Mold for Manufacturing Contact Lens, Method for Manufacturing the Same, and Method for Manufacturing Contact Lens Using the Same

Abstract

The present invention relates to a mold for manufacturing contact lenses, a method for manufacturing the same, and a method for manufacturing contact lenses using the same. The present invention forms a lens mold using a mold composition comprising maleic anhydride-grafted polypropylene (PP-g-MAH) and stabilizes the surface by aging it, thereby significantly improving the wettability (hydrophilicity) and adhesion of the mold surface without a separate high-cost plasma treatment process. According to the present invention, the primer and ink layers can be firmly fixed through the activated polar groups on the surface of the mold, thereby increasing the yield of the lens manufacturing process and reducing manufacturing costs, while simultaneously providing a contact lens with excellent optical quality.

Description

Technology Field

[0001] The present invention relates to a contact lens manufacturing technology, and specifically to a lens manufacturing mold comprising polypropylene-graft-Maleic Anhydride (PP-g-MAH) grafted with maleic anhydride (MAH). The present invention is a technology that achieves functionalization of the lens surface and shortens the manufacturing process by activating the surface of the mold without performing a separate plasma treatment or even in a pre-treatment state, thereby chemically fixing and transferring a primer or reactive monomer. Background Technology

[0002] Generally, contact lenses are manufactured using hydrogel or silicone hydrogel-based materials, and a method is widely used in which ink is printed on the surface of a mold, and then a hydrophilic monomer (such as HEMA) is injected and polymerized to encapsulate a color layer inside.

[0003] Polypropylene (PP), which possesses excellent mechanical properties and chemical resistance, is primarily used as a mold for contact lens manufacturing; however, its inherent strong hydrophobicity has limited its use as a lens mold material. Conventionally, to overcome the low surface energy of PP, a pretreatment process was essential in which the surface energy was increased through plasma treatment before applying the primer, rather than applying the primer directly before printing padding. However, the plasma process presents problems such as high equipment and maintenance costs, low process efficiency during mass production, and quality degradation caused by non-uniformity in processing.

[0004] Meanwhile, PBT (Polybutylene Terephthalate) molds, used as an alternative to PP molds, have disadvantages such as difficulty in reproducing fine patterns due to limitations in surface precision, susceptibility to wear and scratches due to low surface hardness, and potential deformation during repeated molding due to insufficient heat resistance. Additionally, issues regarding dimensional stability caused by moisture absorption and a shortened mold lifespan resulting from reduced resistance to chemicals have been pointed out.

[0005] Therefore, a new mold manufacturing technology is required that can improve the activity of the PP surface without separate plasma treatment to secure bonding strength between paints, adhesives, or resin materials. The problem to be solved

[0006] The present invention aims to provide a contact lens and a method for manufacturing the same by utilizing modified polypropylene (modified PP) to secure stable hydrophilicity and optical transparency without separate plasma surface treatment, thereby solving the problem of low surface energy in conventional polypropylene molds. Furthermore, the present invention aims to increase the efficiency of surface activation of the PP mold and transfer of functional groups to the lens surface, enable integration into a mass production line without increasing process time, and simultaneously achieve lens wettability, coating adhesion, and demolding stability. means of solving the problem

[0007] A lens manufacturing method according to the present invention may comprise: (a) injection molding a mold composition comprising polypropylene (PP-g-MAH) grafted with 0.5 to 2.0 weight% maleic anhydride (MAH) to provide a lens mold; (b) aging the molded mold at room temperature to induce the PP-g-MAH component to migrate and rearrange to the mold surface and stabilize the surface component; (c) performing primer coating and ink padding using a carboxyl group (-COOH) formed by rearrangement to the mold surface and hydrolysis by aging in a non-plasma treated state on the surface of the mold, thereby suppressing color spreading of the ink and inducing chemical bonding between the carboxyl group and the ink component; (d) injecting a lens monomer composition into the mold and curing it to form a lens; and (e) demolding the lens from the mold.

[0008] According to one embodiment, the mold composition may comprise 50 to 94 weight% of polypropylene (PP) matrix resin, 5 to 30 weight% of PP-g-MAH, 0.1 to 3 weight% of a polyether-based antistatic agent, and a total of 0.1 to 1 weight% of a phenol-based primary antioxidant and a phosphate-based secondary antioxidant.

