CN105482744A - Adhesive and adhesive sheet - Google Patents
Adhesive and adhesive sheet Download PDFInfo
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- CN105482744A CN105482744A CN201510640224.3A CN201510640224A CN105482744A CN 105482744 A CN105482744 A CN 105482744A CN 201510640224 A CN201510640224 A CN 201510640224A CN 105482744 A CN105482744 A CN 105482744A
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Abstract
The invention relates to an adhesive and an adhesive sheet. The adhesive contains a (meth)acrylic polymer, the (meth)acrylic polymer contains a constituent unit which is derived from alkyl methacrylate having a branched alkyl group having 5 to 9 carbon atoms and is 35% by mass relative to a total constituent unit, and a constituent unit which is derived from a monomer having a hydroxyl group and is 0.1% to 35% by mass relative to the total constituent unit, and a glass transition temperature is -55 to -10 DEG C.
Description
Technical field
An embodiment of the invention relate to tackiness agent and adhesive sheet.
Background technology
Touch panel is used in the input unit of the electronics such as mobile phone and portable information terminal.Touch panel is generally by glass substrate, transparent and electrically conductive film, and multiple parts such as design film are formed.These parts are stacked via the binder layer formed by tackiness agent.
Along with the thin-walled property of touch panel in recent years, binder layer also requires thin-walled property.But if by binder layer thin-walled property, then the electrostatic capacitance of touch panel inside becomes large, therefore easily causes flase operation.Therefore, in recent years, even if by binder layer thin-walled property, in order to not make electrostatic capacitance increase, the binder layer that relative permittivity is low is sought.
In addition, portable electric appts is subject to dropping etc. impacting and the parts of formation touch panel may be made to peel off.Therefore, being difficult to impact peel off, as the binder layer for touch panel, requiring the binder layer that bounding force is high.
In Japanese Unexamined Patent Publication 2013-129789 publication, Japanese Unexamined Patent Publication 2013-194170 publication and Japanese Unexamined Patent Publication 2013-32500 publication, disclose a kind of tackiness agent containing (methyl) acrylic acid polymer, described (methyl) acrylic acid polymer makes to have branched-chain alkyl (methyl) alkyl acrylate at ester end and have the monomer of ring texture or be polymerized with the ratio specified separately at (methyl) alkyl acrylate that ester end has a straight chained alkyl.Tackiness agent meets bond properties and can realize the low binder layer of relative permittivity.
Summary of the invention
In the manufacture of touch panel, the parts of stacked formation touch panel are (following, also referred to as " touch panel component parts ") time, for the laminating of each parts, most use cutters cut into the adhesive sheet (having the sheet of binder layer) of the size meeting above-mentioned parts.During cutting adhesive sheet, if binder layer is attached to cutters, then binder layer distortion, when this adhesive sheet is used for the laminating of touch panel component parts, binder layer protrudes from touch panel component parts.Therefore, require that binder layer is not attached to cutters when the cutting of adhesive sheet, can easily process (hereinafter also referred to as " processibility ") adhesive sheet.
But, having in the adhesive sheet of the low binder layer of relative permittivity in the past, also processibility is not studied.
An embodiment of the invention complete in view of the foregoing.
That is, the problem of each embodiment of the present invention be to provide a kind of and be formed with that relative permittivity is low, bounding force is high, the tackiness agent of the binder layer of excellent in workability and have that relative permittivity is low, bounding force is high, the adhesive sheet of the binder layer of excellent in workability.
The means solving above-mentioned problem comprise with under type.
< 1 > tackiness agent, containing (methyl) acrylic acid polymer, should (methyl) acrylic acid polymer to contain relative to total Component units be that deriving from of more than 35 quality % has Component units that carbonatoms is the alkyl methacrylate of the branched-chain alkyl of 5 ~ 9 and be the Component units deriving from the monomer with hydroxyl of 0.1 quality % ~ 35 quality % relative to total Component units, and second-order transition temperature is-55 DEG C ~-10 DEG C.
The tackiness agent of < 2 > according to < 1 >, the above-mentioned containing ratio deriving from the Component units of the monomer with hydroxyl in above-mentioned (methyl) acrylic acid polymer is 5 quality % ~ 35 quality % relative to total Component units.
The tackiness agent of < 3 > according to < 1 > or < 2 >, it is that deriving from of more than 5 quality % has the alkyl acrylate that carbonatoms is the branched-chain alkyl of 5 ~ 9 that above-mentioned (methyl) acrylic acid polymer contains further relative to total Component units.
< 4 > is according to the tackiness agent described in < 3 >, the above-mentioned containing ratio deriving from the Component units of the monomer with hydroxyl in above-mentioned (methyl) acrylic acid polymer is 10 quality % ~ 35 quality % relative to total Component units, and the above-mentioned containing ratio deriving from the Component units of alkyl acrylate in above-mentioned (methyl) acrylic acid polymer is more than 10 quality % relative to total Component units.
The tackiness agent of < 5 > according to any one of < 1 > ~ < 4 >, the above-mentioned containing ratio deriving from the Component units of alkyl methacrylate in above-mentioned (methyl) acrylic acid polymer is more than 50 quality % relative to total Component units, and above-mentioned in above-mentioned (methyl) acrylic acid polymer derives from the Component units of the monomer with hydroxyl and the above-mentioned ratio deriving from the Component units of alkyl methacrylate is 1/2.5 ~ 1/7.5 by quality ratio.
The tackiness agent of < 6 > according to any one of < 1 > ~ < 5 >, at least a kind of above-mentioned alkyl methacrylate is 2-Ethylhexyl Methacrylate.
The tackiness agent of < 7 > according to any one of < 1 > ~ < 6 >, the containing ratio deriving from the Component units of the monomer with cyclic group of above-mentioned (methyl) acrylic acid polymer is below 5 quality % relative to total Component units.
The tackiness agent of < 8 > according to any one of < 1 > ~ < 7 >, for touch panel component parts of fitting.
< 9 > adhesive sheet, there is binder layer, the crosslinking structure that described binder layer comprises the tackiness agent generation crosslinking reaction according to any one of < 1 > ~ < 8 > and formed.
According to an embodiment of the invention, there is provided a kind of and can form that relative permittivity is low, bounding force is high, the tackiness agent of the binder layer of excellent in workability, and have that relative permittivity is low, bounding force is high, the adhesive sheet of the binder layer of excellent in workability.
Embodiment
Below, an embodiment of the invention are described.
Should illustrate, use the numerical range that " ~ " represents in this specification sheets, represent the scope contained as minimum value and maximum value by the numerical value that the front and back of " ~ " are recorded.
In addition, in this specification sheets, (methyl) vinylformic acid refers at least one in vinylformic acid and methacrylic acid, and (methyl) acrylate refers at least one in acrylate and methacrylic ester.
