JP2016204535A - Monomer for manufacturing ophthalmic device, polymer thereof, and ophthalmic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compound that is a polymerizable monomer having a prescribed number of silicon atoms, has a high purity, is suitable as an ophthalmic monomer, has good compatibility with a (meth)acrylic monomer used in combination, is a monomer compound excellent in hydrolysis resistance and gives a polymer excellent in antifouling property and durability of mechanical strength and to provide a method for producing the compound.SOLUTION: The compound represented by formula (1) as given below and the method for producing the compound are provided. (In formula (1), k is 2 or 3; n is an integer of 1 to 2; Rand Rare each independently a 1-4C alkyl group; and Ris a hydrogen atom or a methyl group)SELECTED DRAWING: None

Description

  The present invention relates to a compound for producing an ophthalmic device, for example, a contact lens, an intraocular lens, and an artificial cornea (hereinafter also referred to as “ophthalmic monomer”) and a method for producing the compound. Specifically, it is copolymerized with other polymerizable monomers such as (meth) acrylic monomers, has high transparency and oxygen permeability, excellent hydrophilicity, antifouling properties, mechanical strength durability, and resistance. The present invention relates to a compound giving a polymer excellent in hydrolyzability and suitable for application to the eye, and a method for producing the same.

The following silicone compounds are known as ophthalmic monomers.

  The above TRIS (3- [tris (trimethylsiloxy) silyl] propyl methacrylate) has poor compatibility with hydrophilic monomers such as 2-hydroxyethyl methacrylate (HEMA), and when copolymerized with these hydrophilic monomers, There is a disadvantage that a transparent polymer cannot be obtained. On the other hand, the SiGMA is excellent in compatibility with a hydrophilic monomer such as HEMA, and the copolymer is characterized by relatively high oxygen permeability and high hydrophilicity. However, in recent years, ophthalmic polymers have been required to have higher oxygen permeability so that they can be worn continuously for a long time, and polymers obtained from SiGMA have insufficient oxygen permeability.

ＳｉＧＭＡにおいてビス（トリメチルシロキシ）メチルシリル部分をＳｉ部分とし、全体に占めるＳｉ部分の質量割合を求めると５２％となる。一方、上記式（ａ）において、トリス（トリメチルシロキシ）シリル部分をＳｉ部分とし、全体に占めるＳｉ部分の質量割合を求めると６０％となる。即ち、上記式（ａ）の化合物は、Ｓｉ部分の質量割合が多い。その為、得られる眼科デバイスに高い酸素透過性をもたらすことができる。 In order to solve this problem, Patent Document 1 describes a compound represented by the following formula (a).

In SiGMA, the bis (trimethylsiloxy) methylsilyl moiety is defined as the Si moiety, and the mass ratio of the Si moiety in the whole is 52%. On the other hand, in the above formula (a), the tris (trimethylsiloxy) silyl moiety is the Si moiety, and the mass ratio of the Si moiety in the whole is 60%. That is, the compound of the formula (a) has a large mass ratio of the Si portion. Therefore, high oxygen permeability can be brought to the obtained ophthalmic device.

  However, when the mass ratio of the Si portion is increased in order to increase the oxygen permeability, there is a problem that the strength of the copolymer polymer is lowered because the molecular weight per polymerizable group is increased. In addition, Patent Document 2 describes that the compound represented by the above formula (a) is prepared by reacting an epoxy precursor with methacrylic acid, but this reaction has many side reactions and is obtained. There was also a problem that the fluctuation of the physical properties of the polymer was large.

しかし上記化合物をモノマー成分として得られる重合体は、機械強度が不足することや、重合反応性に劣ることがあった。また、得られる重合体は耐汚染性が十分ではない。 Patent Document 3 describes an ophthalmic lens using a compound having two repeating units of an ethylene oxide structure represented by the following formula (e) and a polymer containing the compound as a polymerization component.

However, the polymer obtained using the above compound as a monomer component may have insufficient mechanical strength or inferior in polymerization reactivity. Further, the resulting polymer is not sufficiently resistant to contamination.

  From the viewpoint of oxygen permeability, tetramer silicone or more is preferable, and tetramer silicone and pentamer silicone are considered preferable in order to achieve both oxygen permeability and the strength of the copolymer. Therefore, development of a method for obtaining a silicone monomer having a tetramer or higher silicone with high purity is required.

該方法で得られた生成物は、２−ヒドロキシエチルメタクリレート等の親水性モノマーと混合した時に白濁する場合がある。さらに、クロロシランによる該シリコーン鎖の末端封鎖率が高くない。 In Patent Document 4, chlorosilane having a (meth) acryl group such as 3- (2-methacryloyloxyethoxy) propyldimethylchlorosilane is reacted with anion-polymerized cyclic siloxane using lithium trialkylsilanolate as an initiator. A method for preparing a silicone compound represented by the following formula (b) is described.

