Manufacturing method for improving color saturation of patterns of contact lenses

Abstract

The invention provides a manufacturing method for improving color saturation of patterns of contact lenses, and relates to the technical field of preparation of ink for contact lenses, the method comprises the following steps: mixing selected single pigment toner with HEMA monomer, and stirring to uniformly disperse the pigment toner; when the single pigment toner is mixed with the HEMA monomer, a reaction initiator is added, a polymerization reaction is carried out, and toner particles are coated in a polymer network through stirring to form paste; a three-roller mixer is used for rolling and dispersing the paste, so that toner particles are uniformly dispersed, and prefabricated color paste with a single color is obtained; and mixing the treated single-color color paste according to a color matching ratio to form the transfer printing ink. According to the method, pigment toner particles and HEMA monomers are mixed, and the toner particles are uniformly distributed in the ink through the processes of stirring, three-roller rolling and the like, so that the color paste is formed, the color saturation is effectively improved, and the risk of color shedding is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of contact lens ink preparation, and in particular to a method for improving the color saturation of contact lens patterns. Background Art

[0002] Contact lenses are an important tool for vision correction. In recent years, as people's demand for beauty has increased, the market demand for colored contact lenses (also known as beauty lenses) has grown significantly. Colored contact lenses make the wearer's eyes brighter and more personalized by printing various patterns on the lenses. These patterns are usually printed on the surface or inside of the contact lenses to create different visual effects.

[0003] In practical applications, the color patterns of contact lenses must not only have rich color saturation, but also maintain the stability of the patterns during daily use, that is, the patterns should not fade or discolor due to external rubbing, cleaning and other operations during use. Traditional contact lens pattern printing technology mostly uses a sandwich structure process, that is, the ink layer is sandwiched between two layers of lens material to prevent the pattern from directly contacting the surface of the eyeball or the external environment. However, although this process can protect the pattern to a certain extent, it also has some limitations.

[0004] First, in order to improve the color saturation of the contact lens pattern, the visual effect of the color is usually enhanced by increasing the amount of ink transferred. However, due to the increase in the amount of ink, the protective layer on the surface of the pattern may not be able to completely cover the ink layer, especially when the first protective layer is thin. This incomplete coverage can easily expose the ink, thereby increasing the risk of pattern fading.

[0005] Secondly, in actual operation, the toner particles in the ink may aggregate to form larger particles due to the electrostatic effect, resulting in uneven adhesion of the ink on the lens surface, thus affecting the overall color performance of the pattern. This phenomenon not only reduces the color saturation of the pattern, but may also cause some areas of the pattern to be easily worn or faded during wear.

[0006] In order to overcome the above problems, improve the color saturation of contact lens patterns, and ensure the stability and safety of patterns in daily use, the prior art has proposed a variety of improvement schemes. For example, attempts are made to use ink materials with high adhesion, or to increase the color depth of patterns by multiple printing and superposition. However, these methods still have certain limitations, such as the adhesion of ink is not stable enough, or multiple printings may cause blurred edges of patterns.

[0007] Therefore, how to improve the color saturation of contact lens patterns while ensuring the wear resistance and stability of the patterns during use has become an urgent problem to be solved in the current technical field. Summary of the invention

[0008] In view of this, in order to improve the color saturation of contact lens patterns and ensure their wear resistance and color stability during use, the present invention proposes a production method for improving the color saturation of contact lens patterns through ink preparation, and adopts high-purity color coating dispersion technology (Color Shield Saturation Vision, S-Vision) to mix pigment toner particles with HEMA monomers. Through stirring and three-roller rolling and other processes, the toner particles are evenly distributed in the ink to form a color paste, which effectively improves the color saturation and reduces the risk of color shedding.

[0009] The present invention is implemented by the following technical solutions: In a first aspect, the present invention provides a method for improving the color saturation of contact lens patterns, the method comprising the following steps: a. Mix the selected single pigment powder with HEMA monomer and stir to make the pigment powder evenly dispersed; b. When a single pigment toner is mixed with a HEMA monomer, a reaction initiator is added to carry out a polymerization reaction, and the toner particles are coated in a polymer network to form a paste by stirring; c. Use a three-roller mixer to roll and disperse the paste to evenly disperse the color powder particles to obtain a single color prefabricated color paste; d. Mix the processed single color paste according to the color matching ratio to form transfer ink.

