WO2016072324A1 - 表面保護フィルム用粘着剤組成物および表面保護フィルム - Google Patents
表面保護フィルム用粘着剤組成物および表面保護フィルム Download PDFInfo
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- WO2016072324A1 WO2016072324A1 PCT/JP2015/080329 JP2015080329W WO2016072324A1 WO 2016072324 A1 WO2016072324 A1 WO 2016072324A1 JP 2015080329 W JP2015080329 W JP 2015080329W WO 2016072324 A1 WO2016072324 A1 WO 2016072324A1
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- sensitive adhesive
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- acrylic resin
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- 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
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- 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
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- 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
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
Definitions
- the present invention relates to a pressure-sensitive adhesive composition for a surface protective film and a surface protective film.
- liquid crystal display devices such as smartphones and tablet PCs
- display devices such as plasma displays
- a display device When such a display device is viewed in cross section, it has a thin multi-layered structure having various functions, and the optical functional film forming these multi-layered structures is becoming more highly functional.
- it In order to stably produce and store such a display device composed of a functional optical film having high functions, it is indispensable to apply a surface protective film for preventing damage to the surface of the display device. Yes.
- the surface protective film usually has a film-like support and an adhesive layer formed on at least one surface thereof, and the surface protective film adheres to the adherend when the adhesive layer portion is in contact with the adherend. is doing.
- the surface protective film is required to exhibit a sufficient adhesive force when attached to an adherend and to have little residue due to the adhesive layer when peeled off.
- an indium tin oxide (ITO) film that is actively developed and produced for a touch panel is often manufactured through a high-temperature manufacturing process.
- the surface protective film and the pressure-sensitive adhesive layer are required not to cause problems such as corrosion of metal oxides and poor peeling due to an increase in adhesive force even after a high temperature process.
- Patent Document 1 discloses a pressure-sensitive adhesive formed from an acrylic resin and a crosslinking agent as a surface protective film pressure-sensitive adhesive.
- the gel fraction of the pressure-sensitive adhesive is as low as 0 to 30% by mass, there is a problem that it is easily contaminated and the adhesive strength after heat resistance is increased.
- Patent Document 2 describes an adhesive in which an acrylic resin obtained by copolymerizing a monomer containing a carboxyl group-containing monomer and a crosslinking agent are blended.
- the acrylic resin disclosed in the Examples of Patent Document 2 has a weight average molecular weight of 600,000, which cannot be said to be sufficiently high, and the stain resistance is not sufficient.
- the amount of the carboxyl group-containing monomer used is relatively large, from 5 to 10% by mass in 100% by mass of the polymerizable monomer that forms the acrylic resin, so that it is affixed to an adherend containing a metal oxide or the like. In this case, the adherend is corroded, and the adhesive strength after heat resistance is increased.
- Patent Document 3 describes a pressure-sensitive adhesive formed from an acrylic resin obtained by copolymerizing a monomer containing a specific (meth) acrylic acid alkyl ester and a carboxyl group-containing monomer and an epoxy crosslinking agent.
- an epoxy crosslinking agent is used in addition to corrosion of adherends containing metal oxides and the like due to the high acid value of acrylic resins of 16 to 120 mgKOH / g, and the increase in adhesive strength after heat resistance. Therefore, there is a problem that the flexibility of the pressure-sensitive adhesive layer is not sufficient and the wettability to the adherend is inferior.
- the object of the present invention is to reduce contamination and metal corrosiveness to adherends including optical functional films such as hard coat films, antireflection films, and ITO films, and to have appropriate adhesive strength. And it is providing the surface protection film which has the adhesive composition for surface protection films which can form the adhesive layer which suppressed the raise of the adhesive force after a high temperature manufacturing process, and the said adhesive layer.
- the pressure-sensitive adhesive composition for a surface protective film of the present invention is a pressure-sensitive adhesive composition for a surface protective film containing a (meth) acrylic resin (A) and a hexamethylene diisocyanate-based crosslinking agent (B),
- the polymerizable (meth) acrylic resin (A) contains a (meth) acrylic acid alkyl ester having an alkyl group having 4 or less carbon atoms in an amount in the range of 30.0 to 99.9% by mass.
- the hexamethylene diisocyanate-based crosslinking agent (B) is contained in such an amount that the gel fraction of the pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition for a surface protective film falls within the range of 90.0 to 99.9% by mass. It is characterized by doing.
- the polystyrene equivalent weight average molecular weight (Mw) measured by gel permeation chromatography method (GPC method) is in the range of 1.2 million to 2 million
- Mw / Mn molecular weight distribution
- A3 The acid value is 2 mgKOH / g or less.
- the pressure-sensitive adhesive composition for a surface protective film of the present invention is an amount in the range of 2 to 15 parts by mass of the hexamethylene diisocyanate crosslinking agent (B) with respect to 100 parts by mass of the (meth) acrylic resin (A). It is preferable to contain.
- the surface protective film of the present invention is a surface protective film having a film-like support and an adhesive layer formed on at least one surface of the film-like support,
- the (meth) acrylic resin (A) contains (meth) acrylic acid alkyl ester having an alkyl group having 4 or less carbon atoms in an amount within the range of 30.0 to 99.9% by mass.
- the hexamethylene diisocyanate-based crosslinking agent (B) is contained in such an amount that the gel fraction of the pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition for a surface protective film falls within the range of 90.0 to 99.9% by mass. It is characterized by comprising a pressure-sensitive adhesive composition for a surface protective film.
- the pressure-sensitive adhesive composition for a surface protective film of the present invention comprises a (meth) acrylic resin obtained by solution polymerization of a polymerizable monomer containing a specific amount of a specific (meth) acrylic ester, and a specific cross-linking agent.
- a pressure-sensitive adhesive layer that does not contaminate the adherend and that does not cause metal corrosion on the adherend.
- the present invention when affixed to an adherend, it exhibits sufficient adhesive strength, reduces contamination and metal corrosiveness to the adherend, and further increases the adhesive strength after a high-temperature manufacturing process. It is possible to provide a pressure-sensitive adhesive composition for a surface protective film capable of forming a pressure-sensitive adhesive layer with little adhesion of residue resulting from the pressure-sensitive adhesive layer, and a surface protective film having the pressure-sensitive adhesive layer.
- the pressure-sensitive adhesive composition for a surface protective film and the surface protective film of the present invention will be described.
- the pressure-sensitive adhesive composition for a surface protective film of the present invention is also simply referred to as “pressure-sensitive adhesive composition”.
- acryl and methacryl are collectively referred to as “(meth) acryl”.
- the pressure-sensitive adhesive composition for a surface protective film of the present invention contains a (meth) acrylic resin (A) and a hexamethylene diisocyanate crosslinking agent (B) (hereinafter also referred to as an HDI crosslinking agent (B)).
- the pressure-sensitive adhesive composition usually contains an organic solvent (C).
- the (meth) acrylic resin (A) is a polymer of a polymerizable monomer containing a (meth) acrylic acid alkyl ester (i) having an alkyl group having 4 or less carbon atoms. Obtained by solution polymerization in an organic solvent. Thus, the (meth) acrylic resin (A) has a structural unit derived from (i).
