WO2022050225A1 - 反応性ホットメルト接着剤組成物、並びに接着体及びその製造方法 - Google Patents
反応性ホットメルト接着剤組成物、並びに接着体及びその製造方法 Download PDFInfo
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- WO2022050225A1 WO2022050225A1 PCT/JP2021/031754 JP2021031754W WO2022050225A1 WO 2022050225 A1 WO2022050225 A1 WO 2022050225A1 JP 2021031754 W JP2021031754 W JP 2021031754W WO 2022050225 A1 WO2022050225 A1 WO 2022050225A1
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- WIPO (PCT)
- Prior art keywords
- polyester polyol
- adhesive composition
- structural unit
- unit derived
- carbon atom
- Prior art date
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Classifications
-
- 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
-
- 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
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- 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
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
-
- 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
- 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
- C09J2301/304—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 the adhesive being heat-activatable, i.e. not tacky at temperatures inferior to 30°C
Definitions
- the present invention relates to a reactive hot melt adhesive composition, an adhesive, and a method for producing the same.
- Hot melt adhesive is a solvent-free adhesive, it has less impact on the environment and the human body and can be adhered in a short time, so it is an adhesive suitable for improving productivity.
- Hot melt adhesives can be broadly divided into two types: those containing a thermoplastic resin as a main component and those containing a reactive resin as a main component.
- a reactive resin a urethane prepolymer having an isocyanate group at the end is mainly used.
- the reactive hot melt adhesive containing urethane prepolymer as the main component develops a certain degree of adhesive strength in a short time by cooling and solidifying the adhesive itself after application. After that, the terminal isocyanate group of the urethane prepolymer reacts with moisture (moisture in the air or on the surface of the adherend) to increase the molecular weight, and crosslinks occur to develop heat resistance.
- moisture moisture in the air or on the surface of the adherend
- crosslinks occur to develop heat resistance.
- Such adhesives are also referred to as "moisture-curable reactive hot melt adhesives”.
- Reactive hot melt adhesives containing urethane prepolymer as the main component show good adhesive strength even when heated.
- Japanese Unexamined Patent Publication No. 06-1228060 Japanese Unexamined Patent Publication No. 64-054089 Japanese Unexamined Patent Publication No. 52-037936
- the area of the adhesive part between parts tends to become smaller.
- the adhesive layer formed from the reactive hot melt adhesive is required to have high impact resistance.
- the reactive hot melt adhesive composition contains a polymer chain having a structural unit derived from a polyol including a polyester polyol and a structural unit derived from polyisocyanate, and has an isocyanate group as a terminal group of the polymer chain, a urethane prepolymer.
- the polyester polyol is a polyester polyol having a structural unit derived from an aliphatic dihydric carboxylic acid and a structural unit derived from an aliphatic dihydric alcohol, and is at least one of the aliphatic dihydric carboxylic acid and the aliphatic dihydric alcohol.
- a polyester polyol having a tertiary carbon atom or a quaternary carbon atom is contained.
- the two carboxy groups are an aliphatic chain (saturated aliphatic chain (alkylene chain) or unsaturated aliphatic chain (alkenylene chain), preferably saturated aliphatic chain (alkylene chain)).
- the aliphatic dihydric alcohol means a compound linked by, and the two hydroxyl groups are an aliphatic chain (saturated aliphatic chain (alkylene chain) or unsaturated aliphatic chain (alkenylene chain), preferably a saturated aliphatic chain.
- Alkylene chain means a compound linked by.
- the tertiary carbon atom means a carbon atom bonded to three carbon atoms
- the quaternary carbon atom means a carbon atom bonded to four carbon atoms.
- the tertiary carbon atom or the quaternary carbon atom is present in the aliphatic chain of the aliphatic dihydric carboxylic acid or the aliphatic chain of the aliphatic dihydric alcohol. That is, having a tertiary carbon atom or a quaternary carbon atom in the molecule means having a branched structure in the aliphatic chain and having a side chain.
- the aliphatic dihydric alcohol has a tertiary carbon atom or a quaternary carbon atom in the molecule because of the availability of raw materials. Is preferable.
- the adhesive body includes a first adherend, a second adherend, and an adhesive layer for adhering the first adherend and the second adherend to each other.
- the adhesive layer contains a cured product of the above reactive hot melt adhesive composition.
- the method for producing the adhesive includes a step of melting the above-mentioned reactive hot melt adhesive composition and applying it to a first adherend to form an adhesive layer, and a second coating on the adhesive layer. It comprises a step of arranging the adherend and crimping the second adherend to obtain an adhesive precursor, and a step of curing the adhesive layer in the adhesive precursor.
