CN-121975067-A - Contact lens and preparation method thereof

Abstract

The invention provides a contact lens and a preparation method thereof, belonging to the field of contact lenses. The invention provides a contact lens which comprises, by mass, 70-98.8% of a hydroxy methacrylate monomer, 0-25% of an acrylic monomer, 0.9-20% of polyether modified silicone oil, 0.05-5% of a cross-linking agent and 0.05-5% of an initiator, wherein the contact lens is prepared from raw materials containing no pigment. The invention forms light aggregation or phase distribution difference in the system by polyether silicone oil, so that the central optical area of the lens is transparent, the edge is white or semitransparent, and the natural optical concealing effect or iris enhancement effect is obtained without pigment.

Inventors

• WANG YUDONG
• LIU HANYU
• CHEN PING

Assignees

• 海昌隐形眼镜有限公司
• 江苏海伦隐形眼镜有限公司

Dates

Publication Date

20260505

Application Date

20260306

Claims (10)

1. 1. The contact lens is characterized by comprising the following preparation raw materials in percentage by mass: 70-98.8% of methacrylic acid hydroxy ester monomer; 0-25% of an acrylic monomer; 0.9-20% of polyether modified silicone oil; 0.05-5% of a cross-linking agent; 0.05-5% of an initiator; The raw materials for preparing the contact lens do not contain pigment.
2. 2. The contact lens of claim 1, wherein the hydroxy methacrylate monomer comprises one or more of 2-hydroxyethyl methacrylate, hydroxybutyl methacrylate, hydroxypropyl methacrylate, and dihydroxypropyl methacrylate.
3. 3. The contact lens of claim 1, wherein the acrylic monomer comprises one or more of acrylic acid, methacrylic acid, methacryloylglycine, and hydroxy betaine methacrylate.
4. 4. The contact lens of claim 1, wherein the polyether segment molecular weight in the polyether modified silicone oil is 100-6000 and the polysiloxane segment molecular weight is 100-1000.
5. 5. The contact lens of claim 1, wherein the polyether segment molecular weight of the polyether modified silicone oil is 200-4500 and the polysiloxane segment molecular weight is 200-500.
6. 6. The contact lens of claim 1, wherein the crosslinking agent comprises one or more of ethylene glycol dimethacrylate, triethylene glycol methacrylate, tetraethylene glycol dimethacrylate, and polyethylene glycol dimethacrylate.
7. 7. The contact lens of claim 1, wherein the initiator comprises one or more of azobisisobutyronitrile, azobisisoheptonitrile, benzoyl peroxide, and lauroyl peroxide.
8. 8. The method for producing a contact lens according to any one of claims 1 to 7, comprising the steps of: Mixing the raw materials for preparing the contact lens, standing the obtained mixture, curing, and hydrating the obtained product to obtain the contact lens.
9. 9. The preparation method according to claim 8, wherein the standing temperature is 4-60 ℃ for 1-30 hours, and the curing temperature is 70-120 ℃ for 1-15 hours.
10. 10. The method of claim 8, wherein the hydration time is 1 to 5 hours.

Description

Contact lens and preparation method thereof Technical Field The invention relates to the field of contact lenses, in particular to a contact lens and a preparation method thereof. Background Currently commercially available colored or concealer contact lenses generally employ pigment printing techniques to achieve iris magnification and aesthetics by printing a color ring or colored layer on the lens substrate. However, existing pigment-printed lenses present a risk of pigment migration-the printed colorant may migrate to the corneal side during extended wear, presenting a biocompatibility hazard. Disclosure of Invention The invention provides a contact lens and a preparation method thereof, and the contact lens avoids the risk of pigment migration. The invention provides a contact lens, which comprises the following preparation raw materials in percentage by mass: 70-98.8% of methacrylic acid hydroxy ester monomer; 0-25% of an acrylic monomer; 0.9-20% of polyether modified silicone oil; 0.05-5% of a cross-linking agent; 0.05-5% of an initiator; The raw materials for preparing the contact lens do not contain pigment. Preferably, the hydroxy methacrylate monomers include one or more of 2-hydroxyethyl methacrylate, hydroxybutyl methacrylate, hydroxypropyl methacrylate, and dihydroxypropyl methacrylate. Preferably, the acrylic monomer includes one or more of acrylic acid, methacrylic acid, methacryloylglycine and hydroxy betaine methacrylate. Preferably, the molecular weight of a polyether chain segment in the polyether modified silicone oil is 100-6000, and the molecular weight of a polysiloxane chain segment is 100-1000. Preferably, the molecular weight of a polyether chain segment in the polyether modified silicone oil is 200-4500, and the molecular weight of a polysiloxane chain segment is 200-500. Preferably, the crosslinking agent includes one or more of ethylene glycol dimethacrylate, triethylene glycol methacrylate, tetraethylene glycol dimethacrylate and polyethylene glycol dimethacrylate. Preferably, the initiator comprises one or more of azobisisobutyronitrile, azobisisoheptonitrile, benzoyl peroxide and lauroyl peroxide. The invention also provides a preparation method of the contact lens, which comprises the following steps: Mixing the raw materials for preparing the contact lens, standing the obtained mixture, curing, and hydrating the obtained product to obtain the contact lens. Preferably, the standing temperature is 4-60 ℃ for 1-30 hours, and the curing temperature is 70-120 ℃ for 1-15 hours. 10. Preferably, the hydration time is 1-5 hours. According to the invention, the polyether silicone oil can form a phase separation structure in the system, so that the light scattering of the edge area is enhanced, the central area is more compact and transparent due to the concentrated polymerization environment and light path, and therefore, the central optical area of the lens is transparent, the edge is in a white or semitransparent state, and a natural optical concealing effect or an iris enhancement effect is obtained under the condition of no pigment. The preparation method has the advantages of avoiding the hidden danger of biocompatibility caused by pigment migration, along with simple process, and being capable of directly forming a concealing structure in single polymerization. According to the invention, the edge whitening degree can be regulated and controlled through the proportion of the polyether silicone oil, so that different concealing effects can be realized. Drawings FIG. 1 is a lens prepared in example 1; FIG. 2 is a lens prepared in example 2; FIG. 3 is a lens prepared in example 3; FIG. 4 is a lens prepared in example 4; FIG. 5 is a lens prepared in example 5; FIG. 6 is a lens prepared in example 6; FIG. 7 is a lens prepared in comparative example 1; fig. 8 is a lens prepared in comparative example 2. Detailed Description The invention provides a contact lens, which comprises the following preparation raw materials in percentage by mass: 70-98.8% of methacrylic acid hydroxy ester monomer; 0-25% of an acrylic monomer; 0.9-20% of polyether modified silicone oil; 0.05-5% of a cross-linking agent; 0.05-5% of an initiator; The raw materials for preparing the contact lens do not contain pigment. The contact lens comprises 70-98.8% of hydroxy methacrylate monomers, which can be 72%, 75%, 78%, 80%, 85%, 88%, 90%, 92%, 95% or 98% in specific embodiments of the invention, wherein the hydroxy methacrylate monomers preferably comprise one or more of 2-hydroxyethyl methacrylate, hydroxybutyl methacrylate, hydroxypropyl methacrylate and dihydroxypropyl methacrylate. The contact lens comprises, by mass, 0-25% of acrylic monomers, which in specific embodiments can be 1%, 2%, 5%, 10%, 15%, 18% or 20%, wherein the acrylic monomers preferably comprise one or more of acrylic acid, methacrylic acid, methacryloylglycine and hydroxy betaine methacrylate. The preparation raw materials of the contact lens