Light stabilizer composition, method for producing resin composition containing same, method for improving blocking resistance of light stabilizer composition, and hindered amine compound used in these

Abstract

The present invention provides: a light stabilizer composition which has improved blocking resistance; a method for producing a resin composition which contains this light stabilizer composition; a method for improving the blocking resistance of a light stabilizer composition; and a hindered amine compound which is used in these.　A light stabilizer composition according to the present invention contains a hindered amine compound and silica; the hindered amine compound contains a compound that is represented by general formula (1); and the value of agglomeration hardness as determined by a specific measurement method is 55 N or less. (In general formula (1), R1 represents a hydrogen atom or the like; and R2 represents an alkyl group or the like.)

Description

Light stabilizer composition, method for producing resin composition containing the same, method for improving blocking resistance of light stabilizer composition, and hindered amine compound used therein

[0001] The present invention relates to a light stabilizer composition, a method for producing a resin composition containing the same, a method for improving the blocking resistance of a light stabilizer composition, and a hindered amine compound used in these methods. More specifically, the present invention relates to a light stabilizer composition with improved blocking resistance, a method for producing a resin composition containing the same, a method for improving the blocking resistance of a light stabilizer composition, and a hindered amine compound used in these methods.

[0002] Various hindered amine compounds have been used as light stabilizers to impart light stability to synthetic resins. Depending on their molecular structures, hindered amine compounds may be liquid or low-melting solids. In this case, there is room for further improvement in terms of handleability.

[0003] As one method for improving the handleability of a hindered amine compound, for example, Patent Document 1 below proposes blending silica with a hindered amine compound to form a light stabilizer composition.

[0004] International Publication No. 2015 / 079896

[0005] However, the light stabilizer composition described in Patent Document 1 has room for further improvement in terms of preventing blocking during storage.

[0006] Therefore, an object of the present invention is to provide a light stabilizer composition having improved blocking resistance, a method for producing a resin composition containing the same, a method for improving the blocking resistance of a light stabilizer composition, and a hindered amine compound to be used therein.

[0007] As a result of intensive investigations to solve the above-mentioned problems, the present inventors have found that the above-mentioned problems can be solved by appropriately selecting a hindered amine and silica in a light stabilizer composition containing a hindered amine compound and silica, and by controlling the properties of the light stabilizer composition, and have thus completed the present invention.

[0008] That is, the light stabilizer composition of the present invention comprises a hindered amine compound and silica, wherein the hindered amine compound is a compound represented by the following general formula (1): (In general formula (1), R １ represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms; R ２ represents a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, or a group represented by the following general formula (2): (In general formula (2), R ３ represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms.), and is characterized in that the value of cohesive hardness measured by the following measurement method is 55 N or less.

[0009] [Method for measuring agglomeration hardness] (1) The light stabilizer composition is filled into a cylindrical container with an inner diameter of 5.1 cm to a height of 4 cm from the bottom. (2) An aluminum disk with a diameter of 5.0 cm and a thickness of 1 mm is placed on top of the light stabilizer composition filled in the container, a load of 3 kgf is applied to the top of the disk, and the container is left to stand for 1 minute, thereby compressing the light stabilizer composition filled in the container. (3) The load and the disk are removed, and the container is additionally filled with the light stabilizer composition to a height of 4 cm from the bottom. (4) Steps (2) and (3) are repeated until the bulk of the light stabilizer composition no longer decreases during compression in step (2). (5) The disk is placed on top of the light stabilizer composition filled in the container, a load of 1 kgf is applied to the top of the disk, and the container is heated at 60°C for 6 hours. (6) After heating, the container is cooled at -15°C for 6 hours. (7) After cooling is complete, the sample is allowed to stand for 6 hours at 15° C. (8) The load and the disk are removed, and the cylindrical sample made of the light stabilizer composition is taken out of the container. The removed sample is allowed to stand for 10 minutes at 23° C. and 50% humidity, and then a compression test is performed in accordance with JIS K7181 using a flat blade having a blade length of 3 cm and a blade thickness of 5 mm as a compression jig at a test speed of 50 mm / min. The measured value of the maximum test force is defined as the cohesive hardness (N).

[0010] In the light stabilizer composition of the present invention, it is preferable that at least one of the hindered amine compounds is impregnated into the silica. Also, in the light stabilizer composition of the present invention, it is preferable that the silica is silica produced by a gel method. Also, the light stabilizer composition of the present invention has a compacted bulk density of 0.20 g / cm. ３ It is preferable that the light stabilizer composition of the present invention has a melting point of 30° C. or less. It is also preferable that the light stabilizer composition of the present invention has a melting enthalpy of 50 J / g or less.

[0011] The method for producing a resin composition of the present invention is characterized by comprising a blending step of blending the light stabilizer composition of the present invention with a synthetic resin.

[0012] Further, a method for improving the blocking resistance of a light stabilizer composition of the present invention includes blending a hindered amine compound, silica, and a compound represented by the following general formula (1): (In general formula (1), R １ represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms; R ２ represents a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, or a group represented by the following general formula (2): (In general formula (2), R ３ represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms.

[0013] [Method for measuring agglomeration hardness] (1) The light stabilizer composition is filled into a cylindrical container with an inner diameter of 5.1 cm to a height of 4 cm from the bottom. (2) An aluminum disk with a diameter of 5.0 cm and a thickness of 1 mm is placed on top of the light stabilizer composition filled in the container, a load of 3 kgf is applied to the top of the disk, and the container is left to stand for 1 minute, thereby compressing the light stabilizer composition filled in the container. (3) The load and the disk are removed, and the container is additionally filled with the light stabilizer composition to a height of 4 cm from the bottom. (4) Steps (2) and (3) are repeated until the bulk of the light stabilizer composition no longer decreases during compression in step (2). (5) The disk is placed on top of the light stabilizer composition filled in the container, a load of 1 kgf is applied to the top of the disk, and the container is heated at 60°C for 6 hours. (6) After heating, the container is cooled at -15°C for 6 hours. (7) After cooling is complete, the sample is allowed to stand for 6 hours at 15° C. (8) The load and the disk are removed, and the cylindrical sample made of the light stabilizer composition is taken out of the container. The removed sample is allowed to stand for 10 minutes at 23° C. and 50% humidity, and then a compression test is performed in accordance with JIS K7181 using a flat blade having a blade length of 3 cm and a blade thickness of 5 mm as a compression jig at a test speed of 50 mm / min. The measured value of the maximum test force is defined as the cohesive hardness (N).