[0010] As a further embodiment of the present invention, the pigment toner is composed of powdered particles of iron oxide, titanium dioxide (TiO2), carbon black or mica.

[0011] As a further embodiment of the present invention, the HEMA monomer is a hydrogel material for contact lenses. The HEMA monomer is hydroxyethyl methacrylate, which is soluble in organic solvents and water, and aggregates itself to form a solid phase of poly (2-hydroxyethyl methacrylate) (pHEMA), which has good biocompatibility and reactivity.

[0012] As a further embodiment of the present invention, when a single pigment toner is mixed with HEMA monomer, it is stirred manually or mechanically until the toner particles are evenly dispersed and the viscosity range is controlled between 50 cP and 40000 cP.

[0013] As a further embodiment of the present invention, the reaction initiator is a thermal initiator or a photoinitiator.

[0014] As a further embodiment of the present invention, the reaction initiator is an azo initiator or a photosensitive initiator.

[0015] As a further solution of the present invention, when a three-roller mixer is used to roll and disperse the paste, the three-roller mixer is used to roll and disperse the paste, and the particle size distribution of the processed color paste is controlled to be <5 μm.

[0016] As a further solution of the present invention, gold and silver powder or pearl powder is added during the preparation of the transfer ink. The processed single-color paste is mixed according to the CMYK color matching ratio, and gold and silver powder or pearl powder is added to prepare the transfer ink to enhance the brightness and visual effect of the pattern.

[0017] As a further solution of the present invention, the solution components in the transfer ink include: HEMA or silicone hydrogel monomer, hydrophilic monomer, initiator and cross-linking agent.

[0018] As a further embodiment of the present invention, the solution components in the transfer ink include: 50% to 90% HEMA and / or silicone hydrogel monomers; 5% to 10% of a hydrophilic monomer, wherein the hydrophilic monomer is one or more of NVP, MAA, MPC, glycerol, PEG, PVP, and PMPC; 0.1% to 5% of an initiator, wherein the initiator is an azo initiator or a photosensitive initiator; 0.1% to 5% of a cross-linking agent, wherein the cross-linking agent is EGDMA, DEGDMA or TEGDMA; 0.1% to 40% of an organic solvent, wherein the organic solvent is one or more of aromatic hydrocarbons, aliphatic hydrocarbons, alicyclic hydrocarbons, halogenated hydrocarbons, alcohols, ethers, esters, ketones or diol derivatives.

[0019] The present invention provides a new manufacturing method for improving the color saturation of contact lens patterns, improves the color shedding problem caused by incomplete coverage of the protective layer in the traditional process, and at the same time ensures the safety and aesthetics of the contact lenses.

[0020] A contact lens prepared by the manufacturing method, wherein the pattern of the contact lens has high color saturation and maintains color stability and wear resistance during use.

[0021] Compared with the prior art, the method for improving the color saturation of contact lens patterns provided by the present invention has the following beneficial effects: 1. Improved color saturation: The present invention significantly improves the color saturation of contact lens patterns through pretreatment of pigment toner and preparation of ink. In traditional processes, toner particles are easily aggregated due to electrostatic effects, resulting in uneven pattern color and insufficient saturation. The present invention controls the size and distribution of toner particles to ensure their uniform dispersion in the solution, and combines appropriate viscosity control to make the ink adhere more evenly to the lens, ultimately making the color of the pattern more vivid and saturated.

[0022] 2. Enhanced pattern durability: In the process of preparing the ink, the present invention uses a three-roller mixer for rolling and dispersion, and the toner particles are evenly coated in the polymer network, effectively preventing the toner particles from being exposed to the external environment. This structural design improves the wear resistance of the pattern, so that the pattern can remain stable and not fade even after washing, rubbing, etc. during the use of the contact lens, thereby extending the service life of the product.