- polymerizable monomer examples include (meth) acrylic acid ester (ii), acid group-containing monomer (iii), in addition to (meth) acrylic acid alkyl ester (i) having 4 or less carbon atoms in the alkyl group.
- Another polar group-containing monomer (iv), and at least one selected from other monomers (v) may be included.
- a polymerizable monomer containing (ii), (iii) or (v) as mentioned above may be mentioned, including (i) and (iv).
- the (meth) acrylic acid alkyl ester (i) is referred to as “monomer (i)”, the (meth) acrylic acid ester (ii) as “monomer (ii)”, and the acid group-containing monomer (iii).
- monomer (i)i As “monomer (iii)”, other polar group-containing monomer (iv) as “monomer (iv)”, and other monomer (v) as “monomer (v)”
- R 1 is a hydrogen atom or a methyl group
- R 2 is an alkyl group having 4 or less carbon atoms.
- the alkyl group in R 2 is any one of a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a tert-butyl group, and a sec-butyl group.
- Examples of the monomer (i) include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, and isobutyl (meth) acrylate. , Tert-butyl (meth) acrylate and sec-butyl (meth) acrylate.
- Monomer (i) may be used alone or in combination of two or more.
- the amount of the monomer (i) used is 30.0 to 99.9% by mass, preferably 33.0%. To 99.9% by mass, more preferably 50.0 to 99.5% by mass, still more preferably 50.0 to 99.0% by mass, and particularly preferably 50.0 to 98.0% by mass.
- the adhesive layer formed from the adhesive composition containing (meth) acrylic-type resin (A) will adhere to functional films for optics, etc. Sufficient adhesion to the body can be obtained, and peeling or lifting during transportation can be suppressed.
- R 3 is a hydrogen atom or a methyl group.
- R 4 is an organic group other than an alkyl group having 4 or less carbon atoms and having no polar group such as a hydroxyl group, an amino group, an amide group, a cyano group, or a carboxyl group.
- R 4 examples include an alicyclic group such as an alkyl group having 5 or more carbon atoms and a cycloalkyl group, an aryl group, an aralkyl group, and an organic group having an ether bond.
- the alkyl group usually has 5 to 24 carbon atoms.
- the cycloalkyl group usually has 5 to 15 carbon atoms.
- the aryl group usually has 6 to 10 carbon atoms.
- the aralkyl group is usually composed of an alkylene group having 1 to 6 carbon atoms and an aryl group having 6 to 10 carbon atoms.
- Examples of the organic group having an ether bond include a group represented by the following formula (g-1).
- R 5 is an alkylene group
- R 6 is an alkyl group or an aryl group
- n is an integer of 1 or more.
- the carbon number of the alkylene group is usually 1 to 10, preferably 1 to 5.
- the alkyl group usually has 1 to 10 carbon atoms, preferably 1 to 4 carbon atoms
- the aryl group usually has 6 to 10 carbon atoms, preferably 6 carbon atoms.
- n is preferably 1 to 20, more preferably 1 to 4, and still more preferably 1 to 2.
- an (meth) acrylic acid alkyl ester having an alkyl group having 5 or more carbon atoms an alicyclic group-containing (meth) acrylic acid ester such as a (meth) acrylic acid cycloalkyl ester, (Meth) acrylic acid aryl ester, (meth) acrylic acid aralkyl ester, alkoxyalkyl (meth) acrylate, alkoxy polyalkylene glycol mono (meth) acrylate and (meth) acrylic acid aryloxyalkyl ester are mentioned.
- Examples of the (meth) acrylic acid alkyl ester having an alkyl group having 5 or more carbon atoms that can be used in the present invention include n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, n-heptyl (meth) ) Acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, n-nonyl (meth) acrylate, isononyl (meth) acrylate, n-decyl (meth) acrylate, isodecyl (meth) ) Acrylate, undecyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate and isostearyl (meth) acrylate.
- Examples of (meth) acrylic acid ester such as (meth) acrylic acid cycloalkyl ester, (meth) acrylic acid aryl ester and (meth) acrylic acid aralkyl ester include cyclohexyl (meth) acrylate, Examples include isobornyl (meth) acrylate, phenyl (meth) acrylate and benzyl (meth) acrylate.
- alkoxyalkyl (meth) acrylate examples include methoxymethyl (meth) acrylate, 2-methoxyethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, 3-methoxypropyl (meth) acrylate, and 3-ethoxy.
- examples include propyl (meth) acrylate, 4-methoxybutyl (meth) acrylate and 4-ethoxybutyl (meth) acrylate.
- alkoxypolyalkylene glycol mono (meth) acrylate examples include methoxydiethylene glycol mono (meth) acrylate, methoxydipropylene glycol mono (meth) acrylate, ethoxytriethylene glycol mono (meth) acrylate, ethoxydiethylene glycol mono (meth) acrylate and And methoxytriethylene glycol mono (meth) acrylate.
- aryloxyalkyl (meth) acrylates examples include phenoxymethyl (meth) acrylate, 2-phenoxyethyl (meth) acrylate, 2-tolyloxyethyl (meth) acrylate, xylyloxymethyl (meth) acrylate, and naphthyloxymethyl. (Meth) acrylate is mentioned.
- Monomer (ii) may be used alone or in combination of two or more.
- the amount of the monomer (ii) used is preferably 0 to 69.9% by mass, more preferably 0 to The amount is 66.9% by mass, more preferably 0 to 49.5% by mass.
- Acid group-containing monomer (iii) Examples of the acid group contained in the monomer (iii) include a carboxyl group, an acid anhydride group, a phosphoric acid group, and a sulfuric acid group.
- carboxyl group-containing monomer examples include ⁇ -carboxyethyl (meth) acrylate, 5-carboxypentyl (meth) acrylate, mono (meth) acryloyloxyethyl ester succinate and Carboxy group-containing (meth) acrylates such as ⁇ -carboxypolycaprolactone mono (meth) acrylate; (meth) acrylic acid; crotonic acid; maleic acid; fumaric acid; itaconic acid; citraconic acid.
- Examples of the acid anhydride group-containing monomer include maleic anhydride and itaconic anhydride.
- Examples of the phosphate group-containing monomer include (meth) acrylic acid esters having a phosphate group in the side chain, and examples of the sulfate group-containing monomer include (meth) acrylic acid esters having a sulfate group in the side chain. Is mentioned.
- Monomers (iii) may be used alone or in combination of two or more.
- the amount of the monomer (iii) used is preferably 0 to 0.3% by mass, more preferably 0 to 0. 2% by mass, particularly preferably 0% by mass.
- the acid value of the (meth) acrylic resin (A) can be controlled by adjusting the amount of the acid group-containing monomer (iii) used. That is, if the usage-amount of monomer (iii) is in the said range, the acid value of (meth) acrylic-type resin (A) can be made low.
- the acid value is low, for example, when a metal oxide such as an ITO film is used for the adherend, corrosion can be reduced, and performance degradation of a hard coat layer or an antireflection layer containing the ITO film is suppressed. I can do things. Moreover, the adhesive force raise after heat processing can be suppressed.
