WO2016043076A1 - 変性ポリプロピレン樹脂を含有する自己乳化型エマルション - Google Patents
変性ポリプロピレン樹脂を含有する自己乳化型エマルション Download PDFInfo
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- WO2016043076A1 WO2016043076A1 PCT/JP2015/075299 JP2015075299W WO2016043076A1 WO 2016043076 A1 WO2016043076 A1 WO 2016043076A1 JP 2015075299 W JP2015075299 W JP 2015075299W WO 2016043076 A1 WO2016043076 A1 WO 2016043076A1
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- polypropylene resin
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/44—Preparation of metal salts or ammonium salts
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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
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
- C09J123/26—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers modified by chemical after-treatment
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
- C08J3/05—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from solid polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/205—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase
- C08J3/21—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase the polymer being premixed with a liquid phase
- C08J3/215—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase the polymer being premixed with a liquid phase at least one additive being also premixed with a liquid phase
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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
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/06—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
- C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
- C09J123/10—Homopolymers or copolymers of propene
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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
- C09J151/00—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
- C09J151/06—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/26—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers modified by chemical after-treatment
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2351/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2351/06—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
Definitions
- the present invention relates to a self-emulsifying emulsion that exhibits good adhesion performance to olefin-based resin substrates such as polyethylene and polypropylene.
- Patent Document 1 P139 “2.1 Current Status of Adhesion Technology”.
- Patent Document 2 P139 “2.1 Current Status of Adhesion Technology”.
- adhesives are now changing from conventional organic solvent types to more environmentally friendly water systems.
- Patent Documents 3 to 5 show examples.
- emulsions in which polymers are dispersed in water are forcibly emulsified emulsions that are combined with surfactants (emulsifiers), and self-emulsification by introducing hydrophilic polar groups into the polymer chain to give the polymer itself an emulsifying function.
- surfactants emulsifiers
- self-emulsification by introducing hydrophilic polar groups into the polymer chain to give the polymer itself an emulsifying function.
- An emulsifier is extremely useful for stably dispersing a polymer that does not have a self-emulsifying function in water.
- the emulsifier when used as an aqueous adhesive, the emulsifier is contained in an adhesive layer that is applied and dried on an adherend. It remains and adversely affects the adhesion. This is also described in the prior art of Patent Document 5.
- Patent Document 3 paragraph 0116 and Examples describe that the polyolefin resin composition as a main component is water-based by a surfactant (emulsifier). Also in Patent Document 4, it is described in the embodiment of the invention that an acrylic resin mainly composed of an adhesive is subjected to emulsion polymerization in the presence of an emulsifier.
- the polyurethane resin blended is an anionic self-emulsifying urethane resin, while the tackifier blended together is dispersed in water by an emulsifier, paragraph 0017 in each embodiment of the invention. And paragraph 0019.
- the acrylic resin which is the main component, is preferably emulsion polymerized in the presence of a surfactant, but it is emulsion polymerized in the presence of the polyurethane resin self-emulsified in water and a tackifier dispersed in water with an emulsifier. What may be done is described in paragraphs 0024 to 0029 in the same embodiment of the invention.
- the present invention provides a self-emulsifying emulsion of water-based adhesive / adhesive that can be easily prepared without using any emulsifier and exhibits good adhesion performance to olefinic resin base materials such as polyethylene and polypropylene. It is intended.
- the present invention is a self-emulsifying emulsion containing a modified polypropylene resin having an anionic functional group and a tackifier and satisfying the following (1) and (2).
- a modified polypropylene resin having an anionic functional group is dispersed in water without the presence of an emulsifier.
- Dispersion particles made of a modified polypropylene resin having an anionic functional group contain a tackifier.
- the tackifier is preferably in the range of 5 to 80 parts by weight with respect to 100 parts by weight of the modified polypropylene resin.
- the Z-average particle diameter of the modified polypropylene resin dispersion particles is preferably 500 nm or less.
- An adhesive composition containing the self-emulsifying emulsion as described above and an adhesive for polyolefin resin.
- the self-emulsifying emulsion of the present invention has a storage stability because the modified polypropylene resin having an anionic functional group is uniformly and stably dispersed in water in the form of fine particles in a state of including a tackifier. It is good. Furthermore, since an emulsifier is not substantially used, the coating film produced using the emulsion has no unevenness and is excellent in adhesion to polyolefin resins such as polypropylene and polyethylene and water resistance.
- modified polypropylene resin having an anionic functional group has an anionic functional group at least one selected from the group consisting of polypropylene and a propylene- ⁇ -olefin copolymer. It can be obtained by graft copolymerization of the compound having it.
- the anionic functional group is preferably a carboxyl group, and the compound having an anionic functional group is not particularly limited, but at least selected from the group consisting of ⁇ , ⁇ -unsaturated carboxylic acids and acid anhydrides thereof. One type is preferably used.
- the propylene- ⁇ -olefin copolymer is a copolymer in which ⁇ -olefin is copolymerized mainly with propylene.
- ⁇ -olefin for example, one kind or several kinds of ethylene, 1-butene, 1-heptene, 1-octene, 4-methyl-1-pentene and the like can be used. Of these, 1-butene is preferred.
- the ratio of the propylene component to the ⁇ -olefin component of the propylene- ⁇ -olefin copolymer is not particularly limited, but the propylene component is preferably 50 mol% or more.
- the propylene- ⁇ -olefin copolymer polymerized using a metallocene catalyst has uniform crystallinity and is soluble in a solvent. The properties are also excellent and preferable.
- the at least one kind of ⁇ , ⁇ -unsaturated carboxylic acid and acid anhydride thereof is not particularly limited, and examples thereof include maleic acid, itaconic acid, citraconic acid, and acid anhydrides thereof.