[0023] 3. Optimized production process: The manufacturing method of the present invention ensures the controllability and repeatability of the contact lens pattern manufacturing process through process flow and material selection. By optimizing the configuration of the solution components in the ink (such as the reasonable ratio of HEMA or silicone hydrogel monomer, hydrophilic monomer, initiator, cross-linking agent and organic solvent), the reactivity and stability of the ink are ensured, while the wettability and wearing comfort of the contact lens are improved. This process not only simplifies the production process, but also improves production efficiency and reduces production costs.

[0024] 4. Realizes diversified visual effects: The present invention can also produce patterns with special gloss and brightness by adding special ingredients such as gold and silver powder and pearl powder to the ink, thereby enhancing the aesthetics and market competitiveness of contact lenses. Consumers can choose contact lenses with different visual effects according to their personal preferences, meeting diversified market demands.

[0025] 5. Improved safety: The process design of the present invention focuses on the safety of contact lenses, especially in the selection and processing of toner and ink, using non-toxic and harmless materials, and ensuring that the toner particles are completely coated in the polymer to avoid the risk of direct contact with the eyeball. In addition, by strictly controlling the proportion of organic solvents in the ink, the present invention also ensures the biocompatibility and safety of contact lenses during wearing. The pigment toner and organic solvent used will not pollute the environment during production and use, and the optimized production process reduces the generation of waste, meeting the requirements of modern green production.

[0026] In summary, the manufacturing method for improving the color saturation of contact lens patterns of the present invention not only effectively improves the color saturation and durability of the contact lens patterns, but also significantly improves the overall quality and market competitiveness of the contact lenses by optimizing the process flow, enriching the visual effects and enhancing product safety.

[0027] These and other aspects of the present invention will be more clearly understood in the following description of the embodiments. It should be understood that the above general description and the following detailed description are only exemplary and explanatory and cannot limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following briefly introduces the drawings required for use in the exemplary embodiments or related technical descriptions. The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings: Figure 1 The present invention is a flowchart of a method for improving the color saturation of contact lens patterns according to an embodiment of the present invention.

[0029] Figure 2 It is a schematic diagram of preparing color paste particles by mixing color powder particles and solvent in the method for improving the color saturation of contact lens patterns according to an embodiment of the present invention.

[0030] Figure 3 It is a schematic diagram of ink coated on a lens protective layer in a method for improving the color saturation of contact lens patterns according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] In some of the processes described in the specification and claims of the present invention and the above-mentioned figures, multiple operations that appear in a specific order are included, but it should be clearly understood that these operations may not be executed in the order in which they appear in this article or executed in parallel. The serial numbers of the operations, such as 101, 102, etc., are only used to distinguish different operations, and the serial numbers themselves do not represent any execution order. In addition, these processes may include more or fewer operations, and these operations may be executed in sequence or in parallel. It should be noted that the descriptions of "first", "second", etc. in this article are used to distinguish different messages, devices, modules, etc., do not represent the order of precedence, and do not limit the "first" and "second" to be different types.

[0033] The following will be combined with the drawings in the exemplary embodiments of the present invention to clearly and completely describe the technical solutions in the exemplary embodiments of the present invention. Obviously, the exemplary embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0034] The traditional method is to increase the transfer amount of ink and use a sandwich structure to wrap the ink layer to prevent the pattern from fading. However, this method often causes uneven ink adhesion, resulting in the protective layer not being able to completely cover the ink, which leads to the risk of color fading, affecting the appearance and service life of the contact lens.

[0035] In order to improve the color saturation of contact lens patterns while ensuring their durability and safety, the present invention proposes a method for improving color saturation through a specific ink preparation method. The present invention uses a mixture of pigment toner particles and HEMA monomers, and through stirring and three-roller rolling processes, the toner particles are evenly distributed in the ink to form a color paste, which effectively improves color saturation and reduces the risk of color shedding.