- a reactive hot melt adhesive composition capable of forming an adhesive layer having high impact resistance. Further, according to the present invention, there is provided an adhesive using such a reactive hot melt adhesive composition and a method for producing the same.
- polyol means a compound having two or more hydroxyl groups in the molecule.
- polyisocyanate means a compound having two or more isocyanate groups in the molecule.
- the numerical range indicated by using "-" indicates a range including the numerical values before and after "-" as the minimum value and the maximum value, respectively.
- the upper limit value or the lower limit value of the numerical range of one step may be replaced with the upper limit value or the lower limit value of the numerical range of another step.
- the upper limit value or the lower limit value of the numerical range may be replaced with the value shown in the examples.
- "A or B” may include either A or B, and may include both.
- the materials exemplified in the present specification may be used alone or in combination of two or more.
- the content of each component in the composition is the total amount of the plurality of substances present in the composition when a plurality of substances corresponding to each component are present in the composition, unless otherwise specified. means.
- the reactive hot melt adhesive composition of one embodiment (hereinafter, may be simply referred to as “adhesive composition”) contains a urethane prepolymer.
- the reactive hot-melt adhesive composition is a moisture-curable type, and when it reacts with the moisture in the air or the moisture on the surface of the adherend, the urethane prepolymer is mainly increased in molecular weight. It can develop adhesive strength and the like.
- the urethane prepolymer contains a polymer chain containing a structural unit derived from a polyol including a polyester polyol and a structural unit derived from polyisocyanate, and has an isocyanate group as a terminal group of the polymer chain.
- the polyester polyol contains a predetermined polyester polyol described later. That is, the urethane prepolymer of the present embodiment is a reaction product of a polyol containing a polyester polyol (a predetermined polyester polyol described later) and a polyisocyanate, and has an isocyanate group as a terminal group of the reaction product.
- the adhesive composition of the present embodiment can exhibit excellent adhesive strength after moisture curing, and can form an adhesive layer having high impact resistance. It will be possible.
- the polyol (A) giving a structural unit derived from a polyol includes a polyester polyol (A1) giving a structural unit derived from a polyester polyol.
- the polyol (A) can be composed of a polyester polyol (A1) and a polyol (A2) other than the polyester polyol (A1).
- the polyester polyol (A1) is a polyester polyol having a structural unit derived from an aliphatic dihydric carboxylic acid and a structural unit derived from an aliphatic dihydric alcohol, and is of an aliphatic divalent carboxylic acid and an aliphatic dihydric alcohol.
- each structural unit may be composed of a polyester polyol (A1a) having a tertiary carbon atom or a quaternary carbon atom in at least one molecule and a polyester polyol (A1b) other than the polyester polyol (A1a).
- the content of each structural unit corresponds to the amount of each polyol charged to give each structural unit. That is, the content of each structural unit can be adjusted by adjusting the amount of each polyol charged to give each structural unit.
- polyester polyol (A1) in general will be described first, and then the polyester polyol (A1b) other than the polyester polyol (A1a) and the polyester polyol (A1a) contained in the polyester polyol (A1) will be described.
- the solidification time and viscosity of the adhesive composition can be adjusted.
- the polyester polyol (A1) that gives a structural unit derived from the polyester polyol a compound produced by a polycondensation reaction between a polyhydric alcohol and a polyvalent carboxylic acid can be used.
- the polyester polyol (A1) has, for example, a polyhydric alcohol having 2 to 15 carbon atoms and 2 or 3 hydroxyl groups, and 2 to 14 carbon atoms (including carbon atoms in the carboxy group). It may be a polycondensate with a polyvalent carboxylic acid having 2 to 6 carboxy groups.
- one type may be used alone, or two or more types may be used in combination.
- the polyester polyol (A1) may be a linear polyester diol produced from a dihydric alcohol and a divalent carboxylic acid, or may be a branched polyester triol produced from a trihydric alcohol and a divalent carboxylic acid.
- the branched polyester triol can also be obtained by reacting a dihydric alcohol with a trivalent carboxylic acid.