The product obtained by this method may become cloudy when mixed with a hydrophilic monomer such as 2-hydroxyethyl methacrylate. Furthermore, the terminal blocking rate of the silicone chain by chlorosilane is not high.

（ｒは３以上の整数）
しかし、上記方法ではエステル化率が不十分となり末端封鎖率が低く、また、シリコーンの重合度に分布ができる。 Patent Document 5 describes a method of preparing a silicone compound represented by the following formula (c) by esterification or transesterification of one-terminal hydroxyl group-containing organopolysiloxane and (meth) acrylic acid (ester).

(R is an integer of 3 or more)
However, in the above method, the esterification rate becomes insufficient, the terminal blocking rate is low, and the degree of polymerization of silicone can be distributed.

（ここでｍは３〜１０の整数のうちの一つ、ｎは１または２のうちの一つ、Ｒ^１は炭素数１〜４のアルキル基のうちの一つ、Ｒ^２は水素及びメチル基のうちの一つである） Patent Document 6 describes a method for preparing a silicone compound represented by the following formula (d) by esterification of a one-terminal hydroxyl group-containing organopolysiloxane and a (meth) acrylic acid halide. Patent Document 6 is capable of producing a high-purity silicone monomer containing more than 95% by weight of one kind of silicone compound represented by the following formula (d) and having specific m, n, R ¹ and R ² by the method. Is described.

(Where m is one of integers from 3 to 10, n is one of 1 or 2, R ¹ is one of alkyl groups having 1 to 4 carbon atoms, R ² is hydrogen and methyl. One of the groups)

JP 2007-186709 A Japanese Patent Laid-Open No. 2007-1918 Japanese Patent No. 4882136 JP 59-78236 A JP 2001-55446 A Japanese Patent No. 4646152

  The polymers obtained from the monomer compounds described in Patent Documents 3 and 6 are inferior in durability of mechanical strength, and the mechanical strength may decrease when immersed in a phosphate buffer solution. In any of the compounds described in Patent Documents 1 to 6, the alkylene adjacent to the siloxanyl group is propylene or methylpropylene. This is because allyl alcohol and methallyl alcohol as starting materials are stable and easy to handle and obtain, and allyl ether compounds and methallyl ether compounds of these derivatives are widely used as raw materials. However, the polymer obtained by using these compounds as a polymerization component described in Patent Documents 1 to 6 may change the physical properties of the ophthalmic device due to hydrolysis.

  Therefore, the present invention is a polymerizable monomer having a predetermined number of silicon atoms, is highly pure and suitable as an ophthalmic monomer, has good compatibility with the (meth) acrylic monomer used in combination, and is resistant to resistance. It is an object of the present invention to provide a compound that is a monomer compound excellent in hydrolyzability, gives a polymer excellent in antifouling property and durability of mechanical strength, and a method for producing the same.

  As a result of intensive studies to solve the above problems, the present inventors have found that the compound represented by the following formula (1) has good compatibility with other (meth) acrylic monomers and is resistant to hydrolysis. The present invention has been found by providing a polymer which is excellent in properties, is colorless and transparent, and has excellent mechanical strength durability and antifouling properties.

(式（１）において、ｋは２または３であり、ｎは１〜２の整数であり、Ｒ¹およびＲ^２は互いに独立に炭素数１〜４のアルキル基であり、Ｒ^３は水素原子又はメチル基である) That is, this invention provides the compound represented by following formula (1), and the manufacturing method of this compound.

(In the formula (1), k is 2 or 3, n is an integer of ^{1 to 2} , R ¹ and R ² are each independently an alkyl group having 1 to 4 carbon atoms, and R ³ is a hydrogen atom. Or a methyl group)

  The silicone compound of the present invention provides a polymer having excellent hydrolysis resistance and excellent mechanical strength durability. In addition, since it has high oxygen permeability and high compatibility with other (meth) acrylic monomers used in combination, it gives a colorless and transparent polymer. Furthermore, since the compatibility with the fluorine-substituted group-containing (meth) acrylic monomer that imparts stain resistance is also good, a polymer with improved stain resistance (antifouling property) can be provided. The production method of the present invention uses a reaction between a silicone compound having a hydroxyl group and an acid chloride, or an addition reaction between a silicone compound having a hydrosilyl group and an unsaturated (meth) acrylic compound having an ethylene oxide structure. According to the production method, a silicone compound having high purity can be provided. Therefore, the silicone compound and the method for producing the compound of the present invention are suitable for producing an ophthalmic device.

