WO2022131120A1 - コンタクトレンズ用モノマー組成物、コンタクトレンズ用重合体、並びにコンタクトレンズ及びその製造方法 - Google Patents
コンタクトレンズ用モノマー組成物、コンタクトレンズ用重合体、並びにコンタクトレンズ及びその製造方法 Download PDFInfo
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- WO2022131120A1 WO2022131120A1 PCT/JP2021/045303 JP2021045303W WO2022131120A1 WO 2022131120 A1 WO2022131120 A1 WO 2022131120A1 JP 2021045303 W JP2021045303 W JP 2021045303W WO 2022131120 A1 WO2022131120 A1 WO 2022131120A1
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- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- VHRYZQNGTZXDNX-UHFFFAOYSA-N methacryloyl chloride Chemical compound CC(=C)C(Cl)=O VHRYZQNGTZXDNX-UHFFFAOYSA-N 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- OVHHHVAVHBHXAK-UHFFFAOYSA-N n,n-diethylprop-2-enamide Chemical compound CCN(CC)C(=O)C=C OVHHHVAVHBHXAK-UHFFFAOYSA-N 0.000 description 1
- BUGISVZCMXHOHO-UHFFFAOYSA-N n-[1,3-dihydroxy-2-(hydroxymethyl)propan-2-yl]-2-[[1-[[1,3-dihydroxy-2-(hydroxymethyl)propan-2-yl]amino]-2-methyl-1-oxopropan-2-yl]diazenyl]-2-methylpropanamide Chemical compound OCC(CO)(CO)NC(=O)C(C)(C)N=NC(C)(C)C(=O)NC(CO)(CO)CO BUGISVZCMXHOHO-UHFFFAOYSA-N 0.000 description 1
- PNLUGRYDUHRLOF-UHFFFAOYSA-N n-ethenyl-n-methylacetamide Chemical compound C=CN(C)C(C)=O PNLUGRYDUHRLOF-UHFFFAOYSA-N 0.000 description 1
- RQAKESSLMFZVMC-UHFFFAOYSA-N n-ethenylacetamide Chemical compound CC(=O)NC=C RQAKESSLMFZVMC-UHFFFAOYSA-N 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- HMMGMWAXVFQUOA-UHFFFAOYSA-N octamethylcyclotetrasiloxane Chemical compound C[Si]1(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O1 HMMGMWAXVFQUOA-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000002953 phosphate buffered saline Substances 0.000 description 1
- 229950004354 phosphorylcholine Drugs 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229940074545 sodium dihydrogen phosphate dihydrate Drugs 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- SGGROIVRVHNDJL-UHFFFAOYSA-N tert-butyl hexaneperoxoate Chemical compound CCCCCC(=O)OOC(C)(C)C SGGROIVRVHNDJL-UHFFFAOYSA-N 0.000 description 1
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 125000005270 trialkylamine group Chemical group 0.000 description 1
- ITMCEJHCFYSIIV-UHFFFAOYSA-N triflic acid Chemical compound OS(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F230/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal
- C08F230/04—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal containing a metal
- C08F230/08—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal containing a metal containing silicon
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/04—Contact lenses for the eyes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L43/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing boron, silicon, phosphorus, selenium, tellurium or a metal; Compositions of derivatives of such polymers
- C08L43/04—Homopolymers or copolymers of monomers containing silicon
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
- G02B1/043—Contact lenses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/00038—Production of contact lenses
Definitions
- the present invention relates to a contact lens composed of a monomer composition for contact lenses, a polymer of the composition, and a hydrate of the polymer, and a method for producing the same.
- Silicone hydrogel is a material that is widely used in ophthalmic lenses such as contact lenses because it has high oxygen permeability and therefore does not burden the eyes.
- the silicone hydrogel tends to lack wettability and lubricity due to the inclusion of hydrophobic silicone. Therefore, surface hydrophilization by a surface modification method and surface hydrophilicization by mixing a hydrophilic monomer in a lens composition before curing have been studied.
- the phosphorylcholine group is known to have excellent biocompatibility and extremely high hydrophilicity. Therefore, a method of improving the hydrophilicity of the lens surface by using a phosphorylcholine group-containing methacrylic ester monomer (MPC) has been proposed.
- MPC methacrylic ester monomer
- Patent Documents 1 to 4 disclose a monomer composition containing a silicone monomer having a hydroxyl group and MPC, and it is becoming possible to obtain a silicone hydrogel lens having high surface hydrophilicity.
- methacrylic acid is being studied as a method for further improving the hydrophilicity of the lens surface. Since methacrylic acid has higher hydrophilicity than general hydrophilic monomers, it is expected that the hydrophilicity will be further improved by incorporating it into a lens. However, methacrylic acid has poor compatibility with the silicone portion in the lens, the water content of the contact lens tends to change, and there is a problem in stability.
- a contact lens produced from a monomer composition containing a phosphorylcholine group-containing polysiloxane monomer of the following formula (1) as a raw material has good stability even in the coexistence of methacrylic acid.
- a represents an integer from 20 to 500;
- b represents an integer from 1 to 70;
- c represents an integer from 1 to 70;
- d represents 0 or 1.
- p and q represent 0 or 1, respectively.
- X represents -CH 2- or -CH 2 CH 2- ;
- R represents an alkyl group having 2 to 18 carbon atoms.
- silicone hydrogel contact lenses that are widely used need to be replaced at regular intervals, and the replacement period includes those that are replaced every other day and those that are replaced for two weeks or one month.
- the same lens is repeatedly worn and used, so it is important that the shape of the lens does not change when used repeatedly.
- the modulus and elongation at break of a contact lens are greatly related to the shape stability of the contact lens.
- the surface hydrophilicity of the lens surface is sufficient and the stability is good, but there is room for improvement in the modulus and the elongation at break.
- the subject of the present invention is a monomer composition for contact lenses containing the phosphorylcholine group-containing polysiloxane monomer described in the formula (1), which exhibits good stability and is excellent in modulus and elongation at break.
- a monomer composition for contact lenses capable of producing the same.
- excellent in modulus refers to those having a modulus of 0.3 MPa or more and 0.8 MPa or less in the mechanical strength measurement described in detail in the examples.
- excellent in breaking elongation refers to those having a breaking elongation of 200% or more in the mechanical strength measurement described in detail in the examples.
- Another object of the present invention is to provide a composition and a polymer that can be suitably used for obtaining the above contact lens.
- a phosphorylcholine group-containing polysiloxane monomer represented by the formula (1) a specific siroxanyl group-containing silicone monomer, a hydroxyethyl (meth) acrylate, and a hydroxy. It has been found that the above object can be achieved by a monomer composition containing a hydrophilic monomer selected from propyl (meth) acrylate and hydroxybutyl (meth) acrylate as an essential component and methacrylic acid in a specific range. , The present invention has been completed.
