temperature must be 60°C or higher, preferably 80°C or higher, and more preferably 100°C or higher. On the other hand, a glass transition temperature of 200°C or lower improves the fluidity during molding, allowing for easy melt molding. The glass transition temperature is more preferably 200°C or lower, and even more preferably 180°C or lower. The glass transition temperature is measured by DSC (heating rate 10°C / min).

[0022] The soft copolymer (B) is obtained by polymerizing at least two or more monomers selected from the group consisting of olefins, dienes, and aromatic vinyl hydrocarbons, and has a glass transition temperature of 0°C or lower. Specific examples include amorphous or low-crystalline thermoplastic soft copolymers obtained by copolymerizing ethylene with an α-olefin having 3 to 20 carbon atoms, and a preferred example is an ethylene-propylene copolymer. The glass transition temperature of the thermoplastic soft copolymer is preferably -10°C or lower, more preferably -20°C or lower. Furthermore, the glass transition temperature is usually -100°C or higher. The crystallinity measured by X-ray diffraction is preferably 0 to 30%, more preferably 0 to 25%.

[0023] The radical initiator (C) may be any initiator that thermally decomposes upon heating during melt-kneading to generate radicals, and its type is not particularly limited. Examples include peroxides, azo compounds, and redox initiators. Among these, organic peroxides are preferred. The radical initiator (C) preferably decomposes at an appropriate rate during melt-kneading, and its 1-minute half-life temperature is preferably 30 to 250°C. The 1-minute half-life temperature is more preferably 100°C or higher and 230°C or lower. Thus, the greatest feature of the present invention is the blending of the radical initiator (C) with the cyclic olefin polymer (A) and the soft copolymer (B). Generally, crosslinking a resin improves its rigidity but reduces its flexibility. However, a resin composition obtained by blending the radical initiator (C) with the cyclic olefin polymer (A) and the soft copolymer (B) and then melt-kneading the resulting mixture to react surprisingly exhibits a higher tensile elongation at break than a blend of the cyclic olefin polymer (A) and the soft copolymer (B) with the same flexural modulus. Furthermore, a pipe obtained using the resin composition has both sufficient rigidity and high buckling resistance.

[0024] The polyfunctional compound (D) is a compound having two or more radically polymerizable functional groups in the molecule. Examples of the polyfunctional compound (D) include divinylbenzene, vinyl acrylate, vinyl methacrylate, triaryl isocyanurate, diaryl phthalate, ethylene dimethacrylate, and trimethylolpropane trimethacrylate.

[0025] The blending ratio of these components is 100 parts by mass of the cyclic olefin polymer (A), 15 to 150 parts by mass of the soft copolymer (B), 0.005 to 1 part by mass of the radical initiator (C), and, if necessary, 0.005 to 1 part by mass of the polyfunctional compound (D).

[0026] By melt-kneading a cyclic olefin polymer (A), a soft copolymer (B), and a radical initiator (C) as essential components, with a polyfunctional compound (D) as an optional component, the cyclic olefin polymer (A) and the soft copolymer (B) react to produce a resin composition as a reaction product. The presence of the polyfunctional compound (D) can more effectively form crosslinks. Such a resin composition is disclosed in International Publication No. 2006 / 025294. Such a resin composition is also sold, for example, by Fuji Bakelite Co., Ltd. under the trade name "e-mateX."

[0027] The amount of the soft copolymer (B) is 15 to 150 parts by mass per 100 parts by mass of the cyclic olefin polymer (A). When the amount of the soft copolymer (B) is 15 parts by mass or more, the flexibility of the resin composition is improved, and the buckling resistance of the resulting pipe is improved. The amount of the soft copolymer (B) is preferably 18 parts by mass or more, more preferably 22 parts by mass or more, even more preferably 30 parts by mass or more, and particularly preferably 35 parts by mass or more. On the other hand, when the amount of the soft copolymer (B) is 150 parts by mass or less, the contamination resistance of the pipe is improved and rigidity suitable for use as a pipe for electronic component manufacturing or medical use is obtained. The amount of the soft copolymer (B) is preferably 100 parts by mass or less, more preferably 80 parts by mass or less, even more preferably 60 parts by mass or less, and particularly preferably 50 parts by mass or less.