- polyhydric alcohol examples include ethylene glycol, 1,2-propanediol, 1,3-propanediol, butanediol isomers, pentandiol isomers, hexanediol isomers, and neopentyl glycol ( 2,2-Dimethyl-1,3-propanediol), 3,3-dimethylpentane-1,5-diol, 2-methyl-1,3-propanediol, 3-methyl-1,5-pentanediol, 2 , 4,4-trimethyl-1,6-hexanediol, 2,2,4-trimethyl-1,6-hexanediol, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol and other aliphatic polyhydric alcohols Alternatively, alicyclic polyhydric alcohols; aromatic polyhydric alcohols such as 4,4'-dihydroxydiphenylpropan
- polyvalent carboxylic acid examples include aromatic polyvalent carboxylic acids such as phthalic acid, isophthalic acid, terephthalic acid, and 1,2,4-benzenetricarboxylic acid; maleic acid, fumaric acid, aconitic acid, 1,2,3. -Propanetricarboxylic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, cyclohexane-1,2-dicarboxylic acid, 1,4-cyclohexanediene-1,2-dicarboxylic acid Examples thereof include aliphatic polyvalent carboxylic acids such as acids and alicyclic polyvalent carboxylic acids. The polyvalent carboxylic acid may be used alone or in combination of two or more.
- a polyvalent carboxylic acid derivative such as a carboxylic acid anhydride or a compound in which a part of the carboxy group is esterified can also be used.
- the polyvalent carboxylic acid derivative include dodecylmaleic acid and octadecenylmaleic acid.
- the polyester polyol (A1) may be a crystalline polyester polyol or an amorphous polyester polyol.
- the determination of crystallinity and amorphousness can be made in the state at 25 ° C.
- crystalline polyester polyol means polyester polyol which is crystalline at 25 ° C
- amorphous polyester polyol means polyester polyol which is amorphous at 25 ° C.
- the number average molecular weight (Mn) of the polyester polyol (A1) may be 500 to 12000, 800 to 10000, or 1000 to 9000 from the viewpoint of improving waterproofness and adhesive strength.
- the number average molecular weight is a value measured by gel permeation chromatography (GPC) and converted into standard polystyrene. The GPC measurement can be performed under the following conditions.
- the content of the structural unit derived from the polyester polyol (A1) is 50% by mass or more, 60% by mass or more, and 70 based on the total amount of the structural unit derived from the polyol (A) from the viewpoint of further improving the adhesive strength. It may be 100% by mass or more, or 80% by mass or more, and may be 100% by mass or less, 95% by mass or less, or 90% by mass or less.
- the structural unit derived from the polyol (A) may be composed of a structural unit derived from the polyester polyol (A1).
- the polyester polyol (A1b) is a polyester polyol having a structural unit derived from an aliphatic dihydric carboxylic acid and a structural unit derived from an aliphatic dihydric alcohol, and is of an aliphatic divalent carboxylic acid and an aliphatic dihydric alcohol.
- the two carboxy groups are an aliphatic chain (saturated aliphatic chain (alkylene chain) or unsaturated aliphatic chain (alkenylene chain), preferably saturated aliphatic chain (alkylene chain)).
- the aliphatic dihydric alcohol means a compound linked by, and the two hydroxyl groups are an aliphatic chain (saturated aliphatic chain (alkylene chain) or unsaturated aliphatic chain (alkenylene chain), preferably a saturated aliphatic chain. (Alkylene chain)) means a compound linked by.
- the tertiary carbon atom means a carbon atom bonded to three carbon atoms
- the quaternary carbon atom means a carbon atom bonded to four carbon atoms.
- the tertiary carbon atom or the quaternary carbon atom is present in the aliphatic chain of the aliphatic dihydric carboxylic acid or the aliphatic chain of the aliphatic dihydric alcohol. That is, having a tertiary carbon atom or a quaternary carbon atom in the molecule means having a branched structure in the aliphatic chain and having a side chain. That is, the polyester polyol (A1a) has a branched structure in the aliphatic chain and has a side chain.
- the side chain may be a saturated aliphatic group (alkyl group) or an unsaturated aliphatic group (alkenyl group), and may be a saturated aliphatic group (alkyl group).
- the polyester polyol (A1a) may be a crystalline polyester polyol or an amorphous polyester polyol. As the polyester polyol (A1a), one type may be used alone, or two or more types may be used in combination.
- the aliphatic dihydric alcohol has a tertiary carbon atom or a quaternary carbon atom in the molecule from the viewpoint of easy availability of raw materials. It is preferable to have.
- Examples of the aliphatic divalent carboxylic acid that gives a structural unit derived from the aliphatic divalent carboxylic acid include malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, and sebacic acid. And dimer acid such as linoleic acid can also be mentioned.
- Examples of the aliphatic dihydric alcohol that gives a structural unit derived from the aliphatic dihydric alcohol include ethylene glycol, 1,2-propanediol, 1,3-propanediol, and butanediol isomers (linear structure or).
- examples of the aliphatic dihydric alcohol having a tertiary carbon atom in the molecule include 1,2-propanediol, 1,2-butanediol, 1,3-butanediol, and 1, Examples thereof include 2-pentanediol, 1,3-pentanediol, 1,4-pentanediol, 1,2-hexanediol, 2-methyl-1,3-propanediol, 3-methyl-1,5-pentanediol and the like. Will be.