[0014] The hindered amine compound of the present invention is a hindered amine compound for use in a light stabilizer composition, which contains a hindered amine compound and silica, and has a cohesive hardness value of 55 N or less as measured by the following measurement method, wherein the hindered amine compound is represented by the following general formula (1): (In general formula (1), R １ represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms; R ２ represents a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, or a group represented by the following general formula (2): (In general formula (2), R ３represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms.

[0015] [Method for measuring agglomeration hardness] (1) The light stabilizer composition is filled into a cylindrical container with an inner diameter of 5.1 cm to a height of 4 cm from the bottom. (2) An aluminum disk with a diameter of 5.0 cm and a thickness of 1 mm is placed on top of the light stabilizer composition filled in the container, a load of 3 kgf is applied to the top of the disk, and the container is left to stand for 1 minute, thereby compressing the light stabilizer composition filled in the container. (3) The load and the disk are removed, and the container is additionally filled with the light stabilizer composition to a height of 4 cm from the bottom. (4) Steps (2) and (3) are repeated until the bulk of the light stabilizer composition no longer decreases during compression in step (2). (5) The disk is placed on top of the light stabilizer composition filled in the container, a load of 1 kgf is applied to the top of the disk, and the container is heated at 60°C for 6 hours. (6) After heating, the container is cooled at -15°C for 6 hours. (7) After cooling is complete, the sample is allowed to stand for 6 hours at 15° C. (8) The load and the disk are removed, and the cylindrical sample made of the light stabilizer composition is taken out of the container. The removed sample is allowed to stand for 10 minutes at 23° C. and 50% humidity, and then a compression test is performed in accordance with JIS K7181 using a flat blade having a blade length of 3 cm and a blade thickness of 5 mm as a compression jig at a test speed of 50 mm / min. The measured value of the maximum test force is defined as the cohesive hardness (N).

[0016] Another light stabilizer composition of the present invention includes a hindered amine compound and silica produced by a gel process, wherein the hindered amine compound is represented by general formula (1): (In general formula (1), R １ represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms; R ２ represents a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, or a group represented by the following general formula (2): (In general formula (2), R ３ represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms.

[0017] In the light stabilizer composition of the present invention, it is preferable that at least one of the hindered amine compounds is impregnated into the silica. In addition, the light stabilizer composition of the present invention has a compacted bulk density of 0.20 g / cm. ３ It is preferable that the other light stabilizer composition of the present invention has a melting point of 30° C. or less. It is also preferable that the other light stabilizer composition of the present invention has a melting enthalpy of 50 J / g or less. It is also preferable that the other light stabilizer composition of the present invention has an agglomeration hardness value of 55 N or less, as measured by the following measurement method.

[0018] [Method for measuring agglomeration hardness] (1) The light stabilizer composition is filled into a cylindrical container with an inner diameter of 5.1 cm to a height of 4 cm from the bottom. (2) An aluminum disk with a diameter of 5.0 cm and a thickness of 1 mm is placed on top of the light stabilizer composition filled in the container, a load of 3 kgf is applied to the top of the disk, and the container is left to stand for 1 minute, thereby compressing the light stabilizer composition filled in the container. (3) The load and the disk are removed, and the container is additionally filled with the light stabilizer composition to a height of 4 cm from the bottom. (4) Steps (2) and (3) are repeated until the bulk of the light stabilizer composition no longer decreases during compression in step (2). (5) The disk is placed on top of the light stabilizer composition filled in the container, a load of 1 kgf is applied to the top of the disk, and the container is heated at 60°C for 6 hours. (6) After heating, the container is cooled at -15°C for 6 hours. (7) After cooling is complete, the sample is allowed to stand for 6 hours at 15° C. (8) The load and the disk are removed, and the cylindrical sample made of the light stabilizer composition is taken out of the container. The removed sample is allowed to stand for 10 minutes at 23° C. and 50% humidity, and then a compression test is performed in accordance with JIS K7181 using a flat blade having a blade length of 3 cm and a blade thickness of 5 mm as a compression jig at a test speed of 50 mm / min. The measured value of the maximum test force is defined as the cohesive hardness (N).

[0019] Another method for producing a resin composition of the present invention is characterized by comprising a blending step of blending the light stabilizer composition of the present invention with a synthetic resin.

[0020] Another method for improving the blocking resistance of the light stabilizer composition of the present invention is to use a compound represented by the following general formula (1): (In general formula (1), R １ represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms; R ２ represents a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, or a group represented by the following general formula (2): (In general formula (2), R ３represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms.), silica produced by a gel method, and

[0021] The hindered amine compound of the present invention is a hindered amine compound for use in a light stabilizer composition containing a hindered amine compound and silica produced by a gel method, wherein the hindered amine compound is represented by the following general formula (1): (In general formula (1), R １ represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms; R ２ represents a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, or a group represented by the following general formula (2): (In general formula (2), R ３ represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms.

[0022] According to the present invention, it is possible to provide a light stabilizer composition having improved blocking resistance, a method for producing a resin composition containing the same, a method for improving the blocking resistance of a light stabilizer composition, and a hindered amine compound used therein.

[0023] A first embodiment of the present invention will be described in detail below. <Light stabilizer composition> The light stabilizer composition of the first embodiment contains a hindered amine compound containing a compound represented by the following general formula (1) and silica, and has an agglomeration hardness value of 55 N or less as measured by the following measurement method:

[0024]

[0025] In general formula (1), R １represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms; R ２ represents a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, or a group represented by the following general formula (2):

[0026]

[0027] In general formula (2), R ３ represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms.