[0009] According to another embodiment, the lens mold of step (a) can be injection molded in a mold in which the surface roughness (Ra) of the core is polished to a level of 5 to 50 nm.

[0010] According to one embodiment, the aging of step (b) is performed for 12 to 36 hours at room temperature conditions of 15 to 30°C to induce the PP-g-MAH component to be rearranged onto the mold surface.

[0011] According to another embodiment, the primer coating of step (c) may be performed by applying a primer composition comprising 50 to 85 weight% of HEMA (2-Hydroxyethyl Methacrylate), 5 to 25 weight% of GMMA (Glycerol Monomethacrylate), 1 to 15 weight% of a plastic monomer, 0.1 to 1.0 weight% of an initiator, and 5 to 15 weight% of a humidifier.

[0012] According to one embodiment, the ink padding of step (c) can be printed using an ink composition comprising 15 to 60 weight% of a urethane-curable color polymer, 10 to 40 weight% of a reactive diluent, 0.1 to 5 weight% of a urethane curing agent, and 5 to 40 weight% of a pigment.

[0013] According to another embodiment, the ink padding can complete the urethane polymerization reaction by padding the ink composition, which has a viscosity adjusted to 200 to 400 CPS, and then heating it at a temperature range of 70°C to 130°C for 10 minutes to 2 hours.

[0014] According to one embodiment, the demolding in step (e) can be performed by separating and collecting the upper mold and the lower mold while preventing static electricity by operating an ionizer.

[0015] According to another embodiment, after step (e), the method may further include the step of immersing the separated lens in distilled water or a wetting solution at a temperature of 40°C to 90°C for 1 to 6 hours to hydrate it.

[0016] According to one embodiment, the mold surface of step (c) may have a water contact angle in the range of 80° to 90° according to ASTM D5946 and a T-Peel peel strength with the aluminum interface of 5 N or more.

[0017] A mold for manufacturing a contact lens according to the present invention comprises a polypropylene (PP) matrix resin; and maleic anhydride grafted polypropylene (PP-g-MAH) dispersed within the matrix resin, wherein the maleic anhydride group on the surface is hydrolyzed to form a carboxyl group (-COOH) without plasma treatment being performed on the surface, and the carboxyl group forms a chemical bond with a primer layer or an ink layer to suppress color spreading of the ink, and the water contact angle according to ASTM D5946 may be 90° or less.

[0018] According to one embodiment, the mold may comprise 66 to 94 weight% of PP matrix resin and 5 to 30 weight% of PP-g-MAH modifier.

[0019] According to another embodiment, the PP-g-MAH modifier may have a graft rate of maleic anhydride (MAH) of 0.5 to 2.0 weight%.

[0020] According to one embodiment, the mold may further comprise 0.1 to 3 weight% of a polyether-based antistatic agent and a total of 0.1 to 1 weight% of a phenol-based primary antioxidant and a phosphate-based secondary antioxidant.

[0021] According to another embodiment, when the mold is subjected to Fourier Transform Infrared Spectroscopy (FT-IR) analysis, a peak attributed to the C=O stretching bond of maleic anhydride can be observed.

[0022] According to one embodiment, the surface roughness (Ra) of the surface of the mold in contact with the lens monomer may be at the level of 5 to 50 nm.

[0023] According to another embodiment, the surface of the mold may have a water contact angle in the range of 80° to 90° according to ASTM D5946, and a T-Peel peel strength with the metal interface of 5 N or more.

[0024] The resin composition for manufacturing a contact lens mold according to the present invention comprises 66 to 94 weight% of a polypropylene (PP) matrix resin; and 5 to 30 weight% of maleic anhydride grafted polypropylene (PP-g-MAH) having a maleic anhydride (MAH) graft rate of 0.5 to 2.0 weight%, wherein the PP-g-MAH component is rearranged to the surface through aging after molding, thereby improving the wettability and adhesion of the mold surface without plasma surface treatment.

[0025] According to one embodiment, the resin composition may further comprise 0.1 to 3 weight% of a polyether-based antistatic agent and a total of 0.1 to 1 weight% of a phenol-based primary antioxidant and a phosphate-based secondary antioxidant.

[0026] A contact lens according to the present invention may be provided by transferring a primer coating layer or an ink layer formed by a chemical bonding force with an active site on the surface of the mold to the lens surface.