- p and q represent 0 or 1, respectively.
- the content ratio of the component (B) is 10 to 40% by mass
- the content ratio of the component (C) is 10 to 30% by mass
- the content ratio of the component (D) is 0.1 to 5% by mass.
- Monomer compositions for contact lenses are provided.
- the content ratio of the component (A) is 10 to 45% by mass
- the content ratio of the component (B) is 10 to 40% by mass
- the content ratio of the component (C) is 10 to 30% by mass
- ( A monomer composition for a contact lens is provided in which the content ratio of the component D) is 0.1 to 5% by mass and the content ratio of the component (E) is 0 to 50% by mass.
- Equation 1 a represents an integer from 20 to 500. b represents an integer from 1 to 70. c represents an integer from 1 to 70. d indicates 0 or 1. p and q indicate 0 or 1, respectively.
- X represents -CH 2- or -CH 2 CH 2- .
- R represents an alkyl group having 2 to 18 carbon atoms.
- a contact lens polymer comprising a polymer of the above contact lens monomer composition.
- a contact lens made of a hydrate of the polymer for contact lenses and a method for producing the same.
- the present invention is as follows. 1.
- A Containing a phosphorylcholine group-containing polysiloxane monomer represented by the following formula (1) and (B) containing a siroxanyl group having at least one hydroxyl group in the molecule represented by the following formula (2) or (3).
- the content ratio of the component (B) is 10 to 40% by mass
- the content ratio of the component (C) is 10 to 30% by mass
- the content ratio of the component (D) is 0.
- a monomer composition for a contact lens having a content of 1 to 5% by mass and a content of the component (E) of 0 to 50% by mass.
- Equation 1 a represents an integer from 20 to 500. b represents an integer from 1 to 70. c represents an integer from 1 to 70. d indicates 0 or 1. p and q indicate 0 or 1, respectively.
- X represents -CH 2- or -CH 2 CH 2- .
- R represents an alkyl group having 2 to 18 carbon atoms.
- the composition further contains a solvent having a hydroxyl group (F), and the content ratio of the component (F) is 30 with respect to a total of 100 parts by mass of the components (A) to (E) in the composition.
- the monomer composition for contact lenses according to item 1 above which is not more than parts by mass.
- a polymer for contact lenses which comprises a polymer of the monomer composition for contact lenses according to the above item 1 or 2.
- a contact lens in which the modulus of the contact lens according to item 4 above is in the range of 0.3 MPa or more and 0.8 MPa or less. 6.
- a method for producing a contact lens comprising 1) and (2) a step of immersing the polymer in physiological saline to hydrate it.
- the contact lens of the present invention is manufactured using the monomer composition for contact lenses of the present invention, excellent modulus, elongation at break, and stability can be exhibited at the same time.
- the monomer composition for contact lenses of the present invention may contain the components (A) to (D) described later as essential monomer components, and may further contain the component (E) as an arbitrary monomer component, and further optionally.
- the component (F) may be contained as the solvent component of.
- the polymer for contact lenses of the present invention is obtained from the polymer of the monomer composition for contact lenses of the present invention. Further, the contact lens of the present invention is obtained from the polymer for contact lenses of the present invention. In addition, the contact lens of the present invention may be a hydrate of the polymer for contact lenses of the present invention.
- the monomer composition for contact lenses of the present invention is simply referred to as a composition.
- the polymer for contact lenses of the present invention is simply referred to as a polymer.
- excellent in modulus in the present invention means that the modulus is 0.3 MPa or more and 0.8 MPa or less in the mechanical strength measurement described in detail in Examples, although the numerical value is not particularly limited.
- excellent in breaking elongation is not particularly limited in numerical value, but preferably means that the breaking elongation is 200% or more in the mechanical strength measurement described in detail in Examples.
- the component (A) is a phosphorylcholine group-containing polysiloxane monomer represented by the following formula (1).
- the component (A) is a component that contributes to improving the stability and surface hydrophilicity of the manufactured contact lens.
- the number average molecular weight of the phosphorylcholine group-containing polysiloxane monomer of the present invention is preferably 2,000 to 50,000.
- a represents an integer from 20 to 500.
- b represents an integer from 1 to 70.
- c represents an integer from 1 to 70.
- d indicates 0 or 1.
- p and q indicate 0 or 1, respectively.
- X represents -CH 2- or -CH 2 CH 2- .
- R represents an alkyl group having 2 to 18 carbon atoms.
- a, b and c are not particularly limited as long as they are within the above range, but a is 20 to 500, preferably 20 to 300, more preferably 20 to 200, still more preferably 25 to 170, and particularly preferably.
- Is 30 to 120, b is 1 to 70, preferably 1 to 40, more preferably 1 to 20, still more preferably 1 to 10, particularly preferably 1 to 3, and c is 1 to 1. 70, preferably 1 to 40, more preferably 1 to 20, still more preferably 1 to 10, and particularly preferably 1 to 5.
- the content ratio of the component (A) is 10 to 45% by mass, preferably 15 to 35% by mass. .. If it is less than 10% by mass, the transparency of the polymer is lowered, and if it is more than 45% by mass, the surface hydrophilicity of the polymer is lowered.
- the phosphorylcholine group-containing polysiloxane monomer represented by the formula (1), which is a component (A), can be synthesized by various methods and is not particularly limited. For example, the following method can be mentioned.
- the silicone intermediate represented by the formula (4) used in the synthesis of the phosphorylcholine group-containing polysiloxane monomer of the present invention can be synthesized by a known method.
- a trialkylamine such as triethylamine, a dialkylamine such as diisopropylamine, and an organic amine such as diazabicycloundecene are used. It is possible to use an aprotic solvent during the reaction. Tetrahydrofuran is preferable from the viewpoint of solubility.
- p and q represent 0 or 1, respectively.
- n represents an integer from 0 to 10.
- p and q represent 0 or 1, respectively.
- n represents an integer from 0 to 10.
- R is an alkyl group having 2 to 18 carbon atoms and contains a linear and branched structure.
- R include ethyl group, propyl group, butyl group, pentyl group, isopentyl group, hexyl group, isohexyl group, octyl group and the like. Can be done.
- the alkyl group-containing cyclic silicone represented by the formula (6) includes 1,3,5,7-tetramethylcyclotetrasiloxane and various alkene having 2 to 18 carbon atoms (eg, ethylene, propylene, butylene, pentylene, and heicylene).
- 2-Methylpentylene is synthesized by performing a hydrosilylation reaction, which is an addition reaction. If necessary, it is possible to remove the catalyst used in the reaction by adsorption treatment or liquid separation operation, and to remove unreacted components by reducing the pressure.
- an acid catalyst such as trifluoromethanesulfonic acid
- a hydrosilyl group-containing silicone intermediate represented by the formula (7) hydrosilyl group-containing double-ended methacrylic silicone
- a indicates an integer from 20 to 500.