[0028] [Method for measuring agglomeration hardness] (1) The light stabilizer composition is filled into a cylindrical container with an inner diameter of 5.1 cm to a height of 4 cm from the bottom. (2) An aluminum disk with a diameter of 5.0 cm and a thickness of 1 mm is placed on top of the light stabilizer composition filled in the container, and a load of 3 kgf is applied to the top of the disk. The container is left to stand for 1 minute, thereby compressing the light stabilizer composition filled in the container. (3) The load and disk are removed, and the container is further filled with the light stabilizer composition to a height of 4 cm from the bottom. (4) Steps (2) and (3) are repeated until the bulk of the light stabilizer composition no longer decreases during compression in step (2). (5) The disk is placed on top of the light stabilizer composition filled in the container, and a load of 1 kgf is applied to the top of the disk. The container is heated at 60°C for 6 hours. (6) After heating, the container is cooled at -15°C for 6 hours. (7) After cooling, the container is left to stand at 15°C for 6 hours. (8) The load and the disk are removed, and the cylindrical sample made of the light stabilizer composition is taken out of the container. The taken-out sample is allowed to stand at 23°C and 50% humidity for 10 minutes, and then a compression test is carried out in accordance with JIS K7181 using a flat blade having a blade length of 3 cm and a blade thickness of 5 mm as a compression jig at a test speed of 50 mm / min. The measured value of the maximum test force is taken as the cohesive hardness (N).

[0029] The light stabilizer composition of this embodiment has excellent blocking resistance. That is, the blocking resistance of the light stabilizer composition can be improved by blending a hindered amine compound containing a compound represented by general formula (1) above with silica so that the value of the cohesion hardness measured by the above measurement method is 55 N or less. Furthermore, since the light stabilizer composition of this embodiment has excellent blocking resistance, it also has excellent storage stability, and further has excellent metering properties and handleability.

[0030] From the viewpoint of further improving the blocking resistance of the light stabilizer composition, the value of the cohesive hardness is preferably 40 N or less, more preferably 30 N or less, even more preferably 20 N or less, and even more preferably 15 N or less. The lower limit of the cohesive hardness is not particularly limited, and may be, for example, 1 N or more.

[0031] The value of the agglomeration hardness can be controlled by adjusting the type of hindered amine compound and the type of silica (production method, volume average particle diameter, specific surface area, etc.) contained in the light stabilizer composition, and the content ratio between the hindered amine compound and the type of silica.

[0032] The hindered amine compound contained in the light stabilizer composition of this embodiment contains a hindered amine compound and silica, and is a hindered amine compound for use in a light stabilizer composition having an agglomeration hardness value measured by the above-mentioned measurement method of 55 N or less. As described above, the hindered amine compound contained in the light stabilizer composition of this embodiment contains the compound represented by the above-mentioned general formula (1).

[0033] R １Examples of the substituted or unsubstituted alkyl group having 1 to 30 carbon atoms represented by the formula (I) include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a pentyl group, a sec-pentyl group, a tert-pentyl group, a hexyl group, a heptyl group, an octyl group, an isooctyl group, a 2-ethylhexyl group, a tert-octyl group, a nonyl group, an isononyl group, a decyl group, an undecyl group, a dodecyl group, a tridecyl group, a tetradecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, and an octadecyl group.

[0034] Examples of the substituent of the alkyl group having 1 to 30 carbon atoms include a hydroxyl group, a halogen atom such as a fluorine atom, a chlorine atom, a bromine atom or an iodine atom, a nitro group, a cyano group, and an amino group.

[0035] R １ The substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms represented by the formula (I) includes a group in which the above-mentioned substituted or unsubstituted alkyl group having 1 to 30 carbon atoms is bonded to an oxygen atom.

[0036] R ２ The substituted or unsubstituted alkyl group having 1 to 30 carbon atoms represented by R １ Examples of the substituted or unsubstituted alkyl group having 1 to 30 carbon atoms are the same as those represented by the formula (1).

[0037] R ２ The substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms represented by R １ and in which one of the carbon-carbon single bonds in the substituted or unsubstituted alkyl group having 1 to 30 carbon atoms (excluding substituted or unsubstituted methyl group) represented by the formula:

[0038] R ３ The substituted or unsubstituted alkyl group having 1 to 30 carbon atoms represented by R １ The alkyl group may be the same as the substituted or unsubstituted alkyl group having 1 to 30 carbon atoms represented by R ３ The substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms represented by R １Examples of the substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms include the same as those represented by the formula (1).

[0039] In general formula (1), R ２ is preferably a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms or a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, more preferably a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, even more preferably an unsubstituted alkyl group having 1 to 30 carbon atoms, and even more preferably an unsubstituted alkyl group having 11 to 21 carbon atoms. ２ may be a group represented by general formula (2).

[0040] In general formula (1), R ２ is a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms or a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, R １ is preferably a hydrogen atom or a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, more preferably a hydrogen atom or an unsubstituted alkyl group having 1 to 30 carbon atoms, still more preferably a hydrogen atom or a methyl group, and particularly preferably a hydrogen atom.

[0041] In addition, in the general formula (1), R ２ is a group represented by general formula (2), R １ is preferably a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, more preferably a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, even more preferably an unsubstituted alkoxy group having 1 to 30 carbon atoms, and even more preferably an unsubstituted alkoxy group having 5 to 21 carbon atoms.

[0042] In general formula (2), R ３is preferably a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, more preferably a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, even more preferably an unsubstituted alkoxy group having 1 to 30 carbon atoms, and even more preferably an unsubstituted alkoxy group having 5 to 21 carbon atoms. ３ is R １ It is preferable that the group is the same as

[0043] Specific examples of the compound represented by general formula (1) include the following compounds, etc. However, the compound represented by general formula (1) is not limited to these.

[0044]

[0045] The hindered amine compound contained in the light stabilizer composition of this embodiment may include a hindered amine compound other than the compound represented by the general formula (1) above.

[0046] The silica contained in the light stabilizer composition of this embodiment may be either a natural product or a synthetic product, and may be either crystalline or amorphous.In addition, the silica may be produced by a wet method such as a gel method or a precipitation method, or may be produced by a dry method such as a combustion method, arc discharge, or plasma discharge.From the viewpoint of further improving the blocking resistance of the light stabilizer composition, the silica is preferably produced by a wet method, more preferably by a gel method or a precipitation method, and even more preferably by a gel method.

