JP2014201635A - Moisture-curable urethane hot melt resin composition and molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a moisture-curable urethane hot melt resin composition excellent in internal curability, demoldability and moldability.SOLUTION: There is provided a moisture-curable urethane hot melt resin composition containing an urethane prepolymer (i) having an isocyanate group obtained by reacting (A) polyol containing polytetramethylene glycol (A-1), polyether triol (A-2), polyether polyol (A-3) obtained from ethylene oxide and propylene oxide and crystalline polyester polyol (A-4), and polyisocyanate (B), a silane coupling agent (ii) and a tertiary amine compound (iii), and there is also provided a molded article using the same.

Description

  The present invention is to provide a moisture-curing urethane hot melt resin composition and a molded product that are excellent in internal curability, demoldability, and moldability.

  The demand for molded articles (hot melt molding) using a hot-melt resin composition is increasing in applications for sealing and protecting bases of electrical appliances such as personal computers and portable terminals. At present, thermoplastic resins such as polyester resins and polyamide resins are used for hot melt molding (see, for example, Patent Document 1). However, since the thermoplastic resin has a high melting point and a high viscosity, there are problems such as poor filling of mold details and low heat resistance.

  Therefore, studies have been made on using a moisture-curable urethane hot melt resin composition instead of the thermoplastic resin. Examples of hot melt molding using the moisture-curable urethane hot melt resin composition include, for example, polyol (A) and polyisocyanate (B) in the presence of an aromatic phosphonic acid metal salt (C) as a crystal nucleating agent. It is a moisture curable hot melt urethane resin composition containing an isocyanate group-terminated urethane prepolymer obtained by reacting with the above, in 100 parts by mass of the polyol (A), 50 to 90 parts by mass of the aliphatic polyester polyol (a1) and Hot melt molding using a moisture-curable hot melt urethane resin composition containing 10 to 50 parts by mass of an aromatic polyester polyol (a2) is disclosed (for example, see Patent Document 2). .

  The hot melt molding has a high hardness appearance and a high demolding speed after molding a molded product, and therefore has excellent moldability. However, when the moisture-curable hot-melt urethane resin composition is made thick, there are problems such as poor internal curability and cracking when the molded product is demolded. It was.

JP 2013-21931 A JP 2012-177016 A

  The problem to be solved by the present invention is to provide a moisture curable urethane hot melt resin composition having excellent internal curability, demoldability and moldability.

  As the inventors of the present invention have been researching to solve the above-mentioned problems, they have focused on polyols and additives used for urethane prepolymers, and have earnestly studied to complete the present invention.

  That is, the present invention relates to polytetramethylene glycol (A-1), polyether triol (A-2), polyether polyol (A-3) obtained from ethylene oxide and propylene oxide, and crystalline polyester polyol (A- 4) A urethane prepolymer (i) having an isocyanate group obtained by reacting a polyol (A) containing polyisocyanate (B) with a silane coupling agent (ii) and a tertiary amine compound (iii). The present invention provides a moisture curable urethane hot melt resin composition characterized by the above, and a molded article obtained using the same.

The moisture curable urethane hot melt resin composition of the present invention is excellent in internal curability, demoldability and moldability.
Therefore, the moisture curable urethane hot melt resin composition of the present invention can be suitably used as hot melt molding, and particularly preferably used for sealing and protecting the base of electrical appliances such as personal computers and portable terminals. it can.

  The moisture curable urethane hot melt resin composition of the present invention comprises a polytetramethylene glycol (A-1), a polyether triol (A-2), a polyether polyol (A-3) obtained from ethylene oxide and propylene oxide. (Hereinafter abbreviated as “polyether polyol (A-3)”) and an isocyanate group obtained by reacting a polyol (A) containing a crystalline polyester polyol (A-4) with a polyisocyanate (B). It contains a urethane prepolymer (i), a silane coupling agent (ii) and a tertiary amine compound (iii).

  The polytetramethylene glycol (A-1) is an essential component for imparting excellent demoldability, moldability, and the like. For example, polytetramethylene glycol obtained by ring-opening polymerization of tetrahydrofuran, tetrahydrofuran and Modified polytetramethylene glycol copolymerized with alkyl-substituted tetrahydrofuran, modified polytetramethylene glycol copolymerized with neopentyl glycol and tetrahydrofuran, and the like can be used. Further, the number of functional groups of the polytetramethylene glycol (A-1) is preferably in the range of 1.5 to 2.5 from the viewpoint of demoldability, moldability, viscosity, and the like.

