WO2023189929A1 - 紫外線硬化性シリコーン組成物 - Google Patents
紫外線硬化性シリコーン組成物 Download PDFInfo
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- WO2023189929A1 WO2023189929A1 PCT/JP2023/011185 JP2023011185W WO2023189929A1 WO 2023189929 A1 WO2023189929 A1 WO 2023189929A1 JP 2023011185 W JP2023011185 W JP 2023011185W WO 2023189929 A1 WO2023189929 A1 WO 2023189929A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/06—Preparatory processes
- C08G77/08—Preparatory processes characterised by the catalysts used
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/70—Siloxanes defined by use of the MDTQ nomenclature
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/56—Organo-metallic compounds, i.e. organic compounds containing a metal-to-carbon bond
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
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- H10W74/10—
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- H10W74/40—
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- H10W74/476—
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/12—Polysiloxanes containing silicon bound to hydrogen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
Definitions
- the present invention relates to an ultraviolet curable silicone composition, and particularly to an ultraviolet curable silicone composition, the cured product of which can be suitably used as a sealant for electrical parts, electronic parts, etc.
- Silicone compositions are used as electrical insulating sealants and the like because they have excellent heat resistance and can provide good adhesion and adhesion to these parts.
- ultraviolet-curable addition-reaction silicone compositions that utilize hydrosilylation reactions are widely used because they cure with short-term ultraviolet irradiation, have excellent productivity, and can bond parts together well. There is.
- Patent Document 1 describes (A) an organopolysiloxane having an average of 0.1 or more alkenyl groups bonded to a silicon atom in one molecule; An ultraviolet curable material for a damping material for an objective lens drive device, containing an organohydrogenpolysiloxane having two or more hydrogen atoms bonded to a silicon atom; and (C) a photoactivated platinum complex curing catalyst in a predetermined ratio.
- Organopolysiloxane gel compositions are disclosed and shown to be capable of combining certain polymer design advantages with rapid curing upon ultraviolet radiation.
- Patent Document 2 describes (A) an organopolysiloxane having a viscosity of 50 to 100,000 mPa ⁇ s at 25°C and containing at least two alkenyl groups in one molecule; (B) an organopolysiloxane containing at least two alkenyl groups in one molecule; Organohydrogenpolysiloxane such as linear organohydrogenpolysiloxane having hydrogen atoms (Si-H groups) only at both ends of the molecular chain; and (C) one or more types of light selected from a specific group of compounds.
- An ultraviolet curable liquid silicone composition for image display devices that contains an active hydrosilylation reaction catalyst in a predetermined ratio and has a predetermined viscosity is disclosed, and the UV-curable liquid silicone composition contains an active hydrosilylation reaction catalyst in a predetermined ratio and has a predetermined viscosity. It has been shown that it is possible to cure the product using a method of curing, and that it provides a cured product with good mechanical and optical properties.
- Patent Document 3 discloses a curing method that includes a step of irradiating a composition with light having a specific emission spectrum and then heating it for the purpose of curing the composition while maintaining its initial shape upon heating.
- Patent Document 4 describes a first method of increasing the catalytic activity of a photoactivated platinum complex curing catalyst by irradiating the composition with ultraviolet rays for the purpose of uniformly curing even parts that are not exposed to light or thick molded products.
- a method for curing a composition is disclosed, which comprises a step and a second step of applying and curing the composition obtained in the first step to a desired location.
- the ultraviolet curable silicone compositions disclosed in Patent Documents 1 and 2 are cured by ultraviolet irradiation and exhibit predetermined mechanical properties and optical properties, but the curability is poor in areas not exposed to light and in the thickness direction. There was a problem that the quality of the cured product was unstable. Furthermore, since the curing methods disclosed in Patent Documents 3 and 4 require additional equipment and are complicated to operate, it is not possible to produce cured products with stable quality without using these methods. There is a need for ultraviolet curable silicone compositions that provide UV curable silicone compositions.
- An object of the present invention is to provide an ultraviolet curable silicone composition that has excellent curability in areas not exposed to light and in the thickness direction.
- the present inventors have conducted extensive research, and as a result, the inventors have found that using a predetermined alkenyl group-containing polyorganosiloxane and a polyorganohydrogensiloxane, the amount of the platinum-based catalyst is adjusted to a predetermined amount. It has been discovered that the curability of the composition can be improved by setting the amount within this range, and the present invention has been achieved.
- the present invention relates to the following [1] to [11].
- [1] A polyorganosiloxane having at least two alkenyl groups in one molecule and having an average alkenyl group content of 0.08 mmol/g or more;
- (B) At least three alkenyl groups in one molecule a polyorganohydrogensiloxane having a hydrogen atom bonded to a silicon atom; and
- the amount of component (C) in the composition is 8 to 400 ppm as platinum metal mass
- the viscosity of the composition at 23 ° C. is 10 to 10,000 mPa ⁇ s
- the composition The cured product obtained by irradiating the object with ultraviolet rays with a diameter of 7.0 mm, an illuminance of 100 mW/cm 2 and a wavelength of 365 nm for 45 seconds in a yellow room and storing it at 23° C. for 16 hours at a depth of 1.8 mm.
- An ultraviolet curable silicone composition having a cured diameter of 10.8 mm or more.
- Component (A) contains a linear polyorganosiloxane, and the alkenyl group content of component (A) is 0.09 to 1.8 mmol/g on average, according to [1].
- UV curable silicone composition [3] The ultraviolet curable silicone composition according to [1] or [2], wherein the content of component (C) in the composition is 40 to 350 ppm as platinum metal mass. [4]
- the component (B1) is a polyorganohydrogensiloxane to which 3 to 6 SiO 4/2 units and 6 to 12 R c1 2 HSiO 1/2 units are bonded [1] to The ultraviolet curable silicone composition according to any one of [3].
- component (C) is a platinum-based catalyst having a cyclic diene compound as a ligand.
- the ratio of the number of moles H B of hydrogen atoms bonded to silicon atoms in component (B) to the number Vi A of moles of alkenyl groups in component (A), the H B /Vi A ratio is 0.30 to 3. 5.
- a sealing material comprising a cured product of the ultraviolet curable silicone composition according to any one of [1] to [6].
- the sealing material according to [9] which is used for electrical components or electronic components.
- an ultraviolet curable silicone composition is provided that has excellent curability in areas not exposed to light and in the thickness direction.
- FIG. 1 is a photograph taken from above of a device for measuring cured diameter in a yellow room.
- FIG. 2 is a schematic diagram of the apparatus of FIG. 1 viewed from above.
- FIG. 3 is a cross-sectional view taken along the line A-A' in FIG.
- FIG. 4 is a schematic diagram illustrating the cured area and cured diameter after irradiation with ultraviolet rays in FIGS. 2 and 3.
- FIG. 5 is a graph showing the relationship between the platinum content and the hardening diameter at the top surface (depth 0 mm) and bottom surface (depth 1.8 mm) for Examples 1 to 10 and Comparative Example 5.
- FIG. 6 is a graph showing the relationship between the platinum content and the hardened area of the non-irradiated part on the top surface (depth 0 mm) and bottom surface (depth 1.8 mm) for Examples 1 to 10 and Comparative Example 5. .
- the ultraviolet curable silicone composition includes (A) a polyorganosiloxane having at least two alkenyl groups in one molecule and having an average alkenyl group content of 0.08 mmol/g or more; (B) one molecule a polyorganohydrogensiloxane having at least three silicon-bonded hydrogen atoms therein; and (C) a platinum-based catalyst activated by ultraviolet rays, the component (B) being (B1) R c1 2 HSiO 1 /2 units (wherein R c1 is independently a C 1 -C 6 alkyl group or a C 6 -C 20 aryl group) and a SiO 4/2 unit,
- the content of component (C) in the composition is 8 to 400 ppm as platinum metal mass, the viscosity of the composition at 23°C is 10 to 10,000 mPa ⁇ s, and the composition is For a cured product obtained by irradiating ultraviolet rays with a diameter of 7.0 mm, an illuminance of
- organic group means a group containing carbon.
