METHOD FOR PREPARING RIGID CORNEAL CONTACT LENSES

Abstract

A method for preparing rigid corneal contact lenses, comprising: designing a lens mold in advance, using a high oxygen permeability siloxane material to react with other polymeric monomers, directly preparing lenses under photocuring or thermocuring processing conditions, and then using the mold to shape in one step. The method can improve the productivity and solve the problems of long processing cycle, low productivity and poor reproducibility of the traditional turning process.

Claims

1. A method for preparing rigid corneal contact lenses, comprising the following steps: A. Mold design and processing: designing lens parameters required for the rigid corneal contact lenses, and using precision lathe to process the mold required for the lenses; B. Preparation of a polymeric material of the rigid corneal contact lenses; pretreating a polysiloxane material as a host material with other monomers or compounds, and the pretreatment comprises mixing, pre-polymerizing or grafting; C. Compression molding of the rigid corneal contact lenses: using the designed mold with the rigid corneal contact lenses product parameters, the required lenses are formed by polymerization reaction under photocuring or thermocuring condition; D. Subsequent processing: a combination of one or more steps in mold opening, cleaning, testing, packaging, and disinfection.

2. The method for preparing the rigid corneal contact lenses of claim 1, wherein the mold materials in step A comprise any one of metal, plastic, glass, crystal.

3. The method for preparing the rigid corneal contact lenses of claim 2, wherein the mold preparing in step A including: first manufacturing metal mold, and then manufacturing into any one of plastic, glass, and crystal by injection molding method.

4. The method for preparing the rigid corneal contact lenses of claim 1, wherein in step B, the siloxane material refers to a class of polymers in which a repeating SiO bond is a main chain, and a silicon atom is directly bonded to an organic group; their oxygen permeability coefficient is greater than 145 10.sup.11 (cm.sup.2/s).

5. The method for preparing the rigid corneal contact lenses of claim 1, wherein the other monomers or compounds in step B refer to a crosslinking agent and an initiator required for the reaction.

6. The method for preparing the rigid corneal contact lenses of claim 5, wherein the crosslinking agent may be one of polyethylene glycol diacrylate, ethylene glycol dimethacrylate and triallyl isocyanurate, or any combination thereof.

7. The method for preparing the rigid corneal contact lenses of claim 5, wherein the initiator may be a photoinitiator or a thermal initiator.

8. The method for preparing the rigid corneal contact lenses of claim 7, wherein the photoinitiator is one of 2-hydroxy-2-methylpropiophenone and benzoin methyl ether, or a combination of two thereof.

9. The method for preparing the rigid corneal contact lenses of claim 7, wherein the thermal initiator is one of azobisisobutyronitrile and benzoyl peroxide, or a combination of two thereof.

10. The method for preparing the rigid corneal contact lenses of claim 1, wherein the subsequent processing further comprises processing performed on the size and appearance of the lenses.

Description

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The embodiments of the present invention are described in detail below, but the present invention may be implemented in various different ways as defined and covered in the following claims.

EXAMPLE 1

[0020] A method for preparing rigid corneal contact lenses, comprising the following steps:

[0021] A. Mold design and processing: designing the lens parameters required for rigid corneal contact lenses, and using precision lathe to process the mold required for the lenses;

[0022] B. Preparation of a polymeric material of rigid corneal contact lenses; pretreating a polysiloxane material as a host material with other monomers or compounds, and the pretreatment comprises mixing, pre-polymerizing or grafting;

[0023] C. Compression molding of rigid corneal contact lenses: using the designed mold with the rigid corneal contact lenses product parameters, the required lenses are formed by polymerization reaction under photocuring or thermocuring condition;

[0024] D. Subsequent processing: a combination of one or more steps in mold opening, cleaning, testing, packaging, and disinfection.

[0025] The mold material of step A is crystal.