- acid anhydrides are preferable, maleic anhydride and itaconic anhydride are more preferable, and maleic anhydride is more preferable.
- Specific examples include maleic anhydride-modified polypropylene, maleic anhydride-modified propylene-ethylene copolymer, maleic anhydride-modified propylene-butene copolymer, maleic anhydride-modified propylene-ethylene-butene copolymer, and the like.
- the amount of graft copolymerization is preferably 0.1 to 10% by weight, and more preferably 1 to 5% by weight. If the amount is too small, the compatibility with the tackifier is lowered, and adhesiveness may not be exhibited. Moreover, when there is too much, stability of an emulsion may fall.
- the solution method is as follows. That is, at least one selected from the group consisting of polypropylene and a propylene- ⁇ -olefin copolymer is dissolved in an aromatic organic solvent such as toluene at 100 to 180 ° C., and then ⁇ , ⁇ -unsaturated carboxylic acid is used. And at least one selected from the group consisting of acid anhydrides thereof, and a radical generator is added in a batch or divided to react.
- the melting method is as follows. That is, at least one selected from the group consisting of polypropylene and a propylene- ⁇ -olefin copolymer is heated and melted to a melting point or higher and then selected from the group consisting of an ⁇ , ⁇ -unsaturated carboxylic acid and its acid anhydride. At least one kind and a radical generator are added and reacted.
- radical generator examples include benzoyl peroxide, dicumyl peroxide, and di-t-butyl peroxide, and can be selected depending on the reaction temperature and decomposition temperature.
- the weight average molecular weight of the modified polypropylene resin having an anionic functional group is preferably 5000 to 200000. If it is less than 5000, the cohesive force becomes weak and the adhesion may be inferior. If it exceeds 200,000, the dissolved state may be poor and dispersion into water may not be performed. A more preferred weight average molecular weight is 30,000 to 120,000.
- ⁇ Tackifier> It is essential that the tackifier used in the present invention has high compatibility with the modified polypropylene resin having an anionic functional group. If the compatibility is poor, the modified polypropylene resin cannot contain the tackifier and a stable emulsion may not be formed.
- the SP value of the tackifier is an approximate measure for judging compatibility.
- the SP value of the tackifier exhibiting good compatibility with the modified polypropylene resin is preferably 8.6 to 8.8 (J / cm 3 ) 1/2 according to the calculation formula of Hoy. It is known that the SP value ( ⁇ ) of a polymer compound such as a tackifier according to Hoy's formula can be obtained as follows.
- ⁇ (polymer compound) ⁇ E / M
- ⁇ is the density of the polymer compound
- M is the molecular weight of the repeating structural unit of the polymer compound
- E is the molar aggregation energy constant of each structural unit constituting the polymer compound.
- the numerical value of E can use the numerical value published in various literature. Examples of documents in which numerical values are described include J. Paint Technology vol. 42 76-118 (1970).
- ⁇ is the density of the polymer compound
- M is the molecular weight of the repeating structural unit of the polymer compound
- E is the molar aggregation energy constant of each structural unit constituting the polymer compound.
- the numerical value of E can use the numerical value published in various literature. Examples of documents in which numerical values are described include J. Paint Technology vol. 42 76-118 (1970).
- As a method of actually confirming the compatibility it is judged that the higher the transparency of the dried coating film prepared by mixing the modified polypropylene resin and the tackifier,
- the transparency can be confirmed visually, but more accurately can be determined by using a HAZE meter (preferably 1.0 or less, more preferably 0.5 or less).
- a HAZE meter preferably 1.0 or less, more preferably 0.5 or less.
- the dynamic viscoelastic properties of the produced dry film are measured, and if the main dispersion peak of the loss elastic modulus (E ′′) is not broad compared with that before the tackifier compounding, it is judged that the compatibility is good. .
- the softening point of the tackifier is preferably 60 ° C. or higher, more preferably 70 ° C. or higher, further preferably 80 ° C. or higher, preferably 160 ° C. or lower, and more preferably 150 ° C. or lower.
- the number average molecular weight is preferably 500 or more, more preferably 700 or more, further preferably 800 or more, preferably 1800 or less, more preferably 1600 or less, and further preferably 1500 or less. If it is less than 500, the properties of the modified polypropylene resin coating film may be deteriorated, or the surface of the coating film may bleed out. If it exceeds 1,800, compatibility with the modified polypropylene resin may be deteriorated.
- the tackifier used in the present invention is not particularly limited, but is preferably selected from a terpene resin, a rosin resin, or a petroleum resin, and more preferably a terpene resin.
- a terpene resin aromatic modified terpene resins are particularly preferable.
- Specific examples of commercially available products include YS resin series (“YS Resin TO125”, “YS Resin TO115”, “YS Resin TO105”, “YS Resin TO85”, “YS Resin TR105”, “YS” manufactured by Yasuhara Chemical Co., Ltd.
- Resin LP SP value: 8.73 (J / cm 3 ) 1/2 ,“ YS Polystar T130 ”SP value 8.81 J / cm 3 ) 1/2 ) and the like.
- the blending amount of the tackifier is preferably 5 parts by weight or more and 80 parts by weight or less, more preferably 10 parts by weight or more and 70 parts by weight or less, further preferably 15 parts by weight or more with respect to 100 parts by weight of the modified propylene resin. 65 parts by weight or less, most preferably 20 parts by weight or more and 60 parts by weight or less. If it is less than 5 parts by weight, the blending effect of the tackifier may not be obtained. If it exceeds 80 parts by weight, the Z-average particle diameter of the encapsulated emulsion may exceed 500 nm, and a stable emulsion may not be formed.
- the self-emulsifying emulsion of the present invention contains a modified polypropylene resin having an anionic functional group and a tackifier, and (1) the modified polypropylene resin having an anionic functional group is dispersed in water without the presence of an emulsifier.
