KR102818167B1 - Binder composition for screen printing of security product - Google Patents

Abstract

A binder composition for screen printing of a security product is disclosed. According to one embodiment, the binder composition for screen printing of a security product may include a first photoinitiator; a first photopolymerization aid; a second photopolymerization aid; a first acrylic monomer; a second acrylic monomer; a third acrylic monomer; a fourth acrylic monomer; an epoxy acrylate; and a trifunctional urethane acrylate.

Description

BINDER COMPOSITION FOR SCREEN PRINTING OF SECURITY PRODUCT

The present disclosure relates to a binder composition used in screen printing of security products.

In general, banknotes, which are a type of security product, are manufactured through various printing processes such as flat printing, screen printing, intaglio printing, and letterpress printing, and the banknotes in a pure state that have completed quality inspection are cut into individual sheets and then packaged into units of belonging and substitution. In this regard, a technology for printing banknotes is presented in Korean Patent Publication No. 10-0154096.

In the case of conventional screen printing of banknotes, printing is performed using a binder composition mixed with a special pigment. However, if the penetration depth of ultraviolet rays is limited due to the pigment added to the binder composition, and the photopolymerization reaction of the composition does not proceed smoothly, it may have a negative effect on the film properties such as curability, adhesion, water resistance, contamination resistance, and alkali resistance, and may cause a deterioration in the quality of the security product. Therefore, the development of a new technology that can overcome the existing technological limitations is urgent.

The technical idea of the present disclosure is to solve the above-described problems, and its purpose is to provide a technology capable of improving the curability of a binder composition during screen printing of a security product.

In addition, the technical idea of the present disclosure has another purpose of providing a technology with excellent workability during screen printing of a security product.

In addition, the technical idea of the present disclosure has another purpose of providing a technology capable of improving the screen printing quality of a security product.

In addition, another purpose of the technical idea of the present disclosure is to provide a technology for a binder composition that is easy to photo-curable even at a low level of light.

In addition, the technical idea of the present disclosure has another purpose of providing a technology for a binder composition having excellent properties such as contamination resistance, water resistance, adhesion, flexibility, alkali resistance, and storage stability.

The problems to be solved by the present invention are not limited to the problems described above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which the present invention belongs from the contents described below.

In order to achieve these purposes, as one embodiment of the present invention, a binder composition for screen printing of a security product may include a first photoinitiator; a first photopolymerization aid; a second photopolymerization aid; a first acrylic monomer; a second acrylic monomer; a third acrylic monomer; a fourth acrylic monomer; an epoxy acrylate; and a trifunctional urethane acrylate.

And, the binder composition for screen printing of a security product may further include silicone acrylate; polyether modified polysiloxane; a second photoinitiator; a dispersant; a storage stabilizer; an alicyclic epoxy resin; a glycidyl ether monomer; a first oxetane monomer; a second oxetane monomer; a first cationic initiator; and a second cationic initiator.

In addition, the first photoinitiator is 6 to 8 wt%, the first photopolymerization assistant is 5 to 7 wt%, the second photopolymerization assistant is 5 to 7 wt%, the first acrylic monomer is 1 to 3 wt%, the second acrylic monomer is 4 to 6 wt%, the third acrylic monomer is 3 to 5 wt%, the fourth acrylic monomer is 11 to 13 wt%, the epoxy acrylate is 40 to 43 wt%, the trifunctional urethane acrylate is 3 to 5 wt%, the silicone acrylate is 0.1 to 2 wt%, the polyether modified polysiloxane is 0.1 to 1 wt%, the second photoinitiator is 0.1 to 1 wt%, the dispersant is 0.1 to 1 wt%, the storage stabilizer is 4 to 6 wt%, the alicyclic epoxy resin is 1 to 3 wt%, and the glycidyl ether monomer is The first oxetane monomer can be prepared in an amount of 1 to 3 wt%, the second oxetane monomer can be prepared in an amount of 0.5 to 1 wt%, the first cationic initiator can be prepared in an amount of 0.1 to 1 wt%, and the second cationic initiator can be prepared in an amount of 0.1 to 1 wt%.

And, the first photoinitiator may include benzophenone, the first photopolymerization assistant may include triethanolamine, the second photopolymerization assistant may include benzyl dimethyl ketal, the first acrylic monomer may include pentaerythritol polyethylene oxide tetraacrylate, the second acrylic monomer may include polyethylene glycol diacrylate, the third acrylic monomer may include 1,6-hexanediol diacrylate, and the fourth acrylic monomer may include 4-hydroxybutylacrylate.

Additionally, the second photoinitiator may include trimethylbenzoyl diphenylphosphine oxide.

Additionally, the storage stabilizer may include 10 wt % of tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]methane, 45 wt % of 1,6-hexanediol diacrylate, and 45 wt % of 2-hydroxypropylacrylate.

And, the alicyclic epoxy resin may include 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, the glycidyl ether monomer may include 1,4-cyclohexanedimethanol diglycidyl ether, the first oxetane monomer may include 3,3'-[oxybis(methylene)]bis[(3-ethyl)oxetane], the second oxetane monomer may include 3-ethyl-3-oxetanemethanol, the first cationic initiator may include propylene carbonate and [(phenylthio)phenyl]diphenylsulfonium hexafluorophosphate, and the second cationic initiator may include propylene carbonate and diphenyl(4-phenylthiophenyl)sulfonium hexafluoroantimonate.

Additionally, the security product may include at least one of banknotes, securities, ID cards, passports, identification cards, security documents, and security labels.

The above-described problem solving means are merely exemplary and should not be construed as limiting the present invention. In addition to the above-described exemplary embodiments, there may be additional embodiments described in the drawings and detailed description of the invention.

As described above, according to various embodiments of the present invention, the curability is excellent, so that the photopolymerization reaction of the composition can proceed smoothly even at a relatively low light dose (for example, 100 mJ/cm2 or less).

In addition, according to various embodiments of the present invention, the physical properties such as hardenability, contamination resistance, water resistance, adhesion, flexibility, alkali resistance, and storage stability are excellent, so that it can contribute to improving the quality of security products.

And, according to various embodiments of the present invention, the viscosity of the binder composition can be adjusted to a certain level, thereby contributing to excellent workability during screen printing and improving the screen printing quality of security products.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

A preferred embodiment of the present invention will be described in more detail with reference to the attached drawings, but technical details already known will be omitted or compressed for the sake of brevity.

It should be noted that references in this specification to “one” or “an” embodiment of the invention are not necessarily to the same embodiment, but rather mean at least one.

In the examples below, the terms first, second, etc. are not used in a limiting sense but are used for the purpose of distinguishing one component from another.

In the examples below, singular expressions include plural expressions unless the context clearly indicates a different meaning.

In the examples below, terms such as “include” or “have” mean that a feature or component described in the specification is present, and do not exclude in advance the possibility that one or more other features or components may be added.

A binder composition for screen printing of a security product according to one embodiment of the present invention is a binder composition used for applying a pigment to the surface of a security product, wherein the binder composition can be mixed with a pigment and then applied to one surface of the security product by screen printing.