  The silicone compound of the present invention is represented by the above formula (1), has a siloxanyl group containing a predetermined number of silicon atoms and a (meth) acryl group, and has an ethylene oxide structure as a spacer between the (meth) acryl group and the siloxanyl group. It is characterized by having only. In particular, the alkylene adjacent to the siloxanyl group is ethylene. Thereby, hydrolysis resistance can be improved. When the alkylene adjacent to the siloxanyl group has 3 or more carbon atoms, for example, propylene or methylpropylene, the compound is easily hydrolyzed and the physical properties of the resulting polymer may be changed.

  In the above formula (1), k is 2 or 3. When k is 0 or 1, the oxygen permeability is low.

  In said formula (1), n is an integer of 1-2. The compound of the present invention can have good hydrophilicity by having a (poly) ethylene oxide structure. When n is 0, the hydrophilicity is lowered. When n exceeds the upper limit, hydrolysis resistance is lowered.

In the above formula (1), R ¹ and R ² are each independently an alkyl group having 1 to 4 carbon atoms. Examples thereof include a methyl group, an ethyl group, a propyl group, and a butyl group, and a methyl group is preferable.

In the above formula (1), R ³ is a hydrogen atom or a methyl group.

The present invention provides a compound represented by the above formula (1) and having one kind of compound having specific one of k, n, R ¹ , R ² and R ³ with high purity by the method described later. Can do. High purity means that one type having the one specific structure constitutes more than 95% by mass, preferably 97% by mass or more, more preferably 99% by mass or more, based on the total mass of the compound. In the present invention, the purity is determined by gas chromatography (hereinafter referred to as “GC”) analysis. Detailed conditions will be described later. When the compound has the high purity, a transparent polymer can be obtained without causing turbidity when mixed with a non-silicone monomer such as 2-hydroxyethyl methacrylate. When a compound having a purity of less than 95% by mass, for example, more than 5% by mass, is present, turbidity may occur when the compound of the present invention is mixed with a non-silicone monomer, and a transparent polymer may not be obtained. .

In the formula (1), when k is 2, n is 2, R ¹ and R ² are methyl groups, and R ³ is a hydrogen atom, the molecular weight of the compound is 408, and relative to the total mass of the compound The mass proportion of siloxane is about 54%. Since the compound has a high Si content, the resulting copolymer has high oxygen permeability.

（式（２）において、ｋ、ｎ、Ｒ^１およびＲ^２は上述のとおりである）
下記式（３）で表される(メタ)アクリル酸ハライドとを

(式（３）において、ＸはＣｌ、Ｂｒ、又はＩであり、Ｒ^３は上述のとおりである)
反応させる工程を含む。
該反応は、上記式（２）で表されるポリオルガノシロキサンの、トルエンまたはヘキサン等の溶液中に、上記式（３）で表される酸ハライド、好ましくは酸クロライドを、徐々に添加して、水浴等で冷却しながら０〜５０℃の温度で行なうことが好ましい。 The present invention further provides a method for producing the compound represented by the above formula (1).
The first production method of the present invention comprises a silicone compound represented by the following formula (2):

(In the formula (2), k, n, R ¹ and R ² are as described above.)
(Meth) acrylic acid halide represented by the following formula (3)

(In Formula (3), X is Cl, Br, or I, and R ³ is as described above.)
A step of reacting.
The reaction is carried out by gradually adding an acid halide represented by the above formula (3), preferably an acid chloride, into a solution of the polyorganosiloxane represented by the above formula (2) such as toluene or hexane. It is preferable to carry out at 0-50 degreeC, cooling with a water bath etc.

  The amount ratio of the acid halide represented by the formula (3) is 1 to 3 mol, preferably 1.05 to 2 mol with respect to 1 mol of the polyorganosiloxane represented by the formula (2). If it is less than the said lower limit, the polyorganosiloxane of Formula (2) will remain as an unreacted substance, and high purity cannot be achieved. Moreover, it is economically disadvantageous if the upper limit is exceeded.

  The above reaction is preferably carried out in the presence of an acid scavenger. When the reaction is carried out in the presence of an acid scavenger, the yield becomes higher. Examples of the acid scavenger include various amines such as triethylamine and pyridine, and triethylamine is preferable. The amount ratio of the acid scavenger may be about 1 to 2 mol with respect to 1 mol of (meth) acrylic acid halide represented by the above formula (3).

  The purity of (meth) acrylic acid halide affects the purity of the resulting silicone compound (formula (1)). Therefore, the (meth) acrylic acid halide is preferably a high purity product. It is particularly preferable to use commercially available (meth) acrylic acid chloride having a purity of 99% or more. In the reaction using acid chloride, side reactions are hardly observed.

