JP6296433B2 - Biocompatible polymer, process for producing the same, and novel compound for producing the same - Google Patents

Description

  The present invention relates to a polymer production method mainly used for production of a polymer having biocompatibility and a polymer produced by the production method. More specifically, when it is placed in a living body or comes into contact with a substance derived from a living body, blood compatibility such as an anti-coagulant action and a target biological substance can be selectively adsorbed. The present invention relates to a novel production method capable of providing a polymer having a function, a polymer produced by the production method, and a novel compound used in the production method.

  Generally, when a biological component such as blood comes into contact with the surface of a medical material, the surface of the material is recognized as a foreign substance, and nonspecific adsorption, denaturation, multilayer adsorption, etc. of proteins in the biological tissue occur on the material surface. Activation of the coagulation system, complement system, platelet system, etc. For this reason, in order to prevent the medical instrument surface which is a contact interface with a biological body from being recognized as a foreign substance, it is desired to impart biocompatibility to the medical instrument surface. Specifically, in medical devices such as artificial lung devices, dialysis devices, blood storage bags, platelet storage bags, blood circuits, artificial hearts, indwelling needles, catheters, guide wires, stents, artificial blood vessels, endoscopes, blood, etc. It is desired that the portion that contacts the biological material has excellent biocompatibility.

  As a means for imparting biocompatibility to the surface of medical instruments, conventionally, materials that exhibit biocompatibility have been artificially synthesized and applied to the surfaces of various medical instruments to reduce the burden on the living body. Attempts have been made. Examples of such biocompatible materials include 2-methacryloyloxyethyl phosphorylcholine (MPC) polymer, polyethylene glycol (PEG), poly (2-methoxyethyl acrylate) (PMEA), polyalkoxyalkyl (meth) acrylamide ( Patent Document 1) and the like are known and have been put to practical use in various applications.

MPC polymer is a kind of betaine that maintains electrical neutrality in a living environment, and binds a phospholipid polar group covering a living cell membrane to a polymerizable group such as a vinyl group via an ester bond. Furthermore, it is a polymer produced by polymerizing the polymerizable group, and has a structure in which a phospholipid polar group is provided as a side chain with respect to an alkyl chain (main chain).
Polyethylene glycol (PEG) has a structure in which (C ₂ H ₄ —O), which is an ether structure, is a repeating unit, and is known to exhibit very excellent biocompatibility. However, since PEG itself is water-soluble, it needs to be used as a block copolymer or graft copolymer with another polymer for the purpose of imparting water resistance when used as a medical material. is there. On the other hand, poly (2-methoxyethyl acrylate) (PMEA) and the like are obtained by polymerizing a monomer in which a group mainly composed of an ether structure, which is a structural unit of PEG, is bonded to a vinyl group or the like to form an alkyl chain (main chain) On the other hand, it has a structure provided as a side chain having an ether structure as a main component. It has been clarified that by adopting such a structure, water resistance can be imparted by an alkyl chain while maintaining the biocompatibility exhibited by PEG.
Polyalkoxyalkyl (meth) acrylamide has an ether structure at the end of the side chain and has a structure with (meth) acrylamide as a repeating unit, and due to its moderate hydrophilicity, the activity of coagulation system, complement system and platelet system It has been found that it is possible to suppress oxidization and expresses excellent blood compatibility.

  Including MPC polymer having side chain containing phospholipid polar group with respect to alkyl chain (main chain), PEG composed of ether structure, PMEA which is polymer having side chain composed mainly of ether structure, and ether structure And a polymer material having a hydrophilic group (hereinafter simply referred to as “ether structure or the like”) such as an ether structure or an amide bond, such as polyalkoxyalkyl (meth) acrylamide having an amide bond. The reason for the high biocompatibility despite having a completely different structure from the above is not always clear. On the other hand, recent research has revealed that these polymers can contain water molecules in a state called “intermediate water” observed in biological materials (see, for example, Non-Patent Document 1). I want to be) That is, as described in the above document, a substance exhibiting biocompatibility can contain “intermediate water” regardless of whether it is a biologically derived substance or an artificial synthetic product. It has been experimentally shown that non-specific adsorption of proteins in living tissue is prevented by the presence of water molecules in the state of the substance on the surface of the substance, resulting in biocompatibility. In order for a given substance to contain “intermediate water”, it is not always necessary for the substance to have a structure suitable for containing “intermediate water” like PEG. It has been revealed that “intermediate water” can also be contained by providing a structure suitable for containing “water” as a side chain.

  The intermediate water contained in the biocompatible material is typically characterized by the release and absorption of unique latent heat seen during the heating process after supercooling. In other words, in the substance containing intermediate water, the release of latent heat is observed near −40 ° C. in the process of gradually cooling to about −100 ° C. and then gradually heating to near room temperature, or the latent heat is below −10 ° C. above freezing point. Absorption and absorption of specific latent heat is observed, such as the absorption of. Various verifications have revealed that the release and absorption of these latent heats is caused by the fact that a certain proportion of water molecules contained in the substance cause ordering and disordering. A molecule is defined as intermediate water. Intermediate water is presumed to be weakly constrained by specific effects from the molecules that make up the substance, but it has been shown that it is also contained in biological materials such as phospholipids in biological tissues. It is thought to be related to prevention of non-specific adsorption of proteins. In addition to the PMC polymer with phospholipid polar groups contained in the living body as side chains, intermediate water can also be contained in substances containing ether structures such as PEG, PMEA, and polyalkoxyalkyl (meth) alkylamides. This is considered to be related to the expression of biocompatibility.

［式中、Ｒ^１は、水素原子又はメチル基であり、Ｒ^２は、メチル基又はエチル基であり、ｍは２又は３であり、ｎは繰り返し数を示す］で表される繰り返し単位を有する高分子が開示されている。式（１）に示されるように、当該高分子はアルキル鎖に対して鎖状エーテル構造を含む側鎖を、エステル結合を介して結合させた構造を有している。 A polymer having a side chain including an ether structure such as the above PMEA has a simple structure and is easy to synthesize and exhibits water resistance, so that it is a biocompatible material applied to the surface of a medical device. Promising. As a polymer having a side chain containing an ether structure or the like, in addition to the above, for example, as a blood compatible material having both biocompatibility and temperature responsiveness in Patent Document 2, the following formula (1):

Wherein R ¹ is a hydrogen atom or a methyl group, R ² is a methyl group or an ethyl group, m is 2 or 3, and n represents the number of repeating units. Polymers having are disclosed. As shown in Formula (1), the polymer has a structure in which a side chain including a chain ether structure is bonded to an alkyl chain via an ester bond.

Patent Document 3 discloses a synthetic polymer having a structure in which a side chain portion containing a cyclic ether structure represented by the following structural formula (1) is bonded to an alkyl chain via an ester bond (polytetrahydroflurane). Furyl acrylate, PTHFA) is disclosed and described as having an inhibitory effect on platelet adhesion and activation.

In addition, the present inventor also uses an ether bond (—O—) instead of the above ester bond when a side chain containing a chain or cyclic ether structure is bonded to an alkyl chain. We have found that compatibility is being demonstrated and have filed a patent application.

Tanaka, M. et al., J. Biomat. Sci. Polym. Ed., 2010, 21, 1849-1863

Japanese Patent No. 4718766 Japanese Patent No. 4746984 Japanese Patent No. 4219154 JP 2012-105579 A

The biocompatible polymers such as PMC and PMEA described above have a structure in which a predetermined betaine structure or ether structure that contributes to biocompatibility is bonded as a side chain to a water-insoluble alkyl chain. Therefore, it is considered that the biocompatibility can be exhibited while being a water-insoluble polymer as a whole.
On the other hand, in the above polymer, as a production method thereof, a predetermined polymer is obtained by polymerizing a molecule in which a predetermined betaine structure or an ether structure is bonded to a polymerizable group such as a vinyl group. It was. For this reason, the density and position of the side chain provided in the alkyl chain constituting the main chain of the polymer obtained by the synthesis are limited by the structure of the vinyl group etc. used, and the degree of freedom of the synthesized polymer structure is not sufficient That was the problem. For example, when a polymer is synthesized using a vinyl group as a polymerizable group, it is easy to obtain a polymer in which a side chain is bonded to every other carbon atom in the carbon atom sequence forming the main chain, and the density of the side chain is changed. It has been difficult to perform operations such as controlling the position where the side chain is provided.
In order to solve the above problems, an object of the present invention is to provide a novel method for producing a biocompatible polymer in which the density and position of side chains provided for the main chain can be easily controlled. It is another object of the present invention to provide a novel biocompatible polymer produced by the production method and a medical device using the polymer. It is another object of the present invention to provide a novel compound used as a monomer in the above production method.

In order to solve the above problems, the present invention has the following features.
(1) A cyclic compound having a 4- to 13-membered cyclic structure having a carbon-carbon unsaturated bond, and a substituent containing a structure contributing to the inclusion of at least one intermediate water bonded to the cyclic structure A method for preparing a polymer, comprising a step of ring-opening polymerization to obtain a polymer.
(2) A method for preparing a polymer as described in (1) above, wherein a Grubbs catalyst is used in the ring-opening polymerization of the cyclic compound.
(3) The method further comprises a step of reducing at least part of unsaturated bonds contained in the main chain portion of the polymer composition obtained by ring-opening polymerization of the cyclic compound to form saturated bonds, Polymer preparation method.
(4) A polymer having a main chain including a string of carbon atoms bonded to each other, and a group including a structure that contributes to the inclusion of intermediate water as a side chain with respect to the main chain. And
The polymer, wherein the column of carbon atoms includes a portion in which two or more carbon atoms to which side chains are not bonded are continuously present.
(5) In the carbon atom contained in the polymer main chain, the ratio of the carbon atom to which the side chain containing the structure contributing to the inclusion of the intermediate water is bonded is less than 1/2 (4) ).
(6) The polymer as described in any one of (4) and (5) above, wherein the position specificity of a side chain containing a structure contributing to the inclusion of intermediate water is 90% or more.
(7) A composition comprising the polymer according to any one of (4) to (6) above.
(8) The composition as described in (7) above, which is used as a medical material.
(9) A device using at least a part of the composition according to (7) or (8).
(10) It has a 4- to 13-membered cyclic structure having a carbon-carbon unsaturated bond, and a substituent containing a structure contributing to the inclusion of at least one intermediate water is bonded to the cyclic structure. A cyclic compound.
(11) The cyclic compound according to (10) above, wherein the number of carbon-carbon unsaturated bonds contained in the cyclic compound is 1 or 2.
(12) The cyclic compound according to any one of (10) or (11) above, wherein the substituent containing a structure contributing to the inclusion of the intermediate water is a substituent containing an ether structure.
(13) The cyclic compound according to (12) above, wherein the ether structure includes at least one of cyclic ether and chain ether.
(14) The above-mentioned (10) or (11), wherein the substituent containing a structure contributing to the inclusion of the intermediate water is a substituent containing betaine that is electrically neutral in a living environment. The cyclic compound as described in any one.
(15) The cyclic compound according to (14) above, wherein the betaine that is electrically neutral in the biological environment is any one of phosphobetaine, carboxybetaine, and sulfobetaine.
(16) The cyclic compound as described in any one of (10) to (15) above, which is used as a monomer for ring-opening polymerization.

  According to the production method of the present invention, a biocompatible polymer having a side chain density and a side chain arrangement, which has been difficult to realize in the past, can be easily synthesized, and a novel biocompatible suitable for various uses. It is possible to provide a functional polymer and a medical instrument using the same.

1 is a diagram showing ¹ H-NMR and ¹³ C-NMR spectra of 3-methoxy-1-cyclooctene obtained in Example 1. FIG. 2 is a diagram showing ¹ H-NMR and ¹³ C-NMR spectra of 3- (2-methoxyethoxy) -1-cyclooctene obtained in Example 2. FIG. 4 is a diagram showing ¹ H-NMR and ¹³ C-NMR spectra of 3- (2-methoxyethoxycarbonyl) -1-cyclooctene obtained in Example 3. FIG. 2 is a diagram showing ¹ H-NMR and ¹³ C-NMR spectra of 3- [2- (2-methoxyethoxy) ethoxy] -1-cyclooctene obtained in Example 4. FIG. It is a figure which shows the < ¹ > H-NMR and < ¹³ > C-NMR spectrum of the 3-methoxy-1-cyclooctene polymer obtained by (1) of Example 5. FIG. It is a figure which shows the < ¹ > H-NMR and < ¹³ > C-NMR spectrum of the hydrogenated 3-methoxy-1-cyclooctene polymer obtained in (2) of Example 5. It is a figure which shows the < ¹ > H-NMR and < ¹³ > C-NMR spectrum of the 3- (2-methoxyethoxy) -1-cyclooctene polymer obtained by (1) of Example 6. FIG. It is a figure which shows the < ¹ > H-NMR and < ¹³ > C-NMR spectrum of the hydrogenated 3- (2-methoxyethoxy) -1-cyclooctene polymer obtained by (2) of Example 6. FIG. It is a figure which shows the < ¹ > H-NMR and < ¹³ > C-NMR spectrum of the 3- (2-methoxyethoxycarbonyl) -1-cyclooctene polymer obtained by (1) of Example 7. FIG. It is a figure which shows the < ¹ > H-NMR and < ¹³ > C-NMR spectrum of the hydrogenated 3- (2-methoxyethoxycarbonyl) -1-cyclooctene polymer obtained by (2) of Example 7. FIG. It is a figure which shows the < ¹ > H-NMR and < ¹³ > C-NMR spectrum of 3- [2- (2-methoxyethoxy) ethoxy] -1-cyclooctene polymer obtained by (1) of Example 8. FIG. It is a figure which shows the < ¹ > H-NMR and < ¹³ > C-NMR spectrum of the hydrogenation 3- [2- (2-methoxyethoxy) ethoxy] -1-cyclooctene polymer obtained by (2) of Example 8. FIG. It is a figure which shows the DSC chart of the water-containing sample of the polymer obtained by (1) of Example 5. FIG. It is a figure which shows the DSC chart of the water-containing sample of the polymer obtained by (2) of Example 5. FIG. It is a figure which shows the DSC chart of the water-containing sample of the polymer obtained by (1) of Example 6. FIG. It is a figure which shows the DSC chart of the water-containing sample of the polymer obtained by (2) of Example 6. FIG. It is a figure which shows the DSC chart of the water-containing sample of the polymer obtained by (1) of Example 7. It is a figure which shows the DSC chart of the water-containing sample of the polymer obtained by (2) of Example 7. It is a figure which shows the DSC chart of the water-containing sample of the polymer obtained by (1) of Example 8. It is a figure which shows the DSC chart of the water-containing sample of the polymer obtained by (2) of Example 8. It is a figure which shows the DSC chart of the water-containing sample of the polycyclooctene polymer of the comparative example 1. 3 is a diagram showing a DSC chart of a water-containing sample of a hydrogenated polycyclooctene polymer of Comparative Example 1. FIG.

Definition of Terms In the present invention, the following terms apply regardless of whether they appear alone or in combination.

  In this specification, the term “lower alkyl” refers to a monovalent saturated hydrocarbon group containing a straight or branched carbon chain having 1 to 6 carbon atoms. Examples of lower alkyl include, but are not limited to, methyl, ethyl, propyl, i-propyl, n-butyl, i-butyl, tert-butyl, pentyl, hexyl and the like.

The term “lower alkylene” refers to a divalent saturated hydrocarbon group comprising a straight or branched carbon chain having 1 to 6 carbon atoms. Examples of lower _{alkylene, -CH 2 -, - CH 2} CH 2 -, - CH (CH 3) -, - CH 2 CH 2 CH 2 -, - CH 2 (CH 2) 2 CH 2 -, - CH 2 _{(CH) (CH 3) CH} 2 -, - CH (CH 3) CH (CH 3) -, - CH 2 (CH 2) 3 CH 2 -, - and the like _{- CH 2 (CH 2) 4} CH 2 However, it is not limited to these.