< tackiness agent >
Tackiness agent contains (methyl) acrylic acid polymer that second-order transition temperature is-55 DEG C ~-10 DEG C, and it is that deriving from of more than 35 quality % has Component units that carbonatoms is the alkyl methacrylate of the branched-chain alkyl of 5 ~ 9 and be the Component units deriving from the monomer with hydroxyl of 0.1 quality % ~ 35 quality % relative to total Component units that described (methyl) acrylic acid polymer contains relative to total Component units.
In addition, tackiness agent can containing forming the linking agent of crosslinking structure with (methyl) acrylic acid polymer.In addition, when tackiness agent contains linking agent, crosslinking catalyst and sequestrant can be contained further in tackiness agent.
In addition, tackiness agent can as required further containing other compositions other than the above.
By making tackiness agent be above-mentioned formation, thus can form that relative permittivity is low, bounding force is high and the binder layer of excellent in workability.
The reason that can obtain the effect of an embodiment of the invention is presumed as follows.
Because the alkyl methacrylate used when manufacturing (methyl) acrylic acid polymer in an embodiment of the invention is more than carbonatoms greatly to 5 of alkyl and alkyl is the structure of side chain, therefore molecular volume is large, moment of dipole is little.Therefore, it is possible to make containing above-mentioned the molecular volume increase, the moment of dipole reduction that derive from (methyl) acrylic acid polymer of the Component units of alkyl methacrylate.Its result, the tackiness agent containing above-mentioned (methyl) acrylic acid polymer can form the low binder layer of relative permittivity.
In addition, by making the carbonatoms of the alkyl of alkyl methacrylate be less than 9, thus compared with being the alkyl methacrylate of more than 10 with the carbonatoms of alkyl, the binder layer that relative permittivity is low can be formed.This reason is still not clear, but think that its reason is, the carbonatoms of alkyl is compared with the alkyl methacrylate of less than 9 is the alkyl methacrylate of more than 10 with the carbonatoms of alkyl, and volumetric shrinkage when forming polymkeric substance is little and be that the molecular volume of (methyl) acrylic acid polymer of the Component units of the alkyl methacrylate of less than 9 becomes large containing the carbonatoms deriving from alkyl.
As mentioned above, for the tackiness agent of an embodiment of the invention, the molecular volume of the alkyl methacrylate used when manufacturing (methyl) acrylic acid polymer is large and moment of dipole is little.Further, volumetric shrinkage during above-mentioned alkyl methacrylate formation polymkeric substance is little, and therefore, the molecular volume of (methyl) acrylic acid polymer increases.Its result, thinks and can form the low binder layer of relative permittivity.
In addition, the lower limit of the second-order transition temperature of (methyl) acrylic acid polymer of the tackiness agent of an embodiment of the invention is-55 DEG C, therefore high, the excellent in workability of the cohesive force of binder layer.In addition, the upper limit of the second-order transition temperature of (methyl) acrylic acid polymer is-10 DEG C, therefore thinks that the bounding force of binder layer is high.
As the purposes of the tackiness agent of an embodiment of the invention, such as, the purposes of fixing touch panel component parts can be enumerated.Particularly, the tackiness agent of an embodiment of the invention particularly preferably uses when multiple touch panel component parts such as glass adhering substrate, transparent and electrically conductive film and design film manufacture touch panel.In addition, be more suitable for laminating transparent and electrically conductive film and its beyond touch panel component parts to manufacture touch panel.
It is that deriving from of more than 35 quality % has Component units that carbonatoms is the alkyl methacrylate of the branched-chain alkyl of 5 ~ 9 and be the Component units deriving from the monomer with hydroxyl of 0.1 quality % ~ 35 quality % relative to total Component units that (methyl) acrylic acid polymer contained in the tackiness agent of an embodiment of the invention contains relative to total Component units, and second-order transition temperature is-55 DEG C ~-10 DEG C.Be somebody's turn to do (methyl) acrylic acid polymer further containing the Component units deriving from alkyl acrylate, can also further containing the Component units beyond the Component units described.
Manufacture (methyl) if acrylic acid polymer time the alkyl methacrylate that uses there is branched-chain alkyl carbonatoms be less than 5, then the little and moment of dipole of the molecular volume of alkyl methacrylate becomes large, and tackiness agent can not form the low binder layer of relative permittivity.
In addition, if the carbonatoms of above-mentioned branched-chain alkyl is more than 9, then there is the trend that volumetric shrinkage when alkyl methacrylate being formed polymkeric substance is large, the molecular volume of (methyl) acrylic acid polymer diminishes.The carbonatoms of above-mentioned branched-chain alkyl increases more than 9 and along with carbonatoms, and the polymerizability of polymkeric substance is deteriorated, and is therefore difficult to obtain the large polymkeric substance of molecular weight.Its result, the cohesive force step-down of polymkeric substance, poor in processability.Therefore, if the carbonatoms of above-mentioned branched-chain alkyl is more than 9, then tackiness agent can not form the low and binder layer of excellent in workability of relative permittivity.
In addition, from the viewpoint of viewpoint and the processibility of above-mentioned relative permittivity, the carbonatoms of the branched-chain alkyl of preferable methyl alkyl acrylate is 7 ~ 9.
It is the containing ratio of the Component units of the alkyl methacrylate of the branched-chain alkyl of 5 ~ 9 is more than 35 quality % relative to total Component units that deriving from (methyl) acrylic acid polymer has carbonatoms.From the viewpoint of viewpoint and the bounding force of the viewpoint of relative permittivity, processibility, this containing ratio is preferably more than 50 quality % relative to total Component units, more preferably more than 60 quality %, most preferably is more than 70 quality %.
If this containing ratio is less than 35 quality %, then tackiness agent cannot form the low binder layer of relative permittivity.
In addition, even if there is not the character (hereinafter also referred to " wet-heat resisting albefaction ") of albefaction under hot and humid environment from the viewpoint of adjustment yet, derive from that to have carbonatoms be that the containing ratio of the Component units of the alkyl methacrylate of the branched-chain alkyl of 5 ~ 9 is preferably below 90 quality %, be more preferably below 85 quality %, more preferably below 80 quality %.
In addition, preferably (methyl) acrylic acid polymer to derive from that to have carbonatoms be the containing ratio of the Component units of the alkyl methacrylate of the branched-chain alkyl of 5 ~ 9 be more than 50 quality %, further, the Component units and the above-mentioned ratio deriving from the Component units of alkyl methacrylate that derive from the monomer with hydroxyl are 1/2.5 ~ 1/7.5 by quality ratio.Meet above-mentioned scope by the Component units and the above-mentioned ratio deriving from the Component units of alkyl methacrylate that make to derive from the monomer with hydroxyl, thus tackiness agent can form the more excellent binder layer of balance of relative permittivity, processibility, wet-heat resisting albefaction.
(methyl) acrylic acid polymer contained by the tackiness agent of an embodiment of the invention contains the Component units deriving from the monomer with hydroxyl.(methyl) acrylic acid polymer by containing the monomer with hydroxyl, thus can with linking agent generation crosslinking reaction described later.Therefore, by the binder layer formed containing the tackiness agent of (methyl) acrylic acid polymer, the high and excellent in workability of its cohesive force.
