JP2007186512A - Fumaric acid derivative and ophthalmic lens using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a new fumaric acid derivative that has improved compatibility with another monomer to be used together, especially a hydrophilic monomer while making the best use of advantages such as transparency, mechanical strength, oxygen permeability, etc., being excellent characteristics of a case using a fumaric acid derivative monomer and an ophthalmic lens such as contact lens, intraocular lens, etc., using the same. <P>SOLUTION: The fumaric acid derivative is a fumaric acid diester containing a hydrophilic group and a silicon-containing alkyl group in the same molecule, provides excellent oxygen permeability by including a silicon-containing alkyl in the molecular structure and on the other hand, improves compatibility with another hydrophilic monomer by including a hydrophilic substituent group in the same molecule. When the ophthalmic lens obtained by polymerizing a monomer composition containing the fumaric acid derivative is constituted, for example, as a hydrous lens, the fumaric acid derivative has excellent compatibility with a hydrophilic monomer to be used together and is combined in various mixing ratios, to give a lens having high oxygen permeability and transparency not depending upon a water content. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fumaric acid derivative and an ophthalmic lens using the same. More specifically, the present invention relates to a contact lens or an intraocular lens which is a fumaric acid derivative having a hydrophilic group and a silicon-containing alkyl group in the same molecule.

  In the field of medical materials, particularly ophthalmic lens materials such as contact lenses or intraocular lenses, various monomers that can be used as the materials have been studied. Above all, the fumaric acid ester type has been proposed more than ever since it exhibits excellent physical properties such as transparency, mechanical strength and oxygen permeability when processed into a lens. Each of these physical properties is a characteristic that must be included in a substance used as a material for the ophthalmic lens because it is used in direct contact with a living body.

  Fumaric acid is a white crystalline powder and is a substance widely used industrially as a food additive, a pharmaceutical raw material, a bath agent and the like. The chemical structural formula has two carboxyl groups across a hydrocarbon group having an unsaturated bond, and by introducing various substituents into the carboxyl group by ester bonds, a fumarate ester-based contact lens It has been studied as a raw material monomer. For example, for dialkyl fumarate having a hydrophobic alkyl group such as linear or branched alkyl or cycloalkyl as a substituent, phosphorylcholine is disclosed in JP-B-2-50450, JP-B-6-85030, JP-B-8-23630, etc. Those in which a hydrophilic substituent such as a group or a hydroxyalkyl group is introduced are disclosed in Japanese Patent No. 3240696, Japanese Patent No. 3227811, Japanese Patent No. 3612349, and the like. In addition, di- (silicon-containing alkyl) fumarate having a silicon-containing alkyl is disclosed in JP-B-6-77115, Japanese Patent No. 30505586, Japanese Patent No. 3453224, and the like. Respectively.

  The various types of fumarate are so-called symmetrical types in which the substituents are basically the same. These fumarate are synthesized mainly for the purpose of improving oxygen permeability and actually exhibit excellent characteristics. On the other hand, although partially disclosed in each of the above publications, so-called asymmetric types having different substituents have also been studied, for example, fumarate having silicon-containing alkyl and fluoroalkyl (Japanese Patent Publication No. 6-25832) and the like. , Fumarate having linear / branched or cyclic alkyl and polyoxyethylene chain (JP-A-4-335007 etc.), fumarate having C1-20 alkyl and phosphorylcholine (WO97 / 8177 etc.) as contact lenses There is an example used.

  These not only promote oxygen supply to the cornea when used as a contact lens, but also aim for moderate water wettability, transparency as an optical material, biocompatibility, stain resistance, etc. Is being developed.

  By the way, although the fumaric acid ester proposed by the above publications can provide a lens material having excellent oxygen permeability, in the market, silicon-containing methacrylate or polydimethylsiloxane macromer is used. The current situation is that the mainstream of lens materials has been handed over. The contact lens field is broadly divided into oxygen-permeable hard lenses, hydrous soft contact lenses, and silicone hydrogel soft contact lenses that have been recently launched. Contained methacrylate or the macromer is used, and hydrated soft contact lenses use acrylamide monomers, N-vinyl lactam, 2-hydroxymethyl methacrylate, methacrylic acid, and the like.

  The reason why a lens that actually employs a fumarate ester is not easily produced is that it is not always appropriate to specify it. When used in combination with other general-purpose monomers, there is a problem in compatibility between the monomers. That is, in order to improve oxygen permeability, it is desirable to use a large amount of a fumaric acid ester having a silicon-containing alkyl as a locating group. However, in order to guarantee an appropriate water wettability of the lens material, a hydrophilic monomer is used. It is necessary to copolymerize. However, since silicon-containing alkyl fumarate is generally not compatible with hydrophilic monomers, it is limited to use in a limited composition ratio, and when it is intended to obtain a hydrous soft contact lens. In addition to problems inherent in compatibility, it is difficult to obtain a uniform polymer due to a difference in polymerization reactivity between monomers used together, and problems such as white turbidity after water content are likely to occur.

  JP 2-50450   Japanese Patent Publication No. 6-85030   Japanese Patent Publication No. 8-23630   Patent 3240696   Japanese Patent No. 3227811   Japanese Patent No. 3612349   JP 6-77115   Japanese Patent No. 3050586   Japanese Patent No. 3453224   Japanese Patent Publication No.6-25832   JP-A-4-335007   WO97 / 8177

  The object of the present invention has been made in view of the above prior art, while taking advantage of advantages such as transparency, mechanical strength, oxygen permeability, etc., which are excellent characteristics when a fumaric acid derivative monomer is used. It is to provide a novel fumaric acid derivative capable of improving the compatibility with a combination monomer, particularly hydrophilic monomers, and an ophthalmic lens such as a contact lens or an intraocular lens using the same.

  And, in the present invention, as a result of intensive studies to solve the above-mentioned problems, the above object is achieved by introducing a hydrophilic substituent into one of the carboxyl groups of fumaric acid and introducing a silicon-containing alkyl into the other. The inventors have found what can be done and have completed the present invention.