- Dispersion particles made of a modified polypropylene resin having an anionic functional group contain a tackifier.
- Dispersion particles made of a modified polypropylene resin encapsulate a tackifier and disperse uniformly and stably in water in the form of fine particles, so that the storage stability is good, and polyolefin resin groups such as polypropylene and polyethylene Excellent adhesion to materials and water resistance.
- the encapsulated state of the modified polypropylene resin and tackifier in the self-emulsifying emulsion of the present invention is that the propylene chain part (hydrophobic part) of the modified polypropylene resin is inside, and the part having an anionic functional group (hydrophilic part)
- the outer dispersion particles (micellar particles) are formed, and the tackifier is encapsulated inside the modified polypropylene resin.
- the hydrophilic part of the modified polypropylene resin is neutralized with a basic substance.
- the tackifier is encapsulated in the dispersion particles made of the modified polypropylene resin, so that no special equipment such as an extruder or an emulsifier for emulsifying and dispersing the tackifier is required. Moreover, it can be emulsified without the presence of an emulsifier.
- the absence of an emulsifier means that the emulsifier is preferably 0.1 parts by weight or less, more preferably 0.01 parts by weight or less, based on 100 parts by weight of the modified polypropylene resin. More preferably, it is a part. Due to the absence of the emulsifier, the coating film produced using the emulsion has no unevenness and is excellent in adhesion to a polyolefin resin substrate such as polypropylene and polyethylene and water resistance.
- the Z average particle size of the self-emulsifying emulsion is not particularly limited, but is preferably 500 nm or less. More preferably, it is 450 nm or less, More preferably, it is 400 nm or less. If it exceeds 500 nm, a stable emulsion may not be formed. Although a minimum is not specifically limited, Usually, it is 50 nm or more.
- a modified polypropylene resin having an anionic functional group and a tackifier are heated and dissolved in an ether solvent, alcohol solvent, aromatic solvent and water at a predetermined ratio, and a basic substance is added thereto. After neutralizing and cooling, it can be obtained by removing the ether solvent, alcohol solvent and aromatic solvent.
- a modified polypropylene resin having an anionic functional group and a tackifier are heated and dissolved in an ether solvent, an alcohol solvent, an aromatic solvent and water at a predetermined ratio.
- Tetrahydrofuran propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, etc. are mentioned, These can be used individually by 1 type or in combination of 2 or more types. it can. Of these, tetrahydrofuran is preferred.
- the alcohol solvent is not particularly limited, and examples thereof include aliphatic alcohols having 1 to 7 carbon atoms, aromatic alcohols, and alicyclic alcohols. These may be used alone or in combination of two or more. it can. Of these, aliphatic alcohols having 3 to 5 carbon atoms are preferable, and isopropyl alcohol is more preferable.
- the aromatic solvent is not particularly limited, and examples thereof include benzene, toluene, xylene, ethylbenzene, isopropylbenzene, and solvent naphtha. These can be used alone or in combination of two or more. Of these, toluene is preferable.
- the temperature at the time of melting by heating is not particularly limited, but is preferably 50 ° C. or higher. Moreover, if it is 75 degrees C or less, it is below the boiling point of the organic solvent to be used, and a pressure vessel is unnecessary for melt
- the dissolution time is not particularly limited, but can be completely dissolved usually in 1 to 2 hours.
- a basic substance is added while maintaining the same temperature.
- basic substances include, but are not limited to, morpholine; ammonia; amines such as methylamine, ethylamine, dimethylamine, triethylamine, ethanolamine, and dimethylethanolamine. These may be used alone or in combination of two or more. They can be used in combination.
- a preferred basic substance is dimethylethanolamine.
- the amount of the basic substance used is preferably 1 to 5 chemical equivalents and more preferably 1.5 to 3.5 chemical equivalents relative to the carboxyl group of the modified polypropylene resin.
- the self-emulsifying emulsion of the present invention can maintain stability more by maintaining from neutral to alkaline.
- the basic substance As a method for adding the basic substance, it may be added as it is, but it may be diluted with water in order to mix more uniformly.
- the temperature at which the basic substance is added and the dispersion time are not particularly limited, but are preferably 50 ° C. to 75 ° C. like the dissolution temperature, and the time required for dispersion is preferably 1 to 2 hours.
- the organic solvent is removed from the obtained dispersion to obtain a self-emulsifying emulsion.
- it may be distilled off under reduced pressure.
- the degree of pressure reduction and temperature during the distillation are not particularly limited, but is preferably about 90 to 95 KPa (absolute pressure) and about 20 to 60 ° C. At this time, part of the water is also distilled off.
- the residual amount of the organic solvent after distillation under reduced pressure is preferably 1 part by weight or less, more preferably 0.1 part by weight or less, and 0 part by weight with respect to 100 parts by weight of the modified polypropylene resin. Is particularly preferred. An additional amount of water can be added as necessary.
- a curing agent can be blended in the self-emulsifying emulsion of the present invention as necessary.
- a water-soluble polyfunctional epoxy resin a water-soluble polyfunctional carbodiimide resin, an aqueous dispersion of a polyfunctional isocyanate compound, a water-soluble silane coupling agent having a polyfunctional silyl group, and the like can be given.
- water-soluble polyfunctional epoxy resins are preferred.
- additives such as various fillers, pigments, colorants, and antioxidants may be blended in the self-emulsifying emulsion of the present invention as long as the adhesive performance is not lowered.
- the self-emulsifying emulsion obtained in the present invention has excellent adhesion to polyolefin resin substrates, so it can be used for primer, paint, ink, coating agent and adhesive for painting, printing, adhesion and coating. Useful.
- the polyolefin-based resin substrate may be appropriately selected from conventionally known polyolefin resins.