  In a preferred embodiment of the method of the present invention, during the reaction, the presence or absence of the residual silicone compound (formula (2)) is monitored by GC measurement, and after confirming the disappearance of the peak, water is added to the reaction and stirred. Then, it is allowed to stand to separate into an organic layer and an aqueous layer. After the organic layer is washed several times with water, the solvent in the organic layer is stripped. By this method, an object having a purity exceeding 95% by mass in GC measurement can be obtained. Purity is based on the percentage of GC peak area. When a flame ionization detector (FID) is used, the peak area is proportional to the number of carbon atoms, so the ratio is approximately equal to the mass% in the product.

（ｋ、Ｒ^１及びＲ^２は上述のとおりである）
下記式（５）で表される化合物（以下、ビニルエーテル化合物という）とを、

（ｎは上述のとおりである）
付加反応させて製造することができる。 The silicone compound represented by the above formula (2) is an organohydrogensiloxane represented by the following formula (4):

(K, R ¹ and R ² are as described above)
A compound represented by the following formula (5) (hereinafter referred to as a vinyl ether compound),

(N is as described above)
It can be produced by addition reaction.

  The addition reaction may be performed according to a conventionally known method. For example, the reaction is performed in the presence of an addition reaction catalyst such as a platinum group compound. At that time, a solvent may be used. For example, aliphatic or aromatic solvents such as hexane, methylcyclohexane, ethylcyclohexane and toluene, and alcohol solvents such as ethanol and IPA can be preferably used. The blending ratio may be according to a conventionally known method, and the vinyl ether compound is used in an amount of 1.2 mol or more, preferably 1.5 mol or more, per 1 mol of polyorganohydrogensiloxane. The upper limit is not particularly limited, but is usually 5 mol or less, particularly 3 mol or less.

As a vinyl ether compound represented by the said Formula (5), Preferably, the compound represented by a following formula is mentioned.

  In a preferred embodiment, for example, a vinyl ether compound is diluted with a solvent as necessary, and a platinum-based hydrosilylation catalyst is added thereto. The kind in particular of platinum-type hydrosilylation catalyst is not restrict | limited, A conventionally well-known thing can be used. Furthermore, polyorganohydrogensiloxane is dropped and reacted at room temperature or higher. After completion of the dropwise addition, after aging under heating, the presence or absence of the starting polyorganohydrogensiloxane is confirmed by the disappearance of the peak in, for example, GC measurement. By confirming the reaction end point by GC measurement, since the polyorganohydrogensiloxane does not remain in the product, a high-purity silicone compound can be obtained. The above reaction may be carried out in a lump.

After completion of the addition reaction, excess vinyl ether compound is removed from the reaction solution. Examples of the method include stripping under reduced pressure, or a method in which the reaction product is washed with ion-exchanged water or sodium nitrate water and the vinyl ether compound is extracted and removed into an aqueous layer. At this time, it is preferable to use an appropriate amount of a solvent such as toluene or hexane in order to obtain good two-layer separation. In particular, by removing the solvent from the organic layer under reduced pressure, the silicone compound of the above formula (2) can be obtained with a high purity of more than 95% by mass, more preferably about 97% by mass or more, and further 99% by mass or more. it can. In order to increase the purity, distillation may be performed a plurality of times. High purity means that one type having a specific structure having a specific one of k, n, R ¹ , R ² and R ³ in formula (2) is more than 95% by mass of the total mass of the compound, Preferably it is 97 mass% or more, More preferably, it is 99 mass% or more.

  The organohydrogensiloxane represented by the above formula (4) can be produced by a known method, or a commercially available product can be used.

  In addition, the hydroxyl group in the vinyl ether compound may be converted to a silyl ester with a silylating agent such as hexamethyldisilazane, and the silyl ester may be hydrolyzed after the addition reaction to obtain a silicone compound of the formula (2).

（ｋ、Ｒ^１及びＲ^２は上述のとおりである）
下記式（６）で表される化合物とを、

（ｎ及びＲ^２は上述のとおりである）
反応させる工程を含む。 The second method of the present invention for producing the compound represented by the above formula (1) includes an organohydrogensiloxane represented by the following formula (4),

(K, R ¹ and R ² are as described above)
A compound represented by the following formula (6):

(N and R ² are as described above)
A step of reacting.

  The addition reaction may be performed according to a conventionally known method. For example, the reaction is performed in the presence of an addition reaction catalyst such as a platinum group compound. At that time, a solvent may be used. For example, aliphatic or aromatic solvents such as hexane, methylcyclohexane, ethylcyclohexane and toluene, and alcohol solvents such as ethanol and IPA can be preferably used. The compound represented by the formula (6) is used in an amount of 1.2 mol or more, preferably 1.5 mol or more per 1 mol of the polyorganohydrogensiloxane. The upper limit is not particularly limited, but is usually 5 mol or less, particularly 3 mol or less. The compound represented by the above formula (6) can be produced by a known method such as a reaction between vinyl alcohol and acid halide.