The containing ratio deriving from the Component units of the monomer with hydroxyl in (methyl) acrylic acid polymer is 0.1 quality % ~ 35 quality % relative to total Component units.If this containing ratio is less than 0.1 quality %, then fully cannot reacts with linking agent, the cohesive force of the binder layer therefore formed is low, the poor in processability of binder layer.In addition, if this containing ratio is more than 35 quality %, then cannot form the low binder layer of relative permittivity.
The containing ratio deriving from the Component units of the monomer with hydroxyl is preferably more than 5 quality % relative to total Component units.If containing ratio is more than 5 quality %, then the binder layer of the binder layer formed and the intermiscibility of moisture increase, and therefore binder layer is more difficult to albefaction, can improve wet-heat resisting albefaction further.
In addition, from the viewpoint of improving above-mentioned wet-heat resisting albefaction, this containing ratio is more preferably more than 10 quality % relative to total Component units, more preferably more than 20 quality %.
The containing ratio deriving from the Component units of the monomer with hydroxyl is preferably below 30 quality % relative to total Component units.If this containing ratio is below 30 quality %, then tackiness agent can form the low binder layer of relative permittivity.
In addition, from the viewpoint of the above-mentioned relative permittivity of reduction, this containing ratio is more preferably below 25 quality % relative to total Component units, more preferably below 20 quality %.
For (methyl) acrylic acid polymer, except the Component units deriving from alkyl methacrylate except described and the described Component units deriving from the monomer with hydroxyl, can further containing the Component units deriving from alkyl acrylate.
By containing the Component units deriving from alkyl acrylate, thus be easy to the molecular weight increasing (methyl) acrylic acid polymer.If the molecule quantitative change of (methyl) acrylic acid polymer is large, then the cohesive force of binder layer uprises, and can form the binder layer of excellent in workability.
As the Component units deriving from alkyl acrylate, from the viewpoint of wet-heat resisting albefaction, preferably derive from and there is the Component units that carbonatoms is the alkyl acrylate of the alkyl of 5 ~ 9.
In addition, as the Component units deriving from alkyl acrylate, from the viewpoint of relative permittivity, preferably derive from the Component units of the alkyl acrylate with branched-chain alkyl.
In addition, as the Component units deriving from alkyl acrylate, from the viewpoint of viewpoint and the relative permittivity of wet-heat resisting albefaction, more preferably derive from and there is the Component units that carbonatoms is the alkyl acrylate of the branched-chain alkyl of 5 ~ 9.
(methyl) acrylic acid polymer is by having containing deriving from the Component units that carbonatoms is the alkyl acrylate of the branched-chain alkyl of 5 ~ 9, thus the wet-heat resisting albefaction of tackiness agent and the binder layer of relative permittivity excellence can be formed, but its reason is still not clear, but think as follows.
Have carbonatoms be the alkyl of 5 ~ 9 alkyl acrylate with have compared with alkyl methacrylate that carbonatoms is the alkyl of 5 ~ 9, second-order transition temperature when forming homopolymer is low, therefore by a part for the alkyl methacrylate used when manufacturing (methyl) acrylic acid polymer is become alkyl acrylate, thus the second-order transition temperature step-down of (methyl) acrylic acid polymer, the wettability of tackiness agent can be improved.Therefore, think that the adaptation of touch panel component parts and binder layer improves when forming binder layer with tackiness agent, such as being fitted each other by touch panel component parts, moisture can be suppressed to immerse from the interface of above-mentioned parts and binder layer.And then, be more than 5 by making the carbonatoms of the alkyl of alkyl acrylate and hydrophobicity is high, thus think and can suppress moisture from the interface of binder layer and above-mentioned parts to soak in export-oriented binder layer.In conjunction with these, the albefaction because of the binder layer caused by moisture can be suppressed.Thus, think that the wet-heat resisting albefaction of the binder layer formed by the tackiness agent containing above-mentioned (methyl) acrylic acid polymer improves.
In addition, if the alkyl in alkyl acrylate is branched-chain alkyl, then with have same carbonatoms straight chained alkyl alkyl acrylate compared with, molecular volume is large.Therefore, think that the relative permittivity of binder layer reduces.
As mentioned above, the alkyl methacrylate that uses when can replace manufacturing (methyl) acrylic acid polymer and use alkyl acrylate, but because the molecular volume of alkyl acrylate is little compared with the molecular volume of alkyl methacrylate, therefore, when whole alkyl methacrylates is become alkyl acrylate, the binder layer that the relative permittivity of tackiness agent is low cannot be formed.
From the viewpoint of viewpoint and the wet-heat resisting albefaction of relative permittivity, it is that the containing ratio of the Component units of the alkyl acrylate of the branched-chain alkyl of 5 ~ 9 is preferably more than 5 quality % relative to total Component units that deriving from (methyl) acrylic acid polymer has carbonatoms, is more preferably more than 10 quality %.
The above-mentioned containing ratio deriving from the Component units of alkyl acrylate is preferably below 64.9 quality % relative to total Component units.If containing ratio is below 64.9 quality %, then can form the binder layer that the balance of relative permittivity and wet-heat resisting albefaction is good.
In addition, from the viewpoint of the balance of above-mentioned relative permittivity and wet-heat resisting albefaction, this containing ratio is more preferably below 45 quality %, more preferably below 30 quality %.
In addition, preferably (methyl) acrylic acid polymer to derive from that to have carbonatoms be the containing ratio of the Component units of the alkyl acrylate of the branched-chain alkyl of 5 ~ 9 be more than 10 quality % relative to total Component units, further, the containing ratio deriving from the Component units of the monomer with hydroxyl is more than 10 quality % relative to total Component units.
By making the Component units deriving from the monomer with hydroxyl of (methyl) acrylic acid polymer and deriving from that to have carbonatoms be that the Component units of the alkyl acrylate of the branched-chain alkyl of 5 ~ 9 is all containing more than 10 quality %, thus moisture can be suppressed to soak into the binder layer formed by tackiness agent, the intermiscibility of binder layer and moisture increases simultaneously, therefore, it is possible to improve wet-heat resisting albefaction further.
As having the alkyl methacrylate that carbonatoms is the branched-chain alkyl of 5 ~ 9, such as, isopentyl methacrylate, 4-Methylpentyl methacrylate, methacrylic acid isocyanate, 2-Ethylhexyl Methacrylate can be enumerated, Isooctyl methacrylate, methacrylic acid ester in the different ninth of the ten Heavenly Stems.In these, from the viewpoint of relative permittivity, preferable methyl 2-EHA.
Having carbonatoms is that the alkyl methacrylate of the branched-chain alkyl of 5 ~ 9 can be used alone or two or more kinds may be used.