- the hexamethylene diisocyanate-based crosslinking is introduced to introduce a crosslinking point with the hexamethylene diisocyanate-based crosslinking agent (B) into the (meth) acrylic resin (A). It is desirable to use the following monomer (iv) in which a group having reactivity with the isocyanate group of the agent (B) is introduced.
- the pressure-sensitive adhesive composition for a surface protective film of the present invention depends on the crosslinking point supplied by the monomer (iii) and the crosslinking point supplied by the monomer (iv). Needless to say, these amounts are adjusted so that the properties of the product are not impaired.
- polar group-containing monomer (iv) examples include a hydroxyl group-containing monomer, an amino group-containing monomer, an amide group-containing monomer, a nitrogen-based heterocyclic ring-containing monomer, and a cyano group-containing monomer. However, acid group-containing monomers are excluded.
- hydroxyl group-containing monomer examples include a hydroxyl group-containing (meth) acrylate. Specifically, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meta) And hydroxyalkyl (meth) acrylates such as 6-hydroxyhexyl (meth) acrylate and 8-hydroxyoctyl (meth) acrylate.
- the number of carbon atoms of the hydroxyalkyl group in the hydroxyalkyl (meth) acrylate is usually 1 to 12, preferably 1 to 8.
- amino group-containing monomer examples include amino group-containing (meth) acrylates such as dimethylaminoethyl (meth) acrylate and diethylaminoethyl (meth) acrylate.
- amide group-containing monomers examples include (meth) acrylamide, N-methyl (meth) acrylamide, N-ethyl (meth) acrylamide, N-propyl (meth) acrylamide, N-hexyl (meth) acrylamide and N, N-dimethyl (meth) acrylamide is mentioned.
- nitrogen-based heterocyclic ring-containing monomer examples include vinyl pyrrolidone, acryloyl morpholine, and vinyl caprolactam.
- cyano group-containing monomer examples include cyano (meth) acrylate and (meth) acrylonitrile.
- Monomer (iv) is preferably a hydroxyl group-containing monomer because it can be a cross-linking point between the (meth) acrylic resin (A) and the HDI cross-linking agent (B).
- a hydroxyl group-containing monomer as the monomer (iv), even if the acid value of the (meth) acrylic resin (A) is 0 mgKOH / g, the hydroxyl group resulting from the hydroxyl group-containing monomer is reduced. Since it becomes a cross-linking point of the hexamethylene diisocyanate-based cross-linking agent (B), the contamination property and metal corrosiveness to the optical functional film as the adherend are reduced, and appropriate adhesive strength can be expressed.
- the amount of the monomer (iv) used is preferably 0.1 to 10% by mass, more preferably 1 to 8% by mass. %, More preferably 2 to 8% by mass. If the usage-amount of monomer (iv) is more than the said lower limit, a crosslinking point with a hexamethylene diisocyanate type crosslinking agent (B) can be ensured, and the usage-amount of monomer (iv) is the said upper limit. If it is below a value, it can suppress that the viscosity of (meth) acrylic-type resin (A) becomes high too much, and favorable coating property is obtained.
- the amount of the hydroxyl group-containing monomer is not less than the lower limit, even when the amount of the monomer (iii) used is 0 to 0.3% by mass, 0 to 0.2% by mass or 0% by mass.
- a pressure-sensitive adhesive layer having an appropriate cohesive force can be obtained in which a crosslinked structure is effectively formed.
- Monomer (iv) may be used alone or in combination of two or more.
- Examples of other monomers (v) include vinyl esters such as vinyl acetate and vinyl propionate; halogenated olefins such as vinyl chloride and vinylidene chloride; styrene monomers such as styrene and ⁇ -methylstyrene; butadiene , Diene monomers such as isoprene and chloroprene.
- the (meth) acrylic resin (A) using the monomer as described above is produced by a solution polymerization method. Since the solution polymerization method is less contaminated with impurities, the pressure-sensitive adhesive composition containing the (meth) acrylic resin (A) produced by this method is suitable for use in an optical member such as a display device.
- a polymerization solvent and a polymerizable monomer are charged in a reaction vessel, a polymerization initiator is added in an inert gas atmosphere such as nitrogen gas, and the reaction start temperature is usually 40 to 100 ° C., preferably Is set to 50 to 80 ° C., and the reaction system is maintained at a temperature of usually 50 to 90 ° C., preferably 60 to 90 ° C., and allowed to react for 4 to 24 hours.
- the weight average molecular weight (Mw) of the (meth) acrylic resin (A) used in the present invention can be within the range of (a1), and the molecular weight distribution. Can be within the range defined by (a2).
- the polymerization initiator used here is preferably a compound that can be dissolved or dispersed in a polymerization solvent.
- the polymerization initiator include azo initiators and peroxide polymerization initiators.
- azo initiator examples include 2,2′-azobisisobutyronitrile, 2,2′-azobis (4-methoxy-2,4-dimethylvaleronitrile), 2,2′-azobis (2- Cyclopropylpropionitrile), 2,2′-azobis (2,4-dimethylvaleronitrile), 2,2′-azobis (2-methylbutyronitrile), 1,1′-azobis (cyclohexane-1-carbohydrate) Nitrile), 2- (carbamoylazo) isobutyronitrile, 2-phenylazo-4-methoxy-2,4-dimethylvaleronitrile, 2,2′-azobis (2-amidinopropane) dihydrochloride, 2,2′- Azobis (N, N'-dimethyleneisobutylamidine), 2,2'-azobis [2-methyl-N- (2-hydroxyethyl) -propionamide], 2,2'-a Bis (isobutyramide) dihydrate, 4,4′-
- peroxide polymerization initiators examples include t-butyl hydroperoxide, cumene hydroxide, dicumyl peroxide, benzoyl peroxide, lauroyl peroxide, caproyl peroxide, and di-i-propyl peroxide.
- the polymerization initiator may be used alone or in combination of two or more.
- the polymerization initiator as described above may be used in its entirety at the start of polymerization, or may be added in several portions during the polymerization, and the addition method is not particularly limited.
- the polymerization initiator is usually in the range of 0.001 to 5 parts by mass, preferably 0.001 to 3 parts by mass with respect to 100 parts by mass of the polymerizable monomer forming the (meth) acrylic resin (A). Used in quantity. By using the polymerization initiator in such an amount, the weight average molecular weight (Mw) of the (meth) acrylic resin (A) used in the present invention can be adjusted to the range specified by (a1).
- a polymerization initiator, a chain transfer agent, a polymerizable monomer, and a polymerization solvent may be appropriately added during the polymerization reaction.
- the (meth) acrylic resin used in the present invention is produced by a solution polymerization method, and examples of the polymerization solvent used in the solution polymerization method include aromatics such as benzene, toluene and xylene. Hydrocarbons; aliphatic hydrocarbons such as n-pentane, n-hexane, n-heptane and n-octane; alicyclic hydrocarbons such as cyclopentane, cyclohexane, cycloheptane and cyclooctane; diethyl ether, diisopropyl Ethers, ethers such as 1,2-dimethoxyethane, dibutyl ether, tetrahydrofuran, dioxane, anisole, phenylethyl ether and diphenyl ether; halogenated hydrocarbons such as chloroform, carbon tetrachloride, 1,2-dichloroethane and chlor
- the polymerization solvent may be used alone or in combination of two or more.