- b indicates an integer from 1 to 70.
- c indicates an integer from 1 to 70.
- p and q indicate 0 or 1, respectively.
- R indicates the number of carbon atoms 2. Represents 18 alkyl groups.
- a and b are not particularly limited as long as they are within the above range, but a is 20 to 500, preferably 50 to 300, more preferably 70 to 200, and b is 1 to 70, preferably 2 to 40, and more. It is preferably 3 to 15, c is 1 to 70, preferably 2 to 40, and more preferably 3 to 15.
- the acid catalyst after the reaction is removed by a known method.
- it can be removed by washing with water or adsorbing with sodium hydrogen carbonate or the like.
- a hydrosilyl group-containing double-ended methacrylic silicone represented by the formula (7) and a phosphorylcholine compound represented by the formula (9) are subjected to a hydrosilylation reaction as an addition reaction, and an excessive amount of the compound of the formula (9) is used with a solvent or the like.
- the phosphorylcholine group-containing polysiloxane monomer of the formula (1) can be obtained by removing the above and removing the low boiling point component by reducing the pressure.
- the compound of the formula (9) is an alcohol represented by the formula (8) and 2-chloro-2-oxo-1,3,2-dioxaphosphorane (COP) in an aprotic solvent such as acetonitrile. Is then reacted with trimethylamine in an aprotic solvent such as acetonitrile.
- d indicates 0 or 1.
- d 0 or 1.
- the component (B) is a siroxanyl group-containing silicone monomer having at least one hydroxyl group in the molecule represented by the following formula (2) or (3). These hydroxyl group-containing siloxanyl group-containing monomers can be suitably used as raw materials for ophthalmic devices.
- the content ratio of the component (B) is 10 to 40% by mass, preferably 20 to 35% by mass. ..
- the content ratio of the component (B) is less than 10% by mass, the transparency of the produced polymer for contact lenses is lowered.
- it exceeds 40% by mass there is a concern that the surface hydrophilicity of the contact lens becomes insufficient.
- the component (C) is one or more hydrophilic monomers selected from hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, and hydroxybutyl (meth) acrylate.
- the component (C) is a component that contributes to improving the modulus of the manufactured contact lens.
- Specific examples of the component (C) include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 2-hydroxybutyl (meth) acrylate. ..
- (meth) acrylate means “acrylate and / or methacrylate”
- (meth) acrylic means “acrylic and / or methacrylic”.
- the content ratio of the component (C) is 10 to 30% by mass, preferably 15 to 25% by mass. .. If the content of the component (C) is less than 10% by mass, the elongation at break is not sufficient. On the other hand, if it exceeds 30% by mass, the modulus may become too high and the wearing feeling may be deteriorated.
- the component (D) is methacrylic acid.
- the component (D) is a component that makes it easier to improve the surface hydrophilicity of the manufactured contact lens.
- the content ratio of the component (D) is 0.1 to 5% by mass, preferably 0.2 to 2 It is mass%. If the content of the component (D) is less than 0.1% by mass, the effect of improving the hydrophilicity of the produced contact lens cannot be sufficiently obtained. On the other hand, if it exceeds 5% by mass, the stability of the contact lens is lowered.
- the component (E) is a hydrophilic monomer other than the component (C).
- the component (E) is an optional component and can be blended for the purpose of adjusting the water content in the contact lens.
- Examples of the component (E) include an alkyl (meth) acrylate having an alkyl group having 1 to 4 carbon atoms, a monomer having a hydrophilic group, and the like.
- the monomer having a hydrophilic group has at least one group selected from a hydroxyl group, an amino group, an amide group, a carboxyl group, an ether group and a phosphorylcholine group, and has a vinyl group, a (meth) acryloyl group and the like.
- component (E) includes alkyl methacrylates such as 2-methacryloyloxyethyl succinic acid, 2-methacryloxyethyl phosphorylcholine (MPC), methyl (meth) acrylate, ethyl (meth) acrylate, and butyl (meth) acrylate.
- alkyl methacrylates such as 2-methacryloyloxyethyl succinic acid, 2-methacryloxyethyl phosphorylcholine (MPC), methyl (meth) acrylate, ethyl (meth) acrylate, and butyl (meth) acrylate.
- examples thereof include amide group-containing monomers such as methoxypolyethylene glycol methacrylate, N-vinylpyrrolidone, N, N-dimethylacrylamide, N, N-diethylacrylamide, N-vinyl-N-methylacetamide and N-vinylacetamide.
- the component (E) is one or more selected from the group consisting of 2-methacryloyloxyethyl phosphorylcholine (MPC), methyl (meth) acrylate, N-vinylpyrrolidone, and N, N-dimethylacrylamide. Is preferable.
- the component (E) may be any one of these monomers or a mixture of two or more.
- the content thereof is 50% by mass or less, 0 to 50% by mass, 0.01 to 50% by mass, 0 based on the total amount of all monomer components in the composition of the present invention. It may be 1 to 50% by mass, 1 to 50% by mass, and 10 to 50% by mass. If it is 50% by mass or less, the effect of the present invention can be obtained in a well-balanced manner.
- the component (F) is a solvent having a hydroxyl group.
- Examples of the component (F) include carboxylic acid and alcohol.
- the component (F) can be blended for the purpose of stabilizing the modulus and shape of the contact lens.
- Specific examples of the component (F) include methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, tert-butanol, 1-pentanol, 2-pentanol, tert-amyl alcohol, 1 -Hexanol, 1-octanol, 1-decanol, 1-dodecanol, glycolic acid, lactic acid, acetic acid and the like can be mentioned.
- the component (F) may be any one of these solvents or a mixture of two or more. From the viewpoint of availability and pH stability, the component (F) is preferably one or more selected from ethanol, 1-propanol, 2-propanol and 1-hexanol.
- the content ratio of the component (F) is 30 parts by mass or less when the total of the components (A) to (E) in the composition is 100 parts by mass. Yes, preferably 20 parts by mass or less. If it is 30 parts by mass or less, the modulus and shape of the contact lens can be maintained in a well-balanced manner.
- the composition of the present invention may contain a cross-linking agent in addition to the above-mentioned components (A) to (F).
- a cross-linking agent for example, ethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, triethylene glycol divinyl ether and the like can be mentioned.
- the cross-linking agent may be any one kind or two or more kinds, but it is preferable to use two or more kinds of cross-linking agents in combination.
- the composition of the present invention contains a cross-linking agent, it is 10 parts by mass or less, preferably 5 parts by mass, when the total of the components (A) to (E) in the composition is 100 parts by mass.
- the composition of the present invention may contain a polymerization initiator in addition to the above-mentioned components (A) to (F) and a cross-linking agent.