As the monomer with hydroxyl, such as, the monomer with hydroxyl and ethylenic unsaturated link(age) can be enumerated.As the concrete example of monomer with hydroxyl, (methyl) vinylformic acid 2-hydroxy methacrylate can be enumerated, (methyl) vinylformic acid 2-hydroxy propyl ester, (methyl) vinylformic acid 3-hydroxy propyl ester, (methyl) vinylformic acid 4-hydroxybutyl, (methyl) vinylformic acid 3-methyl-3-hydroxybutyl, (methyl) vinylformic acid 1, 3-dimethyl-3-hydroxybutyl, (methyl) vinylformic acid 2, 2, 4-trimethylammonium-3-hydroxyl pentyl ester, the own ester of (methyl) vinylformic acid 2-ethyl-3-hydroxyl, single (methyl) glycerol acrylate, polypropylene glycol list (methyl) acrylate, polyethyleneglycol (methyl) acrylate, (methyl) acrylic compound such as poly-(ethylene glycol and 1,2-propylene glycol) single (methyl) acrylate, N-methylol (methyl) acrylamide, N-hydroxyethyl (methyl) acrylamide etc. have (methyl) acrylamide compound and the unsaturated alcohol such as vinyl carbinol, methallyl alcohol etc. of hydroxyl.
Wherein, from the viewpoint of with there is intermiscibility that carbonatoms is the alkyl methacrylate of the branched-chain alkyl of 5 ~ 9 and the good viewpoint of copolymerizable and good with the crosslinking reaction of linking agent, as the monomer with hydroxyl, preferably there is (methyl) hydroxyalkyl acrylates of the hydroxyalkyl of carbonatoms 1 ~ 5, more preferably there is (methyl) hydroxyalkyl acrylates of the hydroxyalkyl of carbonatoms 2 ~ 4, particularly preferably (methyl) vinylformic acid 2-hydroxy methacrylate or (methyl) vinylformic acid 4-hydroxybutyl.
The monomer with hydroxyl can be used alone or two or more kinds may be used.
As alkyl acrylate, such as, can enumerate methyl acrylate, ethyl propenoate, n-butyl acrylate, isobutyl acrylate, n-octyl, Isooctyl acrylate monomer, 2-EHA, vinylformic acid ester in the positive ninth of the ten Heavenly Stems, vinylformic acid ester in the different ninth of the ten Heavenly Stems, vinylformic acid ester in the positive last of the ten Heavenly stems, dodecylacrylate, octadecyl acrylate.
In these, from the viewpoint of viewpoint and the wet-heat resisting albefaction of relative permittivity, preferred 2-EHA.
Alkyl acrylate can be used alone or two or more kinds may be used.
As the Component units that (methyl) acrylic acid polymer can contain except described Component units, such as, can enumerate and derive from β-dimethyl-aminoethylmethacrylate, methyl methacrylate, n-BMA, Propenoic acid, 2-methyl, isobutyl ester, n octyl methacrylate, methacrylic acid ester in the positive ninth of the ten Heavenly Stems, methacrylic acid ester in the positive last of the ten Heavenly stems, lauryl methacrylate, alkyl methacrylate except the alkyl methacrylate of the branched-chain alkyl except having carbonatoms 5 ~ 9 of octadecyl methacrylate etc., (methyl) cyclohexyl acrylate, (methyl) benzyl acrylate, N-vinyl-Epsilon-caprolactam, NVP, vinylbenzene, alpha-methyl styrene, Vinyl toluenes etc. have the monomer of cyclic group, (methyl) vinylformic acid, methylene-succinic acid, toxilic acid, fumaric acid etc. have the monomer of acidic-group, saturated fatty acid vinyl ester, such as vinyl formate base ester, vinyl-acetic ester, vinyl propionate base ester, the aliphatic ethylene base monomers such as " Versaticacids " (trade(brand)name, neodecanoic acid vinyl ester), and vinyl cyanide, the Component units of the cyano vinyl monomer such as methacrylonitrile etc.
From the viewpoint of wet-heat resisting albefaction and bounding force, the containing ratio deriving from the Component units of the monomer with cyclic group in (methyl) acrylic acid polymer is preferably below 5 quality % relative to total Component units, is more preferably below 3 quality %.
The containing ratio deriving from the Component units of the monomer with acidic-group in (methyl) acrylic acid polymer is preferably below 0.5 quality % relative to total Component units.
If the containing ratio deriving from the Component units of the monomer with acidic-group is in above-mentioned scope, then, when the metallic contact of binder layer such as with the transparency electrode of touch panel etc., corrosion of metal can be suppressed.Therefore, the tackiness agent containing above-mentioned (methyl) acrylic acid polymer can be more applicable for touch panel purposes.
In addition, consider from above-mentioned viewpoint, the containing ratio deriving from the Component units of the monomer with acidic-group is more preferably below 0.2 quality % relative to total Component units, does not preferably contain further.
The second-order transition temperature (Tg) of (methyl) acrylic acid polymer is-55 DEG C ~-10 DEG C.If the Tg of (methyl) acrylic acid polymer is less than-55 DEG C, then the poor in processability of cohesive force low, binder layer when forming binder layer.In addition, (methyl) if the Tg of acrylic acid polymer exceedes-10 DEG C, then formed binder layer time bounding force low.
In addition, consider from above-mentioned viewpoint, the Tg of (methyl) acrylic acid polymer is preferably-40 DEG C ~-15 DEG C, is more preferably-35 DEG C ~-18 DEG C.
In this specification sheets, the second-order transition temperature (Tg) of (methyl) acrylic acid polymer is mole average glass transition temperature obtained by following calculating.
Tg in following formula
1, Tg
2,and Tg
nbe respectively monomer 1, monomer 2 ... with the second-order transition temperature of monomer n homopolymer separately, and be scaled absolute temperature (K) and calculate.M
1, m
2,and m
nfor the mole fraction of respective monomer.
Should illustrate, in the calculating of second-order transition temperature, use absolute temperature (K), but when recording second-order transition temperature in this manual, use degree Celsius (DEG C).
Should illustrate, wherein so-called " second-order transition temperature (Tg) of homopolymer " refers to, to the homopolymer of this monomer, use Differential Scanning Calorimetry metering facility (DSC) (SeikoInstruments Inc., EXSTAR6000), in nitrogen gas stream, measure under the condition measuring sample 10mg, heat-up rate 10 DEG C/minute, using the DSC point of inflexion on a curve that the obtains Tg as homopolymer.
" second-order transition temperature (Tg) of homopolymer " of representational monomer is, 2-Ethylhexyl Methacrylate-10 DEG C, 2-EHA-76 DEG C, Propenoic acid, 2-methyl, isobutyl ester 48 DEG C, n-BMA 21 DEG C, lauryl methacrylate-65 DEG C, vinylformic acid 2-hydroxy methacrylate-15 DEG C, isodecyl methacrylate-41 DEG C, cyclohexyl methacrylate 56 DEG C.
The weight-average molecular weight (Mw) of (methyl) acrylic acid polymer is not particularly limited, from the viewpoint of the processibility of binder layer and to difference of altitude to follow easness (following, also referred to as " difference of altitude tracing ability ") viewpoint consider, be preferably 200,000 ~ 1,000,000, be more preferably 300,000 ~ 800,000, most preferably be 400,000 ~ 600,000.
