WO2017188120A1 - 自己粘着性層 - Google Patents
自己粘着性層 Download PDFInfo
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- WO2017188120A1 WO2017188120A1 PCT/JP2017/015904 JP2017015904W WO2017188120A1 WO 2017188120 A1 WO2017188120 A1 WO 2017188120A1 JP 2017015904 W JP2017015904 W JP 2017015904W WO 2017188120 A1 WO2017188120 A1 WO 2017188120A1
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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
- C09J7/10—Adhesives in the form of films or foils without carriers
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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
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/06—Interconnection of layers permitting easy separation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
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- 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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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/08—Homopolymers or copolymers of acrylic acid esters
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/10—Homopolymers or copolymers of methacrylic acid esters
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J5/08—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers using foamed adhesives
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/21—Paper; Textile fabrics
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/385—Acrylic polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0025—Crosslinking or vulcanising agents; including accelerators
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/29—Compounds containing one or more carbon-to-nitrogen double bonds
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/408—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the adhesive layer
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- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/414—Additional features of adhesives in the form of films or foils characterized by the presence of essential components presence of a copolymer
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- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/20—Presence of organic materials
- C09J2400/22—Presence of unspecified polymer
- C09J2400/226—Presence of unspecified polymer in the substrate
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/20—Presence of organic materials
- C09J2400/24—Presence of a foam
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- 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
- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/20—Presence of organic materials
- C09J2400/28—Presence of paper
- C09J2400/283—Presence of paper in the substrate
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- C09J2433/00—Presence of (meth)acrylic polymer
Definitions
- the present invention relates to a self-adhesive layer and a self-adhesive laminate.
- a sheet-like member having self-adhesiveness (hereinafter, referred to as “self-adhesive sheet” or “self-adhesive layer”) is used as an adhesive sheet that is applied to a smooth adherend such as a window glass. Is being used.
- self-adhesive sheet adhesion methods adhesive adhesion that utilizes the adhesion of the sheet material itself, and adsorption to the adherend due to the suction cup effect that utilizes the fine pores formed in the sheet.
- a self-adhesive sheet that adheres by combining the two adhesive modes is also used.
- the self-adhesive sheet is suitably used for various applications such as interior decoration materials such as interior decoration materials such as wallpaper, and advertising and sticking materials such as posters and stickers.
- a substrate such as a resin film is usually laminated on the self-adhesive layer, and decoration such as printing is applied to the substrate.
- a laminate having a self-adhesive layer and a support layer made of a substrate is referred to as a “self-adhesive laminate”.
- Patent Document 1 foams a resin composition containing a (meth) acrylate copolymer resin having no N-methylol group in the molecule and an oxazoline crosslinking agent.
- a sheet obtained by coating the foamed product on a substrate and then solidifying the foam by heating and drying is disclosed.
- Patent Document 1 describes that the sheet does not generate formaldehyde or hardly.
- the self-adhesive layer is required to have a property that air does not easily accumulate when affixed to a smooth adherend, so-called “air release”.
- air release the use of the (meth) acrylic acid ester copolymer resin having a carboxyl group increases the gel fraction of the (meth) acrylic acid ester copolymer resin. Irregular irregularities are likely to be formed on the surface, and air bleedability may be insufficient.
- an object of the present invention is to provide a self-adhesive layer and a self-adhesive laminate that are excellent in air bleeding and have reduced formaldehyde generation.
- the present inventors can improve the air release property by the glossiness of the sheet surface being an index of the smoothness of the self-adhesive layer being within a predetermined range. It has been found that this can be achieved while reducing the amount of formaldehyde generated, and the present invention has been completed.
- the first aspect of the present invention is a self-adhesive layer comprising a resin and a reactant of a resin composition containing a crosslinking agent and / or an initiator, and has a glossiness of 33 to 90,
- the self-adhesive layer has a formaldehyde generation amount of 2 ppm or less.
- the “reactant of the resin composition” means at least a conjugate in which a bonding structure is formed in or between the molecules of the polymer constituting the resin contained in the resin composition.
- glossiness means glossiness measured at an incident angle of 60 ° in accordance with JIS Z 8741.
- the “formaldehyde generation amount” means a formaldehyde concentration measured by the following method. After pasting a separator film on the self-adhesive layer of the present invention, a test piece cut out to a size of 200 mm ⁇ 200 mm is prepared. Place the specimen in a 5 L Tedlar bag and seal. 2 L of air was sealed in it, left in a thermostat set at 23 ° C. and 50% RH for 6 hours, and then the concentration of formaldehyde (ppm) in the bag was detected with a detector tube (Gastech, No. 91 L). ).
- the resin is preferably a (meth) acrylic acid ester copolymer resin.
- (meth) acryl means “acryl and / or methacryl”.
- the glass transition temperature of the (meth) acrylic ester copolymer resin is preferably ⁇ 10 ° C. or lower.
- the (meth) acrylic acid ester copolymer resin preferably has an N-methylol group and has a gel fraction of 70% or less.
- the resin composition is preferably a foam.
- the foaming ratio of the foam is preferably 1.1 times or more and 4 times or less.
- the crosslinking agent is preferably a carbodiimide-based crosslinking agent.
- the resin composition preferably includes 100 parts by mass of a (meth) acrylic acid ester copolymer resin and 0.1 to 20 parts by mass of a carbodiimide-based crosslinking agent.
- the self-adhesive layer according to the first aspect of the present invention preferably has a thickness of 0.005 mm to 0.5 mm.
- the second aspect of the present invention is a self-adhesive laminate having the self-adhesive layer according to the first aspect of the present invention and a support layer made of a substrate.
- the substrate is preferably a plastic sheet or a paper substrate.
- the self-adhesive layer of the present invention is a self-adhesive layer comprising a resin and a reactant of a resin composition containing a crosslinking agent and / or an initiator, and has a glossiness of 33 to 90. Yes, the amount of formaldehyde generated is 2 ppm or less.
- the glossiness of the self-adhesive layer of the present invention is 33 or more and 90 or less, preferably 37 or more and 90 or less, and more preferably 45 or more and 90 or less.
- the glossiness is within the above range, the air can be easily removed.
- the amount of formaldehyde generated in the self-adhesive layer of the present invention is 2 ppm or less, preferably 1 ppm or less, more preferably 0.5 ppm or less, and further preferably 0.1 ppm or less.
- the self-adhesive layer of the present invention can be suitably used in places and uses where formaldehyde generation is not preferred.
- the resin used in the present invention is not particularly limited as long as the glossiness and formaldehyde generation amount of the self-adhesive layer of the present invention can be within the above appropriate ranges, but a (meth) acrylic acid ester copolymer Resin, polyurethane resin, polyester resin, styrene resin, UV / EB curable resin, olefin resin, alicyclic saturated hydrocarbon resin, and the like. Among them, from the viewpoint of excellent mechanical strength and weather resistance, ) Acrylic ester copolymer resin is preferred.
- the glass transition temperature of the (meth) acrylic acid ester copolymer resin that can be used in the present invention is preferably ⁇ 10 ° C. or lower, and more preferably ⁇ 13 ° C. or lower.
- self-adhesive strength refers to the peel strength between the self-adhesive layer and the adherend
- layer strength refers to the breaking strength of the self-adhesive layer itself.
- (Meth) acrylic acid ester copolymer resin is 50% by mass or more of monomer units from (meth) acrylic acid ester monomers and 50% by mass of monomer units from monomers copolymerizable therewith. It is preferably composed of 70% by mass or more of monomer units from (meth) acrylic acid ester monomers and 30% by mass or less of monomer units from monomers copolymerizable therewith. More preferably, it is composed of 80% by mass or more of monomer units from a (meth) acrylic acid ester monomer and 20% by mass or less of monomer units from a monomer copolymerizable therewith.
- the (meth) acrylic acid ester copolymer resin preferably has an N-methylol group.
- the N-methylol group possessed by the (meth) acrylic acid ester copolymer resin is preferably contained in a monomer unit copolymerizable with the (meth) acrylic acid ester monomer. ) It may be contained in the acrylate monomer unit.
- the (meth) acrylic acid ester monomer that can be used in the present invention is not particularly limited. From the viewpoint of making the glass transition temperature of the (meth) acrylic acid ester copolymer resin easy to be ⁇ 10 ° C. or lower, the glass transition temperature. It is preferable to contain a unit of a (meth) acrylate monomer that forms a homopolymer having a temperature of ⁇ 20 ° C. or lower.
- the (meth) acrylate monomer that forms a homopolymer having a glass transition temperature of ⁇ 20 ° C. or lower is not particularly limited.
- ethyl acrylate the glass transition temperature of the homopolymer is ⁇ 24 ° C.
- (meth) acrylic acid alkoxyalkyl ester forming a homopolymer having a glass transition temperature of ⁇ 20 ° C. or lower (meth) acrylic acid alkoxyalkyl ester forming a homopolymer having a glass transition temperature of ⁇ 20 ° C. or lower is more preferable. If the glass transition temperature of the (meth) acrylic acid ester copolymer resin can be adjusted to ⁇ 10 ° C.
