WO2022163443A1 - 光硬化性樹脂組成物および三次元光造形物 - Google Patents
光硬化性樹脂組成物および三次元光造形物 Download PDFInfo
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- WO2022163443A1 WO2022163443A1 PCT/JP2022/001648 JP2022001648W WO2022163443A1 WO 2022163443 A1 WO2022163443 A1 WO 2022163443A1 JP 2022001648 W JP2022001648 W JP 2022001648W WO 2022163443 A1 WO2022163443 A1 WO 2022163443A1
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Images
Classifications
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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
- C08F2/00—Processes of polymerisation
- C08F2/46—Polymerisation initiated by wave energy or particle radiation
- C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/124—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified
- B29C64/129—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified characterised by the energy source therefor, e.g. by global irradiation combined with a mask
-
- 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
- C08F2/00—Processes of polymerisation
- C08F2/46—Polymerisation initiated by wave energy or particle radiation
- C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
- C08F2/50—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light with sensitising agents
-
- 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
- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
- C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
- C08F290/06—Polymers provided for in subclass C08G
- C08F290/067—Polyurethanes; Polyureas
-
- 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
- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
- C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
- C08F290/06—Polymers provided for in subclass C08G
- C08F290/068—Polysiloxanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/124—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
-
- 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
- C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
- C08F2500/32—Glass transition temperature [Tg]
Definitions
- the present invention relates to a photocurable resin composition and a three-dimensional stereolithographic object.
- liquid rubber, an amine-based urethane acrylate oligomer, and a monomer are included, and the total content of the amine-based urethane acrylate oligomer and the monomer is 30 parts by mass or more with respect to 100 parts by mass of the liquid rubber.
- a rubber composition for three-dimensional additive manufacturing has been proposed.
- Patent Document 2 proposes a rubber composition for three-dimensional additive manufacturing that contains liquid rubber, an inorganic filler, and a trialkoxysilane that does not have a (meth)acryloyl group.
- Patent Documents 1 and 2 although rubber elasticity can be imparted to the cured product, it is difficult to ensure a tough breaking strength.
- a rubber composition containing liquid rubber as a main component has a high viscosity at room temperature, and it tends to be difficult to obtain a precise three-dimensional stereolithographic object.
- One aspect of the present invention is a photocurable resin composition containing a reactive compound and a photopolymerization initiator, wherein the cured product of the photocurable resin composition contains two or more of TgA and TgB
- TgA is less than 25°C
- TgB is 25°C or more
- the cured product of the photocurable resin composition has an elongation at break of 130% according to ASTM D638.
- the cured product of the photocurable resin composition has a breaking strength of 3 MPa or more according to ASTM D638.
- Another aspect of the present invention relates to a three-dimensional stereolithographic object that is a photocured product of the photocurable resin composition.
- Still another aspect of the present invention is a cured product of a photocurable resin composition
- the cured product of the photocurable resin composition has two or more glass transition points including TgA and TgB, and the The TgA is less than 25°C, the TgB is 25°C or more, the elongation at break according to ASTM D638 of the cured product is 130% or more, and the breaking strength of the cured product according to ASTM D638 is
- the present invention relates to a three-dimensional stereolithographic object having a pressure of 3 MPa or more.
- Each of the above aspects provides a three-dimensional stereolithographic article capable of achieving both excellent elongation at break and excellent breaking strength, and a photocurable resin composition that provides the same.
- FIG. 2 is a schematic diagram for explaining the process of forming a three-dimensional stereolithographic object using the photocurable resin composition according to one embodiment of the present invention.
- a (meth)acryloyl group means an acryloyl group, a methacryloyl group, or both.
- (meth)acrylic ester (or (meth)acrylate) means acrylic ester (or acrylate) or methacrylic ester (or methacrylate) or both.
- (meth)acrylic has the meaning of "acrylic” or “methacrylic” or both.
- a three-dimensional stereolithography product is a cured product formed by three-dimensional stereolithography (or three-dimensional lamination molding).
- the three-dimensional stereolithographic object is also simply referred to as the "photolithographic object” or the "cured product”.
- Stereolithography may require excellent flexibility and high mechanical strength depending on the application.
- stereolithographic objects with excellent flexibility are required to have high stretchability due to rubber elasticity, and high viscosity to highly relieve stress accompanying deformation (hereinafter also referred to as “stress relaxation”). may be requested.
- the use of the stereolithographic object A is not particularly limited, but for example, it may be used in applications that require shock absorption, vibration isolation, and damping properties.
- Examples of shoe cushion materials include those incorporated into shoe insoles and midsoles.
- a photocurable resin composition according to an embodiment of the present invention (hereinafter also referred to as “photocurable resin composition A”) and a stereolithographic object formed using the same (hereinafter, “photolithographic object A” or Also referred to as “cured product A”.), regardless of whether the cured product A is required to have high stretchability or high stress relaxation properties, achieves both flexibility and mechanical strength with a high degree of satisfaction. can satisfy In addition, the temperature dependence of physical properties is small, and stable physical properties can be easily obtained throughout the four seasons. Stable physical properties can also be obtained in various areas or places because the physical properties have little temperature dependence. Therefore, the photocurable resin composition A and the stereolithographic product A (cured product A) can be applied to various uses including the above uses.
- the present invention also includes the use of the photocurable resin composition A or the photocured product A for the above-mentioned uses (for example, cushioning materials for shoes).
- a cured product means a cured product in a completely cured state.
- a completely cured state means a state in which necessary and sufficient light irradiation is performed until the polymerization reaction is saturated using a necessary and sufficient photopolymerization initiator.
- the completely cured state is also a state in which the polymerization reaction does not proceed further even if light irradiation is performed further.
- the liquid film of the photocurable resin composition having a thickness of 500 ⁇ m can be completely cured by irradiating it with LED light.
- a liquid film of a photocurable resin composition having a thickness of 500 ⁇ m can be sandwiched between a pair of glass plates and irradiated with UV light of 7 mW/cm 2 for 60 seconds from both sides to completely cure the liquid film. can.
- Stereolithographic product A (cured product A) has two or more glass transition points including TgA and TgB. TgA is less than 25°C. TgB is 25° C. or higher.
- the cured product A When the cured product A has at least TgA and TgB, the cured product A can achieve both excellent elongation at break and excellent breaking strength in the normal temperature range.
- the normal temperature range is, for example, a temperature range between TgA and TgB.
- the cured product A having TgA and TgB contains a component that imparts flexibility and a component that imparts toughness to the cured product A.
- the component that imparts flexibility to the cured product A mainly imparts flexibility to the cured product A at a temperature higher than TgA.
- the component that imparts toughness to cured product A mainly imparts toughness to cured product A at a temperature lower than TgB.
- the component that imparts flexibility and the component that imparts toughness phase-separate in a well-balanced manner, so that the cured product A contains at least TgA and TgB, and the properties of each component are effectively exhibited. Both the excellent elongation at break of A and the excellent breaking strength can be achieved.
- the TgA may be -30°C or lower, -35°C or lower, or -40°C or lower.
- TgA may be -60°C or higher, or -50°C or higher, for example.
- the lower limit and upper limit can be combined arbitrarily.
- TgA may be, for example, -60°C or higher and 25°C or lower, -60°C (or -50°C) or higher and -30°C or lower, or -60°C or higher and -40°C or lower.
- TgB may be 30°C or higher, 40°C or higher, 50°C or higher, 60°C or higher, or 70°C or higher.
- TgB may be, for example, 250° C. or lower, 210° C. or lower, 150° C. or lower, or 100° C. or lower.
- the lower limit and upper limit can be combined arbitrarily.
- TgB for example, may be 25 ° C. or higher and 250 ° C. or lower (or 150 ° C.), may be 25 ° C. or higher and 250 ° C. or lower (or 150 ° C.), may be 30 ° C. or higher and 250 ° C. or lower (or 150 ° C.), or may be 40 ° C. or higher. 250° C.
- TgB may be less than or equal to 210°C or less than or equal to 100°C.
- ⁇ TBA is preferably 60° C. or higher, 70° C. or higher, 80° C. or higher, 90° C. or higher, 100° C. or higher, 110° C. or higher, 120° C. or higher, 130° C. or higher (for example, 200° C. °C or higher). Since ⁇ TBA is preferably as large as possible, the upper limit is not particularly limited. ⁇ TBA may be selected according to the required performance. ⁇ TBA may be, for example, 300° C. or less.
- the glass transition point of the cured product A is, for example, the Tg of the cured product A measured using a commercially available DMA (dynamic viscoelasticity measurement) device.
- Cured product A is set in a DMA device, for example, at a frequency of 1 Hz and a temperature increase rate of 5 ° C./min, the temperature is raised from the first predetermined temperature to the second predetermined temperature (eg -100 ° C. to +300 ° C.), and tan ⁇ is obtained as the Tg of the cured product A.
- the elongation at break of the cured product A conforming to ASTM D638 (hereinafter simply referred to as "elongation at break") is used as an index of flexibility.
- the elongation at break is 130% or more, 140% or more, 150% or more, 200% or more, 300% or more, 400% or more, or 500% or more.
- the upper limit of the elongation at break is not particularly limited, but from the viewpoint of easily ensuring high mechanical strength, it is, for example, 1500% or less, may be 1000% or less, or may be 800% or less. These lower and upper limits can be combined arbitrarily.