- the valence of the organic group is indicated by the expression “n-valent” where n is an arbitrary natural number. Therefore, for example, a “monovalent organic group” means a carbon-containing group having only one bond. The bond may be possessed by an element other than carbon. Even if the valence is not specified, those skilled in the art can understand the appropriate valence from the context.
- hydrocarbon group refers to a group containing carbon and hydrogen, from which at least one hydrogen atom has been removed from the molecule.
- Such hydrocarbon groups are not particularly limited, but examples of hydrocarbon groups that may be substituted with one or more substituents include hydrocarbon groups having 1 to 20 carbon atoms, such as Examples include aliphatic hydrocarbon groups and aromatic hydrocarbon groups.
- the above-mentioned "aliphatic hydrocarbon group” may be linear, branched, or cyclic, and may be saturated or unsaturated.
- the hydrocarbon group may also contain one or more ring structures.
- such a hydrocarbon group has one or more nitrogen atoms (N), oxygen atoms (O), sulfur atoms (S), silicon atoms (Si), amide bonds, sulfonyl atoms at the terminal or in the molecular chain. It may have a heteroatom or a structure containing a heteroatom, such as a bond, a siloxane bond, a carbonyl group, or a carbonyloxy group.
- the substituent of the "hydrocarbon group” is not particularly limited, but includes, for example, a halogen atom; a C 1-6 alkyl which may be substituted with one or more halogen atoms. group, C 2-6 alkenyl group, C 2-6 alkynyl group, C 3-10 cycloalkyl group, C 3-10 unsaturated cycloalkyl group, 5-10 membered heterocyclyl group, 5-10 membered unsaturated heterocyclyl group C 6-10 aryl groups and 5- to 10-membered heteroaryl groups.
- an alkyl group and a phenyl group may be unsubstituted or substituted unless otherwise specified.
- Substituents for such groups are not particularly limited, but for example, one or more groups selected from a halogen atom, a C 1-6 alkyl group, a C 2-6 alkenyl group, and a C 2-6 alkynyl group. Can be mentioned.
- the siloxane compound can have various three-dimensional structures depending on the T unit or Q unit.
- Component (A) is a polyorganosiloxane having at least two alkenyl groups in one molecule and having an average alkenyl group content of 0.08 mmol/g or more.
- Component (A) functions as a base polymer of the ultraviolet curable silicone composition.
- the alkenyl group may be bonded to the end of the molecular main chain, to a side chain in the middle of the molecular chain, or to both.
- the molecular main chain refers to the relatively longest bond chain in the molecule.
- component (A) is not particularly limited as long as the main skeleton is a siloxane bond, and may be linear, branched, cyclic, or three-dimensional network, and the siloxane skeleton is divalent. may be interrupted by an organic group.
- Component (A) may be used alone or in combination of two or more.
- Component (A) has at least two alkenyl groups in one molecule.
- Component (A) can be a mixture of a plurality of polyorganosiloxanes having at least two alkenyl groups in one molecule.
- component (A) preferably contains a linear polyorganosiloxane, and the main chain of the molecule It is more preferable to include a linear polyorganosiloxane having one alkenyl group at both ends.
- component (A) preferably contains linear polyorganosiloxane in an amount of 30% by mass or more, more preferably 50% by mass or more, and 80% by mass or more based on 100% by mass of component (A). It is even more preferable to include.
- the upper limit of the content of linear polyorganosiloxane based on 100% by mass of component (A) is 100% by mass.
- the alkenyl group is not particularly limited as long as it has a carbon-carbon double bond and is capable of an addition reaction.
- the alkenyl group preferably has 2 to 20 carbon atoms, more preferably 2 to 8 carbon atoms, and even more preferably 2 to 6 carbon atoms.
- the alkenyl group may have a branched structure or a ring structure.
- the carbon-carbon double bond in the hydrocarbon constituting the alkenyl group can be positioned at any position. From the viewpoint of reactivity, the carbon-carbon double bond is preferably located at the end of the group.
- a preferable example of the alkenyl group is a vinyl group because polyorganosiloxane can be easily synthesized.
- the alkenyl group content of component (A) is on average 0.08 mmol/g or more, preferably 0.08 to 11.0 mmol/g, and 0.09 to 5.0 mmol/g. is more preferable, more preferably 0.09 to 1.8 mmol/g, particularly preferably 0.1 to 0.5 mmol/g.
- the alkenyl group content of component (A) is the average value of the mixture.
- component (A) has at least two silicon-bonded alkenyl groups in one molecule.
- Component (A) forms a network structure through an addition reaction with a hydrosilyl group (Si--H group) of component (B), which will be described later.
- Component (A) typically has the general formula (1): R 1 m R 2 n SiO (4-m-n)/2 (1) (In the formula, R 1 is an unsubstituted or substituted monovalent hydrocarbon group having no aliphatic unsaturated bond; R 2 is an alkenyl group; m is an integer from 0 to 2; n is an integer from 1 to 3, provided that m+n is from 1 to 3. ) It has at least two alkenyl group-containing siloxane units represented by the formula in the molecule.
- R 1 is an unsubstituted or substituted monovalent hydrocarbon group having no aliphatic unsaturated bond.
- R 1 specifically represents an alkyl group, such as a C 1 -C 6 alkyl group (eg, methyl, ethyl, propyl, etc.); a cycloalkyl group, such as a C 3 -C 10 cycloalkyl group (eg, cyclohexyl, etc.)
- Aryl groups such as C 6 to C 20 aryl groups (e.g., phenyl, tolyl, xylyl, naphthyl, anthracenyl, etc.); Aralkyl groups, such as C 7 to C 13 aralkyl groups (e.g., 2-phenylethyl, 2-phenylpropyl); etc.); substituted hydrocarbon groups, such as halogen-substituted hydrocarbon groups (eg, chloromethyl, chlorophenyl, 3,3,3-triflu
- alkyl groups are preferred, with methyl, ethyl and propyl being particularly preferred, and methyl being more preferred.
- an aryl group can be used in combination, and among them, phenyl is preferred from the viewpoint of ease of synthesis.
- component (A) may contain a linear polyorganosiloxane having one alkenyl group at each end of the main chain of the molecule.
- the linear polyorganosiloxane has the formula (I): (In the formula, R a1 is independently a C 2 -C 6 alkenyl group; R b1 is independently a C 1 -C 6 alkyl group or a C 6 -C 20 aryl group, n1 is a number that makes the alkenyl group content of the linear polyorganosiloxane 0.08 mmol/g or more on average.
- Examples of the C 2 -C 6 alkenyl group include a vinyl group, an allyl group, a 3-butenyl group, and a 5-hexenyl group.
- Examples of the C 1 -C 6 alkyl group include methyl group, ethyl group, propyl group, butyl group, pentyl group, and hexyl group.
- Examples of the C 6 -C 20 aryl group include phenyl group, naphthyl group, and anthracenyl group.
- R a1 is preferably a vinyl group because it is easy to synthesize and does not impair the fluidity of the composition before curing and the heat resistance of the cured product.