- methyl acrylate (the glass transition temperature of the homopolymer is 10 ° C.), methyl methacrylate (same as above) 105 ° C.), ethyl methacrylate (63 ° C.), n-propyl methacrylate (25 ° C.), n-butyl methacrylate (20 ° C.), and the like.
- acrylic acid ester monomers may be used alone or in combination of two or more.
- Monomers copolymerizable with (meth) acrylic acid ester monomers include N-methylol groups such as N-methylolacrylamide and N-methylolmethacrylamide. It is preferable to use a monomer having By using a monomer having an N-methylol group, the layer strength is increased and the adhesion to the substrate is also increased. As a result, it becomes easy to produce a self-adhesive layer and a self-adhesive laminate having an appropriate self-adhesive force and excellent in smoothness.
- the proportion of the monomer having an N-methylol group is such that the monomer introduced from the monomer having an N-methylol group, with the (meth) acrylic acid ester copolymer resin being 100% by mass.
- the unit is preferably 0.1% by mass or more and 10% by mass or less, and more preferably 0.5% by mass or more and 5% by mass or less.
- the copolymerization monomer another monomer may be used instead of the monomer having an N-methylol group or in addition to the monomer having an N-methylol group.
- the monomer used other than the monomer having an N-methylol group is not particularly limited as long as the glass transition temperature of the (meth) acrylate copolymer resin can be ⁇ 10 ° C. or lower. Specific examples include ⁇ , ⁇ -ethylenically unsaturated polyvalent carboxylic acid complete ester, alkenyl aromatic monomer, vinyl cyanide monomer, carboxylic acid unsaturated alcohol ester, olefin monomer, and other functional groups. And the like. These monomers may be used individually by 1 type, and may use 2 or more types together.
- ⁇ , ⁇ -ethylenically unsaturated polyvalent carboxylic acid complete ester examples include dimethyl fumarate, diethyl fumarate, dimethyl maleate, diethyl maleate, dimethyl itaconate and the like.
- alkenyl aromatic monomer examples include styrene, ⁇ -methylstyrene, methyl ⁇ -methylstyrene, vinyltoluene and the like.
- vinyl cyanide monomer examples include acrylonitrile, methacrylonitrile, ⁇ -chloroacrylonitrile, ⁇ -ethylacrylonitrile and the like.
- carboxylic acid unsaturated alcohol ester monomer examples include vinyl acetate.
- olefin monomer examples include ethylene, propylene, butene, pentene and the like.
- a monomer having a functional group may be used for the purpose of efficiently performing cross-linking between the inside of the copolymer or between the copolymers.
- the functional group include an organic acid group, a hydroxyl group, an amino group, an amide group, a mercapto group, and an epoxy group.
- the monomer having an organic acid group is not particularly limited, and typical examples thereof include monomers having an organic acid group such as a carboxyl group, an acid anhydride group, and a sulfonic acid group. In addition to these, monomers containing sulfenic acid groups, sulfinic acid groups, phosphoric acid groups, and the like can also be used.
- the monomer having a carboxyl group include, for example, ⁇ , ⁇ -ethylenically unsaturated monocarboxylic acids such as acrylic acid, methacrylic acid, and crotonic acid, and ⁇ , ⁇ such as itaconic acid, maleic acid, and fumaric acid.
- ⁇ , ⁇ -ethylenically unsaturated polyvalent carboxylic acid partial esters such as monomethyl itaconate, monobutyl maleate and monopropyl fumarate can be exemplified.
- the monomer having a sulfonic acid group examples include allyl sulfonic acid, methallyl sulfonic acid, vinyl sulfonic acid, styrene sulfonic acid, ⁇ , ⁇ -unsaturated sulfonic acid such as acrylamide-2-methylpropane sulfonic acid, And salts thereof.
- the monomer unit derived therefrom is 100% by mass of (meth) acrylic acid ester copolymer resin, preferably 0.1% by mass or more and 20% by mass or less, More preferably, it is used for the polymerization in such an amount that it is 0.5 to 15% by mass.
- the amount of the monomer having an organic acid group is within the above range, it becomes easy to keep the viscosity of the polymerization system in an appropriate range at the time of polymerization, and the crosslinking of the copolymer proceeds excessively. Thus, it becomes easy to prevent the self-adhesiveness of the self-adhesive layer and the self-adhesive laminate from being impaired.
- the monomer unit having an organic acid group can be easily and preferably introduced into the (meth) acrylic acid ester copolymer resin by polymerization of a monomer having an organic acid group. After the acrylic ester copolymer resin is formed, an organic acid group may be introduced by a known polymer reaction.
- Examples of the monomer having a hydroxyl group include (meth) acrylic acid hydroxyalkyl esters such as (meth) acrylic acid 2-hydroxyethyl and (meth) acrylic acid 3-hydroxypropyl.
- Examples of the monomer having an amino group include N, N-dimethylaminomethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, and aminostyrene.
- Examples of the monomer having an amide group include ⁇ , ⁇ -ethylenically unsaturated carboxylic acid amide monomers such as acrylamide, methacrylamide, and N, N-dimethylacrylamide.
- Examples of the monomer having an epoxy group include glycidyl (meth) acrylate and allyl glycidyl ether.
- the monomer unit derived therefrom is 10% by mass or less based on 100% by mass of the (meth) acrylic acid ester copolymer resin. It is preferable to use it for polymerization in such an amount.
- the amount of the functional group other than the organic acid group used is 10% by mass or less, it becomes easy to keep the viscosity of the polymerization system at the time of polymerization within an appropriate range, and the crosslinking of the copolymer proceeds excessively. Thus, it becomes easy to prevent the self-adhesiveness of the self-adhesive layer and the self-adhesive laminate from being impaired.
- a polyfunctional monomer having a plurality of polymerizable unsaturated bonds may be used in combination as a monomer for copolymerization.
- the polyfunctional monomer preferably has the unsaturated bond at the terminal.
- polyfunctional monomer examples include 1,6-hexanediol di (meth) acrylate, 1,2-ethylene glycol di (meth) acrylate, 1,12-dodecanediol di (meth) acrylate, polyethylene glycol di ( (Meth) acrylate, polypropylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, pentaerythritol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, ditrimethylolpropane tri Multifunctional (meth) acrylates such as (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and 2,4-bis (trichloro Other substituted triazines, such as chill)
- monoethylenically unsaturated aromatic ketones such as 4-acryloxy benzophenone can be used.
- Polyfunctional (meth) acrylate is preferable, and pentaerythritol di (meth) acrylate, pentaerythritol tri (meth) acrylate, and pentaerythritol tetra (meth) acrylate are more preferable.
- a polyfunctional monomer may be used individually by 1 type, and may use 2 or more types together.
- the (meth) acrylic acid ester copolymer resin can be obtained by copolymerizing a (meth) acrylic acid ester monomer and a copolymerization monomer.
- the polymerization method for obtaining the (meth) acrylic acid ester copolymer resin is not particularly limited, and may be any of solution polymerization, emulsion polymerization, suspension polymerization, bulk polymerization and the like, and may be other methods.
- the property of the (meth) acrylic acid ester copolymer resin may be a solid or a dispersion, but if a product obtained as an emulsion or a dispersion by emulsion polymerization or dispersion polymerization is used as it is, crosslinking occurs. In mixing with an agent or a conductive compound, the operation is easy, and it is convenient for foaming the obtained emulsion or dispersion.
- the gel fraction of the (meth) acrylic acid ester copolymer resin is preferably 70% or less, and more preferably 65% or less.
- the gel fraction means that a 500 mg sample of a (meth) acrylic acid ester copolymer resin is immersed in 100 ml of ethyl acetate at room temperature for 3 days, and then the insoluble matter is filtered through an 80-mesh wire mesh for 15 hours.
- the cross-linking agent or initiator used in the present invention is not particularly limited as long as the glossiness and formaldehyde generation amount of the self-adhesive layer of the present invention can be within the above appropriate ranges. It can select suitably according to the crosslinking method.
- carbodiimide-based crosslinking agents such as polyethylene glycol diglycidyl ether, glycerin polyglycidyl ether, sorbitol polyglycidyl ether, bisphenol A polyglycidyl ether; aziridine compounds such as ethyleneimine derivatives such as aldehyde and acrolein; tolylene diisocyanate , Trimethylolpropane tolylene diisocyanate, diphenylmethane triisocyanate, etc., polyfunctional isocyanate crosslinking agent; oxazoline crosslinking agent; metal salt crosslinking agent; metal chelate crosslinking agent; peroxide crosslinking agent; benzophenone, acetophenone Thioxanthone-based, sulfonium-based, iodonium-based photoinitiators, and the like.
- epoxy resins such as polyethylene glycol diglycidyl ether, glycerin polyglycidyl
- a cross-linking agent that causes formaldehyde such as melamine-formaldehyde resin, urea-formaldehyde resin, and phenol formaldehyde resin.