In one embodiment, the security product may include at least one of banknotes, securities, ID cards, passports, identification cards, security documents, and security labels. In one embodiment, the securities are securities that have value as money, and an example of the securities is stocks. In one embodiment, the ID card is a card that contains information that can verify the identity of a user. In one embodiment, the identification card is a certificate that contains information that can verify the identity of a user, and may be made of paper or plastic. In one embodiment, the security document may be a certificate or transcript that contains specific information. In one embodiment, the security label may be a label to which a special material is applied, and may be a label that can detect whether the label has been forged or tampered with through a dedicated detector that detects a signal unique to the special material. In another embodiment, the security label may be a label to which holographic technology is applied. In another embodiment, the security label may be implemented as a non-residual label or a residual label. Here, a non-residual label is a label that leaves no residue on the surface of the adherend when the security label is attached to the adherend and then removed, and displays specific letters on the adhesive surface of the security label to enable confirmation of whether the label has come off, while a residual label is a label that displays specific letters on the surface of the adherend when the security label is attached to the adherend and then removed.

A binder composition for screen printing of a security product according to one embodiment may include a first photoinitiator, a first photopolymerization aid, a second photopolymerization aid, a first acrylic monomer, a second acrylic monomer, a third acrylic monomer, a fourth acrylic monomer, an epoxy acrylate, a trifunctional urethane acrylate, a silicone acrylate, a polyether-modified polysiloxane, a second photoinitiator, a dispersant, a storage stabilizer, an alicyclic epoxy resin, a glycidyl ether monomer, a first oxetane monomer, a second oxetane monomer, a first cationic initiator, and a second cationic initiator.

In one embodiment, the first photoinitiator may include benzophenone. The content of the first photoinitiator according to one embodiment may be 6 to 8 wt%. As a specific example, the content of the first photoinitiator may be applied as 6 wt%, 7 wt%, or 8 wt%. In addition, the content of the first photoinitiator may be in a range of one or more of the above values and one or less of the above values.

For example, the content range of the first photoinitiator may be set to a range of 6 wt% to 8 wt%, 7 wt% to 8 wt%, or 6 wt% to 7 wt%. The first photoinitiator according to one embodiment can maintain excellent film properties such as curability and durability within the above range.

If the amount of the first photoinitiator is less than 6 wt%, there is a concern that the curability may be reduced, which may have a negative effect on the adhesion or durability of the coating film. If it exceeds 8 wt%, unreacted first photoinitiator may remain as an impurity, which may deteriorate the properties of the coating film. Therefore, it is preferable that the amount of the first photoinitiator be within the above-mentioned range.

In one embodiment, the first photopolymerization assistant may include triethanolamine. The content of the first photopolymerization assistant according to one embodiment may be 5 to 7 wt%. As a specific example, the content of the first photopolymerization assistant may be applied as 5 wt%, 6 wt%, or 7 wt%. In addition, the content of the first photopolymerization assistant may be in a range of one or more of the above values and one or less of the above values.

For example, the content range of the first photopolymerization assistant may be set to a range of 5 wt% to 7 wt%, 6 wt% to 7 wt%, or 5 wt% to 6 wt%. The first photopolymerization assistant according to one embodiment can maintain excellent film properties such as curability and durability within the above range.

If the first photopolymerization assistant is less than 5 wt%, there is a concern that the curing property may be reduced, which may have a negative effect on the adhesion or durability of the coating film, and if it exceeds 7 wt%, unreacted first photopolymerization assistant may remain as an impurity, which may deteriorate the physical properties of the coating film. Therefore, it is preferable that the content of the first photopolymerization assistant be carried out within the above-mentioned range.

In one embodiment, the second photopolymerization assistant may include benzyl dimethyl ketal. The content of the second photopolymerization assistant according to one embodiment may be 5 to 7 wt%. As a specific example, the content of the second photopolymerization assistant may be applied as 5 wt%, 6 wt%, or 7 wt%. In addition, the content of the second photopolymerization assistant may be in a range of one or more of the above values and one or less of the above values.

For example, the content range of the second photopolymerization assistant may be set to a range of 5 wt% to 7 wt%, 6 wt% to 7 wt%, or 5 wt% to 6 wt%. The second photopolymerization assistant according to one embodiment can maintain excellent film properties such as curability and durability within the above range.

If the amount of the second photopolymerization aid is less than 5 wt%, there is a concern that the curing property may be reduced, which may have a negative effect on the adhesion or durability of the coating film. If it exceeds 7 wt%, unreacted second photopolymerization aid may remain as an impurity, which may deteriorate the properties of the coating film. Therefore, it is preferable that the amount of the second photopolymerization aid be within the above-mentioned range.

In one embodiment, the first acrylic monomer can comprise pentaerythritol polyethylene oxide tetraacrylate. The pentaerythritol polyethylene oxide tetraacrylate according to one embodiment can also be expressed by the term 'pentaerythritol (EO)n tetraacrylate'. Here, EO is ethylene oxide. n of pentaerythritol (EO)n tetraacrylate can be 1, 2, 3 or 4. According to one specific example, the pentaerythritol polyethylene oxide tetraacrylate can be pentaerythritol (EO) ₄ tetraacrylate.

In one embodiment, the content of the first acrylic monomer may be 1 to 3 wt%. As a specific example, the content of the first acrylic monomer may be applied as 1 wt%, 2 wt%, or 3 wt%. In addition, the content of the first acrylic monomer may be in a range of one or more of the above values and one or less of the above values.

For example, the content range of the first acrylic monomer can be set to a range of 1 wt% to 3 wt%, 2 wt% to 3 wt%, or 1 wt% to 2 wt%. The first acrylic monomer according to one embodiment can maintain excellent film properties such as curability and flexibility within the above range.

If the first acrylic monomer is less than 1 wt%, the viscosity of the mixture in which the pigment and binder composition are mixed may increase excessively, which may deteriorate the coating workability and screen printing quality, or reduce the curing properties and flexibility of the coating film. If it exceeds 3 wt%, it may have a negative effect on the overall coating film properties. Therefore, it is preferable that the content of the first acrylic monomer be implemented within the above-mentioned range.

In one embodiment, the second acrylic monomer may include polyethylene glycol diacrylate. The content of the second acrylic monomer according to one embodiment may be 4 to 6 wt%. As a specific example, the content of the second acrylic monomer may be applied as 4 wt%, 5 wt%, or 6 wt%. In addition, the content of the second acrylic monomer may be in a range of one or more of the above values and one or less of the above values.

For example, the content range of the second acrylic monomer can be set to a range of 4 wt% to 6 wt%, 5 wt% to 6 wt%, or 4 wt% to 5 wt%. The second acrylic monomer according to one embodiment can maintain excellent curability within the above range.

If the second acrylic monomer is less than 4 wt%, the curing property may be reduced or it may be difficult to control the viscosity of the binder composition, which may result in reduced painting workability. If it exceeds 6 wt%, there is a concern that it may have a negative effect on the properties of the coating film. Therefore, it is preferable that the content of the second acrylic monomer be implemented within the above-mentioned range.