- R b1 is preferably a C 1 -C 6 alkyl group, particularly preferably a methyl group, from the viewpoints of easy synthesis and excellent balance of fluidity of the composition, mechanical strength of the cured product, etc. Therefore, component (A) is preferably a polymethylvinylsiloxane in which both ends are blocked with dimethylvinylsiloxane units and the intermediate unit is a dimethylsiloxane unit.
- the content of polymethylvinylsiloxane whose both ends are blocked with dimethylvinylsiloxane units and whose middle unit is a dimethylsiloxane unit in 100% by mass of component (A) is preferably 30% by mass or more, and 50% by mass. % or more, and even more preferably 80% by mass or more.
- the upper limit of the content is 100% by mass.
- n1 is an average alkenyl group content of the linear polyorganosiloxane of 0.08 mmol/g or more from the viewpoint of ensuring stable liquid properties of the composition and curability in areas not exposed to light and in the thickness direction.
- the number is preferably 0.08 to 11.0 mmol/g, more preferably 0.09 to 5.0 mmol/g, and 0.09 to 1.8 mmol More preferably, the number is 0.1 to 0.5 mmol/g, and particularly preferably 0.1 to 0.5 mmol/g.
- the viscosity of component (A) was determined using a rotational viscometer according to JIS K 6249. This is a value measured under the conditions of 1, 2, 3, or 4 rotors, 60 rpm, and 23°C.
- Component (A) consists of a polymethylvinylsiloxane whose both ends are blocked with dimethylvinylsiloxane units and whose middle unit is a dimethylsiloxane unit, and other linear, branched, or cyclic alkenyl group-containing polyorganosiloxanes. It may be a mixture.
- component (A) commercially available products can be used. Furthermore, polyorganosiloxane into which alkenyl groups have been introduced by a known reaction may be used. As component (A), only one type of compound may be used, or a mixture of two or more types of compounds may be used, classified according to the position or type of substituent, degree of polymerization, etc. Since component (A) is a polyorganosiloxane, it may be a mixture of polyorganosiloxanes having various degrees of polymerization.
- the blending amount of component (A) is preferably 70.0 to 99.8% by mass based on 100% by mass of the ultraviolet curable silicone composition. , more preferably 80.0 to 99.7% by mass, and even more preferably 90.0 to 99.7% by mass.
- Component (B) is a polyorganohydrogensiloxane having at least three silicon-bonded hydrogen atoms in one molecule.
- Component (B) functions as a crosslinking agent and forms a network structure through an addition reaction with the alkenyl group of component (A).
- the hydrogen atom of component (B) may be bonded to the silicon atom at the end of the molecular chain, to the silicon atom in the middle of the molecular chain, or to both.
- the molecular structure of component (B) is not particularly limited as long as the main skeleton is a siloxane bond, and may be linear, branched, cyclic, or three-dimensional network, and the siloxane skeleton is divalent. may be interrupted by an organic group.
- the component (B) may have a hydroxyl group or an alkoxy group such as a methoxy group or an ethoxy group bonded to a silicon atom.
- Component (B) may be used alone or in combination of two or more.
- Component (B) typically has the general formula (2): R 3 p H q SiO (4-p-q)/2 (2)
- R 3 is an unsubstituted or substituted monovalent hydrocarbon group having no aliphatic unsaturated bond; p is an integer from 0 to 2; q is an integer from 1 to 3, provided that p+q is from 1 to 3.
- the molecule contains at least three siloxane units containing hydrogen atoms bonded to silicon atoms. Examples of R 3 include the same ones as R 1 in general formula (1), and preferred embodiments are also the same.
- the number of hydrogen atoms bonded to silicon atoms in one molecule is preferably 3 to 100, more preferably 5 to 50.
- Component (B) comprises (B1) R c1 2 HSiO 1/2 units (wherein R c1 is independently a C 1 -C 6 alkyl group or a C 6 -C 20 aryl group) and SiO 4 /2 units.
- the present inventors have discovered that by including component (B1) in component (B), when the composition is irradiated with ultraviolet rays, not only the irradiated range but also the range is three-dimensionally expanded. It has been found that a composition with excellent curability can be obtained even in areas not exposed to light around the irradiated area and in the thickness direction.
- the component (B1) may have a branched, cyclic, or three-dimensional network structure (a structure in which SiO 4/2 units are densely packed).
- R c1 is preferably a C 1 -C 6 alkyl group, and particularly preferably methyl.
- component (B1) is preferably a polyorganohydrogensiloxane in which 3 to 6 SiO 4/2 units and 6 to 12 R c1 2 HSiO 1/2 units are bonded; [ R c1 2 HSiO 1/2 ] 6 [SiO 4/2 ] 3 , [R c1 2 HSiO 1/2 ] 8 [SiO 4/2 ] 4 , [R c1 2 HSiO 1/2 ] 10 [SiO 4/2 ] 5 , [R c1 2 HSiO 1/2 ] 12 [SiO 4/2 ] 6 , 3 to 6 SiO 4/2 units form a cyclic siloxane skeleton, and each SiO 4/2 unit has 2 Particular preference is given to cyclic polyorganohydrogensiloxanes in which R c1 2 HSiO 1/2 units are bonded.
- the viscosity of component (B) at 23°C is preferably 1 to 100 mPa ⁇ s, more preferably 1 to 50 mPa ⁇ s.
- the viscosity was determined using a rotational viscometer according to JIS K 6249. This is a value measured under the conditions of 1 or 2 rotors, 60 rps, and 23°C.
- component (B) commercially available products can be used. Moreover, component (B) can also be synthesized by a known reaction. As component (B), only one type of compound may be used, or a mixture of two or more types of compounds may be used, classified according to the position or type of substituent, degree of polymerization, etc. Since component (B) is a polyorganohydrogensiloxane, it may be a mixture of polyorganohydrogensiloxanes having various degrees of polymerization.
- the B /Vi A ratio is preferably 0.30 to 3.5, more preferably 0.30 to 3.0, even more preferably 0.40 to 2.0, and even more preferably 0.30 to 3.5. It is even more preferably from 45 to 1.1, and particularly preferably from 0.50 to 1.0.
- Component (C) is a catalyst that is activated by ultraviolet light to promote the addition reaction between the alkenyl group of component (A) and the hydrosilyl group (Si--H group) of component (B). From the viewpoint of good catalytic activity, component (C) is preferably a platinum-based catalyst having a cyclic diene compound as a ligand. Component (C) may be used alone or in combination of two or more.
- platinum-based catalysts having a cyclic diene compound as a ligand include (1,5-cyclooctadienyl)diphenylplatinum complex, (1,5-cyclooctadienyl)dipropylplatinum complex, and (2,5-norboradiene).
- Dimethylplatinum complex (2,5-norboradiene)diphenylplatinum complex, (cyclopentadienyl)dimethylplatinum complex, (methylcyclopentadienyl)diethylplatinum complex, (trimethylsilylcyclopentadienyl)diphenylplatinum complex, (methylcyclo Oct-1,5-dienyl)diethylplatinum complex, (cyclopentadienyl)trimethylplatinum complex, (cyclopentadienyl)ethyldimethylplatinum complex, (cyclopentadienyl)acetyldimethylplatinum complex, (methylcyclopentadienyl) ) Trimethylplatinum complex, (methylcyclopentadienyl)trihexylplatinum complex, (trimethylsilylcyclopentadienyl)trimethylplatinum complex, (dimethylphenylsilylcyclopentadienyl)
- the amount of component (C) in the ultraviolet curable silicone composition is such that the mass of platinum metal is 8 to 400 ppm. If the blending amount of component (C) is less than 8 ppm in terms of platinum metal mass, the curing properties will be poor in the areas around the ultraviolet irradiated area that are not exposed to light and in the thickness direction. When the amount of component (C) exceeds 400 ppm as platinum metal mass, storage stability of the ultraviolet curable silicone composition tends to deteriorate and yellowing of the cured product tends to occur, resulting in high costs.