- formaldehyde such as melamine-formaldehyde resin, urea-formaldehyde resin, and phenol formaldehyde resin.
- a (meth) acrylic acid ester copolymer resin having an N-methylol group is used as the resin
- a carbodiimide type is used from the viewpoint of developing excellent strength and reducing the amount of formaldehyde generated during use. It is preferable to use a crosslinking agent.
- carbodiimide-based crosslinking agent (Carbodiimide-based crosslinking agent) Although the carbodiimide type crosslinking agent that can be used in the present invention is not particularly limited, a compound having two or more carbodiimide groups in one molecule is preferably used. A known carbodiimide compound can be used as such a compound.
- the known carbodiimide compound may be synthesized or a commercially available product may be used.
- Examples of commercially available carbodiimide compounds include “DICNAL HX” manufactured by DIC, “Carbodilite (registered trademark)” manufactured by Nisshinbo Chemical Co., Ltd., and the like.
- a polycarbodiimide compound obtained by carbodiimidizing a polyisocyanate by a decarboxylation condensation reaction in the presence of a carbodiimidization catalyst can be used.
- raw material polyisocyanate examples include hexamethylene diisocyanate (HDI), hydrogenated xylylene diisocyanate (H6XDI), xylylene diisocyanate (XDI), 2,2,4-trimethylhexamethylene diisocyanate (TMHDI), and 1,12-diisocyanate decane.
- HDI hexamethylene diisocyanate
- H6XDI hydrogenated xylylene diisocyanate
- XDI xylylene diisocyanate
- TMHDI 2,2,4-trimethylhexamethylene diisocyanate
- 1,12-diisocyanate decane examples include 1,12-diisocyanate decane.
- DI norbornane diisocyanate
- NBDI norbornane diisocyanate
- OCDI 2,4-bis- (8-isocyanate octyl) -1,3-dioctylcyclobutane
- HMDI 4,4′-dicyclohexylmethane diisocyanate
- TMXDI tetramethylxylylene diene Isocyanate
- IPDI isophorone diisocyanate
- TIDI 2,4,6-triisopropylphenyl diisocyanate
- TCDI 4,4′diphenylmethane diiso Anate
- MDI tolylene diisocyanate
- TDI tolylene diisocyanate
- HTDI hydrogenated tolylene diisocyanate
- HTDI hydrogenated tolylene diisocyanate
- the carbodiimidization catalyst is preferably an organophosphorus compound, and phospholene oxides are particularly preferred from the viewpoint of activity.
- phospholene oxides are particularly preferred from the viewpoint of activity.
- the carbodiimide-based crosslinking agent includes the carbodiimide group it has and the functional group in the (meth) acrylic acid ester copolymer resin.
- a carbodiimide-based crosslinking agent is preferable because it is particularly excellent in crosslinking effect at low temperature and can form a self-adhesive layer excellent in strength and self-adhesiveness.
- a (meth) acrylic acid ester copolymer resin having an N-methylol group and a melamine-based crosslinking agent are often used in combination for the purpose of increasing strength.
- an acrylic ester copolymer having an N-methylol group and a melamine crosslinking agent are used in combination, a large amount of formaldehyde is generated during the crosslinking reaction and remains in the self-adhesive layer. Sometimes formaldehyde was generated.
- a carbodiimide-based crosslinking agent even when a (meth) acrylic acid ester copolymer resin having an N-methylol group is used, excellent strength is exhibited and the amount of formaldehyde generated during use is extremely reduced. Is possible.
- the amount of the carbodiimide crosslinking agent used is a solid content with respect to 100 parts by mass of the (meth) acrylic acid ester copolymer resin. As, it is preferable that they are 0.1 mass part or more and 20 mass parts or less, and it is more preferable that they are 0.5 mass part or more and 15 mass parts or less. When the amount of the carbodiimide-based crosslinking agent used is within the above range, it has an appropriate self-adhesive force and can increase the resin strength after crosslinking.
- the resin composition may further contain a formaldehyde scavenger.
- the formaldehyde scavenger that can be used in the present invention is not particularly limited as long as it is a compound that physically adsorbs formaldehyde or chemically reacts with formaldehyde, and is an organic compound including an inorganic compound or a polymer. It may be.
- formaldehyde scavengers include hydroxylamine sulfate, hydroxylamine hydrochloride, ammonium acetate, urea, ethylene urea, dicyandiamide, polyamide resins, triazine compounds, hydrazide compounds and other nitrogen-containing compounds; stabilized chlorine dioxide and other halogen oxides And metal salts such as disodium hydrogen phosphate, zinc sulfate, calcium chloride, and magnesium sulfate; Of these, nitrogen-containing compounds are preferred, and hydroxylamine sulfate is particularly preferred from the viewpoints of availability, handleability, and formaldehyde capture. These formaldehyde scavengers can be used alone or in combination of two or more.
- additives may be added to the resin composition to improve the processability of the self-adhesive layer and the self-adhesive laminate, and to improve the performance of the resulting self-adhesive layer and the self-adhesive laminate, as necessary.
- Examples of additives include foam stabilizers, foaming aids, thickeners, fillers, preservatives, fungicides, gelling agents, flame retardants, anti-aging agents, antioxidants, tackifiers, photosensitizers
- Examples include sensitizers and conductive compounds.
- fatty acid ammonium such as ammonium stearate, sulfonic acid type anionic surfactant such as alkyl sulfosuccinate, quaternary alkyl ammonium chloride, alkylbetaine amphoteric compound, fatty acid alkanolamine and the like can be used.
- sodium lauryl sulfate, sodium alkyldiphenyl ether disulfonate, sodium polyoxyethylene alkylphenol ether sulfate and the like can be used.
- inorganic polymer fine particles such as acrylic polymer particles, fine silica, and reactive inorganic compounds such as magnesium oxide can be used.
- filler calcium carbonate, magnesium carbonate, aluminum hydroxide, magnesium hydroxide, barium hydroxide, clay, kaolin, glass powder and the like can be used.
- antiseptics and fungicides examples include dihydroxydichlorophenylmethane, sodium pentachlorophenate, 2,3,4,6-tetrachloro-4- (methylsulfonyl) pyridine, 2,3,5,6-tetrachloro- 4- (Methylsulfonyl) pyridine, bis (tributyltin) oxide, hexahydro-1,3,5-triethyl-s-triazine, silver complex, zinc complex and the like can be used.
- ammonium salts such as ammonium acetate, ammonium chloride, and ammonium carbonate, alkylphenol alkylene oxide adducts, polyvinyl methyl ether, polypropylene glycol, polyether poly formal, methyl cellulose, hydroxyethyl cellulose, silicone-based heat sensitive agents, etc. are used. it can.
- Flame retardants include phosphate ester compounds, halogen phosphate ester compounds, ammonium polyphosphate, antimony trioxide, zinc borate, barium metaborate, ammonium hydroxide, magnesium hydroxide, tin compounds, organophosphorus compounds, Red phosphorus compounds, silicone flame retardants and the like can be used.
- antioxidant polyphenol-based, hydroquinone-based, hindered amine-based antioxidants and the like can be used.
- tackifiers include gum rosin, tall oil rosin, wood rosin, hydrogenated rosin, disproportionated rosin, polymerized rosin, maleated rosin, rosin / glycerin ester, hydrogenated rosin / glycerin ester and other rosin resins; terpene resins, Terpene resins such as terpene phenol resins and aromatic modified terpene resins; petroleum resins such as aliphatic petroleum resins, alicyclic petroleum resins and aromatic petroleum resins; coumarone indene resins; terpene phenol resins; A compound selected from a series resin; a hydrogenated rosin ester; a disproportionated rosin ester; a xylene resin and the like can be used.
- amines such as n-butylamine, triethylamine, N-methyldiethanolamine, piperidine, N, N-dimethylaniline, triethylenetetramine, diethylaminoethyl (meth) acrylate, urea such as O-tolylthiourea Series compounds, sulfur compounds such as s-benzyl-isothiuronium-p-toluenesulfinate, nitriles such as N, N-dimethyl-p-aminobenzonitrile, phosphorus compounds such as sodium diethylthiophosphate, and the like can be used.
- the photosensitizer itself is not activated by irradiation with ultraviolet rays or the like alone, but when used in combination with a photopolymerization initiator, it has a function of making radical polymerization easier to proceed than in the case of a photopolymerization initiator alone. It is an agent.
- the resin composition is preferably a foam.
- the cross-linked product of the resin composition has a foamed structure, and the self-adhesive layer made of the cross-linked product exhibits adsorptivity due to a suction cup effect utilizing fine pores. it can.
- the method for foaming the resin composition will be described in detail in the foaming step S12 of the production method described later.
- the self-adhesive layer that adheres by adsorption is superior to the self-adhesive layer that adheres only by glue adhesion, and is less likely to have adhesive residue.
- the foamed cells communicate with each other, the air-releasing property is good and anyone can apply it cleanly.
- the self-adhesive laminate of the present invention comprises the self-adhesive layer of the present invention and a support layer comprising a substrate.
