JP3184211B2 - Method for producing oxygen-permeable polymer material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing an oxygen-permeable polymer material, and particularly to an oxygen-permeable polymer material extremely useful as an ophthalmic material such as a contact lens or an intraocular lens. It relates to a manufacturing method.

[Conventional technology]

Conventionally, various plastic materials, for example, polymethyl methacrylate, have been used as ophthalmic materials such as contact lenses and intraocular lenses. However, conventional ophthalmic materials have low oxygen permeability, and also have a problem that they cannot be worn for a long time when used as a contact lens, for example, because dirt components in tears and intraocular fluid are easily adsorbed or fixed. Was something.

Under such circumstances, a highly water-containing soft contact lens containing poly (N-vinyl-2-pyrrolidone) as a main component, which can be worn for a long time as a contact lens, has been developed. Due to its low mechanical strength, it is necessary to perform boiling disinfection in order to use it as a contact lens due to contamination by water.
There was a problem that handling was extremely complicated.

In recent years, as an ophthalmic material that overcomes such disadvantages,
A polymer material obtained by copolymerizing siloxanyl mono (meth) acrylate and fluoro (meth) acrylate has been proposed.

[Problems to be solved by the invention]

However, the properties of the above-mentioned polymer materials differ greatly depending on the copolymerization ratio of siloxanyl mono (meth) acrylate and fluoro (meth) acrylate. The oxygen permeability is improved by increasing the copolymerization ratio of siloxanyl mono (meth) acrylate. However, the adsorption or fixation of the dirt component becomes remarkable, and the material becomes brittle and too soft. Conversely, if the copolymerization ratio of fluoro (meth) acrylate is increased, the dirt component becomes difficult to be adsorbed or fixed, but the oxygen permeability However, there was a problem that was reduced.

Therefore, an object of the present invention is to solve the above-mentioned problems, have high oxygen permeability, do not adsorb or fix dirt components in tears or intraocular fluid, do not stain, and have excellent workability. An object of the present invention is to provide a method for producing an oxygen-permeable polymer material suitably used as an ophthalmic material such as a contact lens and an intraocular lens.

[Means for solving the problem]

The present invention provides the following general formula (I) (In the formula, R ¹ represents a hydrogen atom, a methyl group, a fluorine atom or a fluoromethyl group, R ² and R ³ represent an alkyl group having 1 to 8 carbon atoms, and R ⁴ and R ⁵ are substituted with a fluorine atom. Represents an alkyl group having 1 to 8 carbon atoms, a phenyl group, a vinyl group or a hydrogen atom, and two X's may be the same or different, and are each a divalent hydrocarbon group having 1 to 3 carbon atoms And n represents an integer of 0 to 200, preferably 0 to 50. Where n groups May be the same or different. Production of an oxygen-permeable polymer material characterized by polymerizing or copolymerizing one or more of (fluoro) siloxanyl di (meth) acrylates (hereinafter referred to as “monomer (A)”) represented by It provides a method.

In the general formula (I) representing the monomer (A) used in the present invention, examples of the alkyl group having 1 to 8 carbon atoms represented by R ² and R ³ include a methyl group, an ethyl group, and an n-propyl group. , I-propyl group, n-butyl group, i-butyl group,
Examples thereof include a linear or branched alkyl group such as a tert-butyl group, a pentyl group, an isopentyl group, a hexyl group, a 2-methylbutyl group, a heptyl group, and an octyl group. Examples of the alkyl group having 1 to 8 carbon atoms represented by R ⁴ and R ⁵ include the same as those described above. Examples of the alkyl group having 1 to 8 carbon atoms substituted by a fluorine atom include trifluoromethyl Group, trifluoroethyl group, trifluoropropyl group, pentafluorobutyl group, heptafluoropentyl group, nonafluorohexyl group and the like. Among them, an alkyl group having 1 to 4 carbon atoms or a fluoroalkyl group is particularly preferred.

In addition, specific examples of the monomer (A) in the present invention include the following.

These monomers (A) are produced, for example, according to the following reaction formula.