- the amount of component (C) in the ultraviolet curable silicone composition is preferably 30 to 350 ppm, more preferably 37 to 350 ppm, even more preferably 40 to 350 ppm, as platinum metal mass.
- the blending amount of component (C) relative to the total mass of components (A) and (B) is preferably such that the mass of platinum metal is 8 to 400 ppm, more preferably 30 to 350 ppm. , more preferably from 37 to 350 ppm, even more preferably from 40 to 350 ppm, particularly preferably from 70 to 340 ppm.
- the ultraviolet curable silicone composition may contain other components as long as they do not impair its purpose or effect.
- Other ingredients include flame retardants, adhesion agents, heat resistance agents, diluents, thixotropic agents such as fumed silica, inorganic or organic pigments, addition reaction curing catalyst inhibitors, and resins other than polyorganosiloxane. etc. can be blended as appropriate.
- the ultraviolet curable silicone composition includes a polyorganosiloxane other than the component (A), such as a polyorganosiloxane having one or less alkenyl group in one molecule; a polyorganohydrogensiloxane other than the component (B); For example, polyorganohydrogensiloxane having one or two silicon-bonded hydrogen atoms in one molecule can be blended.
- the other components may be used alone or in combination of two or more.
- the ultraviolet curable silicone composition can be obtained by mixing components (A) to (C) and, if necessary, other components using a mixer such as a planetary mixer. At the time of mixing, the mixture may be heated at a temperature in the range of 50 to 150° C. if necessary.
- a mixer such as a planetary mixer.
- the ultraviolet curable silicone composition contains powder, it is preferable to perform the kneading operation under high shear force in order to achieve a uniform finish.
- the kneading device include a three-roll mill, a colloid mill, and a sand grinder, among which a method using three rolls is preferred.
- the ultraviolet curable silicone composition can also be made into a two-pack type composition in consideration of the storage stability of the composition.
- the first part contains components (A) and (C) and does not contain the (B) component; the second part contains the (B) component and does not contain the (C) component. It is preferable not to include it.
- the first part and the second part are prepared separately.
- the first agent and the second agent can be manufactured by the same method as the one-component composition.
- the viscosity of the ultraviolet curable silicone composition at 23° C. is 10 to 10,000 mPa ⁇ s. By setting the viscosity of the composition within the above range, it is possible to have excellent handling properties and to improve the curability in the thickness direction and in the areas not exposed to light around the part irradiated with ultraviolet rays.
- the viscosity of the ultraviolet curable silicone composition at 23° C. is preferably 20 to 5,000 mPa ⁇ s, more preferably 100 to 2,000 mPa ⁇ s.
- the viscosity of the first part and the second part is preferably 10 to 20,000 mPa ⁇ s, More preferably, it is 20 to 10,000 mPa ⁇ s, particularly preferably 100 to 5,000 mPa ⁇ s.
- the viscosity was determined using a rotational viscometer according to JIS K 6249. This is a value measured under the conditions of 1, 2, 3, or 4 rotors, 60 rpm, and 23°C.
- the ultraviolet curable silicone composition is preferably stored at a temperature below room temperature, protected from light.
- the ultraviolet curable silicone composition can be cured by irradiation with ultraviolet light.
- the irradiation amount is preferably 100 to 10,000 mJ/cm 2 , more preferably 300 to 6,000 mJ/cm 2 , and still more preferably 500 to 5,000 mJ/cm 2 .
- the irradiation amount is a measured value of UVA.
- UVA refers to ultraviolet light in the range of 315 to 400 nm.
- the composition has good curability when irradiated with ultraviolet light having a wavelength of ultraviolet light, for example, in the range of 250 to 450 nm.
- Examples of light sources that emit ultraviolet light of such wavelengths include a high-pressure mercury lamp (UV-7000) manufactured by USHIO INC., a metal halide lamp (UVL-4001M3-N1), and a metal halide lamp (JM -MTL 2KW), UV irradiation lamp manufactured by Mitsubishi Electric Corporation (OSBL360), UV irradiation machine manufactured by GS Yuasa Corporation (UD-20-2), fluorescent lamp manufactured by Toshiba Corporation (FL-20BLB)), Heraeus Examples include H bulb, H plus bulb, V bulb, D bulb, Q bulb, and M bulb manufactured by Co., Ltd., and an LED lamp (HLDL-155UV) manufactured by CCS Corporation.
- UV-7000 high-pressure mercury lamp
- UVL-4001M3-N1 UV halide lamp
- JM -MTL 2KW metal halide lamp
- UV irradiation machine manufactured by GS Yuasa Corporation GS Yuasa Corporation
- the curing time of the composition depends on the amount of ultraviolet irradiation, it is generally 30 minutes or less, preferably 10 minutes or less. Whether or not the curing of the composition has progressed can be determined by visual observation, but the time taken until the storage modulus G' and loss modulus G'' become equal, and until the storage modulus G' reaches a predetermined value. It can also be quantitatively evaluated based on the time, etc. For example, the time it takes for the storage modulus G' to become equal to the loss modulus G'' at 23°C after irradiation with ultraviolet rays is within 30 minutes, preferably 10 minutes. If it is within this range, it can be said that the time required for curing is short and the handleability is excellent, so it is preferable.
- the ultraviolet curable silicone composition has excellent curability in areas not exposed to light and in the thickness direction. Specifically, an ultraviolet curable silicone composition was irradiated with ultraviolet light having a diameter of 7.0 mm, an illuminance of 100 mW/cm 2 , and a wavelength of 365 nm for 45 seconds in a yellow room, and then stored at 23° C. for 16 hours.
- the cured product has a cured diameter of 10.8 mm or more at a depth of 1.8 mm.
- the cured diameter is preferably 11.0 mm or more, more preferably 12.0 mm or more, and even more preferably 13.0 mm or more.
- FIG. 1 is a photograph of an apparatus for measuring a cured diameter taken from above in a yellow room
- FIG. 2 is a schematic diagram of the apparatus viewed from above
- FIG. 3 is a cross-sectional view taken along the line AA' in FIG.
- FIG. 4 is a schematic diagram illustrating the cured area and cured diameter after irradiation with ultraviolet rays in FIGS. 2 and 3.
- a yellow room refers to an environment in which light with a wavelength of 500 nm or less, including ultraviolet rays, is blocked, and specifically, it refers to an environment in which 98% or more of wavelengths of 500 nm or less are cut from light from fluorescent lamps.
- a yellow room is generally provided, for example, when photosensitive materials are handled in a clean room of a semiconductor factory.
- a yellow room can be created by using a windowless room and using a commercially available yellow fluorescent lamp for lighting.
- Examples of commercially available yellow fluorescent lamps include yellow light straight tube LED lamps manufactured by Toshiba Corporation.
- a metal mold 6 having a rectangular parallelepiped depression 1 (within the broken line in FIGS. 2 and 3) with a length of 60 mm, a width of 25 mm, and a depth of 2.0 mm is prepared.
- a black bottom tape 4 (thickness: 0.2 mm) is attached to the entire bottom surface of the recess 1.
- the sample 7 installed in this manner was irradiated with ultraviolet rays with an illuminance of 100 mW/cm 2 and a wavelength of 365 nm for 45 seconds through the hole 2 using a UV-LED irradiator manufactured by CCS Co., Ltd. (irradiation amount 4,500 mJ/cm 2 ). After that, store at 23°C for 16 hours.
- Sample 7 is cured in a cured region 8, as shown in FIG.