- polyethylene, polypropylene, ethylene-propylene copolymer, and the like can be used. You may mix
- the untreated surface of a 25mm x 200mm size 60 ⁇ m thick OPP film is bonded to the coated surface immediately after taking out from the dryer so that the chuck grip is in the same direction, and an oven of 100 ° C is applied with a load of 120kg / m 2 Was aged for 10 minutes to obtain an adhesive sample.
- the adhesion sample taken out from the oven was left at room temperature overnight, and then a peel test was performed using a tensile tester (“RTM-100” manufactured by Orientec). As for the pulling condition, the end of the polyethylene test piece was held on one side of the chuck of the testing machine, and the end of the OPP film was held on the other side.
- a 5 kgf load cell was used, and the 180 ° peel test was performed by pulling up and down at a pulling speed of 50 mm / min. . The test was carried out four times, and the average value of the measured strengths was taken as the peel strength. At the same time, the peeled surface was observed to confirm the peeled state.
- each strip-shaped coating film was taken out, put into a hermetic metal can, and the coating weight was precisely weighed.
- the strip-shaped coating film was taken out from the metal can, immersed in warm water at 40 ° C. for 5 minutes, then taken out and the surface adhering water was carefully wiped off with gauze, and again put into a sealed metal can and weighed accurately.
- the weight increase rate of the coating film due to water absorption before and after immersion in warm water was calculated and used as an index of water resistance.
- the evaluation criteria were as follows according to the weight increase rate of the coating film. ⁇ : Weight increase rate after immersion in warm water ⁇ 2.5% ⁇ : Weight increase rate after immersion in warm water 2.5-3.5% X: Weight increase rate after immersion in hot water> 3.5%
- Example 1 188 g of deionized water, modified polypropylene resin having an anionic functional group, acid-modified polyolefin (propylene-1-butene copolymer polymerized using a metallocene catalyst (76 mol% of propylene component and 24 mol of 1-butene component) %), Grafting amount of maleic anhydride: 2.4% by weight, weight average molecular weight: 60000, melt viscosity at 230 ° C .: 1950 mPa ⁇ s, melting point: 70 ° C., 50 g, tackifier made by Yasuhara Chemical (“YS Resin TO125 ”; Modified terpene resin, SP value of 8.73 (J / cm 3 ) 1/2 ) according to Hoy's formula, 7.5 g of tetrahydrofuran, 5 g of isopropyl alcohol, and 5 g of toluene were placed in a flask equipped with a stirrer, and the temperature reached 70
- the obtained emulsion (1) had a solid content concentration of 35.4% by weight, a viscosity at 25 ° C. of 36.7 mPa ⁇ s, a pH of 8.4, and an average particle size of 140 nm.
- Example 2 In the same manner as in Example 1 above, only the amount of Yasuhara Chemical tackifier (“YS Resin TO125”; modified terpene resin) added was operated at 15 g to obtain a pure cloudy uniform emulsion (2).
- the resulting emulsion (2) has a solid content concentration of 32.7% by weight, a viscosity at 25 ° C. of 10.6 mPa ⁇ s, a pH of 8.4, an average particle size of 175 nm, and the content of the tackifier is It was confirmed that it was 30 phr according to the charged composition ratio (30 parts by weight of a tackifier with respect to 100 parts by weight of the modified polypropylene resin).
- Example 3 By the same method as in Example 1 above, only the amount of Yasuhara Chemical tackifier (“YS Resin TO125”; modified terpene resin) added was operated at 20 g to obtain a pure cloudy uniform emulsion (3).
- the emulsion (3) has a solid content concentration of 35.0% by weight, a viscosity at 25 ° C. of 11.5 mPa ⁇ s, a pH of 8.5, an average particle size of 174 nm, and the tackifier content in accordance with the charged composition ratio. 40 phr (40 parts by weight of a tackifier with respect to 100 parts by weight of the modified polypropylene resin).
- Example 4 In the same manner as in Example 1 above, only Yasuhara Chemical tackifier (“YS Resin TO125”; modified terpene resin) was added at 25.0 g to obtain a pure cloudy uniform emulsion (4). It was.
- This emulsion (4) had a solid content concentration of 38.1% by weight, a viscosity at 25 ° C. of 19.7 mPa ⁇ s, a pH of 8.4, and an average particle size of 175 nm.
- the tackifier content was 50 phr according to the charged composition ratio (50 parts by weight of the tackifier with respect to 100 parts by weight of the modified polypropylene resin).
- Example 5 20 g of “YS Resin TO105” (modified terpene resin, SP value of 8.73 (J / cm 3 ) 1/2 ) according to the calculation formula of Hoy) was added as a tackifier made by Yasuhara Chemical in the same manner as in Example 1 above. To obtain a uniform emulsion (5) having a pure cloudy color.
- the emulsion (4) had a solid content concentration of 34.2% by weight, a viscosity at 25 ° C. of 10.4 mPa ⁇ s, a pH of 8.5, and an average particle size of 172 nm.
- the tackifier content was 40 phr (40 parts by weight of tackifier with respect to 100 parts by weight of the modified polypropylene resin) according to the charged composition ratio.
- the emulsion was stored in an incubator at 40 ° C., and the storage stability was evaluated. As a result, no change was observed in the appearance after 3 months.
- Table 1 Also, using the emulsion (5), an adhesion sample (5) and a water resistance test sample (5) were prepared according to the above procedure, and the olefin-based substrate adhesion and water resistance were evaluated. The results are summarized in Table 2.
- Example 6 In the same manner as in Example 1, 30 “YS Polystar T130” (terpene phenol resin, SP value of 8.81 (J / cm 3 ) 1/2 ) according to the calculation formula of Hoy) was added as a tackifier made by Yasuhara Chemical. To obtain a slightly yellowish uniform emulsion (6).