Wherein R ¹ , R ² , R ³ , R ⁴ , R ⁵ and X have the same meaning as described above. The monomer (A) may be polymerized or copolymerized singly or in combination of two or more. It can be polymerized.

Further, in the present invention, (fluoro) siloxanyl mono (meth) acrylate and / or fluoro ((meth) acrylate (hereinafter, these are referred to as “monomer (B)”) are copolymerized with the monomer (A). By doing so, it is possible to produce a material with further improved oxygen permeability, or with improved difficulty in adsorbing or fixing dirt components.

Examples of the monomer (B) used here include the following.

Pentamethyldisiloxanylmethyl methacrylate,
Pentamethyldisiloxanylmethyl acrylate, pentamethyldisiloxanylpropyl methacrylate, pentamethyldisiloxanylpropyl acrylate, methyl bis (trimethylsiloxy) silylpropyl methacrylate, methylbis (trimethylsiloxy) silylpropyl acrylate, tris (trimethylsiloxy) Silylpropyl methacrylate, tris (trimethylsiloxy) silylpropyl acrylate, methylbis (trimethylsiloxy) silylpropylglycerol methacrylate, methylbis (trimethylsiloxy) silylpropylglycerol acrylate, tolyl (trimethylsiloxy) silylpropylglycerol methacrylate, tris (trimethylsiloxy) silylpropyl Glycerol acrylate, molybdenum (Methylbis (trimethylsiloxy) siloxy) bis (trimethylsiloxy) silylpropylglycerol methacrylate, mono (methylbis (trimethylsiloxy) siloxy) bis (trimethylsiloxy) silylpropylglycerol acrylate, trimethylsilylethyltetramethyldisiloxanylpropyl glycerol methacrylate, trimethylsilyl Siloxanyl mono (meth) acrylates such as ethyltetramethyldisiloxanylpropylglycerol acrylate; (3,3,3-trifluoropropyldimethylsiloxy) bis (trimethylsiloxy) silylmethyl methacrylate, (3,3,3-trifluoropropyl Dimethylsiloxy) bis (trimethylsiloxy) silylmethyl methacrylate, (3,3,4,4,5,5,5-heptafluoropentene) Dimethylsiloxy) (methylbis (trimethylsiloxy) siloxy) trimethylsiloxysilylpropyl methacrylate, (3,3,4,4,5,5,5-heptafluoropentyldimethylsiloxy) (methylbis (trimethylsiloxy) siloxy) trimethylsiloxysilyl Propyl acrylate, fluorosiloxanyl mono (meth) acrylate such as (3,3,4,4,5,5,5-heptafluoropentyldimethylsiloxy) (pentamethyldisiloxanyloxy) trimethylsiloxysilyl methacrylate; 2,2-
Trifluoroethyl methacrylate, 2,2,2-trifluoroethyl acrylate, 2,2,2-trifluoroethyl-α-fluoroacrylate, 2,2,2-trifluoroethyl-α-trifluoromethyl methacrylate, 2, 2,3,
3-tetrafluoropropyl methacrylate, 2,2,3,3-
Tetrafluoropropyl acrylate, 2,2,3,3,3-pentafluoropropyl methacrylate, 2,2,3,3,3-pentafluoropropyl acrylate, 2,2,2,2 ′, 2 ′,
2'-hexafluoroisopropyl methacrylate, 2,
2,2,2 ', 2', 2'-hexafluoroisopropyl acrylate, 2,2,3,4,4,4-hexafluorobutyl methacrylate, 2,2,3,4,4,4-hexafluorobutyl Acrylate, 2,2,3,3,4,4,5,5-octafluoropentyl methacrylate, 2,2,3,3,4,4,5,5-octafluoropentyl acrylate, 2,2,3, 3,4,4,5,5,6,6,7,7-dodecafluoroheptyl methacrylate, 2,2,3,3,4,4,5,5,6,6,6
7,7-dodecafluoroheptyl acrylate, 2,2,3,3,
4,4,5,5,6,6,7,7,8,8,9,9-hexadecafluorononyl methacrylate, 2,2,3,3,4,4,5,5,6,6, 7,7,8,8,9,9−
Hexadecafluorononyl acrylate, 3,3,4,4,5,5,
6,6,7,7,8,8,8-tridecafluorooctyl methacrylate, 3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl Acrylate, 2,2,3,3-tetrafluoro-1
-Methylpropyl methacrylate, 2,2,3,3-tetrafluoro-1-methylpropyl acrylate, 2,2,3,3-
Tetrafluoro-1,1-dimethylpropyl methacrylate, 2,2,3,3-tetrafluoro-1,1-dimethylpropyl acrylate, 2,2,3,3,4,4,5,5-octafluoro-1 , 1
-Dimethylpentyl methacrylate, 2,2,3,3,4,4,5,5
Fluoro (meth) acrylates such as octafluoro-1,1-dimethylpentyl acrylate.