[0047] The volume average particle size of the silica contained in the light stabilizer composition of this embodiment is not particularly limited and may be, for example, 0.1 to 100 μm. Here, the volume average particle size of the silica is a 50% cumulative particle size measured by a laser diffraction / scattering method in accordance with ISO-13320.

[0048] The specific surface area of ​​the silica contained in the light stabilizer composition of this embodiment is not particularly limited, and may be, for example, 100 to 1000 m ２The specific surface area of ​​the silica contained in the light stabilizer composition of this embodiment is 120 to 800 m ２ / g, and 150 to 600m ２ / g, and more preferably 180 to 500m ２ / g, and more preferably 200 to 300m ２ Here, the specific surface area of ​​silica is the BET specific surface area measured in accordance with JIS Z 8830.

[0049] The amount of silica contained in the light stabilizer composition of this embodiment is not particularly limited, and may be, for example, 10 to 1,000 parts by mass relative to 100 parts by mass of the hindered amine compound. The amount of silica contained in the light stabilizer composition of this embodiment is preferably 20 to 500 parts by mass, more preferably 25 to 400 parts by mass, and even more preferably 50 to 200 parts by mass relative to 100 parts by mass of the hindered amine compound.

[0050] The light stabilizer composition of the present embodiment may further contain other additives such as a phenol-based antioxidant, a phosphorus-based antioxidant, a thioether-based antioxidant, an ultraviolet absorber, a nucleating agent, a flame retardant, a flame retardant aid, a lubricant, a filler, a metal soap, a hydrotalcite, an antistatic agent, a pigment, or a dye.

[0051] The method for producing the light stabilizer composition of this embodiment is not particularly limited, and examples thereof include a method in which a hindered amine compound, silica, and, if necessary, other additives are blended and mixed using a known mixing device such as a mixer.

[0052] In the light stabilizer composition of this embodiment, at least one of the hindered amine compounds is preferably impregnated into silica, i.e., at least one of the hindered amine compounds is preferably held in the pores of silica in a liquid state or adsorbed or sorbed in the pores of silica in a fine particle solid state.

[0053] Examples of methods for impregnating silica with a hindered amine compound include a method in which a liquid or molten hindered amine compound is mixed with silica under atmospheric pressure or reduced pressure, and a method in which a solution in which a hindered amine compound is dissolved in a solvent is mixed with silica and then the solvent is removed.

[0054] From the viewpoint of achieving excellent dispersibility of the light stabilizer composition in synthetic resins, the melting point of the light stabilizer composition of this embodiment is preferably 30° C. or lower, more preferably 25° C. or lower, even more preferably 20° C. or lower, and even more preferably 15° C. or lower. The lower limit of the melting point is not particularly limited, and may be, for example, −50° C. or higher. In this embodiment, the melting point refers to the peak top temperature (° C.) of the endothermic peak that first appears during the temperature rise process in differential scanning calorimetry.

[0055] Furthermore, from the viewpoint of achieving excellent dispersibility of the light stabilizer composition in synthetic resins, the light stabilizer composition of this embodiment preferably has a fusion enthalpy of 50 J / g or less, more preferably 35 J / g or less. The lower limit of the fusion enthalpy is not particularly limited, and may be, for example, 5 J / g or more. In this embodiment, the fusion enthalpy refers to the enthalpy change (J / g) calculated based on the area of ​​the endothermic peak that first appears during the temperature rise process in differential scanning calorimetry.

[0056] Furthermore, from the viewpoint of making the light stabilizer composition easy to handle, the light stabilizer composition of this embodiment has a compacted bulk density of 0.20 g / cm ３ It is preferable that the density is 0.25 g / cm or more. ３ More preferably, it is 0.30 g / cm or more. ３ More preferably, it is 0.35 g / cm or more. ３ It is even more preferable that the value is 0.40 g / cm or more. ３ In the present embodiment, the packed bulk density is the bulk density (g / cm 3 ) measured by a method in accordance with JIS K 5101-12-2. ３ ) refers to

[0057] The light stabilizer composition of this embodiment can impart excellent light stability to synthetic resins such as polyolefin resins, polyester resins, polycarbonate resins, polyamide resins, polyurethane resins, acrylic resins, halogen-containing resins, epoxy resins, phenolic resins, urea resins, melamine resins, silicone resins, natural rubber, and synthetic rubber, and can be used as a component of resin compositions for molded products such as automobile parts, construction materials, agricultural materials, packaging materials, daily goods, and toys, as well as resin compositions for paints and resin compositions for sealants.

[0058] <Method for Producing Resin Composition> The method for producing a resin composition according to the present embodiment includes a blending step of blending the above-described light stabilizer composition into a synthetic resin.

[0059] According to the method for producing a resin composition of the present embodiment, a light stabilizer composition that has excellent blocking resistance and is easy to measure and handle is used as the light stabilizer to be blended into a synthetic resin, so that a resin composition with excellent weather resistance can be produced efficiently with uniform quality.

[0060] Examples of synthetic resins include polyolefin resins, polyester resins, polycarbonate resins, polyamide resins, polyurethane resins, acrylic resins, halogen-containing resins, epoxy resins, phenolic resins, urea resins, melamine resins, silicone resins, natural rubber, and synthetic rubber.

[0061] In the method for producing a resin composition according to this embodiment, the blending amount of the light stabilizer composition may be, for example, 0.001 to 10 parts by mass relative to 100 parts by mass of the synthetic resin. From the viewpoint of sufficiently suppressing bleeding or blooming of the components contained in the light stabilizer composition while providing excellent weather resistance to the resin composition, the blending amount of the light stabilizer composition is preferably 0.01 to 5 parts by mass, more preferably 0.05 to 3 parts by mass, and even more preferably 0.01 to 1 part by mass relative to 100 parts by mass of the synthetic resin.

[0062] The synthetic resin may further contain other additives such as a phenolic antioxidant, a phosphorus-based antioxidant, a thioether-based antioxidant, an ultraviolet absorber, a nucleating agent, a flame retardant, a flame retardant aid, a lubricant, a filler, a metal soap, hydrotalcites, an antistatic agent, a pigment, or a dye.