[0028] The amount of radical initiator (C) blended is 0.001 to 1 part by mass per 100 parts by mass of cyclic olefin polymer (A). When the amount of radical initiator (C) blended is 0.001 part by mass or more, the tensile elongation at break of the resin composition is improved, and the buckling resistance of the resulting pipe is improved. The amount of radical initiator (C) blended is preferably 0.005 part by mass or more, more preferably 0.01 part by mass or more. On the other hand, when the amount of radical initiator (C) blended is 1 part by mass or less, the stain resistance of the pipe is improved. The amount of radical initiator (C) blended is preferably 0.5 parts by mass or less.

[0029] The incorporation of a polyfunctional compound (D) is optional and does not necessarily require incorporation, but incorporation is preferred because it further improves the tensile elongation at break of the resin composition and further improves the buckling resistance of the resulting pipe. In this case, the amount of polyfunctional compound (D) is preferably 0.001 to 1 part by mass per 100 parts by mass of cyclic olefin polymer (A). The amount is more preferably 0.005 parts by mass or more, and even more preferably 0.01 parts by mass or more. On the other hand, by incorporating the polyfunctional compound (D) in an amount of 1 part by mass or less, the contamination resistance of the pipe is improved. The amount of polyfunctional compound (D) is preferably 0.5 parts by mass or less.

[0030] Additives other than the cyclic olefin polymer (A), the soft copolymer (B), the radical initiator (C), and the polyfunctional compound (D) may be blended within a range that does not impair the properties required for the present invention. For example, small amounts of various additives such as resins other than the cyclic olefin polymer (A) and the soft copolymer (B), fillers, colorants, UV absorbers, plasticizers, antioxidants, heat stabilizers, lubricants, and antibacterial agents may be included. The content of these additives is preferably 10% by mass or less, and more preferably 5% by mass or less, based on the mass of the entire resin composition.

[0031] The resin composition preferably has a flexural modulus of 500 to 2100 MPa, as measured in accordance with JIS K7171. A flexural modulus of 500 MPa or more of the resin composition provides rigidity particularly suitable for use as a pipe for manufacturing electronic components or for medical applications. The flexural modulus is more preferably 800 MPa or more, and may be 1000 MPa or more or 1200 MPa or more. On the other hand, the flexural modulus is more preferably 2000 MPa or less, and even more preferably 1800 MPa or less.

[0032] The tensile elongation at break of the resin composition, measured in accordance with JIS K7161, is preferably 20% or more. This further improves the flex resistance of the resulting pipe. The tensile elongation at break is more preferably 25% or more, even more preferably 30% or more, and particularly preferably 32% or more. On the other hand, the tensile elongation at break is usually 150% or less, and preferably 100% or less.

[0033] In order to further improve the buckling resistance of the resulting pipe, it is preferable that both the flexural modulus and tensile elongation at break of the resin composition are within the above ranges.

[0034] A preferred method for producing a pipe for electronic component production or medical use according to the present invention comprises melt-kneading 100 parts by mass of a cyclic olefin polymer (A) having a glass transition temperature of 60 to 200°C, 15 to 150 parts by mass of a soft copolymer (B) having a glass transition temperature of 0°C or lower, which is obtained by polymerizing at least two monomers selected from the group consisting of olefins, dienes, and aromatic vinyl hydrocarbons, and 0.001 to 1 part by mass of a radical initiator (C), and melt-molding the resulting resin composition. In this case, it is preferable to add a polyfunctional compound (D) having two or more radically polymerizable functional groups in the molecule together with the radical initiator (C). The blending amount of the polyfunctional compound (D) is preferably 0.001 to 1 part by mass per 100 parts by mass of the cyclic olefin polymer (A).

[0035] The temperature at which the cyclic olefin polymer (A), the soft copolymer (B), and the radical initiator (C) are melted and kneaded may be any temperature at which the cyclic olefin polymer (A) and the soft copolymer (B) can melt and the radical initiator (C) can decompose. Specifically, a temperature of 150 to 350°C is preferred. To efficiently promote the crosslinking reaction, the kneading temperature is more preferably 200°C or higher. Furthermore, to prevent excessive thermal decomposition of the resin, the kneading temperature is more preferably 300°C or lower. It is preferable to use a radical initiator (C) whose half-life is 1 minute or less at such a kneading temperature.

[0036] The method for melt-kneading the cyclic olefin polymer (A), the soft copolymer (B), and the radical initiator (C) is not particularly limited, but examples thereof include a method in which the cyclic olefin polymer (A), the soft copolymer (B), the radical initiator (C), and, if necessary, the polyfunctional compound (D) are melt-kneaded in an extruder. At this time, the melt-kneaded resin composition may be molded as is, or the resin composition may be melt-kneaded, and then pelletized, and then melt-molded.