- the elongation at break may be 130% or more and 1500% or less (or 1000% or less), or 130°C or more and 800% or less. In these ranges, the lower limits may be replaced with the above values.
- the elongation at break is measured using a test piece formed from the cured product A.
- a test piece having a thickness of 500 ⁇ m and a width of 15 mm is usually used.
- the measurement is performed under the conditions of 23° C., a distance between chucks of 20 mm, and a tensile speed of 200 mm/min.
- a commercially available tensile tester is used for the measurement.
- Physical properties elongation at break and breaking strength described below) are measured for a plurality of (for example, five) test pieces, and averaged to obtain an average value.
- breaking strength is used as an index of mechanical strength.
- the breaking strength of the cured product A is 3 MPa or more, may exceed 5 MPa, may be 7 MPa or more, may be 9 MPa or more, may be 10 MPa or more, or may be 15 MPa or more. Thereby, high mechanical strength of the cured product A can be ensured.
- the upper limit of the breaking strength is not particularly limited, it may be 50 MPa or less, 40 MPa or less, or 30 MPa or less from the viewpoint of easily ensuring high elongation at break. These lower and upper limits can be combined arbitrarily.
- the breaking strength may be 3 MPa or more and 50 MPa or less (or 40 MPa or less), or 3 MPa or more and 30 MPa or less. In these ranges, the lower limits may be replaced with the above numerical values.
- the breaking strength is measured using a test piece formed from the cured product A.
- As the test piece the same one as used for the measurement of elongation at break can be used. The same measurement conditions as those for the elongation at break are used.
- the breaking energy which is the product of the value of the breaking strength (MPa) of the cured product A and the value of the elongation at break (%), is, for example, 950 or more, may be 1000 or more, may be 2000 or more, or may be 2200 or more, It may be 5,000 or more, or 6,000 or more, or 9,000 or more, or 10,000 or more.
- the breaking energy may be, for example, 75,000 or less.
- the storage modulus of the cured product A at 25°C may be 500 MPa or less, 200 MPa or less, or 150 MPa or less. Such a compound tends to ensure sufficient flexibility from summer to winter, for example.
- the storage elastic modulus at 25° C. may be, for example, 5 MPa or more, 8 MPa or more, 10 MPa or more, 20 MPa or more, or 40 MPa or more. These lower and upper limits can be combined arbitrarily.
- the absolute value ( ⁇ E (25-40)) of the difference between the storage modulus of cured product A at 25°C (E(25)) and the storage elastic modulus of cured product A at 40°C (E(40)) is From the viewpoint of improving the stability of the physical properties of the cured product A, it is preferably small.
- the Shore A hardness of the cured product A at 23°C is, for example, 100 or less. In this case, the cured product A can ensure higher flexibility.
- the Shore A hardness of the cured product A at 23° C. may be 60 or less, 50 or less, or 40 or less.
- the lower limit of the Shore A hardness is not particularly limited, it is preferably 15 or more, and may be 20 or more, from the viewpoint of ensuring a certain degree of strength. These upper and lower limits can be combined arbitrarily.
- the Shore A hardness at 23° C. of the cured product A may be, for example, 15 or more and 100 or less, or may be 20 or more and 100 or less. In these ranges, the upper limits may be replaced with the above numerical values.
- the Shore A hardness of the cured product (or cured product A) is measured at 23°C in accordance with JIS K6253: 2012, using a cured product with a thickness of 4 mm or more, using a commercially available durometer, under load It can be measured under the condition of 1 kg.
- the stress relaxation property of the cured product A can be evaluated using the tan ⁇ of the cured product A. For example, when tan ⁇ exceeds 0.2, stress relaxation is large, and when tan ⁇ is 0.2 or less, there is no stress relaxation, and the cured product A can be said to have rubber elasticity. As tan ⁇ becomes smaller, the impact resilience tends to increase. tan ⁇ may be determined according to required performance.
- tan ⁇ is, for example, 0.65 or less (e.g., 0.001 or more and 0.65 or less), may be 0.35 or less (e.g., 0.008 or more or 0.01 or more, 0.35 or less), 0.3 or less (eg, 0.008 or more, or 0.01 or more (eg, 0.1 or more), or 0.3 or less).
- the rebound resilience of the cured product A at 25°C is, for example, 20% or more, preferably 30% or more, or 40% or more, and may be 45% or more.
- the upper limit of the impact resilience of the cured product A at 25° C. can be selected depending on the application, and may be, for example, 100% or less, 90% or less, 70% or less, or 65% or less. These lower limit values and upper limit values can be combined arbitrarily.
- the impact resilience of the cured product A at 25° C. may be, for example, 20% or more (or 30% or more) and 100% or less, or 45% or more (or 45% or more) and 100% or less. Also, in these ranges, the upper limits may be replaced with the above values.
- the rebound resilience is measured using a rebound resilience tester using a test piece formed from the cured product A.
- a cylindrical photocured material having a diameter of 29 mm and a thickness of 12.5 mm is usually used.
- a test piece is a completely cured product obtained by light irradiation. Measurements are made in accordance with ASTM D 1054 at 25°C.
- the rebound resilience tester for example, a rebound resilience tester manufactured by Bareiss is used.
- the rebound resilience modulus is measured for a plurality of (for example, three) test pieces and averaged to obtain an average value.
- the photocurable resin composition A is a photocurable resin composition that can be used as a three-dimensional stereolithography material, and contains a reactive compound and a photopolymerization initiator. Therefore, the present invention includes the use of the photocurable resin composition A as a material for three-dimensional stereolithography and the use of the photocurable resin composition A for three-dimensional stereolithography.
- the reactive compound and the photopolymerization initiator are selected so that stereolithographic product A (cured product A) obtained by three-dimensional stereolithography has two or more glass transition points including TgA and TgB. However, TgA is below 25°C and TgB is above 25°C.
- the reactive compound and the photopolymerization initiator make the elongation at break according to ASTM D638 of the cured product A obtained by three-dimensional stereolithography 130% or more (e.g., 150% or more), and the elongation at break according to ASTM D638
- the strength is chosen to be greater than or equal to 3 MPa.
- Reactivity in a reactive compound means that a compound (e.g., monomer or oligomer) has a reactive group that participates in a curing reaction using a photoinitiator. means to have In addition, the reactive oligomer includes at least a repeating portion (the number of repetitions is 2 or more) of the constituent unit, and is distinguished from the reactive monomer.
- a reactive compound includes a first compound and a second compound.
- the first compound mainly imparts the physical property of low Tg to the cured product A.
- the second compound mainly imparts a high Tg physical property to the cured product A.
- the first compound includes at least one of a first monofunctional monomer and a first oligomer.
- the second compound includes at least one of a second monofunctional monomer and a second oligomer.
- the reactive compound desirably contains at least one of the first monofunctional monomer and the second monofunctional monomer. By using at least a monofunctional monomer, it becomes easier for the cured product A to ensure high flexibility and stretchability.
- a monofunctional monomer also contributes to maintaining the viscosity of the photocurable resin composition A within an appropriate range.
- the glass transition point Tg1 of the cured product of the first compound is, for example, 10 ° C. or lower, may be 0 ° C. or lower, may be -20 ° C. or lower, may be -30 ° C. or lower, or -40 ° C. or lower.
- the first compound may be a mixture of multiple components.
- the lower limit of the glass transition point Tg1 of the cured product of the first compound is not particularly limited, but from the viewpoint of ensuring sufficient toughness of the cured product A, it may be -130°C or higher.
- the glass transition point Tg2 of the cured product of the second compound is, for example, 50°C or higher, may be 80°C or higher, may be 90°C or higher, or may be 100°C or higher. , 120° C. or higher, or 200° C. or higher.
- the second compound may be a mixture of multiple components.
- the upper limit of the glass transition point Tg2 of the cured product of the second compound is not particularly limited, but from the viewpoint of ensuring sufficient flexibility of the cured product A, it may be 280°C or less.
- Tg1 and Tg2 can be reflected in the difference between TgA and TgB ( ⁇ TBA).
- a difference ( ⁇ (T21-TBA)) may occur between ⁇ T21 and ⁇ TBA depending on the degree of compatibility between the first compound and the second compound.
- ⁇ TBA tends to be smaller than ⁇ T21. Therefore, ⁇ (T21 ⁇ TBA) is a value obtained by subtracting ⁇ TBA from ⁇ T21, but if it can take a negative value, it is taken as an absolute value. In other words, ⁇ (T21-TBA) corresponds to the absolute value of the difference between ⁇ T21 and ⁇ TBA.
- ⁇ T21 is, for example, 150° C. or higher, and may be 200° C. or higher.
- ⁇ (T21 ⁇ TBA) is, for example, 300° C. or less, and may be 200° C. or less.
- Such a cured product can achieve both stable flexibility and strength from summer to winter, for example.
- the range of ⁇ (T21-TBA) is, for example, 100° C. or less, may be 78° C. or less, or may be 75° C. or less.
- the Tg of the cured product of the first compound is, for example, the Tg of the cured product of the first compound measured using a commercially available DMA.
- the Tg of the cured product of the second compound can be measured using DMA for the cured product of the second compound, similarly to the Tg of the cured product A.