In one embodiment, the third acrylic monomer may include 1,6-hexanediol diacrylate. The content of the third acrylic monomer according to one embodiment may be 3 to 5 wt%. As a specific example, the content of the third acrylic monomer may be applied as 3 wt%, 4 wt%, or 5 wt%. In addition, the content of the third acrylic monomer may be in a range of one or more of the above values and one or less of the above values.

For example, the content range of the third acrylic monomer can be set to a range of 3 wt% to 5 wt%, 3 wt% to 4 wt%, or 4 wt% to 5 wt%. The third acrylic monomer according to one embodiment can maintain excellent curability within the above range.

If the content of the third acrylic monomer is less than 3 wt%, the curing property may be reduced or it may be difficult to control the viscosity of the binder composition, which may result in reduced painting workability. If it exceeds 5 wt%, there is a concern that it may have a negative effect on the properties of the coating film. Therefore, it is preferable that the content of the third acrylic monomer be implemented within the above-mentioned range.

In one embodiment, the fourth acrylic monomer may include 4-hydroxybutylacrylate. The content of the fourth acrylic monomer according to one embodiment may be 11 to 13 wt%. As a specific example, the content of the fourth acrylic monomer may be applied as 11 wt%, 12 wt%, or 13 wt%. In addition, the content of the fourth acrylic monomer may be in a range of one or more of the above values and one or less of the above values.

For example, the content range of the fourth acrylic monomer can be set to a range of 11 wt% to 13 wt%, 11 wt% to 12 wt%, or 12 wt% to 13 wt%. The fourth acrylic monomer according to one embodiment can maintain excellent levels of curability and flexibility of the coating film within the above range.

If the content of the fourth acrylic monomer is less than 11 wt%, the physical properties such as curability and adhesion may deteriorate, or the flexibility of the coating may deteriorate, causing cracks to easily occur. If it exceeds 13 wt%, there is a concern that it may have a negative effect on the physical properties of the coating. Therefore, it is preferable that the content of the fourth acrylic monomer be implemented within the above-mentioned range.

In one embodiment, the epoxy acrylate may be directly synthesized and used or a commercially available product may be used. In the case of direct synthesis, an epoxy compound (for example, bisphenol A type epoxy resin), a styrene monomer, a reaction catalyst (for example, triphenylphosphine), acrylic acid, a polymerization inhibitor (for example, hydroquinone), etc. may be mixed and reacted to produce a modified epoxy acrylate. In one embodiment, the epoxy acrylate may be applied with a weight average molecular weight of 20,000 g/mol to 50,000 g/mol. In addition, in one embodiment, the epoxy equivalent weight (g/eq) of the epoxy acrylate may be 500 to 2,000 g/eq.

In addition, in one embodiment, the content of epoxy acrylate can be 40 to 43 wt%. As a specific example, the content of epoxy acrylate can be applied as 40 wt%, 41 wt%, 42 wt% or 43 wt%. In addition, the content of epoxy acrylate can be in a range of one or more of the above values and one or less of the above values.

For example, the content range of the epoxy acrylate can be set to a range of 40 wt% to 43 wt%, 40 wt% to 42 wt%, 41 wt% to 42 wt%, or 42 wt% to 43 wt%. The epoxy acrylate according to one embodiment can maintain excellent levels of contamination resistance and durability of the coating film within the above range.

If the epoxy acrylate content is less than 40 wt%, the contamination resistance and scratch resistance of the coating may deteriorate, and if it exceeds 43 wt%, there is a concern that the adhesion and flexibility of the coating may be negatively affected. Therefore, it is preferable that the content of epoxy acrylate be implemented within the above-mentioned range.

In one embodiment, the trifunctional urethane acrylate may be directly synthesized and used, or a commercially available product may be used. When directly synthesized, the urethane acrylate may be formed by reacting an acrylate compound (e.g., pentaerythritol triacrylate, etc.), an isocyanate compound (e.g., isophorone diisocyanate, etc.), a polyol (e.g., polycaprolactone polyol, etc.), a catalyst (e.g., dibutyltin dilaurate, etc.), and a polymerization inhibitor (e.g., hydroquinone, etc.).

In one embodiment, the trifunctional urethane acrylate can be applied with a weight average molecular weight of 30,000 g/mol to 50,000 g/mol. The content of the trifunctional urethane acrylate according to one embodiment can be 3 to 5 wt%. As a specific example, the content of the trifunctional urethane acrylate can be applied as 3 wt%, 4 wt%, or 5 wt%. In addition, the content of the trifunctional urethane acrylate can be in a range of one or more of the above values and one or less of the above values.

For example, the content range of the trifunctional urethane acrylate can be set to a range of 3 wt% to 5 wt%, 3 wt% to 4 wt%, or 4 wt% to 5 wt%. The trifunctional urethane acrylate according to one embodiment can maintain the hardness and durability of the coating film at an excellent level within the above range.

If the content of trifunctional urethane acrylate is less than 3 wt%, the hardness, contamination resistance, scratch resistance, etc. of the coating film may deteriorate, and if it exceeds 5 wt%, there is a concern that the adhesion or flexibility of the coating film may be negatively affected. Therefore, it is preferable that the content of trifunctional urethane acrylate be implemented within the above-mentioned range.

In one embodiment, the content of silicone acrylate can be 0.1 to 2 wt%. As specific examples, the content of silicone acrylate can be applied as 0.1 wt%, 0.2 wt% 0.3 wt%, 0.5 wt%, 0.7 wt%, 0.9 wt%, 1 wt%, 1.5 wt% or 2 wt%. In addition, the content of silicone acrylate can be in a range of one or more of the above values and one or less of the above values.

For example, the content range of silicone acrylate can be set to a range of 0.1 wt% to 2 wt%, 0.5 wt% to 1 wt%, or 0.7 wt% to 2 wt%. The silicone acrylate according to one embodiment can maintain screen printing workability and printing quality at an excellent level within the above range.

If the silicone acrylate content is less than 0.1 wt%, it may be difficult to control bubble generation during screen printing, which may lower workability and printing quality. If it exceeds 2 wt%, it may have a negative effect on the overall film properties. Therefore, it is preferable that the silicone acrylate content be within the above-mentioned range.

In one embodiment, the content of the polyether-modified polysiloxane may be 0.1 to 1 wt%. As specific examples, the content of the polyether-modified polysiloxane may be applied as 0.1 wt%, 0.2 wt% 0.3 wt%, 0.5 wt%, 0.7 wt%, 0.9 wt% or 1 wt%. In addition, the content of the polyether-modified polysiloxane may be in a range of one or more of the above values and one or less of the above values.

For example, the content range of the polyether-modified polysiloxane can be set to a range of 0.1 wt% to 1 wt%, 0.2 wt% to 1 wt%, or 0.3 wt% to 1 wt%. The polyether-modified polysiloxane according to one embodiment can maintain the flowability, screen printing workability, and printing quality of the binder composition at excellent levels within the above range.

If the polyether-modified polysiloxane is less than 0.1 wt%, there is a concern that the composition may clump during screen printing, which may deteriorate the printing workability and printing quality. If it exceeds 1 wt%, it may have a negative effect on the overall coating film properties. Therefore, it is preferable that the content of the polyether-modified polysiloxane be implemented within the above-mentioned range.