  The number average molecular weight of the polytetramethylene glycol (A-1) is preferably in the range of 500 to 5,000, and preferably 1,000 to 3 from the viewpoint of further improving mold release and moldability. The range of 1,000 is more preferred. In addition, the number average molecular weight of the said polytetramethylene glycol (A-1) shows the value measured on condition of the following by gel permeation chromatography (GPC) method.

Measuring device: High-speed GPC device (“HLC-8220GPC” manufactured by Tosoh Corporation)
Column: The following columns manufactured by Tosoh Corporation were connected in series.
"TSKgel G5000" (7.8 mm ID x 30 cm) x 1 "TSKgel G4000" (7.8 mm ID x 30 cm) x 1 "TSKgel G3000" (7.8 mm ID x 30 cm) x 1 “TSKgel G2000” (7.8 mm ID × 30 cm) × 1 detector: RI (differential refractometer)
Column temperature: 40 ° C
Eluent: Tetrahydrofuran (THF)
Flow rate: 1.0 mL / min Injection amount: 100 μL (tetrahydrofuran solution with a sample concentration of 0.4 mass%)
Standard sample: A calibration curve was prepared using the following standard polystyrene.

(Standard polystyrene)
"TSKgel standard polystyrene A-500" manufactured by Tosoh Corporation
"TSKgel standard polystyrene A-1000" manufactured by Tosoh Corporation
"TSKgel standard polystyrene A-2500" manufactured by Tosoh Corporation
"TSKgel standard polystyrene A-5000" manufactured by Tosoh Corporation
"TSKgel standard polystyrene F-1" manufactured by Tosoh Corporation
"TSKgel standard polystyrene F-2" manufactured by Tosoh Corporation
"TSKgel standard polystyrene F-4" manufactured by Tosoh Corporation
"TSKgel standard polystyrene F-10" manufactured by Tosoh Corporation
"TSKgel standard polystyrene F-20" manufactured by Tosoh Corporation
"TSKgel standard polystyrene F-40" manufactured by Tosoh Corporation
"TSKgel standard polystyrene F-80" manufactured by Tosoh Corporation
"TSKgel standard polystyrene F-128" manufactured by Tosoh Corporation
"TSKgel standard polystyrene F-288" manufactured by Tosoh Corporation
"TSKgel standard polystyrene F-550" manufactured by Tosoh Corporation

  The polyether triol (A-2) is an essential component for imparting excellent moldability, heat resistance, and internal curability. For example, polyethylene triol, polypropylene triol, polybutylene triol, and the like can be used. . These polyether triols may be used alone or in combination of two or more. As said polyether triol (A-2), it is preferable to use a polypropylene triol from a viewpoint which can improve a moldability, heat resistance, etc. further. In addition, when other than trifunctional is used as said polyether triol (A-2), desired moldability and heat resistance cannot be obtained.

  The number average molecular weight of the polyether triol (A-2) is preferably in the range of 1,000 to 5,000 from the viewpoint of further improving moldability, heat resistance, internal curability, and the like. The range of 4,000 to 4,000 is more preferable. In addition, the number average molecular weight of the said polyether triol (A-2) shows the value obtained similarly to the number average molecular weight of the said polytetramethylene glycol (A-1).

  As a usage-amount of the said polyether triol (A-2), from a viewpoint which can improve a moldability, heat resistance, internal curability, etc. further, with respect to 100 mass parts of said polytetramethylene glycol (A-1), It is preferable that it is the range of 30-300 mass parts, and the range of 50-200 mass parts is more preferable.

  The polyether polyol (A-3) is an essential component for imparting excellent internal curability, and is a polyether polyol obtained by polymerizing ethylene oxide and propylene oxide by a known method. The number of functional groups of the polyether polyol (A-3) is preferably in the range of 1.5 to 2.5.

  The reaction molar ratio [EO / PO] of the ethylene oxide and the propylene oxide is preferably in the range of 3/97 to 90/10 from the viewpoint of further improving the internal curability. A range of 85/15 is more preferred.

  The number average molecular weight of the polyether polyol (A-3) is preferably in the range of 500 to 5,000, more preferably in the range of 1,000 to 3,000, from the viewpoint of further improving the internal curability. More preferred. In addition, the number average molecular weight of the said polyether polyol (A-3) shows the value obtained similarly to the number average molecular weight of the said polytetramethylene glycol (A-1).