- the upper black tape 5 is removed, the metal mold 6 is placed against it, the uncured portion is removed, and the maximum diameter of each of the cured upper and lower surfaces is measured with a caliper and determined as the cured diameter.
- a cured product of an ultraviolet curable silicone composition has excellent adhesiveness and transparency, and therefore can be suitably used as a potting material.
- the ultraviolet curable silicone composition can be suitably used for materials having portions that are difficult to be exposed to light, especially potting materials for connector pins.
- the cured product of the ultraviolet curable silicone composition can be suitably used as a sealant.
- Articles using a cured product of an ultraviolet curable silicone composition as a sealant have excellent water resistance and durability on the adhesive surface and sealing area, so the cured product can be used for sealing electrical or electronic components. It can be suitably used as a material.
- the ultraviolet curable silicone composition has excellent curability in the area around the area irradiated with ultraviolet rays that is not exposed to light and in the thickness direction, and the quality of the cured product is stable. Therefore, it can be used, for example, as an adhesive for bonding image display devices such as liquid crystal, plasma, and organic EL, or as a sealant for sealing LED elements or OLED elements.
- a sealing material containing a cured product of an ultraviolet curable silicone composition can be suitably used for electrical or electronic parts, and is particularly suitable for connectors having connector pins.
- the display is in parts by weight or % by weight unless otherwise specified.
- (A') Component Polyorganosiloxane having at least two alkenyl groups in one molecule and having an average alkenyl group content of less than 0.08 mmol/g M Vi D m3 M Vi (3): Vinyl Group content is 0.047 mmol/g on average, viscosity at 23°C: 13,000 mPa ⁇ s M Vi D m4 M Vi (4): Vinyl group content is 0.029 mmol/g on average, viscosity at 23°C: 78,000 mPa ⁇ s
- Example 1 Preparation of the composition was carried out in a yellow room.
- Component (C) was diluted to 1.0% by mass with M Vi D m1 M Vi (1). 91.30 parts by mass of M Vi D m1 M Vi (1) and 5.50 parts by mass of the diluted solution of the component (C) (component (C): 0.055 parts by mass, M Vi D m1 M Vi (1) :5.445 parts by mass) and 3.20 parts by mass of component (B) were added and mixed to obtain the ultraviolet curable silicone composition of Example 1.
- Examples 2 to 14 Ultraviolet curable silicone compositions of Examples 2 to 14 were obtained in the same manner as in Example 1, except that the components (A) to (C) and their blending amounts were changed as shown in Table 1.
- Comparative examples 1 to 15 Ultraviolet curable compositions of Comparative Examples 1 to 15 were obtained in the same manner as in Example 1, except that each component and its blending amount were changed as shown in Table 2.
- the ultraviolet curable silicone composition was irradiated with ultraviolet rays at an illuminance of 100 mW/cm 2 for 45 seconds (irradiation dose 4,500 mJ/cm 2 ), and from the start of irradiation until the storage modulus G' became equal to the loss modulus G''.
- the time was taken as the gelation time. The shorter the gelation time, the faster the curing property, and it was judged that the curing property was excellent.
- the gelation time was measured until 60 minutes after the start of ultraviolet irradiation, and the storage When the elastic modulus G' was less than the loss elastic modulus G'', it was regarded as "uncured". The results are shown in Tables 3 and 4.
- FIG. 1 is a photograph taken from above in a yellow room of the apparatus for making the above measurements
- FIG. 2 is a schematic diagram of the apparatus viewed from above.
- FIG. 3 is a cross-sectional view taken along the line AA' in FIG.
- FIG. 4 is a schematic diagram illustrating the cured area and cured diameter after irradiation with ultraviolet rays in FIGS. 2 and 3.
- a metal mold 6 having a rectangular parallelepiped depression 1 (within the broken line in FIGS. 2 and 3) with a length of 60 mm, a width of 25 mm, and a depth of 2.0 mm was prepared.
- a black bottom tape 4 (thickness: 0.2 mm) was attached to the entire bottom surface of the recess 1.
- each of the samples 7 compositions of the example and comparative example
- a black tape 5 (thickness 0.2 mm) for the upper part having a hole 2 with a diameter of 7.0 mm was applied. It was attached to cover the top of the composition.
- the sample 7 installed in this manner was irradiated with ultraviolet rays with an illuminance of 100 mW/cm 2 and a wavelength of 365 nm for 45 seconds through the hole 2 using a UV-LED irradiator manufactured by CCS Co., Ltd. (irradiation amount 4,500 mJ/cm 2 ). After that, it was stored at 23°C for 16 hours.
- Sample 7 is cured in a cured region 8, as shown in FIG.
- the black upper tape 5 was removed, the metal mold 6 was placed against it, the uncured portion was removed, and the maximum diameter of each of the cured upper and lower surfaces was measured with a caliper and defined as the cured diameter.
- the cured diameter is more than 7.0 mm for the top surface and 10.8 mm or more for the bottom surface, it is judged that the cure property is excellent in the areas around the UV irradiated area that are not exposed to light and in the thickness direction. did. In addition, when the composition was not cured by ultraviolet irradiation, it was classified as "uncured”. The results are also shown in Tables 3 and 4.
- the cured area of the non-irradiated area was calculated as an indicator of the extent to which the composition could be cured beyond the range where the ultraviolet rays were irradiated.
- the total cured area of the upper and lower surfaces of Sample 7 was calculated from the cured diameter. Therefore, the difference between the total cured area of the upper and lower surfaces and the ultraviolet irradiation area (area of hole 2) was defined as the cured area of the non-irradiated part. The results are shown in Tables 3 and 4.
- a UV-curable silicone composition comprising: a polyorganohydrogensiloxane having at least three silicon-bonded hydrogen atoms; and (C) a platinum-based catalyst that is activated by UV radiation, wherein component (B) is a polyorganohydrogensiloxane; , (B1) R c1 2 HSiO 1/2 units (wherein R c1 is independently a C 1 -C 6 alkyl group or a C 6 -C 20 aryl group) and a SiO 4/2 unit.
- the composition contains polyorganohydrogensiloxane, the amount of component (C) in the composition is 8 to 400 ppm as platinum metal mass, and the viscosity of the composition at 23 ° C. is 10 to 10,000 mPa s.
- the ultraviolet curable silicone compositions of Examples had short gelation times, excellent curability, and excellent curability in areas not exposed to light and in the thickness direction.
- FIG. 5 is a graph showing the relationship between the platinum content and the hardening diameter on the upper surface (depth 0 mm) and lower surface (depth 1.8 mm) of sample 7 for Examples 1 to 10 and Comparative Example 5.
- FIG. 6 is a graph showing the relationship between the platinum content and the hardened area of the non-irradiated portion on the upper and lower surfaces of sample 7 for Examples 1 to 10 and Comparative Example 5. Looking at FIGS. 5 and 6, inflection points can be seen around the blending amount of component (C) of 56 and 196 ppm. When the amount of component (C) exceeds these values, the cured diameter at a depth of 1.8 mm and the cured area of the non-irradiated area tend to increase significantly, which is preferable.
- Example 6 in which the alkenyl group content of component (A) was 0.346 mmol/g was higher than that in Example 14 in which the alkenyl group content was 0.106 mmol/g (at a depth of 1.8 m). ) had a large cured diameter and excellent hardenability in the thickness direction.
- Comparative Examples 3 and 4 in which a photoinitiator was used the curability was poor in areas not exposed to light and in the thickness direction.
- Comparative Examples 2 and 4 in which the photoinitiator content was 0.17 ⁇ mol/g the compositions could not be cured.