The term “cyclic compound containing a carbon-carbon unsaturated bond” refers to an unsaturated, non-aromatic, aliphatic cyclic hydrocarbon having a double or triple bond in the ring. The cyclic compound containing a carbon-carbon unsaturated bond is a cycloalkene having a carbon-carbon double bond, a cycloalkyne having a carbon-carbon triple bond, or the like, and can contain an oxygen atom or the like in a part of the ring. . In the cyclic compound containing a carbon-carbon unsaturated bond, the term “number of ring members” refers to the total number of carbon atoms and oxygen atoms forming the cyclic skeleton. Examples of cycloalkenes are cyclopropene (C ₃ H ₄ ), cyclobutene (C ₄ H ₆ ), cyclopentene (C ₅ H ₈ ), cyclohexene (C ₆ H ₁₀ ), cycloheptene (C ₇ H ₁₂ ), cyclooctene ( Including, but not limited to, C ₈ H ₁₄ ), cyclononene (C ₉ H ₁₆ ), 1,3-cyclooctadiene (C ₈ H ₁₂ ), 1,5-cyclooctadiene (C ₈ H ₁₂ ), and the like. . Examples of cycloalkynes include cyclobutyne (C ₄ H ₄ ), cyclopentine (C ₅ H ₆ ), cyclohexine (C ₆ H ₈ ), cycloheptin (C ₇ H ₁₀ ), cyclooctyne (C ₈ H ₁₂ ), and the like. However, it is not limited to these.

  The term “monomer” or “monomer” refers to a low molecular weight molecule that can be used interchangeably and can be a component of the basic structure of a polymer. The monomer usually has a functional group that becomes a reaction point of the polymerization reaction, such as a carbon-carbon double bond.

  The term “polymer” or “polymer” refers to a molecule having a structure composed of repeating monomer units, which can be used interchangeably and can be obtained from a monomer having a low molecular weight. The term “polymer” refers to a macromolecule formed by covalently bonding a large number of atoms, such as a protein, a nucleic acid and the like, in addition to a polymer.

  In the polymer, the term “average degree of polymerization” refers to the average number of monomer units contained in one polymer molecule. That is, in the polymer composition, polymer molecules having different lengths are dispersed within a certain range.

  Regarding the degree of polymerization of the polymer, the “number average molecular weight” means the average molecular weight per molecule in the polymer composition, and the “weight average molecular weight” means the molecular weight calculated by weighting the weight. Further, the ratio between the number average molecular weight and the weight average molecular weight is referred to as the degree of dispersion, which is a measure of the molecular weight distribution of the polymer composition. The closer the degree of dispersion is to 1, the closer the average degree of polymerization in the polymer composition and the more polymer chains of the same length.

  In the present invention, the term “biocompatible material” refers to a material that is capable of containing intermediate water and that is less likely to be recognized as a foreign substance when it comes into contact with a biological substance while exhibiting a target function. Biocompatible materials include, for example, materials that do not have biological activity such as complement activity, thrombotic activity, and tissue invasiveness, and materials that exhibit biological activity such as inducing specific protein adsorption and cell adhesion. Including. In the present invention, the term “blood compatible material” refers to a material that does not cause blood coagulation.

  In the method for producing a polymer according to the present invention, a cyclic compound containing a carbon-carbon unsaturated bond to which a group containing a structure contributing to the inclusion of intermediate water such as an appropriate betaine structure or an ether structure is bonded is used as a monomer. It includes a step of generating a chain polymer having a group including a structure that contributes to the inclusion of intermediate water as a side chain by ring-opening polymerization of cyclic compounds. By producing a polymer by such a polymerization method, the ring compound of the cyclic compound is ring-opening polymerized by appropriately determining the bonding position and number of groups including the ring structure of the cyclic compound and the ether structure bonded to the cyclic compound in advance. In the chain polymer thus obtained, it is possible to determine the arrangement and density of the side chain composed of a group including a structure that contributes to the inclusion of intermediate water. As a result, compared to the case where a conventional vinyl group or the like is used as a polymerizable group, the density and arrangement of side chains composed of groups including a structure that contributes to the inclusion of intermediate water in the synthesized polymer The degree of freedom can be improved.

  In a polymer having an alkyl chain as a main chain and particularly a side chain composed of a group containing an ether structure or the like, the side chain portion generally exhibits water solubility and contributes to retention of intermediate water. Thus, it is understood that the water-resistant main chain ensures the water resistance of the polymer as a whole, and can be used as a structural material or a coating. For this reason, it is considered that the polymer production method according to the present invention improves the density of the side chains relative to the main chain and the degree of freedom in arrangement, thereby facilitating the provision of biocompatible polymers suitable for various applications. It is done.

  In the method for producing a polymer according to the present invention, the cyclic compound used for polymerizing the polymer has any cyclic structure from a 4-membered ring to a 13-membered ring and an unsaturated bond between carbon-carbon atoms. Thus, those that cause good ring-opening polymerization are used. The method of ring-opening polymerization is not particularly limited, but ring-opening metathesis polymerization reaction (ROMP) can be preferably used in that a regular side chain arrangement can be realized in the polymer obtained by polymerization. The ring-opening metathesis polymerization is a polymerization reaction using a cycloalkene as a monomer, and is a chain polymerization reaction that proceeds by a continuous ring-opening metathesis reaction between a monomer and a transition metal carbene complex that is a catalyst. The ring-opening metathesis polymerization is described in detail in, for example, Christopher W. Bielawski, Robert H. Grubbs, Prog. In Poly. Sci., 32 (2007), 1-29, etc., which is incorporated herein by reference. Incorporated into.

  In the method for producing a polymer according to the present invention, an unsaturated bond contained in a cyclic compound, which is a monomer, is generally opened by cleavage, and the cleaved residue present at both ends of the other opened monomer. It is considered that a polymer in which a portion of a cyclic structure is bonded to each other by a saturated bond is formed in a chain by unsaturated bonds. Any method can be used for producing the polymer according to the present invention as long as it is a method of opening a cyclic compound to form a chain polymer, without being limited to ring-opening metathesis polymerization.

  According to ring-opening metathesis polymerization, ring-opening polymerization at one of the unsaturated bonds can be selectively performed on a cyclic compound having an unsaturated bond between two carbons by selecting a catalyst to be used. Such cyclic compounds can also be used for the production of the polymer according to the present invention. Moreover, the regularity of the position of the side chain with respect to the main chain can be controlled by controlling the bonding direction between the chain monomers generated by ring opening.

  In addition, according to ring-opening metathesis polymerization, ring-opening polymerization with an unsaturated bond between carbons is possible for cyclic compounds containing heteroatoms such as oxygen, nitrogen, and phosphorus. It becomes possible to perform ring-opening polymerization using a cyclic compound. In the present invention, in particular, by using a cyclic compound having an oxygen atom in the cyclic structure, an ether bond can be introduced into the main chain portion of the polymer obtained by polymerization, which contributes to the expression of biocompatibility. Can do.

  In general, unsaturated bonds between carbon atoms generated during polymerization remain in the main chain portion of the polymer obtained by ring-opening polymerization. For such an unsaturated bond, hydrogen or an appropriate functional group can be added by an appropriate method depending on the use of the polymer. By adding hydrogen or an appropriate functional group, it is possible to eliminate the unsaturated bond to improve the chemical stability of the polymer and to provide various functions. In particular, it is also possible to add a group containing an ether structure to the unsaturated bond portion.

  In the method for producing a polymer according to the present invention, the group bonded to the cyclic portion of the cyclic compound that is a monomer in polymerization is a portion constituting a side chain with respect to the main chain portion of the produced polymer. As is known in the art, a group containing a structure that contributes to the inclusion of intermediate water, such as an electrically neutral betaine or ether structure in a biological environment, is located on the side of the main chain composed mainly of an alkyl chain. By providing it as a chain, it is possible to obtain a polymer that can achieve both high biocompatibility and water resistance.

  In the present invention, as a mode for introducing a group containing a structure that contributes to the inclusion of intermediate water into the cyclic portion of the cyclic compound, in addition to bonding the group to a carbon atom constituting the cyclic structure, a nitrogen atom in the cyclic structure Etc. may be introduced and the group may be bonded thereto. In the present invention, the group introduced into the cyclic part of the cyclic compound is not particularly limited as long as it has a structure that contributes to the inclusion of intermediate water, but typically it has an ether structure, or in a biological environment. Examples include electrically neutral betaine.

  The group containing an ether structure introduced into the cyclic part of the cyclic compound may be a group having at least one ether bond (—O—). Examples of the simplest structure include an ether in the cyclic part of the cyclic compound. The thing which couple | bonded the methyl group through the coupling | bonding is mentioned. On the other hand, in order to improve the amount of intermediate water that can be contained as a whole polymer, it is generally preferable to use a chain ether structure containing a plurality of ether bonds or a group containing a cyclic ether structure. In addition, the group containing an ether structure or the like includes an alkylene group, an alkyl group, a hydrogen atom having a relatively low molecular weight within a range that does not inhibit biocompatibility, and a crosslinking group that binds these to the cyclic portion of the cyclic compound. Thus, it is possible to stabilize the structure and facilitate manufacture.

一般式（Ａ）において、Ｒ５はＣ１〜４の直鎖又は分岐のアルキレン基であり、好ましくは、Ｒ^５はＣＨ_２、Ｃ_２Ｈ_４、Ｃ_３Ｈ_６又はＣ_４Ｈ_８のいずれかを意味する。また、Ｒ^６はＨ又はＣ１〜４の直鎖又は分岐のアルキル基であり、好ましくは、Ｒ^６はＨ、ＣＨ_３、Ｃ_２Ｈ_５、Ｃ_３Ｈ_７又はＣ_４Ｈ_９のいずれかを意味する。ｍは１〜１０の自然数であり、好ましくは１〜４の範囲内にあり、より好ましくは１又は２である。ここで、（Ｒ^５−Ｏ）の部分が、ＰＥＧ等の単位構造であるエーテル構造を示す部分である。
本発明で使用される環状化合物においては、エーテル構造等を含む基として、一般式（Ａ）におけるＲ^５、Ｒ^６、及びｍ値が相互に異なる基を含むことができる。つまり、本発明で使用される環状化合物においては、末端を水素又はアルキル基で終端したモノエーテル（ｍ＝１）、又はポリエーテル（ｍ≧２）を有することができる。例えば、Ｒ^５がＣ_２Ｈ_４の場合には、ＰＥＧの構成単位である鎖状エーテル（Ｃ_２Ｈ_４−Ｏ）をアルキル基等で終端し、架橋基により環状構造に結合した構造を有する。
一般式（Ａ）において、Ｒ^５を成すアルキレン鎖が短いほど親水性が高まる傾向が見られる一方で、Ｒ^５がＣ_５Ｈ_１０以上の場合には疎水性が高まり中間水の保持が困難になる。また、Ｒ^５とＯの結合で構成されるアルキルオキサイドの部分は１単位（ｍ＝１）でもよく、複数単位でもよい。Ｒ^５の構造を一定とした場合、ｍの値が大きい場合には側鎖部分のポリエーテルとしての性格が強まり、水溶性が高まる傾向が見られる。高分子化合物中における一般式（Ａ）で表される繰返し単位の密度が高い場合には、ｍ≦４程度が好ましいが、当該密度が低い場合にはｍ≦１０程度であれば高分子化合物が充分な耐水溶性を有する。一般式（Ａ）で表される繰返し単位において、ｍ≧２の場合には、それぞれの単位に含まれるＲ^５として異なる長さのアルキル鎖を用いることができる。また、本発明の高分子化合物においては、分子内でｍ値が相互に異なる繰返し単位を含むことができる。
一般式（Ａ）において、Ｒ^６としては、Ｈ、ＣＨ_３、Ｃ_２Ｈ_５、Ｃ_３Ｈ_７又はＣ_４Ｈ_９を選択することができる。Ｒ^６は、本発明により製造されるポリマーの側鎖部分を終端する部分であり、この部分の違いによっても側鎖部分の疎水性等を調整することができる。特にＲ^６として水素を選択し、側鎖の先端をヒドロキシ基とすることで親水性を向上することができる。
また、一般式（Ｂ）においては、Ｒ^８Ｏ_ｋは３員環から６員環のうちのいずれかの環状エーテルであって、環状エーテルに含まれる酸素原子の数（ｋ）は、ｋ≧１である。また、本発明においては、Ｒ^７、Ｒ^８に含まれる任意の水素が−ＯＨ、ＣＨ_３、Ｃ_２Ｈ_５の少なくともいずれか一つで置換されたものを含むものとする。また、Ｒ^７は環状エーテルを含む構造を安定とするために、ＣＨ_２又はＣ_２Ｈ_４のいずれかから選択されるアルキレン基が選択される。つまり、一般式（Ｂ）で示される基は、環状エーテルを所定のアルキレン基を介して主鎖に対して架橋基により結合した構造を有する。
Ｒ^７を介在させずにＲ^８Ｏ_ｋで示される環状エーテルを成す炭素原子と架橋基の結合を形成しようとした場合には、環状エーテルが不安定となって不安定となる傾向がみられる。一方、Ｒ^７として長い炭素鎖を導入した場合には疎水性が高まり、良好な生体適合性の発現が困難になるため、Ｒ^７として、ＣＨ_２、Ｃ_２Ｈ_４を用いることが好ましい。また、Ｒ^７の部分に含まれる任意の水素原子を−ＯＨ、ＣＨ_３、Ｃ_２Ｈ_５の少なくともいずれかで置換することにより、親水性／疎水性の程度を調整することができるため、重合されるポリマーの使用目的に応じて適宜の置換を行うことができる。
一般式（Ｂ）で表される繰返し単位の側鎖部分においてＲ^８Ｏ_ｋで示される環状エーテル部分は、７員環以上の環状エーテルを用いた場合には構造が不安定になるため、３員環から６員環のいずれか環状エーテルであることが望ましい。環状エーテルに含まれる酸素原子の数や位置は、環状エーテルが安定に存在する範囲内で適宜設定することができる。例えば、３員環の場合には、存在する２個の炭素原子間に１個の酸素原子（ｋ＝１）が存在する構造が一意に決定されるが、５員環の場合には、１又は２個の酸素原子（ｋ＝１，２）を相互に隣接しない任意の位置に含むことができる。また、Ｒ^８の部分に含まれる任意の水素原子を−ＯＨ、ＣＨ_３、Ｃ_２Ｈ_５で置換することにより、親水性／疎水性の程度を調整することができるため、重合されるポリマーの使用目的に応じて適宜の置換を行うことができる。 From the viewpoint of the amount of intermediate water that can be contained and the stability as a substance, the group containing an ether structure or the like used in the present invention has the following general formula as a structure that has so far been observed to contribute to biocompatibility. The thing shown by these is mentioned preferably.