- the polymerization initiator may be a known one, and is preferably a thermal polymerization initiator. When a thermal polymerization initiator is used, it is easy to change the copolymerizability of each monomer component due to a temperature change during polymerization. Examples of thermal polymerization initiators are 2,2'-azobisisobutyronitrile, dimethyl 2,2-azobis (2-methylpropionate), 2,2'-azobis [2- (2-imidazolin-).
- peroxide-based polymerization initiators such as cumenehydroperoxide, lauroyl peroxide, t-butylperoxyhexanoate, and 3,5,5-trimethylhexanoyl peroxide. These polymerization initiators may be used alone or in combination of two or more. Of these, azo-based polymerization initiators are preferable in terms of safety and availability, and 2,2'-azobisisobutyronitrile and dimethyl 2,2-azobis (2-methylpropionate) are preferable in terms of reactivity. ), And 2,2'-azobis (2,4-dimethylvaleronitrile) are particularly preferred.
- composition of the present invention contains a polymerization initiator, it is 0.1 to 3 parts by mass, preferably 0, when the total of the components (A) to (E) in the composition is 100 parts by mass. It is 1 to 2 parts by mass, more preferably 0.2 to 1 part by mass. A polymer of the monomer composition of the present invention can be easily obtained in the range of 0.1 to 3 parts by mass.
- the composition of the present invention includes a polymerizable ultraviolet absorber, a polymerizable dye (coloring agent) and the like as long as the object of the present invention is not impaired. May contain the additive of.
- an ultraviolet absorber By blending an ultraviolet absorber, the burden on the eyes due to ultraviolet rays such as sunlight can be reduced. Further, by blending a dye, a color contact lens can be obtained.
- the amount of these additives used depends on the thickness of the contact lens and the like, but usually, when the total of the components (A) to (E) is 100 parts by mass, each of the polymerizable ultraviolet absorber and the polymerizable dye is used.
- the content ratio is preferably 5 parts by mass or less, and more preferably 0.02 to 3 parts by mass.
- the method for producing the composition of the present invention is not particularly limited, and for example, each component is put into a stirring (mixing) device in any order or collectively, and stirred at a temperature of 10 ° C to 50 ° C until uniform. Can be manufactured by mixing). However, when the composition contains a polymerization initiator, care must be taken not to start the polymerization reaction at the time of mixing, and it is preferable to mix at 40 ° C. or lower.
- the polymer of the present invention comprises the polymer of the above-mentioned composition of the present invention.
- the method for producing the polymer of the present invention will be described.
- the production method shown below is only one embodiment of the method for obtaining the polymer, and the polymer of the present invention is not limited to that obtained by the production method.
- the polymer of the present invention can be produced by filling a mold with the composition of the present invention and carrying out a polymerization reaction.
- a mold having a hydrophobic surface made of polypropylene or the like may be used as the mold.
- the polymerization step 1 is a step of adding the above-mentioned polymerization initiator to the composition as needed and polymerizing at a temperature of 45 ° C. to 140 ° C. for 1 hour or more.
- the polymerization temperature in the polymerization step 1 is preferably 50 ° C. to 70 ° C., more preferably 55 ° C. to 70 ° C.
- the polymerization time of the polymerization step 1 is preferably 2 hours or more and 12 hours or less. When the polymerization time of the polymerization step 1 is 1 to 12 hours, a polymer having good physical properties such as modulus can be efficiently obtained.
- the polymerization step 2 is a step of carrying out a polymerization reaction at 90 ° C to 140 ° C. When the polymerization step 1 is not performed, the polymerization step 2 is carried out by adding the above-mentioned polymerization initiator to the composition as needed.
- the polymerization temperature of the polymerization step 2 is preferably 100 ° C. to 120 ° C. When the polymerization temperature in the polymerization step 2 is 90 ° C. to 140 ° C., a polymer having good physical properties such as modulus can be stably obtained, and the polymer can be efficiently obtained without deforming a mold made of polypropylene or the like. be able to.
- the polymerization time of the polymerization step 2 is preferably 1 hour or more and 10 hours or less. When the polymerization time in the polymerization step 2 is 1 to 10 hours, a polymer having good physical properties such as modulus can be efficiently obtained.
- the atmosphere in which the polymerization steps 1 and 2 are carried out is not particularly limited, but it is preferable to carry out both the polymerization steps 1 and 2 in an atmosphere of an inert gas such as nitrogen or argon in terms of improving the polymerization rate.
- the composition may be ventilated with an inert gas, or the composition filling location of the mold may be the atmosphere of the inert gas.
- the pressure in the mold may be atmospheric pressure to slight pressure.
- the gauge pressure is preferably 1 kgf / cm 2 or less.
- the contact lens of the present invention may be a silicone hydrogel contact lens made of the hydrate of the above polymer. That is, the contact lens of the present invention can be obtained by hydrating the polymer of the present invention and water-containing it to form a hydrogel.
- silicone hydrogel means a hydrogel which has a silicone part in a polymer. Since the composition of the present invention contains the components (A) and (B) which are silicone-containing monomers, the polymer thereof has a silicone portion, and a silicone hydrogel can be formed by hydration (water-containing). ..
- the water content of the contact lens (the ratio of water to the total mass of the contact lens) is 35% by mass or more and 60% by mass or less, preferably 35% by mass or more and 50% by mass or less.
- the water content is 35 to 60% by mass, the balance with the physical characteristics of other lenses can be excellent.
- the manufacturing method shown below is only one embodiment of the method for obtaining a contact lens of the present invention, and the contact lens of the present invention is not limited to that obtained by the manufacturing method.
- the polymer may be in a mixed state with an unreacted monomer component (unreacted product), a residue of each component, a by-product, a remaining solvent and the like.
- a polymer for contact lenses is mixed with one or more solvents selected from water, methanol, ethanol, 1-propanol, and 2-propanol. It is preferable to have a step (1) for washing the polymer and a step (2) for immersing the polymer in physiological saline to hydrate it.
- Step (1) is a step of purifying the polymer, and examples of the solvent used include water, methanol, ethanol, 1-propanol, 2-propanol, and a mixture thereof. Purification can be carried out, for example, by immersing the polymer in an alcohol solvent at a temperature of 10 ° C. to 40 ° C. for 10 minutes to 5 hours, then in water for 10 minutes to 5 hours, and the like. Further, it may be immersed in an alcohol solvent, then immersed in a hydrous alcohol having an alcohol concentration of 20 to 50% by weight for 10 minutes to 5 hours, and further immersed in water. As the water, pure water, ion-exchanged water and the like are preferable.
- the polymer washed in the step (1) is immersed in physiological saline and hydrated so as to have a predetermined water content, whereby the contact lens of the present invention can be obtained.
- the physiological saline solution may be boric acid buffered physiological saline solution, phosphate buffered saline solution, or the like. Further, it may be immersed in a preservative solution for soft contact lenses containing physiological saline.