Among these monomers (B), those particularly preferably used in the present invention include pentamethyldisiloxanylmethyl methacrylate, pentamethyldisiloxanylpropyl methacrylate, methylbis (trimethylsiloxy) silylpropyl methacrylate, Siloxanyl mono (meth) acrylates such as tris (trimethylsiloxy) silylpropyl methacrylate; (3,3,3-trifluoropropyldimethylsiloxy) bis (trimethylsiloxy) silylmethyl methacrylate, (3,3,4,4,5,5) ,
5-heptafluoropentyldimethylsiloxy) (methylbis (trimethylsiloxy) siloxy) trimethylsiloxysilylpropyl methacrylate, (3,3,4,4,5,5,5
Fluorosiloxanyl mono (meth) acrylates such as 5-heptafluoropentyldimethylsiloxy) (pentamethyldisiloxanyloxy) trimethylsiloxysilyl methacrylate; 2,2,2-trifluoroethyl methacrylate, 2,2,2-tri Fluoroethyl-α-fluoroacrylate, 2,2,2-trifluoroethyl-α-trifluoromethyl methacrylate, 2,2,3,3-tetrafluoropropyl methacrylate, 2,2,3,3,3-pentafluoro Propyl methacrylate, 2,2,2,2 ', 2', 2'-
Hexafluoroisopropyl methacrylate, 2,2,3,4,
4,4-hexafluorobutyl methacrylate, 2,2,3,3,
4,4,5,5-octafluoropentyl methacrylate, 2,
2,3,3,4,4,5,5,6,6,7,7-dodecafluoroheptyl methacrylate, 3,3,4,4,5,5,6,6,7,7,8,8 , 8-Tridecafluorooctyl methacrylate, 2,2,3,3-tetrafluoro-1-methylpropyl methacrylate, 2,2,3,3-
And fluoro (meth) acrylates such as tetrafluoro-1,1-dimethylpropyl methacrylate and 2,2,3,3,4,4,5,5-octafluoro-1,1-dimethylpentyl methacrylate.

These monomers (B) can be copolymerized with the monomer (A) alone or in combination of two or more.

Here, the usage ratio of the monomer (A) and the monomer (B) is usually 10 to 100% by weight of the monomer (A) and 0 to 90% by weight of the monomer (B), Preferably monomer (A)
Is 20 to 90% by weight, and the monomer (B) is 10 to 80% by weight.

Further, in the production method of the present invention, other than the above-mentioned monomer (A) and monomer (B), other monomers may be copolymerized within a range not to impair the effects of the present invention. Can be.