In formula (A), R5 is a linear or branched alkylene group of C1 -4, preferably, one of ^{R 5} is _{CH 2, C 2 H 4,} C 3 H 6 or _C 4 _{H 8} means. R ⁶ is H or a C1-4 linear or branched alkyl group, preferably R ⁶ is H, CH ₃ , C ₂ H ₅ , C ₃ H ₇ or C ₄ H _9. means. m is a natural number of 1 to 10, preferably in the range of 1 to 4, more preferably 1 or 2. Here, the portion of (R ⁵ —O) is a portion showing an ether structure which is a unit structure such as PEG.
In the cyclic compound used in the present invention, R ⁵ , R ⁶ , and m values in the general formula (A) may be different from each other as a group containing an ether structure or the like. That is, the cyclic compound used in the present invention can have a monoether (m = 1) or a polyether (m ≧ 2) terminated with hydrogen or an alkyl group. For example, when R ⁵ is C ₂ H ₄ , it has a structure in which a chain ether (C ₂ H ₄ -O), which is a structural unit of PEG, is terminated with an alkyl group or the like and bonded to a cyclic structure by a crosslinking group .
In the general formula (A), the shorter the alkylene chain constituting R ⁵ , the higher the hydrophilicity is observed. On the other hand, when R ⁵ is C ₅ H ₁₀ or more, the hydrophobicity increases and it becomes difficult to hold the intermediate water. Become. Further, the alkyl oxide moiety constituted by the bond of R ⁵ and O may be one unit (m = 1) or a plurality of units. When the structure of R ⁵ is constant, when the value of m is large, the character of the side chain moiety as a polyether is strengthened, and the water solubility tends to increase. When the density of the repeating unit represented by the general formula (A) in the polymer compound is high, m ≦ 4 is preferable, but when the density is low, the polymer compound is about m ≦ 10. Has sufficient water resistance. In the repeating unit represented by the general formula (A), when m ≧ 2, alkyl chains having different lengths can be used as R ⁵ contained in each unit. In the polymer compound of the present invention, repeating units having different m values in the molecule can be contained.
In the general formula (A), as R ⁶ , H, CH ₃ , C ₂ H ₅ , C ₃ H ₇ or C ₄ H ₉ can be selected. R ⁶ is a portion that terminates the side chain portion of the polymer produced according to the present invention, and the hydrophobicity and the like of the side chain portion can be adjusted by the difference in this portion. In particular, hydrophilicity can be improved by selecting hydrogen as R ⁶ and making the side chain tip a hydroxy group.
In the general formula (B), R ⁸ O _k is a cyclic ether of any one of a 3-membered ring to a 6-membered ring, and the number (k) of oxygen atoms contained in the cyclic ether is k ≧ 1. In the present invention, it is intended to include those in which any hydrogen contained in R ⁷ and R ⁸ is substituted with at least one of —OH, CH ₃ , and C ₂ H ₅ . Further, R ⁷ is an alkylene group selected from either CH ₂ or C ₂ H ₄ in order to stabilize the structure containing a cyclic ether. That is, the group represented by the general formula (B) has a structure in which a cyclic ether is bonded to the main chain via a predetermined alkylene group via a crosslinking group.
When an attempt is made to form a bond between a carbon atom forming a cyclic ether _represented by R ⁸ O _k and a bridging group without interposing R ⁷ , the cyclic ether tends to be unstable and unstable. . On the other hand, when a long carbon chain is introduced as R ⁷ , the hydrophobicity increases and it becomes difficult to express good biocompatibility. Therefore, it is preferable to use CH ₂ or C ₂ H ₄ as R ⁷ . Moreover, since the degree of hydrophilicity / hydrophobicity can be adjusted by substituting at least one of —OH, CH ₃ , and C ₂ H ₅ for any hydrogen atom contained in R ⁷ , polymerization Depending on the intended purpose of the polymer to be used, appropriate substitution can be performed.
The cyclic ether portion represented by R ⁸ O _k in the side chain portion of the repeating unit represented by the general formula (B) has an unstable structure when a 7-membered or higher cyclic ether is used. It is desirable that it is any cyclic ether of a member ring to a 6-member ring. The number and position of oxygen atoms contained in the cyclic ether can be appropriately set within a range in which the cyclic ether is stably present. For example, in the case of a three-membered ring, a structure in which one oxygen atom (k = 1) exists between two existing carbon atoms is uniquely determined. Alternatively, two oxygen atoms (k = 1, 2) can be included at any position not adjacent to each other. Moreover, since the degree of hydrophilicity / hydrophobicity can be adjusted by substituting any hydrogen atom contained in R ⁸ with —OH, CH ₃ , C ₂ H ₅ , Depending on the purpose of use, appropriate substitution can be performed.

  In the general formula (A) or (B), the bridging group represented by A is a part that bonds a part mainly composed of an ether structure to a cyclic structure. In order for the ether structure to contain intermediate water, it is becoming clear that it is necessary to maintain a specific high molecular mobility, and that the crosslinking group is difficult to inhibit the molecular mobility. desirable. Specifically, it is preferable to use a lower alkylene group having 1 to 6 carbon atoms as A. On the other hand, from the viewpoint of easy synthesis of a cyclic compound as a monomer, A represents an ester structure (—C (═O) O—), an ether structure (—O—), an amide structure (—C (═O) NH. It is convenient to adopt-).

（上記式において、Ｒ^ａ及びＲ^ｄは、各々独立して、低級アルキレン基であり、Ｒ^ｂ及びＲ^ｃは、各々独立して、低級アルキル基である） As the group containing betaine which is preferably introduced into the cyclic part of the cyclic compound and which is electrically neutral in the living environment, phosphobetaine, carboxybetaine, sulfobetaine and the like are generally known. That is, for example, those having the structures represented by the following general formulas (C) to (E) included in these groups are introduced into the cyclic portion by an appropriate bonding mode using a crosslinking group, an alkylene group or the like. Can be used.

(In the above formula, R ^a and R ^d are each independently a lower alkylene group, and R ^b and R ^c are each independently a lower alkyl group)

式中、下記：

で表される部分は、炭素原子間の不飽和結合であり、Ｒ^１、Ｒ^２、Ｒ^３ｎ及びＲ^４ｎのうちの少なくとも一つは中間水の含有に寄与する構造等を含む基である。また、ｎは１〜１０の整数であることにより、環状構造は４員環から１３員環のいずれかである。また、上記に明示される不飽和結合の他にもうひとつの不飽和結合を含むことができる。更に、上記のように、環状構造の一部に酸素原子、窒素原子等のヘテロ原子を、ヘテロ原子同士が隣接しない位置に含むことができる。 Of the structure of the cyclic compound used in the present invention described above, the case where the cyclic structure is composed of carbon atoms is represented by the following general formula (I).

Where:

Is a unsaturated bond between carbon atoms, and at least one of R ¹ , R ² , R ³ⁿ and R ⁴ⁿ is a group including a structure that contributes to the inclusion of intermediate water. Further, n is an integer of 1 to 10, so that the cyclic structure is either a 4-membered ring or a 13-membered ring. In addition to the unsaturated bond specified above, another unsaturated bond may be included. Furthermore, as described above, a hetero atom such as an oxygen atom or a nitrogen atom can be included in a part of the ring structure at a position where the hetero atoms are not adjacent to each other.

  In particular, the number of ring members is 4, 5 from the viewpoint of being obtained in good yield when synthesizing the compound of formula (I) and the reactivity when the cyclic compound is used as a monomer for the ring-opening metathesis polymerization reaction. 7 or 8 is more preferable. In one embodiment of the present invention, the number of ring members is 5, 7 or 8 (n = 2, 4 or 5), and in another embodiment, the number of ring members is 7 or 8 (n = 4 or 5). In yet another embodiment, a cyclic compound comprising a carbon-carbon unsaturated bond having 12 ring members (n = 9) is provided. Among them, a cyclic compound containing a carbon-carbon unsaturated bond having 8 ring members, that is, n being 5 is most preferable.

  In the cyclic compound of the formula (I), the position and number of substituents that contribute to the inclusion of intermediate water containing a predetermined betaine or ether structure as a substituent are determined according to the position of the side chain in the polymer produced according to the present invention. It is important in determining the arrangement, and is determined according to the properties required for the polymer. Generally, when there are many said substituents, while the quantity of the intermediate water which the polymer obtained by superposition | polymerization can contain becomes large, there exists a tendency for the water resistance of a polymer to fall. On the other hand, by reducing the number of the substituents, the amount of intermediate water that can be contained in the polymer is reduced, and a property of adsorbing specific proteins and cells can be imparted. That is, the substituent can be provided at a position other than the carbon atom that forms the unsaturated bond, but is appropriately substituted from the viewpoint of appropriately adjusting the water resistance as a polymer and the amount of intermediate water that can be contained. The density and arrangement of groups can be determined. In particular, in the polymer to be polymerized, it is also preferable that the upper limit of substituents bonded to each carbon atom in the cyclic compound of formula (I) is one in order to make one side chain provided for each carbon atom. .

  In particular, when ring-opening polymerization using a Grubbs catalyst is performed, at least one of the substituents should be present at the allylic position (position 3) in order to improve the regularity of the side chain arrangement in the obtained polymer. Most preferably, a highly ordered polymer can be obtained by providing one substituent only at the allylic position. In other preferred embodiments, the substituents can be present in multiple numbers at the 3, 4 and 5 positions, 3, 5 and 7 positions, or 3 and 5 positions of the cycloalkene ring.

  In the polymerization of the polymer according to the present invention, it is possible to form a copolymer by random polymerization, block polymerization, graft polymerization, etc., using cyclic compounds having different number of members, substituent structure, substituent density, etc. It can be carried out as appropriate according to the use of the polymer obtained by polymerization.

Examples of the cyclic compound preferably used for polymerization in the present invention include the following:
3- (2-methoxyethyloxycarbonyl) -1-cyclooctene,
3- (2-methoxyethylaminocarbonyl) -1-cyclooctene,
3- (2-methoxyethyloxy) -1-cyclooctene,
3-{(2-methoxyethyloxy) -methyl} -1-cyclooctene,
3- {2- (tetrahydrofuran-2-ylmethyl-oxy) -ethyloxycarbonyl} -1-cyclooctene,
3- {2- (tetrahydrofuran-3-ylmethyl-oxy) -ethyloxycarbonyl} -1-cyclooctene,
3- {2- (tetrahydrofuran-2-ylmethyl-oxy) -ethylaminocarbonyl} -1-cyclooctene,
3- {2- (tetrahydrofuran-3-ylmethyl-oxy) -ethylaminocarbonyl} -1-cyclooctene,
However, it is not limited to these.

（式中、ｎ、ｘは、それぞれ独立して、１〜１０の自然数であり、Ｒは、上記Ｒ^６と同義である）
まず炭素原子間の不飽和結合が存在する不飽和環状化合物を、窒素雰囲気下、四塩化炭素のような適切な溶媒中で、アゾビスイソブチロニトリル（ＡＩＢＮ）の存在下、例えばＮ−ブロモスクシンイミドのような臭素化試薬と反応させ、ブロモ化した不飽和環状化合物を得る。これをさらに適切なアルコール（例えば、２−メトキシエタノール等）と反応させることにより、Ａが−Ｏ−であるような式（Ｉ）の化合物を得る。不飽和環状化合物と臭素化試薬との反応では、ラジカル開始剤を用いることができる。ラジカル開始剤の例は、ＡＩＢＮ、過酸化ベンゾイル等が挙げられるが、これらに限定されない。不飽和環状化合物と臭素化試薬との反応に用いられる溶媒は、例えば四塩化炭素、ジクロロメタン、クロロホルム等が挙げられるが、これらに限定されない。不飽和環状化合物と臭素化試薬との反応を行う温度は、室温から溶媒の沸点までの温度範囲をとることができ、還流条件下で行うことが好ましい。臭素化した不飽和環状化合物とアルコールとの反応では、溶媒を用いることもできるが、不飽和環状化合物に導入するアルコール基の母体となるアルコールが液体である場合、前記アルコールそのものを溶媒として用いることもできる。 In the above formula (I), a compound in which the bridging group A is an ether bond (—O—) can be prepared, for example, according to the following scheme 1.

(In the formula, n and x are each independently a natural number of 1 to 10, and R has the same meaning as R ⁶ above).
First, an unsaturated cyclic compound in which an unsaturated bond between carbon atoms exists is converted into an appropriate solvent such as carbon tetrachloride in a nitrogen atmosphere in the presence of azobisisobutyronitrile (AIBN), for example, N-bromo. Reaction with a brominating reagent such as succinimide provides a brominated unsaturated cyclic compound. This is further reacted with an appropriate alcohol (for example, 2-methoxyethanol or the like) to obtain a compound of the formula (I) in which A is —O—. In the reaction between the unsaturated cyclic compound and the bromination reagent, a radical initiator can be used. Examples of radical initiators include, but are not limited to, AIBN, benzoyl peroxide, and the like. Examples of the solvent used for the reaction between the unsaturated cyclic compound and the bromination reagent include, but are not limited to, carbon tetrachloride, dichloromethane, chloroform, and the like. The temperature at which the unsaturated cyclic compound and the brominating reagent are reacted can range from room temperature to the boiling point of the solvent, and is preferably performed under reflux conditions. In the reaction of the brominated unsaturated cyclic compound with the alcohol, a solvent can be used. However, when the alcohol serving as a base of the alcohol group to be introduced into the unsaturated cyclic compound is a liquid, the alcohol itself is used as the solvent. You can also.

（式中、ｎ、ｘ、Ｒは、上記定義のとおりである）
まず非置換の不飽和環状化合物を、トルエンのような適切な溶媒中、ニンヒドリンと加熱還流することにより、３−位を（２−ヒドロキシ−１，３−インダンジオン−２−イル）基で置換した不飽和環状化合物を得る。これをさらに、過ヨウ素酸で処理した後、例えば硫酸のような酸の存在下で、適切なアルコール（例えば、２−メトキシエタノール）と反応させることにより、Ａが−Ｃ（＝Ｏ）Ｏ−であるような式（Ｉ）の化合物を得る。ニンヒドリンとの反応に用いられる溶媒は、例えばトルエン、キシレン等のような高沸点の溶媒が挙げられるが、これらに限定されない。ニンヒドリンとの反応を行う温度は、室温から溶媒の沸点までの温度範囲をとることができるが、反応の進行により生成する水を溶媒との共沸によって除去することができる温度の範囲、例えば水の沸点以上で行うことが好ましい。 In the above formula (I), a compound in which the bridging group A is an ester bond (—C (═O) O—) can be prepared, for example, according to the following scheme 2.

(Where n, x and R are as defined above)
First, an unsubstituted unsaturated cyclic compound is heated and refluxed with ninhydrin in a suitable solvent such as toluene, thereby substituting the 3-position with a (2-hydroxy-1,3-indandion-2-yl) group. The obtained unsaturated cyclic compound is obtained. This is further treated with periodic acid and then reacted with a suitable alcohol (eg, 2-methoxyethanol) in the presence of an acid such as sulfuric acid, so that A is —C (═O) O—. To obtain a compound of formula (I) such that Examples of the solvent used for the reaction with ninhydrin include, but are not limited to, high-boiling solvents such as toluene and xylene. The temperature at which the reaction with ninhydrin is carried out can be in the temperature range from room temperature to the boiling point of the solvent, but the temperature range in which water produced by the progress of the reaction can be removed by azeotropy with the solvent, for example, water It is preferable to carry out at a boiling point or higher.

（式中、ｎ、ｘ、Ｒは、上記定義のとおりであり、Ｘは、ハロゲンである）
まず、モノマー上の置換基の母体となるアルコールＨＯ（ＣＨ_２ＣＨ_２Ｏ）_ｘＲを適切なハロゲン化試薬によりハロゲン化し、次いでフタルイミドカリウムで処理し、さらに加水分解することで、第１級アミンを得る。また、上記スキーム２に従って得られる不飽和環状化合物のカルボン酸を、例えば塩化チオニルで処理することにより、カルボン酸クロリドを得る。これを前記第１級アミンと、場合によりピリジン等の塩基の触媒量での存在下で反応させることにより、目的の化合物を得る。各反応段階における好ましい反応条件は、当業者に公知である。 In the above formula (I), a compound in which the bridging group A is an amide bond (—C (═O) NH—) can be prepared, for example, according to the following scheme 3.

(In the formula, n, x and R are as defined above, and X is halogen)
First, a primary amine is obtained by halogenating an alcohol HO (CH ₂ CH ₂ O) _x R serving as a base of a substituent on a monomer with an appropriate halogenating reagent, then treating with potassium phthalimido, and further hydrolyzing. Get. Moreover, the carboxylic acid chloride is obtained by processing the carboxylic acid of the unsaturated cyclic compound obtained according to the above-mentioned scheme 2 with, for example, thionyl chloride. This is reacted with the primary amine, optionally in the presence of a catalytic amount of a base such as pyridine, to give the desired compound. Preferred reaction conditions for each reaction step are known to those skilled in the art.