In addition, from the viewpoint of difference of altitude tracing ability, the weight-average molecular weight (Mw) of (methyl) acrylic acid polymer and the ratio of number-average molecular weight (Mn) and dispersity (Mw/Mn) are preferably less than 20, be more preferably the scope of 3 ~ 15, most preferably be 4.5 ~ 8.
Should illustrate, the weight-average molecular weight (Mw) of (methyl) acrylic acid polymer and number-average molecular weight (Mn) use gel permeation chromatography (GPC) to measure the value obtained according to following (1) ~ (3).
(1) solution coat of (methyl) acrylic acid polymer is in interleaving paper, and 100 DEG C of dryings 2 minutes, obtain film like (methyl) acrylic acid polymer.
(2) with tetrahydrofuran (THF), film like (methyl) acrylic acid polymer obtained in above-mentioned (1) is dissolved to make solids component be 0.2 quality %.
(3) according to following condition, use gel permeation chromatography (GPC), as polystyrene standard scaled value, measure weight-average molecular weight (Mw) and the number-average molecular weight (Mn) of (methyl) acrylic acid polymer.
(condition)
GPC:HLC-8220GPC (TOSOH Co., Ltd. system)
Chromatographic column: use 4 TSK-GELGMHXL (TOSOH Co., Ltd. system)
Mobile phase solvent: tetrahydrofuran (THF)
Flow velocity: 0.6mL/ divides
Column temperature: 40 DEG C
(methyl) acrylic acid polymer manufactures by the polymerize monomer mixtures that can form described Component units.The polymerization process of (methyl) acrylic acid polymer is not particularly limited, and suitably can select from normally used polymerization process.As polymerization process, solution polymerization process, emulsion polymerization, suspension polymerization etc. can be enumerated.In these methods, from the viewpoint of manufacture can be fairly simple carry out, preferred solution polymerization.
Solution polymerization process uses such as the following known method usually: the chain-transfer agent usually adding the organic solvent of regulation, monomer, polymerization starter and use as required in polymerization tank, in nitrogen gas stream, under the reflux temperature of organic solvent, the reacting by heating of carrying out a few hours is while stirring carried out.
Should illustrate, the weight-average molecular weight (Mw) of (methyl) acrylic acid polymer and number-average molecular weight (Mn), dispersity (Mw/Mn) can more easily be regulated by the kind of polymerization temperature, time, quantity of solvent, catalyzer and the kind of amount and polymerization starter and amount.
As long as linking agent can react with (methyl) acrylic acid polymer and form crosslinking structure, just be not particularly limited, such as, can enumerate polyisocyanate compounds, polyepoxides, polyaziridine compound, condensate of melamine and formaldehyde, metal chelate compound.These linking agents can individually use a kind or combine two or more use.
In these linking agents, from the viewpoint of reactive viewpoint of crosslinking reaction and the stability to environmental change after being cross-linked, preferred polyisocyanate compounds.
As polyisocyanate compounds, such as, the aromatic poly-isocyanate compounds such as eylylene diisocyanate, diphenylmethanediisocyanate, triphenylmethane triisocyanate, tolylene diisocyanate can be enumerated; Aliphatics or the alicyclic polymeric isocyanate compounds such as the hydride of hexamethylene diisocyanate, isoflurane chalcone diisocyanate, aromatic poly-isocyanate compound.
In addition, the adducts of polyol compound of 2 aggressiveness of above-mentioned polyisocyanate compounds or 3 aggressiveness, above-mentioned polyisocyanate compounds and TriMethylolPropane(TMP) etc., the biuret of above-mentioned isocyanate compound can be used as polyisocyanate compounds and use.
Wherein, at least a kind in 2 aggressiveness of eylylene diisocyanate, 3 aggressiveness and adducts is preferably selected from, particularly preferably eylylene diisocyanate adducts.These polyisocyanate compounds can be used alone a kind or mix two or more use.
Polyisocyanate compounds such as can use well with " CORONATEHX ", " CORONATEHL-S ", " CORONATE2234 " " AQUANATE200 ", " AQUANATE210 " (more than, polyurethane Co., Ltd. of Japan system), " DESMODURN3300 ", " DESMODURN3400 " (more than, Sumitomo BAYERURETHANE Co., Ltd. system), " DuranateE-405-80T ", " Duranate24A-100 ", " DuranateTSE-100 " (more than, Asahi Chemical Industry Co., Ltd's system), " TakenateD-110N ", " TakenateD-120N ", " TakenateM-631N " " MT-OLESTERNP1200 " (more than, Mitsui Chemicals, Inc's system) etc. trade(brand)name and commercially available product.
From the viewpoint of processibility and the difference of altitude tracing ability of binder layer, the use level of the linking agent in tackiness agent preferably contains 0.05 mass parts ~ 1.0 mass parts relative to (methyl) acrylic acid polymer 100 mass parts, more preferably containing 0.1 mass parts ~ 0.5 mass parts, further preferably containing 0.15 mass parts ~ 0.3 mass parts.
Except linking agent, in order to accelerate initial cure speed, tackiness agent can contain crosslinking catalyst further.As crosslinking catalyst, such as, can enumerate the organic zirconate etc. such as the organo-tin compound such as dibutyl tin laurate, dioctyl tin laurate, two (methyl aceto acetate) zirconiums of dibutoxy.
When tackiness agent contains crosslinking catalyst, tackiness agent is further preferably containing sequestrant.As sequestrant, such as, beta-diketon class, 'beta '-ketoester class can be enumerated.As beta-diketon class and 'beta '-ketoester class, such as, can enumerate methyl ethyl diketone, methyl acetoacetate, methyl aceto acetate, etheric acid n-propyl, ISOPROPYL ACETOACETATE.In these sequestrants, from the working life of binder composition and the balance well of speed of response, preferred methyl ethyl diketone.
From the viewpoint of viewpoint and the difference of altitude tracing ability of the viewpoint of processibility, bounding force, gel fraction when tackiness agent being formed binder layer is preferably 40 quality % ~ 90 quality %, be more preferably 45 quality % ~ 80 quality %, more preferably 50 quality % ~ 65 quality %.
In this specification sheets, the gel fraction of binder layer is the ratio of the insoluble composition of solvent using ethyl acetate to measure as extraction solvent.The detailed content of measuring method is as follows.
-measuring method of gel fraction-
Gel fraction measures according to the method shown in following (1) ~ (4).
(1) attach about 0.25g binder layer at the 250 order wire nettings (100mm × 100mm) correctly being weighed quality by accurate Libra, the mode do not spilt to make gel component is wrapped up.Thereafter, with the correct quality measurement of accurate Libra, make sample.
(2) sample obtained is flooded 3 days in ethyl acetate 80ml.
(3) cleaning of sample a small amount of ethyl acetate is taken out, 120 DEG C of dryings 24 hours.Thereafter, with the correct quality measurement of accurate Libra.