[0063] The method for blending the light stabilizer composition with the synthetic resin is not particularly limited, and examples thereof include a method in which the synthetic resin, the light stabilizer composition, and, if necessary, other additives are pre-mixed using various mixers such as a tumbler or an FM mixer, and then melt-kneaded using a Banbury mixer, a roll, a Brabender mixer, a single-screw kneading extruder, a twin-screw kneading extruder, a kneader, or the like.

[0064] The resin composition produced by the method for producing a resin composition of this embodiment can be used to form molded articles such as injection molded articles, fibers, biaxially oriented films, uniaxially oriented films, unstretched films, sheets, thermoformed articles, extrusion blow molded articles, injection blow molded articles, injection stretch blow molded articles, profile extrusion molded articles, and rotational molded articles, and more specifically, vehicle components, household goods, food packaging materials, etc. Furthermore, the resin composition produced by the method for producing a resin composition of this embodiment can be applied as a paint to a substrate made of, for example, metal or resin, and cured to form a coating film. The molded articles and coating films thus formed have excellent weather resistance.

[0065] <Method for Improving Blocking Resistance of Light Stabilizer Composition> The method for improving the blocking resistance of the light stabilizer composition of this embodiment involves blending a hindered amine compound containing a compound represented by general formula (1) and silica so that the value of aggregation hardness measured by the following measurement method is 55 N or less.

[0066]

[0067] Here, in general formula (1), R １ represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms; R ２represents a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, or a group represented by the following general formula (2):

[0068]

[0069] Here, in general formula (2), R ３ represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms.

[0070] [Method for measuring agglomeration hardness] (1) The light stabilizer composition is filled into a cylindrical container with an inner diameter of 5.1 cm to a height of 4 cm from the bottom. (2) An aluminum disk with a diameter of 5.0 cm and a thickness of 1 mm is placed on top of the light stabilizer composition filled in the container, and a load of 3 kgf is applied to the top of the disk. The container is left to stand for 1 minute, thereby compressing the light stabilizer composition filled in the container. (3) The load and disk are removed, and the container is further filled with the light stabilizer composition to a height of 4 cm from the bottom. (4) Steps (2) and (3) are repeated until the bulk of the light stabilizer composition no longer decreases during compression in step (2). (5) The disk is placed on top of the light stabilizer composition filled in the container, and a load of 1 kgf is applied to the top of the disk. The container is heated at 60°C for 6 hours. (6) After heating, the container is cooled at -15°C for 6 hours. (7) After cooling, the container is left to stand at 15°C for 6 hours. (8) The load and the disk are removed, and the cylindrical sample made of the light stabilizer composition is taken out of the container. The taken-out sample is allowed to stand at 23°C and 50% humidity for 10 minutes, and then a compression test is carried out in accordance with JIS K7181 using a flat blade having a blade length of 3 cm and a blade thickness of 5 mm as a compression jig at a test speed of 50 mm / min. The measured value of the maximum test force is taken as the cohesive hardness (N).

[0071] According to the method of the present embodiment, the blocking resistance of the light stabilizer composition can be improved, and the resulting light stabilizer composition has excellent storage stability, and further has excellent metering properties and handling properties.

[0072] In the method for improving the blocking resistance of a light stabilizer composition of this embodiment, the hindered amine compound and silica may be the same as those contained in the light stabilizer composition described above. The amount of silica to be added may be, for example, 10 to 1,000 parts by mass, preferably 20 to 500 parts by mass, more preferably 25 to 400 parts by mass, and even more preferably 50 to 200 parts by mass, per 100 parts by mass of the hindered amine compound.

[0073] In the method for improving the blocking resistance of a light stabilizer composition according to the present embodiment, it is preferable to impregnate silica with at least one of the hindered amine compounds.

[0074] In the method for improving the blocking resistance of a light stabilizer composition of this embodiment, the method for blending the hindered amine compound and silica is not particularly limited, and examples thereof include a method in which the hindered amine compound, silica, and other additives as necessary are blended and mixed using a known mixing device such as a mixer. Examples of the other additives include the same additives as those exemplified above as additives that may be contained in the light stabilizer composition.

[0075] A second embodiment of the present invention will be described below. <Light stabilizer composition> The light stabilizer composition of the second embodiment contains a hindered amine compound containing the compound represented by the general formula (1) described above, and silica produced by a gel method.

[0076] The light stabilizer composition of this embodiment has excellent blocking resistance. That is, by blending a hindered amine compound containing a compound represented by general formula (1) with silica produced by a gel method, the blocking resistance of the light stabilizer composition can be improved. Furthermore, since the light stabilizer composition of this embodiment has excellent blocking resistance, it also has excellent storage stability, and further has excellent metering properties and handleability.

[0077] In the light stabilizer composition of this embodiment, the types of hindered amine compound and silica produced by a gel method, the amount of silica produced by a gel method contained in the light stabilizer composition, other additives that may be further contained in the light stabilizer composition, the method for producing the light stabilizer composition, the melting point, enthalpy of fusion, and packed bulk density of the light stabilizer may be the same as those exemplified for the light stabilizer composition of the first embodiment.

[0078] The hindered amine compound contained in the light stabilizer composition of this embodiment is a hindered amine compound for use in a light stabilizer composition containing a hindered amine compound and silica produced by a gel method. As described above, the hindered amine compound contained in the light stabilizer composition of this embodiment includes a compound represented by general formula (1).

[0079] In the light stabilizer composition of this embodiment, at least one of the hindered amine compounds is preferably impregnated into silica.

[0080] From the viewpoint of further improving the blocking resistance of the light stabilizer composition, the value of the cohesive hardness in the light stabilizer composition of this embodiment may be, for example, 55 N or less. The value of the cohesive hardness is preferably 40 N or less, more preferably 30 N or less, even more preferably 20 N or less, and even more preferably 15 N or less. The lower limit of the cohesive hardness is not particularly limited, and may be, for example, 1 N or more. Here, the cohesive hardness is the same as that described in the first embodiment.