As a compound represented by the said Formula (6), Preferably, the compound represented by a following formula is mentioned.

  In a preferred embodiment, for example, the compound represented by the formula (6) is diluted with a solvent as necessary, and a platinum-based hydrosilylation catalyst is added thereto. The kind in particular of platinum-type hydrosilylation catalyst is not restrict | limited, A conventionally well-known thing can be used. Furthermore, the organohydrogensiloxane is dropped and reacted at room temperature or higher. After completion of the dropwise addition, after aging under heating, the presence or absence of the raw material organohydrogensiloxane is confirmed by the disappearance of the peak in the GC measurement, for example. By confirming the reaction end point by GC measurement, since organohydrogensiloxane does not remain in the product, a high-purity silicone compound can be obtained. The above reaction may be carried out in a lump.

  After completion of the addition reaction, an excess of the compound represented by the formula (6) is removed from the reaction solution. Examples of the method include stripping under reduced pressure, or washing the reaction product with ion-exchanged water or sodium nitrate water to extract and remove the compound represented by formula (6) into the aqueous layer. At this time, in order to obtain good two-layer separation, it is preferable to use an appropriate amount of a solvent such as toluene or hexane. In particular, by stripping the compound represented by formula (6) from the reaction product under reduced pressure, the silicone compound represented by formula (1) is more than 95% by mass, more preferably about 97% by mass or more, and further 99% by mass. It can be obtained with the above high purity.

  The compound of the present invention has good compatibility with other compounds having a group that polymerizes with the silicone compound, such as a (meth) acryl group (hereinafter referred to as a polymerizable monomer or a hydrophilic monomer). Therefore, a colorless and transparent copolymer can be obtained by copolymerizing with a polymerizable monomer. Further, as described above, the compound of the present invention gives a polymer having excellent hydrolysis resistance. Furthermore, since the compatibility with the fluorine-substituted group-containing (meth) acrylic monomer that imparts stain resistance is also good, a polymer with improved stain resistance (antifouling property) can be provided. In the production of a copolymer containing a repeating unit derived from the silicone compound of the present invention and another polymerizable (hydrophilic) monomer, the blending ratio of the silicone compound of the present invention is polymerizable with the silicone compound of the present invention (hydrophilic). The silicone compound of the present invention is preferably 50 to 90 parts by mass, more preferably 60 to 80 parts by mass with respect to 100 parts by mass in total with the monomers.

  Examples of the polymerizable monomer include (meth) acrylic acid, methyl (meth) acrylate, ethyl (meth) acrylate, (poly) ethylene glycol dimethacrylate, polyalkylene glycol mono (meth) acrylate, polyalkylene glycol monoalkyl ether ( Acrylic monomers such as (meth) acrylate, trifluoroethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2,3-dihydroxypropyl (meth) acrylate; N, N-dimethylacrylamide, N, N-diethylacrylamide , N-acryloylmorpholine, acrylic acid derivatives such as N-methyl (meth) acrylamide; other unsaturated aliphatic or aromatic compounds such as crotonic acid, cinnamic acid, vinyl benzoic acid; and (meth) a Silicone monomers having a polymerizable group such as Lil group. These may be used alone or in combination of two or more.

  Copolymerization of the compound of the present invention with the other polymerizable monomer may be performed by a conventionally known method. For example, it can be carried out using a known polymerization initiator such as a thermal polymerization initiator or a photopolymerization initiator. Examples of the polymerization initiator include 2-hydroxy-2-methyl-1-phenyl-propan-1-one, azobisisobutyronitrile, azobisdimethylvaleronitrile, benzoyl peroxide, tert-butyl hydroperoxide, cumene And hydroperoxide. These polymerization initiators can be used alone or in admixture of two or more. The compounding quantity of a polymerization initiator is 0.001-2 mass parts with respect to a total of 100 mass parts of a polymerization component, Preferably it is 0.01-1 mass part.

  The polymer containing a repeating unit derived from the compound of the present invention is excellent in oxygen permeability, durability of mechanical strength, antifouling property, and excellent in hydrolysis resistance. Therefore, it is suitable for manufacturing ophthalmic devices such as contact lenses, intraocular lenses, and artificial corneas. The manufacturing method of the ophthalmic device using the polymer is not particularly limited, and may be a conventional ophthalmic device manufacturing method. For example, when forming into a lens shape such as a contact lens or an intraocular lens, a cutting method or a mold method can be used.

EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated in detail, this invention is not restrict | limited to the following Example. In the following Examples, the viscosity was measured using a Canon Fenceke viscometer, and the specific gravity was measured using a buoyancy meter. The refractive index was measured using a digital refractometer RX-5000 (manufactured by Atago Co., Ltd.). ¹ H-NMR analysis was performed using JNM-ECP500 (manufactured by JEOL Ltd.) and deuterated chloroform as a measurement solvent.
In the following, the purity of the compound is determined by gas chromatography (GC) measurement under the following conditions.
Gas chromatography (GC) measurement conditions Gas chromatograph: Agilent detector: FID, temperature 300 ° C
Capillary column: HP-5MS (0.25 mm × 30 m × 0.25 μm) from J & W
Temperature increase program: 50 ° C (5 minutes) → 10 ° C / minute → 250 ° C (hold)
Inlet temperature: 250 ° C
Carrier gas: Helium (1.0 ml / min)
Split ratio: 50: 1
Injection volume: 1 μl

[Example 1]
64.6 g (0.32 mol) of the compound of the following formula (10) and 100 g of methylcyclohexane were charged into a 1 liter flask equipped with a stirrer, a Dim funnel, a thermometer, and a dropping funnel, and the temperature was raised to 70 ° C. After adding 0.15 g of a toluene solution (platinum content 0.5%) of a reaction product (complex) of alkali chloroplatinate acid and vinyl siloxane to the flask, 1,1 using a dropping funnel 1,3,5,5,5-heptamethyltrisiloxane 44.4 g (0.2 mol) was dropped into the flask over 1 hour. When the reaction product was analyzed by GC after aging at 100 ° C. for 1 hour, the peak of 1,1,1,3,5,5,5-heptamethyltrisiloxane of the raw material disappeared, indicating that the reaction was complete. . Methylcyclohexane was stripped under reduced pressure to obtain 76.3 g of a silicone compound as a colorless transparent liquid. It was confirmed by ¹ H-NMR analysis that it was a silicone compound represented by the following formula (11) (0.18 mol, yield 89%, silicone compound 1). According to GC measurement, the silicone compound had a purity of 96.3%, a viscosity of 5.4 mm ² / s (25 ° C.), a specific gravity of 0.962 (25 ° C.), and a refractive index of 1.4307. there were.

The ¹ H-NMR spectrum data of the silicone compound 1 is shown below.
0.1 ppm (23H), 0.9 ppm (2H), 2.0 ppm (3H), 3.5-3.8 ppm (6H), 4.3 ppm (2H), 5.6 ppm (1H), 6.1 ppm ( 1H).

[Example 2]
99.0 g (0.75 mol) of diethylene glycol monovinyl ether and 100 g of toluene were charged into a 1 liter flask equipped with a Dim funnel, a thermometer, and a dropping funnel, and the temperature was raised to 70 ° C. After adding 0.38 g of a toluene solution (platinum content 0.5%) of a reaction product (complex) of alkali chloroplatinic acid and vinyl siloxane to the flask, 1,1 using a dropping funnel , 1,3,5,5,5-heptamethyltrisiloxane (111.0 g, 0.5 mol) was dropped into the flask over 1 hour. The internal temperature rose to 85 ° C. When the reaction product was analyzed by GC after aging at 100 ° C. for 1 hour, the peak of the raw material heptamethyltrisiloxane disappeared, indicating that the reaction was complete. 200 g of ion-exchanged water was added to the reaction product, washed with stirring, and allowed to stand for phase separation, and the aqueous layer containing excess diethylene glycol monovinyl ether was removed. Similarly, it was washed twice with 200 g ion-exchanged water, and toluene in the organic layer was stripped under reduced pressure to obtain 159.3 g (yield 90%) of a silicone compound of the following formula (12). The purity of the silicone compound by GC under the following conditions was 99.5% by mass.

  14 liters (0.4 mol) of the obtained silicone compound of the above formula (12), 50.6 g (0.5 mol) of a dehydrochlorinating agent, 500 g of hexane, 2 liters attached with a Dim funnel, a thermometer and a dropping funnel A mixture of 48.1 g (0.46 mol) of methacrylic acid chloride and 50 g of hexane was added dropwise over 1 hour while the flask was charged and the flask was cooled in a water bath. The internal temperature rose from 20 ° C to 30 ° C. The water bath was removed, and the mixture was aged at room temperature while monitoring the peak of the silicone compound of formula (12) with GC. After 10 hours, since the peak of the silicone compound of formula (12) was below the detection limit in GC, 500 g of ion-exchanged water was added to the reaction solution and washed with water. After standing and separating to cut the aqueous layer, it was further washed twice with water. The compound represented by the above formula (11) was obtained by stripping hexane or the like as a solvent under reduced pressure from the organic layer. The resulting compound was a colorless transparent liquid, and the purity of the silicone compound by GC was 98.6% by mass.