- the base material used for the self-adhesive laminate for example, a paper base material, a plastic sheet or the like can be used.
- the paper base material include high-quality paper, art paper, coated paper, craft paper, carton paper, and laminated paper obtained by laminating a thermoplastic resin such as polyethylene on these paper base materials.
- the plastic sheet include polyester resins such as polyethylene terephthalate and polyethylene naphthalate, polystyrene resins, polyvinyl chloride resins, acrylic resins, polycarbonate resins, polyamide resins, and fluorine such as polytetrafluoroethylene.
- the thickness of the support layer made of the substrate is not particularly limited, but is usually 10 ⁇ m to 200 ⁇ m. If what has peelability as a base material is used, after forming a self-adhesive layer on a base material as mentioned later, a base material can be peeled and it can be used as a self-adhesive layer.
- FIG. 1 is a flowchart for explaining a method S10 for producing a self-adhesive layer according to the present invention (hereinafter sometimes abbreviated as “the present production method S10”).
- this manufacturing method S10 has a resin composition production step S1, a molding step S2, and a curing step S3 in this order, and foaming is performed between the resin composition production step S1 and the molding step S2. It is preferable to have step S12.
- each step will be described.
- Resin composition preparation process S1 is a process of preparing the resin composition containing resin and a crosslinking agent and / or an initiator.
- resin composition is produced by mixing resin which is an essential ingredient mentioned above, a crosslinking agent, and / or an initiator, and other ingredients used as needed by arbitrary methods. be able to.
- the resin When the resin is an emulsion or dispersion, it can be easily mixed by simply adding a cross-linking agent and / or initiator and other components to this in the state of an aqueous dispersion, aqueous solution, etc. with stirring. Can do.
- the mixing method is not particularly limited, and may be mixed using, for example, a roll, a Henschel mixer, a kneader, or the like. Mixing may be batch or continuous.
- the batch mixer include a high viscosity raw material kneader and a stirrer such as a crusher, a kneader, an internal mixer, and a planetary mixer.
- the continuous mixer include a Farrell type continuous kneader in which a rotor and a screw are combined, and a screw type kneader having a special structure.
- the single screw extruder and the twin screw extruder currently used for the extrusion process are mentioned. Two or more of these extruders and kneaders may be combined, or a plurality of machines of the same type may be connected and used.
- the form of the resin composition is not particularly limited, but when it is in the form of an emulsion or dispersion, it is convenient to obtain a self-adhesive layer.
- the viscosity of the emulsion or dispersion is preferably 2,000 to 10,000 mPa ⁇ s, more preferably 3,500 to 5,500 mPa ⁇ s.
- Molding step S2 is a step of molding the resin composition into layers.
- the method for molding the resin composition into layers is not particularly limited.
- a suitable method for example, a method of forming a layer by coating the resin composition on a process paper such as a polyester film which has been subjected to a release treatment, and the like can be mentioned.
- a method of coating the resin composition on the process paper generally known coating apparatuses such as a roll coater, a reverse roll coater, a screen coater, a doctor knife coater, a comma knife coater, and a gravure coater can be used, especially a doctor knife coater. When using, a uniform coating thickness can be obtained.
- the resin composition is preferably applied uniformly, and the thickness accuracy during coating, which is an index of application uniformity, is preferably ⁇ 10%, and is ⁇ 5%. Is more preferable.
- it is important that the coating speed at the time of coating for realizing the glossiness exhibited by the self-adhesive layer of the present invention is constant, and the preferable speed varies depending on the coating method.
- the curing step S3 is a step of performing a curing reaction in the resin composition molded into a layer shape.
- a self-adhesive layer formed by solidifying the layered resin composition can be formed on the process paper by performing a curing reaction in the layered resin composition. At this time, if a peelable paper is used as the process paper, the self-adhesive layer can be easily separated from the process paper.
- the method of heating and drying is not particularly limited as long as the resin composition coated on the process paper can be dried and cross-linked, and is not limited to a normal hot air circulation type oven, hot oil circulation hot air chamber, far infrared heater. A chamber or the like can be used.
- the drying temperature is suitably 60 ° C. to 180 ° C., and the drying conditions can be appropriately selected depending on the properties of the resin composition, the coating amount, the coating thickness, and the like.
- the drying is performed at a low temperature (preferably 60 ° C.) as early as possible, and the temperature is gradually raised, and at a later stage a high temperature and a constant temperature (preferably 120 ° C. or higher and 180 ° C. or lower, More preferably, it is preferable to perform multi-stage drying such that it is sufficiently dried at 140 ° C. or higher and 180 ° C. or lower.
- the internal solvent is efficiently dried without forming a film on the surface of the coating liquid in the first half of the curing process, and the crosslinking reaction is promoted in the second half of the curing process.
- the coating liquid can be sufficiently solidified.
- the line speed is usually 5 to 100 m / min, and preferably 10 to 80 m / min. By reducing the line speed, a large amount of heat is applied, so that the layer strength increases, but the productivity decreases, which is not preferable.
- the resin composition can be cured by light such as UV.
- a cured product is obtained by irradiating a resin composition containing a photocurable resin and a photoinitiator with a predetermined amount of light from a lamp such as a high-pressure mercury lamp (main wavelength 365 nm). According to the embodiment in which photocuring is performed in the curing step S3, the curing time can be shortened, so that productivity is increased.
- the density, thickness, hardness, and the like of the obtained self-adhesive layer are adjusted by the composition of the resin composition, the solid content concentration, the conditions for heat drying and solidification, the mixing ratio of bubbles in the form having the foaming step S12 described later, and the like.
- the thickness of the self-adhesive layer is preferably 0.003 to 3 mm, more preferably 0.005 to 1 mm, still more preferably 0.005 to 0.5 mm, and particularly preferably 0.005 to 0.2 mm. . When the thickness is less than 0.003 mm, when the self-adhesive layer of the present invention is used as an article holding material or an article surface protecting material, the impact absorption is inferior, and the article holding force and article surface protecting function are not sufficient.
- the self-adhesive layer is preferably thin.
- the density of the self-adhesive layer is not particularly limited, but is preferably 0.1 to 1.0 g / cm 3 from the viewpoint of impact absorption.
- the self-adhesive layer or self-adhesive laminate obtained by the curing step S3 is usually wound by a winder after a separator film is pasted on the surface having self-adhesiveness, by press cutting, slitting, etc. Cut into a size that is easy to use.
- a self-adhesive layer can be formed on the base material in the curing step S3 by using the base material as the process paper in the molding step S2.
- a self-adhesive laminate having an adsorption layer composed of layers and a support layer composed of a substrate can be produced.
- Foaming process S12 As described above, it is preferable to have the foaming step S12 between the resin composition production step S1 and the molding step S2. By having the foaming step S12, it is possible to produce a self-adhesive layer having a foamed structure and exhibiting adsorptivity due to a suction cup effect utilizing fine pores. Foaming step S12 is a step of foaming the resin composition to obtain a foam of the resin composition.
- an unsolidified foam can be obtained by foaming the resin composition produced in the resin composition production step S1.
- the resin composition is in the form of an emulsion or dispersion, a foamed emulsion or foamed dispersion is obtained.
- the foaming method mechanical foaming is usually employed.
- the expansion ratio may be adjusted as appropriate, but is usually 1.1 to 5 times, and preferably 1.1 to 4 times, more preferably 1.2 to 3 times from the viewpoint of increasing the glossiness. Yes, more preferably 1.5 to 2 times.
- the method of mechanical foaming is not particularly limited, it can be carried out by mixing a certain amount of air into the emulsion of the resin composition and stirring continuously or batchwise with an Oaks mixer, whipper or the like. The foamed emulsion thus obtained becomes creamy.
- a heat-expandable microcapsule containing a suitable synthetic resin such as a vinylidene chloride copolymer as a shell wall and encapsulating a low-boiling hydrocarbon-based compound is used as an acrylic resin emulsion or a butadiene-based synthetic rubber.
- a foam can also be prepared by a method of adding to an emulsion.
- the self-adhesive laminate of the present invention can be subjected to printing on the substrate surface by, for example, offset printing, seal printing, flexographic printing, silk screen printing, gravure printing, laser printer, thermal transfer printer, inkjet printer, etc. it can.
- the self-adhesive laminate having the substrate surface printed thereon can be used as a decorative material for construction, a sticking material for advertisement, a stationery, or a material for toys.
- sales promotion cards so-called POP cards (posters, stickers, displays, etc.), underlays (lunch mats, table mats, stationery, etc.), hamburgers, sushi, fried buckwheat menus, catalogs, panels, Plate (alternative to metal plate), bromide, store price list, information board (sales guidance, direction / destination guidance, confectionery / food, etc.), gardening POP (feed label, etc.), road sign (funeral / house exhibition place) Etc.), display boards (forbidden to enter, forest road work, etc.), calendars (with images), simple whiteboards, mouse pads, coasters, label writer substitute prints, adhesive labels, etc.
