KR20190075597A - Top Coat for Color Contact Lens for Pad Printing and Manufacturing Method Thereof - Google Patents

Abstract

The present invention relates to a top coat of a color contact lens for pad printing, which is coated on a printing layer of the contact lens to maintain the color of a printing paint and to secure the transparency of the color contact lens, and to a production method thereof and, more specifically, to a production method comprising the steps of: generating a polyvinyl modified resin (A); and generating a topcoat material using the polyvinyl modified resin (A). The color and the color sense of an original design of an ink layer of the color contact lens can be maintained, and the transparency of the coating layer can be secured by preventing stains when forming the ink layer on the coating layer. In addition, pad printing technique has an effect of shortening the process time while reducing the consumption of ink compared to the conventional technique.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a top coat of a color contact lens for pad printing,

The present invention relates to a top coat for the pad printing of a color contact lens and a method of manufacturing the same, and more particularly to a top coat for a pad contact printing of a contact lens, which is coated on a printing layer of a contact lens to maintain the color of the printing paint, To a top coat of a color contact lens for pad printing and a method of manufacturing the same.

The contact lens is used for the purpose of sight correction, eye treatment and diagnosis, and beauty by attaching the lens to the front of the eye, mainly the cornea. According to the material, it can be divided into hard hard contact lens and soft soft contact lens. Also, depending on the purpose of use, the lens used for correcting the visual acuity and the eye protection, the degree of bending of the cornea, the therapeutic contact lens for the purpose of treating the retina, the diagnosis used for diagnosing ophthalmic diseases or conditions Collagen-based eye protection, which is a collagen-based corneal protective film placed on the eye to protect the cornea, and a color contact lens used for cosmetics to change the outer color of the iris portion by adding color.

In particular, soft contact lenses, which are mainly used by general consumers, are inexpensive and have a soft feel, so they are used by various age groups, from adolescents to adults. Currently, the market size of domestic contact lenses is estimated to be over KRW 3,000 billion based on the consumer price, and 60% of contact lens wearers are in their teens to early 20s. Of these, 80% are female consumers, and the use of colored contact lenses, which are colored with soft contact lenses to obtain cosmetic effects, is increasing, and the age of use is also decreasing.

These contact lenses need to be used with caution, and the color soft contact lenses are less oxygen permeable compared to conventional contact lenses, and may cause corneal edema and bacterial keratitis.

In addition, most conventional color contact lenses are manufactured by printing colors or patterns on the surface of the lens. When the user wears them, the pigment is used to further block the oxygen, tears, secretions, etc., Causing a variety of side effects and causing a burden on the eyeball. Further, side effects such as inflammation or discoloration due to pigment may occur inside the cornea or eyelid contacting the printed surface of the pigment.

Korean Patent Laid-Open Publication No. 10-2004-0071368 discloses a method of coloring cosmetic color contact lenses and a method of manufacturing the same, but it is troublesome to remove the transfer paper and the pad after using the transfer paper, There is a problem that the ink is exposed to the upper layer of the lens and the pigment affects the eyeball.

Korean Patent Publication No. 10-1217833 discloses a color contact lens by a sand jet pad printing method using a nozzle jetting method or a pad coating method and a method of manufacturing the color contact lens. However, when the ink is stored and worn for a long period of time, Or the ink is exposed to the upper layer of the lens, thereby causing the pigment to affect the eyeball.

Korean Patent Publication No. 10-2004-0071368 (2004.08.12) Korean Registered Patent No. 10-0664903 (2007.01.04)

In order to solve the above-mentioned problems, the present invention is characterized in that the pigment is coated on the printing layer of the contact lens so that the pigment does not directly touch the inside of the cornea or the eyelid to maintain the color of the printing paint, ensure transparency of the color contact lens, And a method of manufacturing the same. The object of the present invention is to provide a top contact of a color contact lens for pad printing, which prevents durability and a mold transfer force from being lowered, and a method of manufacturing the same.

In order to accomplish the object, in a method for producing a top coat for pad printing of a color contact lens, 10 to 70% by weight of a polyvinyl butyral and an ethyl lactate or a solvent, A first step of preparing a first mixture by adding 30 to 90% by weight of ethoxy phenol, and a step of heating 80 to 99% by weight of the first mixture by stirring at 50 to 100 rpm 1 to 20% by weight of acrylic monomer or monoisocyanate low molecular weight isocyanate-containing monomer is dropped for 60 minutes, and after the dropping is completed, polyvinyl- A first step of putting 20 to 40% by weight of a resin, 20 to 50% by weight of a thermoplastic urethane and 10 to 60% by weight of a solvent into a flask, and a second step of heating the second mixture to 60 ° C., At 50 to 80 rpm for 30 minutes And a third step of cooling the mixture to room temperature after the stirring is completed.