[0036] The technical solution of the present invention is further described below in conjunction with specific embodiments: See also Figure 1 As shown, Figure 1 A flowchart of a method for improving the color saturation of contact lens patterns provided by the present invention. A method for improving the color saturation of contact lens patterns provided in one embodiment of the present invention comprises the following steps: Step S10. Mixing the selected single pigment toner with the HEMA monomer, and stirring to make the pigment toner evenly dispersed; Step S20. When the single pigment toner is mixed with the HEMA monomer, a reaction initiator is added to carry out a polymerization reaction, and the toner particles are coated in the polymer network to form a paste by stirring; Step S30: using a three-roller mixer to crush and disperse the paste so that the color powder particles are evenly dispersed to obtain a prefabricated color paste of a single color; Step S40: Mix the processed single color pastes according to the color matching ratio to form transfer ink.

[0037] The embodiment of the present invention provides a manufacturing method for improving the color saturation of contact lens patterns through ink formulation, which significantly improves the color saturation of contact lens patterns, increases the surface area of ​​color powder particles by 1.5 times, enhances the brightness and saturation effects of colors, and uses ink treated with color paste to have uniform particle size, thereby avoiding the risks of color powder exposure and color shedding. The three-roller rolling process ensures that the color powder particles are evenly dispersed, thereby improving the adhesion performance of the ink and the durability of the contact lenses.

[0038] In this embodiment, during the pretreatment of the toner, a pigment toner with good dispersibility and stability is selected, and the ingredients may include iron oxide, titanium dioxide (TiO2), carbon black, mica, etc. Since the toner particles are easily aggregated in the solution due to the electrostatic effect, the toner needs to be evenly dispersed through the pretreatment step. The selected single pigment toner is mixed with the HEMA monomer using the high-purity color coating dispersion technology (ColorShield Saturation Vision, S-Vision), and stirred to evenly disperse the pigment toner.

[0039] In the ink preparation stage, the selected pigment toner is mixed with HEMA monomer, wherein HEMA monomer is a hydrogel material commonly used in contact lenses, and has good biocompatibility and reactivity. In this embodiment, the HEMA monomer is hydroxyethyl methacrylate, which is soluble in organic solvents and water, and aggregates itself to form a solid phase of poly (2-hydroxyethyl methacrylate) (pHEMA), which has good biocompatibility and reactivity.

[0040] When mixing the single pigment toner with the HEMA monomer, stir manually or mechanically until the toner particles are evenly dispersed, and the viscosity range is controlled between 50cP and 40000cP. Then add the reaction initiator, wherein the reaction initiator is a thermal initiator or a photoinitiator, such as an azo initiator or a photosensitive initiator, to ensure the smooth progress of the polymerization reaction.

[0041] Then, in the formation stage of the color paste, the mixture is crushed and dispersed by a three-drum mixer to break the aggregation of color powder particles caused by electrostatic adsorption and further disperse the color powder evenly. This process wraps the color powder particles in a cross-linked network structure to form a paste. The particle size distribution of the treated color paste is controlled to <5μm, which significantly increases the surface area of ​​the ink.

[0042] When mixing multiple colors of pre-made color pastes, the processed single-color pastes can be mixed according to the CMYK color matching ratio as needed. Gold, silver or pearl powder can also be added in the preparation process of printing ink. The processed single-color pastes can be mixed according to the CMYK color matching ratio, and gold, silver or pearl powder can be added to prepare transfer ink to enhance the brightness and visual effect of the pattern.

[0043] The solution components in the transfer ink include: HEMA or silicone hydrogel monomer, hydrophilic monomer, initiator and crosslinker. 50% to 90% HEMA or / and silicone hydrogel monomer; the silicone hydrogel monomer is one or more of PDMS (polydimethylsiloxane), SiGMA [3-methacryloyloxy-2-hydroxypropoxy)propylbis(trimethylsiloxy)methylsilane)] or Tris [3-methacrylic acid propyltris(trimethoxysilane)]; 5% to 10% of a hydrophilic monomer, wherein the hydrophilic monomer is one or more of NVP, MAA, MPC, glycerol, PEG, PVP, and PMPC; 0.1% to 5% of an initiator, wherein the initiator is an azo initiator or a photosensitive initiator; 0.1% to 5% of a cross-linking agent, wherein the cross-linking agent is EGDMA, DEGDMA or TEGDMA; 0.1% to 40% of an organic solvent, wherein the organic solvent is one or more of aromatic hydrocarbons, aliphatic hydrocarbons, alicyclic hydrocarbons, halogenated hydrocarbons, alcohols, ethers, esters, ketones or diol derivatives.