[0027] According to one embodiment, even though the ink layer is printed on the mold surface without performing a separate plasma treatment, the phenomenon of color spreading caused by the dispersed pigment through chemical bonding with the active carboxyl groups on the mold surface can be suppressed. Effects of the invention

[0028] According to the present invention, by using a mold with modified PP as the main component, the plasma process can be eliminated compared to conventional methods, thereby reducing manufacturing costs and increasing process efficiency. Furthermore, the surface tension of the modified mold improves printing padding properties due to the hydrophilic primer coating, enabling the printing of eye patterns capable of realizing even fine dots, and preventing eye damage caused by dispersed pigments. Moreover, chemical and physical modification using PP-g-MAH improves the wettability, coating adhesion, and surface cleanliness of the lens surface, and reduces the lens defect rate during demolding, thereby increasing productivity. Brief explanation of the drawing

[0029] Figure 1 is a photograph of the contact angle test result of a mold surface according to an experimental example of the present invention. Figure 2 is an FT-IR spectroscopic analysis graph of conventional PP and modified PP (PP-g-MAH) according to an experimental example of the present invention. Figure 3 is a photograph evaluating ink color spreading with and without plasma treatment and with the application of modified PP according to an experimental example of the present invention. Specific details for implementing the invention

[0030] Since the embodiments described in this specification may be modified in various different forms, the technology according to one embodiment is not limited to the embodiments described below. Furthermore, throughout the specification, the terms "comprising," "including," "containing," "containing," or "having" any component do not exclude other components but rather mean that other components may be included, unless specifically stated otherwise. Specifically, modifications including Glycidyl Methacrylate Grafted PP (PP-g-GMA), Acrylic Acid Grafted PP (PP-g-AA), Maleic Acid Grafted PP (PP-g-MA), Hydroxyl-, Amine-, or Acrylate-Grafted PP, as well as unlisted elements, materials, or processes, are not excluded.

[0031] The numerical ranges used in this specification include lower and upper limits and all values ​​within the range, increments logically derived from the form and width of the defined range, all of which are limited values, and all possible combinations of upper and lower limits of numerical ranges limited in different forms.

[0033] <Mold Materials and Molding>

[0034] The mold material of the present invention comprises 66 to 94 weight% of polypropylene (PP) as a matrix resin and 5 to 30 weight% of polypropylene grafted with maleic anhydride (MAH) (PP-g-MAH), optionally further comprising 0.1 to 3 weight% of a polyether-based antistatic agent and a total of 0.1 to 1 weight% of a phenol-based primary antioxidant and a phosphate-based secondary antioxidant. In this case, the MAH content of PP-g-MAH is preferably in the range of 0.5 to 2.0 weight%.

[0035] (1) Role of the antistatic agent: The above-mentioned polyether-based antistatic agent lowers the surface resistance of the mold surface, thereby preventing the adhesion of fine dust in the manufacturing environment. Furthermore, it reduces the electrostatic attraction between the lens and the mold during the demolding process after lens polymerization. This acts as an auxiliary mold release agent to suppress "defects in separation" where the lens tears or sticks to the mold when separated from the mold, thereby improving the yield.

[0036] In addition, primary and secondary antioxidants play a role in controlling gases that may be generated from unreacted materials or monomers within the injected modified PP, thereby improving the injection yield during injection.

[0037] (2) Surface activation mechanism: The principle of mold surface activation according to the present invention is as follows.

[0038] Cyclic anhydride (MAH) structures exposed on the surface of an injection-molded mold undergo a ring-opening reaction upon contact with moisture in the atmosphere or within the primer solution, forming a large amount of highly reactive carboxyl groups (-COOH). These generated carboxyl groups form strong hydrogen bonds or covalent bonds with hydroxyl groups (-OH) or amine groups (-NH2) in the primer layer. Unlike conventional plasma treatment methods that rely on physical roughness, this principle fundamentally improves interfacial adhesion through chemical bonding.

[0039] (3) Importance of the aging process: After molding, aging is performed at room temperature for 12 to 36 hours, preferably 24 hours. Immediately after injection, the polymer chains are in a thermally and mechanically unstable state, but through this aging process, sufficient time can be secured for the polar modifier (PP-g-MAH) dispersed within the PP matrix to migrate to the interface and rearrange to lower the surface energy. Through this, active sites capable of direct chemical bonding with ink and primer components can be formed at a high concentration on the surface.