In one embodiment, the second photoinitiator may include trimethylbenzoyl diphenylphosphine oxide. The content of the second photoinitiator according to one embodiment may be 0.1 to 1 wt%. As a specific example, the content of the second photoinitiator may be applied as 0.1 wt%, 0.2 wt% 0.3 wt%, 0.5 wt%, 0.7 wt%, 0.9 wt%, or 1 wt%. In addition, the content of the second photoinitiator may be in a range of one or more of the above values and one or less of the above values.

For example, the content range of the second photoinitiator can be set to a range of 0.1 wt% to 1 wt%, 0.2 wt% to 1 wt%, or 0.3 wt% to 1 wt%. The second photoinitiator according to one embodiment can maintain the curability of the binder composition at an excellent level within the above range.

If the amount of the second photoinitiator is less than 0.1 wt%, it is difficult to cure the interior of the coating film, resulting in poor curing properties. If it exceeds 1 wt%, unreacted second photoinitiator may remain as an impurity, resulting in poor coating properties. Therefore, it is preferable that the amount of the second photoinitiator be within the above-mentioned range.

In one embodiment, the content of the dispersant may be 0.1 to 1 wt%. As specific examples, the content of the dispersant may be applied as 0.1 wt%, 0.2 wt% 0.3 wt%, 0.5 wt%, 0.7 wt%, 0.9 wt% or 1 wt%. In addition, the content of the dispersant may be in a range of one or more of the above values and one or less of the above values.

For example, the content range of the dispersant may be set to a range of 0.1 wt% to 1 wt%, 0.2 wt% to 1 wt%, or 0.3 wt% to 1 wt%. If the content of the dispersant is less than 0.1 wt%, the dispersibility is poor, and if it exceeds 1 wt%, there is a concern that it may have a negative effect on the properties of the coating film, so it is preferable that the content of the dispersant be implemented within the above-mentioned range.

In one embodiment, the storage stabilizer can include 10 wt % tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] methane, 45 wt % 1,6-hexanediol diacrylate, and 45 wt % 2-hydroxypropyl acrylate.

In one embodiment, if the amount of tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]methane included in the storage stabilizer is less than 10 wt%, the storage stability may deteriorate, and if it exceeds 10 wt%, the surface of the film may become uneven and not smooth during screen printing of the binder composition, which may result in poor appearance. In addition, in one embodiment, by mixing 1,6-hexanediol diacrylate and 2-hydroxypropyl acrylate in a weight ratio of 1:1 in the storage stabilizer and mixing it with tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]methane, the solubility of tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]methane particles can be increased.

The content of the storage stabilizer according to one embodiment may be 4 to 6 wt%. As a specific example, the content of the storage stabilizer may be applied as 4 wt%, 5 wt% or 6 wt%. In addition, the content of the storage stabilizer may be in a range of one or more of the above values and one or less of the above values.

For example, the content range of the storage stabilizer can be set to a range of 4 wt% to 6 wt%, 4 wt% to 5 wt%, or 5 wt% to 6 wt%. The storage stabilizer according to one embodiment can maintain the storage stability of the binder composition at an excellent level within the above range.

If the storage stabilizer is less than 4 wt%, the binder composition may gel during storage, which may result in a deterioration in physical properties. If it exceeds 6 wt%, it may have a negative effect on the physical properties of the coating. Therefore, it is preferable that the content of the storage stabilizer be within the above-mentioned range.

In one embodiment, the cycloaliphatic epoxy resin may include 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate. The content of the cycloaliphatic epoxy resin according to one embodiment may be 1 to 3 wt%. As a specific example, the content of the cycloaliphatic epoxy resin may be applied as 1 wt%, 2 wt%, or 3 wt%. In addition, the content of the cycloaliphatic epoxy resin may be in a range of one or more of the above values and one or less of the above values.

For example, the content range of the alicyclic epoxy resin can be set to a range of 1 wt% to 3 wt%, 1 wt% to 2 wt%, or 2 wt% to 3 wt%. The alicyclic epoxy resin according to one embodiment can maintain the curability of the binder composition at an excellent level within the above range.

If the alicyclic epoxy resin is less than 1 wt%, it is difficult to harden the interior of the coating film, resulting in poor curing properties. If it exceeds 3 wt%, unreacted alicyclic epoxy resin may remain as an impurity, resulting in poor coating film properties. Therefore, it is preferable that the content of the alicyclic epoxy resin be within the above-mentioned range.

In one embodiment, the glycidyl ether monomer may include 1,4-cyclohexanedimethanol diglycidyl ether. The content of the glycidyl ether monomer according to one embodiment may be 1 to 3 wt%. As a specific example, the content of the glycidyl ether monomer may be applied as 1 wt%, 2 wt%, or 3 wt%. In addition, the content of the glycidyl ether monomer may be in a range of one or more of the above values and one or less of the above values.

For example, the content range of the glycidyl ether monomer can be set to a range of 1 wt% to 3 wt%, 1 wt% to 2 wt%, or 2 wt% to 3 wt%. The glycidyl ether monomer according to one embodiment can maintain the curability of the binder composition at an excellent level within the above range.

If the glycidyl ether monomer is less than 1 wt%, it is difficult to cure to the inside of the coating film, resulting in poor curing properties. If it exceeds 3 wt%, unreacted glycidyl ether monomer may remain as an impurity, resulting in poor coating film properties. Therefore, it is preferable that the content of the glycidyl ether monomer be within the above-mentioned range.

In one embodiment, the first oxetane monomer can include 3,3'-[oxybis(methylene)]bis[(3-ethyl)oxetane](3,3'-[OXYBIS(METHYLENE)]BIS[(3-ETHYL)OXETANE]). The content of the first oxetane monomer according to one embodiment can be 1 to 3 wt%. As a specific example, the content of the first oxetane monomer can be applied as 1 wt%, 2 wt%, or 3 wt%. In addition, the content of the first oxetane monomer can be in a range of one or more of the above values and one or less of the above values.

For example, the content range of the first oxetane monomer can be set to a range of 1 wt% to 3 wt%, 1 wt% to 2 wt%, or 2 wt% to 3 wt%. The first oxetane monomer according to one embodiment can maintain the curability of the binder composition at an excellent level within the above range.

If the first oxetane monomer is less than 1 wt%, it is difficult to cure to the inside of the coating film, resulting in poor curing properties. If it exceeds 3 wt%, unreacted first oxetane monomer may remain as an impurity, resulting in poor coating film properties. Therefore, it is preferable that the content of the first oxetane monomer be within the above-mentioned range.

In one embodiment, the second oxetane monomer may include 3-ethyl-3-oxetanemethanol. The content of the second oxetane monomer according to one embodiment may be 0.5 to 1 wt%. As a specific example, the content of the second oxetane monomer may be applied as 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, 0.9 wt%, or 1 wt%. In addition, the content of the second oxetane monomer may be in a range of one or more of the above values and one or less of the above values.

For example, the content range of the second oxetane monomer can be set to a range of 0.5 wt% to 1 wt%, 0.6 wt% to 1 wt%, or 0.7 wt% to 1 wt%. The second oxetane monomer according to one embodiment can maintain the curability of the binder composition at an excellent level within the above range.