- the emulsion (6) had a solid content concentration of 34.7% by weight, a viscosity at 25 ° C. of 16.2 mPa ⁇ s, a pH of 8.7, and an average particle size of 188 nm.
- the tackifier content was 60 phr according to the charged composition ratio (60 parts by weight of the tackifier with respect to 100 parts by weight of the modified polypropylene resin).
- Comparative Example 1 is a case where the emulsion particles of the modified polypropylene resin having an anionic functional group do not include a tackifier
- Comparative Example 2 is emulsifying the modified polypropylene resin having an anionic functional group using an emulsifier.
- no tackifier was included.
- Comparative Example 3 an attempt was made to simultaneously emulsify a modified polypropylene resin having an anionic functional group and a tackifier with an emulsifier, and a uniform and stable emulsion could not be formed.
- Comparative Example 4 is an example in which only a tackifier was attempted to be emulsified with an emulsifier, and a uniform and stable emulsion was not obtained.
- Comparative Example 1 In the same manner as in Example 1, the operation was carried out without adding only the tackifier (“YS resin TO125”; modified terpene resin) to obtain a pure cloudy uniform emulsion (7).
- the emulsion (7) had a solid content concentration of 30.7% by weight, a viscosity at 25 ° C. of 24.0 mPa ⁇ s, a pH of 8.7, and an average particle size of 110 nm.
- the emulsion was stored in an incubator at 40 ° C., and the storage stability was evaluated. As a result, no change was observed in the appearance after 3 months.
- Table 1 In addition, using the emulsion (7), an adhesion sample (7) and a water resistance test sample (7) were prepared according to the above procedure, and olefin-based substrate adhesion and water resistance were evaluated. The results are summarized in Table 2.
- modified polypropylene resins having an anionic functional group examples include acid-modified polyolefins (propylene-1-butene copolymer polymerized using a metallocene-based catalyst (76 mol% of propylene component and 24 mol% of 1-butene component), anhydrous maleic acid) Graft amount of acid: 2.4% by weight, weight average molecular weight: 60000, melt viscosity at 230 ° C .: 1950 mPa ⁇ s, melting point: 70 ° C.) 50 g and tetrahydrofuran 150 g are put in a flask equipped with a stirrer and heated to 60 ° C. And dissolved at the same temperature.
- acid-modified polyolefins propylene-1-butene copolymer polymerized using a metallocene-based catalyst (76 mol% of propylene component and 24 mol% of 1-butene component), anhydrous maleic acid) Graft amount of acid: 2.4%
- the emulsion (8) had a solid content concentration of 28.8% by weight, a viscosity at 25 ° C. of 8.3 mPa ⁇ s, a pH of 8.1, and an average particle size of 360 nm.
- the emulsion was stored in an incubator at 40 ° C., and the storage stability was evaluated. As a result, sedimentation components were observed after 2 weeks, and the solid phase separated and settled after 3 months.