[0041] Lens Manufacturing Process

[0042] The manufacturing process of a color contact lens according to the present invention consists of the steps of molding a modified mold, primer coating, printing, injection and curing, separation, hydration, and sterilization and packaging, and the specific process conditions for each step are as follows.

[0044] 1. Selection and Mixing of Mold Materials

[0045] (1) Matrix resin: Composite polypropylene (PP) or random PP is used in the range of 66 to 94 weight%.

[0046] (2) Polar modification component: In the present invention, maleic anhydride grafted polypropylene (PP-g-MAH) is most preferably used as the polar modification component to induce activation of the mold surface and secure adhesion. However, the technical concept of the present invention is not limited thereto, and other polar modification agents capable of introducing hydrophilic functional groups to the mold surface, such as acrylic acid grafted PP (PP-g-AA) or PP containing glycidyl methacrylate (GMA) comonomer, maleic acid grafted PP (PP-g-MA), hydroxyl-, amine-, or acrylate-grafted PP, etc., may also be used instead of PP-g-MAH or mixed with such materials and may also be included within the equivalent scope of the present invention.

[0047] When using PP-g-MAH, which is the most preferred embodiment, the specific physical properties and addition conditions are as follows.

[0048] 1) MAH Grafting Rate of Modifier: The PP-g-MAH used in the present invention is characterized by having a maleic anhydride (MAH) content of 0.5 to 2.0 weight% grafted onto the polypropylene main chain.

[0049] If the MAH graft rate is less than 0.5 wt%, even if a large amount of modifier is added to the mold composition, the absolute amount of reactive groups exposed on the surface is insufficient, making it difficult to secure sufficient chemical bonding strength to fix primer or ink without plasma treatment.

[0050] Conversely, if the MAH graft rate exceeds 2.0 wt%, the fluidity (MFR) of the resin may change rapidly due to excessive reactive groups, or micro-bubbles or pinhole defects may occur on the surface of the lens mold due to gas generation during injection molding, and there is a risk that the optical properties of the lens may deteriorate due to the yellowing phenomenon of the resin.

[0051] 2) Dosage of modifier: A polar modification component satisfying the above specifications (MAH 0.5~2.0%) is added in a range of 5~30 weight% relative to the base resin.

[0052] At this time, if the amount of modified component added is less than 5 weight%, the surface activation effect is negligible, and if it exceeds 30 weight%, the rigidity of the mold itself may decrease or transparency may decrease.

[0053] In particular, in order to stably secure sufficient chemical interfacial adhesion (T-Peel strength 5 N or higher) with the ink and primer layers without a separate plasma treatment process, it is more preferable to add it in the range of 8 to 25 weight% as in the examples described below.

[0054] (3) Additives: Optionally, 0.1 to 3 weight percent of a polyether-based antistatic agent is added to suppress static electricity generation during demolding, and a total of 0.1 to 1 weight percent of a phenol-based primary antioxidant and a phosphate-based secondary antioxidant is used to minimize core damage caused by gas release that may occur during injection molding.

[0056] 2. Mold Injection Molding and Aging

[0057] (1) Injection molding is performed in a 12-cavity or 24-cavity mold using the prepared mold composition. At this time, the surface roughness (Ra) of the mold core is polished to a level of 5 to 50 nm to ensure optical smoothness of the lens surface.

[0058] (2) The molded mold is aged at room temperature for 24 hours to induce rearrangement of polymer chains and stabilize surface components.

[0060] 3. Primer Coating

[0061] (1) Before printing padding, a hydrophilic polymer solution is applied to the surface of the front curve mold to form a primer layer.

[0062] (2) Primer composition: A solvent-treated polymer comprising 50-85 wt% of HEMA (2-Hydroxyethyl Methacrylate), 5-25 wt% of GMMA (Glycerol Monomethacrylate), 1-15 wt% of a plastic monomer (MMA or MAA, etc.), 0.1-1.0 wt% of an initiator, and 5-15 wt% of a humidifier (PEG400 or glycerin, etc.) is used.

[0064] 4. Ink Printing and Curing

[0065] (1) Ink composition: Based on 15-60 wt% urethane-curable color polymer, 10-40 wt% reactive diluent, 0.1-5 wt% urethane curing agent, and 0-5 wt% dispersant, and includes 5-30 wt% organic pigment (Carbon Black, Diarylide-based, etc.) or 5-40 wt% inorganic pigment (iron oxide, titanium, etc.) to achieve color.