[0037] The melt molding method of the resin composition is not particularly limited, and a general melt molding method is used. Examples include extrusion molding, injection molding, compression molding, etc., and among these, extrusion molding is preferred. An example of a method for extrusion molding the resin composition is a method in which the resin composition is heated and melted in an extruder, extruded into a cylindrical shape from a die, and then cooled to obtain a pipe. The temperature during melt molding is preferably in the same range as the temperature during melt kneading of the cyclic olefin polymer (A), the soft copolymer (B), and the radical initiator (C).

[0038] The outer diameter and thickness of the pipe may be determined depending on the application and are not particularly limited, but the outer diameter is usually 1 to 100 mm. The outer diameter is preferably 3 mm or more, more preferably 5 mm or more. On the other hand, the outer diameter is preferably 50 mm or less, more preferably 30 mm or less. The thickness of the pipe is usually 0.1 to 10 mm. The thickness is preferably 0.2 mm or more, more preferably 0.3 mm or more. On the other hand, the thickness is preferably 8 mm or less, more preferably 5 mm or less.

[0039] The pipe for electronic component manufacturing or medical use of the present invention has high contamination resistance and also has sufficient rigidity and buckling resistance, and is therefore suitable for use in electronic component manufacturing equipment such as cleaning equipment and etching equipment, medical devices such as intubation tubes and bulk tubes, and for transporting liquids. [Example]

[0040] The resin composition used in the present invention and the pipe of the present invention were specifically evaluated using the following examples.

[0041] Example 1 100 parts by mass of the following cyclic olefin polymer (A), 42.9 parts by mass of an ethylene-propylene random copolymer (B), 0.5 parts by mass of a radical initiator (C), and 0.5 parts by mass of a polyfunctional compound (D) were melt-kneaded and reacted in an extruder, and then pelletized to obtain resin composition pellets.

[0042] Cyclic olefin polymer (A) TOPAS 6013M-07, a cyclic olefin copolymer (COC) manufactured by Polyplastics Co., Ltd. This COC is amorphous, has a glass transition temperature (DSC) of 142°C (heating rate 10°C / min) and a MFR (260°C, 2.16 kg load) of 13 g / 10 min.

[0043] ·Soft copolymer (B) Ethylene-propylene random copolymer "P-0680" manufactured by Mitsui Chemicals, Inc. The glass transition temperature is below 0°C, the MFR (230°C, 2.16 kg load) is 0.8 g / 10 min, and the density is 0.869 g / cm 3 is.

[0044] Radical initiator (C) "Perhexyne 25B" manufactured by Nippon Oil & Fats Co., Ltd. The main component (90% or more) is 2,5-dimethyl-2,5-bis(t-butylperoxy)hexyne-3. The one-minute half-life temperature is 194.3°C.

[0045] ·Multifunctional compound (D) Divinylbenzene

[0046] (Evaluation of bending properties) The pellets were injection molded (resin temperature 280°C, mold temperature 40°C, injection speed 50 mm / sec, injection pressure 60 MPa) to obtain five test pieces measuring 10 mm wide x 80 mm long x 4 mm thick. The flexural modulus (MPa) of the test pieces was measured in accordance with JIS K7171 (Method A) and the average value of the five pieces was calculated. The results are shown in Table 1. The measurement conditions are as follows: Temperature 23℃ Measuring equipment: Orientec Co., Ltd. Tensilon universal material testing machine (model RTC-1325A) Load cell: 1kN Terminal: (top) radius = 5mm, (bottom) radius = 5mm Distance between fulcrums: 64mm Test speed: 2mm / min

[0047] (Evaluation of tensile properties) Five test pieces identical to those used in the evaluation of the bending properties were prepared. The tensile elongation at break of the test pieces was measured in accordance with JIS K7161, and the average value of the five pieces was calculated. The results are shown in Table 1. Figure 3 shows a graph in which the bending modulus of elasticity of the resin composition is plotted on the horizontal axis and the tensile elongation at break on the vertical axis. The measurement conditions are shown below. Temperature 23℃ Measuring equipment: Orientec Co., Ltd. Tensilon universal material testing machine (model RTC-1325A) Test conditions Load cell: 10kN Distance between gauge lines: 50mm Test speed: 1mm / min

[0048] (Pipe buckling resistance evaluation) The pellets were melted at 255°C using a 1820mm, L / D=28 single-screw extruder, extruded through a straight spiral die with a discharge rate of 3.9 kg / hour and a compression ratio of 2.5, the diameter of which was controlled by outer diameter sizing, cooled, and taken up at a speed of 1.83 m / min to obtain a pipe with an outer diameter of 10 mm, an inner diameter of 8 mm, and a thickness of 1 mm.