- the (meth) acrylic resin (A) has a weight average molecular weight (Mw) measured by gel permeation chromatography (GPC method) of 1.2 million to 2 million in terms of polystyrene, preferably 1.3 million. It is in the range of ⁇ 1.8 million.
- Mw weight average molecular weight measured by gel permeation chromatography
- the cohesive force of the (meth) acrylic resin (A) is improved, and the migration component derived from the (meth) acrylic resin (A) in the pressure-sensitive adhesive layer is significantly suppressed. This is preferable in that contamination is reduced. Further, the durability of the pressure-sensitive adhesive layer is also improved. It is preferable at the point of the applicability
- the molecular weight distribution (Mw / Mn) of the (meth) acrylic resin (A) is in the range of 4-9.
- Mw / Mn is within the above range, the content of the low molecular weight substance is reduced, so that the cohesive force of the (meth) acrylic resin (A) is improved, and the (meth) acrylic resin in the pressure-sensitive adhesive layer is improved. It is preferable in that the migration component derived from the resin (A) is greatly suppressed and contamination is reduced.
- the glass transition temperature (Tg) of the (meth) acrylic resin (A) can be measured by, for example, a differential scanning calorimeter, and the type of monomer units constituting the (meth) acrylic resin (A). From the content ratio, it can be calculated by the Fox formula.
- the (meth) acrylic resin is such that the glass transition temperature (Tg) of the (meth) acrylic resin (A) determined by the Fox formula is usually ⁇ 70 to 10 ° C., preferably ⁇ 60 to 0 ° C. (A) can be synthesized.
- As the glass transition temperature of a homopolymer composed of each monomer in the Fox formula for example, a value described in PolymerPoHandbook Fourth edition (Wiley-Interscience 2003) can be used.
- the acid value of the acrylic resin (A) obtained as described above needs to be 2 mgKOH / g or less, preferably 0 to 1 mgKOH / g, more preferably 0 mgKOH / g. preferable.
- the acid value refers to the number of mg of potassium hydroxide necessary to neutralize 1 g of the (meth) acrylic resin (A).
- the amount of the monomer (iii) used is ⁇ an acid group-containing monomer (iii) ) >> is included in an amount within the range described in.
- the (meth) acrylic resin (A) obtained as described above is usually obtained in a state dissolved in the polymerization solvent, and the concentration of the (meth) acrylic resin (A) in the polymerization solvent at this time Is usually 10 to 80% by mass, more preferably 15 to 70% by mass, and particularly preferably 15 to 50% by mass.
- the (meth) acrylic resin (A) dissolved in the polymerization solvent as described above can be separated from the polymerization solvent by adding a poor solvent and used separately. It can also be used in the process.
- the pressure-sensitive adhesive composition of the present invention contains an HDI-based crosslinking agent (B).
- an HDI-based crosslinking agent (B) By crosslinking the (meth) acrylic resin (A) with the HDI crosslinking agent (B), a crosslinked body (network polymer) can be formed, and an adhesive layer having excellent heat resistance can be obtained. .
- the HDI-based cross-linking agent (B) it is possible to suppress an increase in the adhesive strength after heat resistance, and the adhesive layer becomes soft so that the wettability is improved, so that it can be applied to an adherend such as an optical functional film. Problems are less likely to occur in the pasting process.
- Examples of the HDI crosslinking agent include hexamethylene diisocyanate and 2,2,4-trimethyl-1,6-hexamethylene diisocyanate as HDI crosslinking agents having two isocyanate groups in one molecule.
- TPA-100 manufactured by Asahi Kasei Chemicals Corporation (compound name: isocyanurate form of hexamethylene diisocyanate), Coronate HX manufactured by Nippon Polyurethane Co., Ltd.
- the HDI crosslinking agent (B) may be used alone or in combination of two or more.
- the content of the HDI crosslinking agent (B) is appropriately selected according to the (meth) acrylic resin (A), and is 100 parts by mass of the (meth) acrylic resin (A). On the other hand, it is preferably 2 to 15 parts by mass, more preferably 2 to 10 parts by mass.
- the crosslinking agent (B) so that the gel fraction of the pressure-sensitive adhesive composition is 90.0 to 99.9% by mass within the above range, the pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition is The migration component derived from the (meth) acrylic resin (A) is greatly suppressed, and contamination is reduced.
- the pressure-sensitive adhesive layer can obtain sufficient heat resistance due to the cohesive force of the pressure-sensitive adhesive layer, and is excellent in flexibility and adhesiveness.
- the HDI-based crosslinking agent (B) has a structure in which an isocyanate group is bonded to the end of the alkylene group, and since the alkylene group has high mobility, the other end portion is bonded to the end of the isocyanate group. Since the isocyanate group in can move around relatively freely, the reactivity becomes high.
- the (meth) acrylic resin (A) in which the cross-linked structure is formed by the reaction of the isocyanate groups at both ends does not take a rigid structure, so that the pressure-sensitive adhesive layer has flexibility.
- the pressure-sensitive adhesive composition of the present invention preferably contains an organic solvent (C) in order to adjust its coatability.
- an organic solvent it is preferable to use the polymerization solvent described in the column of ⁇ Production conditions of (meth) acrylic resin (A) >> as an organic solvent.
- a pressure-sensitive adhesive composition can be prepared by mixing a monomer solution containing a (meth) acrylic resin (A) and a polymerization solvent and an HDI crosslinking agent (B).
- the content of the organic solvent is usually 20 to 90% by mass, preferably 30 to 80% by mass.
- solid content means all components excluding the organic solvent (C) among the components contained in the pressure-sensitive adhesive composition
- solid content concentration means 100 mass of the pressure-sensitive adhesive composition. The ratio of the solid content to%.
- the pressure-sensitive adhesive composition of the present invention is an antistatic agent, an antioxidant, a light stabilizer, a metal corrosion inhibitor, a tackifier, a plasticizer, and a crosslinking accelerator as long as the effects of the present invention are not impaired.
- Other components such as an agent, a surfactant, a (meth) acrylic resin other than the above (A), and a reworking agent may be contained.
- the pressure-sensitive adhesive composition for a surface protective film of the present invention is prepared by mixing a (meth) acrylic resin (A), an HDI-based crosslinking agent (B), and other components as required by a conventionally known method.
- a (meth) acrylic resin (A) obtained when the (meth) acrylic resin (A) is synthesized by the solution polymerization method is added to the HDI crosslinking agent (B).
- the monomer solution containing the (meth) acrylic resin (A) obtained when the (meth) acrylic resin (A) is synthesized by the solution polymerization method is added to the HDI crosslinking agent (B).
- blending with other components may be mentioned.
- the pressure-sensitive adhesive composition for a surface protective film of the present invention includes, for example, a polymerization containing (meth) acrylic acid alkyl ester having an alkyl group having 4 or less carbon atoms in an amount in the range of 30.0 to 99.9% by mass.