(4) following formula is utilized to obtain gel fraction.
Gel fraction (quality %)=(Z-X)/(Y-X) × 100
Wherein, X is the quality (g) of wire netting, Y is quality (g) before the dipping of the wire netting being pasted with binder layer, Z is after dipping, through the quality (g) being pasted with the wire netting of binder layer of super-dry.
As other compositions that tackiness agent of the present invention can contain, UV light absorber, tackifier, softening agent, tenderizer, stripping auxiliary agent, dyestuff, pigment, inorganic filler, tensio-active agent, antioxidant, preventing metal corrosion agent, silane coupling agent etc. can be enumerated.Other compositions are matched with in tackiness agent with the amount do not damaged in the scope of the effect of an embodiment of the invention.
< adhesive sheet >
The adhesive sheet of an embodiment of the invention have by described the binder layer that formed of the tackiness agent of an embodiment of the invention.This binder layer contains the crosslinking structure formed between acrylic acid polymer and linking agent at (methyl) that describe.The relative permittivity of this binder layer is low, bounding force is high, excellent in workability.
Adhesive sheet can be the type (without base material type) without base material, also can be the type (having base material type) with base material.
As base material, resin molding (such as, the polyester film of polyethylene terephthalate (PET) etc.) can be enumerated.Base material preferably transparent.The thickness of base material is not particularly limited, but from the viewpoint of weather resistance, preferably 5 μm ~ 100 μm.
As adhesive sheet, from the viewpoint of the transparency, preferably without base material type.
The face of exposing of the binder layer of adhesive sheet can be protected by stripping film.
As stripping film, as long as easily can peel off from binder layer, be just not particularly limited, such as, the resin molding (such as, the polyester film of PET etc.) using stripping treatment agent at least to implement easy lift-off processing at one side can be enumerated.As stripping treatment agent, such as, can enumerate fluorine resin, paraffin, silicone, long chain alkyl compound.
Stripping film by adhesive sheet for practicality during, protection binder layer surface, can peel off in use.
The thickness of the binder layer of adhesive sheet is not particularly limited, and according to purposes and can require that performance is suitably selected.As the thickness of binder layer, from the viewpoint of the viewpoint of difference of altitude tracing ability and the productivity of adhesive sheet, such as, can enumerate the scope of 20 μm ~ 300 μm.
From the viewpoint of visuality during formation touch panel, the transparency of preferred adhesive layer is high, specifically, such as, total light transmittance (JISK7361 (1997)) in visible wavelength region is preferably more than 85%, is more preferably more than 90%.
From the viewpoint of visuality when forming touch panel, the mist degree (JISK7136 (2000)) of binder layer is preferably less than 2.0%, is more preferably less than 1.0%, and further preferably less than 0.5%.
For adhesive sheet, such as by the adhesive coated of an embodiment of the invention in stripping film etc., and there is crosslinking reaction after carrying out drying, thus formed and make binder layer.
Such as, for the adhesive sheet without base material type, at the lift-off processing face coating adhesive of stripping film, there is crosslinking reaction and form binder layer, thereafter, to make other stripping film overlapping with the mode that lift-off processing face connects on this binder layer, making thus.
Such as, for the adhesive sheet having base material type, at the two sided coatings tackiness agent of base material, there is crosslinking reaction and form binder layer, thereafter, on the binder layer coating this two sides, make each stripping film with overlapping with the mode that lift-off processing face connects, make thus.In addition, by forming binder layer in the lift-off processing face of stripping film, on the two sides of base material, the overlapping method with the binder layer of this stripping film, also can make.
As the method at stripping film and base material coating adhesive, can enumerate and employ intaglio plate roller coating machine, inverse roll-coater, the known method of engagement roller coating machine, dip coater, bar coater, knife coater, spraying machine etc.
As the purposes of the adhesive sheet of an embodiment of the invention, such as, touch panel purposes can be enumerated.When the adhesive sheet of an embodiment of the invention is specially adapted to multiple parts formation touch panels such as glass adhering substrate, transparent and electrically conductive film and design film.In addition, being more suitable for fits transparent and electrically conductive film and miscellaneous part when forming touch panel.
< touch panel >
Use the tackiness agent of an embodiment of the invention or the touch panel of adhesive sheet, there is the binder layer formed by the tackiness agent of an embodiment of the invention described.Because the relative permittivity of this binder layer is low, even if the very thin thickness of therefore binder layer, also the electrostatic capacitance of touch panel inside can be remained on suitable numerical value when touch panel action, and the flase operation because electrostatic capacitance causes can be suppressed.
In addition, the touch panel of an embodiment of the invention uses the tackiness agent of the one embodiment of the present invention described, excellent in workability when therefore forming adhesive sheet, be difficult to occur that tackiness agent protrudes from touch panel component parts etc. manufacture on unfavorable condition.
Use the touch panel of the tackiness agent of an embodiment of the invention or the electrostatic capacitance mode of adhesive sheet, such as, can form formation design film, binder layer, transparent and electrically conductive film, binder layer, transparent and electrically conductive film are laminated in that order.
[embodiment]
Below, by embodiment, an embodiment of the invention are specifically described, but the present invention is not by the restriction of these embodiment.
(embodiment 1)
[manufacture of (methyl) acrylic acid polymer]
In the reaction unit possessing stirrer, reflux exchanger, successively Dropping feeder and thermometer, add ethyl acetate 147 mass parts and 2, two (2,4-methyl pentane nitrile) 0.05 mass parts of 2 '-azo.Then, monomer mixed solution 600 mass parts be made up of 2-Ethylhexyl Methacrylate (2EHMA) 210 mass parts (be 35 quality % relative to total Component units), 2-EHA (2EHA) 330 mass parts (be 55 quality % relative to total Component units), vinylformic acid 2 hydroxy methacrylate (2HEA) 60 mass parts (be 10 quality % relative to total Component units) is prepared in other container, 150 mass parts are wherein added in reaction unit and heats, carry out backflow in 20 minutes at reflux temperature.Then, under reflux conditions, by residue 450 mass parts, ethyl acetate 33 mass parts and 2 of monomer mixed solution, 2 '-azo two (2,4-methyl pentane nitrile) 0.03 mass parts successively dripped with 90 minutes, drip terminate after so that carry out the polyreaction of 90 minutes.Then, the mixed solution of ethyl acetate 15 mass parts and the peroxidation trimethylacetic acid tert-butyl ester 0.13 mass parts is successively dripped through 30 points, and then carries out 150 minutes polyreactions.
After reaction terminates, be solids component 45 quality % with diluted ethyl acetate, obtain the solution of (methyl) acrylic acid polymer 1.
The weight-average molecular weight (Mw) of (methyl) acrylic acid polymer 1 obtained is 490,000, and dispersity (Mw/Mn) is 6.2, and second-order transition temperature (Tg) is-50 DEG C.Should illustrate, weight-average molecular weight (Mw), number-average molecular weight (Mn) and second-order transition temperature (Tg) are undertaken measuring or calculating by the method described.