（式中、ｎ、ｘ、Ｒは、上記定義のとおりであり、Ｘは、ハロゲンであり、ｌは、０〜４の整数である）
まず、アルコールＨＯ（ＣＨ_２ＣＨ_２Ｏ）_ｘＲを例えばＮａＨで処理することにより得られるナトリウムアルコキシドを、α，ω−ジハロアルカンと反応させることにより、Ｘ−低級アルキレン−Ｏ−（ＣＨ_２ＣＨ_２Ｏ）_ｘＲを合成する。次いで得られた化合物とマグネシウムを反応させることで、対応するグリニャール試薬とする。これをさらに、上記スキーム１に従って得られるハロゲン化不飽和環状化合物と、例えば乾燥ＴＨＦのような溶媒中、ヨウ化銅（Ｉ）の存在下で反応させることにより、目的の生成物を得る。 In the above formula (I), a compound in which the bridging group A is lower alkylene (—C _n H _2n —) can be prepared, for example, according to the following scheme 4.

(In the formula, n, x and R are as defined above, X is a halogen, and l is an integer of 0 to 4).
First, a sodium alkoxide obtained by treating an alcohol HO (CH ₂ CH ₂ O) _x R with, for example, NaH is reacted with an α, ω-dihaloalkane to produce an X-lower alkylene-O— (CH ₂ CH ₂ O) _x R is synthesized. Then, the resulting compound and magnesium are reacted to obtain the corresponding Grignard reagent. This is further reacted with the halogenated unsaturated cyclic compound obtained according to Scheme 1 in the presence of copper (I) iodide in a solvent such as dry THF to obtain the desired product.

上記式（II）で示されるポリマー組成物においては、モノマー単位間の二重結合は、その各々についてcis又はtrans配置をとることができる。 A polymer composition having a repeating unit represented by the formula (II) can be obtained by ring-opening polymerization of the cyclic compound represented by the formula (I).

In the polymer composition represented by the above formula (II), the double bond between the monomer units can take a cis or trans configuration for each.

With respect to the polymer composition represented by the formula (II), the chemical stability of the polymer composition can be improved by reducing the unsaturated bond to a saturated bond by hydrogenation. Can be increased. Moreover, a function can be added to the polymer composition by introducing an appropriate group instead of hydrogen. The structure of the polymer composition obtained by hydrogenating the polymer composition represented by the formula (II) is shown in the formula (III).

  In the polymer composition represented by the above formula (II) or formula (III), m represents the average degree of polymerization of the polymer. The value of m is not particularly limited, but can be adjusted by the ratio of the catalyst and monomer used in the polymerization reaction, and preferably ranges from 2 to 20000. The average molecular weight of the polymer composition varies depending on the molecular weight of the monomer used, and is not particularly limited, but is preferably in the range of 2000 to 1000000, more preferably in the range of 5000 to 800000, and in the range of 10,000 to 500000. Most preferably it is. The molecular weight distribution of the polymer composition is not particularly limited, but is preferably in the range of 1.0 to 10, more preferably in the range of 1.0 to 8, and in the range of 1.05 to 5.0. Most preferably it is.

  As is clear from the above formulas (II) and (III), a substituent may be provided on a carbon atom other than the carbon atom constituting the unsaturated bond that is opened in the cyclic compound used as a monomer in the polymerization. As a result, the polymer composition produced according to the present invention has a very high degree of freedom in providing a side chain, and it is possible to synthesize a biocompatible polymer composition having a wide range of characteristics. The polymer composition produced according to the present invention is also characterized by the fact that the two carbon atoms sandwiching the bond formed during the polymerization are not provided with side chains.

  In a polymer composition in which a side chain including an ether structure is provided with respect to a main chain mainly composed of an alkyl chain such as PMEA which is conventionally known, the main chain is formed due to the structure of the monomer used for polymerization. It has been usual that side chains are provided for one half of the carbon atoms. On the other hand, the PMEA and the like thus obtained have a lower chemical stability than polyethylene which is an alkyl chain having no side chain, and this is due to the presence of a large amount of introduced side chains. It is considered to be a thing.

  On the other hand, in the polymer composition produced by the method according to the present invention, it is easy to introduce side chains at a ratio of less than 1/2 with respect to the carbon atoms constituting the main chain. For example, by using a cyclic compound in which one substituent is introduced into a 4-membered ring structure as a monomer, side chains can be introduced at a ratio of 1/4 with respect to carbon atoms forming the main chain, etc. A more stable biocompatible polymer can be easily obtained. On the other hand, depending on the application for which the polymer composition is used, it is also possible to introduce side chains at a ratio of 1/2 or more (not including 1/2) to the carbon atoms constituting the main chain, By introducing two side chains for each carbon atom, a very specific polymer composition can also be produced.

  In the polymer composition represented by the above formula (II) or formula (III), a position-specific polymer can be used for a substituent containing an ether structure depending on its use. Here, “position-specific” means that substituents are arranged at equal intervals with respect to the main chain of the polymer. According to the production method of the present invention, a position-specific polymer composition can be produced when the density of substituents is 1/3 or less compared to the number of ring members. For example, the number of ring members is n + 3 and When a cycloalkene having a number of 1 is used as a monomer, by adjusting polymerization conditions and a catalyst to be used, an asymmetric chain molecule generated by ring opening is polymerized in a so-called head-to-tail type, In the resulting polymer, substituents can be provided every n + 3 carbon atoms in the polymer backbone. The polymer obtained by the production method according to the present invention has a positional specificity of about 90% or more, particularly about 95% or more, with respect to the degree of polymerization.

  In the method for producing a polymer according to the present invention, as a specific means for ring-opening polymerization of a cyclic compound represented by the formula (I), a compound represented by the formula (ROMP) is used in the presence of a catalyst by a ring-opening metathesis polymerization reaction (ROMP). A polymer composition as shown in II) can be obtained.

The ring-opening metathesis polymerization reaction is a chain polymerization reaction that uses a cycloalkene as a monomer and proceeds by a continuous ring-opening metathesis reaction between the monomer and a transition metal carbene complex that is a catalyst.

（式中、Ｃｙは、シクロヘキシル基であり、Mesは、２，４，６−トリメチルフェニル基である）のようなカルベン錯体が挙げられるが、これらに限定されない。
本発明のような置換基を有する環状化合物を重合して、側鎖を含むポリマーを調製する場合においては、触媒活性、官能基耐性、安定性、オレフィン選択性等の面から、ルテニウムのカルベン錯体、いわゆるGrubbs触媒を用いることが好ましい。Grubbs触媒の中でも、第二世代Grubbs触媒といわれる、Ｎ−ヘテロサイクリックカルベン（ＮＨＣ）配位子を有するルテニウム錯体が、高度に位置選択的なポリマーが得られるために、好ましい。以下、単に「第二世代Grubbs触媒」というときは、上記２のルテニウム錯体を指す。 As the catalyst used when the ring-opening metathesis polymerization reaction is used in the present invention, a transition metal carbene complex is preferably used in addition to a transition metal halide and an organometallic cocatalyst. A transition metal carbene complex is a transition metal complex having a double bond between a transition metal and carbon. For example, titanium (Ti), tantalum (Ta), molybdenum (Mo), tungsten (W), ruthenium (Ru), etc. The carbene complex acts as a catalyst for the ring-opening metathesis polymerization reaction. Examples of ruthenium carbene complexes include:

(Wherein Cy is a cyclohexyl group and Mes is a 2,4,6-trimethylphenyl group), but is not limited thereto.
In the case of preparing a polymer containing a side chain by polymerizing a cyclic compound having a substituent as in the present invention, a ruthenium carbene complex is used from the viewpoint of catalytic activity, functional group resistance, stability, olefin selectivity and the like. It is preferable to use a so-called Grubbs catalyst. Among Grubbs catalysts, a ruthenium complex having an N-heterocyclic carbene (NHC) ligand, which is referred to as a second generation Grubbs catalyst, is preferable because a highly regioselective polymer can be obtained. Hereinafter, the term “second generation Grubbs catalyst” refers to the ruthenium complex 2 described above.

  When performing ring-opening metathesis polymerization, it is preferable to use a solvent as necessary. The solvent used in the ring-opening metathesis polymerization reaction is not particularly limited as long as it is inert to the reaction and dissolves the reaction product. Examples of the solvent include aliphatic hydrocarbons such as pentane, hexane, heptane, octane, cyclohexane, cyclooctane, cyclodecane, cyclododecane, and petroleum ether, aliphatic halogenated hydrocarbons such as dichloroethane and chloroform, benzene, and toluene. Aromatic hydrocarbons such as xylene, ethylbenzene and isopropylbenzene, aromatic halogenated hydrocarbons such as chlorobenzene and chlorotoluene, ether solvents such as tetrahydrofuran (THF) and tetrahydropyran (THP) are used. Of these solvents, aromatic hydrocarbons, aromatic halogenated hydrocarbons, and ether solvents are preferred, and THF and THP are more preferred.

  The temperature at which the polymerization is performed by the ring-opening metathesis polymerization reaction in the present invention may be within a range in which the reaction proceeds and the raw materials and products are not decomposed, and is usually room temperature to 250 ° C., preferably 50 to 200 ° C., more preferably 60. ~ 180 ° C. The reaction pressure is not particularly limited as long as the reaction proceeds, and may be any of normal pressure, pressurization, and reduced pressure. The reaction atmosphere may be in the air, but is preferably in an inert gas atmosphere such as helium, nitrogen, or argon, or in an air stream. In addition, although reaction time changes with reaction conditions etc., it is the range of 0.1 to 100 hours normally.

  The amount of the catalyst used for the ring-opening metathesis polymerization reaction varies depending on the catalyst type, reaction conditions, etc., but the catalyst is 0.00001 to 0.3 mol, more preferably 0.0001 to 0.1 mol per 1 mol of the monomer of formula (I). The ratio is preferably 0.2 mol, particularly 0.001 to 0.1 mol. A single catalyst or a plurality of catalysts can be used.

  By performing ring-opening polymerization of a cyclic compound by a ring-opening metathesis polymerization reaction, a polymer composition in which an unsaturated bond remains in the main chain as represented by the above formula (II) can be obtained. For such a polymer composition, an unsaturated bond as represented by the above formula (III) is obtained by hydrogenation by means known to those skilled in the art as necessary for reasons such as increasing the stability. Can be obtained.

  Hydrogenation can be performed, for example, by reacting a polymer composition represented by the formula (II) with a hydrazide compound such as p-toluenesulfonic acid hydrazide in an appropriate solvent in an inert solvent. Further, it can be generated by reacting with hydrogen gas in the presence of palladium-supported activated carbon or the like as a catalyst.

  The solvent used in the hydrogenation is not particularly limited as long as it is inert to the reaction and is soluble in the polymer composition to be hydrogenated. Examples of solvents that can be used include, but are not limited to, THF, THP, toluene, xylene, and the like.

The hydrogenation rate at which the unsaturated bond in the polymer composition as represented by formula (II) is reduced by hydrogenation is preferably 90% or more, more preferably 95% or more, and most preferably 99% or more. It is desirable. The hydrogenation rate can be determined, for example, by observing a signal derived from unsaturated bond hydrogen using ¹ H NMR.

  In addition to hydrogenation, a polymer composition having an unsaturated bond as represented by formula (II) can be reacted with a reagent that is reactive with a double bond, in addition to hydrogen. It is also possible to introduce a functional group of Examples of the reaction for introducing a substituent to the unsaturated bond include addition of hydrogen halide, halogenation, hydroboration, syn-dihydroxylation, and the like, and depending on the intended use of the resulting polymer composition, etc. Can be determined.

  In the method for producing a polymer composition according to the present invention, two or more different cyclic compounds differing in the number of member rings, substituent structure, substituent density, etc. are used for the cyclic compound used as a monomer for polymerization. Thus, a polymer composition which is a copolymer can be produced. For example, a substituted cyclooctene (8-membered ring) and a substituted cyclobutene (4-membered ring) may be used simultaneously in the ring-opening metathesis polymerization reaction, a compound in which the side chain is bonded to the ring by an ester bond, and the side chain is an ether You may use for the ring-opening metathesis polymerization reaction simultaneously with the compound couple | bonded with the ring by the coupling | bonding. In particular, for the purpose of imparting a specific function to the polymer composition produced without departing from the spirit of the present invention, a cyclic compound having a group not containing an ether structure is mixed during the polymerization to obtain a polymer composition. It is also possible to introduce a side chain that does not contain an ether structure into a part of the product. In addition, two or more types of polymer compositions having different structures produced by the production method according to the present invention may be used in combination, or may be used by mixing with polymer compositions produced by other production methods. Is possible.

  Furthermore, in the method for producing a polymer composition according to the present invention, at the time of polymerization, for example, monomers such as ethylene, styrene, and methyl methacrylate are mixed to introduce units derived from these monomers into the polymer composition. It may be. Further, a block copolymer with a polymer such as polyethylene, polystyrene, or polymethyl methacrylate may be formed.

  The polymer composition produced according to the present invention may contain, for example, a radical scavenger, a peroxide decomposer, an antioxidant, an ultraviolet absorber, and a heat stabilizer within the range not departing from the gist of the present invention. Additives such as an agent, a plasticizer, a flame retardant, and an antistatic agent can be added and used.

  Various polymer compositions produced according to the present invention can be used alone by being dissolved in an appropriate organic solvent, or mixed with other polymer compounds depending on the purpose of use. It can be used as a composition. Moreover, the medical device of this invention should just have the polymer composition of this invention in at least one part of the surface used in contact with a biological tissue or blood. That is, a composition containing the polymer composition of the present invention can be used as a surface treatment agent on the surface of a base material constituting a medical device. Moreover, you may comprise at least one part member of a medical device with the polymer composition of this invention, or its composition.

  The polymer composition of the present invention can be preferably used for medical applications. When the polymer composition of the present invention is mixed with other polymer compounds and used as a composition, it can be used in an appropriate mixing ratio depending on the intended use. In particular, by setting the ratio of the polymer composition of the present invention to 90% by weight or more, a composition having the characteristics of the present invention can be obtained. In addition, depending on the intended use, by setting the proportion of the polymer composition of the present invention to 50 to 70% by weight, it is possible to obtain a composition having various characteristics while utilizing the features of the present invention.

The medical device of the present invention is a device used for medical applications having the polymer composition of the present invention on at least a part of its surface. The surface of the medical device as used in the present invention refers to, for example, the surface of the material constituting the medical device that comes into contact with blood when the medical device is used, the surface portion of the hole in the material, and the like.
In this specification, “used in contact with tissue or blood in a living body” is used, for example, in contact with the tissue or blood in a state where it is placed in the living body or in a state where the tissue in the living body is exposed. Naturally, the form and the form used in contact with blood which is an in vivo component taken out of the body in the extracorporeal circulation medical material are included. In addition, “used for medical use” includes the above-mentioned “used in contact with in vivo tissues and blood” or intended use.

  In the present invention, the material and shape of the members constituting the medical device are not particularly limited, and may be any of porous bodies, fibers, nonwoven fabrics, particles, films, sheets, tubes, hollow fibers, powders, and the like. The materials include natural polymers such as Kinishiki and hemp, nylon, polyester, polyacrylonitrile, polyolefin, halogenated polyolefin, polyurethane, polyamide, polycarbonate, polysulfone, polyethersulfone, poly (meth) acrylate, and ethylene-vinyl alcohol. Examples thereof include synthetic polymers such as polymers and butadiene-acrylonitrile copolymers, and mixtures thereof. Moreover, a metal, ceramics, those composite materials, etc. can be illustrated and you may comprise from several base material.