[0049] The obtained pipe was cut to a length of 50 cm. Figure 1 is a photograph taken of the state of the pipe during the buckling test. As shown in Figure 1, one end of the pipe was pressed against a wall and the other end was manually pushed toward the wall to bend the pipe, and the distance from the wall to the end (hand side) of the pipe when the pipe buckled was measured. Figure 2 shows a photograph taken of the pipe when buckled in Comparative Example 2 described below. This measurement was repeated five times and the average value was calculated. The results are shown in Table 1. Figure 4 is a graph in which the flexural modulus of the resin composition is plotted on the horizontal axis and the average value of the distance from the wall to the end (hand side) of the pipe when the pipe buckled is plotted on the vertical axis.

[0050] [Example 2, Comparative Example 1] Resin compositions and pipes were produced and evaluated in the same manner as in Example 1, except that the amount of soft copolymer (B) was changed as shown in Table 1. The results are shown in Table 1. However, the buckling resistance of the pipe was evaluated only in Example 2.

[0051] [Comparative Examples 2 and 3] Resin compositions and pipes were produced and evaluated in the same manner as in Example 1, except that the amount of soft copolymer (B) was changed as shown in Table 1 and that the radical initiator (C) and the polyfunctional compound (D) were not added. The results are shown in Table 1. However, the buckling resistance of the pipe was evaluated only in Comparative Example 2.

[0052] [Table 1]

Claims

1. 100 parts by mass of a cyclic olefin polymer (A) having a glass transition temperature of 60 to 200°C, 15 to 150 parts by mass of a soft copolymer (B) obtained by polymerizing at least two or more monomers selected from the group consisting of olefins, dienes, and aromatic vinyl hydrocarbons, and having a glass transition temperature of 0°C or lower; and A pipe for use in the manufacture of electronic components or for medical use, comprising a resin composition obtained by melt-kneading 0.001 to 1 part by mass of a radical initiator (C).

2. 2. The pipe for electronic component production or medical use according to claim 1, wherein the resin composition is obtained by melt-kneading a polyfunctional compound (D) having two or more radically polymerizable functional groups in the molecule in an amount of 0.001 to 1 part by mass per 100 parts by mass of the cyclic olefin polymer (A).

3. The cyclic olefin polymer (A) is An addition polymer (A1) of a monomer having a norbornene ring and an α-olefin, which is represented by the following formula [I]: A ring-opening polymer of a monomer having a norbornene ring represented by the following formula [I] or a hydrogenated product thereof (A2) 3. The pipe for use in the production of electronic parts or for medical use according to claim 1 or 2, wherein 【Chemistry 1】 (In the above formula [I], n is 0 or 1, m is 0 or a positive integer, q is 0 or 1, and R 1 ~R 18 and R a and R b are each independently a hydrogen atom, a halogen atom or a hydrocarbon group, 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 With or R 17 and R 18 and may form an alkylidene group.)

4. 3. The pipe for electronic component production or medical use according to claim 1 or 2, wherein the soft copolymer (B) is an amorphous or low-crystalline soft copolymer obtained by copolymerizing ethylene with an α-olefin having 3 to 20 carbon atoms.

5. 3. The pipe for electronic component production or medical use according to claim 1, wherein the resin composition has a flexural modulus of 500 to 2100 MPa as measured in accordance with JIS K7171, and a tensile elongation at break of 20% or more as measured in accordance with JIS K7161.

6. 100 parts by mass of a cyclic olefin polymer (A) having a glass transition temperature of 60 to 200°C, 15 to 150 parts by mass of a soft copolymer (B) obtained by polymerizing at least two or more monomers selected from the group consisting of olefins, dienes, and aromatic vinyl hydrocarbons, and having a glass transition temperature of 0°C or lower; and A method for producing a pipe for manufacturing electronic parts or medical use, comprising melt-kneading a resin composition containing 0.001 to 1 part by mass of a radical initiator (C) and melt-molding the resulting resin composition.

7. The method for producing a pipe for manufacturing electronic components or medical use according to claim 6, wherein the resin composition is extrusion-molded.

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