[preparation of binder solution]
To solution 222.2 mass parts of (methyl) acrylic acid polymer 1 (be 100 mass parts as solids component), add 0.2 mass parts as the D-110N (Mitsui Chemicals, Inc's system) of linking agent using solids component form to mix, prepare binder solution.
[making of test sample]
Stripping film (the trade(brand)name: FILMBYNA100E of easy lift-off processing is carried out at the binder solution silicone-based stripping treatment agent that will prepare, Tengsen Industrial Co., Ltd's system) lift-off processing face, be coated with in the mode making the thickness of dried binder layer become 50 μm, form coating layer.Thereafter, the stripping film with the coating layer obtained is carried out drying under the drying conditions of 100 DEG C, 2 minutes, stripping film forms binder layer.The face of being exposed by binder layer fits in the stripping film (trade(brand)name: FILMBYNA100E, Tengsen Industrial Co., Ltd's system) prepared in addition, makes the adhesive sheet without base material type.Thereafter, under the environment of temperature 23 DEG C, 50%RH, slaking carries out crosslinking reaction in 4 days, obtains having the test sample of the binder layer comprising crosslinking structure.The gel fraction of the test sample made is 58.0 quality %.Should illustrate, gel fraction utilizes the method described to measure.
[evaluation]
According to following test, the relative permittivity of the binder layer in evaluation test sample, processibility, bounding force and wet-heat resisting albefaction.Show the result in table 1.
(relative permittivity)
A stripping film of the test sample made is peeled off, makes it fit in electrolytic copper foil (The Furakawa Electric Co., Ltd.'s system, 10 μm, NC-WC item for disposal).Thereafter, another stripping film of test sample to be peeled off, and then in the face that binder layer exposes, another face that binder layer of the test sample after having peeled off a stripping film is exposed of fitting.This test sample of fitting is repeated, until binder layer is the thickness of 200 μm with this order.When binder layer reaches the thickness of 200 μm, the stripping film of the test sample of finally fitting is peeled off, at the face laminating electrolytic copper foil that binder layer exposes.The sample being laminated with the binder layer of 200 μm of thickness between 2 electrolytic copper foils obtained thus is cut into the size of 50mm × 50mm, as relative permittivity working sample.
For the mensuration of relative permittivity, the material analyzing instrument 4291B of AgilentTechnologies is used to be undertaken by following condition.Then, by the relative permittivity of following benchmark evaluation binder layer.A and B of following metewand is practical no problem grade, and C is practical problematic grade.
-condition determination-
Measure the DielectricTestFixture16453A of fixture: AgilentTechnologies
Measure frequency: 100kHz
-metewand-
A: relative permittivity is less than 3.5.
B: relative permittivity is more than 3.5 and be less than 4.0.
C: relative permittivity is more than 4.0.
(processibility)
The processibility of binder layer is evaluated according to the confining force of JISZ0237 (2009).That is, evaluate by the test of following record.
A stripping film of the test sample made is peeled off, fits in the face of carrying out easy adhesion process of the PET film (A-4100 (Toyo Boseki K.K's system), thickness 100 μm) through easy adhesion process.Thereafter, cut into the size of 25mm × 50mm, after cutting, another stripping film is peeled off, in the mode that to connect with stainless steel (SUS) plate of the end 10mm apart from test sample, pressing and fit (fitting area 25mm × 10mm), thus formation processibility sample for evaluation are carried out to it.By this processibility sample for evaluation 23 DEG C, under the environment of 50%RH, keep SUS plate to be the normal direction on ground and under the non-fitting part of adhesive sheet is, hang weight in the mode of load adhesive sheet being applied to 1.0kg.After applying load, measure the miles of relative movement of the adhesive sheet after 1 hour, evaluate processibility according to following metewand.Should illustrate, for processibility, miles of relative movement is more short more excellent, A and B of following metewand is practical no problem grade, and C is practical problematic grade.
-metewand-
A: miles of relative movement is less than 0.4mm.
B: miles of relative movement is more than 0.4mm and is less than 0.8mm.
C: miles of relative movement is more than 0.8mm.
(bounding force)
Peel off a stripping film of the test sample made, the face that binder layer is exposed fits in the face of the easy adhesion process of process of the PET film (A-4100 (Toyo Boseki K.K's system), thickness 100 μm) through easy adhesion process.After this test sample is cut into 25mm × 150mm, another stripping film is peeled off, use the rubber rollers of heavy 2kg to be pressed on glass pane surface in the mode making binder layer and connect with sheet glass, thus formation bounding force sample for evaluation.
By this bounding force sample for evaluation 23 DEG C, place 24 hours under the condition of 50%RH after, measure the bounding force (N/25mm) when 180 ゜ peel off with peeling rate 300mm/min, evaluate according to following metewand.A, B and C of following metewand are grades no problem in practical, and D is practical problematic grade.
-metewand-
A: bounding force is more than 20N/25mm.
B: bounding force is more than 15N/25mm and is less than 20N/25mm.
C: bounding force is more than 10N/25mm and is less than 15N/25mm.
D: bounding force is less than 10N/25mm.
(wet-heat resisting albefaction)
The test sample of making is cut the size into width 80mm × length 60mm.Test sample stripping film is peeled off, sheet glass (the Song Langxiaozi Industrial Co., Ltd system of the face that binder layer is exposed and thickness 1.8mm, optics soda-lime glass, width 250mm × length 200mm) overlapping, use the pressing of table surface layer press, as wet-heat resisting albefaction test sample, measure mist degree (dropping into the front mist degree of test).Thereafter, 85 DEG C, place 250 hours under the environment of 90%RH, 23 DEG C, cooling after 10 minutes under the environment of 50%RH, measure mist degree (test drop into after mist degree).Should illustrate, mist degree uses the NDH5000SP of Japanese electricity Se Co., Ltd. to measure.Obtaining from testing the value (Δ H) dropping into and deduct rear mist degree and drop into the front mist degree of test, evaluating wet-heat resisting albefaction according to following metewand.Should illustrate, Δ H is less, and wet-heat resisting albefaction is more excellent.
-metewand-
A: Δ H is less than 1.0.
B: Δ H is more than 1.0 and is less than 1.5.
C: Δ H is more than 1.5 and is less than 2.0.
D: Δ H is more than 2.0 and is less than 4.0.
E: Δ H is more than 4.0.
(embodiment 2 ~ embodiment 9, comparative example 1 ~ comparative example 8)
About embodiment 2 ~ embodiment 9, comparative example 1 ~ comparative example 8, as shown in Table 1 and Table 2, change the composition of (methyl) acrylic acid polymer in tackiness agent, in addition, similarly to Example 1, carry out the making of the manufacture of (methyl) acrylic acid polymer, the preparation of tackiness agent and test sample, and the relative permittivity of binder layer in evaluation test sample, processibility, bounding force and wet-heat resisting albefaction.Result is shown in table 1 or table 2.