[0044] Among them, the hydrophilic monomer helps to enhance the wetting performance of the contact lens, and the initiator and cross-linking agent are used to control the occurrence of polymerization and the formation of the network structure of the ink layer. After the ink treated with the color paste is transferred, the color powder particles are more evenly distributed, avoiding the exposure of the color powder, and enhancing the color saturation and wear resistance of the contact lens pattern.

[0045] Since the ink without color paste treatment has a larger particle size distribution (5-10um), and the surface cannot be evenly coated with materials, it cannot be evenly wrapped in the solvent after transfer, causing the risk of color powder particles falling off in subsequent use. After using color paste treatment, the particle size distribution can be <5um, and at the same weight ratio, the surface area can be increased by 1.5 times (7.5um is estimated for untreated), and the risk of toner particles being exposed and uncoated is avoided.

[0046] See also Figure 2 and Figure 3As shown, in the method for improving the color saturation of contact lens patterns according to an embodiment of the present invention, the characteristic of pigment toner particles 1 that can be dispersed in a solvent 2 is utilized, and the single color toner particles 1 are first mixed with a solvent 2 of a Hema monomer, and a reaction initiator is added and dispersed evenly by manual or instrumental stirring to increase the viscosity (50cp<viscosity<40000cp). In this state, the toner particles 1 will be wrapped in a cross-linked network structure to form a paste, and then a three-roller mixer is used for rolling and dispersion, with the purpose of dispersing the aggregated toner particles 1, thereby increasing the surface area of ​​the toner, and further increasing the color saturation, to obtain color paste particles 3. Since the prepared prefabricated color paste has pre-wrapped the color powder particles 1 in the polymerized Hema monomer, when mixing and blending different colors, it is only necessary to take the color paste particles 3 of different colors and mix them as the ink 4 used for transfer. When the ink 4 is used, it can be coated on the protective layer 5 of the lens 6 in the contact lens, which can improve the color shedding problem caused by incomplete coating of the protective layer in the traditional process, while ensuring the safety and aesthetics of the contact lens.

[0047] The present invention also provides a new manufacturing method for improving the color saturation of contact lens patterns, thereby improving the color shedding problem caused by incomplete coverage of the protective layer in the traditional process, while ensuring the safety and aesthetics of the contact lenses.

[0048] The present invention provides a new manufacturing method for improving the color saturation of contact lens patterns, which improves the color shedding problem caused by incomplete coating of the protective layer in the traditional process, while ensuring the safety and aesthetics of the contact lenses. The present invention significantly improves the color saturation of contact lens patterns by pre-treating the pigment toner and formulating the ink. The toner particles in the traditional process are easily aggregated due to the electrostatic effect, resulting in uneven pattern color and insufficient saturation. The present invention controls the size and distribution of the toner particles to ensure their uniform dispersion in the solution, and combines appropriate viscosity control to make the ink adhere more evenly to the lens, ultimately making the color of the pattern more vivid and saturated.

[0049] In the process of preparing the ink, the present invention uses a three-roller mixer for rolling and dispersion, so that the toner particles are evenly coated in the polymer network, effectively preventing the toner particles from being exposed to the external environment. This structural design improves the wear resistance of the pattern, so that the pattern of the contact lens can remain stable and not fade even after washing, rubbing, etc. during use, thereby extending the service life of the product.

[0050] The manufacturing method of the present invention ensures the controllability and repeatability of the contact lens pattern manufacturing process through process flow and material selection. By optimizing the configuration of the solution components in the ink (such as the reasonable ratio of HEMA or silicone hydrogel monomer, hydrophilic monomer, initiator, crosslinking agent and organic solvent), the reactivity and stability of the ink are ensured, while the wettability and wearing comfort of the contact lens are improved. This process not only simplifies the production process, but also improves production efficiency and reduces production costs.