In another aspect of the present invention, the top coat for pad printing of the color contact lens has a viscosity of 500 to 10,000 cps.

As described above, the color contact lens coating solution and the manufacturing method thereof according to the present invention can maintain the original color and color of the original design of the ink layer of the color contact lens and increase the adhesion between the ink layer and the coating layer and the protecting layer of the cornea, It has an effect of preventing side effects such as inflammation or discoloration caused by the direct contact of the inside of the eyelid with the ink layer by securing the inclusion, and it is also possible to use a polyvinyl-modified resin to complement the durability and the mold transferring force, It has the effect of improving the completeness.

In addition, when the ink layer is formed on the coating layer, unevenness or the like is not generated, thereby ensuring the transparency of the coating layer. The pad printing technique has the effect of shortening the processing time while reducing the amount of ink consumption compared to the prior art.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow chart of a process for producing a polyvinyl-modified resin for use in a topcoat material of a color contact lens for pad printing.
2 is a flow chart of a method of manufacturing a topcoat material of a color contact lens for pad printing.

FIG. 1 is a flow chart of a method for producing a polyvinyl-modified resin for use in a topcoat material of a color contact lens for pad printing. Referring to FIG. 1, the detailed structure of the present invention will be described below.

In the method for producing a top coat for the pad printing of a color contact lens, the polyvinyl modified water used for the top coat is prepared by mixing 10 to 70% by weight of polyvinyl butyral and ethyl lactate (polyvinyl butyral) (Step S11) of preparing the first mixture 10 by adding 30 to 90% by weight of ethyl lactate or ethoxy phenol to 80 to 99% by weight of the first mixture 10, (S12) in which 1 to 20% by weight of an acrylic monomer having an isocyanate or a monoisocyanate low molecular weight product is dropped for 60 minutes by stirring at 50 to 100 rpm when heated to 80 DEG C, (S13) of cooling to room temperature after completion.

The details of the manufacturing equipment and the detailed order are as follows.

1. Polyvinyl butyral is added to the glass reactor. The above polyvinyl butyral is obtained from Eastman's Butvar® B-72, B-74, B-76, B-79, B-90, B-98 and SEKISUI's S-LEC® B series Etc. may be used.

2. Add solvent. The solvent may be a solvent for the base of a circular lens ink binder such as ethyl lactate or ethoxy phenol, or may be an acetate, ketone or alcohol solvent such as propylene glycol monomethyl ether acetate.

3. Add an isocyanate-containing acrylic monomer or monoisocyanate powder to the dripping funnel. 3-isopropenyl-alpha, alpha-dimethylbenzylisocyanate, 2-isocyanatoethyl methacrylate, Allyl isocyanate and Methallyl isothiocyanate.

4. Heat the reactor to 80 ℃, set the mechanical stirrer at a constant rpm, and install a condenser and a thermometer on the remaining neck.

5. When the temperature of the reactant reaches 80 ° C, the dripping funnel is opened to allow the isocyanate-containing acrylic monomer or monoisocyanate low molecular weight to flow into the reactor, and the rate can be adjusted by adding an isocyanate-containing acrylic monomer or monoisocyanate It will drop itself for 60 minutes.

6. Set the mechanical stirrer rpm to about 50-100 so that hydroxyl and isocyanate-containing acrylic monomers or monoisocyanate lower molecular weight isocyanates or isocyanates in the polyvinyl butyral branch can react.

7. Reaction proceeds until the NCO% is less than 5%, and DBTDL (Dibutyltin dilaurate) series can be used.

8. Acid value is calculated by wet method with neutralization titration with 1N HCl solution and expressed as phthalocyanine indicator.

