WO2016002391A1 - 反応性ホットメルト接着剤組成物 - Google Patents
反応性ホットメルト接着剤組成物 Download PDFInfo
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- WO2016002391A1 WO2016002391A1 PCT/JP2015/065080 JP2015065080W WO2016002391A1 WO 2016002391 A1 WO2016002391 A1 WO 2016002391A1 JP 2015065080 W JP2015065080 W JP 2015065080W WO 2016002391 A1 WO2016002391 A1 WO 2016002391A1
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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
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/08—Polyurethanes from polyethers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
- C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
- C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
- C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
- C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
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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
- C08L101/00—Compositions of unspecified macromolecular compounds
- C08L101/02—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
- C08L101/025—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing nitrogen atoms
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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
- C08L101/00—Compositions of unspecified macromolecular compounds
- C08L101/02—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
- C08L101/06—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing oxygen atoms
- C08L101/08—Carboxyl groups
-
- 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
- C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
- C08L33/10—Homopolymers or copolymers of methacrylic acid esters
- C08L33/12—Homopolymers or copolymers of methyl methacrylate
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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
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
-
- 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
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
-
- 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
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/06—Polyurethanes from polyesters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2170/00—Compositions for adhesives
- C08G2170/20—Compositions for hot melt adhesives
Definitions
- the present invention relates to a reactive hot melt adhesive composition.
- a polystyrene macromer having a vinyl group at the molecular end an alkyl acrylate having an alkyl group having 1 to 12 carbon atoms, and an alkyl methacrylate having an alkyl group having 1 to 12 carbon atoms.
- Reactive hot melt adhesive composition comprising a graft polymer (A), a polyol (B) and a polyisocyanate (C) obtained by copolymerizing one or more monomers selected from the group The thing is proposed and it is described that the said composition can mix
- an object of this invention is to provide the reactive hot-melt-adhesive composition which is excellent in water-resistant adhesiveness.
- the present inventor contains a urethane prepolymer having an isocyanate group, a (meth) acrylic resin, and a liquid polymer having a (meth) acryloyloxy group and / or an isocyanate group.
- the present invention was completed by finding that the composition can be a moisture-curable reactive hot-melt adhesive having excellent adhesiveness (particularly excellent in hot water-resistant adhesiveness). That is, the present inventors have found that the above problem can be solved by the following configuration.
- a urethane prepolymer having an isocyanate group (Meth) acrylic resin, A moisture-curable reactive hot-melt adhesive composition containing a liquid polymer having a (meth) acryloyloxy group and / or an isocyanate group.
- the amount of the liquid polymer is 1 to 5 parts by mass with respect to a total of 100 parts by mass of the polyol and polyisocyanate used in the production of the (meth) acrylic resin and the urethane prepolymer.
- the urethane prepolymer is a compound produced by reacting a bifunctional polyol and / or a trifunctional polyol with a polyisocyanate,
- the reactive hot melt adhesive composition of the present invention is excellent in water-resistant adhesion.
- the reactive hot melt adhesive composition of the present invention (the composition of the present invention) A urethane prepolymer having an isocyanate group; (Meth) acrylic resin, A moisture-curable reactive hot-melt adhesive composition containing a liquid polymer having a (meth) acryloyloxy group and / or an isocyanate group.
- the composition of the present invention contains a liquid polymer having a (meth) acryloyloxy group and / or an isocyanate group as an adhesion-imparting agent, so that the liquid polymer does not have a (meth) acryloyloxy group and / or an isocyanate group. It is more excellent in adhesiveness than a composition containing.
- the main chain portion of the liquid polymer has good affinity with the substrate (particularly olefin), and further has a (meth) acryloyloxy group and / or an isocyanate group, so that the urethane prepolymer and / or It is considered that compatibility with the (meth) acrylic resin is increased, and thereby excellent adhesiveness (particularly water-resistant adhesiveness) can be expressed.
- the urethane prepolymer contained in the composition of the present invention has an isocyanate group.
- One preferred embodiment of the urethane prepolymer is a urethane prepolymer containing a plurality of isocyanate groups in one molecule at the molecular end.
- a conventionally well-known thing can be used as a urethane prepolymer.
- a polyisocyanate and a compound having two or more active hydrogen-containing groups in one molecule hereinafter abbreviated as “active hydrogen compound” are used so that the isocyanate groups are excessive with respect to the active hydrogen-containing groups.
- active hydrogen compound a compound having two or more active hydrogen-containing groups in one molecule
- the reaction product obtained by making it react can be used.
- the active hydrogen-containing group means a group containing active hydrogen. Examples of the active hydrogen-containing group include a hydroxy group, an amino group, and an imino group.
- the polyisocyanate used in the production of the urethane prepolymer is not particularly limited as long as it has two or more isocyanate groups in the molecule.
