KR20160117866A - Adhesive composition, adhesive film prepared using the same and optical display apparatus comprising the same - Google Patents
Adhesive composition, adhesive film prepared using the same and optical display apparatus comprising the same Download PDFInfo
- Publication number
- KR20160117866A KR20160117866A KR1020150045767A KR20150045767A KR20160117866A KR 20160117866 A KR20160117866 A KR 20160117866A KR 1020150045767 A KR1020150045767 A KR 1020150045767A KR 20150045767 A KR20150045767 A KR 20150045767A KR 20160117866 A KR20160117866 A KR 20160117866A
- Authority
- KR
- South Korea
- Prior art keywords
- meth
- pressure
- sensitive adhesive
- adhesive composition
- weight
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- C09J7/02—
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
-
- C09J2201/622—
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Nonlinear Science (AREA)
- Organic Chemistry (AREA)
- Mathematical Physics (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Adhesive Tapes (AREA)
Abstract
(Meth) acrylic copolymer and a (meth) acrylic monomer having a weight average molecular weight of 600,000 g / mol to 150,000 g / mol, wherein the sum of the (meth) acrylic copolymer and the Wherein the pressure-sensitive adhesive composition is a pressure-sensitive adhesive composition comprising 5 to 40 parts by weight of the (meth) acrylic copolymer and 60 to 95 parts by weight of the (meth) acrylic monomer, , The pressure-sensitive adhesive composition has an elongation after curing of not less than 500%, an adhesive film formed therefrom, and an optical display device comprising the same.
Description
The present invention relates to a pressure-sensitive adhesive composition, a pressure-sensitive adhesive film formed therefrom, and an optical display device including the same.
The liquid crystal display device includes a liquid crystal panel and a polarizing plate. A liquid crystal panel, a polarizing plate and the like can be easily broken by an external impact. The liquid crystal display device may further include a functional film such as an antireflection film and an anti-glare film on the entire surface in order to protect the liquid crystal panel and the polarizing plate from external impact and improve the outdoor visibility.
As a method for filling between a polarizing plate and a functional film in a liquid crystal display device, there is a method of coating a liquid photo-curable pressure-sensitive adhesive composition and curing it. However, in a liquid phase photo-curable pressure sensitive adhesive composition having a high hardening shrinkage ratio, lifting between polarizing plates and functional films may occur. However, if the curing shrinkage ratio is lowered, the curing rate may be lowered, and the polarizing plate or the functional film may not be sufficiently filled.
Also, in the organic light emitting element display device, a liquid photo-curable pressure sensitive adhesive composition can be applied between the polarizing plate, the conductor and the window film, and cured to adhere. Also in this case, it may be a problem when the curing shrinkage ratio of the liquid photocurable pressure-sensitive adhesive composition is large and the curing rate is low.
Prior art related to this is disclosed in Korean Patent Publication No. 2007-0055363.
A problem to be solved by the present invention is to provide a pressure-sensitive adhesive composition having a hardening shrinkage of not more than 3% and an elongation after hardening of not less than 500%.
Another problem to be solved by the present invention is to provide a pressure-sensitive adhesive composition capable of realizing a pressure-sensitive adhesive film having a high photo-curability and a high durability.
Another problem to be solved by the present invention is to provide a pressure-sensitive adhesive composition which has little spillover upon application.
The pressure sensitive adhesive composition of the present invention comprises a (meth) acrylic copolymer and a (meth) acrylic monomer having a weight average molecular weight of 600,000 g / mol to 1,500,000 g / mol, wherein the (meth) (Meth) acryl-based copolymer and 60 to 95 parts by weight of the (meth) acryl-based monomer in 100 parts by weight of the sum of the acrylic monomer, the pressure-sensitive adhesive composition having a curing shrinkage ratio 3% or less, and the pressure-sensitive adhesive composition may have an elongation after curing of 500% or more:
<Formula 1>
Cure shrinkage ratio = (B-A) / B x 100
(In the above formula 1, A and B are as defined in the detailed description of the present invention).
The pressure-sensitive adhesive composition of the present invention comprises a (meth) acrylic copolymer having a weight average molecular weight of 600,000 g / mol to 150,000 g / mol and a (meth) acrylic acid ester polymer having an unsubstituted C14- (Meth) acryl-based copolymer in 100 parts by weight of the sum of the (meth) acrylic copolymer and the (meth) acrylic monomer, and the pressure-sensitive adhesive composition comprises 5 to 40 parts by weight of the The viscosity may be from 5,000 cps to 10,000 cps.
The pressure-sensitive adhesive film of the present invention may be formed of the pressure-sensitive adhesive composition.
The optical display device of the present invention may include the above-mentioned pressure-sensitive adhesive film.