If the amount of the second oxetane monomer is less than 0.5 wt%, it is difficult to cure the interior of the coating film, resulting in poor curing properties. If it exceeds 1 wt%, unreacted second oxetane monomer may remain as an impurity, resulting in poor coating film properties. Therefore, it is preferable that the amount of the second oxetane monomer be within the above-mentioned range.

In one embodiment, the first cationic initiator can include propylene carbonate and [(phenylthio)phenyl]diphenylsulfonium hexafluorophosphate. For example, the first cationic initiator can include 50 wt % propylene carbonate and 50 wt % [(phenylthio)phenyl]diphenylsulfonium hexafluorophosphate.

The content of the first cationic initiator according to one embodiment may be 0.1 to 1 wt%. As a specific example, the content of the first cationic initiator may be applied as 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, 0.9 wt%, or 1 wt%. In addition, the content of the first cationic initiator may be in a range of one or more of the above values and one or less of the above values.

For example, the content range of the first cationic initiator can be set to a range of 0.1 wt% to 1 wt%, 0.2 wt% to 1 wt%, or 0.3 wt% to 1 wt%. The first cationic initiator according to one embodiment can maintain the curability of the binder composition at an excellent level within the above range.

If the first cationic initiator is less than 0.1 wt%, it is difficult to cure to the inside of the coating film, resulting in poor curing properties. If it exceeds 1 wt%, unreacted first cationic initiator may remain as an impurity, resulting in poor coating film properties. Therefore, it is preferable that the content of the first cationic initiator be within the above-mentioned range.

In one embodiment, the second cationic initiator can include propylene carbonate and diphenyl(4-phenylthiophenyl)sulfonium hexafluoroantimonate. For example, the second cationic initiator can include 50 wt % propylene carbonate and 50 wt % diphenyl(4-phenylthiophenyl)sulfonium hexafluoroantimonate.

The content of the second cationic initiator according to one embodiment may be 0.1 to 1 wt%. As a specific example, the content of the second cationic initiator may be applied as 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, 0.9 wt%, or 1 wt%. In addition, the content of the second cationic initiator may be in a range of one or more of the above values and one or less of the above values.

For example, the content range of the second cationic initiator can be set to a range of 0.1 wt% to 1 wt%, 0.2 wt% to 1 wt%, or 0.3 wt% to 1 wt%. The second cationic initiator according to one embodiment can maintain the curability of the binder composition at an excellent level within the above range.

If the amount of the second cationic initiator is less than 0.1 wt%, it is difficult to cure the interior of the coating film, resulting in poor curing properties. If it exceeds 1 wt%, unreacted second cationic initiator may remain as an impurity, resulting in poor coating properties. Therefore, it is preferable that the amount of the second cationic initiator be within the above-mentioned range.

Hereinafter, the present invention will be described in more detail through specific examples and experimental examples. The following examples and experimental examples are merely examples to help understand the present invention, and therefore the scope of the rights of the present invention is not limited or restricted thereto.

Preparation of binder composition for screen printing of security products

The compositions shown in Tables 1 to 4 below were mixed, and in a 1 L container, the first photoinitiator, the first photopolymerization aid, the second photopolymerization aid, the first acrylic monomer, the second acrylic monomer, the third acrylic monomer, the quaternary acrylic monomer, the epoxy acrylate, the trifunctional urethane acrylate, the silicone acrylate, the polyether-modified polysiloxane, the second photoinitiator, the dispersant, the storage stabilizer, the alicyclic epoxy resin, the glycidyl ether monomer, the first oxetane monomer, the second oxetane monomer, the first cationic initiator, and the second cationic initiator were mixed in the contents (unit: grams) shown in Tables 1 to 4 below, and stirred for 1 hour, thereby completing a binder composition for screen printing of security products.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Example 4 Example 5 Example 6 Comparative Example 3 Comparative Example 4 1 7 7 6 7 6 7 7 6 7 6 2 5 6 7 4 8 6 5 5 7 5 3 6 5 5 7 5 5 6 7 4 8 4 2 2 2 2 2 2 2 2 2 2 5 5 5 5 5 4 5 5 5 5 4 6 4 4 4 4 4 4 4 4 4 4 7 12 12 12 12 12 12 12 12 12 12 8 40 40 40 40 40 40 40 40 40 40 9 4 4 4 4 4 4 4 4 4 4 10 1 1 1 1 1 1 1 1 1 1 11 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 12 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 13 1 1 1 1 1 1 1 1 1 1 14 5 5 5 5 5 5 5 5 5 5 15 2 2 2 2 2 2 2 2 2 2 16 2 2 2 2 2 2 2 2 2 2 17 2 2 2 2 2 2 2 2 2 2 18 1 1 1 1 1 1 1 1 1 1 19 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 20 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 main)
1: First photoinitiator - Benzophenone (Miwon Specialty Chemical Co.)
2: First photopolymerization aid - Triethylamine (BASF)
3: Second photopolymerization aid - IRGACURE 651 (Miwon Specialty Chemical Co.)
4: 1st acrylic monomer - PE(EO) ₄ TTA (Miwon Specialty Chemical Co.)
5: Second acrylic monomer - polyethylene glycol 400 diacrylate (Miwon Specialty Chemical Co.)
6: Tertiary acrylic monomer - 1,6-hexanediol diacrylate (Miwon Specialty Chemical Co.)
7: Quaternary acrylic monomer - 4-hydroxybutylacrylate (OSAKA ORGANIC CHEMICAL INDUSTRY)
8: Epoxy Acrylate - 152110 (Jogwang Paint Co.)
9: Trifunctional urethane acrylate - EBECRYL 9260 (Entis)
10: Silicone Acrylate - Tego RAD 2500 (EVONIK)
11: Polyether modified polysiloxane - AFCONA 3085 (AFCONA)
12: Second photoinitiator - 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide (BEIJING MULTI CHEM & TECH)
13: Dispersant - DISPERBYK-162 (BYK)
14: Storage stabilizer - 10 wt% tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]methane, 45 wt% 1,6-hexanediol diacrylate and 45 wt% 2-hydroxypropylacrylate
15: Alicyclic epoxy resin - C2021P (DAICEL)
16: Glycidyl ether monomer - LD-204 (Kukdo Fine Chem Co., Ltd.)
17: 1st Oxetane Monomer - OXT-221 (TOAGOSEI)
18: Second Oxetane Monomer - OXT-101 (TOAGOSEI)
19: First cationic initiator - CPI-100P (San-Apro)
20: Second Cation Initiator - D-6976 (SHENZHEN XINYAN MATERIAL TECHNOLOGY)