- the polyisocyanate include tolylene diisocyanate (TDI, for example, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate), diphenylmethane diisocyanate (MDI, for example, 4,4′-diphenylmethane diisocyanate, 2,4 '-Diphenylmethane diisocyanate), 1,4-phenylene diisocyanate, polymethylene polyphenylene polyisocyanate, xylylene diisocyanate (XDI), tetramethylxylylene diisocyanate (TMXDI), tolidine diisocyanate (TODI), 1,5-naphthalene diisocyanate (NDI) , Aromatic polyisocyanates such as triphen
- the polyisocyanate is preferably an aromatic polyisocyanate and more preferably MDI because of its excellent curability.
- Polyisocyanate can be used individually or in combination of 2 or more types, respectively.
- the compound (active hydrogen compound) which has two or more active hydrogen containing groups in 1 molecule used in the case of manufacture of a urethane prepolymer is not specifically limited.
- the active hydrogen-containing group include a hydroxyl group (OH group), an amino group, and an imino group.
- the active hydrogen compound include a polyol having two or more hydroxyl groups in one molecule, a polyamine compound having two or more amino groups and / or imino groups in one molecule, A polyol is preferred.
- the active hydrogen compounds can be used alone or in combination of two or more.
- polystyrene resin examples include polyether polyols; castor oil-based polyols; polyester polyols; polymer polyols having a carbon-carbon bond in the main chain skeleton such as acrylic polyols, polybutadiene diols, and hydrogenated polybutadiene polyols; low molecular weight polyhydric alcohols
- polyether polyols and castor oil-based polyols are mentioned as one of preferred embodiments.
- the polyether polyol is not particularly limited as long as it is a compound having polyether as a main chain and having two or more hydroxy groups.
- the polyether is a group having two or more ether bonds. Specific examples thereof include a group having two or more structural units —R a —O—R b — in total.
- R a and R b each independently represent a hydrocarbon group.
- the hydrocarbon group is not particularly limited. For example, a linear alkylene group having 1 to 10 carbon atoms can be mentioned.
- polyether polyol examples include polyoxyethylene diol (polyethylene glycol), polyoxypropylene diol (polypropylene glycol: PPG), polyoxypropylene triol, ethylene oxide / propylene oxide copolymer, polytetramethylene ether glycol (PTMEG). And polyoxyalkylene polyols such as polytetraethylene glycol; sorbitol-based polyols and the like.
- Castor oil-based polyol is not particularly limited.
- the polyol is preferably a bifunctional polyol (a compound having two hydroxyl groups in one molecule) and / or a trifunctional polyol (a compound having three hydroxyl groups in one molecule).
- the bifunctional polyol is preferably a polyoxyalkylene diol and / or a castor oil-based diol, and more preferably at least one selected from the group consisting of polyoxypropylene diol, polyoxyethylene diol and castor oil-based diol.
- the weight average molecular weight of the bifunctional polyol is preferably 5,000 or less, and more preferably 2,000 to 4,000.
- the weight average molecular weight of the polyol is a polystyrene equivalent value obtained by the GPC method (solvent: tetrahydrofuran (THF)).
- the amount of the bifunctional polyol is preferably 30 to 80 parts by mass in a total of 100 parts by mass of the polyol and polyisocyanate used in the production of the urethane prepolymer and the (meth) acrylic resin.
- the bifunctional polyol it is preferable to use castor oil-based polyol (particularly castor oil-based diol) for the reason of better adhesion to the substrate (particularly olefin resin).
- the amount of castor oil-based polyol is preferably 5 to 30% by mass based on the total amount of polyol used for the production of the urethane prepolymer.
- the trifunctional polyol is preferably polyoxyalkylene triol, more preferably polyoxyethylene triol or polyoxypropylene triol.
- the weight average molecular weight of the trifunctional polyol is preferably 3,000 or more, and more preferably 5,000 to 10,000 from the viewpoint of excellent viscosity, strength, and adhesiveness.
- the amount of the trifunctional polyol is preferably 5 to 50% by mass, and more preferably 5 to 45% by mass, based on the total amount of polyol used for the production of the urethane prepolymer.
- the method for producing the urethane prepolymer is not particularly limited.
- polyisocyanate is used so that 1.3 to 2.5 moles of isocyanate groups react with 1 mole of active hydrogen-containing groups (for example, hydroxy groups) of the active hydrogen compound, and these are mixed and reacted.
- active hydrogen-containing groups for example, hydroxy groups
- the urethane prepolymers can be used alone or in combination of two or more.
- the (meth) acrylic resin will be described below.
- the (meth) acrylic resin contained in the composition of the present invention is not particularly limited.
- the composition of this invention can express high adhesiveness in an initial stage by containing a (meth) acrylic resin.
- (meth) acryl means acryl or methacryl.
- (Meth) acrylic resin will not be restrict
- (meth) acrylic monomers include (meth) acrylate monomers, acid functional group-containing (meth) acrylic monomers, tertiary amine-containing (meth) acrylic monomers, hydroxy group-containing (meth) acrylic monomers, (Meth) acrylamide monomers may be mentioned.
- the ethylenically unsaturated bond-containing monomer other than (meth) acrylic monomers is not particularly limited. For example, styrene etc. are mentioned.