- the Tg of the first and second compounds may be measured for a cured product obtained by curing the first compound and the second compound separated from the photocurable resin composition, and the reactive compound from the photocurable resin composition. may be identified, and a cured product obtained by curing the same compound (or a mixture of compounds) prepared separately may be measured.
- a photopolymerization initiator for measuring Tg may be selected so that 95% or more of each of the first compound and the second compound is cured.
- the Tg of each component constituting the first and second compounds can be obtained from suppliers such as manufacturers.
- Tg1 and Tg2 may be calculated as a weighted average of Tg weighted by the mass proportion of each component.
- the mass ratio of the first compound to the second compound is, for example, 20/80 when the total mass of the first compound and the second compound is 100. ⁇ 85/15, may be 20/80 to 80/20, may be 25/75 to 75/25, or may be 30/70 to 70/30.
- the mass ratio of the reactive monomer and the reactive oligomer is determined by the reaction with the reactive monomer.
- the total mass with the soluble oligomer is 100, it may be, for example, 20/80 to 80/20, may be 25/75 to 70/30, or may be 30/70 to 70/30.
- the mass ratio of the reactive monomer and the reactive oligomer is in such a range, it becomes easier to ensure high strength of the cured product, and flexibility can be enhanced. In addition, it is possible to ensure a high curing rate while suppressing distortion during curing. Moreover, it is easy to adjust the viscosity of the photocurable resin composition.
- the photocurable resin composition A contains at least one first monofunctional monomer having a glass transition point of 10° C. or lower as a first compound and a glass of a cured product alone as a second compound. It may also contain at least one selected from the group consisting of a second monofunctional monomer having a transition point of 50° C. or higher and a second oligomer. Alternatively, the photocurable resin composition A includes at least one second monofunctional monomer having a glass transition point of 50° C. or higher as a second compound and a cured product alone as a first compound. and at least one selected from the group consisting of a first monofunctional monomer and a first oligomer having a glass transition point of 10° C. or lower. In this case, a cured product A having two or more glass transition points including TgA and TgB is likely to be obtained by three-dimensional stereolithography.
- the glass transition point of the cured product of each of the first monofunctional monomer and the first oligomer alone may be 0° C. or lower, ⁇ 10° C. or lower, ⁇ 20° C. or lower, or ⁇ 30° C. or lower, -40°C or lower is acceptable.
- the Tg of the cured product of each of the first monofunctional monomer and the first oligomer alone may be, for example, ⁇ 130° C. or higher, ⁇ 100° C. or higher, ⁇ 70° C. or higher, or ⁇ 65° C. or higher. Alternatively, it may be -60°C or higher.
- the lower limit and upper limit can be combined arbitrarily.
- the glass transition point of the cured product of each of the first monofunctional monomer and the first oligomer alone may be, for example, ⁇ 130° C. or higher and 0° C. or lower (or ⁇ 10° C. or lower), or ⁇ 130° C. or higher and ⁇ 20° C. or lower. (or -30°C or lower), or -130°C or higher and -40°C or lower. In these ranges, the lower limits may be replaced with the above values.
- the glass transition point of the cured product of each of the second monofunctional monomer and the second oligomer alone may be 50° C. or higher, but may be 70° C. or higher, 90° C. or higher, or 110° C. or higher. It may be 120°C or higher or 140°C or higher.
- the Tg of the cured product of each of the second monofunctional monomer and the second oligomer alone may be, for example, 250° C. or lower or 230° C. or lower.
- the lower limit and upper limit can be combined arbitrarily.
- the cured product of each of the second monofunctional monomer and the second oligomer alone may have a Tg of, for example, 50° C. or higher and 250° C. or lower, or 50° C. or higher and 230° C. or lower. In these ranges, the lower limits may be replaced with the above values.
- At least one of the first monofunctional monomer and the second monofunctional monomer may be an acrylic monomer, or both may be acrylic monomers.
- the first monofunctional monomer is an acrylic monomer
- the second monofunctional monomer is at least one selected from the group consisting of vinyl monomers, acrylic monomers, and monomers having a cyclic group containing a polymerizable unsaturated bond.
- the first oligomer may be an acrylic oligomer from the viewpoint of easily ensuring high stereolithography.
- the second oligomer may be an acrylic oligomer.
- the ratio of the first monofunctional monomer to the total reactive monomer may be, for example, 80% by mass or less (or 70% by mass or less), 5% by mass or more, or 9% by mass or more, and 80% by mass or less (or 70% by mass or less), 20% by mass or more and 80% by mass or less, or 30% by mass or more and 70% by mass or less. In this case, it is easier to obtain a cured product A having two or more glass transition points including TgA and TgB by three-dimensional stereolithography.
- the ratio of the second monofunctional monomer to the total reactive monomer may be, for example, 20% by mass or more (or 30% by mass or more), or 20% by mass or more (or 30% by mass or more) and 100% by mass or less.
- 20% by mass or more (or 30% by mass or more) may be 95% by mass or less, 20% by mass or more and 80% by mass or less, or 30% by mass or more and 70% by mass or less may be In this case, it is easier to obtain a cured product A having two or more glass transition points including TgA and TgB by three-dimensional stereolithography.
- the difference ( ⁇ dP) between the polar term dP 1 of the Hansen solubility parameter (HSP) of the first compound and the polar term dP 2 of the Hansen solubility parameter (HSP) of the second compound is 5.0 MPa 0.5 or more good too.
- the difference ( ⁇ dP) between the polarity term dP 1 and the polarity term dP 2 is 5.0 MPa 0.5 or more, the compatibility between the first compound and the second compound is moderately limited, and the phase separation state is optimal. easy to convert. As a result, it becomes easier to obtain the photocurable resin composition A that gives a cured product having two or more glass transition points including TgA and TgB.
- the properties of the components derived from the first compound and the second compound are exhibited more effectively, making it easier to control the balance between elongation at break and strength at break. Moreover, it becomes easy to obtain the photocurable resin composition A that gives a cured product with low temperature dependence.
- the solubility parameter represents a measure of affinity between substances, and HSP is represented by a three-dimensional vector of dispersion term dD, polarity term dP, and hydrogen bond term dH. If the first compound contains more than one reactive compound, dP 1 is determined from the dP and mass ratio of the individual reactive compounds. Similarly, if the second compound contains more than one reactive compound, dP2 is determined from the dP and mass fraction of the individual reactive compounds. That is, a weighted average of HSP values (dP) weighted by the mass ratio of each component may be calculated. When the HSP value of each component constituting the first and second compounds can be obtained from a supplier such as a manufacturer, the obtained HSP value may be used.
- the HSP values of the first and second compounds may be obtained by using the first compound and the second compound separated from the photocurable resin composition, identifying the reactive compound from the photocurable resin composition, and separately It may be determined using the same compound (or a mixture of compounds) prepared.
- the difference ( ⁇ dP) between dP 1 and dP 2 may be 0.3 MPa 0.5 or more, 1.5 MPa 0.5 or more, or 3.0 MPa 0.5 or more. From the viewpoint of easily obtaining higher elongation at break and breaking strength, ⁇ dP may be 5.0 MPa 0.5 or more, 6.0 MPa 0.5 or more, or 7.0 MPa 0.5 or more. ⁇ dP is the absolute value of the difference between dP1 and dP2 . A more uniform liquid photocurable resin composition A can be obtained, and TgA and TgB are likely to appear clearly after curing. 8 MPa 0.5 or less is more preferable. These lower and upper limits can be combined arbitrarily. ⁇ dP may be 0.3 MPa 0.5 or more and 10 MPa 0.5 or less, or 0.3 MPa 0.5 or more and 8 MPa 0.5 or less. In these ranges, the lower limits may be replaced with the above numerical values.
- the dispersion term dD, polar term dP, and hydrogen bonding term dH of each reactive compound can be determined using HSP calculation software HSPiP (available from HSP and HSPiP official sites). HSP may be calculated using the HSPiP database. HSPs of reactive compounds that do not exist in the database can be obtained by testing the solubility of each separately prepared reactive compound in all the media shown in Table 1. In Table 1, the ratio of numerical values with v/v indicates the mixing ratio (volume ratio) of the two media. The unit of HSP value in Table 1 is MPa 0.5 .
- the HSP of a reactive compound is obtained as follows.
- a reactive compound is added to each medium in Table 1 to a concentration of 0.1% by mass, and stirred for 10 minutes at room temperature (eg, 25° C.) using a roller shaker or screw tube. After stirring, the mixture is allowed to stand at room temperature (for example, 25° C.) for 1 hour. If the reactive compound is precipitated, it is scored as 0, and if it is dispersed or dissolved, it is scored as 1.
- the HSP of each medium (that is, the dispersion term dD, the polar term dP, and the hydrogen bonding term dH) is plotted three-dimensionally, and from the HSP distribution of the medium in which the reactive compound is dispersed or dissolved, Hansen's dissolving sphere and Create a sphere called and find the center coordinates of this sphere.
- the dispersion term dD, the polar term dP, and the hydrogen bonding term dH of each reactive compound can be obtained, respectively, with the central coordinate being the HSP of the reactive compound.