- examples of the aliphatic dihydric alcohol having a quaternary carbon atom in the molecule include neopentyl glycol (2,2-dimethyl-1,3-propanediol) and 3,3-dimethyl. Examples thereof include pentane-1,5-diol.
- examples of the aliphatic dihydric alcohol having a tertiary carbon atom and a quaternary carbon atom in the molecule include 2,4,4-trimethyl-1,6-hexanediol, 2, Examples thereof include 2,4-trimethyl-1,6-hexanediol.
- Aliphatic dihydric alcohols having a tertiary carbon atom or a quaternary carbon atom in the molecule are easily available as raw materials and are superior in impact resistance. Therefore, an aliphatic alcohol having a tertiary carbon atom in the molecule. It may be a dihydric alcohol or an aliphatic dihydric alcohol having a quaternary carbon atom in the molecule, and may be neopentyl glycol (2,2-dimethyl-1,3-propanediol) or 3-methyl-1,5-. It may be pentandiol.
- the content of the structural unit derived from the polyester polyol (A1a) is more excellent in impact resistance, 5% by mass or more, 10% by mass or more, 20 based on the total amount of the structural unit derived from the polyester polyol (A1). It may be 100% by mass or more, 30% by mass or more, 40% by mass or more, or 50% by mass or more, and may be 100% by mass or less, 97% by mass or less, 95% by mass or less, or 90% by mass or less.
- the polyester polyol (A1) may contain a polyester polyol (A1b) other than the polyester polyol (A1a) in addition to the polyester polyol (A1a).
- a polyester polyol (A1b) As the polyester polyol (A1b), one type may be used alone, or two or more types may be used in combination.
- the content of the structural unit derived from the polyester polyol (A1b) is more excellent in impact resistance, 0% by mass or more and 3% by mass or more and 5 based on the total amount of the structural unit derived from the polyester polyol (A1). It may be 95% by mass or more, 10% by mass or more, and may be 95% by mass or less, 90% by mass or less, 80% by mass or less, 70% by mass or less, 60% by mass or less, or 50% by mass or less.
- the structural unit derived from the polyol (A) is composed of only the structural unit derived from the polyester polyol (A1), the structural unit derived from the polyester polyol (A1a) and the structural unit derived from the polyester polyol (A1b)
- the content may be a content in which the standard of "total amount of structural units derived from polyester polyol (A1)" is replaced with the standard of "total amount of structural units derived from polyol (A)".
- the polyol (A) may contain a polyol (A2) other than the polyester polyol (A1) in addition to the polyester polyol (A1).
- examples of the polyol (A2) include a polyether polyol, a polyether ester polyol, a polyurethane polyol, a polycarbonate polyol, a polyolefin polyol and the like. Such a polyol may be used alone or in combination of two or more.
- the content of the structural unit derived from the polyol (A2) may be 0% by mass or more, 5% by mass or more, or 10% by mass or more, based on the total amount of the structural unit derived from the polyol (A). It may be 0% by mass or less, 40% by mass or less, 30% by mass or less, or 20% by mass or less.
- polyisocyanate (B) The polyisocyanate (B) that gives a structural unit derived from polyisocyanate can be used without particular limitation as long as it is a compound having two or more isocyanate groups.
- the polyisocyanate (B) may be, for example, a compound (diisocyanate) having two isocyanate groups.
- polyisocyanate examples include aromatic isocyanates such as diphenylmethane diisocyanate, dimethyldiphenylmethane diisocyanate, tolylene diisocyanate, xylylene diisocyanate, and p-phenylenedi isocyanate; alicyclic isocyanates such as dicyclohexylmethane diisocyanate and isophorone diisocyanate; hexamethylene diisocyanate and the like.
- aromatic isocyanates such as diphenylmethane diisocyanate, dimethyldiphenylmethane diisocyanate, tolylene diisocyanate, xylylene diisocyanate, and p-phenylenedi isocyanate
- alicyclic isocyanates such as dicyclohexylmethane diisocyanate and isophorone diisocyanate
- hexamethylene diisocyanate and the like The aliphatic is
- the polyisocyanate (B) may contain an aromatic diisocyanate from the viewpoint of reactivity and adhesiveness, and may contain diphenylmethane diisocyanate among the aromatic diisocyanates.
- the polyisocyanate (B) one type may be used alone, or two or more types may be used in combination.
- the urethane prepolymer can be synthesized by reacting the polyol (A) with the polyisocyanate (B). At this time, the polyol contains a polyester polyol (A1a).