- Comparative Example 3 In the same manner as Comparative Example 2, in addition to the modified polypropylene resin having an anionic functional group, 7.5 g of Yasuhara Chemical tackifier (“YS Resin TO125”; modified terpene resin) was blended and dissolved in 150 g of tetrahydrofuran by heating. However, a large amount of coarse particles were generated during the deionized water dropping, and a uniform dispersion could not be obtained.
- Yasuhara Chemical tackifier Yasuhara Chemical tackifier
- composition and properties of the emulsions prepared in the above examples and comparative examples are shown in Table 1, and the adhesion properties to the polyolefin-based resin substrate are evaluated and summarized in Table 2.
- Tables 1 and 2 according to the present invention, it is possible to easily prepare a modified polypropylene emulsion containing a tackifier without using an emulsifier. Adhesiveness is greatly improved.
- the self-emulsifying emulsion of the present invention has excellent adhesion to polyolefin resin substrates, it is useful for primer for painting, printing, adhesion and coating, and for applications of paint, ink, coating agent and adhesive. is there.
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Abstract
Description
(1)アニオン性官能基を有する変性ポリプロピレン樹脂が乳化剤の存在無しに水中に分散している
(2)アニオン性官能基を有する変性ポリプロピレン樹脂からなる分散体粒子が粘着付与剤を内包している
アニオン性官能基を有する変性ポリプロピレン樹脂(以下、単に「変性ポリプロピレン樹脂」ともいう。)は、ポリプロピレンおよびプロピレン-α-オレフィン共重合体からなる群より選ばれる少なくとも1種に、アニオン性官能基を有する化合物をグラフト共重合して得ることができる。アニオン性官能基としては、カルボキシル基であることが好ましく、アニオン性官能基を有する化合物としては、特に限定されないが、α,β-不飽和カルボン酸およびその酸無水物からなる群より選ばれる少なくとも1種を用いることが好ましい。ここで、プロピレン-α-オレフィン共重合体とは、プロピレンを主体としてこれにα-オレフィンを共重合したものである。α-オレフィンとしては、例えば、エチレン、1-ブテン、1-ヘプテン、1-オクテン、4-メチル-1-ペンテンなどを1種または数種用いることができる。これらの中では、1-ブテンが好ましい。プロピレン-α-オレフィン共重合体のプロピレン成分とα-オレフィン成分との比率には特に制限はないが、プロピレン成分が50モル%以上であることが好ましい。
本発明で使用される粘着付与剤はアニオン性官能基を有する変性ポリプロピレン樹脂に対して相溶性の高い事が必須の条件である。相溶性が悪い場合、変性ポリプロピレン樹脂が粘着付与剤を内包する事が出来ず、安定なエマルションが形成されないことがある。粘着付与剤のSP値は相溶性を判断するおよその目安となる。変性ポリプロピレン樹脂に対して良好な相溶性を示す粘着付与剤のSP値はHoyの計算式による値で、8.6~8.8(J/cm3)1/2であることが好ましい。Hoyの計算式による粘着付与剤の様な高分子化合物のSP値(δ)は次の様にして求められる事が知られている。
δ(高分子化合物)=ρΣE/M
ここでρ:高分子化合物の密度、M:高分子化合物の繰り返し構造単位の分子量、E:高分子化合物を構成する個々の構造単位のモル凝集エネルギー定数である。Eの数値は種々文献に掲載されている数値を使用する事が出来る。数値が記載されている文献としては例えば、J.Paint Technology vol.42 76-118 (1970)が挙げられる。
また、実際に相溶性を確認する方法としては変性ポリプロピレン樹脂と粘着付与剤を混ぜ合わせて作製した乾燥塗膜の透明性が高いほど相溶性が高いと判断される。透明性は目視で確認することができるが、より正確にはHAZEメーター(1.0以下が好ましく、更に好ましくは0.5以下)等を使用する事で判断できる。或いは上記作製した乾燥フィルムの動的粘弾性特性を測定し、損失弾性率(E”)の主分散ピークが粘着付与剤配合前と比較しブロードになっていなければ相溶性が良好と判断される。
本発明の自己乳化型エマルションは、アニオン性官能基を有する変性ポリプロピレン樹脂と粘着付与剤を含有し、(1)アニオン性官能基を有する変性ポリプロピレン樹脂が乳化剤の存在無しに水中に分散しており、(2)アニオン性官能基を有する変性ポリプロピレン樹脂からなる分散体粒子が粘着付与剤を内包しているものである。
50mlガラス製秤量瓶にサンプルのエマルション約1gを採り、精秤する。次いでサンプルを採取した秤量瓶を120℃の熱風乾燥機で2時間乾燥させ、取り出した秤量瓶をデシケーターに入れ、室温で30分放置・冷却する。デシケーターから秤量瓶を取り出し、重量を精秤し、熱風乾燥前後の重量変化(下記式)からエマルション固形分濃度の重量%を算出する。
エマルション固形分濃度(重量%)=[(熱風乾燥前のサンプル重量)-(熱風乾燥後のサンプル重量)]/(熱風乾燥前のサンプル重量)×100
上記固形分濃度の測定で得られた乾燥サンプル(樹脂)を重クロロホルムに溶解し、ヴァリアン社製核磁気共鳴分析計(NMR)“ジェミニ-400-MR”を用い、1H-NMR分析により変性ポリプロピレン樹脂と粘着付与剤の比率を求めた。
東機産業(株)製“Viscometer TV-22”(E型粘度計)を用い、0.6gのサンプルをローターNo.0.8°(=48’)×R24、レンジH、回転数5rpm、25℃の条件で測定した。