The present invention provides a pressure-sensitive adhesive composition having a hardening shrinkage of 3% or less and an elongation after hardening of 500% or more.
The present invention provides a pressure-sensitive adhesive composition capable of realizing a pressure-sensitive adhesive film having a high curing rate and high durability.
The present invention provides a pressure-sensitive adhesive composition having less overflow at the time of application.
As used herein, "(meth) acrylic" means acrylic and / or methacrylic.
As used herein, the "hardening shrinkage ratio" is the density (A, unit: g / cm 3 ) of the pressure-sensitive adhesive composition for 10 g of the pressure-sensitive adhesive composition using a specific weight cup. 10 g of the pressure-sensitive adhesive composition was applied to a polyethylene terephthalate film as a release film and UV was irradiated for 3 minutes at an intensity of 20 mW / cm 2 to produce a pressure-sensitive adhesive film having a thickness of 200 탆. The density (B, unit: g / cm < 3 >) of the pressure-sensitive adhesive film relative to the pressure-sensitive adhesive film was determined using a specific weight cup. The hardening shrinkage ratio is calculated by the following formula 1:
<Formula 1>
Cure shrinkage ratio = (B-A) / B x 100
(Density of the pressure-sensitive adhesive film prepared by curing 10 g of the pressure-sensitive adhesive composition at an intensity of 20 mW / cm 2 of UV for 3 minutes)
As used herein, "elongation" is a value measured by the ASTM D638 method for an adhesive film specimen.
Hereinafter, a pressure-sensitive adhesive composition according to an embodiment of the present invention will be described.
The pressure-sensitive adhesive composition according to one embodiment of the present invention comprises a (meth) acrylic copolymer and a (meth) acrylic monomer having a weight average molecular weight of 600,000 g / mol to 1,500,000 g / mol, And the (meth) acrylic monomer may be contained in an amount of 5 to 40 parts by weight, based on 100 parts by weight of the sum of the (meth) acrylic monomer. Also, the pressure-sensitive adhesive composition according to one embodiment of the present invention may have a viscosity of 5,000 cps to 10,000 cps at 25 ° C. When the pressure-sensitive adhesive composition is cured, the curing shrinkage rate may be 3% or less in the weight average molecular weight, the content of the (meth) acrylic copolymer and the viscosity, and the light curing rate of the pressure-sensitive adhesive composition may be increased and the elongation may be 500% or more. In addition, the pressure-sensitive adhesive film prepared by applying and curing the pressure-sensitive adhesive composition to a panel or a touch panel in the weight-average molecular weight, the content of the (meth) acrylic copolymer and the viscosity range is free from yellowing and yellowing due to curing shrinkage, There may be no overflow. When the curing shrinkage ratio of the pressure-sensitive adhesive composition is 3% or less, the pressure-sensitive adhesive film formed from the pressure-sensitive adhesive composition can be free from peeling between the polarizing plate and the functional film.
Specifically, the (meth) acrylic copolymer may have a weight average molecular weight of 700,000 g / mol to 1,000,000 g / mol. Specifically, the (meth) acrylic copolymer may be contained in an amount of 10 to 20 parts by weight based on 100 parts by weight of the sum of the (meth) acrylic copolymer and the (meth) acrylic monomer. Specifically, the pressure-sensitive adhesive composition may have a viscosity of 6,000 cps to 9,500 cps at 25 占 폚.
The (meth) acrylic copolymer may include a linear (meth) acrylic copolymer. As used herein, "linear (meth) acrylic copolymer" means a non-crosslinked (meth) acrylic copolymer.
(Meth) acrylic copolymer may have a glass transition temperature (Tg) of -100 ° C to -10 ° C, specifically -50 ° C to -15 ° C. Within this range, there can be an effect of excellent adhesion.
The (meth) acrylic monomer can crosslink the (meth) acrylic polymer upon curing of the pressure-sensitive adhesive composition to form an adhesive film, thereby increasing the curing rate of the pressure-sensitive adhesive composition and increasing the degree of crosslinking of the pressure-sensitive adhesive film.
The (meth) acrylic monomer may be contained in an amount of 60 to 95 parts by weight based on 100 parts by weight of the sum of the (meth) acrylic copolymer and the (meth) acrylic monomer. Within this range, the curing shrinkage ratio of the pressure-sensitive adhesive composition is 3% or less, thereby increasing the curing rate of the pressure-sensitive adhesive composition and increasing the degree of crosslinking of the pressure-sensitive adhesive film. Specifically, the (meth) acrylic monomer may be contained in an amount of 80 to 90 parts by weight based on 100 parts by weight of the sum of the (meth) acrylic copolymer and the (meth) acrylic monomer.