- the osmotic pressure of the physiological saline solution is preferably 250 to 400 mOms / kg in terms of hydration.
- the contact lens of the present invention Since the contact lens of the present invention has appropriate surface hydrophilicity and is excellent in stability, it can be used for about one month in a normal usage mode. That is, the contact lens of the present invention may be replaced at a maximum frequency of one month. Of course, it may be replaced in a shorter period of time.
- ETS which is a compound represented by the component formula (2)
- Sigma which is a compound represented by the formula (3)
- SiGMA 2-hydroxy-3- [bis (trimethylsiloxy) methylsilyl] propylmethacrylate
- TEGDV Triethylene Glycol Divinyl Ether
- TEGDMA Tetraethylene Glycol Dimethacrylate Polymerization Initiator AIBN: 2,2'-Azobis (isobutyronitrile)
- the modulus [MPa] of the contact lens was measured according to JIS-K7127 using a BAS-3305 (W) breaking strength analyzer manufactured by Sanyo Electric Railway Co., Ltd. Specifically, a sample having a width of 2 mm was used, a load cell of 200 gf was used, the clamps were pulled at a speed of 1 mm / sec with a distance of 6 mm, and the modulus was measured.
- Example 1 Under temperature conditions of 25 ° C, 12.5% by weight A-1, 32.4% by weight ETS, 13.8% by weight HBMA, 0.9% by weight MAA, 9.0% by weight MPC, 13.5% by mass NVP, 17.9% by mass MMA and 100 parts by mass of these, 20.0 parts by mass HeOH, 0.8 parts by mass TEGDV, 0.8 parts by mass TEGDMA. The mixture was mixed and uniformly dissolved to obtain a composition. The content ratio of each component is shown in Table 2. 0.5 parts by mass of AIBN was added to the above composition, and a polyethylene terephthalate sheet having a thickness of 0.1 mm was poured into a cell sandwiched between two polypropylene plates as a spacer and placed in an oven.
- Physiological saline was prepared with reference to the literature (ISO 18369-3: 2006, Ophthalmic Optics-Contact Lenses Part 3: Measurement Methods). Weighed 8.3 g of sodium chloride, 5.993 g of sodium hydrogen phosphate dihydrate, and 0.528 g of sodium dihydrogen phosphate dihydrate, dissolved in water to make 1000 mL, and filtered to obtain physiological saline.
- the polymer was immersed in 2-propanol for 4 hours, then in ion-exchanged water for 4 hours, and then in the physiological saline solution described in ISO 18369-3 to prepare a hydrate of the polymer.
- This hydrate was processed into a shape suitable for each evaluation test to obtain a contact lens sample.
- the results of each evaluation are shown in Table 2. Since the modulus was 0.5 MPa, the elongation at break was 260%, and the stability was good, it was confirmed that the contact lens of Example 1 showed good modulus and elongation at break and was excellent in stability.
- Examples 2 to 16 were obtained in the same manner as in Example 1 except that the compositions shown in Tables 2 and 3 were followed.
- Tables 2 and 3 show the results of evaluating modulus, elongation at break, water content and stability in the same manner as in Example 1.
- the modulus was in the range of 0.3 MPa or more and 0.8 MPa or less, and showed good modulus.
- the breaking elongation was 200% or more, showing sufficient breaking elongation.
- the change in water content was within 2%, and it was confirmed that the water content was stable.
- contact lenses of Comparative Examples 1 and 2 were obtained in the same manner as in Example 1 except that the composition shown in Table 4 was followed.