- the self-adhesive layer and the self-adhesive laminate of the present invention can be suitably used as an article surface protecting material or an article holding material for various optical parts, precision parts and the like.
- it can stick and peel off any number of times, by forming a self-adhesive layer on substrates such as various boxes and bags, it can be used as a temporary fixing or sealing material when closing the opening.
- fine debris such as foods, luxury goods and daily necessities are likely to be scattered outside, it is suitable as a temporary fixing after opening because the debris hardly adheres to the self-adhesive layer.
- the self-adhesive layer can increase the air tightness in containers such as boxes and bags, by opening the container of perishable foods and luxury items once again through the self-adhesive layer, The fresh state can be maintained and the contents can be prevented from being damaged by oxygen or moisture. Therefore, as described above, it can be used for packages such as confectionery, coffee, tea, cigarettes, detergents, etc. as applications that may be repeatedly opened and closed and applications that require the contents to be kept fresh. .
- the self-adhesive layer and the self-adhesive laminate of the present invention hardly cause adhesive residue even when used in a high temperature and high humidity environment.
- the self-adhesive layer and the self-adhesive laminate of the present invention can prevent the occurrence of adhesive residue even after being placed in an environment where the temperature is 60 ° C. or higher and the humidity is 80% or higher for two weeks. . Therefore, it can be suitably used even in a severe environment of high temperature and high humidity such as outdoors in summer.
- the effect of preventing adhesive residue when used in a normal environment such as an air-conditioned room is higher than before. It can be said.
- the self-adhesive layer and the self-adhesive laminate of the present invention can reduce the amount of formaldehyde generated, and by appropriately setting the composition of the resin composition, the amount of formaldehyde generated is less than the detection limit (for example, 0 Less than 1 ppm). Therefore, it can be suitably used in places and uses where generation of formaldehyde is prohibited or undesirable. That is, the self-adhesive layer and the self-adhesive laminate of the present invention can be suitably used for architectural interior decoration materials, stationery, toy materials and the like.
- Tg Glass Transition Temperature (Tg) of Acrylate Ester Copolymer Resin
- the glass transition temperature (Tg) of the acrylate copolymer resin used as a material for the self-adhesive laminate described later was measured by the following method.
- the acrylic acid ester copolymer resin-containing aqueous dispersion was coated on a 50 ⁇ m thick polyethylene terephthalate film with a 250 ⁇ m applicator and dried at room temperature for 24 hours to obtain a resin film. Using this film as a sample, in accordance with JIS K 7121, a measurement temperature of ⁇ 50 ° C.
- the gel fraction of the acrylate copolymer resin-containing aqueous dispersion used as a material for the self-adhesive laminate described later was measured by the following method.
- the acrylic ester copolymer resin was applied onto a 50 ⁇ m thick polyethylene terephthalate film with a 200 ⁇ m applicator and dried at room temperature for 24 hours to obtain a resin film.
- a predetermined amount (X) (about 500 mg) was precisely weighed and immersed in 100 ml of ethyl acetate at room temperature for 3 days, and then the insoluble matter was filtered through an 80-mesh wire mesh for 15 hours at room temperature.
- a self-adhesive laminate was prepared as described later, and a test piece cut into a size of 200 mm ⁇ 200 mm was prepared after a separator film was attached to the surface of the self-adhesive layer.
- the specimen was placed in a 5 L Tedlar bag and sealed. 2L of air was sealed in it, left in a thermostat set at 23 ° C and 50% RH for 6 hours, and then the formaldehyde concentration in the bag was measured with a detector tube (Gastech, No. 91L). did.
- the results are shown in Table 3.
- Table 1 shows a summary of the composition of the resin composition Z1.
- This resin composition Z1 was stirred with a whisk, so that the foaming ratio was doubled, and the stirring speed was further reduced and stirring was continued for 5 minutes.
- the obtained foam was applied on a substrate (polyethylene terephthalate film having a thickness of 50 ⁇ m) using a 0.3 mm applicator. This was put in a drying oven and held at 1.3 ° C. for 1.33 minutes at 80 ° C., 1.33 minutes at 120 ° C., and 1.33 minutes at 140 ° C., and then subjected to dry crosslinking to form a 180 ⁇ m self-adhesive layer on the substrate A laminated self-adhesive laminate according to Example 1 was obtained.
- an acrylic ester copolymer resin (II) composition: ethyl acrylate 45 / butyl acrylate 46 / acrylonitrile 10 / N-methylol acrylamide 1.8 copolymer resin, glass transition temperature: ⁇ 14. 5 ° C., gel fraction: 51.8%) containing water dispersion (solid content concentration 55%) 100 parts, carbodiimide-based crosslinking agent (Nisshinbo Chemical Co., Ltd.
- the foam stabilizer [alkylbetaine amphoteric compound / fatty acid alkanolamide mixture (DIC, DICNAL M-20: solid content concentration 40%) / sulfonic acid type anionic surfactant (manufactured by DIC, DINCAL M-40: 1/1 mixture of solid content 35%]] 6 parts, ammonia aqueous solution (manufactured by Omori Chemical Co., Ltd .: concentration 28%) 0.6 parts, and finally thickener (carboxylic acid-modified acrylic ester) About 4.5 parts of polymer (Aron B-300K manufactured by Toagosei Co., Ltd., solid content concentration: 44%) was added to adjust the viscosity to 5000 mPa ⁇ s to obtain a resin composition Z2.
- Table 1 shows a summary of the composition of the resin composition Z2.
- This resin composition Z2 was foamed with a foaming machine so that the foaming ratio was 1.6 times to obtain a foam.
- FIG. 2 shows a schematic view of a coating machine (coating head) used in the following, and an upper drying furnace (F1 to F6) and a crosslinking furnace (K1, K2) through which a foam applied on a substrate passes. .
- the obtained foam was coated on a substrate (a polyethylene terephthalate film having a thickness of 110 ⁇ m) with a coating machine so as to have a thickness of 180 ⁇ m, and the furnace temperature indicated by A in Table 2 at a line speed of 15 m / min.
- Example 3 Acrylate ester copolymer resin (III) (composition: ethyl acrylate 45 / butyl acrylate 46 / acrylonitrile 10 / N-methylol acrylamide 1.8 copolymer resin, glass transition temperature: ⁇ 14.9 ° C., gel (Fraction: 47.8%)
- the resin composition Z3 (100% of the composition is shown in Table 1) containing 100 parts of the aqueous dispersion (solid content concentration 55%) was used.
- a self-adhesive laminate according to Example 3 was obtained.
- Example 4 In the same manner as in Example 3, except that the furnace temperature pattern indicated by B in Table 2 was changed to a thickness of 100 ⁇ m after film formation on a base material (polyethylene terephthalate film having a thickness of 80 ⁇ m). A self-adhesive laminate according to Example 4 was obtained in which a self-adhesive layer of 100 ⁇ m was laminated.
- an acrylic ester copolymer resin (IV) composition: ethyl acrylate 48 / butyl acrylate 47 / acrylonitrile 6 / N-methylol acrylamide 1.4 copolymer resin, glass transition temperature: ⁇ 25.
- the foam stabilizer [alkylbetaine amphoteric compound / fatty acid alkanolamide mixture (DIC, DICNAL M-20) / sulfonic acid type anionic surfactant (DIC, DICNAL M-40) 1/1 mixture] 6 parts, ammonia aqueous solution (manufactured by Daisoh Kako Co., Ltd .: concentration 28%), and finally a thickener (carboxylic acid-modified acrylic ester polymer. Aron B-300K, manufactured by Toagosei Co., Ltd.) About 44 parts by weight (solid content concentration: 44%) was added to adjust the viscosity to 5000 mPa ⁇ s to obtain a resin composition Z4.
- Table 1 shows a summary of the composition of the resin composition Z4.
- This resin composition Z4 was foamed with a foaming machine so that the expansion ratio was doubled to obtain a foam.
- the obtained foam was applied on a substrate (a polyethylene terephthalate film having a thickness of 110 ⁇ m) with the above-mentioned coating machine so as to have a thickness of 180 ⁇ m, and the inside of the furnace indicated by C in Table 2 at a line speed of 15 m / min.
- the furnace flowed in a temperature pattern.
- stacked 180 micrometers of self-adhesive layers on the base material was obtained.
- Comparative Example 2 In the same manner as in Comparative Example 1, except that the temperature pattern in the furnace indicated by D in Table 2 was changed to a thickness of 100 ⁇ m after film formation on a base material (polyethylene terephthalate film having a thickness of 80 ⁇ m). The self-adhesive laminated body which concerns on the comparative example 2 which laminated
- the sheets according to Examples 1 to 4 having a glossiness within the range of the present invention had good air release properties, and generated less formaldehyde.
- the sheets according to Comparative Examples 1 and 2 had good air bleeding due to the glossiness being within the range of the present invention, but generated a large amount of formaldehyde.
- the sheet according to Comparative Example 3 had a small amount of formaldehyde generated, but was inferior in air bleedability due to low glossiness.