[0081] The light stabilizer composition of this embodiment, like the light stabilizer composition of the first embodiment, can impart excellent light stability to a synthetic resin, and can be used as a component of a resin composition for molded products, a resin composition for paints, or a resin composition for sealants.

[0082] <Method for Producing Resin Composition> The method for producing a resin composition according to the second embodiment includes a blending step of blending the above-described light stabilizer composition into a synthetic resin.

[0083] According to the method for producing a resin composition of the present embodiment, a light stabilizer composition that has excellent blocking resistance and is easy to measure and handle is used as the light stabilizer to be blended into a synthetic resin, so that a resin composition with excellent weather resistance can be produced efficiently with uniform quality.

[0084] Examples of synthetic resins used in the method for producing a resin composition of this embodiment include the same as those used in the method for producing a resin composition of the first embodiment. The amount of the light stabilizer composition blended relative to the synthetic resin may be the same as the amount of the light stabilizer composition blended in the method for producing a resin composition of the first embodiment. In addition, other additives exemplified as those that may be blended in the method for producing a resin composition of the first embodiment may also be blended into the synthetic resin. Furthermore, examples of methods for blending the light stabilizer composition into the synthetic resin include the same blending methods as in the method for producing a resin composition of the first embodiment. The resin composition produced by the method for producing a resin composition of this embodiment can be used to form a molded article or a coating film, similar to the resin composition produced by the method for producing a resin composition of the first embodiment.

[0085] <Method for Improving Blocking Resistance of Light Stabilizer Composition> The method for improving blocking resistance of a light stabilizer composition according to the second embodiment involves blending a hindered amine compound containing the compound represented by the general formula (1) described above with silica produced by a gel method.

[0086] According to the method of the present embodiment, the blocking resistance of the light stabilizer composition can be improved, and the resulting light stabilizer composition has excellent storage stability, and further has excellent metering properties and handling properties.

[0087] In the method for improving the blocking resistance of a light stabilizer composition according to this embodiment, it is preferable to impregnate silica produced by a gel method with at least one of the hindered amine compounds.

[0088] In the method for improving the blocking resistance of a light stabilizer composition of this embodiment, the types of hindered amine compound and silica produced by a gel method, the amounts of silica produced by a gel method contained in the light stabilizer composition, and the method for blending the hindered amine compound and the silica produced by a gel method may be the same as those exemplified in the method for improving the blocking resistance of a light stabilizer composition of the first embodiment.

[0089] The present invention will be explained in more detail below by way of examples, but the present invention is not limited to the following examples in any way.

[0090] <Preparation of Light Stabilizer Compositions> (Examples 1 to 6 and Comparative Example 1) 100 parts by mass of ADK STAB LA-40 (a mixture of 2,2,6,6-tetramethyl-4-piperidinyl stearate and 2,2,6,6-tetramethyl-4-piperidinyl palmitate) was heated to 50°C to melt, and then charged into an FM mixer (manufactured by Nippon Coke Corporation, device name FM-20) together with 100 parts by mass of silica shown in Table 1 below, and mixed at 50°C for 20 minutes to impregnate the silica with ADK STAB LA-40, thereby obtaining the light stabilizer compositions of Examples 1 to 6 and Comparative Example 1. The silica used in these examples is as follows:

[0091] Silica-1: Evonik, trade name Carplex BS-308N (silica produced by a gel process) Silica-2: Evonik, trade name Carplex BS-304F (silica produced by a gel process) Silica-3: Maruo Calcium, trade name Finesil X-12 (silica produced by a gel process) Silica-4: Tosoh Silica, trade name Nipgel AZ-200 (silica produced by a gel process) Silica-5: Evonik, trade name Sipernat 50 (silica produced by a precipitation process) Silica-6: Evonik, trade name Sipernat 50S (silica produced by a precipitation process) Silica-7: Evonik, trade name Carplex #80 (silica produced by a precipitation process)

[0092] <Characteristic Evaluation> (Agglomeration Hardness) First, a cylinder made of polyvinyl chloride resin and having an inner diameter of 5.1 cm was prepared. This cylinder was cut in half parallel to the axial direction to form a pair of semi-cylinders having the same shape. The pair of semi-cylinders were then combined again into a cylinder and the outer periphery was secured with adhesive tape to form a cylinder. The inside of this cylinder was then covered with polytetrafluoroethylene (PTFE) tape having a thickness of 0.2 mm. Next, this cylinder was fixed on an aluminum sheet having a thickness of 1 mm to form a cylindrical container having an inner diameter of 5.1 cm. The light stabilizer compositions of Examples 1 to 6 and Comparative Example 1 were gradually filled into this container to a height of 4 cm from the bottom.

[0093] Next, an aluminum disk having a diameter of 5.0 cm and a thickness of 1 mm was placed on top of the light stabilizer composition filled in the container, and a load of 3 kgf was applied to the top of the disk. The disk was placed so that the center of the circle on the disk intersected with the central axis of the cylinder in the container.

[0094] Subsequently, the load and the disk were removed, and the container was further filled with the light stabilizer composition to a height of 4 cm from the bottom.

[0095] The above compression and additional filling were repeated until the bulk of the light stabilizer composition no longer decreased during compression, thereby filling the container with the light stabilizer composition.

[0096] The above-mentioned disk was placed on top of the light stabilizer composition thus filled in the container, and a load of 1 kgf was applied to the top of the disk, followed by heating at 60° C. for 6 hours.

[0097] After heating, the mixture was immediately cooled to −15° C. for 6 hours, and then allowed to stand at 15° C. for 6 hours.

[0098] After leaving the sample to stand, the load and the disk were removed, the adhesive tape on the outer periphery of the cylinder was removed, the cylinder was disassembled, and the cylindrical sample consisting of the light stabilizer composition was taken out of the container. The taken-out sample was left to stand at 23°C and 50% humidity for 10 minutes, and then a compression test was carried out in accordance with JIS K7181 using a flat blade having a blade length of 3 cm and a blade thickness of 5 mm at a test speed of 50 mm / min. The measured value of the maximum test force was taken as the cohesive hardness (N). The results are also shown in Table 1.