<Table 1>

Table 1 above shows hydroxyl groups in the branch of polyvinyl butyral reacted with acrylic monomers having isocyanate or isocyanate or isocyanonate of monoisocyanate low molecular weight to protect the hydroxyl group. Protecting can proceed to the desired polarity and hydrophilicity, and it can be completely protected to very low hydrophilicity. In addition, when 3-isopropenyl-alpha or alpha-dimethylbenzylisocyanate (1) is reacted, the aromatic ring at the terminal can give a slight polarity instead of protecting the hydrophilic hydroxyl group, Can be maximized. In the case of Allyl isocyanate (2) and 2-isocyanatoethyl methacrylate (3), there is a terminal double bond that maximizes the reactivity. Methallyl isothiocyanate (④) has isothiocyanate instead of isocyanate to control the reactivity The temperature may be controlled between 80 ° C and 100 ° C.

FIG. 2 is a flowchart of a method of manufacturing a top-coat material for a color contact lens for pad printing. Referring to FIG. 2, the detailed structure of the present invention will be described below.

A method for producing a top coat for the pad printing of color contact lenses, which comprises the step of adding 20 to 40% by weight of a polyvinyl modified resin (A), 20 to 50% by weight of a thermoplastic urethane and 10 to 60% A second step S20 of heating the second mixture 20 having completed the first step S10 and the first step S10 to 60 DEG C and stirring the mixture 20 at 50 to 80 rpm for 30 minutes using a stirrer, And a third step (S30) of cooling to room temperature after the stirring is completed.

The manufacturing equipment and the detailed procedure of the above first to third steps will be described in detail.

1. Place the pre-synthesized polyvinyl-modified resin in a 4-neck round bottom flask.

2. Add the thermoplastic urethane to the specified amount.

3. Add solvent at the end.

4. Insert the flask into a heating mantle, install a stirrer, and install a reflux condenser and thermometer on the remaining neck.

5. Set the temperature of the heating mantle to 60 ° C and let coolant flow through the reflux condenser.

6. Set the rpm of the stirrer to about 50-80 and stir for 30 minutes so that the polyvinyl-modified resin, thermoplastic urethane, and solvent are mixed well.

7. After stirring, cool to room temperature and obtain the mixture.

The topcoat for pad printing of the color contact lenses manufactured by the above method has a viscosity of 500 to 10,000 cps and a topcoat material having a storage stability of one month or more is produced, And the adhesion between the ink layer, the coating layer and the corneal protective layer is increased to ensure the dye-encapsulating property, thereby preventing side effects such as inflammation or discoloration caused by the direct contact of the inside of the eyelid with the ink layer. In addition, the use of a polyvinyl-modified resin has the effect of complementing durability and mold transferring force and enhancing the completeness of the dye-encapsulating property.

In addition, when the ink layer is formed on the coating layer, it is possible to ensure the transparency of the coating layer by preventing the occurrence of stains and the like. The pad printing technique has the effect of shortening the processing time while reducing the consumed amount of ink compared to the prior art.

While the invention has been shown and described with respect to specific embodiments and applications thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Anyone who has it will know it easily.

S10. First step S20. Step 2
S30. Step 3
S11. Step 1-1 S12. Step 1-2
S13. Step 1-3
10. First mixture 20. Second mixture
A. Polyvinyl Modified Resin

Claims (4)

A method of manufacturing a top coat for pad printing of a color contact lens,
10 to 70% by weight of polyvinyl butyral and 30 to 90% by weight of ethyl lactate or ethoxy phenol as a solvent are added to a glass reactor to prepare the first mixture 10 In the first step &lt; RTI ID = 0.0 &gt; S11 &
80 to 99% by weight of the first mixture (10) is heated to 80 DEG C, stirred at 50 to 100 rpm, and 1 to 20% by weight of an isocyanate-containing acrylic monomer or monoisocyanate low molecular weight product is dropped for 60 minutes Step 1-2 (S12); Wow
(A) 20 to 40% by weight of a polyvinyl-modified resin (A), 20 to 50% by weight of a thermoplastic urethane, and a solvent 10 To 60 wt% into a flask to prepare a second mixture (20); and
A second step (S20) in which the second mixture (20) is heated to 60 DEG C and stirred at 50 to 80 rpm for 30 minutes using a stirrer; and
And a third step (S30) of cooling to room temperature after the above stirring is completed. The method for manufacturing a top coat for printing pads of color contact lenses The method according to claim 1,
In the first step S10, 20 to 40% by weight of the polyvinyl-modified resin 10, 20 to 50% by weight of the thermoplastic urethane and 10 to 60% by weight of the solvent are put in order. A method of manufacturing a top coat for pad printing of a lens. The top coat for the pad printing of color contact lenses according to any one of claims 1 to 3, The method of claim 3,
And a viscosity of 500 to 10,000 cps.

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