- the urethane prepolymer contains a polymerized chain containing a structural unit derived from a polyol and a structural unit derived from polyisocyanate, and has an isocyanate group as a terminal group of the polymerized chain.
- the ratio of the isocyanate group (NCO) equivalent of the polyisocyanate (B) to the hydroxyl group (OH) of the polyol (A) isocyanate group (NCO) equivalent of the polyisocyanate (B) / polyol
- the hydroxyl group (OH) equivalent (NCO / OH) of (A) is larger than 1, and may be 1.3 to 3.0 or 1.5 to 2.0.
- the ratio of NCO / OH is 1.3 or more, the viscosity of the obtained urethane prepolymer is suppressed from becoming too high, and the workability tends to be improved easily.
- the ratio of NCO / OH is 3.0 or less, foaming is less likely to occur during the moisture curing reaction of the adhesive composition, and it tends to be easy to suppress a decrease in adhesive strength.
- the content of the urethane prepolymer may be 70% by mass or more, 80% by mass or more, 90% by mass or more, or 95% by mass or more based on the total amount of the adhesive composition.
- the upper limit of the content of the urethane prepolymer may be 100% by mass based on the total amount of the adhesive composition.
- the adhesive composition may be composed only of urethane prepolymer.
- the adhesive composition may further contain a catalyst from the viewpoint of promoting the curing of the urethane prepolymer and developing higher adhesive strength.
- a catalyst from the viewpoint of promoting the curing of the urethane prepolymer and developing higher adhesive strength.
- the catalyst include dibutyltin dilaurate, dibutyltin dioctate, dimethylcyclohexylamine, dimethylbenzylamine, trioctylamine and the like.
- the adhesive composition may further contain a thermoplastic polymer from the viewpoint of increasing the rubber elasticity of the adhesive layer to be formed and further improving the impact resistance.
- thermoplastic polymer examples include polyurethane, ethylene-based copolymer, propylene-based copolymer, vinyl chloride-based copolymer, acrylic copolymer, styrene-conjugated diene block copolymer and the like.
- the adhesive composition may further contain a tackifier resin from the viewpoint of imparting stronger adhesiveness to the formed adhesive layer.
- a tackifier resin examples include rosin resin, rosin ester resin, hydrogenated rosin ester resin, terpene resin, terpene phenol resin, hydrogenated terpene resin, petroleum resin, hydrogenated petroleum resin, kumaron resin, ketone resin, and styrene resin. Examples thereof include modified styrene resin, xylene resin, and epoxy resin.
- the adhesive composition may contain an appropriate amount of an antioxidant, a pigment, an ultraviolet absorber, a surfactant, a flame retardant, a filler and the like, if necessary.
- the content of the components other than the urethane prepolymer may be 0 to 30% by mass, 0 to 20% by mass, 0 to 10% by mass, or 0 to 5% by mass based on the total amount of the adhesive composition.
- the isocyanate group of the urethane prepolymer contained in the adhesive composition reacts with the moisture in the air or the moisture on the surface of the base material to increase the molecular weight and cure.
- the adhesive composition can be cured, for example, by curing at a temperature of 23 ° C. and a humidity of 50% (relative humidity) for 24 hours or more. By curing under such conditions, a cured product of the adhesive composition can be formed.
- the method for producing the adhesive composition may include a step of reacting the polyol (A) with the polyisocyanate (B) to obtain a urethane prepolymer.
- the reaction temperature of the polyol (A) and the polyisocyanate (B) may be, for example, 85 to 120 ° C.
- decompression defoaming may be performed in the mixing.
- the melt viscosity at 120 ° C. measured using a rotational viscometer of the adhesive composition may be 30 Pa ⁇ s or less, or 25 Pa ⁇ s or less, from the viewpoint of improving coatability.
- the lower limit of the melt viscosity at 120 ° C. is not particularly limited, but may be, for example, 1 Pa ⁇ s or more.
- the melt viscosity of the adhesive composition at 120 ° C. means a value measured by the method described in Examples.
- the adhesive composition of the present embodiment it is possible to form an adhesive layer having high impact resistance. Further, since the adhesive composition of the present embodiment is a solvent-free adhesive, the load on the environment and the human body is small, and the adhesive can be adhered in a short time. Further, since the adhesive composition of the present embodiment is a one-component adhesive, it is easy to handle.
- the adhesive composition of the present embodiment can adhere various adherends via an adhesive layer containing a cured product of the adhesive composition.
- adherend include metal base materials such as SUS and aluminum, and non-metal base materials such as polycarbonate, polyamide, polyetherimide, and glass.
- the adhesive of one embodiment includes a first adherend, a second adherend, and an adhesive layer that adheres the first adherend and the second adherend to each other.