  As the polyether polyol (A-3), “ED-36”, “ED-56” (manufactured by Mitsui Takeda Chemical Co., Ltd.) and the like can be obtained as commercial products.

  As a usage-amount of the said polyether polyol (A-3), the range which is 20-300 mass parts with respect to 100 mass parts of said polytetramethylene glycol (A-1) from a viewpoint which can improve internal curability further. It is preferable that the range of 30-200 mass parts is more preferable.

  In addition, as the total content of the polytetramethylene glycol (A-1), the polyether triol (A-2), and the polyether polyol (A-3), from the viewpoint of further improving the demoldability, It is preferable that it is 25 mass% or less in a polyol (A) whole quantity, and it is more preferable that it is the range of 10-22 mass%.

  The crystalline polyester polyol (A-4) is an essential component for imparting excellent demoldability. For example, a reaction product of a compound having a hydroxyl group and a polybasic acid can be used. In the present invention, “crystallinity” means that the peak of crystallization heat or heat of fusion can be confirmed in DSC (differential scanning calorimeter) measurement in accordance with JIS K 7121. Indicates that the peak cannot be confirmed.

  Examples of the compound having a hydroxyl group include ethylene glycol, propylene glycol, butanediol, pentanediol, hexanediol, heptanediol, octanediol, nonanediol, decanediol, trimethylolpropane, trimethylolethane, and glycerin. Can do. These compounds may be used alone or in combination of two or more. Among these, it is preferable to use butanediol, hexanediol, octanediol, and decanediol from the viewpoint of improving crystallinity and further improving demoldability.

  Examples of the polybasic acid include oxalic acid, malonic acid, succinic acid, adipic acid, sebacic acid, azelaic acid, 1,12-dodecanedicarboxylic acid, and the like.

  The number average molecular weight of the crystalline polyester polyol (A-4) is preferably in the range of 500 to 5,000, more preferably in the range of 2,000 to 4,000, from the viewpoint of further improving demoldability. . In addition, the number average molecular weight of the said crystalline polyester polyol (A-4) shows the value obtained by measuring similarly to the number average molecular weight of the said polytetramethylene glycol (A-1).

  Moreover, as a glass transition temperature (Tg) of the said crystalline polyester polyol (A-4), the range of 40-130 degreeC is preferable from a viewpoint which can improve a demolding property further. The glass transition temperature of the crystalline polyester polyol (A-4) is a value measured by DSC in accordance with JIS K 7121-1987. Specifically, the glass transition temperature in the differential scanning calorimeter is ( A-4) was added, the temperature was raised to (Tg + 50 ° C.) at a heating rate of 10 ° C./min, held for 3 minutes, and then rapidly cooled, and the intermediate glass transition temperature (Tmg) read from the obtained differential heat curve. ).

  The amount of the crystalline polyester polyol (A-4) used is preferably in the range of 40 to 90% by mass in the total amount of the polyol (A) from the viewpoint of further improving demoldability. The range of mass% is more preferable, and the range of 50 to 75 mass% is still more preferable.

  The polyol (A) is essential for the polytetramethylene glycol (A-1), the polyether triol (A-2), the polyether polyol (A-3), and the crystalline polyester polyol (A-4). However, it may contain other polyols as necessary.

  Examples of the other polyols include aromatic polyester polyols, amorphous polyester polyols, and polycarbonate polyols. Among these, it is preferable to contain an aromatic polyester polyol from the viewpoint of further improving the heat resistance of the molded product.

  As the aromatic polyester polyol, for example, a reaction product of a compound having a hydroxyl group and a dibasic acid containing an aromatic polybasic acid can be used.

  As the compound having a hydroxyl group, the same compounds as those used in the crystalline polyester polyol (A-4) can be used.

  Examples of the aromatic polybasic acid include phthalic acid, isophthalic acid, terephthalic acid, orthophthalic acid, hexahydroisophthalic acid, and the like. As other dibasic acids, those similar to those used in the crystalline polyester polyol (A-4) can be used.

  The number average molecular weight of the aromatic polyester polyol is preferably in the range of 500 to 5,000, more preferably in the range of 2,000 to 4,000, from the viewpoint of further improving the heat resistance of the molded product. Is more preferable. In addition, the number average molecular weight of the said aromatic polyester polyol shows the value obtained by measuring similarly to the number average molecular weight of the said polytetramethylene glycol (A-1).

  The amount used in the case of using the aromatic polyester polyol is preferably in the range of 3 to 30% by mass based on the total amount of the polyol (A), from the viewpoint of further improving the heat resistance of the molded product. A range of mass% is more preferred.

