KR20150108598A - Antireflection film with excellent curl and adhesive strength and methodee of manufacturing the same - Google Patents

Abstract

The present invention relates to a reflection preventing film and, more specifically, to a reflection preventing film having excellent curl and adhesive strength including a UV curable resin composition including senary to nonary functional oligomer and monomer of three types on at least one side of the triacetyl cellulose film, an initiator having short wavelength initiator and a long wavelength initiator mixed independently in 0.1 to 5% , and metal nano particles, and a UV hard coating layer manufactured by adding an acetate solvent to the UV curable resin composition. The antireflection film manufactured by the present invention has the curl of 1 mm or less, strength of 2H 4/5, and adhesion strength of 5B. The curl of the antireflection film has less curl of 1 mm or less compared with an existing film, and has excellent physical properties of strength of 2H 4/5, and adhesion strength of 5B.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antireflection film having excellent curl and adhesion properties, and an antireflection film having excellent curl and adhesive strength,

The present invention relates to an antireflection film, and more particularly, to an antireflection film comprising triacetyl cellulose film and triacetylcellulose film on at least one side thereof with 6- to 9-function oligomers and three monomers, wherein the short wavelength initiator and the long wavelength initiator are 0.1 To 5% by weight of a UV curable resin composition comprising metal nanoparticles and an UV hard coating layer prepared by adding an acetate solvent to the UV curable resin composition, and an antireflection film excellent in adhesion property will be.

The antireflection film produced by the present invention has a Curl of 1 mm or less, a hardness of 2H4 / 5, and an adhesion of 5B.

The antireflection film is a film for preventing reflection of light. For example, in the case of an antireflection film used in the visible light region, various display devices such as a plasma display panel (PDP) Is mounted at a position spaced a predetermined distance from the surface of the display device for the purpose of improving the contrast and image quality, and it is a component of an optical filter together with an optional absorption layer for improving color feeling and an electromagnetic wave shielding layer for shielding electromagnetic waves . In the case of an antireflection film used in the near-infrared region, it is widely used in various fields such as optical communication and optoelectronic devices.

A conventionally used triacetyl cellulose (TAC) film can be applied to various display panels such as a liquid crystal display (LCD), a plasma display (PDP), a cathode ray tube (CRT) And is widely used as a hard-coating film for surface protection. In addition, such a hard coating film imparts hard coatability to the surface to be protected, gives resistance to the indication by fingerprints, markers, and the like, and also easily removes contaminants when the surface to be protected is contaminated , That is, antifouling property.

In general, the coating means coating the surface of an object with another material, thereby protecting the coated object from external stimuli and preventing scratches, so that the appearance of the coated material can be kept clean for a long time.

As the polymer included in the conventional hard coating agent, an acrylic polymer, a urethane polymer, an epoxy polymer, a silicon polymer, or a silica compound is mainly used. These polymers exist in the form of monomers or oligomers, and a photoinitiator is added to them to form a polymeric material by heat or UV, resulting in hard coatability. In most of these coatings, the abrasion resistance increases as the crosslink density increases.

In order to consider the curl, hardness, and adhesion, UV-resin was prepared and used for the functional optical coating film. The physical properties of conventional hard coating products were 0B to 2B adhesion on air surface coating for Curl control. Therefore, studies have been made on cured hard coating films in consideration of the refractive index of Resin, the size of silica particles and the particle size distribution in order to secure low Curl and adhesion, and to control haze and visibility.

However, in the case of Curl, hardness, and adhesion properties, inversely proportional relation holds true, and therefore, it is a fact that the product is not actually produced.

Korean Registered Patent No. 1,127,952 Korean Patent Publication No. 10-2011-0035581

DISCLOSURE OF THE INVENTION The present invention has been conceived in order to solve the above-mentioned problems. It is an object of the present invention to provide a triacetyl cellulose acetate film which is excellent in erosion resistance The object of the present invention is to produce an antireflective tricellulose acetate film having a Curl hardness of not more than 1 mm and a hardness of 2H 4/5 and an adhesion force of 5B after using an acetate (acetate) solvent (Sovent).

It is also intended to apply the present invention to films (for example, AG, LR, AR for TV) in which optical characteristics and physical properties are important.

According to a preferred embodiment of the present invention, a triacetylcellulose film base, and

And a UV hard coating layer coated on at least one side of the triacetyl cellulose film substrate, wherein the UV hard coating layer comprises a solvent for the UV curable resin composition comprising 6- to 9-function oligomers and three monomers, metal nanoparticles and initiator And then coating the film on the triacetylcellulose film substrate to provide an antireflection film excellent in Curl and adhesive force characteristics.

According to another preferred embodiment of the present invention, there is provided an antireflection film excellent in Curl and adhesion properties, characterized in that the 6 to 9-functional oligomer and the monomer are blended in a weight ratio of 6: 4.