[0099] (Melting Point and Melting Enthalpy) 10 mg of the light stabilizer compositions of Examples 1 to 6 and Comparative Example 1 were weighed into an aluminum sample pan, and the sample pan was placed in a differential scanning calorimeter (manufactured by PerkinElmer, device name: Diamond). Calorimetric analysis was performed to measure the melting point and melting enthalpy. Specifically, the sample was heated from 25°C to 50°C at a rate of 10°C / min, held at 50°C for 10 minutes, then cooled to -10°C at a rate of 10°C / min, and held at -10°C for 10 minutes. The sample was then heated to 50°C at a rate of 10°C / min. During the second heating process, the peak-top temperature of the first endothermic peak was taken as the melting point (°C) of the light stabilizer composition. The melting enthalpy (J / g) of the light stabilizer composition was calculated from the area of ​​the first endothermic peak. The results are also shown in Table 1.

[0100] (Packed bulk density) The packed bulk density (g / cm 3 ) of the light stabilizer compositions of Examples 1 to 6 and Comparative Example 1 was measured in accordance with JIS K 5101-12-2. ３ The results are shown in Table 1.

[0101] (Blocking Resistance) A storage stability test was carried out under the following conditions for the light stabilizer compositions of Examples 1 to 6 and Comparative Example 1, and the state of the light stabilizer compositions after the test was observed to evaluate the blocking resistance. The storage stability test conditions were as follows.

[0102] First, 10 kg of the light stabilizer compositions of Examples 1 to 6 and Comparative Example 1 were filled into a 45 L polyethylene bag, and the opening of the bag was sealed with a rubber band. Next, this bag was placed in a rectangular cardboard box measuring 35 cm wide, 29 cm deep, and 43 cm high, and the cardboard box was sealed with adhesive tape. Next, this cardboard box was left standing in a constant temperature chamber at 50°C for 24 hours, and then in a constant temperature chamber at 5°C for 30 days. Finally, this cardboard box was left standing in a constant temperature and humidity chamber at 25°C and 50% RH for 1 day, completing the storage stability test. After completing the storage stability test, the cardboard box and the polyethylene bag were opened in the constant temperature and humidity chamber at 25°C and 50% RH, and the light stabilizer composition was removed.

[0103] The evaluation levels for the blocking resistance of the light stabilizer compositions were as follows: Level 1: No clumped aggregates Level 2: More non-aggregated portions than clumped aggregates Level 3: Fewer non-aggregated portions than clumped aggregates Level 4: Entirely aggregated in clumps For the light stabilizer compositions of Examples 1 to 6 and Comparative Example 1, the numerical values ​​of the evaluation levels are also shown in Table 1 as an index of blocking resistance.

[0104]

[0105] The results shown in Table 1 reveal that the light stabilizer compositions of Examples 1 to 6 are superior in blocking resistance to the light stabilizer composition of Comparative Example 1.

[0106] From the above, it was confirmed that the light stabilizer composition of the present invention has excellent blocking resistance.

Claims

1. Hindered amine compounds and, Silica and, Includes, The aforementioned hindered amine compound is defined by the following general formula (1): (In general formula (1), R １ R represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms. ２ (This represents a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, or a group represented by the following general formula (2).) (In general formula (2), R ３ The compound includes a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms. A light stabilizer composition characterized in that the aggregated hardness value measured by the following measurement method is 55 N or less. [Method for measuring cohesive hardness] (1) Fill a cylindrical container with an inner diameter of 5.1 cm with the light stabilizer composition until it reaches a height of 4 cm from the bottom. (2) A 5.0 cm diameter, 1 mm thick aluminum disc is placed on top of the light stabilizer composition filled in the container, a load of 3 kgf is applied to the top of the disc, and the light stabilizer composition filled in the container is compressed by leaving it undisturbed for 1 minute. (3) Remove the load and the disc, and fill the container with the light stabilizer composition until it reaches a height of 4 cm from the bottom. (4) Repeat steps (2) and (3) above until the volume of the light stabilizer composition no longer decreases during compression in step (2). (5) The disc is placed on top of the light stabilizer composition filled in the container, a load of 1 kgf is applied to the top of the disc, and the container is heated at 60°C for 6 hours. (6) After heating is complete, cool at -15°C for 6 hours. (7) After cooling is complete, leave it to stand at 15°C for 6 hours. (8) Remove the load and the disc, take out the sample consisting of the light stabilizer composition formed into a cylindrical shape from the container, and leave the removed sample standing at 23°C and 50% humidity for 10 minutes. Then, using a flat blade with a blade length of 3 cm and a blade thickness of 5 mm as a compression jig, perform a compression test at a test speed of 50 mm / min in accordance with JIS K7181, and the measured value of the maximum test force shall be defined as the cohesive hardness (N).

2. The light stabilizer composition according to claim 1, wherein at least one of the hindered amine compounds is impregnated into the silica.

3. The light stabilizer composition according to claim 1, wherein the silica is silica produced by the gel method.

4. It has a firm bulk density of 0.20 g / cm³. ３ The light stabilizer composition according to claim 1, as described above.

5. The light stabilizer composition according to claim 1, wherein the melting point is 30°C or lower.

6. The light stabilizer composition according to claim 1, wherein the enthalpy of fusion is 50 J / g or less.

7. A method for producing a resin composition, characterized by including a compounding step of blending a synthetic resin with the light stabilizer composition described in claim 1.