- the adhesive layer contains a cured product of the above reactive hot melt adhesive composition.
- Examples of the adhesive body of the present embodiment include semiconductor devices, non-sewn clothing, electronic devices, and the like.
- the first adherend and the second adherend may be the same as those exemplified in the above-mentioned adherend.
- the adhesive of the present embodiment has a step of melting the above-mentioned reactive hot melt adhesive composition and applying it to a first adherend to form an adhesive layer, and a second coating on the adhesive layer. It can be produced by a method including a step of arranging an adherend and crimping a second adherend to obtain an adhesive precursor, and a step of curing an adhesive layer in the adhesive precursor.
- the temperature at which the adhesive composition is melted may be, for example, 80 to 180 ° C.
- the method of applying the adhesive composition to the first adherend is not particularly limited, and a known method can be appropriately applied.
- a method of crimping the second adherend for example, a method of crimping using a pressure roll or the like can be mentioned.
- the conditions for curing the adhesive layer in the adhesive precursor may be the same as the curing conditions for the adhesive composition described above.
- Examples 1 to 5 and Comparative Examples 1 to 3 The pre-dehydrated polyol (A) was added to the reaction vessel in the blending amount shown in Table 1 and mixed uniformly. Then, polyisocyanate (B) was further added to the reaction vessel in the blending amount shown in Table 1, mixed uniformly, and reacted at 110 ° C. for 1 hour. Further, by defoaming and stirring under reduced pressure at 110 ° C. for 1 hour, the adhesive compositions of Examples 1 to 5 and Comparative Examples 1 to 3 containing a urethane prepolymer having an isocyanate group were obtained.
- the unit of the blending amount in Table 1 is a mass part.
- A1a-1 An amorphous polyester polyol (atypical polyester polyol) which is a reaction product of adipic acid (aliphatic dihydric carboxylic acid) and neopentyl glycol (aliphatic dihydric alcohol having a quaternary carbon atom in the molecule).
- A1a-2 An amorphous polyester polyol (atypical polyester polyol) which is a reaction product of adipic acid (aliphatic dihydric carboxylic acid) and neopentyl glycol (aliphatic dihydric alcohol having a quaternary carbon atom in the molecule).
- Number of hydroxyl groups: 2, Mn: 5000 A crystalline polyester polyol (number of hydroxyl groups: 2, Mn: 5000) which is a reaction product of sebacic acid (aliphatic dihydric carboxylic acid) and 1,6-hexanediol (aliphatic dihydric alcohol).
- a crystalline polyester polyol (number of hydroxyl groups: 2, Mn: 5000) which is a reaction product of adipic acid (aliphatic dihydric carboxylic acid) and 1,6-hexanediol (aliphatic dihydric alcohol).
- A1b-3) An amorphous polyester polyol (number of hydroxyl groups:) which is a reaction product of isophthalic acid (aromatic carboxylic acid) and neopentyl glycol (aliphatic dihydric alcohol having a quaternary carbon atom in the molecule). 2, Mn: 2000)
- melt viscosity A TVB-25H viscometer (manufactured by Toki Sangyo Co., Ltd.) was used to measure the melt viscosity of the adhesive composition (sample amount: 15 g) at a rotor rotation speed of 50 rpm and 120 ° C. using a No. 4 rotor.
- the adhesive composition was melted at 100 ° C. to form a film with a thickness of 0.15 mm.
- the obtained film was allowed to stand at 23 ° C. and 50% humidity (relative humidity) for 24 hours to be cured to obtain a cured product of the film.
- the impact absorption was evaluated using a digital accelerometer 1340A-01H (manufactured by Showa Sokki Co., Ltd.). A drop jig was fixed on the cured product of the film, the falling body was dropped from above the cured product of the film, and the impact acceleration of the falling body was measured.
- the drop height of the falling body was set at a position where the impact acceleration in the absence of the cured film was 2000 m / s 2 (200 ⁇ 10 m / s 2 ). It can be said that the smaller the value of the impact acceleration, the more the cured product of the film absorbs the impact, so that it can be said that the impact absorption is excellent.
- the numerical value of the impact acceleration of the reactive hot melt adhesive composition of Examples 1 to 5 is smaller than the numerical value of the impact acceleration of the reactive hot melt adhesive composition of Comparative Examples 1 to 3. rice field. From these results, it was confirmed that the reactive hot melt adhesive composition of the present invention can form an adhesive layer having high impact resistance.