Such other monomers include, for example, monomer (A)
Other than ethylene glycol dimethacrylate, ethylene glycol diacrylate, diethylene glycol dimethacrylate, diethylene glycol diacrylate,
Triethylene glycol dimethacrylate, triethylene glycol diacrylate, tetraethylene glycol dimethacrylate, tetraethylene glycol diacrylate, propylene glycol dimethacrylate, propylene glycol diacrylate, 1,4-butanediol dimethacrylate, 1,4-butanediol di Crosslinkable monomers represented by polyfunctional monomers such as acrylate, neopentyl glycol dimethacrylate, neopentyl glycol diacrylate, trimethylolpropane trimethacrylate, and trimethylolpropane triacrylate, methyl methacrylate, methyl acrylate, and ethyl Methacrylate, ethyl acrylate, isopropyl methacrylate, isopropyl acrylate,
Alkyl mono (meth) acrylates represented by butyl methacrylate, butyl acrylate, tertiary butyl methacrylate, tertiary butyl acrylate, cyclohexyl methacrylate, cyclohexyl acrylate, benzyl methacrylate, benzyl acrylate, isobornyl methacrylate, isobornyl acrylate, and the like; and Examples include hydrophilic monomers typified by N-vinyl-2-pyrrolidone, 2-hydroxyethyl methacrylate and the like.

The crosslinkable monomer is not particularly essential since the monomer (A) in the present invention is a bifunctional monomer. It is used to improve workability such as workability,
The copolymerization ratio is usually 30% by weight or less, preferably 20% by weight or less. If the copolymerization ratio exceeds 30% by weight, the obtained material may be brittle or the oxygen permeability may be low.

The alkyl mono (meth) acrylate is used to improve the strength, processability, etc. of the obtained material, and its copolymerization ratio is usually 50% by weight so as not to impair the oxygen permeability of the obtained material. %, Preferably 40% by weight or less.

In addition, the hydrophilic monomer is used when imparting hydrophilicity to the surface of the obtained material, but if the copolymerization ratio of the hydrophilic monomer is increased, the oxygen permeability of the obtained material is impaired. The copolymerization ratio is usually 20% by weight or less, preferably 15% by weight or less.

The polymerization or copolymerization in the present invention can be carried out by a usual radical polymerization reaction, for example, a method in which the temperature is raised stepwise in the presence of a thermal polymerization initiator such as benzoyl peroxide and azobisisobutyronitrile to carry out polymerization. Alternatively, the polymerization can be carried out by irradiating ultraviolet rays in the presence of a photopolymerization initiator such as benzoin, benzophenone, and Michler's ketone to carry out polymerization. Here, a photopolymerization initiator or a thermal polymerization initiator is usually used per 100 parts by weight of the monomer mixture.
0.01 to 5 parts by weight are used.

In addition, when the material obtained by the present invention is used for applications requiring familiarity with tears and intraocular fluid, such as contact lenses and intraocular lenses, the material is processed into the shape of contact lenses and intraocular lenses. After that, hydrophilicity is imparted to the surface by further performing alkali treatment, plasma treatment with oxygen or nitrogen, plasma polymerization with a compound containing a hydrophilic group, or surface treatment by vapor deposition, sputtering or ion plating of an inorganic oxide. can do.

〔Example〕

Hereinafter, the present invention will be described with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

The evaluation criteria of workability and the test methods of various tests in the following Examples and Comparative Examples are as follows.

Evaluation criteria for workability Machinability A: The cut surface is glossy B: The cut surface is glossy but slightly opaque C: The cut surface becomes rough and white Abrasive A: The polished surface is good gloss B: Polished Unevenness occurs C: The polished surface becomes rough and white Oxygen permeability coefficient test method Using the obtained contact lens, Rika Seiki Co., Ltd. Kaken type film oxygen permeation meter is used.
% In normal saline.

Test Method for Visible Light Transmittance Using the obtained disk, the transmittance at 500 to 600 nm was measured with a double beam spectrophotometer 200-20 manufactured by Meikyaku Seisakusho Co., Ltd.

Test method for dirtability The obtained disk was immersed in a dirt solution for 30 days, and then washed with a contact lens cleaner (all-way cleaner manufactured by Ricky Contact Lens Co., Ltd.) to remove dirt attached to the surface. It was expressed as a change rate of the visible light transmittance when the visible light transmittance before immersion was set to 100. The dirt solution was a mixture of 0.1 part by weight of ovalbumin, 0.1 part by weight of egg white lysozyme, 0.1 part by weight of bovine stomach mucosa mucin, 0.1 part by weight of egg yolk lecithin and 100 parts by weight of purified water. Replaced with fresh stain.