- Comparative Example 1 since the component (C) was not contained, the breaking elongation was less than 200% and the breaking elongation was poor, which was unsuitable as a contact lens.
- Comparative Example 2 since the content ratio of the component (C) was out of the range, the modulus was larger than 0.8 MPa, and the modulus was unsuitable as a contact lens. Therefore, it was confirmed that the polymer obtained by polymerizing the monomer composition of the present invention can produce a contact lens having good modulus, elongation at break and stability.
- the contact lens obtained by polymerizing the monomer composition for contact lenses of the present invention simultaneously satisfies modulus, elongation at break and stability.
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Abstract
Description
(式中、aは20から500の整数を示す。bは1から70の整数を示す。cは1から70の整数を示す。dは0又は1を示す。pとqはそれぞれ0又は1を示す。Xは-CH2-又は-CH2CH2-を表す。Rは炭素数2から18のアルキル基を表す。)
コンタクトレンズの形状安定性についてはコンタクトレンズのモジュラス及び破断伸びが大きく関わる。しかしながら、ポリシロキサンモノマーを使用したコンタクトレンズでは、レンズ表面の表面親水性は十分であり、また安定性の点で良好であるものの、モジュラス及び破断伸びについては改善の余地があった。
なお、「モジュラスに優れる」とは実施例で詳述する機械的強度測定においてモジュラスが0.3MPa以上0.8MPa以下であるものを指す。また「破断伸びに優れる」とは実施例で詳述する機械的強度測定において破断伸びが200%以上であるものを指す。
本発明の他の課題は、上記コンタクトレンズを得るために好適に使用できる組成物及び重合体を提供することである。
(式中、aは20から500の整数を示す。bは1から70の整数を示す。cは1から70の整数を示す。dは0又は1を示す。pとqはそれぞれ0又は1を示す。Xは-CH2-又は-CH2CH2-を表す。Rは炭素数2から18のアルキル基を表す。)
本発明の一形態によれば、(A)下記式(1)で表されるホスホリルコリン基含有ポリシロキサンモノマーと、(B)下記式(2)、または(3)で表される分子内に少なくとも水酸基を1個以上有するシロキサニル基含有シリコーンモノマーと、(C)ヒドロキシエチル(メタ)アクリレート、ヒドロキシプロピル(メタ)アクリレート、ヒドロキシブチル(メタ)アクリレートから選択される1種以上の親水性モノマーと、(D)メタクリル酸と、(E)前記(C)成分以外の親水性モノマーと、を含有する組成物であり、前記組成物中の(A)~(E)成分の合計100質量%に対して、(A)成分の含有割合が10~45質量%であり、(B)成分の含有割合が10~40質量%であり、(C)成分の含有割合が10~30質量%であり、(D)成分の含有割合が0.1~5質量%であり、且つ(E)成分の含有割合が0~50質量%である、コンタクトレンズ用モノマー組成物が提供される。
式1中、aは20から500の整数を示す。bは1から70の整数を示す。cは1から70の整数を示す。dは0又は1を示す。pとqはそれぞれ0又は1を示す。Xは-CH2-又は-CH2CH2-を表す。Rは炭素数2から18のアルキル基を表す。
本発明の更なる形態によれば、上記コンタクトレンズ用重合体の水和物からなるコンタクトレンズ、及びその製造方法が提供される。
1.(A)下記式(1)で表されるホスホリルコリン基含有ポリシロキサンモノマーと、(B)下記式(2)、または(3)で表される分子内に少なくとも水酸基を1個以上有するシロキサニル基含有シリコーンモノマーと、(C)ヒドロキシエチル(メタ)アクリレート、ヒドロキシプロピル(メタ)アクリレート、ヒドロキシブチル(メタ)アクリレートから選択される1種以上の親水性モノマーと、(D)メタクリル酸と、(E)前記(C)成分以外の親水性モノマーと、を含有する組成物であり、前記組成物中の(A)~(E)成分の合計100質量%に対して、(A)成分の含有割合が10~45質量%であり、(B)成分の含有割合が10~40質量%であり、(C)成分の含有割合が10~30質量%であり、(D)成分の含有割合が0.1~5質量%であり、且つ(E)成分の含有割合が0~50質量%である、コンタクトレンズ用モノマー組成物。
式1中、aは20から500の整数を示す。bは1から70の整数を示す。cは1から70の整数を示す。dは0又は1を示す。pとqはそれぞれ0又は1を示す。Xは-CH2-又は-CH2CH2-を表す。Rは炭素数2から18のアルキル基を表す。
2.前記組成物が、さらに(F)水酸基を有する溶媒を含有し、前記組成物中の(A)~(E)成分の合計100質量部に対して、(F)成分の含有割合が30質量部以下である、前項1に記載のコンタクトレンズ用モノマー組成物。
3.前項1又は2に記載のコンタクトレンズ用モノマー組成物の重合体からなる、コンタクトレンズ用重合体。
4.前項3に記載のコンタクトレンズ用重合体の水和物からなる、コンタクトレンズ。
5.前項4に記載のコンタクトレンズのモジュラスが0.3MPa以上0.8MPa以下の範囲内である、コンタクトレンズ。
6.前項4に記載のコンタクトレンズの破断伸びが200%以上である、コンタクトレンズ。
7.前項3に記載のコンタクトレンズ用重合体と、水、メタノール、エタノール、1-プロパノール、および2-プロパノールから選択される1種以上の溶媒とを混合し、前記重合体を洗浄する工程(1)と、前記重合体を生理食塩水に浸漬して水和させる工程(2)と、を有する、コンタクトレンズの製造方法。
本発明のコンタクトレンズ用重合体は、本発明のコンタクトレンズ用モノマー組成物の重合体から得られる。また、本発明のコンタクトレンズは、本発明のコンタクトレンズ用重合体から得られる。加えて、本発明のコンタクトレンズは、本発明のコンタクトレンズ用重合体の水和物であっても良い。以下、本発明のコンタクトレンズ用モノマー組成物を単に組成物と称する。また、本発明のコンタクトレンズ用重合体を単に重合体と称する。
なお、本発明での「モジュラスに優れる」とは、数値は特に限定されないが、好ましくは実施例で詳述する機械的強度測定においてモジュラスが0.3MPa以上0.8MPa以下のものを意味する。また、「破断伸びに優れる」とは、数値は特に限定されないが、好ましくは実施例で詳述する機械的強度測定において破断伸びが200%以上のものを意味する。
式1中、aは20から500の整数を示す。bは1から70の整数を示す。cは1から70の整数を示す。dは0又は1を示す。pとqはそれぞれ0又は1を示す。Xは-CH2-又は-CH2CH2-を表す。Rは炭素数2から18のアルキル基を表す。
Rは炭素数2から18のアルキル基を表し直鎖構造、分岐構造を含み(R=CnHm : n=2~18 m=2n+1)、炭素数3~12のものが好ましく、炭素数3~8のものがより好ましい。例えば、プロピル基、ブチル基、ペンチル基、イソペンチル基、ヘキシル基、イソヘキシル基、オクチル基などを表す。
本発明の組成物において、(A)~(E)成分の合計を100質量%としたとき、(A)成分の含有割合は10~45質量%であり、好ましくは15~35質量%である。10質量%未満ではポリマーの透明性が低下し、45質量%を超えるとポリマーの表面親水性が低下する。