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Abstract
Description
一実施形態の反応性ホットメルト接着剤組成物(以下、単に「接着剤組成物」という場合もある。)は、ウレタンプレポリマーを含有する。なお、一般的に、反応性ホットメルト接着剤組成物とは、湿気硬化型であり、空気中の水分又は被着体表面の水分と反応することによって、主にウレタンプレポリマーが高分子量化し、接着強度等を発現し得るものである。
(ポリオール(A))
ポリオールに由来する構造単位を与えるポリオール(A)は、ポリエステルポリオールに由来する構造単位を与えるポリエステルポリオール(A1)を含む。ポリオール(A)は、ポリエステルポリオール(A1)とポリエステルポリオール(A1)以外のポリオール(A2)とから構成され得る。ポリエステルポリオール(A1)は、脂肪族二価カルボン酸に由来する構造単位及び脂肪族二価アルコールに由来する構造単位を有するポリエステルポリオールであって、脂肪族二価カルボン酸及び脂肪族二価アルコールの少なくとも一方の分子内に、第3級炭素原子又は第4級炭素原子を有するポリエステルポリオール(A1a)とポリエステルポリオール(A1a)以外のポリエステルポリオール(A1b)とから構成され得る。なお、各構造単位の含有量は、それぞれの構造単位を与える各ポリオールの仕込み量に対応する。すなわち、各構造単位の含有量の調整は、各構造単位を与える各ポリオールの仕込み量の調整によって行うことができる。
カラム:「Gelpack GLA130-S」、「Gelpack GLA150-S」及び「Gelpack GLA160-S」(日立化成株式会社製、HPLC用充填カラム)
溶離液:テトラヒドロフラン
流量:1.0mL/分
カラム温度:40℃
検出器:RI
ポリイソシアネートに由来する構造単位を与えるポリイソシアネート(B)は、イソシアネート基を2個以上有する化合物であれば、特に制限なく用いることができる。ポリイソシアネート(B)は、例えば、イソシアネート基を2個有する化合物(ジイソシアネート)であってもよい。ポリイソシアネートとしては、例えば、ジフェニルメタンジイソシアネート、ジメチルジフェニルメタンジイソシアネート、トリレンジイソシアネート、キシリレンジイソシアネート、p-フェニレンジイソシアネート等の芳香族イソシアネート;ジシクロヘキシルメタンジイソシアネート、イソフォロンジイソシアネート等の脂環族イソシアネート;ヘキサメチレンジイソシアネート等の脂肪族イソシアネートなどが挙げられる。ポリイソシアネート(B)は、反応性及び接着性の観点から、芳香族ジイソシアネートを含んでいてもよく、芳香族ジイソシアネートの中でも、ジフェニルメタンジイソシアネートを含んでいてもよい。ポリイソシアネート(B)は、1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。
一実施形態の接着体は、第1の被着体と、第2の被着体と、第1の被着体及び第2の被着体を互いに接着する接着剤層とを備える。接着剤層は、上記の反応性ホットメルト接着剤組成物の硬化物を含有する。本実施形態の接着体としては、例えば、半導体装置、無縫製衣類、電子機器等が挙げられる。
あらかじめ脱水処理したポリオール(A)を表1に示す配合量で反応容器に加え、均一に混合した。次いで、ポリイソシアネート(B)を表1に示す配合量で反応容器にさらに加えて均一に混合し、110℃で1時間反応させた。さらに110℃で1時間減圧脱泡撹拌することによって、イソシアネート基を有するウレタンプレポリマーを含有する、実施例1~5及び比較例1~3の接着剤組成物を得た。なお、表1における配合量の単位は、質量部である。
・ポリエステルポリオール(A1)
(A1a-1):アジピン酸(脂肪族二価カルボン酸)とネオペンチルグリコール(分子内に第4級炭素原子を有する脂肪族二価アルコール)との反応生成物である非晶性ポリエステルポリオール(水酸基数:2、Mn:2000)
(A1a-2):アジピン酸(脂肪族二価カルボン酸)とネオペンチルグリコール(分子内に第4級炭素原子を有する脂肪族二価アルコール)との反応生成物である非晶性ポリエステルポリオール(水酸基数:2、Mn:5000)
(A1b-1):セバシン酸(脂肪族二価カルボン酸)及び1,6-ヘキサンジオール(脂肪族二価アルコール)の反応生成物である結晶性ポリエステルポリオール(水酸基数:2、Mn:5000)
(A1b-2):アジピン酸(脂肪族二価カルボン酸)及び1,6-ヘキサンジオール(脂肪族二価アルコール)の反応生成物である結晶性ポリエステルポリオール(水酸基数:2、Mn:5000)
(A1b-3):イソフタル酸(芳香族カルボン酸)及びネオペンチルグリコール(分子内に第4級炭素原子を有する脂肪族二価アルコール)の反応生成物である非晶性ポリエステルポリオール(水酸基数:2、Mn:2000)
(B-1):ジフェニルメタンジイソシアネート(イソシアネート基数:2)
TVB-25H形粘度計(東機産業株式会社製)で、4号ローターを使用して、ローター回転数50rpm、120℃における接着剤組成物(試料量:15g)の溶融粘度を測定した。