［式中、Ｙ_１はＯまたはＮＲ_１（Ｒ_１は水素、炭素数１〜３のアルキル基、アリール基の群から選ばれる基）であり；
Ｒは炭素数１〜１０のヒドロキシアルキル基、−（ＣＨ_２ＣＨ_２Ｏ）ｍ−Ａ基（ｍは１〜１０の整数、Ａは水素、メチル又はエチルを示す）、下記式：

から選択される基であり；
Ｙ_２は直鎖または分岐の炭素数３〜１０のアルキレン、フェニレン、シクロヘキシレン、−（ＣＨ_２ＣＨ_２Ｏ）ｏ−ＣＨ_２ＣＨ_２ＣＨ_２−基（ｏは１から１０の整数）、下記式：

で示される基であり；
Ｘ_１、Ｘ_２、Ｘ_３はそれぞれ独立にメチル基、トリメチルシロキシ基、Ｓｉ原子力が１８個以下のオルガノシロキシ基を示す］That is, the present invention is obtained by polymerizing a fumaric acid derivative having a hydrophilic group (R) represented by the following general formula (1) and a silicon-containing alkyl group, and a composition containing the same. Related to lenses.

[Wherein Y ₁ is O or NR ₁ (R ₁ is a group selected from the group consisting of hydrogen, an alkyl group having 1 to 3 carbon atoms, and an aryl group);
R is a hydroxyalkyl group having 1 to 10 carbon _{atoms, - (CH 2 CH 2 O} ) m-A group (m is an integer of from 1 to 10, A is a hydrogen, methyl or ethyl), the following formula:

A group selected from:
Y ₂ is linear or branched alkylene having 3 to 10 carbon atoms, phenylene, cyclohexylene, — (CH ₂ CH ₂ O) o —CH ₂ CH ₂ CH ₂ — group (where o is an integer of 1 to 10), formula:

A group represented by:
X ₁ , X ₂ , and X ₃ each independently represent a methyl group, a trimethylsiloxy group, or Si atomic energy represents 18 or less organosiloxy groups]

  The fumaric acid derivative of the present invention provides excellent oxygen permeability by having a silicon-containing alkyl in the molecular structure, while having compatibility with other hydrophilic monomers by having a hydrophilic substituent in the same molecule. Was able to improve. In addition, the ophthalmic lens obtained by polymerizing the monomer composition containing the fumaric acid derivative is a lens material having not only high oxygen permeability but also high surface hydrophilicity when configured as a hard lens. On the other hand, when it is configured as a water-containing lens, it is excellent in compatibility with the hydrophilic monomer used in combination, can be combined with various mixing ratios, and satisfies a high oxygen permeability independent of the water content. be able to.

［式中、Ｙ_１はＯまたはＮＲ_１（Ｒ_１は水素、炭素数１〜３のアルキル基、アリール基の群から選ばれる基）であり；
Ｒは炭素数１〜１０のヒドロキシアルキル基、−（ＣＨ_２ＣＨ_２Ｏ）ｍ−Ａ基（ｍは１〜１０の整数、Ａは水素、メチル又はエチルを示す）、下記式：

から選択される基であり；
Ｙ_２は直鎖または分岐の炭素数３〜１０のアルキレン、フェニレン、シクロヘキシレン、−（ＣＨ_２ＣＨ_２Ｏ）ｏ−ＣＨ_２ＣＨ_２ＣＨ_２−基（ｏは１から１０の整数）、下記式：

で示される基であり；
Ｘ_１、Ｘ_２、Ｘ_３はそれぞれ独立にメチル基、トリメチルシロキシ基、Ｓｉ原子が１８個以下のオルガノシロキシ基を示す］で示される。Hereinafter, the fumaric acid derivative of the present invention and the synthesis method thereof will be described in more detail. The fumaric acid derivative of the present invention has the general formula (1):

[Wherein Y ₁ is O or NR ₁ (R ₁ is a group selected from the group consisting of hydrogen, an alkyl group having 1 to 3 carbon atoms, and an aryl group);
R is a hydroxyalkyl group having 1 to 10 carbon _{atoms, - (CH 2 CH 2 O} ) m-A group (m is an integer of from 1 to 10, A is a hydrogen, methyl or ethyl), the following formula:

A group selected from:
Y ₂ is linear or branched alkylene having 3 to 10 carbon atoms, phenylene, cyclohexylene, — (CH ₂ CH ₂ O) o —CH ₂ CH ₂ CH ₂ — group (where o is an integer of 1 to 10), formula:

A group represented by:
X ₁ , X ₂ and X ₃ each independently represent a methyl group, a trimethylsiloxy group or an organosiloxy group having 18 or less Si atoms.

R—Y ₁ — in the general formula (1) is obtained by introducing a hydrophilic substituent into one carboxyl group of fumaric acid, and when Y ₁ is oxygen (O), an ester with an alcohol. When it is -NR _1- by a bond, it forms an amide bond with a primary or secondary amine to introduce a hydrophilic substituent. This ester bond or amide bond itself imparts some hydrophilicity to the compound, but the subsequent substituent R further improves the hydrophilization.

Examples of the hydroxyalkyl group having 1 to 10 carbon atoms of R include one —OH such as 2-hydroxyethyl, 2-hydroxypropyl, 2-hydroxybutyl, 5-hydroxydecalyl, 6-hydroxydecalyl and the like. And alkyl having two or more —OH in the molecule, such as dihydroxypropyl, dihydroxybutyl, trihydroxypropyl, trihydroxybutyl, tetrahydroxypentyl, pentahydroxyhexyl, hexahydroxyheptyl, and the like. _{Also, - (CH 2 CH 2 O} ) m-A group (m is an integer of from 1 to 10, A is a hydrogen, methyl or ethyl) as an example of, diethylene glycol, triethylene glycol, tetraethylene glycol, Nonaechiren Examples include glycol, 2-methoxyethylene, 2-ethoxyethylene, diethylene glycol methyl ether, and triethylene glycol methyl ether. Of these, 2-hydroxyethyl, 2-methoxyethylene, diethylene glycol, (2-methoxyethoxy) ethylene, triethylene glycol, [2- (2- Methoxyethoxy) ethoxy] ethylene is preferred. These can be easily obtained as commercial products, and cost reduction can be achieved.

で示される基であってもよい。これらは通常シリコン含有アルキルに結合してフマル酸に同時に導入されるので、シリコン含有アルキルの選択に際して適宜決定されるが、プロピレンによるものが一般的であり、入手し易いものでもある。Y ₂ in the general formula (1) is a group that bonds the carboxyl group of fumaric acid and the silicon-containing alkyl. Here, examples of the linear or branched alkylene having 3 to 10 carbon atoms include propylene, n-butylene, pentylene, hexylene, isopropylene, and isobutylene. The phenylene or cyclohexylene in addition to _{the, - (CH 2 CH 2 O} ) o-CH 2 CH 2 CH 2 - group (o is the integer from 1 to 10), or the following formula:

The group shown by these may be sufficient. Since these are usually bonded to the silicon-containing alkyl and simultaneously introduced into the fumaric acid, they are appropriately determined upon selection of the silicon-containing alkyl, but those based on propylene are common and easily available.