The mixture of the (meth) acrylic copolymer and the (meth) acrylic monomer can be prepared by partially polymerizing the monomer mixture without completely polymerizing the monomer mixture. Specifically, it can be produced by polymerizing a monomer mixture for a (meth) acrylic copolymer at a polymerization degree of less than 40%, for example, from 5% to 35%. As a result, 5 parts by weight to 40 parts by weight of the (meth) acrylic copolymer and 60 to 95 parts by weight of the (meth) acrylic monomer were contained in 100 parts by weight of the sum of the (meth) acrylic copolymer and the (meth) , A pressure-sensitive adhesive composition having a low hardening shrinkage percentage and a hardening elongation of 500% or higher can be produced. The degree of polymerization can be measured by conventional methods known to those skilled in the art.
As a method of producing a mixture of the (meth) acrylic copolymer and the (meth) acrylic monomer, refer to the production method of the pressure-sensitive adhesive composition described below.
The monomer mixture for the mixture of the (meth) acrylic copolymer and the (meth) acrylic monomer may comprise a (meth) acrylic acid ester having an unsubstituted C14 to C20 alkyl group.
The (meth) acrylic acid ester having an unsubstituted C14 to C20 alkyl group can lower the curing shrinkage of the pressure-sensitive adhesive composition to 3% or less by providing an unsubstituted C14 to C20 alkyl group, and the elongation of the pressure-sensitive adhesive film to 500% And yellowing due to curing shrinkage can be removed. Specifically, the unsubstituted C14 to C20 alkyl group is branched so that the curing shrinkage ratio of the pressure-sensitive adhesive composition can be further lowered.
(Meth) acrylic acid esters having an unsubstituted C14 to C20 alkyl group include (meth) acrylic acid esters having an unsubstituted C14 alkyl group, (meth) acrylic acid esters having an unsubstituted C15 alkyl group, an unsubstituted C16 alkyl group (Meth) acrylic esters having an unsubstituted C17 alkyl group, (meth) acrylic esters having an unsubstituted C18 alkyl group, (meth) acrylic esters having an unsubstituted C18 alkyl group, (Meth) acrylic acid esters having an unsubstituted C20 alkyl group. More specifically, the (meth) acrylic acid ester having an unsubstituted C14 to C20 alkyl group may be isostearyl (meth) acrylate. These may be included singly or in combination of two or more.
The (meth) acrylic ester having an unsubstituted C14 to C20 alkyl group may be contained in an amount of 10 to 30% by weight, specifically 10 to 20% by weight, based on the solids content of the monomer mixture. Within this range, the curing shrinkage ratio of the pressure-sensitive adhesive composition may be 3% or less, and the light-curing rate of the pressure-sensitive adhesive composition may be increased.
The monomer mixture for the (meth) acrylic copolymer and the (meth) acrylic monomer is a (meth) acrylic ester having an unsubstituted C1 to C13 alkyl group, a (meth) acrylic monomer having a hydroxyl group, And may further include monomers.
The (meth) acrylic acid ester having an unsubstituted C1 to C13 alkyl group can improve the adhesive property of the pressure-sensitive adhesive film made of the pressure-sensitive adhesive composition. Specifically, the (meth) acrylic esters having an unsubstituted C1 to C13 alkyl group include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (Meth) acrylate, isobutyl (meth) acrylate, isobutyl (meth) acrylate, pentyl (meth) acrylate, (Meth) acrylate, isooctyl (meth) acrylate, nonyl (meth) acrylate, decyl (meth) acrylate and lauryl (meth) acrylate. These may be included singly or in combination of two or more. More specifically, the (meth) acrylic acid ester having an unsubstituted C1 to C13 alkyl group is a branched (meth) acrylic acid ester, and thus a (meth) acrylic acid ester having an unsubstituted C14 to C20 alkyl group The compatibility may be good.
(Meth) acrylic acid ester having an unsubstituted C1 to C13 alkyl group is contained in an amount of 50 to 80% by weight, specifically 50 to 75% by weight, more specifically 55 to 75% by weight, ≪ / RTI > Within this range, the curing shrinkage ratio of the pressure-sensitive adhesive composition can be 3% or less, and the pressure-sensitive adhesive property of the pressure-sensitive adhesive film can be secured.
The (meth) acrylic monomer having a hydroxyl group can increase the degree of crosslinking upon curing of the pressure-sensitive adhesive composition by providing at least one hydroxyl group. The (meth) acrylic monomer having a hydroxyl group may include a (meth) acrylic acid ester having a C1 to C20 alkyl group having at least one hydroxyl group. Specifically, the (meth) acrylic monomers having a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2- hydroxypropyl (meth) (Meth) acrylate, 6-hydroxyhexyl (meth) acrylate ≪ / RTI > These may be included singly or in combination of two or more.