- the (meth) acrylic resin may be either a homopolymer or a copolymer.
- the (meth) acrylic resin is not particularly limited for its production. For example, a conventionally well-known thing is mentioned.
- the (meth) acrylic resins can be used alone or in combination of two or more.
- the amount of (meth) acrylic resin is preferably 20 to 50 parts by mass with respect to 100 parts by mass of the urethane prepolymer from the viewpoint of excellent initial strength.
- the liquid polymer contained in the composition of the present invention is a polymer that is liquid at room temperature and has a (meth) acryloyloxy group and / or an isocyanate group as a substituent.
- the liquid polymer contained in the composition of the present invention can function as an adhesion-imparting agent.
- the main chain of the liquid polymer is not particularly limited. Examples thereof include polyisoprene, polybutadiene, and hydrogenated products thereof.
- the liquid polymer preferably has 1 to 10 (meth) acryloyloxy groups and / or isocyanate groups in one molecule, and more preferably 2 to 5.
- the (meth) acryloyloxy group is CH 2 ⁇ CR—CO—O— (R is a hydrogen atom or a methyl group).
- the (meth) acryloyloxy group or the isocyanate group can be bonded to the main chain via a hydrocarbon group which may have a hetero atom such as an oxygen atom, a nitrogen atom or a sulfur atom, or directly. .
- the hydrocarbon group is not particularly limited.
- the hydrocarbon group may have 1 to 30 carbon atoms.
- Examples of the hydrocarbon group include an aliphatic hydrocarbon group having 1 to 30 carbon atoms, an alicyclic hydrocarbon group having 3 to 30 carbon atoms, an aromatic hydrocarbon group having 6 to 30 carbon atoms, and combinations thereof.
- the hydrocarbon group may be linear or branched and may have an unsaturated bond.
- the hydrocarbon group is exemplified as being monovalent or divalent or higher. The same applies to the following examples of various hydrocarbon groups.
- Examples of the aliphatic hydrocarbon group include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, an octyl group, a decyl group, and an eicosyl group.
- Examples of the alicyclic hydrocarbon group include a cyclopentyl group and a cyclohexyl group.
- Examples of the aromatic hydrocarbon group include a phenyl group, a naphthalene ring, and an anthracene ring.
- the hydrocarbon group has a hetero atom
- at least one of the carbon atoms in the hydrocarbon group is a hetero atom or a functional group having a hetero atom (for example, a divalent or higher functional group). May be substituted and / or at least one of the hydrogen atoms in the hydrocarbon group (in which case the number of carbon atoms is not limited) is substituted with a functional group containing a hetero atom (eg, a monovalent functional group). Also good.
- Examples of the functional group include monovalent functional groups such as hydroxy group, amino group, mercapto group, isocyanate group, and alkoxysilyl group; divalent groups such as carbonyl group, urethane bond, urea bond, allophanate bond, and ester bond.
- monovalent functional groups such as hydroxy group, amino group, mercapto group, isocyanate group, and alkoxysilyl group
- divalent groups such as carbonyl group, urethane bond, urea bond, allophanate bond, and ester bond.
- heteroatom can form, for example, an ether bond, a secondary amine, a tertiary amine, a sulfide bond.
- the liquid polymer is not particularly limited for its production.
- a raw material liquid polymer having a hydroxyl group and a polyisocyanate and / or a compound having an isocyanate group and a (meth) acryloyloxy group have an index (molar ratio of NCO / OH) of 0.8 to 1.2.
- Liquid polymers can be produced by mixing in amounts and reacting them in the presence of a tin catalyst at 60-80 ° C. under a nitrogen atmosphere.
- the raw material liquid polymer having a hydroxyl group is a liquid polymer having a hydroxyl group (OH group) at room temperature.
- Examples of the main chain include those similar to the liquid polymer contained in the composition of the present invention.
- the weight average molecular weight of the liquid polymer is preferably from 5,000 to 50,000, more preferably from 10,000 to 30,000, from the viewpoints of better water-resistant adhesion, better compatibility and workability.
- the weight average molecular weight of the liquid polymer is a standard polystyrene equivalent value by gel permeation chromatography (GPC) using THF as a solvent.
- the polyisocyanate used for the production of the liquid polymer is not particularly limited as long as it is a compound having two or more isocyanate groups in one molecule.
- the thing similar to the polyisocyanate which can be used in the case of manufacture of said urethane prepolymer is mentioned.
- Specific examples include aliphatic polyisocyanates. Of these, isophorone diisocyanate and hexamethylene diisocyanate are preferable.
- Examples of the compound having an isocyanate group and a (meth) acryloyloxy group used in the production of the liquid polymer include at least one isocyanate group and at least one (meth) acryloyloxy group in one molecule.
- the liquid polymers can be used alone or in combination of two or more.
- the amount of the liquid polymer is more excellent in water-resistant adhesion, and from the viewpoint of excellent workability, with respect to a total of 100 parts by mass of the polyol and polyisocyanate used in the production of the urethane prepolymer and (meth) acrylic resin.