  Examples of the polyisocyanate (B) include polymethylene polyphenyl polyisocyanate, diphenylmethane diisocyanate, polymeric diphenylmethane diisocyanate, carbodiimide-modified diphenylmethane diisocyanate isocyanate, phenylene diisocyanate, tolylene diisocyanate, naphthalene diisocyanate, and other aromatic polyisocyanates, hexamethylene diisocyanate. Aliphatic or alicyclic polyisocyanates such as lysine diisocyanate, cyclohexane diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, xylylene diisocyanate, and tetramethylxylylene diisocyanate can be used. These polyisocyanates may be used alone or in combination of two or more. Among these, it is preferable to use diphenylmethane diisocyanate and polymeric diphenylmethane diisocyanate from the viewpoint of reactivity, substrate adhesion, and the like.

  The urethane prepolymer (i) having an isocyanate group is obtained by reacting the polyol (A) and the polyisocyanate (B). It has an isocyanate group that can react with moisture present in the adherend to form a crosslinked structure at the polymer terminal or in the molecule.

  As a manufacturing method of the said urethane prepolymer (i), it heats, after dripping the mixture of the said polyol (A) to the reaction container containing the said polyisocyanate (B), and has the said polyisocyanate (B), for example. It can manufacture by making it react on the conditions from which an isocyanate group becomes excess with respect to the hydroxyl group which the said polyol (A) has.

  When producing the urethane prepolymer (i), the equivalent ratio of the isocyanate group of the polyisocyanate (B) to the hydroxyl group of the polyol (A) ([isocyanate group / hydroxyl group]) From the viewpoint of further improving internal curability and the like, a range of 1.1 to 5.0 is preferable, and a range of 1.5 to 3.0 is more preferable.

  The urethane prepolymer (i) can be usually produced without a solvent, but may be produced by reacting the polyol (A) and the polyisocyanate (B) in an organic solvent. When reacting in an organic solvent, an organic solvent such as ethyl acetate, n-butyl acetate, methyl ethyl ketone, and toluene that does not hinder the reaction can be used, but by a method such as heating under reduced pressure during or after the reaction. It is necessary to remove the organic solvent.

  As an isocyanate group content rate (henceforth, NCO%) of the urethane prepolymer (i) obtained by the above method, it is 1.5-8.0 from a viewpoint which can improve a demolding property, internal curability, etc. further. % Is preferable, a range of 1.7 to 5.0% is more preferable, and a range of 1.8 to 3.0% is particularly preferable. In addition, NCO% of the said urethane prepolymer (i) shows the value measured by the potentiometric titration method based on JISK1603-1.

  As the viscosity of the urethane prepolymer (i), the melt viscosity at 120 ° C. is preferably in the range of 1,000 to 50,000 mPa · s from the viewpoint of further improving demoldability and internal curability. More preferably, it is in the range of 2,000 to 10,000 mPa · s. The melt viscosity at 120 ° C. is a value measured with a cone plate viscometer (manufactured by ICI).

  The softening point of the urethane prepolymer (i) is preferably in the range of 30 to 120 ° C. from the viewpoint of further improving moldability. In addition, the said softening point means the temperature which begins to heat-flow and loses cohesive force, when the temperature of urethane prepolymer (i) is raised in steps. Further, the softening point of the urethane prepolymer indicates a value obtained by a ring and ball method in accordance with JIS K 5902.

  The silane coupling agent (ii) is an essential component for imparting excellent internal curability and substrate adhesion. For example, 2- (3,4-epoxycyclohexyl) ethyltriethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 2- (3,4-epoxycyclohexyl) ethylmethyldimethoxysilane, 2- (3,4-epoxycyclohexyl) ethylmethyldiethoxysilane, 2- (3,4 -Epoxycyclohexyl) propyltrimethoxysilane, 2- (3,4-epoxycyclohexyl) propylmethyldimethoxysilane, 2- (3,4-epoxycyclohexyl) propyltriethoxysilane, 2- (3,4-epoxycyclohexyl) propyl Methyldiethoxysilane 3-glycidoxypropyltri Silane coupling agents having an epoxy group such as toxisilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropylmethyldimethoxysilane; γ-mercaptopropyltrimethoxysilane Silane coupling agents having a mercapto group such as: vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (βmethoxyethoxy) silane, γ-methacryloxypropylmethyldimethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacrylic A silane coupling agent having a vinyl group such as loxypropylmethyldiethoxysilane and γ-methacryloxypropyltriethoxylane can be used. These silane coupling agents may be used alone or in combination of two or more.