The (meth) acrylic monomer having a hydroxyl group may be contained in an amount of 5% by weight to 30% by weight, specifically 15% by weight to 25% by weight, based on the solids content of the monomer mixture. Within this range, the curing shrinkage ratio of the pressure-sensitive adhesive composition can be 3% or less, and the curing rate of the pressure-sensitive adhesive composition can be increased.
The (meth) acrylic monomer having an alicyclic group can increase the adhesive force of the pressure-sensitive adhesive film when the pressure-sensitive adhesive composition is cured. The (meth) acrylic monomer having an alicyclic group may include a (meth) acrylic monomer having an unsubstituted C3 to C10 alicyclic group. Specifically, the (meth) acrylic monomer having an alicyclic group may include at least one of cyclopentyl (meth) acrylate, cyclohexyl (meth) acrylate, and isobornyl (meth) acrylate. These may be included singly or in combination of two or more.
The (meth) acrylic monomer having an alicyclic group may be contained in an amount of 5% by weight to 25% by weight, specifically 10% by weight to 20% by weight, based on the solids content of the monomer mixture. Within this range, the curing shrinkage of the pressure-sensitive adhesive composition may be 3% or less, and the adhesive force of the pressure-sensitive adhesive film may be good.
In one embodiment, the monomer mixture comprises 10% to 30% by weight of a (meth) acrylic acid ester having an unsubstituted C14 to C20 alkyl group, 50% to 50% by weight of a (meth) acrylic acid ester having an unsubstituted C1- 5 to 30% by weight of a (meth) acrylic monomer having a hydroxyl group and 5 to 25% by weight of a (meth) acrylic monomer having an alicyclic group.
The monomer mixture for the (meth) acrylic copolymer and the (meth) acrylic monomer may further comprise a (meth) acrylic monomer having a heteroalicyclic group.
The (meth) acrylic monomer having a hetero-alicyclic group may be included in the pressure-sensitive adhesive composition to reduce the hardening shrinkage or increase the adhesion. The (meth) acrylic monomer having a hetero-alicyclic group may include unsubstituted (meth) acrylic acid esters having a C2 to C10 heteroalicyclic group having nitrogen, oxygen, or sulfur. Specifically, the (meth) acrylic monomer having a hetero-alicyclic group may include (meth) acryloylmorpholine. These may be included singly or in combination of two or more.
The (meth) acrylic monomer having a hetero-alicyclic group may be contained in an amount of 1 to 25% by weight, specifically 1 to 10% by weight based on the solid content of the monomer mixture. Within this range, there may be an effect of increasing the adhesion and reducing the hardening shrinkage.
In one embodiment, the monomer mixture comprises 10% to 30% by weight of a (meth) acrylic acid ester having an unsubstituted C14 to C20 alkyl group, 50% to 50% by weight of a (meth) acrylic acid ester having an unsubstituted C1- (Meth) acrylic monomer having a hydroxyl group, 5 to 30% by weight of a (meth) acrylic monomer having a hydroxyl group, 5 to 25% by weight of a (meth) acrylic monomer having an alicyclic group, By weight to 25% by weight.
(Meth) acrylic monomer, the (meth) acrylic acid ester having an unsubstituted C14 to C20 alkyl group, the (meth) acrylic acid ester having an unsubstituted C1 to C13 alkyl group, the (meth) acrylic monomer having a hydroxyl group, and And a mixture of (meth) acrylic monomers having an alicyclic group.
The (meth) acrylic monomer may further include a (meth) acrylic monomer having the above-mentioned heteroalicyclic group.
The pressure-sensitive adhesive composition may further include an initiator.
The initiator may crosslink the pressure-sensitive adhesive composition by crosslinking the (meth) acrylic polymer and the (meth) acrylic monomer. The initiator may include one or more of phosphorous, benzoin, and the like. These may be included singly or in combination of two or more.
The initiator may be included in an amount of 0.1 part by weight to 3 parts by weight, specifically 0.5 parts by weight to 2 parts by weight, based on 100 parts by weight of the mixture (sum) of the (meth) acrylic copolymer and the (meth) acrylic monomer. Within the above range, the mixture of the (meth) acrylic polymer and the (meth) acrylic monomer can be sufficiently cured, and the remaining amount of the initiator can be prevented from lowering the transparency of the adhesive film.
The pressure-sensitive adhesive composition may further include a silane coupling agent.