- the content is preferably 1 to 5 parts by mass, more preferably 1.5 to 3.0 parts by mass.
- the liquid polymer is a polymer other than the urethane polymer having an isocyanate group described above.
- the composition of this invention can contain a reaction catalyst further from a viewpoint that it is excellent by water-resistant adhesiveness, and is excellent in sclerosis
- the reaction catalyst is not particularly limited as long as it promotes the reaction of isocyanate groups.
- An example is dimorpholinodiethyl ether.
- the reaction catalyst is preferably excellent in thermal stability.
- the amount of the reaction catalyst is not particularly limited. For example, it can be the same amount as conventionally known.
- the composition of the present invention is within a range that does not impair the purpose of the present invention, if necessary, for example, a liquid polymer other than the liquid polymer contained in the composition of the present invention, a filler (for example, carbon black, calcium carbonate).
- a filler for example, carbon black, calcium carbonate.
- Additives such as plasticizers, anti-aging agents, antioxidants, pigments, thixotropic agents, UV absorbers, flame retardants, surfactants, dispersants, dehydrating agents, antistatic agents and the like can be contained.
- the amount of the additive is not particularly limited. For example, it can be the same as conventionally known.
- the production method of the composition of the present invention is not particularly limited.
- the polyol and (meth) acrylic resin used in the production of the urethane prepolymer are stirred at 120 ° C. under reduced pressure, and the polyol and the (meta ) Dehydrating the mixture with the acrylic resin, and then adding the polyisocyanate used for the production of the urethane prepolymer to the mixture after the dehydration under the condition of 120 ° C.
- a mixture with a (meth) acrylic resin can be produced, and a liquid polymer, which can be added as necessary, can be added to the mixture, and a reaction catalyst and additives can be added and mixed to produce the composition of the present invention. .
- the composition of the present invention can be a one-component type or a two-component type.
- the composition of the present invention is used as a main agent (first liquid), and the set includes the main agent and a curing agent (curing agent in a broad sense; second liquid).
- the hardener in the broad sense (second liquid) includes a hardener (hardener in the narrow sense) as a curing component, and the hardener in the narrow sense is not particularly limited as long as it is a compound that can react with the urethane prepolymer. For example, a conventionally well-known thing is mentioned.
- Examples of the substrate to which the composition of the present invention can be applied include plastic, glass, rubber, metal and the like.
- plastics include olefin resins such as polypropylene and polyethylene, polyester resins such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), polymethyl methacrylate resin (PMMA resin), polycarbonate resin, polystyrene resin, acrylonitrile / styrene.
- Examples thereof include hard-to-adhere resins such as polymerization resin, polyvinyl chloride resin, acetate resin, ABS resin, and polyamide resin.
- the substrate may be surface treated.
- Examples of the surface treatment include frame treatment, corona treatment, and itro treatment. These processes are not particularly limited. For example, a conventionally well-known thing is mentioned.
- the composition of the present invention is a moisture curable reactive hot melt adhesive composition, and can be applied to a substrate by heating and melting the composition of the present invention.
- the temperature for heating the composition of the present invention is preferably 110 to 130 ° C.
- the application method to the substrate is not particularly limited. For example, a conventionally well-known thing is mentioned.
- the composition of the present invention is a moisture-curable reactive hot-melt adhesive composition, and can be cured by reacting with moisture.
- the composition of the present invention can be cured under conditions of 5 to 90 ° C. and a relative humidity of 5 to 95 (% RH).
- composition of the present invention can be used in a field where moisture-curing hot melt adhesives are conventionally used.
- moisture-curing hot melt adhesives are conventionally used.
- attachment of the interior material and exterior material for motor vehicles, etc. are mentioned.
- the polyisocyanate shown in the column of urethane prepolymer in Table 1 is added to the mixture after dehydration in the amount (part by mass) shown in the same table and allowed to react for 1 hour under normal pressure.
- the mixture was further stirred under reduced pressure for 1 hour to produce a mixture of urethane prepolymer and (meth) acrylic resin.
- the said urethane prepolymer has an isocyanate group at the terminal.
- composition For the mixture of urethane prepolymer produced as described above (the amount of urethane prepolymer is the total amount of each component in the column of urethane prepolymer in Table 1) and (meth) acrylic resin, The liquid polymer and reaction catalyst shown in Table 1 were added in the amounts (parts by mass) shown in the same table, and these were mixed with a stirrer to produce a composition.
- the melt viscosity of the composition was measured on 120 degreeC conditions using the Brookfield viscometer (Brooksfield company DV2T viscometer, No. 27 rotor, rotation speed 5.0rpm). Specifically, the composition is preheated to 120 ° C., and 11 g is weighed in a viscometer cup. Set in a viscometer and heat at 120 ° C. for 15 minutes, then set the rotor and heat for another 15 minutes. Thereafter, the measurement was started, and the value after 2 minutes was defined as the initial viscosity.