  The polymer composition of the present invention can be used for medical devices used in contact with tissues and blood in vivo, and can be used for implantable artificial organs and therapeutic instruments, extracorporeal circulation type artificial organs, and catheters (blood vessels). Medical devices such as contrast catheters, guide wires, circulatory catheters such as PTCA catheters, gastrointestinal catheters, gastrointestinal catheters, gastrointestinal catheters such as esophageal tubes, tubes, urinary catheters, urinary catheters such as urinary catheters) It is desirable to be used on at least a part of the surface in contact with blood, preferably almost all of the surface in contact with blood.

  The polymer composition of the present invention includes a hemostatic agent, an adhesive for living tissue, a repair material for tissue regeneration, a carrier for a sustained drug release system, a hybrid artificial organ such as an artificial pancreas and an artificial liver, an artificial blood vessel, an embolic material, and cell engineering. It may be used as a matrix material for a scaffold for use.

  In these medical devices, since the insertion into a blood vessel or tissue is facilitated and the tissue is not damaged, surface lubricity may be further imparted. As a method for imparting surface lubricity, a method in which a water-soluble polymer is insolubilized to form a water-absorbing gel layer on the material surface is excellent. According to this method, a material surface having both biocompatibility and surface lubricity can be provided.

The polymer composition of the present invention itself is a material excellent in biocompatibility, but since it can further carry various physiologically active substances, not only a blood filter but also a blood storage container, a blood circuit, an indwelling needle It can be used for various medical devices such as catheters, guide wires, stents, artificial lung devices, dialysis devices, and endoscopes.
Specifically, the polymer composition of the present invention may be coated on at least a part of the substrate surface constituting the blood filter. Further, the polymer compound of the present invention may be coated on at least a part of the blood bag and the surface of the tube communicating with the blood bag in contact with the blood. In addition, blood in an extracorporeal circulation blood circuit composed of an instrument side blood circuit unit composed of a tube, an arterial filter, a centrifugal pump, a hemoconcentrator, a cardio pregear, etc., and an operative field side blood circuit unit composed of a tube, catheter, soccer, etc. At least a part of the surface in contact with the polymer may be coated with the polymer composition of the present invention.
Further, an inner needle having a sharp needle tip at a distal end, an inner needle hub installed on the proximal end side of the inner needle, a hollow outer needle into which the inner needle can be inserted, and a proximal end side of the outer needle An indwelling needle assembly comprising: an outer needle hub installed on the inner needle; a protector mounted on the inner needle and movable in the axial direction of the inner needle; and a connecting means for connecting the outer needle hub and the protector. At least a portion of the three-dimensional, blood-contacting surface may be coated with the polymer composition of the present invention. Further, at least a part of the surface of the long tube that contacts the blood of the catheter composed of an adapter connected to the proximal end (hand side) thereof may be coated with the polymer composition of the present invention.
Further, at least a part of the surface of the guide wire that comes into contact with blood may be coated with the polymer composition of the present invention. In addition, stents of various shapes, such as hollow tubular bodies made of metal materials or polymer materials with pores on the side, metal material wires or polymer material fibers knitted into a cylindrical shape, etc. At least a portion of the surface in contact with blood may be coated with the polymer composition of the present invention.
Also, a large number of porous hollow fiber membranes for gas exchange are housed in a housing, blood flows on the outer surface side of the hollow fiber membrane, and oxygen-containing gas flows inside the hollow fiber membrane. The lung may be an artificial lung in which the outer surface or outer layer of the hollow fiber membrane is coated with the polymer composition of the present invention.
Further, a dialysate circuit including at least one dialysate container filled with dialysate and at least one drainage container for collecting dialysate, and starting from the dialysate container, or As an end point, a dialysis apparatus having a liquid feeding means for feeding a dialysate, and at least a part of the surface in contact with the blood may be coated with the polymer composition of the present invention.

  As a method for holding the composition containing the polymer composition of the present invention on the surface of a medical device or the like, a coating method, graft polymerization by radiation, electron beam or ultraviolet ray, a chemical reaction with a functional group of a substrate is used. Well-known methods, such as a method to introduce | transduce, are mentioned. Among these, the coating method is particularly preferable in practical use because the manufacturing operation is easy. Furthermore, there are coating methods, spraying methods, dipping methods and the like as coating methods, and any of them can be applied without any particular limitation. The film thickness is preferably 0.1 μm to 1 mm. For example, in the coating treatment by the coating method of the composition containing the polymer compound of the present invention, the member to be coated is immersed in a coating solution in which the composition containing the polymer composition of the present invention is dissolved in an appropriate solvent. It can be carried out by a simple operation such as removing excess solution and then air drying. In addition, in order to more firmly fix the polymer composition of the present invention to the member to be coated, heat can be applied after coating to further improve the adhesion to the polymer composition of the present invention. Moreover, you may fix | immobilize by bridge | crosslinking the surface. As a method for crosslinking, a crosslinkable monomer may be introduced as a comonomer component. Moreover, you may bridge | crosslink by an electron beam, a gamma ray, and light irradiation.

  In addition to compounds having a plurality of vinyl groups or allyl groups in one molecule such as methylene bisacrylamide, trimethylolpropane diacrylate, triallyl isocyanate, trimethylolpropane triacrylate, tetramethylolmethane tetraacrylate, etc. And polyethylene glycol diacrylate. Among these, when various functional groups are introduced using polyethylene glycol diacrylate, the introduction rate of the compound having a functional group is high, and further, by introducing a polyethylene glycol chain to make it hydrophilic, as described above This is preferable because nonspecific adsorption of cells and proteins other than the intended purpose is suppressed. In this case, the molecular weight of the polyethylene glycol chain is preferably 100 to 10,000, and more preferably 500 to 6,000.

  As described above, when the composition containing the polymer composition of the present invention is introduced into at least a part of the surface of the medical device that comes into contact with blood, activation of the coagulation system, complement system, platelet system, etc. can be suppressed. Therefore, excellent biocompatibility can be imparted.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited by these Examples. In addition, as long as there was no notice in particular, the chemical | medical agent used in the following examples used the commercial item as it was. In the following examples, confirmation of the structure of the product (intermediate compound, final compound) obtained in Examples 1 to 4, the degree of polymerization, the number average molecular weight and molecular weight distribution of the polymer obtained in each Example Measurement, measurement of the glass transition temperature of the polymer, contact angle, and confirmation of the presence or absence of intermediate water were performed as follows.

(1) Number average molecular weight ([Mn], unit: g / mol)
Gel permeation chromatography (GPC) calibrated with standard polystyrene having a known peak molecular weight ("HLC-8220" manufactured by Tosoh Corporation, column configuration: Tosoh TSK-gels super AW5000, super AW4000, super AW3000) Used to measure the number average molecular weight (Mn) and weight average molecular weight (Mw) of the polymer. (Solvent: tetrahydrofuran, temperature: 40 ° C., flow rate: 1.0 mL / min).

(2) Molecular weight distribution ([Mw / Mn])
It calculated | required as the ratio (Mw / Mn) using the value of the weight average molecular weight (Mw) and the number average molecular weight (Mn) calculated | required by the method of said (1).

(3) Glass transition temperature ([Tg], unit: ° C)
Measurement was performed using a DSC apparatus (SII Nano Technologies, Inc., “EXSTAR X-DSC7000”) under conditions of a nitrogen flow rate of 50 mL / min and 5.0 ° C./min. The temperature program was (i) cooling from 30 ° C. to −100 ° C., (ii) holding at −100 ° C. for 5 minutes, and (iii) heating from −100 ° C. to 30 ° C. The glass transition temperature observed in (iii) above is shown.

(4) A polymer solution having a contact angle of 0.2 g / mL was prepared, and a spin coat substrate was prepared. After air-drying for 24 hours, 2 μL of ultrapure water was dropped on the coating substrate, the contact angle θ / 2 after 30 seconds was measured, and θ was calculated. Three contact angles were measured for each of the five spin-coated substrates, and the average value was used.

(5) Confirmation of presence / absence of intermediate water Using a DSC apparatus (SII Nanotechnology Inc., “EXSTAR X-DSC7000”), measurement was performed under conditions of a nitrogen flow rate of 50 mL / min and 5.0 ° C./min. The temperature program was (i) cooling from 30 ° C. to −100 ° C., (ii) holding at −100 ° C. for 5 minutes, and (iii) heating from −100 ° C. to 30 ° C. In (iii) above, the presence or absence of intermediate water was confirmed by the presence or absence of an exothermic peak due to low temperature crystallization of water and an endothermic peak due to low temperature melting of water.

(6) NMR measurement About structural analysis of the monomer and the polymer, ¹ H-NMR measurement and ¹³ C-NMR measurement were performed using an NMR measurement apparatus (manufactured by JEOL Ltd., JEOL 500 MHz JNM-ECX). The chemical shift was based on CDCl ₃ ( ¹ H: 7.26 ppm, ¹³ C: 77.1 ppm).

（１）３−ブロモ−１−シクロオクテンの合成
（ｉ）３口ナスフラスコ（容量１０００mL）に、cis−シクロオクテン１２３．５ｇ（１．１２mol）、Ｎ−ブロモスクシンイミド１２０ｇ（６７５mmol）、四塩化炭素４００mLを加え、系内を攪拌しつつ窒素バブリングを３０分行った。アゾビスイソブチロニトリル７９．３mg（０．４８mmol）を加え、９０℃、２時間加熱還流を行って３−ブロモ−１−シクロオクテンを調製した。反応溶液を室温まで冷却した後、沈殿したスクシンイミドを吸引ろ過により濾別した。ろ液から四塩化炭素、過剰に用いたcis−シクロオクテンを減圧留去し、ヘキサンと混合した後、水で洗浄操作を行った。得られた有機層を減圧留去し、黄色透明の液体を得た。
（ｉｉ）上記（ｉ）で得られた液体を減圧蒸留で分離精製し、３−ブロモ−１−シクロオクテン７６．１ｇ（４０３mmol、収率６２mol％）（透明液体）を得た。その沸点は４０℃／０．０８mmHgであり、ＮＭＲスペクトルにおけるピークは以下のとおりであった。
・^１Ｈ−ＮＭＲ（５００ＭＨｚ、ＣＤＣｌ₃）：δ＝５．８３−５．７５（ｍ，１Ｈ）、５．６５−５．５５（ｍ，１Ｈ）、 ４．９９−４．９２（ｍ，１Ｈ）、２．２９−２．１６（ｍ，２Ｈ）、２．１１（ｍ，１Ｈ）、２．０５−１．９４（ｍ，１Ｈ）、１．７５−１．６４（ｍ，２Ｈ）、１．６２−１．４７（ｍ，２Ｈ）、１．４５−１．２３（ｍ，２Ｈ）．
・^１３Ｃ−ＮＭＲ（１２５ＭＨｚ、ＣＤＣｌ₃）：δ＝１３３．３０，１２９．９１，４９．０７，４０．９４，２９．０８，２６．６２，２６．２１，２５．７５． 1. Preparation of Monomer << Example 1 >> [Synthesis of 3-methoxy-1-cyclooctene]

(1) Synthesis of 3-bromo-1-cyclooctene (i) In a 3-neck eggplant flask (capacity 1000 mL), cis-cyclooctene 123.5 g (1.12 mol), N-bromosuccinimide 120 g (675 mmol), tetrachloride 400 mL of carbon was added, and nitrogen bubbling was performed for 30 minutes while stirring the system. 3-Bromo-1-cyclooctene was prepared by adding 79.3 mg (0.48 mmol) of azobisisobutyronitrile and heating to reflux at 90 ° C. for 2 hours. After cooling the reaction solution to room temperature, the precipitated succinimide was separated by suction filtration. Carbon tetrachloride and cis-cyclooctene used in excess were distilled off from the filtrate under reduced pressure, mixed with hexane, and washed with water. The obtained organic layer was distilled off under reduced pressure to obtain a yellow transparent liquid.
(Ii) The liquid obtained in (i) above was separated and purified by distillation under reduced pressure to obtain 76.1 g (403 mmol, yield 62 mol%) of 3-bromo-1-cyclooctene (transparent liquid). Its boiling point was 40 ° C./0.08 mmHg, and the peaks in the NMR spectrum were as follows.
¹ H-NMR (500 MHz, CDCl ₃ ): δ = 5.83-5.75 (m, 1H), 5.65-5.55 (m, 1H), 4.99-4.92 (m, 1H), 2.29-2.16 (m, 2H), 2.11 (m, 1H), 2.05-1.94 (m, 1H), 1.75-1.64 (m, 2H) 1.62-1.47 (m, 2H), 1.45-1.23 (m, 2H).
^{· 13 C-NMR (125MHz,} CDCl 3): δ = 133.30,129.91,49.07,40.94,29.08,26.62,26.21,25.75.

(2) Synthesis of 3-methoxy-1-cyclooctene (i) To a three-necked eggplant flask (capacity: 500 mL) was added 42.6 g (225 mmol) of 3-bromo-1-cyclooctene and 200 mL of methanol. 3-Methoxy-1-cyclooctene was prepared by heating and stirring for a period of time. Methanol was distilled off under reduced pressure, 100 mL of water was added, and extraction was performed 3 times using 100 mL of hexane. The obtained oil layer was washed with an aqueous sodium hydrogen carbonate solution and then dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure to obtain a liquid.
(Ii) The liquid obtained in (i) above was purified by distillation under reduced pressure in the presence of calcium hydride to obtain 18.2 g (yield 58 mol%) of 3-methoxy-1-cyclooctene (transparent liquid) ) Its boiling point was 51 ° C./70 mmHg. The NMR spectrum is shown in FIG. The peaks in the NMR spectrum were as follows.
¹ H-NMR (500 MHz, CDCl ₃ ): δ = 5.71 (dddd, J = 10.9, 9.0, 7.3, 1.6 Hz, 1H) 5.47 (ddd, J = 10. 9, 7.1, 1.3 Hz, 1H), 4.14 (dddd, J = 11.5, 6.6, 4.5, 1.5 Hz, 1H), 3.32 (s, 3H), 2 .22-2.05 (m, 2H), 1.92 (ddt, J = 13.2, 9.0, 4.3 Hz, 1H), 1.69-1.33 (m, 7H).
^{· 13 C-NMR (125MHz,} CDCl 3): δ = 133.79,130.34,78.26,56.44,35.70,29.20,26.53,26.32,23.72.