X ₁ , X ₂ and X ₃ in the formula (1) are each independently methyl, trimethylsiloxy, pentamethyldisiloxy, methylbis (trimethylsiloxy) siloxy, tris (pentamethylsiloxy) siloxy, trimethylsiloxydimethylsiloxy, methylbis (Trimethylsiloxy) siloxy, mono [methylbis (trimethylsiloxy) siloxy] bis (trimethylsiloxy) siloxy, tris [methylbis (trimethylsiloxy) siloxy] siloxy, mono [methylbis (trimethylsiloxy) siloxy] bis (trimethylsiloxy) siloxy, nona Methyltetrasiloxy, pentadecamethylheptacyloxy, heptacosamethyltridecacyloxy, tris (pentamethyldisiloxy) siloxy, nonamethyltetrasiloxyundecylmethyl Ntashirokishi, Nonakisu (trimethylsiloxy) tetrasiloxy include organosiloxy group Si atoms 18 or less, such as. Moreover, the terminal of the organosiloxy group may be alkyl such as methyl, ethyl, butyl, amyl, or the like, or alkyl in which these hydrogens are fluorine-substituted. Among the above examples, a trimethylsiloxy group is preferable because it is easily available.

  The fumaric acid derivative of the present invention can be synthesized by the following reaction as an example. First, maleic acid monoester is obtained by ring-opening addition reaction between maleic anhydride and an alcohol or polyhydric alcohol having a substituent to be introduced as a hydrophilic substituent. The resulting maleic acid monoester is isomerized to a fumaric acid monoester in the presence of thionyl chloride, and the fumaric acid monoester is further chlorinated (see JP-A-9-77861, JP-A-2002-265417, etc.). The fumaric acid monoester chloride thus obtained is reacted with an alcohol having a silicon-containing alkyl group to synthesize the desired fumaric acid diester.

  More specifically, a synthetic route shown in the following reaction formula can be adopted.

  Examples of the alcohol or polyhydric alcohol include 2-methoxyether, 2 (2-methoxyethoxy) ethanol, 2- [2- (2-methoxyethoxy) ethoxy] ethanol, 1-methoxy-2-propanol, 2 ( 2-methoxypropoxy) propanol, 3-methoxy-3-methyl-1-butanol, 4-methoxy-4-methyl-2-pentanol, methoxyphenol, 2-methoxy-4-methylphenol, 4-methoxybenzyl alcohol, In addition to alcohols such as 2-ethoxyethanol, 2 (2-ethoxyethoxy) ethanol, 2- (dimethylamino) ethanol, 2- (2-oxopyrrolidinyl) ethanol, ethylene glycol, propylene glycol, diethylene glycol, dipropylene Glycol, 1, - butanediol, 1,4-butanediol, polyhydric alcohols such as 1,6-hexanediol and the like. Moreover, amines, such as 2-methoxyethylamine and 3-methoxybutylamine, can also be used as those that form an amide bond with maleic anhydride to form a ring-opening addition reaction. Of these, 2-methoxyether, 2 (2-methoxyethoxy) ethanol, 2- [2- (2-methoxyethoxy) ethoxy] ethanol, and hydroxyethylpyrrolidone are preferable from the viewpoint of easy availability and cost.

  Although this ring-opening addition reaction of maleic anhydride proceeds easily, the alcohol and the like are in a molar ratio range of 0.8 to 1.2, more preferably 0.9 to 1 with respect to 1 mol of maleic anhydride. It is desirable to use within the range of .1. This is because if the molar ratio is less than 0.8, the reaction yield decreases, and if the molar ratio exceeds 1.2, side reactions are likely to occur. The temperature during the reaction is preferably in the range of 40 to 150 ° C., and the reaction time is preferably in the range of 1 to 6 hours. If the temperature is lower than the temperature, the reaction proceeds slowly, and if the temperature is higher than the temperature, side reactions are likely to occur. At this time, an appropriate amount of a reaction solvent such as tetrahydrofuran, toluene, benzene, acetone, ethyl acetate, diethyl ether, isopropyl ether or a tertiary amine such as triethylamine should be used in order to make the reaction proceed uniformly. preferable.

  Next, thionyl chloride used for the isomerization reaction is also used for the fumaric acid chloride reaction in the subsequent step. The amount used is preferably in the range of 2 to 10 mole ratio, more preferably in the range of 3 to 5 with respect to 1 mole of maleic acid monoester. This is because if the molar ratio is less than 2, the reaction yield decreases, and if the molar ratio exceeds 10, the side reaction tends to occur. The temperature during the reaction is preferably in the range of 20 to 110 ° C., and the reaction time is preferably in the range of 1 to 6 hours. If the temperature is lower than the temperature, the reaction proceeds slowly, and if the temperature is higher than the temperature, side reactions are likely to occur.

  After obtaining the fumaric acid monoester chloride in this way, if necessary, excess thionyl chloride is distilled off under reduced pressure or the like and removed from the reaction system. Next, an alcohol having a silicon-containing alkyl group for reacting with the acid chloride is added for the purpose of introducing another substituent, a silicon-containing alkyl group.

を介して末端水酸基を有する化合物があげられる。これらは、目的とする酸素透過性や、原料コストなどを考慮して適宜選択すればよいが、３−トリス（トリメチルシロキシ）シリルプロパノールが特に好ましい。Specific examples of the alcohol having a silicon-containing alkyl group include 2-trimethylsilylethanol, 3-trimethylsilylpropanol, 3-pentamethyldisiloxanylpropanol, 3-heptamethyltrisiloxanylpropanol, 3-bis (trimethylsiloxy). ) Silylpropanol, 3-tris (trimethylsiloxy) silylpropanol, 4-tris (trimethylsiloxy) silylbutanol, 5-tris (trimethylsiloxy) silylpentanol, 3-tris (trimethylsiloxy) silylpropyl-3-phenol, 3 - other tris (trimethylsiloxy) silyl propyl-3 cyclohexanol, 3- tris (trimethylsiloxy) silyl propyl _{- (CH 2 CH 2 O)} o-CH 2 CH 2 CH 2 - group (O is an integer from 1 to 10) or

And a compound having a terminal hydroxyl group. These may be appropriately selected in consideration of the target oxygen permeability, raw material cost, etc., but 3-tris (trimethylsiloxy) silylpropanol is particularly preferable.