- Brookfield viscometer Brookfield company DV2T viscometer, No. 27 rotor, rotation speed 5.0rpm
- the composition produced as described above was melted at 120 ° C and applied to polypropylene (with plasma treatment) having a width of 2.5 cm and a length of 5 cm.
- the above polypropylene is pressure-bonded to a polycarbonate having a width of 2.5 cm and a length of 5 cm, and a lap surface (width 2.5 cm, length 1 cm; composition thickness on the wrap surface 5 mm) to produce a test piece. did.
- the test piece was cured for 1 hour under the conditions of 20 ° C. and 50% RH to obtain an initial sample.
- the initial shear strength (initial shear strength) of the initial sample was measured at a tensile speed of 50 mm / min and at 20 ° C.
- the heat resistance test which put the sample for normal tests obtained as mentioned above on the conditions of 120 degreeC for 7 days was done. Let the sample after a test be a sample for heat resistance evaluation. The shear strength was measured under the condition of 20 ° C. at a tensile speed of 50 mm / min using the above heat resistance evaluation sample. The shear strength after the heat resistance test (measured under the condition of 20 ° C.) was good if it was 70% or more of the normal shear strength (the shear strength after the above normal test (measured under the condition of 20 ° C.)).
- Liquid polymer 1 Liquid polyisoprene containing methacryloyloxy group, trade name UC-102, manufactured by Kuraray Co., Ltd. One molecule has two methacryloyloxy groups. Weight average molecular weight 19,000, liquid at normal temperature.
- Liquid polymer 2 Polyolefin having a hydroxyl group at the end (trade name Epol, manufactured by Idemitsu Co., Ltd., having two hydroxyl groups in one molecule. Weight average molecular weight 2000) was placed in a flask, and this was placed at 120 ° C. under reduced pressure for 2 hours. Dehydrated. Thereafter, the mixture was cooled to 80 ° C., and 11 g of isophorone diisocyanate (manufactured by Degussa) and 0.01 g of octyltin dilaurate were added thereto and reacted in a nitrogen atmosphere for 6 hours to produce a liquid polymer having an isocyanate group at the terminal. . The obtained liquid polymer is designated as Liquid Polymer 2. The liquid polymer 2 has two isocyanate groups in one molecule. The weight average molecular weight of the liquid polymer 2 was 30000. Liquid polymer 2 was liquid at room temperature.
- Comparative liquid polymer unsubstituted liquid polyisoprene, trade name LIR-30, manufactured by Kuraray Co., Ltd., weight average molecular weight 28,000, glass transition temperature -63 ° C.
- -Reaction catalyst DMDEE Dimorpholino diethyl ether, manufactured by Mitsui Chemicals Fine
- Comparative Example 1 containing no liquid polymer had low water-resistant adhesion. That is, the shear strength retention after water aging (shear strength after hot water test / shear strength after normal test (measured under 20 ° C. condition)) was low.
- the comparative example 2 which does not contain a (meth) acrylic resin did not harden in an initial stage, and the adhesiveness after a normal test and water-resistant adhesiveness were low.
- Comparative Example 3 containing an unsubstituted liquid polymer (comparative liquid polymer) even when the composition was heated to 120 ° C., the unsubstituted liquid polymer was not separated and became uniform in the composition. Therefore, the adhesive strength was also low.
- Examples 1 to 7 were excellent in water-resistant adhesion. That is, the shear strength retention after water aging (shear strength after hot water test / shear strength after normal test (measured under 20 ° C. condition)) was high. Moreover, when Example 1 and Example 5 are compared about the weight average molecular weight of the polyoxyalkylene triol used for manufacture of a urethane prepolymer, Example 1 where the weight average molecular weight of polyoxyalkylene triol is larger is Example. More excellent than 5 in water-resistant adhesion. When Examples 1, 2, and 6 were compared, the smaller the amount of polyoxyalkylene triol, the better the water-resistant adhesion.
- Example 1 Comparing Example 1 and Example 7 with respect to the liquid polymer, Example 1 in which the substituent of the liquid polymer is a (meth) acryloyloxy group is more resistant to water than Example 7 in which the substituent is an isocyanate group. Excellent adhesion.