[table 1]
[table 2]
Should illustrate, the abbreviation shown in table 1 and table 2 is as follows.
2EHMA: 2-Ethylhexyl Methacrylate (there is the alkyl methacrylate that carbonatoms is the branched-chain alkyl of 8)
2EHA: 2-EHA (there is the alkyl acrylate that carbonatoms is the branched-chain alkyl of 8)
IBMA: Propenoic acid, 2-methyl, isobutyl ester (there is the alkyl methacrylate that carbonatoms is the branched-chain alkyl of 4)
NBMA: n-BMA (there is the alkyl methacrylate that carbonatoms is the straight chained alkyl of 4)
IDMA: isodecyl methacrylate (there is the alkyl methacrylate that carbonatoms is the branched-chain alkyl of 10)
LMA: lauryl methacrylate (there is the alkyl methacrylate that carbonatoms is the straight chained alkyl of 12)
CHMA: cyclohexyl methacrylate (there is the monomer of cyclic group)
2HEA: vinylformic acid 2-hydroxy methacrylate (there is the monomer of hydroxyl)
D-110N: isocyanate-based linking agent (trade(brand)name TakenateD-110N)
As shown in Table 1, for embodiment 1 ~ embodiment 9, relative permittivity, processibility and bounding force are all excellent.
As shown in Table 2, as shown in comparative example 1, if the containing ratio deriving from the Component units of the monomer with hydroxyl is more than 35 quality %, then relative permittivity is high.
From comparative example 2, if derived from, to have carbonatoms be that the containing ratio of the Component units of the alkyl methacrylate of the branched-chain alkyl of 5 ~ 9 is less than 35 quality %, then relative permittivity is high.
From comparative example 3 ~ comparative example 7, have Component units that carbonatoms is the alkyl methacrylate of the branched-chain alkyl of 5 ~ 9 and the Component units containing the Component units or derive from deriving from alkyl acrylate with the methacrylic ester of the branched-chain alkyl of carbonatoms more than 9 or straight chained alkyl if replace deriving from, then cannot get both relative permittivity and processibility.
From comparative example 8, if the Tg of (methyl) acrylic acid polymer exceedes-10 DEG C, then bounding force is low, can not play function as tackiness agent.
Claims (9)
1. a tackiness agent, containing (methyl) acrylic acid polymer, should (methyl) acrylic acid polymer to contain relative to total Component units be that deriving from of more than 35 quality % has Component units that carbonatoms is the alkyl methacrylate of the branched-chain alkyl of 5 ~ 9 and be the Component units deriving from the monomer with hydroxyl of 0.1 quality % ~ 35 quality % relative to total Component units, and second-order transition temperature is-55 DEG C ~-10 DEG C.
2. tackiness agent according to claim 1, wherein, the containing ratio deriving from the Component units of the monomer with hydroxyl described in described (methyl) acrylic acid polymer is 5 quality % ~ 35 quality % relative to total Component units.
3. tackiness agent according to claim 1 and 2, it is that deriving from of more than 5 quality % has the Component units that carbonatoms is the alkyl acrylate of the branched-chain alkyl of 5 ~ 9 that described (methyl) acrylic acid polymer contains further relative to total Component units.
4. tackiness agent according to claim 3, wherein, the containing ratio deriving from the Component units of the monomer with hydroxyl described in described (methyl) acrylic acid polymer is 10 quality % ~ 35 quality % relative to total Component units,
The containing ratio deriving from the Component units of alkyl acrylate described in described (methyl) acrylic acid polymer is more than 10 quality % relative to total Component units.
5. tackiness agent according to claim 1 and 2, wherein, the containing ratio deriving from the Component units of alkyl methacrylate described in described (methyl) acrylic acid polymer is more than 50 quality % relative to total Component units,
The Component units and the described ratio deriving from the Component units of alkyl methacrylate that derive from the monomer with hydroxyl described in described (methyl) acrylic acid polymer are 1/2.5 ~ 1/7.5 by quality ratio.
6. tackiness agent according to claim 1 and 2, wherein, at least a kind of described alkyl methacrylate is 2-Ethylhexyl Methacrylate.
7. tackiness agent according to claim 1 and 2, wherein, the containing ratio deriving from the Component units of the monomer with cyclic group of described (methyl) acrylic acid polymer is below 5 quality % relative to total Component units.
8. tackiness agent according to claim 1 and 2, for touch panel component parts of fitting.
9. an adhesive sheet, has binder layer, the crosslinking structure that described binder layer comprises the tackiness agent generation crosslinking reaction according to any one of claim 1 ~ 8 and formed.
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| JP2014204153A JP6309422B2 (en) | 2014-10-02 | 2014-10-02 | Adhesive and adhesive sheet |
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| JP2018083851A (en) * | 2015-03-17 | 2018-05-31 | 日立化成株式会社 | Adhesive sheet for image display device, adhesive laminate for image display device, and image display device |
| US10800944B2 (en) | 2016-08-10 | 2020-10-13 | Nitto Denko Corporation | Pressure-sensitive adhesive sheet |
| JP6872869B2 (en) | 2016-08-10 | 2021-05-19 | 日東電工株式会社 | Adhesive sheet |
| JP6738759B2 (en) * | 2017-03-31 | 2020-08-12 | 日本カーバイド工業株式会社 | Touch panel adhesive composition and touch panel adhesive sheet |
| JP7460315B2 (en) * | 2017-03-31 | 2024-04-02 | リンテック株式会社 | Adhesive compositions, adhesives and adhesive sheets |
| JP6943081B2 (en) * | 2017-08-25 | 2021-09-29 | 王子ホールディングス株式会社 | Adhesive composition, adhesive sheet and laminate |
| JP6443578B1 (en) * | 2017-09-29 | 2018-12-26 | 王子ホールディングス株式会社 | Adhesive composition, adhesive sheet and laminate |
| JP7031951B2 (en) * | 2018-07-09 | 2022-03-08 | 日本カーバイド工業株式会社 | Adhesive composition for touch panel and adhesive sheet for touch panel |
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| WO2014092186A1 (en) * | 2012-12-13 | 2014-06-19 | 東亞合成株式会社 | Active energy ray-curable adhesive composition |
| JP2014152303A (en) * | 2013-02-13 | 2014-08-25 | Toagosei Co Ltd | Adhesive composition for plastic film or sheet |
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| JP2017094488A (en) * | 2014-03-26 | 2017-06-01 | コニカミノルタ株式会社 | Optical film, and window film using the same |
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| JPH115962A (en) * | 1997-04-16 | 1999-01-12 | Sekisui Chem Co Ltd | Self-adhesive and poultice |
| JP2011052101A (en) * | 2009-09-01 | 2011-03-17 | Toagosei Co Ltd | Active energy ray-curable pressure-sensitive adhesive composition for optical film or sheet and active energy ray-curable pressure-sensitive adhesive film or sheet |
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| TW201619332A (en) | 2016-06-01 |
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| KR20160040106A (en) | 2016-04-12 |
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