division Example 7 Example 8 Example 9 Comparative Example 5 Comparative Example 6 Example 10 Example 11 Example 12 Comparative Example 7 Comparative Example 8 1 7 7 7 7 6 7 7 6 7 6 2 6 6 5 7 5 6 6 6 6 6 3 6 5 5 6 5 6 6 6 6 5 4 1 2 3 0 4 2 2 2 2 2 5 5 5 5 5 5 5 4 4 6 4 6 4 4 4 4 4 3 4 5 2 6 7 12 12 12 12 12 12 12 12 12 12 8 40 40 40 40 40 40 40 40 40 40 9 4 4 4 4 4 4 4 4 4 4 10 1 1 1 1 1 1 1 1 1 1 11 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 12 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 13 1 1 1 1 1 1 1 1 1 1 14 5 5 5 5 5 5 5 5 5 5 15 2 2 2 2 2 2 2 2 2 2 16 2 2 2 2 2 2 2 2 2 2 17 2 2 2 2 2 2 2 2 2 2 18 1 1 1 1 1 1 1 1 1 1 19 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 20 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 main)
1: First photoinitiator - Benzophenone (Miwon Specialty Chemical Co.)
2: First photopolymerization aid - Triethylamine (BASF)
3: Second photopolymerization aid - IRGACURE 651 (Miwon Specialty Chemical Co.)
4: 1st acrylic monomer - PE(EO) ₄ TTA (Miwon Specialty Chemical Co.)
5: Second acrylic monomer - polyethylene glycol 400 diacrylate (Miwon Specialty Chemical Co.)
6: Tertiary acrylic monomer - 1,6-hexanediol diacrylate (Miwon Specialty Chemical Co.)
7: Quaternary acrylic monomer - 4-hydroxybutylacrylate (OSAKA ORGANIC CHEMICAL INDUSTRY)
8: Epoxy Acrylate - 152110 (Jogwang Paint Co.)
9: Trifunctional urethane acrylate - EBECRYL 9260 (Entis)
10: Silicone Acrylate - Tego RAD 2500 (EVONIK)
11: Polyether modified polysiloxane - AFCONA 3085 (AFCONA)
12: Second photoinitiator - 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide (BEIJING MULTI CHEM & TECH)
13: Dispersant - DISPERBYK-162 (BYK)
14: Storage stabilizer - 10 wt% tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]methane, 45 wt% 1,6-hexanediol diacrylate and 45 wt% 2-hydroxypropylacrylate
15: Alicyclic epoxy resin - C2021P (DAICEL)
16: Glycidyl ether monomer - LD-204 (Kukdo Fine Chem Co., Ltd.)
17: 1st Oxetane Monomer - OXT-221 (TOAGOSEI)
18: Second Oxetane Monomer - OXT-101 (TOAGOSEI)
19: First cationic initiator - CPI-100P (San-Apro)
20: Second Cation Initiator - D-6976 (SHENZHEN XINYAN MATERIAL TECHNOLOGY)

division Example 13 Example 14 Example 15 Comparative Example 9 Comparative Example 10 Example 16 Example 17 Example 18 Comparative Example 11 Comparative Example 12 1 7 7 7 7 7 7 7 6 8 6 2 6 6 6 6 6 6 5 5 6 5 3 6 6 6 6 5 6 6 6 6 5 4 2 2 2 2 2 2 2 2 2 2 5 5 5 4 5 4 5 5 5 5 5 6 4 3 3 5 3 4 4 4 4 4 7 11 12 13 10 14 12 12 12 12 12 8 40 40 40 40 40 40 40 40 40 40 9 4 4 4 4 4 4 4 4 4 4 10 1 1 1 1 1 1 1 1 1 1 11 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 12 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 13 1 1 1 1 1 1 1 1 1 1 14 5 5 5 5 5 4 5 6 3 7 15 2 2 2 2 2 2 2 2 2 2 16 2 2 2 2 2 2 2 2 2 2 17 2 2 2 2 2 2 2 2 2 2 18 1 1 1 1 1 1 1 1 1 1 19 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 20 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 main)
1: First photoinitiator - Benzophenone (Miwon Specialty Chemical Co.)
2: First photopolymerization aid - Triethylamine (BASF)
3: Second photopolymerization aid - IRGACURE 651 (Miwon Specialty Chemical Co.)
4: 1st acrylic monomer - PE(EO) ₄ TTA (Miwon Specialty Chemical Co.)
5: Second acrylic monomer - polyethylene glycol 400 diacrylate (Miwon Specialty Chemical Co.)
6: Tertiary acrylic monomer - 1,6-hexanediol diacrylate (Miwon Specialty Chemical Co.)
7: Quaternary acrylic monomer - 4-hydroxybutylacrylate (OSAKA ORGANIC CHEMICAL INDUSTRY)
8: Epoxy Acrylate - 152110 (Jogwang Paint Co.)
9: Trifunctional urethane acrylate - EBECRYL 9260 (Entis)
10: Silicone Acrylate - Tego RAD 2500 (EVONIK)
11: Polyether modified polysiloxane - AFCONA 3085 (AFCONA)
12: Second photoinitiator - 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide (BEIJING MULTI CHEM & TECH)
13: Dispersant - DISPERBYK-162 (BYK)
14: Storage stabilizer - 10 wt% tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]methane, 45 wt% 1,6-hexanediol diacrylate and 45 wt% 2-hydroxypropylacrylate
15: Alicyclic epoxy resin - C2021P (DAICEL)
16: Glycidyl ether monomer - LD-204 (Kukdo Fine Chem Co., Ltd.)
17: 1st Oxetane Monomer - OXT-221 (TOAGOSEI)
18: Second Oxetane Monomer - OXT-101 (TOAGOSEI)
19: First cationic initiator - CPI-100P (San-Apro)
20: Second Cation Initiator - D-6976 (SHENZHEN XINYAN MATERIAL TECHNOLOGY)

division Example 19 Example 20 Example 21 Comparative Example 13 Comparative Example 14 Example 22 Example 23 Example 24 Example 25 1 7 6 6 7 6 8 7 6 6 2 5 5 5 5 5 7 6 5 5 3 6 6 6 6 6 5 6 5 7 4 2 2 2 2 1.5 1 2 1 3 5 5 5 4 5 4 6 5 4 4 6 4 4 4 4.5 3 3 4 3 5 7 12 11.5 11 13 11 13 12 11 11 8 40 41.5 43 38.5 44.5 40 41.2 40 40 9 4 4 4 4 4 3 4 5 5 10 1 1 1 1 1 0.1 1 2 2 11 0.2 0.2 0.2 0.2 0.2 1 0.5 0.1 1 12 0.5 0.5 0.5 0.5 0.5 0.1 0.5 1 0.4 13 1 1 1 1 1 1 0.5 0.8 0.1 14 5 5 5 5 5 4 5 6 5 15 2 2 2 2 2 1 2 3 1 16 2 2 2 2 2 3 1 2 1 17 2 2 2 2 2 2 1 3 1 18 1 1 1 1 1 0.7 0.5 1 1 19 0.2 0.2 0.2 0.2 0.2 0.1 0.5 1 1 20 0.1 0.1 0.1 0.1 0.1 1 0.3 0.1 0.5 main)
1: First photoinitiator - Benzophenone (Miwon Specialty Chemical Co.)
2: First photopolymerization aid - Triethylamine (BASF)
3: Second photopolymerization aid - IRGACURE 651 (Miwon Specialty Chemical Co.)
4: 1st acrylic monomer - PE(EO) ₄ TTA (Miwon Specialty Chemical Co.)
5: Second acrylic monomer - polyethylene glycol 400 diacrylate (Miwon Specialty Chemical Co.)
6: Tertiary acrylic monomer - 1,6-hexanediol diacrylate (Miwon Specialty Chemical Co.)
7: Quaternary acrylic monomer - 4-hydroxybutylacrylate (OSAKA ORGANIC CHEMICAL INDUSTRY)
8: Epoxy Acrylate - 152110 (Jogwang Paint Co.)
9: Trifunctional urethane acrylate - EBECRYL 9260 (Entis)
10: Silicone Acrylate - Tego RAD 2500 (EVONIK)
11: Polyether modified polysiloxane - AFCONA 3085 (AFCONA)
12: Second photoinitiator - 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide (BEIJING MULTI CHEM & TECH)
13: Dispersant - DISPERBYK-162 (BYK)
14: Storage stabilizer - 10 wt% tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]methane, 45 wt% 1,6-hexanediol diacrylate and 45 wt% 2-hydroxypropylacrylate
15: Alicyclic epoxy resin - C2021P (DAICEL)
16: Glycidyl ether monomer - LD-204 (Kukdo Fine Chem Co., Ltd.)
17: 1st Oxetane Monomer - OXT-221 (TOAGOSEI)
18: Second Oxetane Monomer - OXT-101 (TOAGOSEI)
19: First cationic initiator - CPI-100P (San-Apro)
20: Second Cation Initiator - D-6976 (SHENZHEN XINYAN MATERIAL TECHNOLOGY)