Abstract
Description
そこで、本発明は耐水接着性に優れる反応性ホットメルト接着剤組成物を提供することを目的とする。
すなわち、本発明者らは、以下の構成により上記課題が解決できることを見出した。
(メタ)アクリル樹脂と、
(メタ)アクリロイルオキシ基及び/又はイソシアネート基を有する液状ポリマーとを含有する、湿気硬化型の反応性ホットメルト接着剤組成物。
(2) 上記液状ポリマーの量が、上記(メタ)アクリル樹脂並びに上記ウレタンプレポリマーの製造に使用される、ポリオール及びポリイソシアネートの合計100質量部に対して、1~5質量部である、上記(1)に記載の反応性ホットメルト接着剤組成物。
(3) 上記ウレタンプレポリマーが、2官能ポリオール及び/又は3官能ポリオールとポリイソシアネートとを反応させることによって製造される化合物であり、
上記2官能ポリオールが、ポリオキシプロピレンジオール、ポリオキシエチレンジオール及びひまし油系ポリオールからなる群から選ばれる少なくとも1種である、上記(1)又は(2)に記載の反応性ホットメルト接着剤組成物。
(4) 上記3官能ポリオールの重量平均分子量が、5,000以上である、上記(3)に記載の反応性ホットメルト接着剤組成物。
(5) 上記3官能ポリオールの量が、上記ウレタンプレポリマーの製造に使用されるポリオール全量中、5~50質量%である、上記(3)又は(4)に記載の反応性ホットメルト接着剤組成物。
本発明の反応性ホットメルト接着剤組成物(本発明の組成物)は、
イソシアネート基を有するウレタンプレポリマーと、
(メタ)アクリル樹脂と、
(メタ)アクリロイルオキシ基及び/又はイソシアネート基を有する液状ポリマーとを含有する、湿気硬化型の反応性ホットメルト接着剤組成物である。
この理由は定かではないが、液状ポリマーの主鎖部分が基材(特にオレフィン)と親和性がよく、さらに(メタ)アクリロイルオキシ基及び/又はイソシアネート基を有することによって、ウレタンプレポリマー及び/又は(メタ)アクリル樹脂との相溶性が高くなり、このことによって優れた接着性(特に耐水接着性)を発現させることができると考えられる。
ウレタンプレポリマーは、1分子内に複数のイソシアネート基を分子末端に含有するウレタンプレポリマーであるのが好ましい態様の1つとして挙げられる。
ウレタンプレポリマーとしては、従来公知のものを用いることができる。例えば、ポリイソシアネートと1分子中に2個以上の活性水素含有基を有する化合物(以下、「活性水素化合物」と略す。)とを、活性水素含有基に対してイソシアネート基が過剰となるように反応させることにより得られる反応生成物等を用いることができる。
本発明において、活性水素含有基は活性水素を含有する基を意味する。活性水素含有基としては例えば、ヒドロキシ基、アミノ基、イミノ基が挙げられる。
ウレタンプレポリマーの製造の際に使用されるポリイソシアネートは、分子内にイソシアネート基を2個以上有するものであれば特に限定されない。
ポリイソシアネートとしては、例えば、トリレンジイソシアネート(TDI。例えば、2,4-トリレンジイソシアネート、2,6-トリレンジイソシアネート)、ジフェニルメタンジイソシアネート(MDI。例えば、4,4′-ジフェニルメタンジイソシアネート、2,4′-ジフェニルメタンジイソシアネート)、1,4-フェニレンジイソシアネート、ポリメチレンポリフェニレンポリイソシアネート、キシリレンジイソシアネート(XDI)、テトラメチルキシリレンジイソシアネート(TMXDI)、トリジンジイソシアネート(TODI)、1,5-ナフタレンジイソシアネート(NDI)、トリフェニルメタントリイソシアネートのような芳香族ポリイソシアネート;ヘキサメチレンジイソシアネート(HDI)、トリメチルヘキサメチレンジイソシアネート(TMHDI)、リジンジイソシアネート、ノルボルナンジイソシアネート(NBDI)、トランスシクロヘキサン-1,4-ジイソシアネート、イソホロンジイソシアネート(IPDI)、ビス(イソシアネートメチル)シクロヘキサン(H6XDI)、ジシクロヘキシルメタンジイソシアネート(H12MDI)のような、脂肪族及び/又は脂環式のポリイソシアネート;これらのカルボジイミド変性ポリイソシアネート、イソシアヌレート変性ポリイソシアネート、アロファネート変性体が挙げられる。
ポリイソシアネートは、それぞれ単独でまたは2種以上を組み合わせて使用することができる。
ウレタンプレポリマーの製造の際に使用される1分子中に2個以上の活性水素含有基を有する化合物(活性水素化合物)は特に限定されない。活性水素含有基としては、例えば、水酸基(OH基)、アミノ基、イミノ基が挙げられる。
活性水素化合物はそれぞれ単独で又は2種以上を組み合わせて使用することができる。
ポリエーテルポリオールとしては、例えば、ポリオキシエチレンジオール(ポリエチレングリコール)、ポリオキシプロピレンジオール(ポリプロピレングリコール:PPG)、ポリオキシプロピレントリオール、エチレンオキサイド/プロピレンオキサイド共重合体、ポリテトラメチレンエーテルグリコール(PTMEG)、ポリテトラエチレングリコールのようなポリオキシアルキレンポリオール;ソルビトール系ポリオール等が挙げられる。
本発明において、ポリオールの重量平均分子量は、GPC法(溶媒:テトラヒドロフラン(THF))により得られたポリスチレン換算値である。