  Among these, it is preferable to use a silane coupling agent having an epoxy group or a silane coupling agent having a mercapto group from the viewpoint of further improving internal curability and substrate adhesion. Epoxycyclohexyl) ethyltriethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, γ-mercaptopropyltrimethoxysilane It is more preferable to use

  As a usage-amount of the said silane coupling agent (ii), it is 0.05-2 mass with respect to 100 mass parts of said urethane prepolymer (i) from a viewpoint which can improve internal curability and base-material adhesiveness further. The range of parts is preferred.

  The tertiary amine compound (iii) is an essential component for imparting excellent internal curability. When a primary or secondary amine compound is used in place of the tertiary amine compound (iii), there is a problem that the moisture-curable urethane hot melt resin composition is thickened when melted.

  Examples of the tertiary amine compound (iii) include fats such as triethylamine, N, N-dimethylcyclohexylamine, pentamethyldiethylenetriamine, and bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate. Aromatic tertiary amine compounds, pyridine, methylpyridine, benzyldimethylamine, N-methylpiperidine, N, N′-endoethylenepiperazine, N, N′-dimethylpiperazine, dimethylaniline, dimethylparatoluidine, etc. A compound or the like can be used. These tertiary amine compounds may be used alone or in combination of two or more. Among these, it is preferable to use an aliphatic tertiary amine compound from the viewpoint of further improving the internal curability.

  As a usage-amount of the said tertiary amine compound (iii), it is the range of 0.05-2 mass parts with respect to 100 mass parts of said urethane prepolymer (i) from a viewpoint which can improve internal curability further. It is preferable.

  The moisture curable urethane hot melt resin composition of the present invention may be composed of only the urethane prepolymer (i), the silane coupling agent (ii), and the tertiary amine compound (iii), but is necessary. Depending on the case, other additives may be contained.

  Examples of the other additives include an antioxidant, a tackifier, a plasticizer, a stabilizer, a filler, a dye, a pigment, a fluorescent brightening agent, a silane coupling agent, a wax, and a thermoplastic resin. Can do.

  Next, a method for obtaining a molded product using the moisture curable urethane hot melt resin composition of the present invention will be described.

  The processing temperature of the moisture-curable urethane hot melt resin composition of the present invention is at least the melting point of the resin composition, preferably in the range of 80 to 130 ° C, more preferably in the range of 100 to 120 ° C. In the case where the processing temperature is lower than the melting point, it is not preferable because problems occur in the molding operation or the working efficiency is lowered. On the other hand, when the processing temperature is excessively high, the resin composition may be altered, decomposed or gelled by high heat, which is not preferable.

  In addition, when the moisture curable urethane hot melt resin composition of the present invention is used for molding, the processing method may be, for example, an injection molding machine, an extrusion molding machine, or an applicator. Good.

  As an example of the molding process, in the case of an injection molding method, the resin composition is melted at a temperature equal to or higher than the melting point, and the melt is injected into a closed mold while being pressed in a flowable state. A molded article that is accelerated in crystallization and cooled and solidified in a short time is taken out (demolded) from the mold, and then cured by moisture (water). In addition, it is also possible to insert a part before molding as a bonding or sealing member into the sealing mold.

  The moisture (water) in this case may be moisture that is forcibly supplied by appropriate means such as spraying or dipping, for example, even if it is moisture present in the atmosphere.

  If parts are set in advance in the mold and the moisture-curing urethane hot melt resin composition of the present invention is poured into the mold in a flowable state, the molding time is extremely short compared to conventional molding results. Thus, the solidification of the crystal is completed, and a molded product (that is, hot melt molding) in which the component and the resin composition are firmly bonded can be obtained, which has a great effect on the significant improvement in productivity.

  Hereinafter, the present invention will be described in detail with reference to examples.