Testing and Evaluation Methods

Preparing Paints for Screen Printing

The binder composition for each example and comparative example was mixed with a pigment (a plate-shaped multilayer inorganic material pigment containing mica, aluminum, and alumina) to prepare a paint for screen printing. When mixing the binder composition and the pigment, 10 parts by weight of the pigment was mixed per 100 parts by weight of the binder composition.

Experimental environment conditions

The experimental environment, i.e. the place where the experiment was conducted, was a place with no direct sunlight, very little gas, vapor, dust, and ventilation, with a temperature of 20±2℃ and a humidity of 65±5% (hereinafter referred to as “room temperature”), and the experiment was conducted in this environment.

Hardening evaluation

Each example and comparative example of a screen-printing paint was screen-printed on a 0.1 mm thick cotton fiber measuring 10 cm in width and 10 cm in length so that the thickness of the dry film was 20 μm, and the film was cured for 5 seconds at a light amount of 100 mJ/cm2 using a UV LED lamp with a single wavelength of 365 nm, and the curability was evaluated respectively. After rubbing the cured film with a fingernail 20 times in the same direction and in the perpendicular direction to the coating direction, the scratch marks remaining on the film were observed with the naked eye. If no scratches appeared, the curability was evaluated as good, if the scratches were slightly visible, the curability was evaluated as medium, and if the scratches were clearly visible, the curability was evaluated as poor. The results are shown in Table 5 below.

My contamination assessment

Each example and comparative example of a screen-printing paint was screen-printed on a 0.1 mm thick cotton fabric measuring 10 cm in width and 10 cm in length so that the thickness of the dry film was 20 μm, and the film was cured for 5 seconds at a light amount of 100 mJ/cm2 using a UV LED lamp with a single wavelength of 365 nm. After that, the film was contaminated with black oil-based magic, and the magic marks were erased with a dry cloth and the surface condition was checked. If there were no magic marks, the contamination resistance was evaluated as good, and if magic marks remained, the contamination resistance was evaluated as poor, and the results are shown in Table 5 below.

Water resistance evaluation

Each example and comparative example of screen printing paint was screen-printed on a 0.1 mm thick cotton fiber measuring 10 cm in width and 10 cm in length so that the thickness of the dry film was 20 μm, and the film was cured for 5 seconds at a light amount of 100 mJ/cm2 using a UV LED lamp with a single wavelength of 365 nm to produce a specimen, and after immersing the specimen in a water tank containing 60°C water for 24 hours, it was taken out and visually checked for any deformation in appearance. If the appearance was not deformed, the water resistance was evaluated as good, and if the appearance was deformed, the water resistance was evaluated as poor, and the results are shown in Table 5 below.

Adhesion assessment

Each example and comparative example of a screen-printing paint was screen-printed on a glass plate measuring 30 cm in width and 30 cm in height so that the thickness of the dry film was 20 μm, and the film was cured for 5 seconds at a light amount of 100 mJ/cm2 using a UV LED lamp with a single wavelength of 365 nm, and a cross-cutting test method was performed on the cured film, at which time glass tape was used. That is, the film was cut into 100 checkerboard-shaped sections of 1 mm x 1 mm in size, and glass tape was attached to the sections. The number of sections that did not fall off when removed but were still attached to the substrate was measured to evaluate the adhesion, and the results are shown in Table 5 below.

Flexibility Assessment

Each example and comparative example of screen printing paint was screen-printed on a 0.1 mm thick cotton fiber measuring 10 cm in width and 10 cm in length so that the thickness of the dry film was 20 μm, and the film was cured for 5 seconds at a light amount of 100 mJ/cm2 using a UV LED lamp with a single wavelength of 365 nm to manufacture a specimen. The specimen was folded at 90 degrees to the floor on both sides and then unfolded 100 times in a continuous motion (the speed of the specimen folding was once per second). It was visually checked whether cracks occurred at the folded portion, and if no cracks occurred, the flexibility was evaluated as good, and if cracks occurred, the flexibility was evaluated as poor. The results are shown in Table 5 below.

Workability Evaluation

When applying screen printing paint according to each example and comparative example on a screen mask during screen printing and pushing the paint out with a squeegee, it is visually checked whether the paint clumps up. If no clumping occurs, the workability is evaluated as good. If clumping occurs, the workability is evaluated as poor. The results are recorded in Table 5 below.

My alkaline evaluation

Each example and comparative example of a screen-printing paint was screen-printed on a 0.1 mm thick cotton fiber measuring 10 cm in width and 10 cm in length so that the thickness of the dry film was 20 μm, and the film was cured for 5 seconds at a light amount of 100 mJ/cm2 using a UV LED lamp with a single wavelength of 365 nm to prepare a specimen. 10 g of alkaline detergent and 1 kg of water were put into a stirrer together with the specimen and stirred at a speed of 100 rpm for 1 hour, and then the specimen was taken out and the adhesion of the film was visually checked. If the film did not peel off from the cotton fiber, the alkali resistance was evaluated as good, and if the film peeled off from the cotton fiber or a lifting phenomenon occurred, the alkali resistance was evaluated as poor, and the results are shown in Table 5 below.