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Abstract
Description
本発明の自己粘着性層にセパレーターフィルムを貼り付けた後、200mm×200mmのサイズに切り出した試験片を用意する。試験片を容積5Lのテドラーバッグに入れ、密閉する。その中に2Lの空気を封入し、23℃,50%RHに設定した恒温槽内で6時間放置した後、検知管(ガステック社製、No.91L)にてバッグ内のホルムアルデヒド濃度(ppm)を測定する。
本発明の自己粘着性層は、樹脂、並びに、架橋剤及び/又は開始剤を含む樹脂組成物の反応体からなる自己粘着性層であって、光沢度が33以上90以下であり、ホルムアルデヒド発生量が2ppm以下である。
本発明の自己粘着性層の光沢度は、33以上90以下であり、37以上90以下であることが好ましく、45以上90以下であることがより好ましい。光沢度が上記範囲内にあることにより、エア抜け性に優れたものとすることができる。
本発明に用いる樹脂は、本発明の自己粘着性層の光沢度及びホルムアルデヒド発生量を上記適切な範囲内とすることができるものであれば特に限定されないが、(メタ)アクリル酸エステル共重合体樹脂、ポリウレタン樹脂、ポリエステル樹脂、スチレン系樹脂、UV/EB硬化性樹脂、オレフィン系樹脂、脂環族飽和炭化水素樹脂等が挙げられ、中でも各種機械的強度や耐候性が優れる観点から、(メタ)アクリル酸エステル共重合体樹脂が好ましい。
本発明に用いることができる(メタ)アクリル酸エステル共重合体樹脂のガラス転移温度は-10℃以下であることが好ましく、-13℃以下であることがより好ましい。(メタ)アクリル酸エステル共重合体樹脂のガラス転移温度を上記上限値以下とすることによって、後述する(メタ)アクリル酸エステル共重合体樹脂のゲル分率を所定の上限値以下とし易くなり、結果として適切な自着力を有し、且つ、平滑性に優れた自己粘着性層及び自己粘着性積層体を作製し易くなる。特に下限はないが-40℃以上であることが好ましい。これ以下になると、粘着性が増し、自着力が増し、層強度が弱くなる。なお、本発明において、「自着力」とは、自己粘着性層と被着体との剥離強度のことであり、「層強度」とは、自己粘着性層自身の破壊強度のことである。
本発明において、(メタ)アクリル酸エステル共重合体樹脂は、N-メチロール基を有することが好ましい。かかる形態において、(メタ)アクリル酸エステル共重合体樹脂が有するN-メチロール基は、(メタ)アクリル酸エステル単量体と共重合可能な単量体単位に含まれることが好ましいが、(メタ)アクリル酸エステル単量体単位に含まれていてもよい。
なお、(メタ)アクリル酸エステル共重合体樹脂のガラス転移温度を-10℃以下に調整可能であれば、アクリル酸メチル(単独重合体のガラス転移温度は、10℃)、メタクリル酸メチル(同105℃)、メタクリル酸エチル(同63℃)、メタクリル酸n-プロピル(同25℃)、メタクリル酸n-ブチル(同20℃)などを用いてもよい。
ここでいう官能基としては、有機酸基、水酸基、アミノ基、アミド基、メルカプト基、エポキシ基等を挙げることができる。
(メタ)アクリル酸エステル共重合体樹脂の性状は、固体状であっても分散体状であってもよいが、乳化重合や分散重合でエマルション又はディスパージョンとして得たものをそのまま使用すると、架橋剤や導電性化合物と混合する上で操作が容易であり、また、得られたエマルション又はディスパージョンを発泡させるにも都合がよい。
本発明におけるゲル分率とは、(メタ)アクリル酸エステル共重合体樹脂のサンプル500mgを酢酸エチル100ml中に常温で3日間浸漬した後、不溶解分を80メッシュの金網で濾過し、15時間常温下で風乾し、その後100℃で2時間乾燥させ、不溶解分の乾燥質量を測定し、次式により求められる値である。
ゲル分率(質量%)=((酢酸エチル浸漬後の不溶解分の乾燥質量)/(酢酸エチル浸漬前のサンプル質量))×100
本発明に用いる架橋剤又は開始剤は、本発明の自己粘着性層の光沢度及びホルムアルデヒド発生量を上記適切な範囲内とすることができるものであれば、特に限定されず、使用する樹脂や架橋方法に応じて適宜選択することができる。例えば、カルボジイミド系架橋剤;ポリエチレングリコールジグリシジルエーテル、グリセリンポリグリシジルエーテル、ソルビトールポリグリシジルエーテル、ビスフェノールAポリグリシジルエーテル等のエポキシ樹脂;アルデヒドやアクロレイン等のエチレンイミン誘導体等のアジリジン系化合物;トリレンジイソシアネート、トリメチロールプロパントリレンジイソシアネート、ジフェニルメタントリイソシアネート等の多官能性イソシアネート系架橋剤;オキサゾリン系架橋剤;金属塩系架橋剤;金属キレート系架橋剤;過酸化物系架橋剤;ベンゾフェノン系、アセトフェノン系、チオキサントン系、スルホニウム系、ヨードニウム系等の光開始剤等が挙げられる。これらは、一種を単独で使用してもよく、二種以上を併用してもよい。なお、メラミン-ホルムアルデヒド樹脂、尿素-ホルムアルデヒド樹脂、フェノールホルムアルデヒド樹脂等のホルムアルデヒドを発生する原因となる架橋剤は使用しないことが好ましい。
中でも、上記樹脂としてN-メチロール基を有する(メタ)アクリル酸エステル共重合体樹脂を用いる場合には、優れた強度を発現させるとともに、使用時のホルムアルデヒドの発生量を低減させる観点から、カルボジイミド系架橋剤を用いることが好ましい。
本発明に用いることができるカルボジイミド系架橋剤は、特に限定されないが、2以上のカルボジイミド基を一分子内に有する化合物が好ましく用いられる。このような化合物としては、公知のカルボジイミド化合物を用いることができる。
従来、強度を高める目的で、N-メチロール基を有する(メタ)アクリル酸エステル共重合体樹脂とメラミン系架橋剤とを併用することが多かった。しかしながら、N-メチロール基を有するアクリル酸エステル共重合とメラミン系架橋剤とを併用する場合、架橋反応時に多量のホルムアルデヒドが発生し、自己粘着性層にも残留するため、自己粘着性層の使用時に、ホルムアルデヒドが発生する原因となっていた。カルボジイミド系架橋剤を用いることにより、N-メチロール基を有する(メタ)アクリル酸エステル共重合体樹脂を用いる場合でも、優れた強度を発現させるとともに、使用時のホルムアルデヒドの発生量を極めて少なくすることが可能である。
樹脂組成物は、さらにホルムアルデヒド捕捉剤を含有していてもよい。
本発明で使用し得るホルムアルデヒド捕捉剤は、ホルムアルデヒドを物理的に吸着し又はホルムアルデヒドと化学的に反応し得る化合物であれば特に限定されず、無機化合物であっても、重合体をも含む有機化合物であってもよい。
ホルムアルデヒド捕捉剤の具体例としては、硫酸ヒドロキシルアミン、塩酸ヒドロキシルアミン、酢酸アンモニウム、尿素、エチレン尿素、ジシアンジアミド、ポリアミド樹脂、トリアジン化合物、ヒドラジド化合物等の含窒素化合物;安定化二酸化塩素等のハロゲン酸化物;リン酸水素二ナトリウム、硫酸亜鉛、塩化カルシウム、硫酸マグネシウム等の金属塩;等が挙げられる。これらのうち、入手容易性、取扱い性及びホルムアルヒド捕捉性の観点から、含窒素化合物が好ましく、硫酸ヒドロキシルアミンが特に好ましい。
これらのホルムアルデヒド捕捉剤は1種類を単独で使用し、又は2種類以上を併用することができる。
添加剤の例としては、整泡剤、発泡助剤、増粘剤、充填材、防腐剤、防かび剤、ゲル化剤、難燃剤、老化防止剤、酸化防止剤、粘着付与剤、光増感剤、導電性化合物等を挙げることができる。
本発明において、樹脂組成物は発泡体であることが好ましい。樹脂組成物が発泡体であることにより、樹脂組成物の架橋体が発泡構造を有し、該架橋体からなる自己粘着性層が微細な空孔を利用した吸盤効果による吸着性を示すことができる。樹脂組成物を発泡させる方法については、後述する製造方法の発泡工程S12において詳述する。吸着により接着する自己粘着性層は、糊粘着のみにより接着する自己粘着性層よりも剥離性に優れ、糊残りが発生し難い。また、発泡セルが連通しているため、エア抜け性が良好でだれでもきれいに貼付できる。
本発明の自己粘着性積層体は、本発明の自己粘着性層と、基材からなる支持体層と、を有するものである。
ここで、紙基材としては、例えば上質紙、アート紙、コート紙、クラフト紙、カートン紙、これらの紙基材にポリエチレン等の熱可塑性樹脂をラミネートしたラミネート紙等が挙げられる。