- the separation of the reactive compound from the photocurable resin composition can be performed using known separation methods such as centrifugation, extraction, crystallization, column chromatography and/or recrystallization. Identification of the reactive compound can be performed, for example, by analyzing the photocurable resin composition using gas chromatography, liquid chromatography, mass spectrum, or the like.
- the photocurable resin composition A is required to cure quickly.
- the viscosity at normal temperature is sufficiently low.
- it may be 10 mPa s or more and 7000 mPa s or less, 200 mPa s or more and 5000 mPa s or less, 200 mPa s or more and 3000 mPa s or less, or 200 mPa s or more and 2000 mPa s or less. It can be below.
- the viscosity of the photocurable resin composition A can be measured at a rotation speed of 20 rpm using, for example, a cone-plate type E-type viscometer.
- the first monofunctional monomer and the second monofunctional monomer are included in the category of reactive monomers.
- a monofunctional monomer has one reactive group.
- the reactive compound may contain not only monofunctional monomers but also polyfunctional monomers having two or more reactive groups as reactive monomers.
- a compound that can be cured or polymerized by the action of radicals, cations, and/or anions generated by light irradiation is used as the reactive monomer.
- the number of reactive groups in the polyfunctional monomer is, for example, 2-8, and may be 2-4.
- a reactive monomer it is preferable to use at least a monofunctional monomer, and a monofunctional monomer and a polyfunctional monomer may be used in combination.
- the glass transition point of the cured product of the first polyfunctional monomer alone is may be selected from the glass transition temperature range described for the cured product of .
- the second compound contains a polyfunctional monomer (second polyfunctional monomer)
- the glass transition point of the cured product of the second polyfunctional monomer alone is that of the second monofunctional monomer and the second oligomer alone. It may be selected from the range of the glass transition point described for the cured product, and may be above the lower limit value of the glass transition point described above and 300° C. or less.
- the average number of reactive groups per molecule of the reactive monomer may be, for example, 1-2.5, 1-2, 1-1. 5 is preferred, and 1 to 1.2 is more preferred.
- Monofunctional monomers alone may be used as reactive monomers.
- Examples of reactive groups include a group having a polymerizable carbon-carbon unsaturated bond and an epoxy group.
- the group having a polymerizable carbon-carbon unsaturated bond includes vinyl, allyl, dienyl, acryloyl, methacryloyl, and a cyclic group containing a polymerizable carbon-carbon unsaturated bond (e.g., a vinylene group or an ethynylene group). at least one hydrocarbon ring group or heterocyclic group), but are not limited thereto.
- the hydrocarbon cyclic group and heterocyclic group may be monocyclic, may be bridged cyclic, or may be condensed ring groups in which aromatic hydrocarbon rings (such as benzene rings) are condensed. good.
- the heterocyclic group includes, for example, at least one selected from the group consisting of a nitrogen atom, a sulfur atom and an oxygen atom as a ring-constituting heteroatom.
- the heterocyclic group may be a heterocyclic group containing at least a nitrogen atom as a ring-constituting heteroatom (such as a nitrogen atom-containing ring group).
- Such a heterocyclic group nitrogen atom-containing ring group
- the cyclic group may be 4- to 12-membered, 4- to 10-membered, or 5- to 8-membered.
- a cyclic group containing a polymerizable carbon-carbon unsaturated bond may have a substituent on the ring.
- Each of the alkyl group and the alkoxy group may have, for example, 1 to 6 carbon atoms, 1 to 4 carbon atoms, 1 to 3 carbon atoms, or 1 or 2 carbon atoms.
- the aryl group may be an aryl group having 6 to 10 carbon atoms or a phenyl group.
- the reactive monomer may be, for example, a vinyl-based monomer, an allyl-based monomer, an acrylic-based monomer, a monomer having a cyclic group containing a polymerizable carbon-carbon unsaturated bond, an epoxy compound, or the like.
- vinyl-based monomers include monomers having a vinyl group, such as vinyl ethers of hydroxy compounds (e.g., vinyl ethers of monohydric alcohols), aromatic vinyl monomers (styrene, etc.), alicyclic vinyl monomers, heterocyclic rings having a vinyl group.
- examples include compounds (nitrogen-containing cyclic compounds having a vinyl group such as N-vinylpyrrolidone and 3-vinyl-5-methyl-2-oxazolidinone).
- allyl-based monomers include monomers having an allyl group, such as allyl ethers of hydroxy compounds (allyl ethers of monohydric alcohols, etc.).
- acrylic monomers include monomers having a (meth)acryloyl group, such as (meth)acrylic acid esters of hydroxy compounds, acid amides of nitrogen-containing compounds and (meth)acrylic acid (nitrogen-containing compounds such as acryloylmorpholine and methacryloylmorpholine). acid amide of a cyclic compound and (meth)acrylic acid), (meth)acrylic acid, and the like.
- the nitrogen-containing ring corresponding to the nitrogen-containing cyclic compound includes, for example, pyrrole, imidazoline, pyrrolidine, imidazole, piperidine, In addition to pyridine and the like, heterocycles containing a nitrogen atom and other heteroatoms (morpholine, thiazine, oxathiazine, oxazolidine, oxazolidinone, etc.) are also included.
- Monomers having a cyclic group containing a polymerizable carbon-carbon unsaturated bond include maleimide compounds (eg, N-phenylmaleimide).
- the hydroxy compound may be an aliphatic hydroxy compound, an aromatic hydroxy compound, an alicyclic hydroxy compound, or a heterocyclic hydroxy compound.
- Hydroxy compounds may be either monohydric alcohols or polyols.
- Aliphatic hydroxy compounds may have aromatic, aliphatic and/or heterocyclic rings. Aliphatic rings may be bridged rings.
- the reactive monomer when the hydroxy compound is a polyol, all hydroxy groups may be etherified or esterified, or some hydroxy groups may be etherified or esterified.
- the hydroxy compound may be any of an aliphatic alcohol, an alicyclic alcohol, an aromatic alcohol (or an aromatic hydroxy compound (including phenols)), a heterocyclic alcohol, or an alkylene oxide adduct thereof.
- Aliphatic alcohols may have aromatic, aliphatic or heterocyclic rings.
- Aliphatic rings may be bridged rings. These hydroxy compounds have one or more hydroxy groups.
- aliphatic alcohols examples include alkyl alcohols (methanol, ethanol, propanol, isopropanol, butanol, hexanol, lauryl alcohol, stearyl alcohol, etc.), glycols (ethylene glycol, 1,3-propanediol, 1,4 -butanediol, polyalkylene glycols (diethylene glycol, dipropylene glycol, tetramethylene glycol, etc.), benzyl alcohol, phenethyl alcohol, xylylene glycol, monoesters of phthalic acid with ethylene glycol, phenoxyethyl alcohol, cyclohexanemethanol, cyclohexanedimethanol , tricyclodecanedimethanol, etc.
- alkyl alcohols methanol, ethanol, propanol, isopropanol, butanol, hexanol, lauryl alcohol, stearyl alcohol, etc.
- Aliphatic alcohols include, for example, C 1-20 fatty alcohols, may be C 1-10 fatty alcohols, C 1-6 fatty alcohols, (or a C 1-4 aliphatic alcohol).
- the aliphatic alcohol may be a mono- or di-C 1-6 aliphatic alcohol (mono- or di-C 1-4 aliphatic alcohol), etc.
- the hydrocarbon ring includes an aromatic hydrocarbon ring, an alicyclic hydrocarbon ring, etc. Examples of such an aliphatic alcohol include the above-exemplified aliphatic alcohols.
- benzyl alcohol, phenethyl alcohol, xylylene glycol, monoester of phthalic acid and ethylene glycol, phenoxyethyl alcohol, cyclohexanemethanol, cyclohexanedimethanol, tricyclodecanedimethanol, etc. are included.
- Aromatic alcohols Examples include aromatic C 6-10 alcohols such as phenol and naphthol.
- Heterocyclic alcohols include, for example, alcohols having a heterocyclic group containing a heteroatom as a ring-constituting atom.
- Aliphatic alcohols having a heterocyclic ring include aliphatic alcohols having a heterocyclic group containing a heteroatom as a ring-constituting atom.
- These heterocyclic groups include, for example, 4- to 8-membered heterocyclic groups, and may be 5- or 6-membered heterocyclic groups.
- the heterocyclic group may be an unsaturated heterocyclic group or a saturated heterocyclic group.
- Heteroatoms include nitrogen, oxygen, and/or sulfur.
- Heterocyclic rings corresponding to heterocyclic groups include oxygen-containing heterocyclic rings (furan, tetrahydrofuran, oxolane, dioxolane, tetrahydropyran, dioxane, etc.), nitrogen-containing heterocyclic rings (pyrrole, imidazoline, pyrrolidine, imidazole, piperidine, pyridine, isocyanuric acid etc.), sulfur-containing heterocycles (thiophene, tetrahydrothiophene, etc.), heterocycles containing multiple types of heteroatoms (morpholine, thiazine, oxathiazine, oxazolidine, oxazolidinone, etc.).
- oxygen-containing heterocyclic rings furan, tetrahydrofuran, oxolane, dioxolane, tetrahydropyran, dioxane, etc.
- nitrogen-containing heterocyclic rings pyrrole, imidazoline, pyr
- aliphatic alcohol having a heterocyclic group a C 1-6 aliphatic alcohol having a heterocyclic group or a C 1-4 aliphatic alcohol having a heterocyclic group is preferred.