- the pressure-sensitive adhesive layer is formed from the above-mentioned pressure-sensitive adhesive composition.
- the pressure-sensitive adhesive layer can be obtained by proceeding with the crosslinking reaction in the above-mentioned pressure-sensitive adhesive composition, specifically, by crosslinking the (meth) acrylic resin (A) with the HDI-based crosslinking agent (B). It is done.
- the conditions for forming the pressure-sensitive adhesive layer are, for example, as follows.
- the pressure-sensitive adhesive composition of the present invention is applied onto a film-like support and varies depending on the type of solvent, but is usually 50 to 150 ° C., preferably 60 to 100 ° C., usually 1 to 10 minutes, preferably 2 to 7 Dry for minutes to remove the solvent and form a coating.
- the average film thickness of the dried coating film is usually 5 to 75 ⁇ m, preferably 10 to 50 ⁇ m.
- the pressure-sensitive adhesive layer is preferably formed under the following conditions. After applying the pressure-sensitive adhesive composition of the present invention on a film-like support and applying a release film on the coating film formed under the above conditions, usually 3 days or more, preferably 7 to 10 days, usually 5 to 60. C., preferably 15 to 40.degree. C., usually 30 to 70% RH, preferably 40 to 70% RH. When crosslinking is performed under the aging conditions as described above, a crosslinked body (network polymer) can be efficiently formed.
- the pressure-sensitive adhesive composition As a method for applying the pressure-sensitive adhesive composition, known methods such as spin coating, knife coating, roll coating, bar coating, blade coating, die coating, and gravure coating can be employed. By applying the pressure-sensitive adhesive composition to have a predetermined thickness by such a method and removing the solvent, the pressure-sensitive adhesive layer is formed by aging the coating layer.
- the pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition of the present invention has a gel fraction of 90.0 to 99.9% by mass, more preferably 95.0 to 99.9% by mass. If the gel fraction of an adhesive layer is in the said range, the transition component derived from (meth) acrylic-type resin (A) contained in an adhesive layer is suppressed significantly, and it is preferable at the point by which contamination is reduced. In addition, the gel fraction of an adhesive layer can be adjusted to a preferable range with the compounding quantity and reaction conditions of a HDI type crosslinking agent (B).
- the low-speed peel force of the pressure-sensitive adhesive layer of the present invention is usually 0.05 N / 25 mm or more, preferably 0.05 to 0.5 N / 25 mm.
- the high-speed peeling force in the initial state is usually 1.5 N / 25 mm or less, preferably 0.5 to 1.5 N / 25 mm.
- the high-speed peeling force after the high-temperature process is usually 2.5 N / 25 mm or less, and preferably 0.5 to 2.5 N / 25 mm.
- the low speed peel force and the high speed peel force are measured according to the methods described in the examples.
- the surface protective film of this invention has the adhesive layer formed from the above-mentioned adhesive composition for surface protective films.
- the surface protective film may further include a release film, for example, the pressure-sensitive adhesive layer is formed on one surface of the film-like support, and the other surface of the pressure-sensitive adhesive layer that does not have the film-like support. And a surface protective film having a release film attached thereto.
- the film-like support examples include a film-like support such as a polyester film such as polyethylene terephthalate (PET); a polyolefin film such as polyethylene, polypropylene, and an ethylene-vinyl acetate copolymer.
- PET polyethylene terephthalate
- a PET film is preferable in terms of transparency and thermal dimensional stability.
- polyester films such as PET
- plastic films such as polyolefin films such as polyethylene, polypropylene, and ethylene-vinyl acetate copolymers.
- the formation conditions and gel fraction of the pressure-sensitive adhesive layer are the same as the conditions described in the [Pressure-sensitive adhesive layer] column.
- the thickness of the pressure-sensitive adhesive layer is usually 5 to 75 ⁇ m, preferably 10 to 50 ⁇ m, from the viewpoint of maintaining the adhesive performance.
- the film thicknesses of the film-like support and the release film are not particularly limited, but are usually 10 to 100 ⁇ m, preferably 25 to 100 ⁇ m.
- the surface protective film of the present invention is mainly applied to the surface of an optical display device such as a liquid crystal display, a plasma display, a surface conduction electron-emitting device display (SED), etc. Can be protected.
- these optical components are bonded to the surface of components constituting display devices such as polarizing plates, retardation plates, liquid crystal cells, and transparent electrode plates constituting such display devices. The surface can be protected.
- the surface protective film of the present invention is particularly suitable for sticking the surface of an ITO film that requires a high-temperature manufacturing process because it can suppress corrosion of metal oxides and suppress an increase in adhesive strength after heat treatment.
- Example 1 (1) Preparation of pressure-sensitive adhesive composition
- the product “TPA-100” was mixed to obtain an adhesive composition.
- the ratio of each component is an amount which becomes 5 parts of (B1) with respect to 100 parts of resin A1 contained in the (meth) acrylic polymer solution obtained in Synthesis Example A1 (both solid content values) ).
- the pressure-sensitive adhesive composition obtained in (1) above was applied onto a polyethylene terephthalate film (PET film) subjected to a release treatment at a liquid temperature of 25 ° C. using a doctor blade. And it dried at 90 degreeC for 3 minute (s), and formed the coating film with a dry film thickness of 20 micrometers.
- PET film polyethylene terephthalate film
- Two PET films were obtained by further laminating the peeled PET film on the surface of the coating film opposite to the surface on which the PET film was applied, and leaving it to stand for aging in a 23 ° C./50% RH environment for 7 days.
- a surface protective film having a pressure-sensitive adhesive layer having a thickness of 20 ⁇ m sandwiched between the layers was obtained.
- Examples 2 to 10 Comparative Examples 1 to 11
- a pressure-sensitive adhesive composition and a surface protective film were obtained in the same manner as in Example 1, except that the formulation was changed as described in Tables 2-1 and 2-2.
- HDI crosslinking agent (B) and other crosslinking agent B1 Isocyanurate of hexamethylene diisocyanate (manufactured by Asahi Kasei Chemicals Corp., TPA-100)
- B2 Trimolecular adduct of hexamethylene diisocyanate (manufactured by Nippon Polyurethane Industry Co., Ltd., Coronate HX)
- B3 Trimethylolpropane adduct of tolylene diisocyanate (manufactured by Nippon Polyurethane Industry Co., Ltd., Coronate L, solid concentration 75% by mass)
- B4 Meta-xylene diisocyanate adduct type (Mitsui Chemicals, D-120N)
- B5 Epoxy curing agent (Mitsubishi Gas Chemical Co., Ltd., Tetrad C) [Evaluation] [Gel fraction] About 0.1 g of the pressure-sensitive adhesive layer was collected in a sampling bottle
- Gel fraction (%) (Dry weight / Adhesive layer sampling weight) ⁇ 100 (%) [ITO corrosive] Cut the surface protection film obtained in Examples / Comparative Example to 10mm ⁇ 60mm, peel off the one side peeled film and paste it on the ITO vapor-deposited PET film cut to 10mm ⁇ 100mm. Processed. Next, after standing at room temperature for 1 hour, placing it in an environment of 60 ° C. and 90% RH for 500 hours, standing at 23 ° C.