一方、プラスチックシートとしては、例えば、ポリエチレンテレフタレート、ポリエチレンナフタレート等のポリエステル系樹脂、ポリスチレン系樹脂、ポリ塩化ビニル系樹脂、アクリル系樹脂、ポリカーボネート系樹脂、ポリアミド系樹脂、ポリテトラフルオロエチレン等のフッ素系樹脂、ポリエチレン、ポリプロピレン等のポリオレフィン系樹脂、ポリシクロオレフィン系樹脂、ポリビニルアルコール系樹脂、ポリ(エチレン―ビニルアルコール共重合)系樹脂、及びこれらの樹脂の混合物又は積層物からなるシートを用いることができる。
基材からなる支持体層の厚さは、特に限定されないが、通常、10μm~200μmである。
基材として、剥離性を有するものを用いれば、後述するようにして基材上に自己粘着性層を形成後、基材を剥離して、自己粘着性層として使用することができる。
以下、自己粘着性層及び自己粘着性積層体の製造方法について説明する。図1は、本発明の自己粘着性層の製造方法S10(以下、「本製造方法S10」と略記することがある。)を説明するフローチャートである。図1に示すように本製造方法S10は、樹脂組成物作製工程S1と、成形工程S2と、硬化工程S3とをこの順に有し、樹脂組成物作製工程S1と成形工程S2との間に発泡工程S12を有することが好ましい。以下、各工程について説明する。
樹脂組成物作製工程S1は、樹脂と架橋剤及び/又は開始剤とを含む樹脂組成物を作製する工程である。
バッチ式混合機としては、擂潰機、ニーダー、インターナルミキサー、プラネタリーミキサー等の高粘度原料用混練機や攪拌機が挙げられる。連続式混合機としては、ローターとスクリューを組み合わせたファレル型連続混練機等やスクリュー式の特殊な構造の混練機が挙げられる。また、押出し加工に使用されている単軸押出機や二軸押出機が挙げられる。これらの押出機や混練機は、二種類以上組み合わせてもよいし、同型の機械を複数連結して使用してもよい。
エマルション又はディスパージョンの粘度は、2,000~10,000mPa・sとするのが好ましく、3,500~5,500mPa・sとするのがより好ましい。
成形工程S2は、樹脂組成物を層状に成形する工程である。
硬化工程S3は、層状に成形された樹脂組成物中において硬化反応を行う工程である。
上述した通り、樹脂組成物作製工程S1と成形工程S2との間に、発泡工程S12を有することが好ましい。発泡工程S12を有することにより、発泡構造を有し、微細な空孔を利用した吸盤効果による吸着性を示す自己粘着性層を製造することができる。
発泡工程S12は、樹脂組成物を発泡させ、樹脂組成物の発泡体を得る工程である。
なお、上記機械発泡の代わりに、例えば塩化ビニリデン共重合体等の適当な合成樹脂を殻壁とし、低沸点炭化水素系化合物を内包する熱膨張性マイクロカプセルを、アクリル樹脂エマルジョンやブタジエン系合成ゴムエマルジョンに添加する方法等により、発泡体を調製することもできる。
本発明の自己粘着性積層体は、その基材面に、たとえば、オフセット印刷、シール印刷、フレキソ印刷、シルクスクリーン印刷、グラビア印刷、レーザープリンター、熱転写プリンター、インクジェットプリンター等による印刷を施すことができる。
基材面に印刷を施した自己粘着性積層体は、建築用装飾材料、広告宣伝用貼付材料、文具又は玩具用材料としての使用が可能である。例えば、販売促進カード、いわゆるPOPカード(ポスター、ステッカー、ディスプレイ等)、下敷き(ランチマット、テーブルマット、文房具用等)、ハンバーガー、寿司、焼ソバ等のファースト・フード店のメニュー、カタログ、パネル、プレート(金属板の代替え)、ブロマイド、店頭価格表、案内板(売り場案内、方向・行き先案内、お菓子・食品等)、園芸用POP(差しラベル等)、ロード・サイン(葬式・住宅展示場所等)、表示板(立ち入り禁止、林道作業等の)、カレンダー(画像入り)、簡易ホワイトボード、マウスパッド、コースター、ラベルライターの代替え印刷物、粘着ラベル等として利用することが可能である。
また、本発明の自己粘着性層及び自己粘着性積層体は、各種光学部品、精密部品等を対象とする物品表面保護材料や物品保持材料として好適に使用できる。
また、何回でも貼って、剥がすことができるので、様々な箱、袋等の基材に自己粘着性層を形成することによって、開口部を閉じる際の仮止めやシール材としても使用できる。特に、食品や嗜好品や日用品等の細かいカスが外に散らばり易いものの開口後の一時仮止めとして、カスが自己粘着性層に付着し難いので好適である。更に、自己粘着性層は箱や袋等の容器内の気密性を増すことができるため、傷みやすい食品や嗜好品の容器を一度開けた後でも再度自己粘着性層を介して閉じることによって、フレッシュな状態を保ち、酸素や水分等による傷みから内容物を防ぐことができる。
したがって、上記のように、開閉を繰り返すことがある用途や、内容物をフレッシュな状態に保つ必要がある用途として、例えば、菓子、コーヒー、茶、たばこ、洗剤等のパッケージに使用することができる。
<アクリル酸エステル共重合体樹脂のガラス転移温度(Tg)の測定>
後述する自己粘着性積層体の材料として用いるアクリル酸エステル共重合体樹脂のガラス転移温度(Tg)を、以下の方法で測定した。アクリル酸エステル共重合体樹脂含有水分散体を厚み50μmのポリエチレンテレフタレートフィルム上に250μmのアプリケーターで塗布し、常温下で24時間乾燥させて、樹脂フィルムを得た。このフィルムをサンプルとして、JIS K 7121に準じて、測定温度-50℃~160℃、昇温速度10℃/分、示差走査熱量分析計(SIIナノテクノロジー社製、DSC6220)を用いて熱流束示差走査熱量測定(熱流束DSC)を行い、ガラス転移温度(℃)(中間点ガラス転移温度(Tmg))を測定した。
後述する自己粘着性積層体の材料として用いるアクリル酸エステル共重合体樹脂含有水分散体のゲル分率を、以下の方法で測定した。アクリル酸エステル共重合体樹脂を厚み50μmのポリエチレンテレフタレートフィルム上に200μmのアプリケーターで塗布し、常温下で24時間乾燥させて、樹脂フィルムを得た。このフィルムをサンプルとして、所定量(X)(約500mg)を精秤し、これを酢酸エチル100ml中に常温で3日間浸漬した後、不溶解分を80メッシュの金網で濾過し、15時間常温下で風乾し、その後100℃で2時間乾燥させ、常温下で冷却した後に試料の質量(Y)を測定した。X及びYを次式に代入することにより、ゲル分率を算出した。
ゲル分率(%)=(Y)/(X)×100
<光沢度(60°グロス)>
後に説明するようにして作製した自己粘着性積層体の自己粘着性層表面の光沢度を、JIS Z 8741に準じて、光沢度計(東京電色社製、GP-60A)を用いて測定した。結果を表3に示す。この評価による結果が33以上であれば、シート表面の平滑性に優れると言える。
後に説明するようにして自己粘着性積層体を作製し、さらに、自己粘着性層表面にセパレーターフィルムを貼り付けた後、200mm×200mmのサイズに切り出した試験片を用意した。試験片を容積5Lのテドラーバッグに入れ、密閉した。その中に2Lの空気を封入し、23℃、50%RHに設定した恒温槽内で6時間放置した後、検知管(ガステック社製、No.91L)にてバッグ内のホルムアルデヒド濃度を測定した。その結果を表3に示す。なお、ホルムアルデヒド濃度が本測定方法の検出限界である0.1ppmを下回り、ホルムアルデヒドが検出されなかった場合を「<0.1」で示した。本測定結果が2ppm以下であれば、ホルムアルデヒドの発生量が少ないと言える。
後に説明するようにして自己粘着性積層体を作製後、100mm×100mmの正方形にカットし、自己粘着性層側の面が接するようにガラス板に載せ、支持体層側の面から荷重0.5gfのローラーを1往復させてガラス板に貼りつけた。このとき、下記により算出される面積が10mm2以上となるエア溜まりが存在するか否かで評価した。下記により算出される面積が10mm2以上となるエア溜まりが存在しない場合を「○」、存在する場合を「×」として、その結果を表3に示した。この評価が「○」であれば、噛み込まれるエアが少なく、エア抜け性に優れていると言える。
エア溜まりの面積の算出は、最も大きなエア溜まりを囲むことができる最も面積の小さい長方形を作図し、その長方形の面積を測定することにより算出した。
(実施例1)