According to another preferred embodiment of the present invention, the initiator of the UV curable resin composition is composed of a short wavelength initiator and a long wavelength initiator, wherein the short wavelength initiator is 0.1 to 5% and the long wavelength initiator is 0.1 to 5%. An antireflection film excellent in characteristics is provided.

According to another preferred embodiment of the present invention, there is provided an antireflection film excellent in Curl and adhesion properties, characterized in that the solvent is acetate-based.

According to another preferred embodiment of the present invention, the antireflection film produced by the above method has a curl of 1 mm or less, a hardness of 2H 4/5, and an adhesion force of 5 B, and provides an antireflection film excellent in Curl and adhesive force characteristics do.

According to another preferred embodiment of the present invention, there is provided a process for producing a triacetylcellulose film, comprising the steps of: preparing a triacetylcellulose film; blending at least one side of the triacetylcellulose film with 6 to 9 functional oligomers and three monomers; There is provided a process for producing an antireflection film excellent in Curl and adhesive force characteristics, which comprises the steps of: preparing a UV-curable resin composition; and adding a solvent to the UV-curable resin composition to prepare a cured UV hard coat layer .

According to another preferred embodiment of the present invention, there is provided a process for producing an antireflection film excellent in Curl and adhesive force characteristics, wherein the 6 to 9-functional oligomer and the monomer are blended in a weight ratio of 6: 4.

According to another preferred embodiment of the present invention, the initiator of the UV curable resin composition comprises a short wavelength initiator and a long wavelength initiator, wherein the short wavelength initiator is 0.1 to 5% and the long wavelength initiator is 0.1 to 5%. A method for producing an antireflection film excellent in adhesion property is provided.

According to another preferred embodiment of the present invention, there is provided a process for producing an antireflection film excellent in Curl and adhesion properties, characterized in that the solvent is acetate-based.

The antireflection film produced by the method according to the present invention has Curl of 1 mm or less, curl less than conventional films, hardness of 2H 4/5, and adherence of 5B.

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood that the terms used in the embodiments of the present invention and the like are merely illustrative in order to facilitate understanding of the present invention and should not be construed as limiting the scope of the present invention.

Hereinafter, the present invention will be described in more detail with respect to each configuration.

(A) a triacetylcellulose film

In general, the film or substrate used in the hard coating film can be used without any particular limitation as long as it is a plastic film or a substrate conventionally used as a substrate. Concretely, there may be mentioned polyesters such as polyethylene terephthalate (PET), triacetylcellulose (TAC), cellulose ester, cycloolefin polymer (COP), cycloolefin copolymer (COC), polyacrylate, polycarbonate, A plastic film or a substrate produced by using a plastic resin such as polystyrene, polyolefin, polyethylene, polypropylene or polyvinyl chloride.

However, in the present invention, a triacetyl cellulose film is preferably used as the base material of the film or substrate used in the hard coating film.

(B) oligomers and monomers

In the present invention, it is preferable to mix oligomers having 6 to 9 carbons and monomers at a weight ratio of 6: 4.

When oligomers and monomers having 6 to 9 functions are used, oligomers and monomers having 6 or less functionalities or 9 or more functionalities are used, excellent surface hardness can be realized and scratch resistance is excellent, and Curl phenomenon .

Examples of the oligomers having 6 to 9 functional groups include urethane (meth) acrylate oligomers and polyester acrylate oligomers. More specific examples thereof include ethylenic double bonds such as (meth) acryloyl groups and vinyl allyl groups. A functional group having a bond, and the like are used, but the present invention is not limited thereto.

In the acrylate oligomer, the functional group means a reactive functional group. For example, the hexafunctional urethane acrylate oligomer contains a C = C bond included in each of six acrylate groups (-O-CO-H = CH2) can do.

Examples of the monomer include an isocyanate-based, acrylic-based, and acrylate-based monomer. More specific examples of the monomer include benzyl acrylate (BZA), benzyl methacrylate (BZMA) Phenoxy ethyl acrylate, 2-hydroxy-3-phenoxy propyl acrylate, phenylthioethyl acrylate, cumylphenoxy Phenyl phenoxy ethyl acrylate, 2-hydroxy-3-phenylphenoxy ethyl acrylate, 2-hydroxy-3-phenylphenoxy ethyl acrylate, propyl acrylate, 2-hydroxy-3-phenoxy propyl acrylate, 1,6-hexanediolpropane dimethylacrylate, phenoxy ethyl acrylate, (phenoxyethyl ac rylate, PHEA), 2-ethoxyethyl acrylate, isobornyl acrylate, pentaerythritol triacrylate (PETA), dipentaerythritol pentaacrylate ( dipentaerythritol pentaacrylate (DPPA), dipentaerythritol hexacrylate (DPHA), trimethylolpropane triacrylate (TMPTA), methyl acrylate, ethyl acrylate, butyl acrylate, and 2- 2-hydroxyethyl acrylate (HEA), and the like, but the present invention is not limited thereto.