本発明のホスホリルコリン基含有ポリシロキサンモノマーの合成に用いられる式(4)で表されるシリコーン中間体は公知の方法で合成可能である。
下記式(4)で表される両末端水酸基含有シロキサン{例えばGelest社SIB1138.0(式(4)中、p=q=1、n=0)}、SIB1145.0(式(4)中、p=q=n=0)などの末端水酸基含有ジシロキサン、JNC社FM-4411(式(4)中、p=q=1、n=9)などの両末端水酸基含有シリコーン等とメタクリル酸クロライドを、脱塩酸剤共存下で反応させ、式(5)で表される両末端メタクリル基を有する化合物を合成する。脱塩酸剤としては有機アミンを用いることが可能である。好ましくは、トリエチルアミンなどトリアルキルアミン、ジイソプロピルアミンなどのジアルキルアミン、ジアザビシクロウンデセンなどの有機アミンが用いられる。反応時は非プロトン性溶媒を用いることが可能である。溶解性の面からテトラヒドロフランが好ましい。
式(6)で表されるアルキル基含有環状シリコーンは、1,3,5,7-テトラメチルシクロテトラシロキサンと種々の炭素数2から18のアルケン(例:エチレン、プロピレン、ブチレン、ペンチレン、ヘイシレン、2-メチルペンチレン)との付加反応であるヒドロシリル化反応を行うことで合成される。必要であれば吸着処理や分液操作により反応に用いた触媒の除去、減圧により未反応成分の除去をすることが可能である。
次に、式(5)で表される両末端メタクリル基を有する化合物と、オクタメチルシクロテトラシロキサン、1,3,5,7-テトラメチルシクロテトラシロキサン、式(6)で表されるアルキル基含有環状シリコーンとを例えばトリフルオロメタンスルホン酸等の酸触媒を用いて反応させることにより、式(7)で表されるヒドロシリル基含有シリコーン中間体(ヒドロシリル基含有両末端メタクリルシリコーン)を得る。このとき、無溶媒でもよく、クロロホルム等の溶媒を使用することも可能である。
(式中、aは20から500の整数を示す。bは1から70の整数を示す。cは1から70の整数を示す。pとqはそれぞれ0又は1を示す。Rは炭素数2から18のアルキル基を表す。)
a及びbは上記の範囲内であれば特に限定されないが、aは20~500、好ましくは50~300、より好ましくは70~200であり、bは1~70、好ましくは2~40、より好ましくは3~15であり、cは1~70、好ましくは2~40、より好ましくは3~15である。
なお、式(9)の化合物は、アセトニトリル等の非プロトン性溶媒中、式(8)で示されるアルコールと2-クロロ-2-オキソ-1,3,2-ジオキサホスホラン(COP)とを反応させた後、アセトニトリル等の非プロトン性溶媒中でトリメチルアミンを反応させることにより得られる。
式中、dは0または1を示す。ZはCH2=CHCH2-又はCH2=CH-を表す。
(C)成分は、製造されるコンタクトレンズのモジュラス向上に寄与する成分である。
(C)成分としては、具体的には2-ヒドロキシエチル(メタ)アクリレート、2-ヒドロキシプロピル(メタ)アクリレート、4-ヒドロキシブチル(メタ)アクリレート、2-ヒドロキシブチル(メタ)アクリレートなどが挙げられる。
なお、本発明において、「(メタ)アクリレート」は「アクリレート及び/又はメタクリレート」を意味し、「(メタ)アクリル」は「アクリル及び/又はメタクリル」を意味する。
本発明の組成物において、(A)~(E)成分の合計を100質量%としたとき、(C)成分の含有割合は10~30質量%であり、好ましくは15~25質量%である。(C)成分の含有割合が10質量%未満であると、破断伸びが十分でない。一方、30質量%を超えると、モジュラスが高くなりすぎて装用感が悪化する場合がある。
本発明の組成物において、(A)~(E)成分の合計を100質量%としたとき、(D)成分の含有割合は0.1~5質量%であり、好ましくは0.2~2質量%である。(D)成分の含有割合が0.1質量%未満であると、製造されるコンタクトレンズの親水性向上効果が十分に得られない。一方、5質量%を超えると、コンタクトレンズの安定性が低下する。
(E)成分としては、アルキル基の炭素数が1~4のアルキル(メタ)アクリレート、親水性基を有するモノマーなどが挙げられる。ここで親水性基を有するモノマーとは、水酸基、アミノ基、アミド基、カルボキシル基、エーテル基、及びホスホリルコリン基から選択される少なくとも一つの基を有し、かつビニル基、(メタ)アクリロイル基などの重合性不飽和基を有する化合物である。
(E)成分の具体例としては、2-メタクリロイルオキシエチルコハク酸、2-メタクリロイルオキシエチルホスホリルコリン(MPC)、メチル(メタ)アクリレート、エチル(メタ)アクリレート、ブチル(メタ)アクリレートなどのアルキルメタクリレート、メトキシポリエチレングリコールメタクリレート、N-ビニルピロリドン、N,N-ジメチルアクリルアミド、N,N-ジエチルアクリルアミド、N-ビニル-N-メチルアセトアミド及びN-ビニルアセトアミド等のアミド基含有モノマーが挙げられる。これらの中でも、(E)成分は、2-メタクリロイルオキシエチルホスホリルコリン(MPC)、メチル(メタ)アクリレート、N-ビニルピロリドン、及びN,N-ジメチルアクリルアミドからなる群から選択される1種以上であることが好ましい。
(E)成分は、これらのモノマーのいずれか1種類であっても、2種類以上の混合物であってもよい。
(E)成分を含有する場合、その含有量は、本発明の組成物中の全モノマー成分の全量基準で50質量%以下であり、0~50質量%、0.01~50質量%、0.1~50質量%、1~50質量%、10~50質量%であってもよい。50質量%以下であれば、本発明の効果をバランス良く得ることができる。
本発明の組成物が架橋剤を含有する場合、組成物中の(A)~(E)成分の合計を100質量部としたとき、10質量部以下であり、好ましくは5質量部である。
これらの添加剤の使用量はコンタクトレンズの厚さ等に依るが、通常、(A)~(E)成分の合計を100質量部としたとき、重合性紫外線吸収剤及び重合性色素の各々の含有割合は好ましくは5質量部以下であり、より好ましくは0.02~3質量部である。
本発明の組成物をモールドに充填して重合反応を行うことにより、本発明の重合体を製造できる。該モールドとしては、ポリプロピレン等からなる疎水性表面を有するモールドを使用してよい。
重合工程1では、必要に応じて組成物に上記重合開始剤を添加し、45℃~140℃の温度で1時間以上重合を行う工程である。
重合工程1の重合温度は、好ましくは50℃~70℃であり、より好ましくは55℃~70℃である。重合工程1の重合温度が45℃~75℃であれば、物性が良好な重合体を安定して得ることができる。
重合工程1の重合時間は、好ましくは2時間以上、12時間以下である。重合工程1の重合時間が1~12時間であれば、モジュラス等の物性が良好な重合体を効率よく得ることができる。
重合工程2は、90℃~140℃で重合反応を行う工程である。重合工程2は、重合工程1を行わない場合は必要に応じて組成物に上記重合開始剤を添加して行う。
重合工程2の重合温度は、好ましくは100℃~120℃である。重合工程2の重合温度が90℃~140℃であれば、モジュラス等の物性が良好な重合体を安定して得ることができ、ポリプロピレン等からなるモールドを変形させずに重合体を効率よく得ることができる。
重合工程2の重合時間は、好ましくは1時間以上、10時間以下である。重合工程2の重合時間が1~10時間であれば、モジュラス等の物性が良好な重合体を効率よく得ることができる。
モールド内の圧力は大気圧~微加圧でよい。不活性ガス雰囲気中で重合する場合は、ゲージ圧で1kgf/cm2以下とすることが好ましい。
上記重合反応の後、重合体は、未反応のモノマー成分(未反応物)、各成分の残渣、副生成物、残存した溶媒等との混合物の状態にある場合がある。このような混合物をそのまま水和処理に供することも可能であるが、水和処理の前に、精製用溶媒を用いて重合体を精製することが好ましい。
このような観点から、本発明のコンタクトレンズの製造方法は、コンタクトレンズ用重合体と、水、メタノール、エタノール、1-プロパノール、および2-プロパノールから選択される1種以上の溶媒とを混合し、前記重合体を洗浄する工程(1)と、前記重合体を生理食塩水に浸漬して水和させる工程(2)とを有することが好ましい。