The silane coupling agent can increase the adhesive strength of the pressure-sensitive adhesive film produced from the pressure-sensitive adhesive composition. The silane coupling agent may comprise conventional tackifiers known to those skilled in the art. Specifically, the silane coupling agent is an epoxy group-containing silane compound such as 3-glycidoxypropyltrimethoxysilane and 3-glycidoxypropylmethyldimethoxysilane; Silane compounds containing polymerizable unsaturated groups such as vinyltrimethoxysilane and (meth) acryloyloxypropyltrimethoxysilane; Amino group-containing silane compounds such as 3-aminopropyltrimethoxysilane and N- (2-aminoethyl) -3-aminopropyltrimethoxysilane; And mercapto group-containing silane compounds such as 3-mercaptopropyltrimethoxysilane.
The silane coupling agent may be contained in an amount of 0.01 to 15 parts by weight, specifically 0.01 to 5 parts by weight, based on 100 parts by weight of the mixture (sum) of the (meth) acrylic copolymer and the (meth) acrylic monomer. In the above range, the pressure-sensitive adhesive film made of the pressure-sensitive adhesive composition may have good adhesion.
The pressure-sensitive adhesive composition may further include conventional additives included in the pressure-sensitive adhesive composition. The additives may include, but are not limited to, antifoaming agents, leveling agents, antistatic agents, and the like. The additive may be added in an amount of 0.0001 to 5 parts by weight, specifically 0.001 to 1 part by weight based on 100 parts by weight of the mixture (sum) of the (meth) acrylic copolymer and the (meth) acrylic monomer. In the above range, the pressure-sensitive adhesive film made of the pressure-sensitive adhesive composition may have good adhesion.
The pressure-sensitive adhesive composition may be a solvent-free solventless type.
The pressure-sensitive adhesive composition may have a hardening shrinkage of 3% or less, specifically 0.1% to 2%. Within the above range of curing shrinkage, even when the pressure-sensitive adhesive composition is cured when used in an optical display device, there may be no peeling between the panel, the polarizing plate, the functional film, or the conductive layer.
Hereinafter, a method for producing a pressure-sensitive adhesive composition according to an embodiment of the present invention will be described.
The pressure-sensitive adhesive composition according to one embodiment of the present invention is prepared by preparing a mixture of a (meth) acrylic copolymer and a (meth) acrylic monomer having a weight average molecular weight of 600,000 g / mol to 1,500,000 g / mol and adding an initiator ≪ / RTI >
A mixture of a (meth) acrylic copolymer and a (meth) acrylic monomer having a weight average molecular weight of 600,000 g / mol to 150,000 g / mol is added to the monomer mixture for the (meth) acrylic copolymer and the (meth) And then partially polymerizing the monomer mixture by irradiation with an initiator at 0.5 mW / cm 2 to 20 mW / cm 2 at an UV wavelength. The initiator may be included in an amount of 0.01 to 3 parts by weight, specifically 0.01 to 1.5 parts by weight based on 100 parts by weight of the monomer mixture. (Meth) acryl-based monomer mixture having a weight average molecular weight of 600,000 g / mol to 150,000 g / mol without the monomer mixture being completely polymerized in the above UV intensity, time and initiator range can do. The initiator may include one or more of phosphorous, benzoin, and the like. These may be included singly or in combination of two or more.
Then, an initiator was added to a mixture of a (meth) acrylic copolymer and a (meth) acrylic monomer having a weight average molecular weight of 600,000 g / mol to 1,500,000 g / mol to prepare a pressure- . At this time, it may further include adding a silane coupling agent and a conventional additive to the pressure-sensitive adhesive composition.
Hereinafter, an adhesive film according to an embodiment of the present invention will be described.
The adhesive film may have a elongation of 500% or more, specifically 500% to 1500%, more specifically 500% to 700%. Within this range, there may be an effect of controlling the shrinkage of the adhesive film.
The adhesive film may be optically transparent. Specifically, the adhesive film may have a light transmittance of 90% or more, specifically 90% to 99% at a wavelength of 380 nm to a wavelength of 780 nm. Specifically, the adhesive film may have a haze of 1% or less, specifically 0.1% to 1% at a wavelength of 380 nm to a wavelength of 780 nm. The light transmittance and the haze range can be used in an optical display device.
The adhesive film can be prepared by curing the pressure-sensitive adhesive composition according to one embodiment of the present invention. Specifically, the pressure-sensitive adhesive film can be prepared by applying a pressure-sensitive adhesive composition according to one embodiment of the present invention to a release film (e.g., a polyethylene terephthalate film) or a glass to a predetermined thickness and irradiating UV light. UV irradiation can be performed for 2 to 6 minutes at a dose of 10 mW / cm 2 to 30 mW / cm 2 . Within this range, the pressure-sensitive adhesive composition can be sufficiently cured, and the increase in surface roughness of the pressure-sensitive adhesive film due to the hardening can be suppressed. UV irradiation may further increase the curing rate by blocking the contact of oxygen by covering a releasing film (e.g., polyethylene terephthalate film) or glass over the pressure sensitive adhesive composition.