- the change rate of the resistance value with respect to the resistance value of the surface protective film not subjected to the above treatment was determined and evaluated according to the following criteria. Note that a tester (manufactured by Sanwa Denki Keiki Co., Ltd., Digital Multimeter PC510) was used for measuring the resistance value. (Standard) AA: The change rate of the resistance value was less than 10%. -CC: Change rate of resistance value was 10% or more.
- the surface protective films obtained in Examples and Comparative Examples were cut into 25 mm ⁇ 150 mm, and the PET films that had been peeled off were peeled off and attached to stainless steel plates. It was left for 24 hours in an environment of 25 ° C. and 50% humidity. Thereafter, one end was pulled in a 180 ° direction at a peeling speed of 300 mm / min, and the force for starting peeling was defined as a low-speed peeling force.
- the surface protective films obtained in the examples and comparative examples were cut into 25 mm ⁇ 150 mm, and the PET films that had been peeled off were peeled off and attached to stainless steel plates. It was left in an environment at 150 ° C. for 1 hour. Thereafter, one end was pulled in a 180 ° direction at a peeling speed of 30000 mm / min, and the force for starting peeling was defined as a high-speed peeling force after heat resistance.
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Abstract
Description
前記(メタ)アクリル系樹脂(A)が、アルキル基の炭素数が4以下である(メタ)アクリル酸アルキルエステルを30.0~99.9質量%の範囲内の量で含む重合性単量体を溶液重合して得られ、かつ下記(a1)、(a2)および(a3)の特性を有し、
前記ヘキサメチレンジイソシアネート系架橋剤(B)を、前記表面保護フィルム用粘着剤組成物から形成される粘着剤層のゲル分率が90.0~99.9質量%の範囲内になる量で含有することを特徴としている。
(a2)分子量分布(Mw/Mn)が4~9の範囲内にあり、
(a3)酸価が2mgKOH/g以下である。
前記粘着剤層が、(メタ)アクリル系樹脂(A)が、アルキル基の炭素数が4以下である(メタ)アクリル酸アルキルエステルを30.0~99.9質量%の範囲内の量で含む重合性単量体を溶液重合して得られ、かつ上記(a1)、(a2)および(a3)の特性を有し、
前記ヘキサメチレンジイソシアネート系架橋剤(B)を、前記表面保護フィルム用粘着剤組成物から形成される粘着剤層のゲル分率が90.0~99.9質量%の範囲内になる量で含有する表面保護フィルム用粘着剤組成物から成ることを特徴としている。
本発明の表面保護フィルム用粘着剤組成物は、(メタ)アクリル系樹脂(A)とヘキサメチレンジイソシアネート系架橋剤(B)(以下、HDI系架橋剤(B)ともいう)とを含有すると共に、この粘着剤組成物は、通常は、有機溶媒(C)を含有している。
(メタ)アクリル系樹脂(A)は、アルキル基の炭素数が4以下の(メタ)アクリル酸アルキルエステル(i)を含む重合性単量体の重合体であり、前記重合性単量体を有機溶媒中で溶液重合して得られる。このように、(メタ)アクリル系樹脂(A)は、前記(i)由来の構造単位を有する。
単量体(i)は、例えば、下記式(i-1)で表される。
R1は水素原子またはメチル基であり、R2は炭素数4以下のアルキル基である。
単量体(ii)は、例えば、下記式(ii-1)で表される。
R3は水素原子またはメチル基である。R4は炭素数4以下のアルキル基以外であり、かつ水酸基、アミノ基、アミド基、シアノ基およびカルボキシル基などの極性基を有しない有機基である。
ここで、R5はアルキレン基であり、R6はアルキル基またはアリール基であり、nは1以上の整数である。アルキレン基の炭素数は、通常1~10、好ましくは1~5である。アルキル基の炭素数は、通常1~10、好ましくは1~4であり、アリール基の炭素数は、通常6~10、好ましくは6である。nは、好ましくは1~20、より好ましくは1~4、さらに好ましくは1~2である。
単量体(iii)に含まれる酸基としては、例えば、カルボキシル基、酸無水物基、リン酸基および硫酸基が挙げられる。
単量体(iv)としては、例えば、水酸基含有単量体、アミノ基含有単量体、アミド基含有単量体、窒素系複素環含有単量体およびシアノ基含有単量体が挙げられる。ただし、酸基含有単量体を除く。
その他の単量体(v)としては、例えば、酢酸ビニルおよびプロピオン酸ビニル等のビニルエステル類;塩化ビニルおよび塩化ビニリデン等のハロゲン化オレフィン類;スチレンおよびα-メチルスチレン等のスチレン系モノマー;ブタジエン、イソプレンおよびクロロプレン等のジエン系モノマーが挙げられる。
上記のような単量体を用いた(メタ)アクリル系樹脂(A)は、溶液重合法により製造される。溶液重合法は、不純物の混入が少ないため、この方法により製造された(メタ)アクリル系樹脂(A)を含有する粘着剤組成物は、表示装置等の光学部材への使用に適する。
(メタ)アクリル系樹脂(A)は、ゲルパーミエーションクロマトグラフィー法(GPC法)により測定される重量平均分子量(Mw)が、ポリスチレン換算値で、120万~200万であり、好ましくは130万~180万の範囲内にある。Mwが前記下限値以上であると、(メタ)アクリル系樹脂(A)の凝集力が向上し、粘着剤層内での(メタ)アクリル系樹脂(A)由来の移行成分が大幅に抑制され、汚染が低減される点で好ましい。また、粘着剤層の耐久性も向上する。Mwが前記上限値以下であると、粘着剤組成物の塗工性の点で好ましい。