工程(2)において、工程(1)で洗浄した重合体を生理食塩水に浸漬し、所定の含水率となるように水和させることによって、本発明のコンタクトレンズが得られる。生理食塩水は、ホウ酸緩衝生理食塩水、リン酸緩衝生理食塩水等であってよい。また、生理食塩水を含有するソフトコンタクトレンズ用保存液に浸漬してもよい。生理食塩水の浸透圧は250~400mOms/kgであることが水和の点で好ましい。
式(2)で表される化合物であるETS、式(3)で表される化合物であるSiGMAを用いた。
ETS:4-(2-ヒドロキシエチル)=1-[3-トリス(トリメチルシロキシ)シリルプロピル]=2-メチリデンスクシネート
SiGMA:2-ヒドロキシ-3-[ビス(トリメチルシロキシ)メチルシリル]プロピルメタクリレート
HEMA:2-ヒドロキシエチルメタクリレート
HPMA:2-ヒドロキシプロピルメタクリレート
HBMA:2-ヒドロキシブチルメタクリレート
(D)成分
MAA:メタクリル酸
MPC:2-(メタクリロイルオキシエチル)-2-(トリメチルアンモニオエチル)ホスフェート
MMA:メタクリル酸メチル
NVP:N-ビニルピロリドン
DMAA:N,N-ジメチルアクリルアミド
(F)成分
HeOH:1-ヘキサノール
TEGDV:トリエチレングリコールジビニルエーテル
TEGDMA:テトラエチレングリコールジメタクリレート
重合開始剤
AIBN:2,2’-アゾビス(イソブチロニトリル)
[コンタクトレンズのモジュラス]
山電社製BAS-3305(W)破断強度解析装置を用い、JIS-K7127に従ってコンタクトレンズのモジュラス[MPa]を測定した。詳しくは、幅2mmのサンプルを使用し、200gfのロードセルを用い、クランプ間6mmとして1mm/秒の速度で引張り、モジュラスを測定した。モジュラスが0.3MPa以上0.4MPa未満又は0.6MPa超0.8MPa以下のときモジュラスが良好(B)であるとし、0.4MPa以上0.6MPa以下のときモジュラスが十分良好(A)であると判断した。
(評価基準)
モジュラス[MPa]
A:0.4以上0.6以下
B:0.3以上0.4未満、又は0.6超0.8以下
C:0.3未満、又は0.8超
山電社製BAS-3305(W)破断強度解析装置を用い、JIS-K7127に従ってコンタクトレンズの破断伸び[%]を測定した。詳しくは、幅2mmのサンプルを使用し、200gfのロードセルを用い、クランプ間6mmとして1mm/秒の速度で引張り、破断伸びを測定した。破断伸びが200%以上300未満の場合を破断伸びが良好(B)とし、破断伸びが300%以上の場合を破断伸びが十分良好(A)と判断した。
(評価基準)
破断伸び[%]
A:300以上
B:200以上300未満
C:200未満
ISO-18369-4に記載の方法で含水率を測定した。
[コンタクトレンズの安定性]
ISO-18369-3に記載の生理食塩水に浸漬させたフィルム状サンプルを60℃恒温槽中で保存し、1か月経過後に上記の含水率測定を行い、初期値との比較により評価した。含水率の変化量が±1%以下のとき安定性が十分良好(A)であるとし、±1~2%以下のとき安定性が良好(B)であると判断した。
25℃の温度条件下で、12.5質量%のA-1、32.4質量%のETS、13.8質量%のHBMA、0.9質量%のMAA、9.0質量%のMPC、13.5質量%のNVP、17.9質量%のMMA及びこれらの合計100質量部に対して、20.0質量部のHeOH、0.8質量部のTEGDV、0.8質量部のTEGDMAを混合し、均一溶解して組成物を得た。各成分の含有割合を表2に示す。
上記組成物に0.5質量部のAIBNを添加し、厚さ0.1mmのポリエチレンテレフタレートシートをスペーサーとして2枚のポリプロピレン板の間に挟みこんだセル内に流し込み、オーブン内へ置いた。オーブン内の窒素置換を行った後、100℃まで昇温し2時間維持して、0kgf/cm2(ゲージ圧)で組成物を重合させて実施例1の重合体を得た。重合体をセルから取り出した。
文献(ISO 18369-3:2006,Ophthalmic Optics-Contact Lenses Part3:Measurement Methods.)を参考に、生理食塩水を調製した。塩化ナトリウム8.3g、リン酸水素ナトリウム十二水和物5.993g、リン酸二水素ナトリウム二水和物0.528gを量り、水に溶かして1000mLとして、ろ過して生理食塩水とした。
上記重合体を2-プロパノールに4時間浸漬した後、イオン交換水に4時間浸漬し、更にISO 18369-3に記載の生理食塩水に浸漬して、上記重合体の水和物を作製した。この水和物を各評価試験に適した形状に加工してコンタクトレンズのサンプルを得た。各評価の結果を表2に示す。モジュラスは0.5MPa、破断伸びは260%、安定性は良好であったことから、実施例1のコンタクトレンズは良好なモジュラス及び破断伸びを示し、かつ安定性に優れていることを確認した。
一方、表4に示す組成に従ったこと以外は実施例1と同様にして比較例1及び2のコンタクトレンズを得た。比較例1では、(C)成分を含有していないため、破断伸びが200%未満となり破断伸びが不良であり、コンタクトレンズとして不適であった。
比較例2では、(C)成分の含有割合が範囲外となっているため、モジュラスが0.8MPaよりも大きな値となり、モジュラスがコンタクトレンズとして不適であった。
よって、本発明のモノマー組成物を重合して得られる重合体は、モジュラス、破断伸び及び安定性が良好なコンタクトレンズを製造できることを確認した。
Claims (5)
- (A)下記式(1)で表されるホスホリルコリン基含有ポリシロキサンモノマーと、
(B)下記式(2)、または(3)で表される分子内に少なくとも水酸基を1個以上有するシロキサニル基含有シリコーンモノマーと、
(C)ヒドロキシエチル(メタ)アクリレート、ヒドロキシプロピル(メタ)アクリレート、ヒドロキシブチル(メタ)アクリレートから選択される1種以上の親水性モノマーと、
(D)メタクリル酸と、
(E)前記(C)成分以外の親水性モノマーと、を含有する組成物であり、
前記組成物中の(A)~(E)成分の合計100質量%に対して、(A)成分の含有割合が10~45質量%であり、(B)成分の含有割合が10~40質量%であり、(C)成分の含有割合が10~30質量%であり、(D)成分の含有割合が0.1~5質量%であり、且つ(E)成分の含有割合が0~50質量%である、コンタクトレンズ用モノマー組成物。
(式中、aは20から500の整数を示す。bは1から70の整数を示す。cは1から70の整数を示す。dは0又は1を示す。pとqはそれぞれ0又は1を示す。Xは-CH2-又は-CH2CH2-を表す。Rは炭素数2から18のアルキル基を表す。)
- 前記組成物が、さらに(F)水酸基を有する溶媒を含有し、前記組成物中の(A)~(E)成分の合計100質量部に対して、(F)成分の含有割合が30質量部以下である、請求項1に記載のコンタクトレンズ用モノマー組成物。
- 請求項1又は2に記載のコンタクトレンズ用モノマー組成物の重合体からなる、コンタクトレンズ用重合体。
- 請求項3に記載のコンタクトレンズ用重合体の水和物からなる、コンタクトレンズ。
- 請求項3に記載のコンタクトレンズ用重合体と、水、メタノール、エタノール、1-プロパノール、および2-プロパノールから選択される1種以上の溶媒とを混合し、前記重合体を洗浄する工程(1)と、
前記重合体を生理食塩水に浸漬して水和させる工程(2)とを有する、コンタクトレンズの製造方法。
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US20200347166A1 (en) * | 2019-05-03 | 2020-11-05 | Johnson & Johnson Surgical Vision, Inc. | High refractive index, high abbe compositions |
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