The adhesive film is an adhesive layer adhered to one side or both sides of an optical film and can be used for attaching glass, a substrate, an electrode of a touch panel, an LCD / OLED module, a touch panel, an optical film and the like to each other. The optical film may be at least one selected from the group consisting of a touch panel, a window, a polarizing plate, a color filter, a retardation film, an elliptically polarizing film, a reflection film, an antireflection film, a compensation film, a brightness enhancement film, A substrate including an LCD substrate, an indium tin oxide (ITO), a fluorinated tin oxide (FTO), an aluminum doped zinc oxide (AZO), a film containing a carbon nanotube (CNT), a film containing Ag nanowire or a graphene And an electrode film.
Hereinafter, an optical display device according to an embodiment of the present invention will be described.
The optical display device according to an embodiment of the present invention may include an adhesive film formed of a pressure-sensitive adhesive composition according to an embodiment of the present invention. Specifically, the optical display device may include a liquid crystal display device, an organic light emitting element display device, and the like.
Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It should be understood, however, that the same is by way of illustration and example only and is not to be construed in any way as limiting the invention.
Example 1
In the reactor, 60 parts by weight of 2-ethylhexyl acrylate, 20 parts by weight of 2-hydroxyethyl acrylate, 10 parts by weight of isostearyl acrylate and 10 parts by weight of isobornyl acrylate were mixed to prepare a monomer mixture. To the monomer mixture was added 0.04 parts by weight of initiator Irgacure 651 (Ciba). The oxygen in the reactor was replaced with nitrogen. The monomer mixture was partially polymerized by irradiation with UV light at an intensity of 10 mW / cm < 2 > for 3 minutes to obtain a mixture of the (meth) acrylic copolymer and the un polymerized (meth) acrylic monomer. The obtained mixture was analyzed. As a result, the content of the (meth) acrylic copolymer in Table 1 was obtained.
Then, 1.5 parts by weight of initiator Irgacure 651 (Ciba), 0.1 part by weight of silane coupling agent KBM-403 and 0.01 part by weight of antifoaming agent BYK-A-515 were further added to prepare a pressure-sensitive adhesive composition.
Example 2
A reactor was charged with 58 parts by weight of 2-ethylhexyl acrylate, 20 parts by weight of 2-hydroxyethyl acrylate, 10 parts by weight of isostearyl acrylate, 10 parts by weight of isobornyl acrylate and 2 parts by weight of acryloylmorpholine To prepare a monomer mixture. To the monomer mixture, 0.04 parts by weight of initiator Irgacure 651 (Ciba) was further added. The oxygen in the reactor was replaced with nitrogen. The monomer mixture was partially polymerized by irradiation with UV light at an intensity of 10 mW / cm < 2 > for 3 minutes to obtain a mixture of the (meth) acrylic copolymer and the un polymerized monomers. The obtained mixture was analyzed. As a result, the content of the (meth) acrylic copolymer in Table 1 was obtained.
Then, 1.5 parts by weight of initiator Irgacure 651 (Ciba), 0.1 part by weight of silane coupling agent KBM-403 and 0.01 part by weight of defoaming agent BYK-A-515 were added to prepare a pressure-sensitive adhesive composition.
Comparative Example 1
In the reactor, 25 parts by weight of 2-ethylhexyl acrylate and 75 parts by weight of 2-hydroxyethyl acrylate were mixed to prepare a monomer mixture. To the monomer mixture, 0.04 part by weight of initiator Irgacure 651 (manufactured by Ciba) was further added. The oxygen in the reactor was replaced with nitrogen. The monomer mixture was partially polymerized by irradiation with UV light at an intensity of 10 mW / cm < 2 > for 3 minutes to obtain a mixture of the (meth) acrylic copolymer and the un polymerized monomers. The obtained mixture was analyzed. As a result, the content of the (meth) acrylic copolymer in Table 1 was obtained.
Then, 1.5 parts by weight of initiator Irgacure 651 (Ciba), 0.1 part by weight of silane coupling agent KBM-403 and 0.01 part by weight of defoaming agent BYK-A-515 were added to prepare a pressure-sensitive adhesive composition.
The properties of the pressure-sensitive adhesive compositions of Examples and Comparative Examples were evaluated as shown in Table 1 below.
(g / in)
As shown in Table 1, the pressure-sensitive adhesive composition according to an embodiment of the present invention has a low hardening shrinkage rate of 3% or less, low volatility after curing of the pressure-sensitive adhesive composition, and good durability without lifting.
On the other hand, in Comparative Example 1, the hardening shrinkage ratio was high.