混合容器に、アクリル酸エステル共重合体樹脂(I)(組成:アクリル酸エチル45/アクリル酸ブチル46/アクリロニトリル10/N-メチロールアクリルアミド1.8、ガラス転移温度:-15.3℃、ゲル分率:41.5%)含有水分散体(固形分濃度55%)100部と、カルボジイミド系架橋剤(DIC社製、DICNAL HX:固形分濃度40%)5部、酸化チタン水分散体(DIC社製、DISPERSE WHITE HG-701:固形分濃度66%)3.5部を添加し、ディスパーで撹拌した。次に撹拌を継続しながら、増粘剤(カルボン酸変性アクリル酸エステル重合体。東亞合成社製、アロンB-300K:固形分濃度44%)を5部、及び整泡剤〔アルキルベタイン両性化物・脂肪酸アルカノールアミド混合物(DIC社製、DICNAL M-20:固形分濃度40%)/スルホン酸型アニオン界面活性剤(DIC社製、DICNAL M-40:固形分濃度35%)の1/1混合物〕6部をこの順に添加し、最後にアンモニア水溶液(大盛化工社製:濃度28%)約0.6部を添加して粘度を4500mPa・sに調整して樹脂組成物Z1を得た。樹脂組成物Z1の組成をまとめたものを表1に示す。
この樹脂組成物Z1を泡立て器で撹拌し、発泡倍率が2倍になるように泡立て、更に撹拌速度を落として5分間撹拌を続行した。
得られた発泡体を基材(厚み50μmのポリエチレンテレフタレートフィルム)の上に、0.3mmのアプリケーターを用いて塗布した。これを乾燥炉に入れ、80℃で1.33分間、120℃で1.33分間、140℃で1.33分間保持して、乾燥架橋を行わせて基材上に自己粘着性層180μmを積層した実施例1に係る自己粘着性積層体を得た。
混合容器に、アクリル酸エステル共重合体樹脂(II)(組成:アクリル酸エチル45/アクリル酸ブチル46/アクリロニトリル10/N-メチロールアクリルアミド1.8の共重合体樹脂、ガラス転移温度:-14.5℃、ゲル分率:51.8%)含有水分散体(固形分濃度55%)100部と、カルボジイミド系架橋剤(日清紡ケミカル社製、カルボジライト(登録商標)E-02:固形分濃度40%)3部、酸化チタン水分散体(DIC社製、DISPERSE WHITE HG-701:固形分濃度66%)3.5部を添加し、ディスパーで撹拌した。次に撹拌を継続しながら、整泡剤〔アルキルベタイン両性化物・脂肪酸アルカノールアミド混合物(DIC社製、DICNAL M-20:固形分濃度40%)/スルホン酸型アニオン界面活性剤(DIC社製、DICNAL M-40:固形分濃度35%)の1/1混合物〕6部、アンモニア水溶液(大盛化工社製:濃度28%)0.6部、最後に増粘剤(カルボン酸変性アクリル酸エステル重合体。東亞合成社製、アロンB-300K:固形分濃度44%)を約4.5部添加して粘度を5000mPa・sに調整して樹脂組成物Z2を得た。樹脂組成物Z2の組成をまとめたものを表1に示す。
この樹脂組成物Z2を発泡機で発泡倍率が1.6倍になるように発泡し、発泡体を得た
。
図2に、以下で用いる塗工機(コーティングヘッド)、及び、基材上に塗布された発泡体が通過する上部乾燥炉(F1~F6)及び架橋炉(K1、K2)の概略図を示す。
得られた発泡体を塗工機で基材(厚み110μmのポリエチレンテレフタレートフィルム)上に成膜後180μm厚になるように塗布し、ラインスピード15m/minで、表2にAで示す炉内温度パターン(乾燥炉F1:60℃、乾燥炉F2:80℃、乾燥炉F3:100℃、乾燥炉F4:130℃、乾燥炉F5:135℃、乾燥炉F6:140℃、架橋炉K1:140℃、架橋炉K2:140℃)で炉内を流し、基材上に自己粘着性層180μmを積層した実施例2に係る自己粘着性積層体を得た。
アクリル酸エステル共重合体樹脂(III)(組成:アクリル酸エチル45/アクリル酸ブチル46/アクリロニトリル10/N-メチロールアクリルアミド1.8の共重合体樹脂、ガラス転移温度:-14.9℃、ゲル分率:47.8%)含有水分散体(固形分濃度55%)を100部含む樹脂組成物Z3(組成をまとめたものを表1に示す。)を使用した以外は実施例2と同様にして、実施例3に係る自己粘着性積層体を得た。
表2にBで示す炉内温度パターンに変更し、基材(厚み80μmのポリエチレンテレフタレートフィルム)上に成膜後100μm厚になるように塗布した以外は実施例3と同様にして、基材上に自己粘着性層100μmを積層した実施例4に係る自己粘着性積層体を得た。
混合容器に、アクリル酸エステル共重合体樹脂(IV)(組成:アクリル酸エチル48/アクリル酸ブチル47/アクリロニトリル6/N-メチロールアクリルアミド1.4の共重合体樹脂、ガラス転移温度:-25.9℃、ゲル分率:43.1%)含有水分散体(固形分濃度55%)100部と、メラミン系架橋剤(DIC社製、BECKAMINE M-3:固形分濃度80%)5部、及び架橋促進剤(DIC社製、CATALYST ACX:固形分濃度35%)0.5部、酸化チタン水分散体(DIC社製、DISPERSE WHITE HG-701:固形分濃度66%)3.5部を添加し、ディスパーで撹拌した。次に撹拌を継続しながら、整泡剤〔アルキルベタイン両性化物・脂肪酸アルカノールアミド混合物(DIC社製、DICNAL M-20)/スルホン酸型アニオン界面活性剤(DIC社製、DICNAL M-40)の1/1混合物〕6部、アンモニア水溶液(大盛化工社製:濃度28%)0.6部、最後に増粘剤(カルボン酸変性アクリル酸エステル重合体。東亞合成社製、アロンB-300K:固形分濃度44%)を約4.5部添加して粘度を5000mPa・sに調整して樹脂組成物Z4を得た。樹脂組成物Z4の組成をまとめたものを表1に示す。
この樹脂組成物Z4を発泡機で発泡倍率が2倍になるように発泡し、発泡体を得た。
得られた発泡体を上記塗工機で基材(厚み110μmのポリエチレンテレフタレートフィルム)上に成膜後180μm厚になるように塗布し、ラインスピード15m/minで、表2にCで示す炉内温度パターンで炉内を流した。基材上に自己粘着性層180μmを積層した比較例1に係る自己粘着性積層体を得た。
表2にDで示す炉内温度パターンに変更し、基材(厚み80μmのポリエチレンテレフタレートフィルム)上に成膜後100μm厚になるように塗布した以外は比較例1と同様にして、基材上に自己粘着性層100μmを積層した比較例2に係る自己粘着性積層体を得た。
アクリル酸エステル共重合体樹脂(V)(組成:アクリル酸エチル45/アクリル酸ブチル45/アクリロニトリル8/イタコン酸2の共重合体樹脂、ガラス転移温度:-20.2℃、ゲル分率:89.6%)含有水分散体(固形分濃度55%)を100部含む樹脂組成物Z5(組成をまとめたものを表1に示す。)を使用した以外は実施例1と同様にして、比較例3に係る自己粘着性積層体を得た。
Claims (11)
- 樹脂、並びに、架橋剤及び/又は開始剤を含む樹脂組成物の反応体からなる自己粘着性層であって、
光沢度が33以上90以下であり、
ホルムアルデヒド発生量が2ppm以下である、自己粘着性層。 - 前記樹脂が(メタ)アクリル酸エステル共重合体樹脂である、請求項1に記載の自己粘着性層。
- 前記(メタ)アクリル酸エステル共重合体樹脂のガラス転移温度が-10℃以下である、請求項2に記載の自己粘着性層。
- 前記(メタ)アクリル酸エステル共重合体樹脂がN-メチロール基を有し、且つ、ゲル分率が70%以下である、請求項2又は3に記載の自己粘着性層。
- 前記樹脂組成物が発泡体である、請求項1~4のいずれかに記載の自己粘着性層。
- 前記発泡体の発泡倍率が1.1倍以上4倍以下である、請求項5に記載の自己粘着性層。
- 前記架橋剤がカルボジイミド系架橋剤である、請求項1~6のいずれかに記載の自己粘着性層。
- 前記樹脂組成物が、(メタ)アクリル酸エステル共重合体樹脂100質量部と、カルボジイミド系架橋剤0.1~20質量部と、を含む、請求項1~7のいずれかに記載の自己粘着性層。
- 厚みが0.005mm以上0.5mm以下である、請求項1~8のいずれかに記載の自己粘着性層。
- 請求項1~9のいずれかに記載の自己粘着性層と、基材からなる支持体層と、を有する自己粘着性積層体。
- 前記基材がプラスチックシート又は紙基材である、請求項10に記載の自己粘着性積層体。
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CN109072020A (zh) | 2018-12-21 |
KR20190003486A (ko) | 2019-01-09 |
BR112018070458A2 (pt) | 2019-02-05 |
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