  When adding an alcohol having a silicon-containing alkyl group for reacting with the acid chloride, it is preferable to add a solvent or a tertiary amine as a catalyst in order to proceed the reaction uniformly. Examples of these solvents include tetrahydrofuran, benzene, toluene, hexane, acetone, ethyl acetate, diethyl ether, isopropyl ether, chloroform, methylene chloride, and the tertiary amine includes triethylamine. The amount of tertiary amine used is desirably in the range of a molar ratio of 1.0 to 2.0, more preferably in the range of 1.2 to 1.5, with respect to 1 mol of fumaric acid chloride.

  The mixing ratio of the acid chloride and the alcohol having a silicon-containing alkyl group is preferably in the range of 0.5 to 1.5 with respect to 1 mol of acid chloride. This is because when the amount is more than 1.5 or less than 0.5, there is a problem that the amount of the target compound produced is small. In addition, reaction temperature and reaction time are -10-20 degreeC and 1 to 6 hours, Preferably they are 0-5 degreeC and 1-2 hours.

  As for the isomerization method, in addition to using the thionyl chloride, as a cis-trans isomerization catalyst, halogen such as fluorine, chlorine, bromine and iodine, organic acid such as p-toluenesulfonic acid, acetyl chloride and benzenesulfonyl chloride , A method using a base such as piperidine, morpholine or diethylamine, a phosphorus compound such as triethyl phosphate or triphenyl phosphine, thiourea, etc. (see JP-A-58-18335), tetramethylammonium bromide, tetraethylammonium bromide There are a method using quaternary ammonium such as JP-A-60-181047 and a method using ruthenium, rhodium, palladium, iridium, platinum, etc. as an isomerization catalyst (see WO01 / 060780). Furthermore, a method by transesterification using an alkali metal such as lithium or sodium or an organometallic compound such as dibutyltin oxide or dibutyltin diacetate as a catalyst (see JP-A-9-255622) can also be exemplified. Which method should be adopted may be selected in consideration of the yield and production cost of the desired fumaric acid diester, but the method using thionyl chloride is more soluble in fumaric acid chloride in the solvent. It is convenient in synthesizing the asymmetric type fumaric acid diester of the present invention because it is expensive and the subsequent esterification reaction or amidation reaction can be carried out in a homogeneous system.

  The fumaric acid diester obtained by the above process can be used as an ophthalmic lens material such as a contact lens or an intraocular lens by combining with another copolymerizable monomer. Hereinafter, a contact lens material will be described as an example, but it can basically be used as an intraocular lens.

  As the contact lens, an application as an oxygen-permeable hard contact lens, an application as a hydrous soft contact lens, and the like can be considered, and other monomers and composition ratios to be combined are changed according to each application. In any application, it is preferable to use polyfunctional (meth) acrylate as a crosslinking component in addition to the fumaric acid diester of the present invention. This is for preventing mechanical strength as a lens and elution of unreacted monomers. Specific examples include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, allyl (meth) acrylate, diallyl phthalate, trimethylolpropane trimethacrylate, and divinylbenzene. It is preferable to use one or more selected from these. The amount used is preferably in the range of 0.01 to 10 parts by weight with respect to 100 parts by weight of the total monomer mixture.

  When used as a hard contact lens, in addition to the fumaric acid diester of the present invention, monomer components copolymerizable therewith include trifluoroethyl (meth) acrylate, tetrafluoroethyl (meth) acrylate, and pentafluoropropyl (meth). Fluorine-substituted alkyl (meth) acrylates such as acrylate, hexafluoropropyl (meth) acrylate, hexafluorobutyl (meth) acrylate and the like can be mentioned, and it is preferable to use one or more selected from these. These fluorine-based monomers are conventionally known as effective components for preventing adhesion of dirt to contact lenses. This amount is generally added in a proportion of 0 to 50% by weight in the total monomer.

  In order to improve the hardness and mechanical strength of contact lenses, methacrylate monomers such as methyl methacrylate, ethyl methacrylate, and t-butyl methacrylate, and aromatic vinyl monomers such as styrene, t-butyl styrene, and α-methyl styrene are used. It is preferable to use one or more selected from these. These monomers are generally added in a proportion of 0 to 30% by weight in the total monomers.

  Furthermore, conventionally known organosiloxane monomers that do not decrease oxygen permeability even when used in combination with fumaric acid diesters can also be used. Specifically, trimethylsilylmethyl (meth) acrylate, pentamethyldisiloxanylmethyl (meth) acrylate, tris (trimethylsiloxy) silylethyl (meth) acrylate, tris (trimethylsiloxy) silylpropyl (meth) acrylate, methylbis (trimethyl) There are siloxy) silylethyl (meth) acrylate, tris (pentamethyldisiloxanyloxy) silylpropyl (meth) acrylate, etc., and it is preferable to use one or more selected from these. These are added in a proportion of 0 to 50% by weight in the total monomers.

  Furthermore, in order to improve the tear wettability of the lens surface or to obtain a hydrous contact lens, other hydrophilic monomers can be used. Specifically, (meth) acrylic acid, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, glycerol (meth) acrylate, (meth) acrylamide, N, N-dimethylacrylamide, N, N -Dimethylaminoethyl acrylate, N, N-dimethylaminopropylacrylamide, N-vinylpyrrolidone and the like, and one or more of these are preferably selected and used. Monomers having a silicon-containing alkyl as a substituent generally have poor compatibility with hydrophilic monomers and are difficult to freely combine, but the fumaric acid diester of the present invention has a silicon-containing alkyl as one substituent. On the other hand, since the other substituent has a hydrophilic group, even if mixed with a hydrophilic monomer, compatibility does not become a problem, and it can be blended at a composition ratio with a higher degree of freedom than before. .

  Here, when used as a hard contact lens, the use amount of the hydrophilic monomer is suppressed to 5 to 30% by weight in all monomers, and when used as a hydrous soft contact lens, 30 to 70% by weight. It is preferable to set the range. In addition, even when used as a hydrous soft contact lens, the same monomers as those that can be used in the hard contact lens described above can be used in combination. When the proportion of the monomer is relatively high and a hard contact lens is intended, the proportion of components other than the hydrophilic monomer is relatively high.

  In short, for the purpose of obtaining a hard contact lens, the fumaric acid diester of the present invention is contained in the range of 10 to 80 wt%, preferably 15 to 70 wt%, the hydrophilic monomer is 5 to 30 wt%, and the other monomers are 10 wt%. On the other hand, for the purpose of obtaining a hydrous soft contact lens, the fumaric acid diester of the present invention is contained in the range of 5 to 80% by weight, preferably 10 to 70% by weight. 30 to 70% by weight and other monomers are 10 to 50% by weight.