- Comparative Example 5 uses components (A) to (C), the amount of component (C) in the composition is less than 8 ppm as platinum metal mass, hardening in the areas not exposed to light and in the thickness direction It was inferior in gender.
- Comparative Examples 6 and 7 in which the alkenyl group content of component (A) is less than 0.08 mmol/g on average and the viscosity of the composition at 23° C. exceeds 10,000 mPa ⁇ s, are The cured diameter was small and the hardenability in the thickness direction was poor.
- the cured product of the ultraviolet curable silicone composition is useful as a sealant for electrical parts, electronic parts, etc.
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Abstract
Description
[1](A)1分子中に少なくとも2個のアルケニル基を有し、アルケニル基含有量が平均して0.08mmol/g以上であるポリオルガノシロキサン;(B)1分子中に少なくとも3個の、ケイ素原子に結合した水素原子を有するポリオルガノハイドロジェンシロキサン;及び(C)紫外線により活性化する白金系触媒を含む、紫外線硬化性シリコーン組成物であって、(B)成分が、(B1)Rc1 2HSiO1/2単位(式中、Rc1は、独立して、C1-C6アルキル基又はC6-C20アリール基である)及びSiO4/2単位を含むポリオルガノハイドロジェンシロキサンを含み、前記組成物中の(C)成分の配合量が、白金金属質量として8~400ppmであり、前記組成物の23℃における粘度が10~10,000mPa・sであり、前記組成物に、イエロールーム内で、径7.0mm、照度100mW/cm2、波長365nmの紫外線を45秒間照射後、23℃で16時間保管して得られた硬化物について、深さ1.8mmにおける硬化直径が10.8mm以上である、紫外線硬化性シリコーン組成物。
[2](A)成分が直鎖状ポリオルガノシロキサンを含み、かつ、(A)成分のアルケニル基含有量が平均して0.09~1.8mmol/gである、[1]に記載の紫外線硬化性シリコーン組成物。
[3]前記組成物中の(C)成分の配合量が、白金金属質量として40~350ppmである、[1]又は[2]に記載の紫外線硬化性シリコーン組成物。
[4](B1)成分が、3~6個のSiO4/2単位及び6~12個のRc1 2HSiO1/2単位が結合しているポリオルガノハイドロジェンシロキサンである、[1]~[3]のいずれか1つに記載の紫外線硬化性シリコーン組成物。
[5](C)成分が環状ジエン化合物を配位子に有する白金系触媒である、[1]~[4]のいずれか1つに記載の紫外線硬化性シリコーン組成物。
[6](A)成分のアルケニル基のモル数ViAに対する、(B)成分のケイ素原子に結合した水素原子のモル数HBの比、HB/ViA比が0.30~3.5である、[1]~[5]のいずれか1つに記載の紫外線硬化性シリコーン組成物。
[7][1]~[6]のいずれか1つに記載の紫外線硬化性シリコーン組成物を含む、ポッティング材料。
[8]コネクタピン用である、[7]に記載のポッティング材料。
[9][1]~[6]のいずれか1つに記載の紫外線硬化性シリコーン組成物の硬化物を含む、封止材。
[10]電気部品又は電子部品用である、[9]に記載の封止材。
[11]電気部品又は電子部品がコネクタピンを有するコネクタである、[10]に記載の封止材。
M:(CH3)3SiO1/2
MH:H(CH3)2SiO1/2
MVi:CH2=CH(CH3)2SiO1/2
D:(CH3)2SiO2/2
DH:H(CH3)SiO2/2
DVi:CH2=CH(CH3)SiO2/2
T:CH3SiO3/2
Q:SiO4/2(四官能性)
シロキサン化合物は、上記の構造単位を組み合わせて構築されるものであるが、上記構造単位のメチル基がフッ素のようなハロゲン、フェニル基のような炭化水素基等、他の基に置き換わったものを少なくとも部分的に含んでいてもよい。また、例えばDH 20D20と記した場合には、DH単位が20個続いた後D単位が20個続くことを意図するものではなく、各々の単位は任意に配列していてもよいことが理解される。シロキサン化合物は、T単位又はQ単位により、3次元的に様々な構造を取ることができる。
(A)成分は、1分子中に少なくとも2個のアルケニル基を有し、アルケニル基含有量が平均して0.08mmol/g以上であるポリオルガノシロキサンである。(A)成分は、紫外線硬化性シリコーン組成物のベースポリマーとして機能する。アルケニル基は、分子主鎖の分子鎖末端に結合していても、分子鎖途中の側鎖に結合していても、両方に結合していてもよい。本明細書において、分子主鎖とは、分子中で相対的に最も長い結合鎖を表す。(A)成分の分子構造は、シロキサン結合が主骨格であるものであれば、特に制限されず、直鎖状、分岐鎖状、環状又は三次元網目状のいずれでもよく、シロキサン骨格が2価の有機基により中断されていてもよい。(A)成分は、単独でも、二種以上を併用してもよい。
(A)成分のアルケニル基含有量は、分光光度計により、CH2=CH-基の吸光度(2,150nm付近)から求めることができる。
R1 mR2 nSiO(4-m-n)/2 (1)
(式中、
R1は、脂肪族不飽和結合を有しない、非置換又は置換の1価の炭化水素基であり;
R2は、アルケニル基であり;
mは、0~2の整数であり;
nは、1~3の整数であり、但し、m+nは1~3である。)
で示されるアルケニル基含有シロキサン単位を、分子中に少なくとも2個有する。
(式中、
Ra1は、独立して、C2-C6アルケニル基であり、
Rb1は、独立して、C1-C6アルキル基又はC6-C20アリール基であり、
n1は、直鎖状ポリオルガノシロキサンのアルケニル基含有量を平均して0.08mmol/g以上とする数である)で表すことができる。
(A)成分100質量%中の、両末端がジメチルビニルシロキサン単位で閉塞され、中間単位がジメチルシロキサン単位からなるポリメチルビニルシロキサンの含有量は、30質量%以上であることが好ましく、50質量%以上であることがより好ましく、80質量%以上であることがさらに好ましい。前記含有量の上限は100質量%である。
(B)成分は、1分子中に少なくとも3個の、ケイ素原子に結合した水素原子を有するポリオルガノハイドロジェンシロキサンである。(B)成分は、架橋剤として機能し、(A)成分のアルケニル基との付加反応により、網状構造を形成する。
R3 pHqSiO(4-p-q)/2 (2)
(式中、
R3は、脂肪族不飽和結合を有しない、非置換又は置換の1価の炭化水素基であり;
pは、0~2の整数であり;
qは、1~3の整数であり、但し、p+qは1~3である。)
で示されるケイ素原子に結合した水素原子を含有するシロキサン単位を、分子中に少なくとも3個有する。R3としては、一般式(1)におけるR1と同様のものが挙げられ、好ましい態様も同様である。(B)成分において、ケイ素原子に結合した水素原子は、一分子中、3~100個であることが好ましく、より好ましくは、5~50個である。
(B1)成分は、分岐状、環状及び三次元網目構造(SiO4/2単位が密集した構造)のいずれであってもよい。Rc1は、合成の容易さ等の点から、C1-C6アルキル基が好ましく、メチルが特に好ましい。