- aliphatic alcohols containing isocyanuric acid as a heterocyclic ring include tris(2-hydroxyethyl) isocyanurate.
- Nitrogen-containing compounds that constitute (meth)acrylic acid and acid amides include aliphatic amines (triethylamine, ethanolamine, etc.), alicyclic amines (cyclohexylamine, etc.), aromatic amines (aniline, etc.), and nitrogen-containing cyclic compounds. etc.
- Nitrogen-containing cyclic compounds include pyrrole, pyrrolidine, piperidine, pyrimidine, morpholine, thiazine, and the like.
- the nitrogen-containing cyclic compound is preferably a 5- to 8-membered ring, and may be a 5- or 6-membered ring.
- the number of oxyalkylene groups contained in one molecule of the alkylene oxide adduct may be, for example, 1 or more and 10 or less, may be 1 or more and 6 or less, or may be 1 or more and 4 or less.
- the oxyalkylene group includes, for example, an oxyC 1-4 alkylene group (oxymethylene, oxyethylene, oxypropylene, oxytrimethylene group, etc.), an oxyC 1-2 alkylene group or an oxyC 2-3 alkylene group (oxyethylene group, etc.).
- epoxy compounds include compounds having an epoxy group (including compounds having a glycidyl group).
- Epoxy compounds may contain, for example, an epoxycyclohexane ring or a 2,3-epoxypropyloxy group.
- the second compound containing a nitrogen-containing monomer makes it easier to obtain a relatively large dP2 and to secure a relatively large ⁇ dP. Therefore, the state of phase separation between the first compound and the second compound is easily optimized.
- the properties of the components derived from the first compound and the second compound are exhibited more effectively, making it easier to control the balance between elongation at break and strength at break.
- dP2 becomes larger and ⁇ dP becomes even larger, so that a cured product A having an excellent balance between elongation at break and breaking strength can be easily obtained.
- the nitrogen-containing monomer contains a monomer having a nitrogen-containing ring, a higher TgB or Tg2 is likely to be obtained, making it easier to obtain a photocurable resin composition A that gives a cured product with less temperature dependence. .
- the first oligomer and the second oligomer are included in the category of reactive oligomers.
- the reactive oligomer may be a monofunctional oligomer having one reactive group or a polyfunctional oligomer having two or more reactive groups.
- an oligomer that can be cured or polymerized by the action of radicals, cations and/or anions generated by light irradiation is used.
- the reactive group of the reactive oligomer can be selected from those exemplified for the reactive monomer.
- the first oligomer may be a monofunctional oligomer having one reactive group, but from the viewpoint of easily achieving both high strength and high flexibility, a polyfunctional oligomer having two or more reactive groups It is preferable to include at least In addition, the polyfunctional oligomer cross-links the polymerized product of the reactive monomer, thereby ensuring high stretchability of the cured product.
- the number (average number) of reactive groups is, for example, 2 to 8, may be 2 to 4, or may be 1.5 to 2.5.
- the weight average molecular weight Mw of the oligomer is, for example, 8,000 or more, and may be 10,000 or more. From the viewpoint of easily ensuring high mechanical strength of the cured product, it is more preferably greater than 10,000, and more preferably 11,000 or more or 13,000 or more.
- the Mw of the oligomer is, for example, 40,000 or less, and may be 30,000 or less. When Mw is in such a range, it can be mixed more uniformly with the reactive monomer, and thus high mechanical strength can be easily secured. These lower and upper limits can be combined arbitrarily.
- the weight average molecular weight Mw is the polystyrene equivalent weight average molecular weight measured using gel permeation chromatography (GPC).
- the Mw of the oligomer is determined, for example, by the following procedure.
- a sample for measurement is prepared by dissolving the oligomer in a solvent.
- the solvent is selected from liquid media capable of dissolving the oligomer, depending on the type of oligomer.
- GPC is measured under the following conditions to determine Mw.
- Apparatus SYSTEM-21H manufactured by SHODEX Detector: RI detector
- Mobile phase Tetrahydrofuran Flow rate: 1 mL/min
- Column temperature: 40°C Reference material: standard polystyrene (Mw 65000, 5780, 589)
- the first oligomer may be used singly or in combination of two or more. For example, two or more of different types may be combined, or two or more of different Mw may be combined.
- the second oligomer may be used singly or in combination of two or more. For example, two or more of different types may be combined, or two or more of different Mw may be combined.
- an oligomer (acrylic oligomer) having a (meth)acryloyl group as a reactive group.
- the content of the (meth)acryloyl group-containing oligomer in the entire reactive oligomer is, for example, 80% by mass or more, may be 90% by mass or more, or may be 95% by mass or more.
- the first and/or second oligomer may be composed only of oligomers having (meth)acryloyl groups.
- first and second oligomers include (meth)acrylates of polyhydroxy compounds.
- Polyhydroxy compounds include polyalkylene glycols, alkylene oxide adducts of aliphatic polyols or aliphatic polyamines (triethanolamine, ethylenediamine, etc.), alicyclic polyols (hydrogenated bisphenols, etc.) or alkylene oxides of alicyclic polyamines. Adducts, aromatic polyols (such as bisphenols) or alkylene oxide adducts of aromatic polyamines, oligomer type polyols, and the like can be mentioned.
- Aliphatic polyols include aliphatic polyols having three or more hydroxy groups (glycerin, trimethylolpropane, pentaerythritol, etc.), sugars (sorbitol, sucrose, etc.), and the like.
- oligomer-type polyols examples include polyether polyols, polyester polyols, polyether ester polyols, polyurethane polyols, polyester urethane polyols, polyether urethane polyols, and polycarbonate polyols. These polyols may have aromatic rings, aliphatic rings, and/or heterocyclic rings (such as heterocyclic rings containing heteroatoms (such as oxygen, nitrogen, and/or sulfur) as ring constituent elements).
- (Meth)acrylates of polyurethane polyols and/or (meth)acrylates of polyether urethane polyols may be used from the viewpoint of facilitating a balance between toughness and strength of the cured product. When using a (meth)acrylate of a polyol having a urethane structure, heat resistance can also be enhanced.
- the oligomer preferably contains a polyoxyalkylene chain.
- a polyoxyalkylene chain When an oligomer containing a polyoxyalkylene chain is used, cross-linking at portions other than the reactive groups is suppressed, so that a linear polymer can easily be obtained by polymerization of the reactive monomer. Therefore, it becomes easy to obtain a cured product having excellent elongation at break and mechanical strength and high shrinkability.
- a polyoxyalkylene chain is usually contained in a polyhydroxy compound.
- the portion to which the alkylene oxide is attached is the polyoxyalkylene chain.
- polyoxyalkylene chains are also included in polyalkylene glycols, oligomer-type polyols having polyether chains (specifically, polyether polyols, polyether ester polyols, polyether urethane polyols, etc.). Oligomers using such polyols are also preferred. From the viewpoint of ensuring higher strength, among these, an oligomer-type polyol having a polyether chain (more specifically, a polyoxyalkylene chain) is preferable.
- Polyoxyalkylene chains include, for example, polyoxy C 2-4 alkylene chains.
- the polyoxyalkylene chain includes, for example, a repeating structure of at least one oxyalkylene unit selected from oxyethylene, oxypropylene, oxytrimethylene, oxybutylene, and the like.
- the number of oxyalkylene groups contained in one molecule of the oligomer may be, for example, more than 10, 20 or more, or 50 or more.
- the upper limit of the number of oxyalkylene groups contained in one molecule of the oligomer is not particularly limited, and can be selected according to, for example, the upper limit of Mw of the oligomer.
- the number of oxyalkylene groups contained in one molecule of the oligomer is, for example, 800 or less, and may be 600 or less. These lower and upper limits can be combined arbitrarily.
- the number of oxyalkylene groups contained in one molecule of the oligomer is more than 10 and 800 or less (or 600 or less), 20 or more and 800 or less (or 600 or less), or 50 or more and 800 or less (or 600 or less). good.
- an acrylic oligomer may be synthesized by esterifying a polyhydroxy compound (e.g., the polyhydroxy compound described above) and (meth)acrylic acid, and a (meth)acrylate having a hydroxy group ( CH2 It may be synthesized by reacting ⁇ CH(—R 3 )—C( ⁇ O)OR 4 —OH) with an oligomer having a functional group that reacts with a hydroxy group.
- the oligomer moiety having --OR 4 --OR 5 -- groups corresponds to the above polyhydroxy compound.
- R3 is a hydrogen atom or a methyl group
- R4 is a divalent organic group (such as an alkylene group)
- R5 is formed by the reaction of the above functional group with a hydroxy group. is a residue.
- an acrylic oligomer having a urethane structure can be obtained by reacting a polyhydroxy compound (among the above polyhydroxy compounds, polyether polyol, polyester polyol, polyether ester polyol, polycarbonate polyol, etc.) with a polyisocyanate to form a polyhydroxy It can be obtained by introducing an isocyanate group into the terminal of the compound and reacting the introduced terminal isocyanate group with a (meth)acrylate having a hydroxy group.
- the polyisocyanate is not particularly limited, and may be aliphatic polyisocyanate (such as non-yellowing type polyisocyanate), aromatic polyisocyanate (such as yellowing type polyisocyanate), and/or non-yellowing type polyisocyanate. is mentioned.