  Then, for the monomer mixture formulated as described above, radical polymerization initiators such as azobisisobutyronitrile, azobisdimethylvaleronitrile, benzoyl peroxide as a polymerization initiator, benzoin methyl ether, benzoin ethyl ether, One or more photopolymerization initiators such as benzoin isobutyl ether, p-isopropyl-α-hydroxyisobutylphenone, N, N-tetraethyl-4,4-diaminobenzophenone, and benzophenone are selected, and 100 parts by weight of the total monomer mixture About 0.001 to 5 parts by weight, preferably 0.01 to 2 parts by weight.

  The monomer mixture thus prepared is molded as a polymer after being accommodated in a suitable container for polymerization or a mold having a contact lens shape. Since there are a wide variety of standards required for hard contact lenses, in general, they are often finished as desired contact lenses by cutting and polishing after being polymerized into a rod shape or block shape. On the other hand, in the case of a soft contact lens, since there are one to several basic base curves, there are few standards, and polymerization is often performed by a molding method. The lens molded product thus obtained can be made into a target product through surface treatment, hydration treatment, and the like as necessary.

  The contact lens of the present invention may further contain a conventionally known colorant or ultraviolet absorber depending on the purpose.

  In order to clarify the present invention more specifically, several examples according to the present invention are illustrated below.

-Synthesis of Compound 1 (2-methoxyethyl-3-tris (trimethylsiloxy) silylpropyl fumarate)-
The fumaric acid diester (compound 1) of the present invention can be obtained by the reaction formula shown below.

上記合成についてはまず、無水マレイン酸５．０ｇ（５１ｍｍｏｌ）と２−メトキシエタノール３．９ｇ（５１ｍｍｏｌ）を混合し、テトラヒドロフラン（以下ＴＨＦと略す）３０ｍｌを加えて溶解した。そしてトリエチルアミン（以下Ｅｔ_３Ｎと略す）を７３ｍｇ（０．７２ｍｍｏｌ）添加して、７０℃で２時間反応させた。反応溶液にエーテル／ＴＨＦ混合溶媒を添加して抽出し硫酸マグネシウムで乾燥後、溶媒を留去した。

For the above synthesis, first, 5.0 g (51 mmol) of maleic anhydride and 3.9 g (51 mmol) of 2-methoxyethanol were mixed and dissolved by adding 30 ml of tetrahydrofuran (hereinafter abbreviated as THF). Then, 73 mg (0.72 mmol) of triethylamine (hereinafter abbreviated as Et ₃ N) was added and reacted at 70 ° C. for 2 hours. The reaction solution was extracted by adding an ether / THF mixed solvent, dried over magnesium sulfate, and then the solvent was distilled off.

After 6.5 g (37 mmol) of 2-methoxyethyl maleate thus obtained was added 10 ml of thionyl chloride (hereinafter abbreviated as SOCl ₂ ) and heated under reflux for 1 hour in a nitrogen atmosphere, excess SOCl ₂ was reduced in pressure over 1 hour. Distilled off. 120 ml of THF and 7.9 g (22 mmol) of 3-tris (trimethylsiloxy) silylpropyl alcohol were added and dissolved. While cooling in an ice bath, 250 mg (2.2 mmol) of 4-dimethylaminopyridine was added, followed by Et ₃ N. 7.5 g (74 mmol) was added and reacted for 1 hour. Next, 1N hydrochloric acid was added for neutralization, extraction with 100 ml of ether, and drying with magnesium sulfate. After evaporation of the solvent, the target compound 1 was obtained by distillation under reduced pressure. Yield 62%

^１Ｈ ＮＭＲ（ＣＤＣｌ_３），δ，ｐｐｍ ａ）６．８９（ｓ，２Ｈ） ｂ）４．３７−４．３３（ｍ，２Ｈ） ｃ）４．１４（ｔ，Ｊ＝６．９ Ｈｚ，２Ｈ） ｄ）３．６６−３．６３（ｍ，２Ｈ） ｅ）３．４０（ｓ， ３Ｈ） ｆ）１．７５−１．５６（ｍ，２Ｈ） ｇ）０．５１−０．４４（ｍ，２Ｈ） ｈ）０．１０（ｓ，２７Ｈ） ¹ H- nuclear magnetic resonance spectrum and ¹³ C- nuclear magnetic resonance spectrum of compound 1 using a JEOL JNMα-400 model, in deuterated chloroform, 25 ° ^C., 1 H- nuclear magnetic resonance spectrum 8 cumulative The ¹³ C-nuclear magnetic resonance spectrum was measured with 128 integrations.
The results are as follows.

¹ H NMR (CDCl ₃ ), δ, ppm a) 6.89 (s, 2H) b) 4.37-4.33 (m, 2H) c) 4.14 (t, J = 6.9 Hz, 2H) d) 3.66-3.63 (m, 2H) e) 3.40 (s, 3H) f) 1.75-1.56 (m, 2H) g) 0.51-0.44 ( m, 2H) h) 0.10 (s, 27H)

^１３Ｃ ＮＭＲ（ＣＤＣｌ_３），δ，ｐｐｍ ａ）１６５．０，１６４．９ ｂ）１３４．２，１３３．０ ｃ）７０．２ ｄ）６７．５ ｅ）６４．３ ｆ）５９．０ ｇ）２２．６ ｈ）１０．３ ｉ）１．７
ＩＲ（ＮａＣｌ）．ｃｍ^−１ ２９６０（ｖ_Ｃ−Ｈ）．１７２７（ｖ_Ｃ＝Ｏ），１６４５（ｖ_Ｃ＝Ｃ），１２５５（ｖ_Ｓｉ−Ｃ），１２９７，１１５６（ｖ_{Ｃ（＝Ｏ）−Ｏ}），１０６０（ｖ_{Ｏ−Ｓｉ−Ｏ}）

¹³ C NMR (CDCl ₃ ), δ, ppm a) 165.0, 164.9 b) 134.2, 133.0 c) 70.2 d) 67.5 e) 64.3 f) 59.0 g 22.6 h) 10.3 i) 1.7
IR (NaCl). cm _< ^-1 > 2960 (vC _-H ). 1727 (v _{C = O} ), 1645 (v _{C = C} ), 1255 (v _Si-C ), 1297, 1156 (v _{C (= O) -O} ), 1060 (v _O-Si-O )