In addition, although not shown in Table 1, the pressure-sensitive adhesive composition according to an embodiment of the present invention has a low hardening shrinkage after UV irradiation after laminating on a display panel, and no mura is generated. On the other hand, Comparative Example 1 has a high hardening shrinkage ratio, which causes a problem of occurrence of mura due to hardening shrinkage.
≪ Property evaluation method &
(1) Weight average molecular weight of (meth) acrylic copolymer: The gel permeation chromatography using tetrahydrofuran as a solvent was used for the pressure-sensitive adhesive composition, and the weight average molecular weight of the (meth) acrylic copolymer Were measured.
(2) Viscosity of the pressure-sensitive adhesive composition: The pressure-sensitive adhesive composition was measured at 25 캜 using a Brookfield viscometer LV-II apparatus.
(3) Cure shrinkage ratio of pressure-sensitive adhesive composition: The density (A, unit: g / cm 3 ) of the pressure-sensitive adhesive composition was determined using a specific weight cup for 10 g of the pressure-sensitive adhesive composition. 10 g of the pressure-sensitive adhesive composition was applied to a polyethylene terephthalate film as a release film and UV was irradiated for 3 minutes at an intensity of 20 mW / cm 2 to produce a pressure-sensitive adhesive film having a thickness of 200 탆. The density (B, unit: g / cm < 3 >) of the pressure-sensitive adhesive film was determined using a specific gravity cup for the pressure-sensitive adhesive film. The hardening shrinkage was calculated by the following formula 1.
<Formula 1>
Cure shrinkage ratio = (B-A) / B x 100
(Density of the pressure-sensitive adhesive film prepared by curing 10 g of the pressure-sensitive adhesive composition at an intensity of 20 mW / cm 2 of UV for 3 minutes)
(4) Haze and light transmittance of the pressure-sensitive adhesive film: 10 g of the pressure-sensitive adhesive composition was applied to a polyethylene terephthalate film (thickness: 50 탆) as a release film and irradiated with UV at an intensity of 20 mW / cm 2 for 3 minutes, An adhesive film having a thickness of 200 mu m was produced. The haze and light transmittance of the resulting adhesive film were measured with a haze meter (NIPPON DENSHOKU NDH-5000).
(5) Elongation at break: curing the pressure-sensitive adhesive composition is irradiated for 3 minutes for laminating a polyethylene terephthalate coated with a pressure-sensitive adhesive composition on the film, and polyethylene terephthalate film to the coated pressure-sensitive adhesive composition again, and UV in intensity of 20mW / cm 2 To prepare a specimen having a thickness of 1 mm on the adhesive film. The pressure-sensitive adhesive film specimens excluding the polyethylene terephthalate film were measured by ASTM D638.
6 Peel Strength: The pressure-sensitive adhesive composition 10g a release film of polyethylene terephthalate film (thickness: 50㎛) UV coating and an adhesive film of 20mW / cm investigated 200㎛ thickness on a release film for 3 minutes to 2 intensity of the . An indium tin oxide (ITO) film was attached on the adhesive film, and the peel strength was measured at 300 mm / min using a TA.XT_PLUS Texture Analyzer (Stable Micro System) 30 minutes after the attachment.
(7) Durability: 10 g of the pressure-sensitive adhesive composition was coated on a glass plate, another glass plate was laminated, and UV was irradiated for 3 minutes at an intensity of 20 mW / cm 2 to obtain a specimen having a thickness of 200 탆. The specimens were allowed to stand at 60 DEG C and 90% relative humidity for 500 hours, and visually evaluated for lifting and bubbling on the glass plate surface. And when the bubbles were not generated, it was evaluated as good, when the bubbles were generated, and when the bubbles were generated.
While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the embodiments described above are in all respects illustrative and not restrictive.
Claims (18)
5 to 40 parts by weight of the (meth) acrylic copolymer and 60 to 95 parts by weight of the (meth) acrylic monomer in 100 parts by weight of the sum of the (meth) acrylic copolymer and the (meth) ,
The pressure-sensitive adhesive composition preferably has a curing shrinkage of 3% or less in the following formula (1)
<Formula 1>
Cure shrinkage ratio = (BA) / B x 100
(Density of the pressure-sensitive adhesive film prepared by curing 10 g of the pressure-sensitive adhesive composition at an intensity of 20 mW / cm 2 of UV for 3 minutes)
Wherein the pressure-sensitive adhesive composition has an elongation after curing of 500% or more.