ウレタンプレポリマーはそれぞれ単独でまたは2種以上を組み合わせて使用することができる。
本発明の組成物は(メタ)アクリル樹脂を含有することによって、初期段階において高い接着性を発現させることができる。
本発明において、(メタ)アクリルはアクリル又はメタクリルを意味する。
(メタ)アクリル樹脂は単独重合体、共重合体のいずれであってもよい。
(メタ)アクリル樹脂はそれぞれ単独でまたは2種以上を組み合わせて使用することができる。
本発明の組成物に含有される液状ポリマーは、置換基として(メタ)アクリロイルオキシ基及び/又はイソシアネート基を有する、常温で液状のポリマーである。
本発明の組成物に含有される液状ポリマーは接着付与剤として機能することができる。
(メタ)アクリロイルオキシ基はCH2=CR-CO-O-(Rは水素原子又はメチル基)である。
なお炭化水素基は、1価又は2価以上のものとして例示する。以下の各種炭化水素基の例示についても同様である。
脂環式炭化水素基としては、例えば、シクロペンチル基、シクロヘキシル基が挙げられる。
芳香族炭化水素基としては、例えば、フェニル基、ナフタレン環、アントラセン環が挙げられる。
液状ポリマーの重量平均分子量は、THFを溶媒とするゲル・パーミエーション・クロマトグラフィー(GPC)により標準ポリスチレン換算値である。
例えば、(メタ)アクリロイルオキシ基が有するエステル結合にイソシアネート基を有する炭化水素基が結合する化合物が挙げられる。
液状ポリマーはそれぞれ単独でまたは2種以上を組み合わせて使用することができる。
なお、液状ポリマーは上述したイソシアネート基を有するウレタンポリマー以外のポリマーである。
反応触媒の量は特に制限されない。例えば、従来公知と同様の量とすることができる。
本発明の組成物を2液型に使用する場合、本発明の組成物を主剤(第1液)とし、当該主剤と硬化剤(広義の硬化剤。第2液)とを有するセットとすることができる。
広義の硬化剤(第2液)は硬化成分としての硬化剤(狭義の硬化剤)を含み、狭義の硬化剤はウレタンプレポリマーと反応しうる化合物であれば特に制限されない。例えば、従来公知のものが挙げられる。
プラスチックとしては例えば、ポリプロピレン、ポリエチレンのようなオレフィン樹脂、ポリエチレンテレフタレート(PET)やポリブチレンテレフタレート(PBT)などのポリエステル樹脂、ポリメチルメタクリレート樹脂(PMMA樹脂)、ポリカーボネート樹脂、ポリスチレン樹脂、アクリロニトリル・スチレン共重合樹脂、ポリ塩化ビニル樹脂、アセテート樹脂、ABS樹脂、ポリアミド樹脂のような難接着性樹脂が挙げられる。
本発明の組成物を加熱する温度は、110~130℃であるのが好ましい。
基材への適用方法は特に制限されない。例えば、従来公知のものが挙げられる。
<ウレタンプレポリマーの製造>
第1表のウレタンプレポリマーの欄に示す各成分(ポリイソシアネートを除く。)及び(メタ)アクリル樹脂を同表に示す量(質量部)で反応容器に仕込み、120℃で減圧下2時間攪拌して、ポリオールと(メタ)アクリル樹脂との混合物を脱水した。次に、120℃の条件下で、脱水後の混合物に、第1表のウレタンプレポリマーの欄に示すポリイソシアネートを同表に示す量(質量部)で添加し、常圧下で1時間反応させ、さらに減圧下で1時間攪拌して、ウレタンプレポリマーと(メタ)アクリル樹脂との混合物を製造した。なお、上記ウレタンプレポリマーは、末端にイソシアネート基を有する。
上記のとおり製造されたウレタンプレポリマー(ウレタンプレポリマーの量は第1表のウレタンプレポリマーの欄の各成分の量の合計である。)と(メタ)アクリル樹脂との混合物に対して、第1表に示す液状ポリマーと反応触媒とを同表に示す量(質量部)で添加し、これらを攪拌機で混合して、組成物を製造した。
上記のとおり製造された組成物を用いて以下の評価を行った。結果を第1表に示す。
ブルックフィールド粘度計(ブルックスフィールド社製DV2T粘度計、No.27ローター、回転数5.0rpm)を用いて120℃の条件下で組成物の溶融粘度を測定した。具体的には、組成物を予め120℃に加温し、粘度計カップに11g秤量する。粘度計にセットし120℃で15分加温後ローターをセットしさらに15分加温する。その後測定を開始し、2分後の数値を初期粘度とした。
初期粘度を測定した後、120℃の条件下で90分置き、粘度測定を開始した。開始から2分後の数値を読み取り、老化後の溶融粘度とした。そして、下記の式に当てはめて老化後の増粘率を算出した。
老化後増粘率(%)=[(老化後の溶融粘度-初期粘度)/初期粘度]×100
上記のとおり製造された組成物を120℃で溶融し、これを幅2.5cm、長さ5cmのポリプロピレン(プラズマ処理あり)に塗布した。上記ポリプロピレンを、幅2.5cm、長さ5cmのポリカーボネートと、ラップ面(幅2.5cm、長さ1cm;ラップ面での組成物の厚さ5mm)となるように圧着し、試験片を製造した。
試験片を20℃、50%RHの条件下で1時間養生させ、初期サンプルとした。
上記のとおり得られた初期サンプルを20℃、65%RHの条件下に7日間養生させて、常態試験用サンプルを得た。
上記常態試験用サンプルを用いて引張速度50mm/分で、20℃又は120℃の条件下で剪断強度を測定した。
上記のとおり得られた常態試験用サンプルを120℃の条件下に7日間置く耐熱性試験を行った。試験後のサンプルを耐熱性評価用サンプルとする。