堀場製作所製“pH meter F-52”を用い、25℃での値を測定した。尚、測定器の校正は和光純薬工業(株)製、フタル酸塩pH標準液(pH:4.01)、中性燐酸塩pH標準液(pH:6.86)、ホウ酸塩pH標準液(pH9.18)を用い、3点測定で実施した。
Malvern社製“ゼータサイザーナノ Nano-ZS Model ZEN3600”を用い、0.05g/Lの濃度に調製したサンプルを25℃で3回測定し、その平均値とした。
実施例・比較例で調製されたエマルションを40℃のインキュベーターで静置状態で保存し、エマルションの経時外観変化を観察した。長期間(3ヶ月以上)外観に変化がないものほど良好である。結果を表1に記載した。
実施例・比較例で得られたエマルションにレベリング剤としてダイノール(登録商標)604(エアープロダクツ(株)製)をエマルションに対して0.5重量%配合した。配合物を、(株)パルテック社製2mm厚、25mm×100mmサイズの高密度ポリエチレンテストピースに#16Eのワイヤーバーを用いて、引っ張り試験機のチャックつかみしろとしてテストピース片端約1cmを残して塗工し、100℃の熱風乾燥機で10分乾燥させた。乾燥機から取り出した直後の塗工面に25mm×200mmサイズの60μm厚OPPフィルムの未処理面をチャックつかみしろが同じ方向になる様に貼り合せ、120kg/m2の荷重を掛けて100℃のオーブンで10分間エージングし、接着サンプルを得た。オーブンから取り出した接着サンプルを室温で一晩放置後、引っ張り試験機(Orientec社製“RTM-100”)を用い剥離試験を実施した。引っ張り条件は試験機のチャックの片方でポリエチレンテストピースの端を、他方でOPPフィルムの端をつかみ、5kgfロードセルを用い、50mm/分の引っ張り速度で上下方向に引いて180°剥離試験を実施した。同試験を4回実施し、測定強度の平均値を剥離強度とした。同時に剥離面を観察し、剥離状態を確認した。
(判定)
◎:3.0N/cm以上(ポリエチレン界面で剥離した部分とOPP界面で剥離した部分が両方混在しており、強い接着強度が得られる。)
○:2.0N/cm以上3.0N/cm未満(ポリエチレン界面剥離、比較的強い接着性が得られる。)
△:1.0N/cm以上2.0N/cm未満(ポリエチレン界面剥離、弱い接着性が得られる。)
×:1.0N/cm未満(ポリエチレン界面剥離、殆ど接着性が得られない。)
実施例・比較例で得られたエマルションにレベリング剤としてダイノール(登録商標)604(エアープロダクツ(株)製)をエマルションに対して0.5重量%配合した。配合物の塗工液を#40Eワイヤーバーを用いて25μm厚のOPPフィルムに塗布し、熱風乾燥機で120℃、30分間乾燥させた。得られた塗工膜を2.5cm×30cmの短冊状にカットし、シリカゲルを入れたデシケーター内で24時間保存し、乾燥させ、短冊状塗膜(耐水性試験サンプル)を得た。次いで個々の短冊状塗膜を取り出し、密閉性の金属缶に入れて塗膜重量を精秤した。金属缶から短冊状塗膜を取り出し、40℃の温水に5分間浸漬した後、取り出して表面付着水をガーゼで丁寧にふき取り、再度密閉性の金属缶に入れて精秤した。温水浸漬前後の吸水による塗布膜の重量増加率を計算し、耐水性の指標とした。塗布膜の重量増加率により、評価基準を以下の様にした。
○:温水浸漬後の重量増加率 <2.5%
△:温水浸漬後の重量増加率 2.5~3.5%
×:温水浸漬後の重量増加率 >3.5%
脱イオン水188g、アニオン性官能基を有する変性ポリプロピレン樹脂として、酸変性ポリオレフィン(メタロセン系触媒を用いて重合されたプロピレン-1-ブテン共重合体(プロピレン成分76モル%および1-ブテン成分24モル%)、無水マレイン酸のグラフト量:2.4重量%、重量平均分子量:60000、230℃での溶融粘度:1950mPa・s、融点:70℃)50g、ヤスハラケミカル製粘着付与剤(“YSレジンTO125”;変性テルペン樹脂、Hoyの計算式によるSP値8.73(J/cm3)1/2)7.5g、テトラヒドロフラン70g、イソプロピルアルコール5gおよびトルエン5gを撹拌機付きフラスコに入れ、70℃に昇温した後、同温度で2時間、加熱溶解した。次に、ジメチルエタノールアミン3.3g(アミノ基当量:0.037当量)を添加し、2時間かけて徐々に40℃まで冷却した。その後、91KPa(絶対圧力)の減圧度で有機溶剤/水を留去し、純白濁色の均一なエマルション(1)を得た。得られたこのエマルション(1)の固形分濃度は35.4重量%、25℃での粘度は36.7mPa・s、pHは8.4、平均粒子径は140nmであった。また、NMRによる粘着付与剤の含有量は仕込み組成比どおり15phr(変性ポリプロピレン樹脂100重量部に対して粘着付与剤15重量部)である事を確認した。エマルション(1)を40℃のインキュベーターに保存し、保存安定性を評価したところ、3ヶ月経過時点で外観に変化は認められなかった。これら結果を表-1にまとめた。また、エマルション(1)を用いて、上記手順に従って接着サンプル(1)及び耐水性試験サンプル(1)を作製し、オレフィン系基材接着性及び耐水性の評価を行った。結果を表-2にまとめた。
上記実施例1と同様の方法で、ヤスハラケミカル製粘着付与剤(“YSレジンTO125”;変性テルペン樹脂)の添加量のみを15gとして操作し、純白濁色の均一なエマルション(2)を得た。得られたこのエマルション(2)の固形分濃度は32.7重量%、25℃での粘度は10.6mPa・s、pHは8.4、平均粒子径は175nm、粘着付与剤の含有量は仕込み組成比どおり30phr(変性ポリプロピレン樹脂100重量部に対して粘着付与剤30重量部)である事を確認した。エマルション(2)を40℃のインキュベーターに保存し、保存安定性を評価したところ、3ヶ月経過時点で外観に変化は認められなかった。これら結果を表-1にまとめた。また、エマルション(2)を用いて、上記手順に従って接着サンプル(2)及び耐水性試験サンプル(2)を作製し、オレフィン系基材接着性及び耐水性の評価を行った。結果を表-2にまとめた。
上記実施例1と同様の方法で、ヤスハラケミカル製粘着付与剤(“YSレジンTO125”;変性テルペン樹脂)の添加量のみを20gとして操作し、純白濁色の均一なエマルション(3)を得た。このエマルション(3)の固形分濃度は35.0重量%、25℃での粘度は11.5mPa・s、pHは8.5、平均粒子径は174nm、粘着付与剤含有量は仕込み組成比どおり40phr(変性ポリプロピレン樹脂100重量部に対して粘着付与剤40重量部)であった。エマルションは40℃のインキュベーターに保存し、保存安定性を評価したところ、3ヶ月経過時点で外観に変化は認められなかった。これら結果を表-1にまとめた。また、エマルション(3)を用いて、上記手順に従って接着サンプル(3)及び耐水性試験サンプル(3)を作製し、オレフィン系基材接着性及び耐水性の評価を行った。結果を表-2にまとめた。