The amount of the (meth) acrylic copolymer in the total amount of 100 parts by weight of the (meth) acrylic copolymer and the (meth) acrylic monomer is 5 parts by weight to 40 parts by weight,
Wherein the pressure-sensitive adhesive composition has a viscosity of 5,000 cps to 10,000 cps at 25 占 폚.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150045767A KR20160117866A (en) | 2015-03-31 | 2015-03-31 | Adhesive composition, adhesive film prepared using the same and optical display apparatus comprising the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150045767A KR20160117866A (en) | 2015-03-31 | 2015-03-31 | Adhesive composition, adhesive film prepared using the same and optical display apparatus comprising the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR20160117866A true KR20160117866A (en) | 2016-10-11 |
Family
ID=57161760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020150045767A KR20160117866A (en) | 2015-03-31 | 2015-03-31 | Adhesive composition, adhesive film prepared using the same and optical display apparatus comprising the same |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR20160117866A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107880800A (en) * | 2017-11-20 | 2018-04-06 | 上海固柯胶带科技有限公司 | A kind of novel solvent-free adhesive tape and preparation method thereof |
| KR20190083480A (en) | 2018-01-04 | 2019-07-12 | 동우 화인켐 주식회사 | Adhesive sheet, optical member and display device using the same |
| WO2022055148A1 (en) * | 2020-09-11 | 2022-03-17 | 주식회사 엘지화학 | Adhesive composition for foldable display and adhesive film for foldable display comprising cured product thereof |
-
2015
- 2015-03-31 KR KR1020150045767A patent/KR20160117866A/en not_active Application Discontinuation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107880800A (en) * | 2017-11-20 | 2018-04-06 | 上海固柯胶带科技有限公司 | A kind of novel solvent-free adhesive tape and preparation method thereof |
| KR20190083480A (en) | 2018-01-04 | 2019-07-12 | 동우 화인켐 주식회사 | Adhesive sheet, optical member and display device using the same |
| WO2022055148A1 (en) * | 2020-09-11 | 2022-03-17 | 주식회사 엘지화학 | Adhesive composition for foldable display and adhesive film for foldable display comprising cured product thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101566061B1 (en) | Adhesive film, adhesive composition for the same and display member comprising the same | |
| KR101374374B1 (en) | Adhesive Composition, Adhesive Film Comprising the Same, Method for Preparing the Adhesive Film and Display Member Using the Same | |
| KR101385042B1 (en) | Adhesive Composition, Adhesive Film Comprising the Same, Method for Preparing the Adhesive Film and Display Member Using the Same | |
| US20200407606A1 (en) | Optical display comprising an adhesive film | |
| KR101628435B1 (en) | Adhesive film, adhesive composition for the same and display member comprising the same | |
| KR101628437B1 (en) | Adhesive film, adhesive composition for the same and display member comprising the same | |
| KR101566060B1 (en) | Adhesive film, adhesive composition for the same and display member comprising the same | |
| KR101385038B1 (en) | Adhesive Composition, Adhesive Film Comprising the Same, Method for Preparing the Adhesive Film and Display Member Using the Same | |
| KR101758420B1 (en) | Adhesive composition, adhesive film prepared using the same and optical display apparatus comprising the same | |
| KR101780542B1 (en) | Adhesive film and flexibile display apparatus comprising the same | |
| KR101802575B1 (en) | Polarizing plate, method for preparing the same and optical display apparatus comprising the same | |
| JP7429752B2 (en) | Adhesive compositions, adhesive films, optical films with adhesive layers, liquid crystal panels | |
| KR20160117866A (en) | Adhesive composition, adhesive film prepared using the same and optical display apparatus comprising the same | |
| KR101494495B1 (en) | Pressure sensitive adhesive composition for an optical film | |
| KR101906637B1 (en) | Adhesive composition, optically clear adhesive film and touch screen panel | |
| KR20140136265A (en) | Adhesive composition for touch panel, adhesive film and touch panel | |
| KR101385040B1 (en) | Adhesive Composition, Adhesive Film Comprising the Same, Method for Preparing the Adhesive Film and Display Member Using the Same | |
| KR20160032778A (en) | Adhesive composition for touch screen panel, adhesive film and touch screen panel | |
| KR102352953B1 (en) | Adhesive film, optical member comprising the same and optical display apparatus comprising the same | |
| KR101882572B1 (en) | Adhesive composition for polarizing plate, adhesive film for polarizing plate prepared using the same, polarizing plate comprising the same and optical display apparatus comprising the same | |
| KR101693074B1 (en) | Adhesive film, adhesive composition for the same and display comprising the same | |
| KR101469257B1 (en) | Resin composition for optical film, optical film using the same and method for preparing thereof | |
| KR101385039B1 (en) | Adhesive Composition, Adhesive Film Comprising the Same, Method for Preparing the Adhesive Film and Display Member Using the Same | |
| JP2012118433A (en) | Near infrared shielding film and near infrared shielding body using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E902 | Notification of reason for refusal | ||
| E601 | Decision to refuse application |