得られた化合物は無色透明液体であり、該シリコーン化合物のＧＣによる純度は９８.３質量％であった。 [Comparative Synthesis Example 1]
According to the method described in Example 1 of Japanese Patent No. 4646152 (Patent Document 6), a compound represented by the following formula (13) was synthesized (silicone compound 2).

The obtained compound was a colorless transparent liquid, and the purity of the silicone compound by GC was 98.3 mass%.

得られた化合物は無色透明液体であり、該シリコーン化合物のＧＣによる純度は９８．１％であった。 [Comparative Synthesis Example 2]
According to the method described in Example 2 of Patent No. 4646152 (Patent Document 6), a compound represented by the following formula (14) was synthesized (silicone compound 3).

The obtained compound was a colorless and transparent liquid, and the purity of the silicone compound by GC was 98.1%.

得られた化合物は微黄色透明液体であり、該シリコーン化合物のＧＣによる純度は９７．９％であった。 [Comparative Synthesis Example 3]
According to the method described in Example 1 of Japanese Patent No. 4882136 (Patent Document 3), a compound represented by the following formula (15) was synthesized (silicone compound 4).

The obtained compound was a slightly yellow transparent liquid, and the purity of the silicone compound by GC was 97.9%.

[Evaluation test]
(1) Evaluation of hydrolysis resistance
[Example 3, Comparative Examples 1-3]
The following test was done about each of the silicone compounds 1-4 obtained above.
In a 20 mL screw tube, 0.1 g of silicone compound, 2-propanol (3.90 g), acetic acid (0.24 g), distilled water (0.90 g), and 2,6-di-tert-butyl-4-methylphenol (2 mg) was added and mixed well and sealed. The screw tube was placed at 50 ° C. for 72 hours. The mixed solution immediately after mixing (0 hour) and the mixed solution after 72 hours were subjected to gas chromatography measurement. The measurement conditions for gas chromatography are as described above.
The peak area obtained by gas chromatography measurement is proportional to the amount of components contained. The peak area ratio (%) of the silicone compound after 72 hours to the peak area (100%) of the silicone compound immediately after mixing (0 hour) was calculated, and the weight reduction rate due to hydrolysis was evaluated. The results are shown in Table 1.

  As shown in Comparative Examples 1 to 3, the silicone compounds 2 to 4 were hydrolyzed under the above conditions, and the component content was significantly reduced. In contrast, the silicone compound of the present invention has almost no decrease in the peak area ratio and is excellent in hydrolysis resistance.

Preparation of monomer mixture [Example 4]
Silicone compound 1 obtained in Example 1 (60 parts by mass), N, N-dimethylacrylamide (35 parts by mass), triethylene glycol dimethacrylate (1 part by mass), trifluoroethyl (meth) acrylate (5 parts by mass) Darocur 1173 (Ciba Specialty Chemicals, 0.5 parts by mass) was mixed and stirred to obtain monomer mixture 1.

[Comparative Examples 4 to 6]
In Comparative Examples 4-6, a monomer mixture (monomer mixture 2, 3, 4 in the order of silicone compounds 2, 3, 4) was prepared by the same composition and method as in Example 4 except that silicone compound 1 was replaced with silicone compounds 2-4. 4).

(2) Compatibility with other polymerizable monomers The appearance of the monomer mixtures 1 to 4 obtained above was visually observed. A mixture in which the compatibility between the silicone compound and the other (meth) acrylic compound is good becomes colorless and transparent, but a mixture in which the compatibility is poor causes turbidity. The results are shown in Table 2 below.

(3) Appearance of film (polymer) Each of the monomer mixtures 1 to 4 obtained above was degassed under an argon atmosphere. The mixed solution was poured into a mold sandwiching two quartz glass plates, and irradiated with an ultrahigh pressure mercury lamp for 1 hour to obtain a film having a thickness of about 0.3 mm. The appearance of the film was visually observed. The results are shown in Table 2 below.

(4) Water wettability (surface hydrophilicity) of film (polymer)
The contact angle meter CA-D type (manufactured by Kyowa Interface Science Co., Ltd.) was used to measure the water contact angle (°) for the film produced in (3) above by a liquid appropriate method. The results are shown in Table 2 below.