（１）３−（２−メトキシエトキシ）−１−シクロオクテンの合成
（ｉ）３−ブロモ―１−シクロオクテンは≪実施例１≫の（１）と同様にして調製した。
（ｉｉ）３口ナスフラスコ（容量５００mL）に、３−ブロモ−１−シクロオクテン４８．４ｇ（２５６mmol）、２−メトキシエタノール２００mLを加え、５０℃、２４時間加熱攪拌を行って３−（２−メトキシエトキシ）−１−シクロオクテンを調製した。２−メトキシエタノールを減圧留去した後、水３００mLを加え、ジエチルエーテル１００mLを用いて３回抽出操作を行った。得られた油層を炭酸水素ナトリウム水溶液で洗浄した後、無水硫酸マグネシウム上で乾燥した。溶媒を減圧留去し、液体を得た。
（ｉｉｉ）上記（ｉｉ）で得られた液体を、水素化カルシウムの存在下に減圧蒸留を行うことで精製し、３−（２−メトキシエトキシ）−１−シクロオクテン１２．２ｇ（６６．３mmol、収率２５mol％）（透明液体）を得た。その沸点は４７℃／０．０８mmHgであった。ＮＭＲスペクトルを図２に示す。ＮＭＲスペクトルにおけるピークは以下のとおりであった。
・^１Ｈ−ＮＭＲ（５００ＭＨｚ、ＣＤＣｌ₃）：δ＝５．６８（ｄｄｄｄ，Ｊ＝１０．８，９．０，７．３，１．６Ｈｚ，１Ｈ），５．４９（ｄｄｄ，Ｊ＝１０．９，７．２，１．４Ｈｚ，１Ｈ），４．３２−４．１８（ｍ，１Ｈ），３．５５−３．４７（ｍ，３Ｈ），３．３７（ｓ，３Ｈ），２．２０−２．１０（ｍ，１Ｈ），２．１０−２．０１（ｍ，１Ｈ），１．９９−１．８８（ｍ，１Ｈ），１．７０−１．２７（ｍ，７Ｈ）．
・^１３Ｃ−ＮＭＲ（１２５ＭＨｚ、ＣＤＣｌ₃）：δ＝１３３．９３，１３０．１８，７７．１６，７２．２５，６８．００，５９．１０，３５．８０，２９．２４，２６．５４，２６．３１，２３．７６． Example 2 [Synthesis of 3- (2-methoxyethoxy) -1-cyclooctene]

(1) Synthesis of 3- (2-methoxyethoxy) -1-cyclooctene (i) 3-Bromo-1-cyclooctene was prepared in the same manner as (1) of << Example 1 >>.
(Ii) 3-Bromo-1-cyclooctene (48.4 g, 256 mmol) and 2-methoxyethanol (200 mL) were added to a 3-neck eggplant flask (capacity: 500 mL), and the mixture was heated and stirred at 50 ° C. for 24 hours to give 3- (2 -Methoxyethoxy) -1-cyclooctene was prepared. After 2-methoxyethanol was distilled off under reduced pressure, 300 mL of water was added, and extraction operation was performed 3 times using 100 mL of diethyl ether. The obtained oil layer was washed with an aqueous sodium hydrogen carbonate solution and then dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure to obtain a liquid.
(Iii) The liquid obtained in (ii) above was purified by distillation under reduced pressure in the presence of calcium hydride to give 12.2 g (66.3 mmol) of 3- (2-methoxyethoxy) -1-cyclooctene. Yield 25 mol%) (transparent liquid). Its boiling point was 47 ° C./0.08 mmHg. The NMR spectrum is shown in FIG. The peaks in the NMR spectrum were as follows.
¹ H-NMR (500 MHz, CDCl ₃ ): δ = 5.68 (dddd, J = 10.8, 9.0, 7.3, 1.6 Hz, 1H), 5.49 (ddd, J = 10 .9, 7.2, 1.4 Hz, 1H), 4.32-4.18 (m, 1H), 3.55-3.47 (m, 3H), 3.37 (s, 3H), 2 20-2.10 (m, 1H), 2.10-2.01 (m, 1H), 1.99-1.88 (m, 1H), 1.70-1.27 (m, 7H) .
¹³ C-NMR (125 MHz, CDCl ₃ ): δ = 133.93, 130.18, 77.16, 72.25, 68.00, 59.10, 35.80, 29.24, 26.54, 26.31, 23.76.

（１）３−［２−（２−メトキシエトキシ）エトキシ］−１−シクロオクテンの合成
（ｉ）３−ブロモ―１−シクロオクテンは≪実施例１≫の（１）と同様にして調製した。
（ｉｉ）３口ナスフラスコ（容量５００mL）に、３−ブロモ−１−シクロオクテン４５．２ｇ（２３８mmol）、２−（２−メトキシエトキシ）エタノール２００mLを加え、８０℃、２４時間加熱攪拌を行って３−［２−（２−メトキシエトキシ）エトキシ］−１−シクロオクテンを調製した。２−（２−メトキシエトキシ）エタノールを減圧留去した後、水３００mLを加え、ジエチルエーテル１００mLを用いて３回抽出操作を行った。得られた油層を炭酸水素ナトリウム水溶液で洗浄した後、無水硫酸マグネシウム上で乾燥した。溶媒を減圧留去し、液体を得た。
（ｉｉｉ）上記（ｉｉ）で得られた液体を、水素化カルシウムの存在下に減圧蒸留を行うことで精製し、３−［２−（２−メトキシエトキシ）エトキシ］−１−シクロオクテン１７．２ｇ（７５．４mmol、収率３２mol％）（透明液体）を得た。その沸点は１００℃／０．０８mmHgであった。ＮＭＲスペクトルを図３に示す。ＮＭＲスペクトルにおけるピークは以下のとおりであった。
・^１Ｈ−ＮＭＲ（５００ＭＨｚ、ＣＤＣｌ₃）：δ＝５．６９（ｄｄｄｄ，Ｊ＝１０．９，９．０，７．２，１．６Ｈｚ，１Ｈ），５．４９（ｄｄｄ，Ｊ＝１０．９，７．２，１．３Ｈｚ，１Ｈ），４．２９（ｄｄｄｄ，Ｊ＝１１．０，６．３，４．５，１．５Ｈｚ，１Ｈ），３．７１−３．６２（ｍ，５Ｈ），３．５９−３．５２（ｍ，３Ｈ），３．３８（ｓ，３Ｈ），２．２１−２．１１（ｍ，１Ｈ），２．１１−２．０３（ｍ，１Ｈ），１．９７−１．９０（ｍ，１Ｈ），１．７０−１．３１（ｍ，７Ｈ）．
・^１３Ｃ−ＮＭＲ（１２５ＭＨｚ、ＣＤＣｌ₃）：δ＝１３３．９８，１３０．１１，７７．１４，７２．０４，７０．９２，７０．５８，６８．０７，５９．０９，３５．８４，２９．２５，２６．５５，２６．３３，２３．７８． Example 3 [Synthesis of 3- [2- (2-methoxyethoxy) ethoxy] -1-cyclooctene]

(1) Synthesis of 3- [2- (2-methoxyethoxy) ethoxy] -1-cyclooctene (i) 3-Bromo-1-cyclooctene was prepared in the same manner as (1) of << Example 1 >>. .
(Ii) To a three-necked eggplant flask (capacity: 500 mL), 45.2 g (238 mmol) of 3-bromo-1-cyclooctene and 200 mL of 2- (2-methoxyethoxy) ethanol were added, and the mixture was heated and stirred at 80 ° C. for 24 hours. 3- [2- (2-methoxyethoxy) ethoxy] -1-cyclooctene was prepared. After 2- (2-methoxyethoxy) ethanol was distilled off under reduced pressure, 300 mL of water was added, and extraction operation was performed three times using 100 mL of diethyl ether. The obtained oil layer was washed with an aqueous sodium hydrogen carbonate solution and then dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure to obtain a liquid.
(Iii) The liquid obtained in (ii) above is purified by distillation under reduced pressure in the presence of calcium hydride, and 3- [2- (2-methoxyethoxy) ethoxy] -1-cyclooctene 17. 2 g (75.4 mmol, yield 32 mol%) (transparent liquid) was obtained. Its boiling point was 100 ° C./0.08 mmHg. The NMR spectrum is shown in FIG. The peaks in the NMR spectrum were as follows.
¹ H-NMR (500 MHz, CDCl ₃ ): δ = 5.69 (dddd, J = 10.9, 9.0, 7.2, 1.6 Hz, 1H), 5.49 (ddd, J = 10 .9, 7.2, 1.3 Hz, 1H), 4.29 (dddd, J = 11.0, 6.3, 4.5, 1.5 Hz, 1H), 3.71-3.62 (m) , 5H), 3.59-3.52 (m, 3H), 3.38 (s, 3H), 2.21-2.11 (m, 1H), 2.11-2.03 (m, 1H) ), 1.97-1.90 (m, 1H), 1.70-1.31 (m, 7H).
¹³ C-NMR (125 MHz, CDCl ₃ ): δ = 133.98, 130.11, 77.14, 72.04, 70.92, 70.58, 68.07, 59.09, 35.84, 29.25, 26.55, 26.33, 23.78.

（１）２−シクロオクテン−１−カルボン酸の合成
（ｉ）Ｄｅａｎ−Ｓｔａｒｋ装置を取り付けた３口ナスフラスコ（容量１０００mL）に、cis−シクロオクテン７４．５ｇ（６７７mmol）、ニンヒドリン２３．５ｇ（１３２mmol）、トルエン６００mLを加え、系内を攪拌しながら１４０℃で加熱還流を行い、生成した水を除去しつつ４０時間反応を行うことで３−（２−ヒドロキシ−１，３−インダンジオン−２−イル）−１−シクロオクテンを調製した。トルエン、過剰に用いたcis−シクロオクテンを減圧留去した後、若干黄色に着色した固体を得た。
（ｉｉ）３口ナスフラスコ（容量５００mL）に上記（ｉ）で得られた固体を入れ、ジエチルエーテル３００mLに分散させた後、攪拌しながら系を０℃に冷却した。発熱に注意しつつ過ヨウ素酸４７．８ｇ（２０９mmol）を徐々に加え、さらに室温で５時間反応させた。ジエチルエーテルを減圧留去した後、黄色の液体と固体からなる反応混合物を得た。
（ｉｉｉ）上記（ｉｉ）で得られた反応混合物にヘキサン１５０mLを加えて攪拌し、ヘキサンに可溶な成分のみ回収する操作を３回行った。得られた油層からヘキサンを減圧留去することで、２−シクロオクテン−１−カルボン酸を含む黄色の反応混合物１３．８ｇ（液体）を得た。 Example 4 [Synthesis of 3- (2-methoxyethoxycarbonyl) -1-cyclooctene]

(1) Synthesis of 2-cyclooctene-1-carboxylic acid (i) A 3 neck eggplant flask (capacity 1000 mL) equipped with a Dean-Stark apparatus was charged with 74.5 g (677 mmol) of cis-cyclooctene and 23.5 g of ninhydrin ( 132 mmol), toluene (600 mL) was added, the system was stirred and refluxed at 140 ° C., and the reaction was carried out for 40 hours while removing the produced water to give 3- (2-hydroxy-1,3-indandione- 2-yl) -1-cyclooctene was prepared. Toluene and cis-cyclooctene used in excess were distilled off under reduced pressure, and then a slightly yellow colored solid was obtained.
(Ii) The solid obtained in (i) above was placed in a three-necked eggplant flask (capacity: 500 mL), dispersed in 300 mL of diethyl ether, and then the system was cooled to 0 ° C. with stirring. Periodic acid 47.8 g (209 mmol) was gradually added while paying attention to the exotherm, and the mixture was further reacted at room temperature for 5 hours. After diethyl ether was distilled off under reduced pressure, a reaction mixture consisting of a yellow liquid and a solid was obtained.
(Iii) 150 mL of hexane was added to the reaction mixture obtained in (ii) above and stirred, and only the components soluble in hexane were recovered three times. By distilling off hexane under reduced pressure from the obtained oil layer, 13.8 g (liquid) of a yellow reaction mixture containing 2-cyclooctene-1-carboxylic acid was obtained.

(2) Synthesis of 3- (2-methoxyethoxycarbonyl) -1-cyclooctene (i) The reaction mixture obtained in (iii) of (1) above and 2-methoxyethanol in a 3-neck eggplant flask (capacity 500 mL) 150 mL was added, and 2.3 mL of sulfuric acid was added and reacted at 70 ° C. for 2 hours. After adding sodium hydrogencarbonate and neutralizing sulfuric acid, the precipitate was filtered off and 2-methoxyethanol was distilled off under reduced pressure to obtain 14.8 g of a yellow reaction mixture (liquid).
(Ii) The liquid obtained in (i) above was purified by distillation under reduced pressure in the presence of calcium hydride to give 12.9 g (60.8 mmol, yield of 3- (2-methoxyethoxycarbonyl) -1-cyclooctene. 46.1%) (transparent liquid). Its boiling point was 68.5 ° C./0.08 mmHg. The NMR spectrum is shown in FIG. The peaks in the NMR spectrum were as follows.
^{· 1 H-NMR (500MHz,} CDCl 3): δ = 5.75 (dddd, J = 10.7,8.2,7.1,1.0Hz, 1H), 5.68 (ddd, J = 10 .5, 8.5, 1.2, Hz, 1H), 4.35-4.09 (m, 2H), 3.64-3.55 (m, 2H), 3.54-3.43 ( m, 1H), 3.37 (s, 3H), 2.26 to 2.02 (m, 2H), 2.00 to 1.85 (m, 1H), 1.77 to 1.61 (m, 2H), 1.60-1.48 (m, 3H), 1.47-1.20 (m, 2H).
¹³ C-NMR (125 MHz, CDCl ₃ ): δ = 175.65, 131.21, 127.58, 70.56, 63.57, 59.03, 42.67, 33.52, 29.19, 26.51, 26.50, 25.28.

３口ナスフラスコ（容量１００mL）に、実施例１で得られた３−メトキシ−１−シクロオクテン１４．０ｇ（１００mmol）、乾燥ＴＨＦ４８mL、cis−４−オクテン５９．７mg（０．５３３mmol）を加え、凍結−脱気を繰り返した後、乾燥窒素ガスで反応容器を置換した。第二世代Grubbs触媒３４．０mg（４０．０μmol）を含む乾燥ＴＨＦ溶液（２．０mL）をシリンジで反応容器内に添加し、６０℃、１６時間、攪拌下に重合させ、次いでエチルビニルエーテル３mLを添加して重合反応を停止した。重合の進行度を^１Ｈ−ＮＭＲ測定により確認した結果、９９％以上であった。得られた重合体溶液の一部を用いて前述した方法で分子量を測定したところ、数平均分子量（Ｍｎ）５００００ｇ／mol及び、分子量分布（Ｍｗ／Ｍｎ）１．６であった。これらの結果を下記の表１に示す。得られた重合体の^１Ｈ−ＮＭＲスペクトルを図５（ａ）に、^１３Ｃ−ＮＭＲスペクトルを図５（ｂ）に示す。また、この重合体のガラス転移温度を上記した方法で測定したところ、表１に示すように−５２℃であった。 2. Preparation of polymer << Example 5 >>
(1) Production of 3-methoxy-1-cyclooctene polymer

To a three-necked eggplant flask (volume: 100 mL), 14.0 g (100 mmol) of 3-methoxy-1-cyclooctene obtained in Example 1, 48 mL of dry THF, and 59.7 mg (0.533 mmol) of cis-4-octene were added. After repeating freeze-deaeration, the reaction vessel was replaced with dry nitrogen gas. A dry THF solution (2.0 mL) containing 24.0 mg (40.0 μmol) of the second generation Grubbs catalyst was added to the reaction vessel with a syringe, polymerized with stirring at 60 ° C. for 16 hours, and then 3 mL of ethyl vinyl ether was added. The polymerization reaction was stopped by adding. As a result of confirming the degree of progress of the polymerization by ¹ H-NMR measurement, it was 99% or more. When molecular weight was measured by the method mentioned above using a part of obtained polymer solution, it was number average molecular weight (Mn) 50000g / mol and molecular weight distribution (Mw / Mn) 1.6. These results are shown in Table 1 below. FIG. 5 (a) shows the ¹ H-NMR spectrum of the obtained polymer, and FIG. 5 (b) shows the ¹³ C-NMR spectrum. Moreover, when the glass transition temperature of this polymer was measured by the above-mentioned method, it was -52 degreeC as shown in Table 1.