- (Meth)acrylates having a hydroxy group may be aromatic, alicyclic or aliphatic, but hydroxyalkyl (meth)acrylates (hydroxyC 1-6 alkyl (meth)acrylates (hydroxyethyl ( meth) acrylate, etc.) are often used. Each reaction is a well-known reaction, and known reaction conditions may be adopted.
- the photopolymerization initiator contained in the photocurable resin composition A is activated by the action of light to initiate curing (specifically, polymerization) of the photocurable monomer and oligomer.
- photopolymerization initiators include radical polymerization initiators that generate radicals by the action of light, and those that generate acids (or cations) by the action of light (specifically, cation generators).
- a photoinitiator may be used individually by 1 type, and may be used in combination of 2 or more types. The photoinitiator is selected according to the type of polymerizable compound, for example, whether it is radically polymerizable or cationically polymerizable.
- radical polymerization initiators include alkylphenone-based photopolymerization initiators and acylphosphine oxide-based photopolymerization initiators.
- alkylphenone-based photopolymerization initiators include 2,2-dimethoxy-1,2-diphenylethan-1-one, 1-hydroxy-cyclohexyl-phenyl-ketone, 2-hydroxy-2-methyl-1-phenyl -propan-1-one, 1-[4-(2-hydroxyethoxy)-phenyl]-2-hydroxy-2-methyl-1-propan-1-one, 2-hydroxy-1- ⁇ 4-[4- (2-hydroxy-2-methyl-propionyl)-benzyl]phenyl ⁇ -2-methyl-propan-1-one, 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butanone-1,2-(dimethylamino)-2-[(4-methylphenyl)methyl]-1-[4-(4- morpholinyl)phenyl]-1-butanone and the like.
- acylphosphine oxide-based photopolymerization initiators examples include 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide and bis(2,4,6-trimethylbenzoyl)-phenyl-phosphine oxide.
- photopolymerization initiators are merely examples and are not limited to these.
- the photocurable resin composition A may contain ceramic particles.
- the ceramic particles improve the elongation at break of the cured product A and improve the mechanical strength. Ceramic particles usually have functional groups such as inorganic hydroxyl groups on their surfaces. Pseudo-crosslinking points are formed by the functional groups interacting with reactive monomers, reactive oligomers, or polymers thereof through hydrogen bonding or the like.
- Ceramic particles include silica particles, titania particles, alumina particles, and zirconia particles.
- the photocurable resin composition A may contain one type of these ceramic particles, or may contain two or more types in combination. From the viewpoint of easily obtaining high transparency, the ceramic particles preferably contain at least silica particles. Among them, it is preferable to use monodisperse type (for example, colloidal type) ceramic particles.
- the average particle size of the ceramic particles may be 10 ⁇ m or less, 1 ⁇ m or less, or 500 nm or less.
- the average particle size of the ceramic particles is preferably 100 nm or less in terms of facilitating uniform dispersion in the photocurable resin composition A.
- the average particle size of the ceramic particles may be 5 nm or more, or 10 nm or more.
- the average particle size is determined as the particle size (D50) at 50% of the cumulative volume of the volume-based particle size distribution measured using a laser diffraction/scattering type particle size distribution analyzer.
- the average particle diameter shall be obtained using a particle size distribution measuring device based on the dynamic light scattering method.
- the content of ceramic particles in the photocurable resin composition A is, for example, 0.1% by mass or more.
- the content of ceramic particles may be 1% by mass or more, or 5% by mass or more.
- the content of the ceramic particles is preferably 50% by mass or less, and may be 40% by mass or less, in order to easily ensure higher flexibility of the cured product.
- the photocurable resin composition A may further contain other known curable resins.
- the photocurable resin composition A can contain a thiol compound, an amine compound, and known additives (eg, colorants, antioxidants, antifoaming agents, fillers, stabilizers, etc.).
- Three-dimensional stereolithography is, for example, the step (i) of forming a liquid film of the photocurable resin composition A and curing the liquid film to form a pattern, and forming another liquid film so as to be in contact with the pattern. and a step (iii) of curing another liquid film on the pattern and laminating another pattern.
- FIG. 1 shows an example of forming a three-dimensional structure using a stereolithography apparatus (patterning apparatus) having a resin tank (bat).
- the hanging-type modeling is shown, but the method is not particularly limited as long as it is a method that enables three-dimensional stereolithography using the photocurable resin composition A.
- the method of light irradiation (exposure) is not particularly limited, and point exposure or surface exposure may be used.
- the patterning device 1 includes a platform 2 having a pattern forming surface 2a, a resin tank 3 containing a photocurable resin composition A (5), and a projector 4 as a surface exposure light source.
- step (i) Step of forming a liquid film and curing it to form a pattern
- step (i) as shown in (a), first, the photocurable resin composition A contained in the resin tank 3 is coated with a platform.
- the pattern forming surface 2a of 2 is immersed in a state facing the projector 4 (that is, the bottom surface of the resin tank 3). At this time, the height of the pattern formation surface 2a (or the platform 2) is adjusted so that the liquid film 7a (liquid film a) is formed between the pattern formation surface 2a and the projector 4 (or the bottom surface of the resin tank 3). to adjust.
- the liquid film 7a is photo-cured by irradiating the liquid film 7a with the light L from the projector 4 (surface exposure) to form a pattern 8a (pattern a).
- the resin tank 3 serves as a supply unit for the photocurable resin composition A. At least the portion of the resin tank (bottom surface in the illustrated example) between the liquid film and the projector 4 is preferably transparent to the exposure wavelength so that the liquid film is irradiated with light from the light source.
- the shape, material, size, etc. of the platform 2 are not particularly limited.
- the liquid film a is photo-cured by irradiating the liquid film a with light from a light source.
- Light irradiation can be performed by a known method.
- the exposure method is not particularly limited, and may be point exposure or surface exposure.
- a known light source used for photocuring can be used as the light source.
- a plotter method, a galvano laser (or galvano scanner) method, an SLA (stereolithography) method, and the like can be used.
- the surface exposure method it is convenient to use a projector as the light source.
- Examples of projectors include an LCD (transmissive liquid crystal) system, an LCoS (reflective liquid crystal) system, and a DLP (registered trademark, Digital Light Processing) system.
- the exposure wavelength can be appropriately selected according to the constituent components of the photocurable resin composition A (in particular, the type of initiator).
- step (ii) Step of forming a liquid film between the pattern a and the light source
- the photocurable resin composition A is supplied between the pattern a obtained in step (i) and the light source. to form a liquid film (liquid film b). That is, the liquid film b is formed on the pattern a formed on the pattern forming surface.
- the description of step (i) can be referred to.
- step (ii) of FIG. 1 after forming a two-dimensional pattern 8a (two-dimensional pattern a), the pattern formation surface 2a may be lifted together with the platform 2.
- the liquid film 7b liquid film b
- step (iii) A step of laminating another pattern b on the pattern a.
- the liquid film b formed in the step (ii) is exposed from a light source to photocure the liquid film b, forming a pattern.
- Another pattern (pattern b obtained by photocuring of liquid film b) is laminated on a. By stacking patterns in the thickness direction in this manner, a three-dimensional fabrication pattern can be formed.
- the liquid film 7b (liquid film b) formed between the pattern 8a (pattern a) and the bottom surface of the resin tank 3 is exposed from the projector 4 to expose the liquid.
- the film 7b is photocured. This photocuring converts the liquid film 7b into a pattern 8b (pattern b).
- the pattern 8b can be laminated on the pattern 8a.
- the description of step (i) can be referred to.
- the first step can include step (iv) repeating steps (ii) and (iii) multiple times.
- step (iv) a plurality of patterns b are laminated in the thickness direction, and a three-dimensional shaped pattern is obtained.
- the number of repetitions can be appropriately determined according to the shape and size of a desired three-dimensional structure (three-dimensional structure pattern).
- the platform 2 in which the pattern 8a (pattern a) and the pattern 8b (pattern b) are laminated on the pattern forming surface 2a is raised.
- a liquid film 7 b liquid film b
- the projector 4 exposes the liquid film 7b to photo-harden the liquid film 7b.
- another pattern 8b is formed on the pattern 8b.
- step (iii) and step (iv) Since the uncured photocurable resin composition A adheres to the three-dimensional modeled pattern obtained in step (iii) and step (iv), it is usually washed with a solvent.
- the three-dimensional modeling pattern obtained in step (iii) or step (iv) may be subjected to post-curing as necessary.
- Post-curing can be performed by irradiating the pattern with light.
- the conditions for light irradiation can be appropriately adjusted according to the type of the photocurable resin composition A and the degree of curing of the obtained pattern.
- Post-curing may be performed on a part of the pattern or may be performed on the entire pattern.
- Examples 1-28 and Comparative Examples 1-5 (1) Preparation of photocurable resin composition
- the components shown in Table 2 are mixed at the mass ratio shown in Table 3A, Table 3B, Table 4A, Table 4B, Table 5A, Table 5B, or Table 6, and stirred to 80 A uniform liquid mixture was prepared by heating in an oven at °C to dissolve the solid ingredients.