(5) Contamination resistance of film (polymer) The film produced in (3) above was immersed in a 37 ° C. phosphate buffer solution (PBS (−)) for 24 hours. Each film was immersed in a known artificial lipid solution at 37 ° C. ± 2 ° C. for 8 hours before soaking in PBS (1) and after 24 hours. Thereafter, it was rinsed with PBS (−) and immersed in a 0.1% Sudan black-sesame oil solution. The case where no difference was observed in the dyeing state before and after the immersion was indicated as ◯, and the case where the difference was observed was indicated as ×. The results are shown in Table 2 below.

(6) Durability of film (polymer) Two films were prepared according to the above (3), and after wiping off the surface moisture of one of them, it was washed in a 37 ° C. phosphate buffer (PBS (1)) for 24 hours. Soaked. Each of the films before dipping in PBS (1) and after dipping for 24 hours was cut into a dumbbell shape having a width of 2.0 mm, the upper and lower ends of the test sample were sandwiched with jigs, and the breaking strength and breaking elongation were maintained at a constant speed. Was measured using a fracture tester AGS-50NJ (manufactured by Shimadzu Corporation). In the case where the breaking strength and breaking elongation before and after immersion in PBS (one) change within 10%, each was marked as ◯, and when a decrease exceeding 10% was observed in either one, it was marked as x. The results are shown in Table 2 below.

  As shown in Comparative Examples 4 to 6, silicone compounds 2 to 4 have poor compatibility with other (meth) acrylic monomer compounds and cannot obtain a transparent polymer. Further, the obtained polymer is inferior in water wettability and stain resistance, and further, the mechanical strength is lowered by being immersed in a phosphate buffer. On the other hand, the silicone compound of the present invention is a polymer that has good compatibility with other (meth) acrylic monomers, particularly fluorine monomers, is colorless and transparent, and has excellent water wettability and stain resistance. Furthermore, even when the polymer is immersed in a phosphate buffer, the mechanical strength does not decrease.

  The compound of the present invention provides a polymer having oxygen permeability, colorless and transparent, excellent in hydrophilicity (water wettability) and contamination resistance, and excellent in hydrolysis resistance. Furthermore, a polymer containing a repeating unit derived from the compound of the present invention is excellent in durability even if it is immersed in a phosphate buffer without lowering mechanical strength. Moreover, according to the production method of the present invention, it is possible to provide a compound comprising a single compound having a specific structure with high purity. Therefore, the compound of the present invention and the method for producing the compound are useful for producing ophthalmic devices such as contact lens materials, intraocular lens materials, and artificial cornea materials.

Claims (11)

Compound represented by the following formula (1)

(In the formula (1), k is 2 or 3, n is an integer of ^{1 to 2} , R ¹ and R ² are each independently an alkyl group having 1 to 4 carbon atoms, and R ³ is a hydrogen atom. Or a methyl group). The compound according to claim 1, wherein one of each specific one of k, n, R ¹ , R ² and R ³ in formula (1) comprises more than 95% by mass of the total mass of the compound.   A copolymer comprising a repeating unit derived from the compound according to claim 1 and 2 and another polymerizable compound.   An ophthalmic device comprising the copolymer according to claim 3. A method for producing a compound represented by the following formula (1),

(In the formula (1), k is 2 or 3, n is an integer of ^{1 to 2} , R ¹ and R ² are each independently an alkyl group having 1 to 4 carbon atoms, and R ³ is a hydrogen atom. Or a methyl group)
A silicone compound represented by the following formula (2):

(In the formula (2), k, n, R ¹ and R ² are as described above.)
(Meth) acrylic acid halide represented by the following formula (3)

(In Formula (3), X is Cl, Br, or I, and R ³ is as described above.)
The manufacturing method including the process made to react.   The production method according to claim 5, wherein the reaction is performed in the presence of an acid scavenger.   The production method according to claim 6, wherein the acid scavenger is triethylamine. An organohydrogensiloxane represented by the following formula (4);

(K, R ¹ and R ² are as described above)
A compound represented by the following formula (5):

(N is as described above)
The production method according to any one of claims 5 to 7, further comprising a step of producing a silicone compound represented by the above formula (2) by addition reaction. The production method according to claim 8, wherein one kind of each specific one of k, n, R ¹ , and R ² in formula (2) constitutes more than 95% by mass of the total mass of the compound. A method for producing a compound represented by the following formula (1),

(In the formula (1), k is 2 or 3, n is an integer of ^{1 to 2} , R ¹ and R ² are each independently an alkyl group having 1 to 4 carbon atoms, and R ³ is a hydrogen atom. Or an organohydrogensiloxane represented by the following formula (4):

(K, R ¹ and R ² are as described above)
A compound represented by the following formula (6):

(N and R ³ are as described above)
The manufacturing method including the process made to react. 1. Each of the specific ones having k, n, R ¹ , R ² and R ³ in formula (1) constitutes more than 95% by mass of the total mass of the compound. The manufacturing method of description.