[0026] In step B, the siloxane material refers to a class of polymers in which a repeating SiO bond is the main chain and a silicon atom is directly bonded to an organic group, and their oxygen permeability coefficient is greater than 14510.sup.11 (cm.sup.2/s) [mLO.sup.2/(mLhPA)].

[0027] The other monomers or compounds in step B refer to a crosslinking agent and an initiator required for the reaction.

[0028] The crosslinking agent is polyethylene glycol diacrylate.

[0029] The initiator is a photoinitiator, and the photoinitiator is 2-hydroxy-2-methylpropiophenone.

[0030] The subsequent processing further comprises processing that may be performed on the size and appearance of the lenses.

EXAMPLE 2

[0031] A method for preparing rigid corneal contact lenses, comprising the following steps:

[0032] A. Mold design and processing: designing the lens parameters required for rigid corneal contact lenses, and using precision lathe to process the mold required for the lenses;

[0033] B. Preparation of a polymeric material of rigid corneal contact lenses; pretreating a polysiloxane material as a host material with other monomers or compounds, and the pretreatment comprises mixing, pre-polymerizing or grafting;

[0034] C. Compression molding of rigid corneal contact lenses: using the designed mold with the rigid corneal contact lenses product parameters, the required lenses are formed by polymerization reaction under photocuring or thermocuring condition;

[0035] D. Subsequent processing: a combination of one or more steps in mold opening, cleaning, testing, packaging, and disinfection.

[0036] The mold material in step A is PP plastic, and the metal mold is processed first, and the plastic mold is produced by injection molding method.

[0037] In step B, the siloxane high oxygen permeability material refers to a class of polymers in which a repeating SiO bond is the main chain and a silicon atom is directly bonded to an organic group, and their oxygen permeability coefficient is greater than 14510.sup.31 11 (cm.sup.2/s) [mLO.sup.2/(mLhPa)].

[0038] The other monomers or compounds in step B refer to a crosslinking agent and an initiator required for the reaction.

[0039] The crosslinking agent may be a combination of ethylene glycol dimethacrylate and polyethylene glycol diacrylate.

[0040] The initiator is a photoinitiator, and the photoinitiator is benzoin methyl ether.

[0041] The subsequent processing further comprises processing that may be performed on the size and appearance of the lenses.

EXAMPLE 3

[0042] A method for preparing rigid corneal contact lenses, comprising the following steps:

[0043] A. Mold design and processing: designing the lens parameters required for rigid corneal contact lenses, and using precision lathe to process the mold required for the lenses;

[0044] B. Preparation of a polymeric material of rigid corneal contact lenses; pretreating a polysiloxane material as a host material with other monomers or compounds, and the pretreatment comprises in mixing, pre-polymerizing or grafting;

[0045] C. Compression molding of rigid corneal contact lenses: using the designed mold with the rigid corneal contact lenses product parameters, the required lenses are formed by polymerization reaction under photocuring or thermocuring condition;

[0046] D. Subsequent processing: a combination of one or more steps in mold opening, cleaning, testing, packaging, and disinfection.

[0047] The mold material in step A is PBT plastic, the metal mold is processed first, and the mold is produced by injection molding method.

[0048] In step B, the siloxane high oxygen permeability material refers to a class of polymers in which a repeating SiO bond is the main chain and a silicon atom is directly bonded to an organic group, and their oxygen permeability coefficient is greater than 14510.sup.11 (cm.sup.2/s) [mLO.sup.2/(mLhPa)].

[0049] The other monomers or compounds in step B refer to a crosslinking agent and an initiator required for the reaction.

[0050] The crosslinking agent may be polyethylene glycol diacrylate and isocyanuric acid triallyl ester.

[0051] The initiator is a thermal initiator; the thermal initiator is azobisisobutyronitrile.

[0052] The subsequent processing further comprises processing that may be performed on the size and appearance of the lenses.

[0053] The description above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and alterations of the present invention are readily recognized by those skilled in the art. Any modifications, equivalent substitutions, improvements and the like made within the spirit and scope of the present invention are within the scope of the present invention.