8. The aggregated hardness value measured by the following measurement method should be 55 N or less. Hindered amine compounds and, Silica and, It contains, The aforementioned hindered amine compound is defined by the following general formula (1): (In general formula (1), R １ R represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms. ２ (This represents a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, or a group represented by the following general formula (2).) (In general formula (2), R ３ A method for improving the blocking resistance of a light stabilizer composition, characterized by containing a compound represented by (where represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms). [Method for measuring cohesive hardness] (1) Fill a cylindrical container with an inner diameter of 5.1 cm with the light stabilizer composition until it reaches a height of 4 cm from the bottom. (2) A 5.0 cm diameter, 1 mm thick aluminum disc is placed on top of the light stabilizer composition filled in the container, a load of 3 kgf is applied to the top of the disc, and the light stabilizer composition filled in the container is compressed by leaving it undisturbed for 1 minute. (3) Remove the load and the disc, and fill the container with the light stabilizer composition until it reaches a height of 4 cm from the bottom. (4) Repeat steps (2) and (3) above until the volume of the light stabilizer composition no longer decreases during compression in step (2). (5) The disc is placed on top of the light stabilizer composition filled in the container, a load of 1 kgf is applied to the top of the disc, and the container is heated at 60°C for 6 hours. (6) After heating is complete, cool at -15°C for 6 hours. (7) After cooling is complete, leave it to stand at 15°C for 6 hours. (8) Remove the load and the disc, take out the sample consisting of the light stabilizer composition formed into a cylindrical shape from the container, and leave the removed sample standing at 23°C and 50% humidity for 10 minutes. Then, using a flat blade with a blade length of 3 cm and a blade thickness of 5 mm as a compression jig, perform a compression test at a test speed of 50 mm / min in accordance with JIS K7181, and the measured value of the maximum test force shall be defined as the cohesive hardness (N).

9. A hindered amine compound for use in a light stabilizer composition comprising a hindered amine compound and silica, wherein the aggregated hardness value measured by the following measurement method is 55 N or less, The aforementioned hindered amine compound is defined by the following general formula (1): (In the general formula (1), R １ represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, and R ２ represents a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, or a group represented by the following general formula (2).) (In general formula (2), R ３ A hindered amine compound characterized by containing a compound represented by (where represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms). [Method for measuring cohesive hardness] (1) Fill a cylindrical container with an inner diameter of 5.1 cm with the light stabilizer composition until it reaches a height of 4 cm from the bottom. (2) A 5.0 cm diameter, 1 mm thick aluminum disc is placed on top of the light stabilizer composition filled in the container, a load of 3 kgf is applied to the top of the disc, and the light stabilizer composition filled in the container is compressed by leaving it undisturbed for 1 minute. (3) Remove the load and the disc, and fill the container with the light stabilizer composition until it reaches a height of 4 cm from the bottom. (4) Repeat steps (2) and (3) above until the volume of the light stabilizer composition no longer decreases during compression in step (2). (5) The disc is placed on top of the light stabilizer composition filled in the container, a load of 1 kgf is applied to the top of the disc, and the container is heated at 60°C for 6 hours. (6) After heating is complete, cool at -15°C for 6 hours. (7) After cooling is complete, leave it to stand at 15°C for 6 hours. (8) Remove the load and the disc, take out the sample consisting of the light stabilizer composition formed into a cylindrical shape from the container, and leave the removed sample standing at 23°C and 50% humidity for 10 minutes. Then, using a flat blade with a blade length of 3 cm and a blade thickness of 5 mm as a compression jig, perform a compression test at a test speed of 50 mm / min in accordance with JIS K7181, and the measured value of the maximum test force shall be defined as the cohesive hardness (N).

10. Hindered amine compounds and, Silica produced by the gel method, Includes, The aforementioned hindered amine compound is of general formula (1), (In general formula (1), R １ R represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms. ２ (This represents a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, or a group represented by the following general formula (2).) (In general formula (2), R ３ A light stabilizer composition characterized by containing a compound represented by (where represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms).

11. The light stabilizer composition according to claim 10, wherein at least one of the hindered amine compounds is impregnated in the silica.

12. It has a firm bulk density of 0.20 g / cm³. ３ The light stabilizer composition according to claim 10, as described above.

13. The light stabilizer composition according to claim 10, wherein the melting point is 30°C or lower.

14. The light stabilizer composition according to claim 10, wherein the enthalpy of fusion is 50 J / g or less.

15. The light stabilizer composition according to claim 10, wherein the aggregated hardness value measured by the measurement method described below is 55 N or less. [Method for measuring cohesive hardness] (1) Fill a cylindrical container with an inner diameter of 5.1 cm with the light stabilizer composition until it reaches a height of 4 cm from the bottom. (2) A 5.0 cm diameter, 1 mm thick aluminum disc is placed on top of the light stabilizer composition filled in the container, a load of 3 kgf is applied to the top of the disc, and the light stabilizer composition filled in the container is compressed by leaving it undisturbed for 1 minute. (3) Remove the load and the disc, and fill the container with the light stabilizer composition until it reaches a height of 4 cm from the bottom. (4) Repeat steps (2) and (3) above until the volume of the light stabilizer composition no longer decreases during compression in step (2). (5) The disc is placed on top of the light stabilizer composition filled in the container, a load of 1 kgf is applied to the top of the disc, and the container is heated at 60°C for 6 hours. (6) After heating is complete, cool at -15°C for 6 hours. (7) After cooling is complete, leave it to stand at 15°C for 6 hours. (8) Remove the load and the disc, take out the sample consisting of the light stabilizer composition formed into a cylindrical shape from the container, and leave the removed sample standing at 23°C and 50% humidity for 10 minutes. Then, using a flat blade with a blade length of 3 cm and a blade thickness of 5 mm as a compression jig, perform a compression test at a test speed of 50 mm / min in accordance with JIS K7181, and the measured value of the maximum test force shall be defined as the cohesive hardness (N).

16. A method for producing a resin composition, characterized by including a compounding step of blending a synthetic resin with the light stabilizer composition described in claim 10.

17. The following general formula (1), (In general formula (1), R １ R represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms. ２ (This represents a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, or a group represented by the following general formula (2).) (In general formula (2), R ３ Hindered amine compounds containing a compound represented by (where represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms), Silica produced by the gel method, A method for improving the blocking resistance of a light stabilizer composition, characterized by incorporating [a certain compound].

18. A hindered amine compound for use in a light stabilizer composition comprising a hindered amine compound and silica produced by a gel method, The aforementioned hindered amine compound is defined by the following general formula (1): (In general formula (1), R １ R represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms. ２ (This represents a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, or a group represented by the following general formula (2).) (In general formula (2), R ３ A hindered amine compound characterized by containing a compound represented by (where represents a hydrogen atom, a hydroxyl group, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms).

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