-Polymerization of hydrous contact lens material using Compound 1 (Examples 1 and 2 and Comparative Examples 1 and 2)-
As a crosslinking agent for 50 parts by weight of Compound 1, 33 parts by weight of N-vinylpyrrolidone (hereinafter referred to as NVP) and 17 parts by weight of 2-hydroxyethyl methacrylate (hereinafter referred to as 2-HEMA). After adding 0.3 parts of ethylene glycol di (meth) acrylate and 0.3 part of 2,2′-azobisisobutyronitrile as a polymerization initiator and dissolving, two glass plates (76 mm × 25 mm × 2 mm) ) Was injected into a jig sandwiched between a nylon sheet and a silicone spacer 0.2 mm thick hollowed to φ16.
Next, the jig is stopped with a clip so as not to leak, and the temperature is raised from room temperature to 60 ° C. in 1 hour in a programmed temperature rising oven, kept at the same temperature for 2 hours, and then to 75 ° C. in 1 hour. The temperature was raised and held at that temperature for 2 hours. Further, the temperature was raised to 90 ° C. over 1 hour, heated at the same temperature for 2 hours, and then gradually cooled to room temperature to obtain a film-like polymer having a thickness of 0.2 mm. The resulting film was transparent and hard. This film was hydrated in physiological saline, and each physical property was measured according to the following method. The results are shown in Table 1.

(I) Moisture content (wt%)
The moisture content of the film at 35 ° C. was determined based on the following formula.
Water content (% by weight) = {(W−W ₀ ) / W} × 100
However, W represents the weight (g) of the test film in an equilibrium water-containing state after hydration treatment, and W ₀ represents the weight (g) of the film in a state dried after drying in a dryer.

(B) Oxygen transmission coefficient (Dk _0.2 )
As an evaluation of oxygen permeability, an oxygen permeability coefficient value of 10 was obtained when the film thickness was about 0.2 mm in 35 ° C. physiological saline using an oxygen permeability meter manufactured by Tsukuba Rikaseiki Co., Ltd. It is shown as a numerical value multiplied by ¹¹ . Unit: (cm ² / sec) · (mlO ₂ / ml · mmHg)

(C) Transmittance (%)
As the evaluation of transparency, it is expressed as transmittance (%) at a wavelength of 380 to 780 nm of a film in a water-containing state using a UV measuring instrument manufactured by SHIMADZU.

なお、表中のモノマー成分に関する略号は以下の通りである。
ＴＲＩＳ：トリス（トリメチルシロキシ）シリルプロピルメタクリレート
ＮＶＰ ：Ｎ−ビニルピロリドン
２−ＨＥＭＡ：２−ヒドロキシエチルメタクリレート

In addition, the symbol about the monomer component in a table | surface is as follows.
TRIS: Tris (trimethylsiloxy) silylpropyl methacrylate NVP: N-vinylpyrrolidone 2-HEMA: 2-hydroxyethyl methacrylate

  From the results shown in Table 1, when TRIS, which has been mainly used as a conventional silicon-based monomer, is used, there is a problem in that it lacks transparency when containing water depending on the combination with other monomer components. In the case of Compound 1, the effect of using a monomer having a hydrophilic group and a silicon-containing alkyl in one molecule is expressed on the structure of fumaric acid diester because of its excellent transparency. Understandable. In addition, about oxygen permeability, both show the high value depending on the quantity containing a silicon-type monomer.

-Examples 3-8 and Comparative Examples 3-7-
A film was obtained in the same manner as in Example 1 except that the composition of the polymerization components in Example 1 was changed as shown in Table 2 (Examples 3 to 8) and Table 3 (Comparative Examples 3 to 7). The physical properties of the obtained film were measured in the same manner as in Example 1, and the results shown in Table 2 and Table 3 below were obtained.

なお、表中のモノマー成分に関する略号は以下の通りである。
６ＦＰ ：ヘキサフルオロプロピル（メタ）アクリレート
ＮＶＰ ：Ｎ−ビニルピロリドン
ＤＭＡＡ：Ｎ，Ｎ−ジメチルアクリルアミド
２−ＨＥＭＡ：２−ヒドロキシエチルメタクリレート

In addition, the symbol about the monomer component in a table | surface is as follows.
6FP: Hexafluoropropyl (meth) acrylate NVP: N-vinylpyrrolidone DMAA: N, N-dimethylacrylamide 2-HEMA: 2-hydroxyethyl methacrylate

From the results of Tables 2 and 3, Dk _0.2 was 1.5 times or more that of the moisture content-dependent material (comparative example) in the examples of the present invention.

  Moreover, paying attention to the moisture content and the oxygen permeability coefficient, the relationship between Examples 1 to 8 and Comparative Examples 3 to 7 is shown in FIG. From the figure, it can be seen that the lens material of the present invention maintains high oxygen permeability regardless of the moisture content as compared with the conventional moisture content-dependent soft contact lens.

-Synthesis of Compound 2-
A fumaric acid diester (compound 2) can be obtained from the reaction formula shown below.

  3.6 g (20 mmol) of 2-methoxyethyl malate, 11.3 g (10 mmol) of polyorganosiloxane compound 1 having the following structure, and 245 mg (2.0 mmol) of 4-dimethylaminopyridine were dissolved in 40 ml of methylene chloride. 3.9 g (20 mmol) of 1-ethyl-3- (3-dimethylaminopropyl) carbodiimide hydrochloride (hereinafter abbreviated as EDC) was added, and the mixture was stirred at room temperature for 3 hours. The reaction system was washed with 1N hydrochloric acid, dried over anhydrous magnesium sulfate, the solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography (chloroform) to obtain the desired compound 2. Yield 95%.

ポリオルガノシロキサン化合物１（平均重合度ｎ＝１０）：

Polyorganosiloxane compound 1 (average polymerization degree n = 10):

^１Ｈ ＮＭＲ（ＣＤＣｌ_３），δ，ｐｐｍ ａ）６．９２（ｓ，２Ｈ） ｂ）４．３７−４．３２（ｍ，４Ｈ） ｃ）３．６８−３．６８（ｍ，４Ｈ） ｄ）３．４５−３．４１（ｍ，２Ｈ） ｅ）３．３９（ｓ，３Ｈ） ｆ）１．６４−１．５７（ｍ，４Ｈ） ｇ）１．３３−１．２５（ｍ，２Ｈ） ｈ）０．９０−０．８５（ｍ，３Ｈ） ｉ）０．５５−０．４９（ｍ，４Ｈ） ｊ）０．０７（ｓ，ｍａｎｙ）The ¹ H-nuclear magnetic resonance spectrum and ¹³ C-nuclear magnetic resonance spectrum of Compound 2 are JNMα-400 model manufactured by JEOL Ltd., 25 ° C. in deuterated chloroform, and ¹ H-nuclear magnetic resonance spectrum is accumulated 8 times. The ¹³ C-nuclear magnetic resonance spectrum was measured with 128 integrations.
The results are as follows.