[Example 1]
In a four-necked flask equipped with a thermometer, stirrer, inert gas inlet and reflux condenser, 7 parts by mass of polytetramethylene glycol (number average molecular weight 2,000), polypropylene triol (number average molecular weight 3,000) 7 4 parts by mass, polyether polyol-1 (reacted ethylene oxide and propylene oxide in a molar ratio of 8:92, number average molecular weight 2,000), 4 parts by mass, crystalline polyester polyol-1 (1,6-hexane) Prepared by reacting diol with 1,12-dodecanedicarboxylic acid, number average molecular weight 2,000, functional group number 2) 71 parts by mass, and dehydrated under reduced pressure condition until water content is 0.05% by mass or less did.
Subsequently, after cooling to 70 ° C. in the container, 12 parts by mass of 4,4′-diphenylmethane diisocyanate (hereinafter abbreviated as “MDI”) is added, the temperature is raised to 100 ° C., and 3-glycidoxypropyltri Add 0.2 part by weight of methoxysilane and 1 part by weight of bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate and react for about 3 hours until the isocyanate group content becomes constant, A moisture curable urethane hot melt resin composition containing a urethane prepolymer having an isocyanate group was obtained.

[Examples 2-6, Comparative Examples 1-5]
A moisture-curable urethane hot melt resin composition was obtained in the same manner as in Example 1 except that the raw materials used were changed as shown in Tables 1 and 2.

[Method for evaluating formability]
The moisture-curable urethane hot melt resin compositions obtained in Examples and Comparative Examples were melted by heating to 110 ° C., and 6 g of a 23 ° C. aluminum mold (diameter 50 mm × 3 ^t mm closed type) was injected. The JISA hardness of the surface of the molded article 30 seconds after was measured from the time of injection as a base point. In addition, the JISA hardness measurement was based on JISK6253.
When the JISA hardness is 20 or more, the mold has a desired hardness after 30 seconds from the injection of the resin composition, so that the mold release speed can be increased and the moldability is good. It is shown that. Therefore, in such a case, it was evaluated as “◯”.
Moreover, when the said JISA hardness was less than 20, it evaluated as "x".

[Method for evaluating demoldability]
The moisture curable urethane hot melt resin compositions obtained in Examples and Comparative Examples were heated and melted to 110 ° C., and poured into a 23 ° C. aluminum mold (length 10 cm, width 10 cm, thickness 3 mm), and resin composition The product was cured to obtain a molded product. After removing the molded product, the presence or absence of cracks was visually confirmed and evaluated as follows.
“◯”: There is no crack.
"X": A crack is also a part.

[Method of evaluating internal curability]
The moisture-curable urethane hot melt resin compositions obtained in the examples and comparative examples were heated and melted to 110 ° C. and poured into a 23 ° C. aluminum mold (length 10 cm, width 10 cm, thickness 3 mm). After the injection, the molded product was allowed to stand for 5 days under the conditions of 23 ° C. and 50% humidity, and then left for 100 hours under the conditions of 80 ° C. and 95% humidity, and the presence or absence of deformation was evaluated.
“○”: No deformation “×”: Deformation

Abbreviations in Tables 1 and 2 will be described.
“Crystalline Polyester Polyol-2”; 1,6-hexanediol and sebacic acid reacted, number average part data 3,500
“Aromatic polyester polyol-1”; reaction of ethylene glycol, neopentyl glycol, terephthalic acid and isophthalic acid, number average molecular weight 3,500

  It turned out that the thing of Examples 1-6 which is the moisture hardening type urethane hot-melt resin composition of this invention is excellent in internal curability, mold release property, and moldability.

  On the other hand, although the comparative example 1 is an aspect which does not contain a silane coupling agent (ii), internal sclerosis | hardenability was unsatisfactory.

  Comparative Example 2 is an embodiment that does not contain a tertiary amine compound, but the internal curability was poor.

  Although the comparative example 3 is an aspect which does not use a polytetramethylene glycol (A-1) as a polyol (A), the moldability was unsatisfactory.

  Although the comparative example 4 is an aspect which does not use polyether triol (A-2) as a polyol (A), internal curability was inferior.

  In Comparative Example 5, the polyether polyol (A-3) was not used as the polyol (A), but the internal curability was poor.

Claims (3)

Polytetramethylene glycol (A-1), polyether triol (A-2), polyether polyol (A-3) obtained from ethylene oxide and propylene oxide, and polyol containing crystalline polyester polyol (A-4) ( Moisture characterized by containing a urethane prepolymer (i) having an isocyanate group obtained by reacting A) with a polyisocyanate (B), a silane coupling agent (ii) and a tertiary amine compound (iii) A curable urethane hot melt resin composition. The total content of the polytetramethylene glycol (A-1), the polyether triol (A-2) and the polyether polyol (A-3) is 25% by mass or less in the total amount of the polyol (A). The moisture curable urethane hot melt resin composition described. A molded article obtained by using the moisture-curable urethane hot melt resin composition according to any one of claims 1 to 4.