[0066] (2) Printing and polymerization conditions: After padding printing with ink adjusted to a viscosity of 200 to 400 CPS, the urethane polymerization reaction is completed by heating at a temperature range of 70 to 130°C for 10 minutes to 2 hours.

[0068] 5. Demolding

[0069] The upper mold and lower mold are separated while the ionizer is operated to prevent static electricity, and the polymerized color contact lens is collected.

[0071] 6. Hydration

[0072] The separated lens is immersed in distilled water or a wetting solution (PBS solution, pH 6.8–7.6) at a temperature of 40–90°C and hydrated for 1–6 hours. If necessary, this process is repeated to remove unreacted monomers and swell the lens.

[0074] 7. Sterilization and Packaging

[0075] Lenses that have completed final inspection are immersed in a preservation solution containing 0.01 to 0.1% of a non-ionic surfactant (poloxamer, etc.) to sterilize and package.

[0077] In the following, embodiments of the present invention are further described with reference to specific experimental examples. The embodiments and comparative examples included in the experimental examples are merely illustrative of the present invention and are not intended to limit the appended claims. It is obvious to those skilled in the art that various changes and modifications to the embodiments are possible within the scope and spirit of the present invention, and that such variations and modifications fall within the scope of the appended claims.

[0079] Methods for Measuring Physical Properties

[0080] The physical properties of the mold material and lens mold described in this invention were measured using the following conditions and equipment. The following measurement conditions are intended to ensure the reliability of the data and are applied identically to all examples and comparative examples unless otherwise noted.

[0082] [Measurement of Metal (Al) Interfacial Adhesion Strength (T-Peel)]

[0083] To evaluate the degree of activation of the mold surface, the peel strength with aluminum foil was measured.

[0084] (1) Specimen preparation: The sample was mixed and extruded at 230°C using a twin extruder (L / D: 40, Dia: 31.6 mm), then 3 g of the sample was applied between aluminum foils (thickness 0.1 mm) using a heat press preheated to 250°C and fused for 10 minutes at a pressure of 5 kgf / cm². Afterward, the sample was quenched in cooling water for 20 minutes and cut into strip specimens at intervals of 30 mm.

[0085] (2) Measurement equipment: A universal testing machine (UTM, LLOYD Instruments LR5K PLUS) was used to measure in T-Peel (180-degree peeling) mode.

[0086] (3) Measurement conditions: The tensile speed was set to 50 mm / min and the load cell capacity to 5 kN.

[0087] (4) Derivation of results: The average value of the results measured 3 times per specimen was reported as the adhesive strength (N).

[0089] [Surface Wetness (Water Contact) Measurement]

[0090] A goniometer was used to evaluate the change in hydrophilicity of the mold surface.

[0091] (1) Measurement standard: Measured according to ASTM D5946 standard.

[0092] (2) Measurement method: 3 μL of distilled water was dropped onto the surface of the specimen, and the angle between the droplet and the surface was measured after 5 seconds (see Fig. 1).

[0094] [Mechanical Property Measurement]

[0095] To evaluate the moldability and durability of the mold, each item was measured according to ASTM standard specifications.

[0096] (1) Melt Index (MFR): ASTM D1238 (230℃, 2.16kg load)

[0097] (2) Tensile strength: ASTM D638

[0098] (3) Flexural modulus: ASTM D790

[0099] (4) Impact strength (Izod): ASTM D256 (Notched)

[0101] <Examples and Comparative Examples>

[0102] 1. Manufacture of lens mold [Examples 1 and 2, Comparative Example 1]

[0103] A resin composition for lens molds was prepared by combining polypropylene (PP), which is the base resin, and maleic anhydride graft PP (PP-g-MAH), which is the modifier, according to the composition ratios in [Table 1] below.

[0104] (1) Compounding: The prepared raw materials were fed into a twin-screw extruder and melt-mixed at 230°C to form pellets.

[0105] (2) Injection molding: The manufactured pellets were injected into a mold having a core with a surface roughness (Ra) of 20 nm using an injection molding machine to form a lens mold.