- photocurable resin compositions (A1 to A16 of Examples 1 to 16 and B1 to B5 of Comparative Examples 1 to 5) were prepared.
- the molecular weight of the oligomer in the table above is the weight average molecular weight Mw.
- OmniradTPOH and Omnirad 819 are acylphosphine oxide photoinitiators.
- Omnirad 184 is an alkylphenone photoinitiator.
- Example 22 Shore A hardness and relaxation stress Except for Example 22, a DLP (registered trademark) 3D printer (ML-48, manufactured by Mutoh Industries Co., Ltd.) was used, with an irradiation time of 30 seconds per layer and A strip-shaped sample (length 40 mm ⁇ width 20 mm ⁇ thickness (height) 4 mm) was produced under the condition of a z-axis (height direction) pitch of 100 ⁇ m. In Example 22, a sample was produced under the same conditions as above, except that an SLA (stereolithography) 3D printer (Lite 100, manufactured by UnionTech) was used. The Shore A hardness of the obtained sample was measured using a type A durometer under conditions of 23° C. and a load of 1 kg in accordance with JIS K6253:2012.
- SLA stereolithography
- TgA, TgB, elastic modulus, tan ⁇ , stress relaxation A photocurable resin composition is poured into a tray to prepare a liquid film with a thickness of 500 ⁇ m, and LED light is applied to both main surfaces of the liquid film.
- a sample of a cured product was produced by completely curing the liquid film by light irradiation.
- LED light in Example 22, LED light with a wavelength of 355 nm was used, and in the other examples and comparative examples, LED light with a wavelength of 405 nm was used.
- a tray that transmits the above LED light was used.
- the obtained sample was heated from -100°C to +300°C at a frequency of 1 Hz and a heating rate of 5°C/min using DMA (DMS6100, manufactured by Hitachi High-Tech Science Co., Ltd.). Then, the elastic modulus (storage modulus) (MPa) at 25 ° C. and 40 ° C. and tan ⁇ at 25 ° C. are obtained, and the temperature at which tan ⁇ peaks is measured for the cured product A of the photocurable resin composition A. It was determined as Tg (TgA, TgB). When tan ⁇ exceeded 0.2, there was stress relaxation, and when it was 0.2 or less, there was no stress relaxation.
- the Tg of the cured product of the reactive monomer alone and the cured product of the reactive oligomer alone Each Tg was obtained, and the weighted average of the obtained results was calculated to obtain Tg1 and Tg2 of the first compound and the second compound. Also, the difference between TgB and TgA ( ⁇ TBA), the difference between Tg2 and Tg1 ( ⁇ T21), and the absolute value of the difference between ⁇ T21 and ⁇ BA ( ⁇ (T21-TBA)) were determined.
- the HSP polarity term dp was calculated by entering the SMILES character string related to the chemical structure used in the software ChemDraw into the HSP calculation software HSPiP Calculate HSP.
- the polarity term dP (dPL) of the HSP of the first compound, the polarity term dP (dPH) of the HSP of the second compound and the absolute value of the difference between dPL and dPH ( ⁇ (dPL-dPH)) are shown in Tables 3A, 3B, Shown in Table 4A, Table 4B, Table 5A, Table 5B or Table 6.
- the cured product A of the photocurable resin composition A of the example showed stress relaxation as compared with the comparative example. Regardless of the presence or absence of , the elongation at break and breaking strength are high, and both excellent flexibility and high mechanical strength are achieved.
- the photocurable resin composition according to the above aspect of the present invention is suitable as a material for forming a three-dimensional stereolithographic object with a 3D printer or the like.
- stereolithographic objects are used in applications that require, for example, shock absorption, anti-vibration, and damping properties.
- the uses of the photocurable resin composition and the optical model are not limited to these.
- 1 stereolithography device
- 2 platform
- 2a pattern forming surface
- 3 resin tank
- 4 projector
- 5 photocurable resin composition
- 6 release agent layer
- 7a liquid film a
- 7b liquid Film b
- 8a two-dimensional pattern a
- 8b two-dimensional pattern b
- L light
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Abstract
Description
光造形物A(硬化物A)は、TgAおよびTgBを含む2つ以上のガラス転移点を有する。TgAは25℃未満である。TgBは25℃以上である。
光硬化性樹脂組成物Aは、三次元光造形用材料として用い得る光硬化性樹脂組成物であり、反応性化合物と、光重合開始剤と、を含む。そのため、本発明には、光硬化性樹脂組成物Aの三次元光造形用材料としての使用、および光硬化性樹脂組成物Aの三次元光造形への使用も包含される。反応性化合物および光重合開始剤は、三次元光造形によって得られる光造形物A(硬化物A)が、TgAおよびTgBを含む2つ以上のガラス転移点を有するように選択される。ただし、TgAは、25℃未満であり、TgBは、25℃以上である。また、反応性化合物および光重合開始剤は、三次元光造形によって得られる硬化物AのASTM D638に準拠した破断時伸びが130%以上(例えば、150%以上)となり、ASTM D638に準拠した破断強度が3MPa以上となるように選択される。
第1単官能モノマーおよび第2単官能モノマー(以下、まとめて単官能モノマーとも称する。)は、反応性モノマーの範疇に包含される。単官能モノマーは、反応性基を1つ有する。ただし、反応性化合物は、反応性モノマーとして、単官能モノマーに限らず、2つ以上の反応性基を有する多官能モノマーを含んでもよい。反応性モノマーとしては、光照射により発生したラジカル、カチオン、および/またはアニオンなどの作用により硬化または重合可能な化合物が使用される。
第1オリゴマーおよび第2オリゴマー(以下、まとめて単にオリゴマーとも称する。)は、反応性オリゴマーの範疇に包含される。反応性オリゴマーは、反応性基を1つ有する単官能オリゴマーでもよく、2つ以上の反応性基を有する多官能オリゴマーでもよい。反応性オリゴマーとしては、光照射により発生したラジカル、カチオンおよび/またはアニオンなどの作用により硬化または重合可能なオリゴマーが使用される。
オリゴマーを溶媒に溶解させて測定用試料を調製する。溶媒は、オリゴマーの種類に応じて、オリゴマーを溶解可能な液状媒体から選択される。測定用試料を用いて下記の条件でGPCを測定し、Mwを求める。