Example 1 The following formula: 45 parts by weight of siloxanyl dimethacrylate represented by
2,2,2-trifluoroethyl methacrylate 45 parts by weight,
Tris (trimethylsiloxy) silylpropyl methacrylate (10 parts by weight) and benzoin methyl ether (0.1 parts by weight) as a weight initiator are mixed well at room temperature, and the mixture is poured into a polyethylene polymerization vessel.
Ultraviolet rays were irradiated for 16 hours at room temperature to copolymerize.

After the copolymerization, the obtained block copolymer was cut and polished to form a contact lens and a disk having a thickness of 0.2 mm and a diameter of 15 mm, thereby evaluating workability, and then performing various tests. The results are shown in Table 1.

Example 2 The following formula: Siloxanyl dimethacrylate represented by 60 parts by weight,
35 parts by weight of 2,2,3,3-tetrafluoropropyl methacrylate, 5 parts by weight of ethylene glycol dimethacrylate and 0.1 part by weight of benzoin methyl ether as a polymerization initiator are mixed well at room temperature, and the mixed solution is placed in a polyethylene polymerization vessel. UV light at room temperature under nitrogen atmosphere
Irradiated for 16 hours to copolymerize.

After the copolymerization, the obtained block copolymer was cut and polished to form a contact lens and a disk having a thickness of 0.2 mm and a diameter of 15 mm, thereby evaluating workability, and then performing various tests. The results are shown in Table 1.

Comparative Example 1 Tris (trimethylsiloxy) silylpropyl methacrylate 45 parts by weight, 2,2,2-trifluoroethyl methacrylate 50 parts by weight, ethylene glycol dimethacrylate 5 parts by weight, and benzoin methyl ether 0.1 part by weight as a polymerization initiator were added at room temperature. The mixture was mixed well, poured into a polyethylene polymerization vessel, and irradiated with ultraviolet rays for 16 hours at room temperature under a nitrogen atmosphere to copolymerize.

After the copolymerization, the obtained block copolymer was cut and polished to form a contact lens and a disk having a thickness of 0.2 mm and a diameter of 15 mm, thereby evaluating workability, and then performing various tests. The results are shown in Table 1.

[Effects of the Invention] The oxygen-permeable polymer material produced according to the present invention has an extremely high oxygen permeability, and adsorbs dirt components in tears and intraocular fluid and dirt caused by various use environments. It has an excellent feature that it is hard to adhere, and also has good workability such as machinability and abrasiveness. Therefore, the oxygen-permeable polymer material produced by the present invention is suitably used as an ophthalmic material such as a contact lens and an intraocular lens.

Continuation of front page (72) Inventor Osamu Kurita 2-11-24 Tsukiji, Chuo-ku, Tokyo Japan Synthetic Rubber Co., Ltd. (56) References JP-A-59-77411 (JP, A) JP-A-3-160009 (JP, A) JP-A-3-294818 (JP, A) JP-A-3-240021 (JP, A) JP-A-3-257421 (JP, A) JP-A-3-43711 (JP, A) Unexamined Japanese Patent Publication No. Hei 2-304093 (JP, A) JP-A-4-23819 (JP, A) Polym. Bull. , 9 [6-7] (1983) (Germany). 255-259 (58) Field surveyed (Int. Cl. ⁷ , DB name) C08F 230/08 C08F 299/08

Claims (1)

(57) [Claims] (1) The following general formula (I) Wherein, R ¹ represents a fluorine atom or a trifluoromethyl group, R ² and R ³ represents an alkyl group having 1 to 8 carbon atoms, R ⁴
And R ⁵ have 1 carbon atom which may be substituted by a fluorine atom
And X represents an alkyl group, a phenyl group, a vinyl group, or a hydrogen atom, and two X's may be the same or different; each represents a divalent hydrocarbon group having 1 to 3 carbon atoms;
Indicates an integer from to 200. Where n groups May be the same or different. ] A method for producing an oxygen-permeable polymer material, characterized by polymerizing or copolymerizing one or more of (fluoro) siloxanyl di (meth) acrylates represented by