接着剤組成物を100℃で溶融させ、厚さ0.15mmのフィルムを形成した。得られたフィルムを、23℃、湿度50%(相対湿度)下にて24時間静置して硬化させ、フィルムの硬化物を得た。衝撃吸収性の評価は、デジタル加速度計1340A-01H(昭和測器株式会社製)を用いて行った。フィルムの硬化物上に落下治具を固定し、フィルムの硬化物の上方から落下体を落下させ、落下体の衝撃加速度を測定した。落下体の落下高さは、フィルムの硬化物がない状態での衝撃加速度が2000m/s2(200×10m/s2)となる位置を設定した。衝撃加速度の数値が小さいほど、フィルムの硬化物が衝撃を吸収しているといえるので、衝撃吸収性に優れるといえる。
Claims (4)
- ポリエステルポリオールを含むポリオールに由来する構造単位及びポリイソシアネートに由来する構造単位を有する重合鎖を含み、前記重合鎖の末端基としてイソシアネート基を有する、ウレタンプレポリマーを含有し、
前記ポリエステルポリオールが、脂肪族二価カルボン酸に由来する構造単位及び脂肪族二価アルコールに由来する構造単位を有するポリエステルポリオールであって、前記脂肪族二価カルボン酸及び前記脂肪族二価アルコールの少なくとも一方の分子内に、第3級炭素原子又は第4級炭素原子を有するポリエステルポリオールを含む、
反応性ホットメルト接着剤組成物。 - 前記脂肪族二価アルコールが、分子内に第3級炭素原子又は第4級炭素原子を有する、
請求項1に記載の反応性ホットメルト接着剤組成物。 - 第1の被着体と、
第2の被着体と、
前記第1の被着体及び前記第2の被着体を互いに接着する接着剤層と、
を備え、
前記接着剤層が、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の硬化物を含有する、
接着体。 - 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を溶融させ、第1の被着体に塗布して接着剤層を形成する工程と、
前記接着剤層上に第2の被着体を配置し、前記第2の被着体を圧着することによって接着体前駆体を得る工程と、
前記接着体前駆体における前記接着剤層を硬化させる工程と、
を備える、
接着体の製造方法。
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JP2002188073A (ja) * | 2000-05-02 | 2002-07-05 | Ube Ind Ltd | 溶融接着剤 |
JP2007091996A (ja) * | 2005-09-30 | 2007-04-12 | Dainippon Ink & Chem Inc | 湿気硬化型ポリウレタンホットメルト接着剤 |
JP2018016703A (ja) * | 2016-07-27 | 2018-02-01 | 日立化成株式会社 | 湿気硬化型ホットメルト接着剤及びその製造方法 |
WO2019082434A1 (ja) * | 2017-10-27 | 2019-05-02 | 太陽精機株式会社 | 熱可逆性架橋型ホットメルト接着剤 |
JP2020196801A (ja) * | 2019-05-31 | 2020-12-10 | 昭和電工マテリアルズ株式会社 | 反応性ホットメルト接着剤、並びに接着体及びその製造方法 |
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US4820368A (en) | 1987-05-07 | 1989-04-11 | H. B. Fuller Company | Thermally stable reactive hot melt urethane adhesive composition having a thermoplastic polymer, a compatible, curing urethane polyalkylene polyol prepolymer and a tackifying agent |
JPH06122860A (ja) | 1992-10-12 | 1994-05-06 | Sekisui Chem Co Ltd | 反応性ホットメルト接着剤組成物 |
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JP2002188073A (ja) * | 2000-05-02 | 2002-07-05 | Ube Ind Ltd | 溶融接着剤 |
JP2007091996A (ja) * | 2005-09-30 | 2007-04-12 | Dainippon Ink & Chem Inc | 湿気硬化型ポリウレタンホットメルト接着剤 |
JP2018016703A (ja) * | 2016-07-27 | 2018-02-01 | 日立化成株式会社 | 湿気硬化型ホットメルト接着剤及びその製造方法 |
WO2019082434A1 (ja) * | 2017-10-27 | 2019-05-02 | 太陽精機株式会社 | 熱可逆性架橋型ホットメルト接着剤 |
JP2020196801A (ja) * | 2019-05-31 | 2020-12-10 | 昭和電工マテリアルズ株式会社 | 反応性ホットメルト接着剤、並びに接着体及びその製造方法 |
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