装置:SHODEX社製、SYSTEM-21H
検出器:RI検出器
移動相:テトラヒドロフラン
流量:1mL/分
カラム:SHODEX社製、 KD-806M(×3本)
カラム温度:40℃
基準物質:標準ポリスチレン(Mw=65000、5780、589)
光硬化性樹脂組成物Aに含まれる光重合開始剤は、光の作用により活性化して、光硬化性モノマーおよびオリゴマーの硬化(具体的には重合)を開始させる。光重合開始剤としては、例えば、光の作用によりラジカルを発生するラジカル重合開始剤のほか、光の作用により酸(またはカチオン)を生成するもの(具体的には、カチオン発生剤)が挙げられる。光重合開始剤は、一種を単独で用いてもよく、二種以上を組み合わせて用いてもよい。光重合開始剤は、重合性化合物のタイプ、例えば、ラジカル重合性であるか、カチオン重合性であるかなどに応じて選択される。ラジカル重合開始剤(ラジカル光重合開始剤)としては、例えば、アルキルフェノン系光重合開始剤、アシルホスフィンオキサイド系光重合開始剤などが挙げられる。
光硬化性樹脂組成物Aはセラミックス粒子を含んでもよい。セラミックス粒子は、硬化物Aの破断時伸びを向上させるとともに機械的強度を向上させる。セラミックス粒子は、通常表面に、無機性のヒドロキシ基などの官能基を有する。官能基が、水素結合等により、反応性モノマー、反応性オリゴマー、またはこれらの重合物と相互作用することで、疑似架橋点が形成される。
光硬化性樹脂組成物Aは、さらに、その他の公知の硬化性樹脂などを含んでもよい。また、光硬化性樹脂組成物Aは、チオール化合物、アミン化合物、公知の添加剤(例えば、着色剤、酸化防止剤、消泡材、充填剤、安定剤など)を含むことができる。
三次元光造形物は、例えば、光硬化性樹脂組成物Aの液膜を形成し、液膜を硬化させてパターンを形成する工程(i)と、パターンに接するように別の液膜を形成する工程(ii)と、パターン上の別の液膜を硬化させて別のパターンを積層する工程(iii)と、を含む製造方法により製造できる。
図1は、樹脂槽(バット)を備える光造形装置(パターニング装置)を用いて三次元造形物を形成する場合の一例である。図示例では、吊り下げ方式の造形について示したが、光硬化性樹脂組成物Aを用いて三次元光造形することができる方法であれば特に制限されない。また、光照射(露光)の方式についても特に制限されず、点露光でも、面露光でもよい。
工程(i)では、(a)に示すように、まず、樹脂槽3に収容された光硬化性樹脂組成物Aに、プラットフォーム2のパターン形成面2aを、プロジェクタ4(つまり、樹脂槽3の底面)に向けた状態で浸漬させる。このときに、パターン形成面2aとプロジェクタ4(または樹脂槽3の底面)との間に液膜7a(液膜a)が形成されるように、パターン形成面2a(またはプラットフォーム2)の高さを調整する。次いで、(b)に示すように、プロジェクタ4から液膜7aに向けて、光Lを照射(面露光)することで、液膜7aを光硬化させてパターン8a(パターンa)を形成する。
工程(ii)では、工程(i)で得られたパターンaと、光源との間に、光硬化性樹脂組成物Aを供給して、液膜(液膜b)を形成する。つまり、パターン形成面に形成されたパターンa上に液膜bを形成する。光硬化性樹脂組成物Aの供給は、工程(i)についての説明が参照できる。
工程(iii)では、工程(ii)で形成した液膜bに対して、光源から露光して、液膜bを光硬化させ、パターンaに別のパターン(液膜bの光硬化により得られるパターンb)を積層する。このようにパターンが厚み方向に積層されることで、三次元造形パターンを形成することができる。
光源や露光波長などは、工程(i)についての記載を参照できる。
第1工程は、工程(ii)と工程(iii)とを複数回繰り返す工程(iv)を含むことができる。この工程(iv)により、複数のパターンbが厚み方向に積層されることになり、さらに立体的な造形パターンが得られる。繰り返し回数は、所望する三次元造形物(三次元造形パターン)の形状やサイズなどに応じて適宜決定できる。
以下、本発明を実施例および比較例に基づいて具体的に説明するが、本発明は以下の実施例に限定されるものではない。
(1)光硬化性樹脂組成物の調製
表2に示す成分を表3A、表3B、表4A、表4B、表5A、表5B、または表6に示す質量比で混合し、攪拌しながら80℃のオーブンで加熱して、固形成分を溶解させることにより均一な液状の混合物を調製した。このようにして光硬化性樹脂組成物(実施例1~16のA1~A16および比較例1~5のB1~B5)を調製した。上記の表においてオリゴマーの分子量は重量平均分子量Mwである。OmniradTPOHおよびOmnirad819はアシルホスフィンオキサイド系光重合開始剤である。Omnirad184はアルキルフェノン系光重合開始剤である。
上記(1)で得られた光硬化性樹脂組成物または光硬化性樹脂組成物に用いた成分について以下の評価を行った。
E型粘度計(TVE-20H、東機産業(株))を用いて、25℃にて、20rpmの回転速度で光硬化性樹脂組成物の粘度を測定した。
実施例22以外については、DLP(登録商標)方式の3Dプリンタ(武藤工業(株)製、ML-48)を用いて、1層当たりの照射時間30秒およびz軸(高さ方向)のピッチ100μmの条件で、短冊状のサンプル(縦40mm×横20mm×厚み(高さ)4mm)を作製した。実施例22では、SLA(ステレオリソグラフィー)方式の3Dプリンタ(UnionTech製、Lite100)を用いる以外は、上記と同様の条件で、サンプルを作製した。得られたサンプルについて、タイプAデュロメーターを用い、23℃、荷重1kgの条件で、JIS K6253:2012に準拠して、ショアA硬度を測定した。
光硬化性樹脂組成物の液膜に、LED光を光照射して液膜を完全に硬化させることにより、既述の試験片を作製した。LED光としては、実施例22では波長355nmのLED光を用い、それ以外の実施例および比較例では波長405nmのLED光を用いた。得られた試験片を用いて、既述の条件下、ASTM D638に準拠して破断時伸び(%)および破断強度(MPa)を測定した。また、破断時伸び(%)および破断強度(MPa)を乗算して破断エネルギーを求めた。
トレイに、光硬化性樹脂組成物を注いで、厚み500μmの液膜を作製し、液膜の両方の主面に対して、LED光を光照射して液膜を完全に硬化させることにより、硬化物のサンプルを作製した。LED光としては、実施例22では波長355nmのLED光を用い、それ以外の実施例および比較例では波長405nmのLED光を用いた。トレイには、上記LED光を透過するものを用いた。
実施例17~28については、内側の直径が29mmの有底円筒形のトレイに、光硬化性樹脂組成物を注いで、厚み12.5mmの液膜を作製し、液膜の両方の主面に対して、LED光を光照射して液膜を完全に硬化させることにより、硬化物のサンプルを作製した。LED光としては、実施例22では波長355nmのLED光を用い、それ以外の実施例では波長405nmのLED光を用いた。トレイには、上記LED光を透過するものを用いた。得られた試験片を用いて、既述の手順で25℃における反発弾性率(%)を求めた。
Claims (24)
- 反応性化合物と、光重合開始剤と、を含む、光硬化性樹脂組成物であって、
前記光硬化性樹脂組成物の硬化物は、TgAおよびTgBを含む2つ以上のガラス転移点を有し、
前記TgAは、25℃未満であり、
前記TgBは、25℃以上であり、
前記光硬化性樹脂組成物の硬化物のASTM D638に準拠した破断時伸びは130%以上であり、
前記光硬化性樹脂組成物の硬化物のASTM D638に準拠した破断強度は3MPa以上である、光硬化性樹脂組成物。 - 三次元光造形用材料である、請求項1に記載の光硬化性樹脂組成物。
- 前記光硬化性樹脂組成物の硬化物の25℃における貯蔵弾性率は、500MPa以下である、請求項1または2に記載の光硬化性樹脂組成物。
- 前記破断強度は、5MPaを超える、請求項1~3のいずれか1項に記載の光硬化性樹脂組成物。
- 前記破断時伸びは、200%以上である、請求項1~4のいずれか1項に記載の光硬化性樹脂組成物。
- 前記TgAは、-30℃以下である、請求項1~5のいずれか1項に記載の光硬化性樹脂組成物。
- 前記TgBは、30℃以上である、請求項1~6のいずれか1項に記載の光硬化性樹脂組成物。
- 前記反応性化合物が、第1化合物と第2化合物とを含み、
前記第1化合物は、第1単官能モノマーおよび第1オリゴマーの少なくとも一方を含み、
前記第2化合物は、第2単官能モノマーおよび第2オリゴマーの少なくとも一方を含み、
前記反応性化合物は、前記第1単官能モノマーおよび前記第2単官能モノマーの少なくとも一方を含み、
前記第1化合物の硬化物のガラス転移点Tg1は、10℃以下であり、
前記第2化合物の硬化物のガラス転移点Tg2は、50℃以上である、請求項1~7のいずれか1項に記載の光硬化性樹脂組成物。 - 前記第1化合物の硬化物のガラス転移点Tg1は、-130℃以上である、請求項8に記載の光硬化性樹脂組成物。
- 前記第2化合物の硬化物のガラス転移点Tg2は、80℃以上である、請求項8または9に記載の光硬化性樹脂組成物。
- 前記第1単官能モノマーは、アクリル系モノマーであり、
前記第2単官能モノマーは、ビニル系モノマー、アクリル系モノマー、および重合性炭素-炭素不飽和結合を含む環状基を有するモノマーからなる群より選択される少なくとも一種である、請求項8~10のいずれか1項に記載の光硬化性樹脂組成物。 - 前記第1オリゴマーおよび前記第2オリゴマーは、アクリル系オリゴマーである、請求項8~11のいずれか1項に記載の光硬化性樹脂組成物。
- 前記第2化合物は、窒素含有モノマーを含む、請求項8~12のいずれか1項に記載の光硬化性樹脂組成物。
- 前記窒素含有モノマーは、窒素含有環を有するモノマーを含む、請求項13に記載の光硬化性樹脂組成物。
- 前記第2単官能モノマーは、前記窒素含有モノマーを含む、請求項13または14に記載の光硬化性樹脂組成物。
- 前記第1化合物と前記第2化合物との質量比は、20/80~85/15である、請求項8~15のいずれか1項に記載の光硬化性樹脂組成物。
- 前記第1化合物のハンセン溶解度パラメータ(HSP)の極性項dP1と、前記第2化合物のハンセン溶解度パラメータの極性項dP2との差は、5.0MPa0.5以上である、請求項8~16のいずれか1項に記載の光硬化性樹脂組成物。
- 25℃において200mPa・s以上、5,000mPa・s以下の粘度を有する、請求項1~17のいずれか1項に記載の光硬化性樹脂組成物。
- さらに、セラミックス粒子を含む、請求項1~18のいずれか1項に記載の光硬化性樹脂組成物。
- 前記セラミックス粒子の含有量は、1質量%以上、50質量%以下である、請求項19に記載の光硬化性樹脂組成物。
- 前記光硬化性樹脂組成物の硬化物の25℃における貯蔵弾性率と、前記光硬化性樹脂組成物の硬化物の40℃における貯蔵弾性率との差の絶対値が、前記25℃における貯蔵弾性率の20%以下である、請求項1~20のいずれか1項に記載の光硬化性樹脂組成物。
- 前記光硬化性樹脂組成物の硬化物の25℃における反発弾性率が、30%以上である、請求項1~21のいずれか1項に記載の光硬化性樹脂組成物。
- 請求項1~22のいずれか1項に記載の光硬化性樹脂組成物の光硬化物である三次元光造形物。
- 光硬化性樹脂組成物の硬化物であり、
前記光硬化性樹脂組成物の硬化物は、TgAおよびTgBを含む2つ以上のガラス転移点を有し、
前記TgAは、25℃未満であり、
前記TgBは、25℃以上であり、
前記硬化物のASTM D638に準拠した破断時伸びは130%以上であり、
前記硬化物のASTM D638に準拠した破断強度は3MPa以上である、三次元光造形物。
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