上記実施例1と同様の方法で、ヤスハラケミカル製粘着付与剤(“YSレジンTO125”;変性テルペン樹脂)の添加量のみを25.0gとして操作し、純白濁色の均一なエマルション(4)を得た。このエマルション(4)の固形分濃度は38.1重量%、25℃での粘度は19.7mPa・s、pHは8.4、平均粒子径は175nm、であった。粘着付与剤含有量は仕込み組成比どおり50phr(変性ポリプロピレン樹脂100重量部に対して粘着付与剤50重量部)であった。エマルションは40℃のインキュベーターに保存し、保存安定性を評価したところ、3ヶ月経過時点で外観に変化は認められなかった。これら結果を表-1にまとめた。また、エマルション(4)を用いて、上記手順に従って接着サンプル(4)耐水性試験サンプル(4)を作製し、オレフィン系基材接着性及び耐水性の評価を行った。結果を表-2にまとめた。
上記実施例1と同様の方法で、ヤスハラケミカル製粘着付与剤として“YSレジンTO105”(変性テルペン樹脂、Hoyの計算式によるSP値8.73(J/cm3)1/2)を20g添加して操作し、純白濁色の均一なエマルション(5)を得た。このエマルション(4)の固形分濃度は34.2重量%、25℃での粘度は10.4mPa・s、pHは8.5、平均粒子径は172nmであった。粘着付与剤含有量は仕込み組成比どおり40phr(変性ポリプロピレン樹脂100重量部に対して粘着付与剤40重量部)であった。エマルションは40℃のインキュベーターに保存し、保存安定性を評価したところ、3ヶ月経過時点で外観に変化は認められなかった。これら結果を表-1にまとめた。また、エマルション(5)を用いて、上記手順に従って接着サンプル(5)及び耐水性試験サンプル(5)を作製し、オレフィン系基材接着性及び耐水性の評価を行った。結果を表-2にまとめた。
上記実施例1と同様の方法で、ヤスハラケミカル製粘着付与剤として“YSポリスターT130”(テルペンフェノール樹脂、Hoyの計算式によるSP値8.81(J/cm3)1/2)を30添加して操作し、微濁黄色の均一なエマルション(6)を得た。このエマルション(6)の固形分濃度は34.7重量%、25℃での粘度は16.2mPa・s、pHは8.7、平均粒子径は188nmであった。粘着付与剤含有量は仕込み組成比どおり60phr(変性ポリプロピレン樹脂100重量部に対して粘着付与剤60重量部)であった。エマルションは40℃のインキュベーターに保存し、保存安定性を評価したところ、3ヶ月経過時点で外観に変化は認められなかった。これら結果を表-1にまとめた。また、エマルション(6)を用いて、上記手順に従って接着サンプル(6)及び耐水性試験サンプル(6)を作製し、オレフィン系基材接着性及び耐水性の評価を行った。結果を表-2にまとめた。
上記実施例1と同様の方法で、粘着付与剤(“YSレジンTO125”;変性テルペン樹脂)のみを添加せずに操作し、純白濁色の均一なエマルション(7)を得た。このエマルション(7)の固形分濃度は30.7重量%、25℃での粘度は24.0mPa・s、pHは8.7、平均粒子径は110nmであった。エマルションは40℃のインキュベーターに保存し、保存安定性を評価したところ、3ヶ月経過時点で外観に変化は認められなかった。これら結果を表-1にまとめた。また、エマルション(7)を用いて、上記手順に従って接着サンプル(7)耐水性試験サンプル(7)を作製し、オレフィン系基材接着性及び耐水性の評価を行った。結果を表-2にまとめた。
アニオン性官能基を有する変性ポリプロピレン樹脂として、酸変性ポリオレフィン(メタロセン系触媒を用いて重合されたプロピレン-1-ブテン共重合体(プロピレン成分76モル%および1-ブテン成分24モル%)、無水マレイン酸のグラフト量:2.4重量%、重量平均分子量:60000、230℃での溶融粘度:1950mPa・s、融点:70℃)50g、テトラヒドロフラン150gを撹拌機付きフラスコに入れ、60℃に昇温し、同温度で加熱溶解した。溶解確認後、トリエチルアミン1.8gを添加し、次いで乳化剤として花王(株)製“ネオペレックス(登録商標)G-65”(アルキルベンゼンスルホン酸系;固形分65%)5gを5gのテトラヒドロフランに溶解して添加し、均一に攪拌した。次いで脱イオン水300gを1時間かけて滴下し、60℃で30分攪拌後、40℃まで冷却した。90KPa(絶対圧力)の減圧度で有機溶剤/水を留去し、乳白濁色の均一なエマルション(8)を得た。このエマルション(8)の固形分濃度は28.8重量%、25℃での粘度は8.3mPa・s、pHは8.1、平均粒子径は360nmであった。エマルションは40℃のインキュベーターに保存し、保存安定性を評価したところ、2週間経過時点で沈降成分が観察され、3ヶ月経過時点では固形化した相が相分離して沈降した。これら結果を表-1にまとめた。また、エマルション(8)を用いて、上記手順に従って接着サンプル(8)及び耐水性試験サンプル(8)を作製し、オレフィン系基材接着性及び耐水性の評価を行った。結果を表-2にまとめた。
比較例2と同様の方法で、アニオン性官能基を有する変性ポリプロピレン樹脂に加えて、ヤスハラケミカル製粘着付与剤(“YSレジンTO125”;変性テルペン樹脂)7.5gを配合し、テトラヒドロフラン150gに加熱溶解したが、脱イオン水滴下中に粗大粒子が多量に発生し、均一な分散体が得られなかった。
ヤスハラケミカル製粘着付与剤(“YSレジンTO125”;変性テルペン樹脂)20gをトルエン17gに60℃加温下で溶解し、乳化剤として花王(株)製“ネオペレックスG-65”(アルキルベンゼンスルホン酸系;固形分65%)3gを3gのテトラヒドロフランに溶解添加した。同温度で脱イオン水30gを20分間で滴下し、30分間同温度で攪拌した後、90KPa(絶対圧力)の減圧度で有機溶剤/水を留去したが、均一な分散体は得られなかった。
Claims (6)
- アニオン性官能基を有する変性ポリプロピレン樹脂と粘着付与剤を含有し、下記(1)および(2)を満足する自己乳化型エマルション。
(1)アニオン性官能基を有する変性ポリプロピレン樹脂が乳化剤の存在無しに水中に分散している
(2)アニオン性官能基を有する変性ポリプロピレン樹脂からなる分散体粒子が粘着付与剤を内包している - 前記粘着付与剤が変性ポリプロピレン樹脂100重量部に対して5重量部以上80重量部以下の範囲である事を特徴とする請求項1記載の自己乳化型エマルション。
- 前記変性ポリプロピレン樹脂分散体粒子のZ平均粒子径が500nm以下である請求項1または2に記載の自己乳化型エマルション。
- 請求項1~3のいずれかに記載の自己乳化型エマルションを含有する接着剤組成物。
- ポリオレフィン系樹脂用接着剤である請求項4に記載の接着剤組成物。
- アニオン性官能基を有する変性ポリプロピレン樹脂と粘着付与剤を溶剤および水に溶解させ、塩基性物質を加えた後に、前記溶剤を除去する自己乳化型エマルションの製造方法。
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