¹ H NMR (CDCl ₃ ), δ, ppm a) 6.92 (s, 2H) b) 4.37-4.32 (m, 4H) c) 3.68-3.68 (m, 4H) d ) 3.45-3.41 (m, 2H) e) 3.39 (s, 3H) f) 1.64-1.57 (m, 4H) g) 1.33-1.25 (m, 2H) H) 0.90-0.85 (m, 3H) i) 0.55-0.49 (m, 4H) j) 0.07 (s, many)

^１３Ｃ ＮＭＲ（ＣＤＣｌ_３），δ，ｐｐｍ ａ）１６４．８ ｂ）１３３．７，１３３．５ ｃ）７４．１ ｄ）７０．２ ｅ）６８．２ ｆ）６４．５，６４．２ ｇ）５８．９ ｈ）２６．３ ｉ）２５．４ ｊ）２３．４；２３．３，２３．２ ｋ）１７．９ ｌ）１４．０ ｍ）１３．７ ｎ）１．９，１．８，１．６，１．５，１．１，１．０，０．５，０．４，０．３ ｏ）０．１
ＩＲ（ＮａＣｌ）ｃｍ^−１ ２９６２（ｖ_Ｃ−Ｈ），１７２９（ｖ_Ｃ＝Ｏ），１６４６（ｖ_Ｃ＝Ｃ），１２６０（ｖ_Ｓｉ−Ｃ），１２９６，１０９１（ｖ_{Ｃ（＝Ｏ）−Ｏ}），１０２５（ｖ_{Ｏ−Ｓｉ−Ｏ}）

¹³ C NMR (CDCl ₃ ), δ, ppm a) 164.8 b) 133.7, 133.5 c) 74.1 d) 70.2 e) 68.2 f) 64.5, 64.2 g ) 58.9 h) 26.3 i) 25.4 j) 23.4; 23.3, 23.2 k) 17.9 l) 14.0 m) 13.7 n) 1.9, 1. 8, 1.6, 1.5, 1.1, 1.0, 0.5, 0.4, 0.3 o) 0.1
IR (NaCl) cm ^-1 2962 (v _C-H ), 1729 (v _{C = O} ), 1646 (v _{C = C} ), 1260 (v _Si-C ), 1296, 1091 (v _{C (= O)- O} ), 1025 (vO _-Si-O )

-Synthesis of Compound 3-
A fumaric acid diester (compound 3) can be obtained from the reaction formula shown below.

上述合成についてはまず、無水マレイン酸１０ｇ（１０２ｍｍｏｌ）と１−（２−ヒドロキシエチエチル）−２−ピロリジノン１３ｇ（１０２ｍｍｏｌ）を混合し、ＴＨＦ２０ｍｌを加えて溶解させた。そして、Ｅｔ_３Ｎを０．５ｍｌ添加し室温で２時間反応させた。反応溶液から、目的物を析出物としてろ別し単離した。収率９６％。
得られた２−（２−オキソピロリジニル）エチルマレート１．０ｇ（４．４ｍｍｏｌ）、ポリオルガノシロキサン化合物１ ２．５ｇ（２．２ｍｍｏｌ）、４−ジメチルアミノピリジン５４ｍｇ（０．４４ｍｍｏｌ）を塩化メチレン５ｍｌに溶解させた。ＥＤＣ０．８４ｇ（４．４ｍｍｏｌ）を添加し、室温で８４時間撹拌した。１Ｎ塩酸で反応系を洗浄し、無水硫酸マグネシウムで乾燥し、溶媒を減圧留去した後、シリカゲルカラムクロマトグラフィー（塩化メチレン／酢酸エチル＝１０／１）にて精製を行い、目的とする化合物３を得た。収率４９％。

For the above synthesis, first, 10 g (102 mmol) of maleic anhydride and 13 g (102 mmol) of 1- (2-hydroxyethyl) -2-pyrrolidinone were mixed and dissolved by adding 20 ml of THF. Then, 0.5 ml of Et ₃ N was added and reacted at room temperature for 2 hours. From the reaction solution, the target product was filtered and isolated as a precipitate. Yield 96%.
The obtained 2- (2-oxopyrrolidinyl) ethyl malate 1.0 g (4.4 mmol), polyorganosiloxane compound 1 2.5 g (2.2 mmol), 4-dimethylaminopyridine 54 mg (0.44 mmol) were chlorinated. Dissolved in 5 ml of methylene. EDC 0.84g (4.4mmol) was added, and it stirred at room temperature for 84 hours. The reaction system was washed with 1N hydrochloric acid, dried over anhydrous magnesium sulfate, the solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography (methylene chloride / ethyl acetate = 10/1) to obtain the target compound 3 Got. Yield 49%.

^１Ｈ ＮＭＲ（ＣＤＣｌ_３），δ，ｐｐｍ ａ）６．９０（ｓ，２Ｈ） ｂ）４．３６−４．３２（ｍ，４Ｈ） ｃ）３．６８（ｔ，Ｊ＝４．７ Ｈｚ，２Ｈ） ｄ）３．６０（ｔ，Ｊ＝５．４ Ｈｚ，２Ｈ） ｅ）３．５０−３．４１（ｍ，４Ｈ） ｆ）２．３８（ｔ，Ｊ＝８．３ Ｈｚ，２Ｈ） ｇ）２．０７−２．０１（ｍ，２Ｈ） ｈ）１．６５−１．５８（ｍ，２Ｈ） ｉ）１．３３−１．２５（ｍ，４Ｈ） ｊ）０．８８（ｔ，Ｊ＝６．９ Ｈｚ，３Ｈ） ｋ）０．５５−０．４９（ｍ，４Ｈ） ｌ）０．０８−０．０５（ｍ，ｍａｎｙ） ¹ H- nuclear magnetic resonance spectrum and ¹³ C- nuclear magnetic resonance spectrum of Compound 3 using a JEOL JNMα-400 model, in deuterated chloroform, 25 ° ^C., 1 H- nuclear magnetic resonance spectrum 8 cumulative The ¹³ C-nuclear magnetic resonance spectrum was measured with 128 integrations.
The results are as follows.