本発明の粘着剤組成物は、HDI系架橋剤(B)を含有する。HDI系架橋剤(B)により、(メタ)アクリル系樹脂(A)を架橋することで、架橋体(ネットワークポリマー)を形成することができ、耐熱性に優れた粘着剤層を得ることができる。HDI系架橋剤(B)を使用することで、耐熱後の粘着力上昇を抑えることができ、また、粘着剤層が柔らかくなるため濡れ性がよくなり、光学用機能性フィルム等の被着物への貼合工程にて不具合が起こりにくくなる。
本発明の粘着剤組成物は、その塗布性を調製するため、有機溶媒(C)を含有することが好ましい。有機溶媒としては、《(メタ)アクリル系樹脂(A)の製造条件》の欄で説明した重合溶媒を有機溶媒としてそのまま利用することが好ましい。例えば、(メタ)アクリル系樹脂(A)および重合溶媒を含む単量体溶液と、HDI系架橋剤(B)とを混合して、粘着剤組成物を調製することができる。本発明の粘着剤組成物において、有機溶媒の含有量は、通常20~90質量%、好ましくは30~80質量%である。
本発明の粘着剤組成物は、上記成分のほか、本発明の効果を損なわない範囲で、帯電防止剤、酸化防止剤、光安定剤、金属腐蝕防止剤、粘着付与剤、可塑剤、架橋促進剤、界面活性剤、前記(A)以外の(メタ)アクリル系樹脂およびリワーク剤などの他の成分を含有していてもよい。
本発明の表面保護フィルム用粘着剤組成物は、(メタ)アクリル系樹脂(A)と、HDI系架橋剤(B)と、必要に応じて他の成分とを、従来公知の方法により混合することで調製することができる。例えば、(メタ)アクリル系樹脂(A)を溶液重合法で合成する際に得られた(メタ)アクリル系樹脂(A)を含む単量体溶液に、HDI系架橋剤(B)と、必要に応じて他の成分とを配合することが挙げられる。
粘着剤層は、上述の粘着剤組成物から形成される。例えば、上述の粘着剤組成物中の架橋反応を進めることにより、具体的には(メタ)アクリル系樹脂(A)をHDI系架橋剤(B)で架橋することにより、前記粘着剤層が得られる。
本発明の表面保護フィルムは、上述の表面保護フィルム用粘着剤組成物より形成された粘着剤層を有する。表面保護フィルムは、さらに剥離フィルムを有してもよく、例えば、前記粘着剤層をフィルム状支持体の一方の面に形成し、前記粘着剤層の前記フィルム状支持体を有しない他方の面に剥離フィルムが貼着された表面保護フィルムが挙げられる。
(メタ)アクリル系樹脂(A)について、ゲルパーミエーションクロマトグラフィー法(GPC法)により、下記条件で、重量平均分子量(Mw)および数平均分子量(Mn)を求めた。
・測定装置:HLC-8320GPC(東ソー(株)製)
・GPCカラム構成:以下の4連カラム(すべて東ソー(株)製)
(1)TSKgel HxL-H(ガードカラム)
(2)TSKgel GMHxL
(3)TSKgel GMHxL
(4)TSKgel G2500HxL
・流速:1.0mL/min
・カラム温度:40℃
・サンプル濃度:1.5%(w/v)(テトラヒドロフランで希釈)
・移動相溶媒:テトラヒドロフラン
・標準ポリスチレン換算
〔酸価〕
アクリル系樹脂1gを中和するのに必要な水酸化カリウムのmg数を計算により算出した。
撹拌機、還流冷却器、温度計および窒素導入管を備えた反応装置に、n-ブチルアクリレート95.0部、4-ヒドロキシブチルアクリレート5.0部、および酢酸エチル溶媒100部を仕込み、窒素ガスを導入しながら80℃に昇温した。次いで、2,2'-アゾビスイソブチロニトリル0.1部を加え、窒素ガス雰囲気下、80℃で6時間重合反応を行った。反応終了後、酢酸エチルにて希釈し、固形分濃度20質量%のポリマー溶液を調製した。得られた(メタ)アクリル系樹脂A1のMwは160万であり、Mw/Mnは6.0であった。計算により求めた酸価は0であった。
重合性単量体を表1-1に記載したとおりに配合し、酢酸エチル溶媒の配合量を115質量部に変更したこと以外は合成例A1と同様に重合反応およびポリマー溶液の調製を行い、(メタ)アクリル系樹脂A2を含む、固形分濃度20質量%のポリマー溶液を得た。結果を表1-1に示す。
重合性単量体を表1-1に記載したとおりに配合し、酢酸エチル溶媒の配合量を115質量部に変更したこと以外は合成例A1と同様に重合反応およびポリマー溶液の調製を行い、(メタ)アクリル系樹脂A3を含む、固形分濃度20質量%のポリマー溶液を得た。結果を表1-1に示す。
重合性単量体を表1-1に記載したとおりに配合し、酢酸エチル溶媒の配合量を115質量部に変更したこと以外は合成例A1と同様に重合反応およびポリマー溶液の調製を行い、(メタ)アクリル系樹脂A4を含む、固形分濃度20質量%のポリマー溶液を得た。結果を表1-1に示す。
重合性単量体を表1-1に記載したとおりに配合し、酢酸エチル溶媒の配合量を115質量部に変更したこと以外は合成例A1と同様に重合反応およびポリマー溶液の調製を行い、(メタ)アクリル系樹脂A5を含む、固形分濃度20質量%のポリマー溶液を得た。結果を表1-1に示す。
重合性単量体を表1-1に記載したとおりに配合し、酢酸エチル溶媒の配合量を115質量部に変更したこと以外は合成例A1と同様に重合反応およびポリマー溶液の調製を行い、(メタ)アクリル系樹脂A6を含む、固形分濃度20質量%のポリマー溶液を得た。結果を表1-1に示す。
重合性単量体を表1-1に記載したとおりに配合し、酢酸エチル溶媒の配合量を115質量部に変更したこと以外は合成例A1と同様に重合反応およびポリマー溶液の調製を行い、(メタ)アクリル系樹脂A7を含む、固形分濃度20質量%のポリマー溶液を得た。結果を表1-1に示す。
重合性単量体を表1-1に記載したとおりに配合し、酢酸エチル溶媒の配合量を115質量部に変更したこと以外は合成例A1と同様に重合反応およびポリマー溶液の調製を行い、(メタ)アクリル系樹脂A8を含む、固形分濃度20質量%のポリマー溶液を得た。結果を表1-1に示す。
重合性単量体を表1-2に記載したとおりに配合し、酢酸エチル溶媒の配合量を130質量部に変更したこと以外は合成例A1と同様に重合反応およびポリマー溶液の調製を行い、(メタ)アクリル系樹脂A9を含む、固形分濃度20質量%のポリマー溶液を得た。結果を表1-2に示す。
重合性単量体を表1-2に記載したとおりに配合し、酢酸エチル溶媒の配合量を160質量部に変更したこと以外は合成例A1と同様に重合反応およびポリマー溶液の調製を行い、(メタ)アクリル系樹脂A10を含む、固形分濃度20質量%のポリマー溶液を得た。結果を表1-2に示す。
撹拌機、還流冷却器、温度計および窒素導入管を備えた反応装置に、n-ブチルアクリレート95.0部、4-ヒドロキシブチルアクリレート5.0部、および酢酸エチル溶媒130部を仕込み、窒素ガスを導入しながら80℃に昇温した。次いで、2,2'-アゾビスイソブチロニトリル0.1部を加え、窒素ガス雰囲気下、重合反応を開始した。反応開始して3時間後に2,2'-アゾビスイソブチロニトリルを0.1質量部追加してさらに80℃で3時間重合反応を行った。反応終了後、酢酸エチルにて希釈し、(メタ)アクリル系樹脂A11を含む、固形分濃度20質量%のポリマー溶液を調製した。結果を表1-2に示す。