なかでも、(B1)成分は、3~6個のSiO4/2単位及び6~12個のRc1 2HSiO1/2単位が結合しているポリオルガノハイドロジェンシロキサンであることが好ましく;[Rc1 2HSiO1/2]6[SiO4/2]3、[Rc1 2HSiO1/2]8[SiO4/2]4、[Rc1 2HSiO1/2]10[SiO4/2]5、[Rc1 2HSiO1/2]12[SiO4/2]6のように、3~6個のSiO4/2単位が環状シロキサン骨格を形成し、各SiO4/2単位に2個のRc1 2HSiO1/2単位が結合している、環状ポリオルガノハイドロジェンシロキサンであることが特に好ましい。
(C)成分は、紫外線により活性化し、(A)成分のアルケニル基と、(B)成分のヒドロシリル基(Si-H基)との間の付加反応を促進するための触媒である。触媒活性が良好な観点から、(C)成分は、環状ジエン化合物を配位子に有する白金系触媒であると好ましい。(C)成分は、単独でも、二種以上を併用してもよい。
同様に、(A)成分及び(B)成分の合計質量に対する(C)成分の配合量は、白金金属質量として8~400ppmとなる量であることが好ましく、30~350ppmであることがより好ましく、37~350ppmであることがさらに好ましく、40~350ppmであることがさらにより好ましく、70~340ppmであることが特に好ましい。
紫外線硬化性シリコーン組成物は、その目的及び効果を損なうものでない限り、その他の成分を配合することができる。その他の成分としては、難燃剤、接着性付与剤、耐熱付与剤、希釈剤、フュームドシリカ等のチクソ性付与剤、無機又は有機顔料、付加反応硬化触媒の抑制剤、ポリオルガノシロキサン以外の樹脂等を適宜配合することができる。また、紫外線硬化性シリコーン組成物は、(A)成分以外のポリオルガノシロキサン、例えば、1分子中に1個以下のアルケニル基を有するポリオルガノシロキサン;(B)成分以外のポリオルガノハイドロジェンシロキサン、例えば、1分子中に1又は2個の、ケイ素原子に結合した水素原子を有するポリオルガノハイドロジェンシロキサン;等を配合することができる。その他の成分は、それぞれ単独でも、2種以上の組合せであってもよい。
紫外線硬化性シリコーン組成物は、(A)~(C)成分、さらに必要に応じてその他の成分をプラネタリー型ミキサー等の混合機で混合することにより得ることができる。混合時には、必要に応じて50~150℃の範囲で加熱しながら混合してもよい。紫外線硬化性シリコーン組成物が粉体を含む場合、均一仕上げのために、高剪断力下で混練操作を行うことが好ましい。混練装置としては、3本ロール、コロイドミル、サンドグラインダー等があるが、中でも3本ロールによる方法が好ましい。
紫外線硬化性シリコーン組成物が第1剤及び第2剤からなる2液型の組成物である場合、第1剤及び第2剤の粘度は、好ましくは、10~20,000mPa・sであり、より好ましくは、20~10,000mPa・sであり、特に好ましくは、100~5,000mPa・sである。粘度は、JIS K 6249に準拠して、回転粘度計を用いて、No.1、2、3又は4ローター、60rpm、23℃の条件で測定した値である。紫外線硬化性シリコーン組成物は、遮光下、常温以下の温度で保存されるのが好ましい。
紫外線硬化性シリコーン組成物は、紫外線の照射により硬化させることができる。照射量は、100~10,000mJ/cm2が好ましく、より好ましくは300~6,000mJ/cm2であり、さらに好ましくは500~5,000mJ/cm2である。なお、照射量は、UVAの測定値である。ここで、UVAは、315~400nmの範囲の紫外線をいう。組成物は、紫外線の波長、例えば、250~450nmの範囲を有する紫外線を照射したときの硬化性が良好である。このような波長の紫外線を放出する光源として、例えば、ウシオ電機株式会社製の高圧水銀ランプ(UV-7000)、メタルハライドランプ(UVL-4001M3-N1)、韓国:JM tech社製のメタルハライドランプ(JM-MTL 2KW)、三菱電機株式会社製の紫外線照射灯(OSBL360)、株式会社GSユアサ製の紫外線照射機(UD-20-2)、株式会社東芝製の蛍光ランプ(FL-20BLB))、Heraeus社製のHバルブ、Hプラスバルブ、Vバルブ、Dバルブ、Qバルブ及びMバルブ、シーシーエス株式会社製のLEDランプ(HLDL-155UV)等が挙げられる。
紫外線硬化性シリコーン組成物は、光が当たらない部分及び厚さ方向における硬化性に優れる。具体的には、紫外線硬化性シリコーン組成物に、イエロールーム内で、径7.0mm、照度100mW/cm2、波長365nmの紫外線を45秒間照射後、23℃で16時間保管して得られた硬化物について、深さ1.8mmにおける硬化直径は、10.8mm以上である。硬化直径は、11.0mm以上であることが好ましく、12.0mm以上であることがより好ましく、13.0mm以上であることがさらに好ましい。
イエロールームとは、紫外線を含む500nm以下の波長の光を遮蔽した環境を指し、具体的には、蛍光灯の光から500nm以下の波長を98%以上カットした環境を意味する。イエロールームは、例えば半導体工場のクリーンルーム内で感光性物質を扱う場合に、一般に設けられる。例えば、窓のない部屋を使用し、照明として、市販のイエロー蛍光灯を用いることにより、イエロールームとすることができる。市販のイエロー蛍光灯としては、例えば、株式会社東芝製イエロー光 直管形LEDランプ等が挙げられる。
紫外線硬化性シリコーン組成物の硬化物は、接着性及び透明性に優れるため、ポッティング材料に好適に使用できる。具体的には、紫外線硬化性シリコーン組成物は、光が当たりにくい部分を有する材料、特にコネクタピン用のポッティング材料に好適に使用できる。
使用した各成分は、以下のとおりである。ここで、記号は以下を意味する。
M:(CH3)3SiO1/2
MH:H(CH3)2SiO1/2
MVi:CH2=CH(CH3)2SiO1/2
D:(CH3)2SiO2/2
DH:H(CH3)SiO2/2
DVi:CH2=CH(CH3)SiO2/2
Q:SiO4/2(四官能性)
以下に示す、両末端がMVi単位で閉塞され、中間単位がD単位からなるポリメチルビニルシロキサンを使用した。
MViDm1MVi(1):ビニル基含有量が平均して0.346mmol/g、23℃における粘度:140mPa・s
MViDm2MVi(2):ビニル基含有量が平均して0.106mmol/g、23℃における粘度:1,400mPa・s
MViDm5MVi(5):ビニル基含有量が平均して0.145mmol/g、23℃における粘度:1,200mPa・s
MViDm3MVi(3):ビニル基含有量が平均して0.047mmol/g、23℃における粘度:13,000mPa・s
MViDm4MVi(4):ビニル基含有量が平均して0.029mmol/g、23℃における粘度:78,000mPa・s
平均単位式がMH 8Q4で示される架橋性ポリメチルハイドロジェンシロキサン(SiH量:10.11mmol/g)
平均単位式がMHDH 9D11 MHで示される架橋性ポリメチルハイドロジェンシロキサン(SiH量:8.27mmol/g)
平均単位式がMDH 23D16Mで示される架橋性ポリメチルハイドロジェンシロキサン(SiH量:8.60mmol/g)
(メチルシクロペンタジエニル)トリメチル白金錯体(Strem Chemicals, Inc.社製(ドイツ)、白金量:61.1質量%)
(1)1分子中に少なくとも2個の、硫黄原子に結合した水素原子を有するポリオルガノシロキサン(SH量:0.96mmol/g)
(2)アクリル系モノマー:4-ヒドロキシブチルアクリレート(三菱ケミカル株式会社製、4HBA)
(3)光開始剤:2-ヒドロキシ-2-メチル-1-フェニルプロパノン(IGM Resins B.V.社製、Irgacure(登録商標)1173)。1.0質量%希釈液を使用。
組成物の調製をイエロールーム内で実施した。(C)成分をMViDm1MVi(1)により1.0質量%に希釈した。MViDm1MVi(1)91.30質量部に、前記(C)成分の希釈液5.50質量部((C)成分:0.055質量部、MViDm1MVi(1):5.445質量部)及び(B)成分3.20質量部を添加、混合して、実施例1の紫外線硬化性シリコーン組成物を得た。