Hereinafter, the UV curable resin composition comprising the metal nanoparticles, the initiator and the solvent will be described in more detail.

(C) metal nanoparticles

Specific examples of the metal nanoparticles include, but are not limited to, silica, titanium oxide, indium tin oxide, antimony tin oxide, and the like.

(D) initiator

Typically, the initiator may be Irgacure, Darocure series from Ciba Specialty Chemicals, Syracur series from Dow Chemical, and the like. Typical examples thereof include Irgacure 184 of Ciba Specialty and Irgacure 819 as a long wavelength initiator. But is not limited thereto.

The initiator used in the present invention is 0.1 to 5% of the short wavelength initiator and 0.1 to 0.5% of the long wavelength initiator based on the UV curable resin composition, respectively.

(E) Solvent

The solvent used in the present invention is preferably a solvent of high boiling point and an acetate solvent which gives erosion to the triacetylcellulose film.

The antireflection film of the present invention comprises the steps of: preparing a triacetylcellulose film; Mixing at least one side of the triacetylcellulose film with 6- to 9-fold oligomers and three monomers; Preparing a UV curable resin composition comprising a metal nanoparticle and an initiator; And adding a solvent to the UV curable resin composition to prepare a cured UV hard coat layer.

The antireflection film produced by the present invention is a film having a hardness of 2 mm or less and a hardness of 2H 4/5, preferably 1 mm or less, a hardness of 3 H 3/5, and an adhesion of 5 B, and having high hardness and high adhesion.

The antireflection film of the present invention can be used in various fields such as AG, LR and AR film for TV.

Hereinafter, the present invention will be described in more detail by way of examples. However, these embodiments are for illustrative purposes only and the invention is not limited thereto.

Example 1

Three kinds of hexafunctional oligomers and monomers were blended, and then UV curable hard coating compositions were prepared by mixing Irgacure 184 of Ciba Specialty and 0.2% Irgacure 819 as long wavelength initiators as short wavelength initiators.

Acetate-based solvent was added to the prepared UV-curable hard coating composition and applied on the triacetylcellulose film substrate.

Comparative Example 1

The procedure of Example 1 was repeated except that the oligomers and monomers having six functional groups were bifunctional.

<Measurement method>

(1) Curl

The film was heat-treated at 150 ° C for 30 minutes, cut into a cross shape with a size of 10 cm x 10 cm, and then the height at which the film at the cut portion came up was measured.

(2) Pencil hardness

Based on ASTM D3363, a pencil hardness meter was used to measure the surface of the coated surface five times under a load of 0.5 kg and 10 mm.

Example 1 Comparative Example 1 Sensuality 6 2 Curl 2 mm or less 20mm Hardness 3H 3/5 2H 1 to 2/5 S / W 1-2 2 to 3

As shown in Table 1, Example 1 had an effect of 10 times or more in the case of Curl, and that in the case of hardness was stronger than 1H. In addition, it was found that scratch resistance was improved in the S / W evaluation.

Claims (9)

Triacetylcellulose film substrate; And
A UV hard coating layer coated on at least one side of the triacetyl cellulose film substrate,
Wherein the UV hard coat layer is formed by applying a solvent to a UV curable resin composition comprising 6 to 9 oligomers and 3 monomers, metal nanoparticles and an initiator and applying the solvent on the triacetyl cellulose film substrate. Antireflection film excellent in adhesion property. The method according to claim 1,
Wherein the 6 to 9 functional oligomers and the monomers are blended in a weight ratio of 6: 4. The method according to claim 1,
Wherein the initiator of the UV curable resin composition comprises a short wavelength initiator and a long wavelength initiator, wherein the short wavelength initiator is 0.1 to 5% and the long wavelength initiator is 0.1 to 5%. The method according to claim 1,
Wherein the solvent is an acetate-based antireflection film excellent in Curl and adhesion properties. The antireflection film produced by the method of claim 1, wherein the Curl is 1 mm or less, the hardness is 2H 4/5, and the adhesion is 5B. Preparing a triacetylcellulose film;
Mixing at least one side of the triacetylcellulose film with 6- to 9-fold oligomers and three monomers;
Metal nanoparticles, and an initiator; and
And adding a solvent to the UV curable resin composition to prepare a cured UV hard coat layer. The method according to claim 6,
Wherein the 6 to 9 functional oligomers and the monomers are blended in a weight ratio of 6: 4. The method according to claim 6,
Wherein the initiator of the UV curable resin composition comprises a short wavelength initiator and a long wavelength initiator, the short wavelength initiator is 0.1 to 5%, and the long wavelength initiator is 0.1 to 5%. . The method according to claim 6,
Wherein the solvent is an acetate-based solvent.