重合性単量体を表1-2に記載したとおりに配合したこと以外は合成例A1と同様に重合反応およびポリマー溶液の調製を行い、(メタ)アクリル系樹脂A12を含む、固形分濃度20質量%のポリマー溶液を得た。結果を表1-2に示す。
重合性単量体を表1-2に記載したとおりに配合したこと以外は合成例A1と同様に重合反応およびポリマー溶液の調製を行い、(メタ)アクリル系樹脂A13を含む、固形分濃度20質量%のポリマー溶液を得た。結果を表1-2に示す。
重合性単量体を表1-2に記載したとおりに配合し、酢酸エチル溶媒の配合量を160質量部に変更したこと以外は合成例A1と同様に重合反応およびポリマー溶液の調製を行い、(メタ)アクリル系樹脂A14を含む、固形分濃度20質量%のポリマー溶液を得た。結果を表1-2に示す。
重合性単量体を表1-2に記載したとおりに配合し、酢酸エチル溶媒の配合量を115質量部に変更したこと以外は合成例A1と同様に重合反応およびポリマー溶液の調製を行い、(メタ)アクリル系樹脂A15を含む、固形分濃度20質量%のポリマー溶液を得た。結果を表1-2に示す。
(1)粘着剤組成物の調製
合成例A1で得られた(メタ)アクリル系ポリマー溶液(固形分濃度20質量%)と、HDI系架橋剤(B)として(B1):旭化成ケミカルズ(株)製「TPA-100」とを混合して、粘着剤組成物を得た。なお、各成分の比率は、合成例A1で得られた(メタ)アクリル系ポリマー溶液に含まれる樹脂A1;100部に対して、(B1)5部となる量である(いずれも固形分値)。
泡抜け後、剥離処理されたポリエチレンテレフタレートフィルム(PETフィルム)上に、上記(1)で得られた粘着剤組成物をドクターブレードを用いて液温25℃で塗布し、90℃で3分間乾燥して、乾燥膜厚20μmの塗膜を形成した。塗膜の前記PETフィルムの貼付面とは反対面に、剥離処理されたPETフィルムをさらに貼り合わせ、23℃/50%RH環境下で7日間静置して熟成させて、2枚のPETフィルムに挟まれた厚さ20μmの粘着剤層を有する表面保護フィルムを得た。
実施例1において、配合組成を表2-1および2-2に記載したとおりに変更したこと以外は実施例1と同様にして、粘着剤組成物および表面保護フィルムを得た。
B1:ヘキサメチレンジイソシアネートのイソシアヌレート体
(旭化成ケミカルズ(株)製、TPA-100)
B2:ヘキサメチレンジイソシアネートの3分子付加物
(日本ポリウレタン工業(株)製、コロネートHX)
B3:トリレンジイソシアネートのトリメチロールプロパンアダクト体
(日本ポリウレタン工業(株)製、コロネートL、固形分濃度75質量%)
B4:メタキシレンジイソシアネート系アダクト型
(三井化学(株)製、D-120N)
B5:エポキシ系硬化剤
(三菱ガス化学(株)製、テトラッドC)
[評価]
〔ゲル分率〕
実施例・比較例で得られた表面保護フィルムから、粘着剤層約0.1gをサンプリング瓶に採取し、酢酸エチル30mLを加えて4時間振盪した後、このサンプル瓶の内容物を200メッシュのステンレス製金網で濾過し、金網上の残留物を100℃で2時間乾燥して乾燥重量を測定した。次式により、粘着剤層のゲル分率を求めた。
・ゲル分率(%)=(乾燥重量/粘着剤層採取重量)×100(%)
〔ITO腐食性〕
10mm×100mmにカットしたITO蒸着PETフィルムに、実施例・比較例で得られた表面保護フィルムを10mm×60mmにカットして片側の剥離フィルムを剥がして貼り付け、50℃、5atmで20分間オートクレーブ処理を行った。次いで、1時間室温で静置した後、60℃、90%RH環境下に500時間置き、23℃、65%RHで1時間静置した後、ITO蒸着フィルムの抵抗値を測定し、あらかじめ測定しておいた上記処理を行っていない表面保護フィルムの抵抗値に対する抵抗値の変化率を求め、以下の基準で評価した。なお、抵抗値の測定には、テスター(三和電気計器(株)製、デジタルマルチメーター PC510)を用いた。
(基準)
・AA:抵抗値の変化率が10%未満であった。
・CC:抵抗値の変化率が10%以上であった。
実施例・比較例で得られた表面保護フィルムから剥離処理されたPETフィルムを剥がし、2.5cm×15cmに裁断し、ステンレス板上に貼付した。80℃で24時間放置した後、ステンレス板から保護フィルムを剥がし、保護フィルムを貼り合わせていた、ステンレス板表面の汚染の有無を目視で確認し、下記基準により評価した。
(基準)
・AA:全く汚染は観察されなかった
・BB:わずかに粘着剤層による曇りが観察された
・CC:はっきりとした粘着剤層による汚染が観察された
〔低速剥離力〕
実施例・比較例で得られた表面保護フィルムを25mm×150mmに裁断し、それぞれ剥離処理されたPETフィルムを剥がして、ステンレス板に貼り付けた。25℃、湿度50%の環境下に24時間放置した。その後、片端を、剥離速度300mm/minで180°方向に引っ張り、剥離を開始する力を低速剥離力とした。
実施例・比較例で得られた表面保護フィルムを25mm×150mmに裁断し、それぞれ剥離処理されたPETフィルムを剥がして、ステンレス板に貼り付けた。25℃、湿度50%の環境下に24時間放置した。その後、片端を、引き剥がし速度30000mm/minで180°方向に引っ張り、剥離を開始する力を初期の高速剥離力とした。
実施例・比較例で得られた表面保護フィルムを40mm×150mmに裁断し試験片を作成した。ステンレス板上で試験片の両端を持ち、試験片の中心だけが、ステンレス板に接触するように近付けた後、試験片の両端を放し、試験片全体が、ステンレス板に濡れ広がる(密着する)までの時間を測定し、下記基準により評価した。
(基準)
・AA:20秒未満
・BB:20秒以上、60秒未満
・CC:60秒以上
Claims (3)
- (メタ)アクリル系樹脂(A)とヘキサメチレンジイソシアネート系架橋剤(B)とを含有する表面保護フィルム用粘着剤組成物であって、
前記(メタ)アクリル系樹脂(A)が、アルキル基の炭素数が4以下である(メタ)アクリル酸アルキルエステルを30.0~99.9質量%の範囲内の量で含む重合性単量体を溶液重合して得られ、かつ下記(a1)、(a2)および(a3)の特性を有し、
前記ヘキサメチレンジイソシアネート系架橋剤(B)を、前記表面保護フィルム用粘着剤組成物から形成される粘着剤層のゲル分率が90.0~99.9質量%の範囲内になる量で含有することを特徴とする表面保護フィルム用粘着剤組成物;
(a1)ゲルパーミエーションクロマトグラフィー法(GPC法)により測定されたポリスチレン換算の重量平均分子量(Mw)が120万~200万の範囲内にあり、
(a2)分子量分布(Mw/Mn)が4~9の範囲内にあり、
(a3)酸価が2mgKOH/g以下である。 - 前記(メタ)アクリル系樹脂(A)100質量部に対して前記ヘキサメチレンジイソシアネート系架橋剤(B)を2~15質量部の範囲内の量で含有することを特徴とする請求項1に記載の表面保護フィルム用粘着剤組成物。
- フィルム状支持体と、前記フィルム状支持体の少なくとも一方の面に形成された粘着剤層とを有する表面保護フィルムであって、
前記粘着剤層が、請求項1または2に記載の表面保護フィルム用粘着剤組成物から成ることを特徴とする表面保護フィルム。
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