(A)~(C)成分及びその配合量を、表1のように変更した以外は実施例1と同様にして、実施例2~14の紫外線硬化性シリコーン組成物を得た。
各成分及びその配合量を、表2のように変更した以外は実施例1と同様にして、比較例1~15の紫外線硬化性組成物を得た。
[粘度]
実施例1~14及び比較例1~15の組成物について、JIS K 6249に準拠して、回転粘度計(ビスメトロン VDA2型、芝浦システム株式会社製)を使用して、No.2ローターを使用し、60rpmで、23℃における粘度を測定した。組成物の調製直後及びイエロールーム外にて23℃で24時間保管後に、それぞれ粘度を測定した。結果を表3及び4に示す。
実施例1~14及び比較例1~15の組成物を、縦100mm×横100mm×深さ2mmの型に流し込み、シーシーエス株式会社製HLDL-155UVを用いて、照度100mW/cm2の紫外線を45秒間照射して硬化させた後、さらに23℃50RH%下で16時間保管した。こうして得た硬化物について、ASTM D 2240に準拠して、ショア00硬度を測定した。なお、紫外線照射により組成物が硬化しなかった場合は、「未硬化」とした。結果を表3及び4に示す。
実施例1~14及び比較例1~15の組成物について、粘弾性測定装置MCR301(Anton Paar社製)を使用し、紫外線の照射開始からの貯蔵弾性率G’を経時的に測定した。前記粘弾性測定装置を使用し、Φ12mmパラレルプレートを用い、ギャップ0.5mm、周波数1Hz及び歪1%にて、紫外線硬化性シリコーン組成物の23℃における貯蔵弾性率G’の測定を開始した。照度100mW/cm2の紫外線を紫外線硬化性シリコーン組成物に45秒間照射(照射量4,500mJ/cm2)し、照射開始時から貯蔵弾性率G’が損失弾性率G”と等しくなるまでの時間をゲル化時間とした。ゲル化時間が短いほど速硬化性であり、硬化性に優れていると判断した。なお、ゲル化時間の測定は、紫外線の照射開始60分後まで行い、貯蔵弾性率G’が損失弾性率G”未満の場合は、「未硬化」とした。結果を表3及び4に示す。
紫外線を照射した場合に、照射された範囲だけでなく、その範囲をどの程度まで拡張して組成物を硬化させることができるかの指標として、硬化直径を測定した。図1は、上記測定をするための装置をイエロールームにて上方から撮影した写真であり、図2は、該装置を上方から見た場合の模式図である。図3は、図2のA-A’線断面図である。図4は、図2及び3において、紫外線照射後の硬化領域及び硬化直径を説明する模式図である。
(A)成分のアルケニル基含有量が平均して0.08mmol/g未満であり、組成物の23℃における粘度が10,000mPa・sを超える比較例6及び7は、深さ1.8mmにおける硬化直径が小さく、厚さ方向の硬化性が劣っていた。(B)成分が直鎖状のポリオルガノハイドロジェンシロキサンである比較例8~15は、深さ1.8mmにおける硬化直径が小さく、厚さ方向の硬化性が劣っていた。特に、実施例6、8及び10と、比較例8~10及び比較例12~14とをそれぞれ比較することにより、(B)成分が(B1)成分である実施例の組成物は、(B)成分が直鎖状のポリオルガノハイドロジェンシロキサンである比較例の組成物に比べ、深さ1.8mmにおける硬化直径及び非照射部の硬化面積が顕著に優れることがわかる。
2 穴
3 透明なガラス
4 底部用黒色テープ
5 上部用黒色テープ
6 金属製型
7 試料(紫外線硬化性シリコーン組成物)
8 硬化領域
9 硬化直径
Claims (11)
- (A)1分子中に少なくとも2個のアルケニル基を有し、アルケニル基含有量が平均して0.08mmol/g以上であるポリオルガノシロキサン;
(B)1分子中に少なくとも3個の、ケイ素原子に結合した水素原子を有するポリオルガノハイドロジェンシロキサン;及び
(C)紫外線により活性化する白金系触媒
を含む、紫外線硬化性シリコーン組成物であって、
(B)成分が、(B1)Rc1 2HSiO1/2単位(式中、Rc1は、独立して、C1-C6アルキル基又はC6-C20アリール基である)及びSiO4/2単位を含むポリオルガノハイドロジェンシロキサンを含み、
前記組成物中の(C)成分の配合量が、白金金属質量として8~400ppmであり、
前記組成物の23℃における粘度が10~10,000mPa・sであり、
前記組成物に、イエロールーム内で、径7.0mm、照度100mW/cm2、波長365nmの紫外線を45秒間照射後、23℃で16時間保管して得られた硬化物について、深さ1.8mmにおける硬化直径が10.8mm以上である、紫外線硬化性シリコーン組成物。 - (A)成分が直鎖状ポリオルガノシロキサンを含み、かつ、(A)成分のアルケニル基含有量が平均して0.09~1.8mmol/gである、請求項1に記載の紫外線硬化性シリコーン組成物。
- 前記組成物中の(C)成分の配合量が、白金金属質量として40~350ppmである、請求項1又は2に記載の紫外線硬化性シリコーン組成物。
- (B1)成分が、3~6個のSiO4/2単位及び6~12個のRc1 2HSiO1/2単位が結合しているポリオルガノハイドロジェンシロキサンである、請求項1又は2に記載の紫外線硬化性シリコーン組成物。
- (C)成分が環状ジエン化合物を配位子に有する白金系触媒である、請求項1又は2に記載の紫外線硬化性シリコーン組成物。
- (A)成分のアルケニル基のモル数ViAに対する、(B)成分のケイ素原子に結合した水素原子のモル数HBの比、HB/ViA比が0.30~3.5である、請求項1又は2に記載の紫外線硬化性シリコーン組成物。
- 請求項1又は2に記載の紫外線硬化性シリコーン組成物を含む、ポッティング材料。
- コネクタピン用である、請求項7に記載のポッティング材料。
- 請求項1又は2に記載の紫外線硬化性シリコーン組成物の硬化物を含む、封止材。
- 電気部品又は電子部品用である、請求項9に記載の封止材。
- 電気部品又は電子部品がコネクタピンを有するコネクタである、請求項10に記載の封止材。
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| KR1020247034144A KR20240169642A (ko) | 2022-03-31 | 2023-03-22 | 자외선 경화성 실리콘 조성물 |
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| CN202380028741.8A CN118900894A (zh) | 2022-03-31 | 2023-03-22 | 紫外线固化性有机硅组合物 |
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| JP2021138865A (ja) * | 2020-03-06 | 2021-09-16 | モメンティブ・パフォーマンス・マテリアルズ・ジャパン合同会社 | 2成分付加型シリコーン組成物、画像表示装置及び密着剤パッケージ |
| WO2022102622A1 (ja) * | 2020-11-10 | 2022-05-19 | ダウ シリコーンズ コーポレーション | 紫外線硬化性オルガノポリシロキサン組成物およびその用途 |
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- 2023-03-22 CN CN202380028741.8A patent/CN118900894A/zh active Pending
- 2023-03-22 KR KR1020247034144A patent/KR20240169642A/ko active Pending
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| JP2003213132A (ja) | 2002-01-23 | 2003-07-30 | Shin Etsu Chem Co Ltd | オルガノポリシロキサンゲル組成物 |
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