（ｉ）３口ナスフラスコ（容量５００mL）に、上記（１）で得られた３−メトキシ−１−シクロオクテン重合体４．５ｇ、ｏ−キシレン１００mL、ｐ−トルエンスルホン酸ヒドラジド２８．８ｇ（１６０mmol）、トリブチルアミン２８．８ｇ（１５５mmol）及び少量（５mg程度）の２，６−ジtertブチル−ヒドロキシトルエン（ＢＨＴ）を加え、得られた溶液を攪拌下に１４０℃に加熱して１７時間還流を行ったところ、反応の進行に伴い黄色均一溶液となるとともに、窒素ガスの生成による気泡の発生が確認された。反応終了後、反応溶液を室温まで冷却した後、大過剰のメタノールに投入し、水素添加３−メトキシ−１−シクロオクテン重合体を沈殿させて回収した。これにより得られた水素添加３−メトキシ−１−シクロオクテン重合体をベンゼンに溶解させた後、メタノールで再沈殿させる作業を３回繰り返して生成を行い、得られた沈殿をさらに水中で２４時間攪拌した。デカントにより水を取り除き、沈殿をＴＨＦに溶解させてポリマーを回収した。溶媒を減圧留去した後、真空乾燥機で乾燥を行い、水素添加３−メトキシ−１−シクロオクテン重合体３．４ｇ（収率７５％）を得た。
（ｉｉ）上記（ｉ）で得られた水素添加３−メトキシ−１−シクロオクテン重合体の水素転化率を^１Ｈ−ＮＭＲで測定したところ、二重結合に由来するピークが消失し、水素転化率は９９％以上であった。得られた水素添加重合体の^１Ｈ−ＮＭＲスペクトルを図６（ａ）に、^１３Ｃ−ＮＭＲスペクトルを図６（ｂ）に示す。また、この水素添加重合体のガラス転移温度を上記した方法で測定したところ、表１に示すように−６８℃であった。 (2) Production of hydrogenated 3-methoxy-1-cyclooctene polymer

(I) In a 3-neck eggplant flask (capacity 500 mL), 4.5 g of the 3-methoxy-1-cyclooctene polymer obtained in the above (1), 100 mL of o-xylene, 28.8 g of p-toluenesulfonic acid hydrazide ( 160 mmol), 28.8 g (155 mmol) of tributylamine and a small amount (about 5 mg) of 2,6-ditertbutyl-hydroxytoluene (BHT) are added and the resulting solution is heated to 140 ° C. with stirring for 17 hours. When refluxing was performed, a yellow homogeneous solution was formed as the reaction proceeded, and generation of bubbles due to the generation of nitrogen gas was confirmed. After completion of the reaction, the reaction solution was cooled to room temperature and then poured into a large excess of methanol to precipitate and collect a hydrogenated 3-methoxy-1-cyclooctene polymer. The hydrogenated 3-methoxy-1-cyclooctene polymer thus obtained was dissolved in benzene and then reprecipitated with methanol three times to produce it, and the resulting precipitate was further submerged in water for 24 hours. Stir. Water was removed by decanting, and the precipitate was dissolved in THF to recover the polymer. After depressurizingly distilling a solvent, it dried with the vacuum dryer and obtained 3.4 g (yield 75%) of hydrogenation 3-methoxy-1- cyclooctene polymer.
(Ii) When the hydrogen conversion rate of the hydrogenated 3-methoxy-1-cyclooctene polymer obtained in (i) above was measured by ¹ H-NMR, the peak derived from the double bond disappeared, and the hydrogen conversion The rate was 99% or more. The ¹ H-NMR spectrum of the obtained hydrogenated polymer is shown in FIG. 6 (a), and the ¹³ C-NMR spectrum is shown in FIG. 6 (b). Moreover, when the glass transition temperature of this hydrogenated polymer was measured by the above-mentioned method, it was -68 degreeC as shown in Table 1.

３口ナスフラスコ（容量１００mL）に、実施例２で得られた３−（２−メトキシエトキシ）−１−シクロオクテン１１．０ｇ（５９．８mmol）、乾燥ＴＨＦ１９mL、cis−４−オクテン３３．６mg（０．３００mmol）を加え、凍結−脱気を繰り返した後、乾燥窒素ガスで反応容器を置換した。第二世代Grubbs触媒２０．３mg（２３．９μmol）を含む乾燥ＴＨＦ溶液（２mL）をシリンジで反応容器内に添加し、６０℃、１６時間、攪拌下に重合させ、次いでエチルビニルエーテル２mLを添加して重合反応を停止した。重合の進行度を^１Ｈ−ＮＭＲ測定により確認した結果、９９％以上であった。得られた重合体溶液の一部を用いて前述した方法で分子量を測定したところ、数平均分子量（Ｍｎ）８３０００及び、分子量分布（Ｍｗ／Ｍｎ）１．３であった。これらの結果を下記の表１に示す。得られた重合体の^１Ｈ−ＮＭＲスペクトルを図７（ａ）に、^１３Ｃ−ＮＭＲスペクトルを図７（ｂ）に示す。また、この重合体のガラス転移温度を上記した方法で測定したところ、表１に示すように−５６℃であった。 Example 6
(1) Production of 3- (2-methoxyethoxy) -1-cyclooctene polymer

In a three-necked eggplant flask (volume 100 mL), 11.0 g (59.8 mmol) of 3- (2-methoxyethoxy) -1-cyclooctene obtained in Example 2, 19 mL of dry THF, 33.6 mg of cis-4-octene (0.300 mmol) was added, freeze-degas was repeated, and the reaction vessel was replaced with dry nitrogen gas. A dry THF solution (2 mL) containing 20.3 mg (23.9 μmol) of the second generation Grubbs catalyst was added to the reaction vessel with a syringe, polymerized with stirring at 60 ° C. for 16 hours, and then 2 mL of ethyl vinyl ether was added. The polymerization reaction was stopped. As a result of confirming the progress of the polymerization by ¹ H-NMR measurement was 99%. When molecular weight was measured by the method mentioned above using a part of obtained polymer solution, they were number average molecular weight (Mn) 83000 and molecular weight distribution (Mw / Mn) 1.3. These results are shown in Table 1 below. FIG. 7 (a) shows the ¹ H-NMR spectrum of the obtained polymer, and FIG. 7 (b) shows the ¹³ C-NMR spectrum. Moreover, when the glass transition temperature of this polymer was measured by the above-mentioned method, it was -56 degreeC as shown in Table 1.

（ｉ）３口ナスフラスコ（容量５００mL）に、上記（１）で得られた３−（２−メトキシエトキシ）−１−シクロオクテン重合体３．０ｇ、ｏ−キシレン１２０mL、ｐ−トルエンスルホン酸ヒドラジド１５．０ｇ（８０．６mmol）、トリブチルアミン２０．９ｇ（１１３mmol）、及び少量（５mg程度）の２，６−ジtertブチル−ヒドロキシトルエン（ＢＨＴ）を加え、得られた溶液を攪拌下に１４０℃に加熱して７時間還流を行ったところ、反応の進行に伴い黄色均一溶液となるとともに、窒素ガスの生成による気泡の発生が確認された。反応終了後、反応溶液を室温まで冷却した後、大過剰のメタノールに投入し、水素添加３−（２−メトキシエトキシ）−１−シクロオクテン重合体を沈殿させて回収した。これにより得られた水素添加３−メトキシ−１−シクロオクテン重合体をベンゼンに溶解させた後、メタノールで再沈殿させる作業を３回繰り返して生成を行い、得られた沈殿をさらに水中で２４時間攪拌した。デカントにより水を取り除き、沈殿をＴＨＦに溶解させてポリマーを回収した。溶媒を減圧留去した後、真空乾燥機で乾燥を行い、水素添加３−（２−メトキシエトキシ）−１−シクロオクテン重合体２．１ｇ（収率６９％）を得た。
（ｉｉ）上記（ｉ）で得られた水素添加３−（２−メトキシエトキシ）−１−シクロオクテン重合体の水素転化率を^１Ｈ−ＮＭＲで測定したところ、二重結合に由来するピークが消失し、水素転化率は９９％以上であった。得られた水素添加重合体の^１Ｈ−ＮＭＲスペクトルを図８（ａ）に、^１３Ｃ−ＮＭＲスペクトルを図８（ｂ）に示す。また、この水素添加重合体のガラス転移温度を上記した方法で測定したところ、表１に示すように−６７℃であった。 (2) Production of hydrogenated 3- (2-methoxyethoxy) -1-cyclooctene polymer

(I) In a 3-neck eggplant flask (capacity 500 mL), 3.0 g of 3- (2-methoxyethoxy) -1-cyclooctene polymer obtained in (1) above, 120 mL of o-xylene, p-toluenesulfonic acid 15.0 g (80.6 mmol) of hydrazide, 20.9 g (113 mmol) of tributylamine and a small amount (about 5 mg) of 2,6-ditertbutyl-hydroxytoluene (BHT) were added and the resulting solution was stirred. When the mixture was heated to 140 ° C. and refluxed for 7 hours, it became a yellow uniform solution as the reaction proceeded, and generation of bubbles due to generation of nitrogen gas was confirmed. After completion of the reaction, the reaction solution was cooled to room temperature and then poured into a large excess of methanol to precipitate and collect a hydrogenated 3- (2-methoxyethoxy) -1-cyclooctene polymer. The hydrogenated 3-methoxy-1-cyclooctene polymer thus obtained was dissolved in benzene and then reprecipitated with methanol three times to produce it, and the resulting precipitate was further submerged in water for 24 hours. Stir. Water was removed by decanting, and the precipitate was dissolved in THF to recover the polymer. After depressurizingly distilling a solvent, it dried with the vacuum dryer and obtained 2.1 g (yield 69%) of hydrogenation 3- (2-methoxyethoxy) -1-cyclooctene polymer.
(Ii) When the hydrogen conversion rate of the hydrogenated 3- (2-methoxyethoxy) -1-cyclooctene polymer obtained in (i) above was measured by ¹ H-NMR, a peak derived from a double bond was observed. The hydrogen conversion rate was 99% or more. The ¹ H-NMR spectrum of the obtained hydrogenated polymer is shown in FIG. 8 (a), and the ¹³ C-NMR spectrum is shown in FIG. 8 (b). Moreover, when the glass transition temperature of this hydrogenated polymer was measured by the above-mentioned method, it was -67 degreeC as shown in Table 1.

３口ナスフラスコ（容量１００mL）に、実施例３で得られた３−［２−（２−メトキシエトキシ）エトキシ］−１−シクロオクテン１１．４ｇ（５０mmol）、乾燥クロロホルム２９mL、cis−４−オクテン２３．９mg（０．２１３mmol）を加え、凍結−脱気を繰り返した後、乾燥窒素ガスで反応容器を置換した。第二世代Grubbs触媒７８．７mg（０．０９３mmol）を含む乾燥ＴＨＦ溶液（２mL）をシリンジで反応容器内に添加し、６０℃、１６時間、攪拌下に重合させ、次いでエチルビニルエーテル２mLを添加して重合反応を停止した。重合の進行度を^１Ｈ−ＮＭＲ測定により確認した結果、７８％であった。得られた重合体溶液の一部を用いて前述した方法で分子量を測定したところ、数平均分子量（Ｍｎ）４６０００及び、分子量分布（Ｍｗ／Ｍｎ）２．４であった。これらの結果を下記の表１に示す。得られた重合体の^１Ｈ−ＮＭＲスペクトルを図９（ａ）に、^１３Ｃ−ＮＭＲスペクトルを図９（ｂ）に示す。また、この重合体のガラス転移温度を上記した方法で測定したところ、表１に示すように−６７℃であった。 Example 7
(1) Production of 3- [2- (2-methoxyethoxy) ethoxy] -1-cyclooctene polymer

In a three-necked eggplant flask (capacity: 100 mL), 11.4 g (50 mmol) of 3- [2- (2-methoxyethoxy) ethoxy] -1-cyclooctene obtained in Example 3, 29 mL of dry chloroform, cis-4- After adding 23.9 mg (0.213 mmol) of octene and repeating freeze-deaeration, the reaction vessel was replaced with dry nitrogen gas. A dry THF solution (2 mL) containing 78.7 mg (0.093 mmol) of the second generation Grubbs catalyst was added to the reaction vessel with a syringe, polymerized with stirring at 60 ° C. for 16 hours, and then 2 mL of ethyl vinyl ether was added. The polymerization reaction was stopped. The progress of the polymerization was confirmed by ¹ H-NMR measurement and found to be 78%. When molecular weight was measured by the method mentioned above using a part of obtained polymer solution, they were number average molecular weight (Mn) 46000 and molecular weight distribution (Mw / Mn) 2.4. These results are shown in Table 1 below. FIG. 9 (a) shows the ¹ H-NMR spectrum of the obtained polymer, and FIG. 9 (b) shows the ¹³ C-NMR spectrum. Moreover, when the glass transition temperature of this polymer was measured by the above-mentioned method, it was -67 degreeC as shown in Table 1.

（ｉ）３口ナスフラスコ（容量５００mL）に、上記（１）で得られた３−［２−（２−メトキシエトキシ）エトキシ］−１−シクロオクテン重合体１．８ｇ、ｏ−キシレン１００mL、ｐ−トルエンスルホン酸ヒドラジド７．３３ｇ（３９．４mmol）、トリブチルアミン１０．５ｇ（５６．４mmol）、及び少量（５mg程度）の２，６−ジtertブチル−ヒドロキシトルエン（ＢＨＴ）を加え、得られた溶液を攪拌下に１４０℃に加熱して７時間還流を行ったところ、反応の進行に伴い黄色均一溶液となるとともに、窒素ガスの生成による気泡の発生が確認された。反応終了後、反応溶液を室温まで冷却した後、大過剰の水に投入し、水素添加３−［２−（２−メトキシエトキシ）エトキシ］−１−シクロオクテン重合体を沈殿させて回収した。これにより得られた水素添加３−［２−（２−メトキシエトキシ）エトキシ］−１−シクロオクテン重合体をＴＨＦに溶解させた後、水で再沈殿させる作業を３回繰り返して生成を行い、得られた沈殿をさらに水中で２４時間攪拌した。デカントにより水を取り除き、沈殿をＴＨＦに溶解させてポリマーを回収した。溶媒を減圧留去した後、真空乾燥機で乾燥を行い、水素添加３−［２−（２−メトキシエトキシ）エトキシ］−１−シクロオクテン重合体０．４０ｇ（収率２２％）を得た。
（ｉｉ）上記（ｉ）で得られた水素添加３−［２−（２−メトキシエトキシ）エトキシ］−１−シクロオクテン重合体の水素転化率を^１Ｈ−ＮＭＲで測定したところ、二重結合に由来するピークが消失し、水素転化率は９９％以上であった。得られた水素添加重合体の^１Ｈ−ＮＭＲスペクトルを図１０（ａ）に、^１３Ｃ−ＮＭＲスペクトルを図１０（ｂ）に示す。また、この水素添加重合体のガラス転移温度を上記した方法で測定したところ、表１に示すように−７５℃であった。 (2) Production of hydrogenated 3- [2- (2-methoxyethoxy) ethoxy] -1-cyclooctene polymer

(I) In a 3-neck eggplant flask (capacity: 500 mL), 1.8 g of the 3- [2- (2-methoxyethoxy) ethoxy] -1-cyclooctene polymer obtained in (1) above, 100 mL of o-xylene, 7.33 g (39.4 mmol) of p-toluenesulfonic acid hydrazide, 10.5 g (56.4 mmol) of tributylamine, and a small amount (about 5 mg) of 2,6-ditertbutyl-hydroxytoluene (BHT) were obtained. When the obtained solution was heated to 140 ° C. with stirring and refluxed for 7 hours, a yellow homogeneous solution was formed as the reaction proceeded, and generation of bubbles due to generation of nitrogen gas was confirmed. After completion of the reaction, the reaction solution was cooled to room temperature and then poured into a large excess of water to precipitate and collect a hydrogenated 3- [2- (2-methoxyethoxy) ethoxy] -1-cyclooctene polymer. After the hydrogenated 3- [2- (2-methoxyethoxy) ethoxy] -1-cyclooctene polymer thus obtained was dissolved in THF, the operation of reprecipitation with water was repeated three times, and production was performed. The resulting precipitate was further stirred in water for 24 hours. Water was removed by decanting, and the precipitate was dissolved in THF to recover the polymer. After the solvent was distilled off under reduced pressure, drying was performed with a vacuum drier to obtain 0.40 g (yield 22%) of a hydrogenated 3- [2- (2-methoxyethoxy) ethoxy] -1-cyclooctene polymer. .
(Ii) When the hydrogen conversion rate of the hydrogenated 3- [2- (2-methoxyethoxy) ethoxy] -1-cyclooctene polymer obtained in (i) above was measured by ¹ H-NMR, a double bond was obtained. Disappeared, and the hydrogen conversion was 99% or more. FIG. 10 (a) shows the ¹ H-NMR spectrum of the obtained hydrogenated polymer, and FIG. 10 (b) shows the ¹³ C-NMR spectrum. Moreover, when the glass transition temperature of this hydrogenated polymer was measured by the above-mentioned method, it was -75 degreeC as shown in Table 1.