[0106] (3) Aging: The molded mold was aged for 24 hours at room temperature of 25°C to stabilize the surface components. At this time, Comparative Example 1 used ordinary PP without a modifier, and all process conditions were applied identically.

[0108] 2. Evaluation Results

[0109] The manufactured mold and resin composition were evaluated according to the above physical property measurement method, and the results are as follows.

[0110] (1) Evaluation results of adhesive strength and surface wettability

[0111] [Table 1]

[0112]

[0113] As shown in the results of [Table 1] above, Comparative Example 1, which did not contain a modifier, did not adhere to the aluminum substrate at all and exhibited a high contact angle of 98° or higher. On the other hand, Examples 1 and 2 secured excellent interfacial adhesion of 9 N or higher and a low contact angle in the mid-to-late 80° range, confirming that the surface was modified to be suitable for ink and primer coating without separate plasma treatment (refer to the results of the comparison of water contact angles of untreated, plasma-treated, and modified PP in Fig. 1).

[0114] (2) Results of optical and mechanical property evaluation

[0115] [Table 2]

[0116]

[0117] As shown in [Table 2] above, regarding mechanical properties according to the present invention, Examples 1 and 2 showed an impact strength that was improved by more than double (25℃ → 70 J / m) compared to Comparative Example 1, ensuring durability that can suppress mold breakage during demolding, and it was confirmed that they maintained fluidity (MFR) and stiffness (flexural modulus) suitable for molding.

[0118] (3) Evaluation results of spectroscopic changes from FT-IR measurements

[0119] Referring to the attached Fig. 2, the results of comparing the FT-IR spectroscopic characteristics of conventional PP and modified PP (PP-g-MAH) according to the present invention can be seen. A specific peak that was not observed in conventional PP was newly generated in the modified PP, which is attributed to the C=O stretching bond of maleic anhydride. Through this, it was confirmed that the modifying agent was stably grafted onto the PP chain.

[0120] (4) Ink color spreading evaluation results

[0121] Referring to the attached Fig. 3, the results of comparing the color spreading patterns of the ink according to the presence or absence of plasma and the application of modified PP can be seen. When conventional PP was not treated with plasma (Plasma X), severe color spreading occurred, but when plasma was applied (Plasma O) and when the modified PP according to the present invention was applied, no color spreading occurred at all. Through this, it was proven that the modified mold of the present invention has excellent ink fixing power even if the plasma treatment process is completely excluded.