¹ H NMR (CDCl ₃ ), δ, ppm a) 6.90 (s, 2H) b) 4.36-4.32 (m, 4H) c) 3.68 (t, J = 4.7 Hz, 2H) d) 3.60 (t, J = 5.4 Hz, 2H) e) 3.50-3.41 (m, 4H) f) 2.38 (t, J = 8.3 Hz, 2H) g) 2.07-2.01 (m, 2H) h) 1.65-1.58 (m, 2H) i) 1.33-1.25 (m, 4H) j) 0.88 (t, J = 6.9 Hz, 3H) k) 0.55-0.49 (m, 4H) l) 0.08-0.05 (m, many)

^１３Ｃ ＮＭＲ（ＣＤＣｌ_３），δ，ｐｐｍ ａ）１７５．３ ｂ）１６４．６，１６４．４ ｃ）１３３．９，１３３．６ ｄ）６８．２ ｅ）６４．５ ｆ）６２．７ ｇ）４７．９ ｈ）４１．５ ｉ）３０．５ ｊ）２６．２ ｋ）２５．３ ｌ）２３．３ ｍ）１８．０ ｎ）１７．８ ｏ）１４．０ ｐ）１３．７ ｑ）１．６，１．５，１．０，０．９，０．５，０．４ ｒ）０
ＩＲ（ＮａＣｌ）ｃｍ^−１ ２９６１，２８７２（ｖ_Ｃ−Ｈ），１７２６，１６９３（ｖ_Ｃ＝Ｏ），１２９４（ｖ_{Ｃ（＝Ｏ）−Ｏ}），１２５９（ｖ_Ｓｉ−Ｃ），１０１５（ｖ_{Ｏ−Ｓｉ−Ｏ}）

¹³ C NMR (CDCl ₃ ), δ, ppm a) 175.3 b) 164.6, 164.4 c) 133.9, 133.6 d) 68.2 e) 64.5 f) 62.7 g ) 47.9 h) 41.5 i) 30.5 j) 26.2 k) 25.3 l) 23.3 m) 18.0 n) 17.8 o) 14.0 p) 13.7 q 1.6, 1.5, 1.0, 0.9, 0.5, 0.4 r) 0
IR (NaCl) cm ^-1 296,2872 (v _C-H ), 1726, 1693 (v _{C = O} ), 1294 (v _{C (= O) -O} ), 1259 (v _Si-C ), 1015 (v _O-Si-O )

  Moreover, it replaced with the polyorganosiloxane compound 1 and obtained the following compound (4) by the method similar to the above except having used the polyorganosiloxane compound 2 of the following structures.

ポリオルガノシロキサン化合物２（平均重合度ｎ＝１０）：

Polyorganosiloxane compound 2 (average polymerization degree n = 10):

-Examples 9-24-
Using the compounds (2) to (4) obtained above, the compositions of the copolymer components were prepared as shown in Tables 4 to 7. And it polymerized on the following temperature conditions by the method similar to Example 1,2. The temperature was raised from room temperature to 90 ° C. in 30 minutes, kept at the same temperature for 1 hour, then heated to 110 ° C. in 30 minutes, heated at the same temperature for 1 hour, and then gradually cooled to room temperature. Thus, a film-like polymer having a thickness of 0.2 mm was obtained. The obtained film was hydrated in distilled water, and each physical property was examined. The results are shown in Tables 4-6.

The abbreviations in Tables 4 to 6 represent the following compounds, respectively.
TRIS: Tris (trimethylsiloxy) silylpropyl methacrylate FM7711: Both ends Silaplane (trademark) manufactured by Chisso Corporation Average molecular weight 1000 3FE: Trifluoroethyl (meth) acrylate NVP: N-vinylpyrrolidone DMAA: N, N-dimethylacrylamide

-Comparative examples 8 to 10-
A film-like polymer having a thickness of 0.2 mm was obtained in the same manner as in Examples 9 to 24 except that the composition of the copolymerization component was changed as shown in Table 7. The obtained film was hydrated in distilled water, and each physical property was examined. The results are shown in Table 7.

From the results of Tables 4 to 6, it can be seen that the film obtained according to the present invention exhibits excellent transparency in a water-containing state. Further, as in Comparative Examples 9 and 10 in Table 7, the oxygen permeability was higher than that in the case of using a conventionally used polydimethylsiloxane methacrylate. The oxygen permeability Dk _0.2 of the present invention example was 1.5 to 2.5 times that of the moisture content-dependent material (Comparative Examples 3 to 7).

  Furthermore, when TRIS and polydimethylsiloxane methacrylate, which have been mainly used as conventional silicon-based monomers, are used, the water content tends to decrease significantly depending on the amount used (Comparative Examples 8 to 10). In the structure of the fumaric acid diester of the present invention, a monomer having a hydrophilic group and a silicon-containing alkyl in one molecule is used because the use of Compound 2 and Compound 3 slightly increases depending on the amount of the compound. It can be seen that the effect of. In addition, although the moisture content decreased slightly according to the usage-amount about the compound 4, when Example 24 was compared with the comparative example 10, use of the compound 4 was maintaining especially high oxygen permeability and moisture content. I understand.

It is the figure which showed the relationship between the water content and oxygen permeability coefficient about 1-8 of this invention example and Comparative Examples 3-7.

Claims (4)

A fumaric acid derivative having a hydrophilic group (R) represented by the general formula (1) and a silicon-containing alkyl group.

[Wherein Y ₁ is O or NR ₁ (R ₁ is a group selected from the group consisting of hydrogen, an alkyl group having 1 to 3 carbon atoms, and an aryl group);
R is a hydroxyalkyl group having 1 to 10 carbon _{atoms, - (CH 2 CH 2 O} ) m-A group (m is an integer of from 1 to 10, A is a hydrogen, methyl or ethyl), the following formula:

A group selected from:
Y ₂ is linear or branched alkylene having 3 to 10 carbon atoms, phenylene, cyclohexylene, — (CH ₂ CH ₂ O) o —CH ₂ CH ₂ CH ₂ — group (where o is an integer of 1 to 10), formula:

A group represented by:
X ₁ , X ₂ and X ₃ each independently represent a methyl group, a trimethylsiloxy group, or an organosiloxy group having 18 or less Si atoms]   An ophthalmic lens obtained by polymerizing a composition comprising the fumaric acid derivative according to claim 1.   The ophthalmic lens according to claim 2, comprising a copolymer obtained by polymerizing 10 to 80% by weight of the fumaric acid derivative according to claim 1 and 90 to 20% by weight of another copolymer component.   The other copolymerization component is a fumaric acid diester other than the fumaric acid derivative according to claim 1, fumaric acid diamide, fumaric acid amide ester, N vinyl lactam, N, N-dialkyl (meth) acrylamide, hydroxylethyl <meta The ophthalmic lens according to claim 3, wherein the ophthalmic lens is one or more polymerization components selected from acrylic esters.

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