[0051] The present invention can also produce patterns with special gloss and brightness by adding special ingredients such as gold and silver powder and pearl powder to the ink, thereby enhancing the aesthetics and market competitiveness of the contact lenses. Consumers can choose contact lenses with different visual effects according to their personal preferences, thus meeting diverse market demands.

[0052] The process design of the present invention focuses on the safety of contact lenses, especially in the selection and treatment of toner and ink, using non-toxic and harmless materials, and ensuring that the toner particles are completely coated in the polymer to avoid the risk of direct contact with the eyeball. In addition, by strictly controlling the proportion of organic solvents in the ink, the present invention also ensures the biocompatibility and safety of the contact lenses during wearing. The pigment toner and organic solvent used will not cause pollution to the environment during production and use, and the optimized production process reduces the generation of waste, meeting the requirements of modern green production.

[0053] In summary, the manufacturing method for improving the color saturation of contact lens patterns of the present invention not only effectively improves the color saturation and durability of the contact lens patterns, but also significantly improves the overall quality and market competitiveness of the contact lenses by optimizing the process flow, enriching the visual effects and enhancing product safety.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for improving the color saturation of contact lens patterns, characterized in that: The method comprises the following steps: Mix the selected single pigment powder with HEMA monomer and stir to make the pigment powder evenly dispersed; When a single pigment toner is mixed with HEMA monomer, a reaction initiator is added to carry out a polymerization reaction, and the toner particles are coated in a polymer network to form a paste by stirring; The paste is crushed and dispersed using a three-roll mixer to evenly disperse the color powder particles to obtain a single-color prefabricated color paste; The processed single color paste is mixed according to the color matching ratio to form transfer ink.

2. The method for improving the color saturation of contact lens patterns according to claim 1, characterized in that: The pigment toner is composed of powdered particles of iron oxide, titanium dioxide, carbon black or mica.

3. The method for improving the color saturation of contact lens patterns according to claim 2, characterized in that: The HEMA monomer is hydroxyethyl methacrylate.

4. The method for improving the color saturation of contact lens patterns according to claim 3, characterized in that: When mixing single pigment toner with HEMA monomer, stir manually or mechanically until the toner particles are evenly dispersed and the viscosity range is controlled between 50cP and 40000cP.

5. The method for improving the color saturation of contact lens patterns according to claim 1, characterized in that: The reaction initiator is a thermal initiator or a photoinitiator.

6. The method for improving the color saturation of contact lens patterns according to claim 5, characterized in that: The reaction initiator is an azo initiator or a photosensitive initiator.

7. The method for improving the color saturation of contact lens patterns according to claim 1, characterized in that: When a three-roller mixer is used to roll and disperse the paste, the three-roller mixer is used to roll and disperse the paste, and the particle size distribution of the processed color paste is controlled to <5μm.

8. The method for improving the color saturation of contact lens patterns according to claim 7, characterized in that: Gold and silver powder or pearl powder is added during the preparation of transfer ink, and the processed single color paste is mixed according to the CMYK color matching ratio.

9. The method for improving the color saturation of contact lens patterns according to claim 1, characterized in that: The solution components in the transfer ink include: HEMA or silicone hydrogel monomer, hydrophilic monomer, initiator and cross-linking agent.

10. The method for improving the color saturation of contact lens patterns according to claim 9, characterized in that: The solution components in the transfer ink include: 50% to 90% HEMA and / or silicone hydrogel monomers; 5% to 10% of a hydrophilic monomer, wherein the hydrophilic monomer is one or more of NVP, MAA, MPC, glycerol, PEG, PVP, and PMPC; 0.1% to 5% of an initiator, wherein the initiator is an azo initiator or a photosensitive initiator; 0.1% to 5% of a cross-linking agent, wherein the cross-linking agent is EGDMA, DEGDMA or TEGDMA; 0.1% to 40% of an organic solvent, wherein the organic solvent is one or more of aromatic hydrocarbons, aliphatic hydrocarbons, alicyclic hydrocarbons, halogenated hydrocarbons, alcohols, ethers, esters, ketones or diol derivatives.

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