Claims

Claim 1 (a) a step of injection molding a mold composition comprising polypropylene (PP-g-MAH) grafted with 0.5 to 2.0 weight% maleic anhydride (MAH) to provide a lens mold; (b) a step of aging the molded mold at room temperature to induce the PP-g-MAH component to migrate and rearrange to the mold surface and stabilize the surface component; (c) a step of suppressing ink color spreading and inducing chemical bonding between the carboxyl group and the ink component by performing primer coating and ink padding using the carboxyl group (-COOH) formed by rearrangement to the mold surface and hydrolysis by aging in a non-plasma treated state on the surface of the mold; (d) a step of injecting a lens monomer composition into the mold and curing it to form a lens; and (e) a step of demolding the lens from the mold. Claim 2 A method for manufacturing a lens according to claim 1, wherein the mold composition comprises 66 to 94 weight% of a polypropylene (PP) matrix resin, 5 to 30 weight% of PP-g-MAH, 0.1 to 3 weight% of a polyether-based antistatic agent, and a total of 0.1 to 1 weight% of a phenol-based primary antioxidant and a phosphate-based secondary antioxidant. Claim 3 A method for manufacturing a lens according to claim 1, wherein the lens mold of step (a) is injection molded in a mold in which the surface roughness (Ra) of the core is polished to a level of 5 to 50 nm. Claim 4 A lens manufacturing method according to claim 1, wherein the aging of step (b) is performed for 12 to 36 hours at room temperature conditions of 15°C to 30°C to induce the PP-g-MAH component to be rearranged onto the mold surface. Claim 5 A method for manufacturing a lens according to claim 1, wherein the primer coating of step (c) is performed by applying a primer composition comprising 50 to 85 weight% of HEMA (2-Hydroxyethyl Methacrylate), 5 to 25 weight% of GMMA (Glycerol Monomethacrylate), 1 to 15 weight% of a plastic monomer, 0.1 to 1.0 weight% of an initiator, and 5 to 15 weight% of a humidifier. Claim 6 A method for manufacturing a lens according to claim 1, wherein the ink padding of step (c) is printed using an ink composition comprising 15 to 60 weight% of a urethane-curable color polymer, 10 to 40 weight% of a reactive diluent, 0.1 to 5 weight% of a urethane curing agent, and 5 to 40 weight% of a pigment. Claim 7 A lens manufacturing method according to claim 6, characterized in that the ink padding is padded with the ink composition, the viscosity of which is adjusted to 200 to 400 CPS, and then heated for 10 minutes to 2 hours in a temperature range of 70℃ to 130℃ to complete the urethane polymerization reaction. Claim 8 A lens manufacturing method according to claim 1, wherein the demolding step (e) is characterized by separating and collecting the upper mold and the lower mold while preventing static electricity by operating an ionizer. Claim 9 A method for manufacturing a lens according to claim 1, further comprising, after step (e), a step of immersing the separated lens in distilled water or a wetting solution at a temperature of 40°C to 90°C for 1 to 6 hours to hydrate it. Claim 10 A method for manufacturing a lens according to claim 1, wherein the mold surface of step (c) has a water contact angle in the range of 80° to 90° according to ASTM D5946 and a T-Peel peel strength with the aluminum interface of 5 N or more. Claim 11 A mold for manufacturing contact lenses comprising a polypropylene (PP) matrix resin; and maleic anhydride grafted polypropylene (PP-g-MAH) dispersed within the matrix resin, wherein the maleic anhydride groups on the surface are hydrolyzed to form carboxyl groups (-COOH) without plasma treatment being performed on the surface, and wherein the carboxyl groups form a chemical bond with a primer layer or an ink layer to suppress color spreading of the ink, and wherein the water contact angle according to ASTM D5946 is 90° or less. Claim 12 A mold for manufacturing contact lenses according to claim 11, characterized in that the mold comprises 66 to 94 weight% of PP matrix resin and 5 to 30 weight% of PP-g-MAH modifier. Claim 13 A mold for manufacturing contact lenses according to claim 12, characterized in that the PP-g-MAH modifier has a graft rate of maleic anhydride (MAH) of 0.5 to 2.0 weight%. Claim 14 A mold for manufacturing contact lenses according to claim 12, characterized in that the mold further comprises 0.1 to 3 weight% of a polyether-based antistatic agent and a total of 0.1 to 1 weight% of a phenol-based primary antioxidant and a phosphate-based secondary antioxidant. Claim 15 A mold for manufacturing contact lenses according to claim 11, characterized in that a peak attributable to the C=O stretching bond of maleic anhydride is observed during FT-IR (Fourier Transform Infrared Spectroscopy) spectroscopic analysis. Claim 16 A mold for manufacturing contact lenses according to claim 11, characterized in that the surface roughness (Ra) of the surface in contact with the lens monomer is at the level of 5 to 50 nm. Claim 17 A mold for manufacturing contact lenses according to claim 11, characterized in that the surface of the mold has a water contact angle in the range of 80° to 90° according to ASTM D5946 and a T-Peel peel strength with a metal interface of 5 N or more. Claim 18 A resin composition for manufacturing a contact lens mold comprising 66 to 94 weight% of a polypropylene (PP) matrix resin; and 5 to 30 weight% of maleic anhydride grafted polypropylene (PP-g-MAH) having a maleic anhydride (MAH) graft rate of 0.5 to 2.0 weight%, wherein the PP-g-MAH component is rearranged to the surface through aging after molding to improve the wettability and adhesion of the mold surface without plasma surface treatment. Claim 19 A resin composition for manufacturing a contact lens mold according to claim 18, characterized in that the resin composition further comprises 0.1 to 3 weight% of a polyether-based antistatic agent and a total of 0.1 to 1 weight% of a phenol-based primary antioxidant and a phosphate-based secondary antioxidant. Claim 20 A contact lens manufactured by the method of any one of claims 1 to 10, characterized in that a primer coating layer or an ink layer formed by chemical bonding with an active site on the surface of the mold is transferred to the lens surface. Claim 21 A contact lens according to claim 20, characterized in that, even though the ink layer is printed without performing a separate plasma treatment on the mold surface, the color spreading phenomenon caused by the dispersed pigment is suppressed by chemical bonding with the active carboxyl groups on the mold surface.

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