３口ナスフラスコ（容量１００mL）に、実施例２で得られた３−（２−メトキシエトキシカルボニル）−１−シクロオクテン９．２ｇ（４３．４mmol）、乾燥ＴＨＦ１０mL、cis−４−オクテン２３．３mg（０．２０８mmol）を加え、凍結−脱気を繰り返した後、乾燥窒素ガスで反応容器を置換した。第二世代Grubbs触媒１３．６mg（１６．０μmol）を含む乾燥ＴＨＦ溶液（１．０mL）をシリンジで反応容器内に添加し、６０℃、１６時間、攪拌下に重合させ、次いでエチルビニルエーテル０．２mLを添加して重合反応を停止した。重合の進行度を^１Ｈ−ＮＭＲ測定により確認した結果、９９％以上であった。得られた重合体溶液の一部を用いて前述した方法で分子量を測定したところ、数平均分子量（Ｍｎ）３８０００及び、分子量分布（Ｍｗ／Ｍｎ）１．６であった。これらの結果を下記の表１に示す。また、得られた重合体の^１Ｈ−ＮＭＲスペクトルを図１１（ａ）に、^１３Ｃ−ＮＭＲスペクトルを図１１（ｂ）に示す。 Example 8
(1) Production of 3- (2-methoxyethoxycarbonyl) -1-cyclooctene polymer

In a three-necked eggplant flask (volume: 100 mL), 9.2 g (43.4 mmol) of 3- (2-methoxyethoxycarbonyl) -1-cyclooctene obtained in Example 2, 10 mL of dry THF, 23. cis-4-octene. After adding 3 mg (0.208 mmol) and repeating freeze-deaeration, the reaction vessel was replaced with dry nitrogen gas. A dry THF solution (1.0 mL) containing 13.6 mg (16.0 μmol) of the second generation Grubbs catalyst was added to the reaction vessel with a syringe, polymerized with stirring at 60 ° C. for 16 hours, The polymerization reaction was stopped by adding 2 mL. As a result of confirming the degree of progress of the polymerization by ¹ H-NMR measurement, it was 99% or more. When molecular weight was measured by the method mentioned above using a part of obtained polymer solution, they were number average molecular weight (Mn) 38000 and molecular weight distribution (Mw / Mn) 1.6. These results are shown in Table 1 below. Further, FIG. 11 (a) shows the ¹ H-NMR spectrum of the obtained polymer, and FIG. 11 (b) shows the ¹³ C-NMR spectrum.

（ｉ）３口ナスフラスコ（容量３００mL）に、上記（１）で得られた３−（２−メトキシエトキシカルボニル）−１−シクロオクテン重合体１．５ｇ、ｏ−キシレン１００mL、ｐ−トルエンスルホン酸ヒドラジド６．６ｇ（３５．４mmol）、トリブチルアミン６．７ｇ（３６．１mmol）及び少量（５mg程度）の２，６−ジtertブチル−ヒドロキシトルエン（ＢＨＴ）を加え、得られた溶液を攪拌下に１４０℃に加熱して２０時間還流を行ったところ、反応の進行に伴い黄色均一溶液となるとともに、窒素ガスの生成による気泡の発生が確認された。反応終了後、反応溶液を室温まで冷却した後、大過剰のメタノールに投入し、水素添加３−（２−メトキシエトキシ）−１−シクロオクテン重合体を沈殿させて回収した。これにより得られた水素添加３−メトキシ−１−シクロオクテン重合体をベンゼンに溶解させた後、メタノールで再沈殿させる作業を３回繰り返して生成を行い、得られた沈殿をさらに水中で１２時間攪拌した。デカントにより水を取り除き、沈殿をＴＨＦに溶解させてポリマーを回収した。溶媒を減圧留去した後、真空乾燥機で乾燥を行い、水素添加３−（２−メトキシエトキシカルボニル）−１−シクロオクテン重合体１．３２ｇ（収率８８％）を得た。
（ｉｉ）上記（ｉ）で得られた水素添加３−（２−メトキシエトキシカルボニル）−１−シクロオクテン重合体の水素転化率を^１Ｈ−ＮＭＲで測定したところ、二重結合に由来するピークが消失し、水素転化率は９９％以上であった。得られた水素添加重合体の^１Ｈ−ＮＭＲスペクトルを図１２（ａ）に、^１３Ｃ−ＮＭＲスペクトルを図１２（ｂ）に示す。また、この重合体のガラス転移温度を上記した方法で測定したところ、表１に示すように−５３℃であった。 (2) Production of hydrogenated 3- (2-methoxyethoxycarbonyl) -1-cyclooctene polymer

(I) In a 3-neck eggplant flask (volume: 300 mL), 1.5 g of 3- (2-methoxyethoxycarbonyl) -1-cyclooctene polymer obtained in (1) above, 100 mL of o-xylene, p-toluenesulfone 6.6 g (35.4 mmol) of acid hydrazide, 6.7 g (36.1 mmol) of tributylamine and a small amount (about 5 mg) of 2,6-ditertbutyl-hydroxytoluene (BHT) were added and the resulting solution was stirred. When the mixture was heated to 140 ° C. and refluxed for 20 hours, it became a yellow uniform solution as the reaction proceeded, and generation of bubbles due to the generation of nitrogen gas was confirmed. After completion of the reaction, the reaction solution was cooled to room temperature and then poured into a large excess of methanol to precipitate and collect a hydrogenated 3- (2-methoxyethoxy) -1-cyclooctene polymer. The hydrogenated 3-methoxy-1-cyclooctene polymer thus obtained was dissolved in benzene and then reprecipitated with methanol three times to produce it, and the resulting precipitate was further washed in water for 12 hours. Stir. Water was removed by decanting, and the precipitate was dissolved in THF to recover the polymer. After depressurizingly distilling a solvent, it dried with the vacuum dryer and obtained hydrogenated 3- (2-methoxyethoxycarbonyl) -1-cyclooctene polymer 1.32g (yield 88%).
(Ii) When the hydrogen conversion of the hydrogenated 3- (2-methoxyethoxycarbonyl) -1-cyclooctene polymer obtained in (i) above was measured by ¹ H-NMR, a peak derived from a double bond Disappeared, and the hydrogen conversion was 99% or more. The ¹ H-NMR spectrum of the obtained hydrogenated polymer is shown in FIG. 12 (a), and the ¹³ C-NMR spectrum is shown in FIG. 12 (b). Moreover, when the glass transition temperature of this polymer was measured by the above-mentioned method, it was -53 degreeC as shown in Table 1.

３口ナスフラスコ（容量３００mL）に、cis−シクロオクテン１５．０ｇ（１３６mmol）、乾燥ＴＨＦ６８mL、cis−４−オクテン０．７６４ｇ（０．６８２mmol）を加え、凍結−脱気を繰り返した後、乾燥窒素ガスで反応容器を置換した。第二世代Grubbs触媒２３．３mg（２７．４μmol）を含む乾燥ＴＨＦ溶液（２．０mL）をシリンジで反応容器内に添加し、６０℃、１６時間、攪拌下に重合させ、次いでエチルビニルエーテル２mLを添加して重合反応を停止した。重合の進行度を^１Ｈ−ＮＭＲ測定により確認した結果、９９％以上であった。得られた重合体溶液の一部を用いて前述した方法で分子量を測定したところ、数平均分子量（Ｍｎ）３７０００及び、分子量分布（Ｍｗ／Ｍｎ）１．７であった。これらの結果を下記の表１に示す。また、この重合体のガラス転移温度を上記した方法で測定したところ、表１に示すように−７０℃であった。 ≪Comparative example 1≫
(1) Production of cis-cyclooctene polymer

To a three-necked eggplant flask (capacity 300 mL) was added cis-cyclooctene 15.0 g (136 mmol), dry THF 68 mL, cis-4-octene 0.764 g (0.682 mmol), repeated freeze-deaeration, and then dried. The reaction vessel was replaced with nitrogen gas. A dry THF solution (2.0 mL) containing 23.3 mg (27.4 μmol) of the second generation Grubbs catalyst was added to the reaction vessel with a syringe, polymerized with stirring at 60 ° C. for 16 hours, and then 2 mL of ethyl vinyl ether was added. The polymerization reaction was stopped by adding. As a result of confirming the degree of progress of the polymerization by ¹ H-NMR measurement, it was 99% or more. When molecular weight was measured by the method mentioned above using a part of obtained polymer solution, they were number average molecular weight (Mn) 37000 and molecular weight distribution (Mw / Mn) 1.7. These results are shown in Table 1 below. Moreover, when the glass transition temperature of this polymer was measured by the above-mentioned method, it was -70 degreeC as shown in Table 1.

（ｉ）３口ナスフラスコ（容量５００mL）に、上記（１）で得られたcis−１−シクロオクテン重合体６．０ｇ、ｏ−キシレン２５０mL、ｐ−トルエンスルホン酸ヒドラジド４９．９ｇ（５３．６mmol）、トリブチルアミン４９．７ｇ（５３．６mmol）及び少量（５mg程度）の２，６−ジtertブチル−ヒドロキシトルエン（ＢＨＴ）を加え、得られた溶液を攪拌下に１４０℃に加熱して４時間還流を行ったところ、反応の進行に伴い黄色均一溶液となるとともに、窒素ガスの生成による気泡の発生が確認された。反応終了後、反応溶液を室温まで冷却した後、大過剰のメタノールに投入し、水素添加cis−１−シクロオクテン重合体を沈殿させて回収した。これにより得られた水素添加cis−１−シクロオクテン重合体を熱ｏ−キシレンに溶解させた後、メタノールで再沈殿させる作業を３回繰り返して精製を行い、さらに水中で２４時間攪拌した。吸引ろ過により水を取り除いた後、得られた白色固体を真空乾燥機で乾燥を行い、水素添加cis−１−シクロオクテン重合体５．８ｇ（収率９５％）を得た。
（ｉｉ）上記（ｉ）で得られた水素添加cis−１−シクロオクテン重合体の水素転化率を^１Ｈ−ＮＭＲで測定したところ、二重結合に由来するピークが消失し、水素転化率は９９％以上であった。また、この水素添加重合体のガラス転移温度を上記した方法で測定したところ、３０℃から−１００℃までの範囲内には観察されなかった。 (2) Production of hydrogenated cis-cyclooctene polymer

(I) In a three-necked eggplant flask (capacity: 500 mL), 6.0 g of the cis-1-cyclooctene polymer obtained in (1) above, 250 mL of o-xylene, 49.9 g of p-toluenesulfonic acid hydrazide (53. 6 mmol), 49.7 g (53.6 mmol) of tributylamine and a small amount (about 5 mg) of 2,6-ditertbutyl-hydroxytoluene (BHT) are added and the resulting solution is heated to 140 ° C. with stirring. When refluxing was performed for 4 hours, a yellow homogeneous solution was formed as the reaction proceeded, and generation of bubbles due to the generation of nitrogen gas was confirmed. After completion of the reaction, the reaction solution was cooled to room temperature and then poured into a large excess of methanol to precipitate and collect a hydrogenated cis-1-cyclooctene polymer. The thus obtained hydrogenated cis-1-cyclooctene polymer was dissolved in hot o-xylene and then purified by repeating the operation of reprecipitation with methanol three times, and further stirred in water for 24 hours. After removing water by suction filtration, the obtained white solid was dried with a vacuum dryer to obtain 5.8 g of hydrogenated cis-1-cyclooctene polymer (yield 95%).
(Ii) When the hydrogen conversion rate of the hydrogenated cis-1-cyclooctene polymer obtained in (i) above was measured by ¹ H-NMR, the peak derived from the double bond disappeared, and the hydrogen conversion rate was It was 99% or more. Moreover, when the glass transition temperature of this hydrogenated polymer was measured by the above-mentioned method, it was not observed in the range from 30 degreeC to -100 degreeC.

  Table 1 shows a summary of the physical properties of the polymer compositions obtained in Examples 5 to 8 and Comparative Example 1. Moreover, in order to confirm the presence or absence of intermediate water, the result of having performed DSC measurement about the polymer composition obtained by Examples 5-8 and the comparative example 1 is shown to FIGS. In the DSC chart, when the release of latent heat is observed at around -40 ° C or the absorption of latent heat is observed below the freezing point of -10 ° C or higher, intermediate water is present.

  As is apparent from the tables and figures above, the polymer composition of the present invention retains intermediate water, which indicates that the polymer composition of the present invention is suitable for use as a biocompatible material. Show. On the other hand, the presence of intermediate water was not confirmed in the polymer of the comparative example.

According to the present invention, the polymer composition of the present invention can be used as a biocompatible material that is difficult to adhere to substances that cause blood coagulation and promotes the repair of the living body. The polymer composition of the present invention can be used, for example, as a surface treatment agent for medical devices such as artificial blood vessels or medical devices that may come into contact with living bodies such as stents.

Claims (12)

  It has a 4- to 13-membered cyclic structure having a carbon-carbon unsaturated bond, and is at least at the allylic position (3-position) of the cyclic structure, a substituent containing an ether structure, or electrically neutral in a biological environment. A method for preparing a biocompatible polymer, comprising a step of ring-opening polymerization of a cyclic compound to which a substituent containing betaine is bonded to obtain a polymer.   The method for preparing a biocompatible polymer according to claim 1, wherein a Grubbs catalyst is used in the ring-opening polymerization of the cyclic compound.   2. The method according to claim 1, further comprising a step of reducing at least part of unsaturated bonds contained in a main chain portion of the polymer composition obtained by ring-opening polymerization of the cyclic compound to form saturated bonds. A method for preparing the biocompatible polymer according to claim 2.   The method for preparing a biocompatible polymer according to any one of claims 1 to 3, wherein the number of carbon-carbon unsaturated bonds contained in the cyclic compound is 1 or 2.   The method for preparing a biocompatible polymer according to any one of claims 1 to 4, wherein the ether structure includes at least one of a cyclic ether and a chain ether.   The biocompatible polymer according to any one of claims 1 to 4, wherein the betaine that is electrically neutral in the biological environment is any one of phosphobetaine, carboxybetaine, and sulfobetaine. Method. A main chain having a sequence of carbon atoms bonded to each other, and a substituent containing an ether structure on a part of the carbon atoms or a substituent containing betaine that is electrically neutral in a biological environment is on the side of the main chain. A biocompatible polymer linked as a chain,
A composition for use as a medical material, comprising a biocompatible polymer, wherein the carbon atom sequence includes a portion in which two or more carbon atoms to which side chains are not bonded are continuously present. .   The ratio of carbon atoms to which carbon atoms contained in the main chain of the polymer are bonded to a side chain containing a substituent containing an ether structure or a substituent containing an electrically neutral betaine in a biological environment is ½ The composition according to claim 7, wherein the composition is less than 8.   9. The positional specificity for a side chain containing a substituent containing an ether structure or a substituent containing an electrically neutral betaine in a biological environment is 90% or more. The composition according to any one of the above.   A device using at least a part of the composition according to any one of claims 7 to 9. In the name of 3- (2-methoxyethoxy) -1-cyclooctene, 3- [2- (2-methoxyethoxy) ethoxy] -1-cyclooctene or 3- (2-methoxyethoxycarbonyl) -1-cyclooctene cyclic compound that will be identified.   The cyclic compound according to claim 11, wherein the cyclic compound is used as a monomer for ring-opening polymerization.

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