Storage stability evaluation

Each binder composition for each example and comparative example was placed in a 100 g container, left at 60°C for 1 month, and then visually checked to see if gelation occurred. If gelation occurred, the storage stability was evaluated as poor, and if gelation did not occur, the storage stability was evaluated as good. The results are shown in Table 5 below.

division Hardening My contamination resistance Water resistance Adhesiveness pliability Workability My alkaline Storage stability Example 1 Good Good Good 100/100 Good Good Good Good Example 2 Good Good Good 100/100 Good Good Good Good Example 3 Good Good Good 100/100 Good Good Good Good Comparative Example 1 middle error Good 100/100 Good Good error Good Comparative Example 2 Good Good Good 100/100 error Good Good error Example 4 Good Good Good 100/100 Good Good Good Good Example 5 Good Good Good 100/100 Good Good Good Good Example 6 Good Good Good 100/100 Good Good Good Good Comparative Example 3 error error Good 100/100 Good Good error Good Comparative Example 4 Good Good Good 100/100 error Good Good Good Example 7 Good Good Good 100/100 Good Good Good Good Example 8 Good Good Good 100/100 Good Good Good Good Example 9 Good Good Good 100/100 Good Good Good Good Comparative Example 5 middle error Good 100/100 Good Good error Good Comparative Example 6 Good Good Good 100/100 error error Good Good Example 10 Good Good Good 100/100 Good Good Good Good Example 11 Good Good Good 100/100 Good Good Good Good Example 12 Good Good Good 100/100 Good Good Good Good Comparative Example 7 Good Good Good 100/100 Good error Good Good Comparative Example 8 middle Good Good 100/100 Good Good Good Good Example 13 Good Good Good 100/100 Good Good Good Good Example 14 Good Good Good 100/100 Good Good Good Good Example 15 Good Good Good 100/100 Good Good Good Good Comparative Example 9 Good Good Good 90/100 Good error Good Good Comparative Example 10 middle Good Good 100/100 Good Good Good Good Example 16 Good Good Good 100/100 Good Good Good Good Example 17 Good Good Good 100/100 Good Good Good Good Example 18 Good Good Good 100/100 Good Good Good Good Comparative Example 11 Good Good Good 100/100 Good Good Good error Comparative Example 12 middle Good Good 100/100 Good Good Good Good Example 19 Good Good Good 100/100 Good Good Good Good Example 20 Good Good Good 100/100 Good Good Good Good Example 21 Good Good Good 100/100 Good Good Good Good Comparative Example 13 middle Good Good 100/100 Good Good Good Good Comparative Example 14 Good Good Good 100/100 error error Good Good Example 22 Good Good Good 100/100 Good Good Good Good Example 23 Good Good Good 100/100 Good Good Good Good Example 24 Good Good Good 100/100 Good Good Good Good Example 25 Good Good Good 100/100 Good Good Good Good

Referring to the results described in Table 5, it can be confirmed that Comparative Examples 1 to 14, which exceed the content range of each component of the binder composition, have lower curing properties, contamination resistance, water resistance, adhesion, flexibility, workability, alkali resistance, storage stability, etc. than Examples 1 to 25, and are therefore not suitable for use in screen printing of security products.

As described above, according to various embodiments of the present invention, since the curability is excellent, the photopolymerization reaction of the composition can proceed smoothly even at a relatively low light dose (for example, 100 mJ/cm2 or less). According to various embodiments of the present invention, curing is possible even at a low light dose of 10 mJ/cm2 or more to 100 mJ/cm2 or less (for example, 10 mJ/cm2, 20 mJ/cm2, 30 mJ/cm2, 40 mJ/cm2, 50 mJ/cm2, 60 mJ/cm2, 70 mJ/cm2, 80 mJ/cm2, 90 mJ/cm2 or 100 mJ/cm2).

In addition, according to various embodiments of the present invention, the coating film has excellent properties such as curability, adhesion, water resistance, contamination resistance, alkali resistance, and storage stability, which can contribute to improving the quality of security products.

In addition, according to various embodiments of the present invention, even when printed on cotton fiber having a thickness of 0.1 mm, the film has excellent elasticity and flexibility, so no cracks occur, and can be widely used as a binder composition for screen printing of security products.

And, according to various embodiments of the present invention, by controlling the viscosity of the binder composition to a certain level, it is possible to contribute to excellent workability during screen printing and to improving the screen printing quality of security products. That is, in various embodiments of the present invention, by controlling the viscosity of the binder composition to 250 cps or less, even when a highly absorbent pigment and the binder composition are mixed, the viscosity of the mixture can be controlled to a certain level or less, so that the paint does not clump during screen printing, thereby improving workability and printing quality.

As described above, the specific description of the present invention has been made by way of examples. However, the above-described examples have only been described as preferred examples of the present invention. Therefore, the present invention should not be understood as being limited to the above-described examples, and the scope of the rights of the present invention should be understood by the claims described below and their equivalents.

Claims (8)

6-8 wt% of first photoinitiator;
5 to 7 wt% of first photopolymerization aid;
5 to 7 wt% of second photopolymerization aid;
1 to 3 wt% of first acrylic monomer;
4 to 6 wt% of second acrylic monomer;
3 to 5 wt% of tertiary acrylic monomer;
11 to 13 wt% of quaternary acrylic monomer;
40-43 wt% epoxy acrylate;
3 to 5 wt% of trifunctional urethane acrylate;
0.1 to 2 wt% silicone acrylate;
0.1 to 1 wt% of polyether-modified polysiloxane;
0.1 to 1 wt% of second photoinitiator;
Dispersant 0.1 to 1 wt%;
4-6 wt% of storage stabilizer;
1 to 3 wt% of alicyclic epoxy resin;
1 to 3 wt% of glycidyl ether monomer;
1 to 3 wt% of first oxetane monomer;
0.5 to 1 wt% of second oxetane monomer;
0.1 to 1 wt% of a first cationic initiator; and
characterized by containing 0.1 to 1 wt% of a second cationic initiator;
Binder composition for screen printing of security products. delete delete In the first paragraph,
The above first photoinitiator comprises benzophenone,
The above first photopolymerization assistant comprises triethanolamine,
The above second photopolymerization assistant comprises benzyl dimethyl ketal,
The above first acrylic monomer comprises pentaerythritol polyethylene oxide tetraacrylate,
The second acrylic monomer comprises polyethylene glycol diacrylate,
The third acrylic monomer comprises 1,6-hexanediol diacrylate,
The fourth acrylic monomer is characterized in that it contains 4-hydroxybutylacrylate.
Binder composition for screen printing of security products. In the first paragraph,
The second photoinitiator is characterized in that it comprises trimethylbenzoyl diphenylphosphine oxide.
Binder composition for screen printing of security products. In the first paragraph,
The storage stabilizer is characterized by comprising 10 wt% of tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]methane, 45 wt% of 1,6-hexanediol diacrylate, and 45 wt% of 2-hydroxypropylacrylate.
Binder composition for screen printing of security products. In the first paragraph,
The above cycloaliphatic epoxy resin comprises 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate,
The above glycidyl ether monomer comprises 1,4-cyclohexanedimethanol diglycidyl ether,
The above first oxetane monomer comprises 3,3'-[oxybis(methylene)]bis[(3-ethyl)oxetane],
The above second oxetane monomer comprises 3-ethyl-3-oxetanemethanol,
The first cationic initiator comprises propylene carbonate and [(phenylthio)phenyl]diphenylsulfonium hexafluorophosphate,
The second cationic initiator is characterized in that it comprises propylene carbonate and diphenyl (4-phenylthiophenyl) sulfonium hexafluoroantimonate.
Binder composition for screen printing of security products. In the first paragraph,
The above security product is characterized by including at least one of banknotes, securities, ID cards, passports, identification cards, security documents, and security labels.
Binder composition for screen printing of security products.