上記耐熱性評価用サンプルを用いて引張速度50mm/分で、20℃の条件下で剪断強度を測定した。耐熱試験後の剪断強度(20℃条件下で測定)は常態の剪断強度(上記の常態試験後の剪断強度(20℃条件下で測定))の70%以上あれば良好とした。
上記のとおり得られた常態試験用サンプルを40℃の温水に7日間浸漬させる耐温水試験を行った。7日経過後、サンプルを温水から引き揚げて耐水接着性評価用サンプルを得た。
上記耐水接着性評価用サンプルを用いて引張速度50mm/分で、20℃の条件下で剪断強度を測定した。
なお、常態の剪断強度(上記の常態試験後の剪断強度(20℃条件下で測定))に対する耐温水試験後の剪断強度(20℃条件下で測定)の保持率(第1表中の「耐水老化後の剪断強度保持率」)が70%以上であれば、耐水接着性に優れると言える。
・液状ポリマー1:メタクリロイルオキシ基を含有する液状ポリイソプレン、商品名UC-102、クラレ社製。1分子中にメタクリロイルオキシ基を2個有する。重量平均分子量19,000、常温で液状。
・反応触媒 DMDEE:ジモルフォリノジエチルエーテル、三井化学ファイン社製
(メタ)アクリル樹脂を含有しない比較例2は、初期段階で硬化せず、常態試験後の接着性、耐水接着性が低かった。
無置換の液状ポリマー(比較液状ポリマー)を含有する比較例3は、組成物を120℃に加熱しても、組成物中において無置換の液状ポリマーが分離して均一とならなかった。そのため接着強度も低かった。
また、ウレタンプレポリマーの製造に使用されるポリオキシアルキレントリオールの重量平均分子量について実施例1と実施例5とを比較すると、ポリオキシアルキレントリオールの重量平均分子量が大きい実施例1のほうが、実施例5よりも耐水接着性により優れた。
実施例1、2、6とを比較すると、ポリオキシアルキレントリオールの量が少なくなるほど、耐水接着性により優れた。
液状ポリマーについて実施例1と実施例7とを比較すると、液状ポリマーが有する置換基が(メタ)アクリロイルオキシ基である実施例1のほうが、当該置換基がイソシアネート基である実施例7よりも耐水接着性により優れた。
Claims (5)
- イソシアネート基を有するウレタンプレポリマーと、
(メタ)アクリル樹脂と、
(メタ)アクリロイルオキシ基及び/又はイソシアネート基を有する液状ポリマーとを含有する、湿気硬化型の反応性ホットメルト接着剤組成物。 - 前記液状ポリマーの量が、前記(メタ)アクリル樹脂並びに前記ウレタンプレポリマーの製造に使用される、ポリオール及びポリイソシアネートの合計100質量部に対して、1~5質量部である、請求項1に記載の反応性ホットメルト接着剤組成物。
- 前記ウレタンプレポリマーが、2官能ポリオール及び/又は3官能ポリオールとポリイソシアネートとを反応させることによって製造される化合物であり、
前記2官能ポリオールが、ポリオキシプロピレンジオール、ポリオキシエチレンジオール及びひまし油系ポリオールからなる群から選ばれる少なくとも1種である、請求項1又は2に記載の反応性ホットメルト接着剤組成物。 - 前記3官能ポリオールの重量平均分子量が、5,000以上である、請求項3に記載の反応性ホットメルト接着剤組成物。
- 前記3官能ポリオールの量が、前記ウレタンプレポリマーの製造に使用されるポリオール全量中、5~50質量%である、請求項3又は4に記載の反応性ホットメルト接着剤組成物。
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JP7268232B1 (ja) | 2022-08-02 | 2023-05-02 | 大日精化工業株式会社 | 湿気硬化型ポリウレタンホットメルト接着剤 |
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WO2022120358A1 (en) * | 2020-12-02 | 2022-06-09 | H.B. Fuller Company | Sustainable reactive hot melt adhesive compositions |
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JP7268232B1 (ja) | 2022-08-02 | 2023-05-02 | 大日精化工業株式会社 | 湿気硬化型ポリウレタンホットメルト接着剤 |
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Also Published As
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US10358586B2 (en) | 2019-07-23 |
EP3150682A4 (en) | 2017-12-20 |
EP3150682B1 (en) | 2020-06-17 |
US20170158929A1 (en) | 2017-06-08 |
JPWO2016002391A1 (ja) | 2017-04-27 |
KR20170023833A (ko) | 2017-03-06 |
EP3150682A1 (en) | 2017-04-05 |
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