Molding material, method for producing molding material, molded body, and lighting fixture for vehicle

Abstract

The present invention provides: a molding material which has excellent impact resistance and excellent heat resistance while containing a resin waste material; a molded body; a lighting fixture for a vehicle; and a method for producing a molding material. A molding material according to the present disclosure comprises: a ground resin waste material which includes a lamp cover that contains a first methacrylic copolymer (A) having a glass transition temperature of 100-121°C and a lamp housing that contains a first styrene resin (B) which is composed of one or more resins selected from the group consisting of an ABS resin, an AES resin, and an ASA resin and has a notched Charpy impact value of less than 20 kJ / m2; and a second methacrylic copolymer (C) having a glass transition temperature of 122-150°C. This molding material has a notched Charpy impact value of 10 kJ / m2 or more and a Vicat softening temperature of 110°C or more, and contains 5-40 mass% of the first methacrylic copolymer (A), 10-55 mass% of the first styrene resin (B), and 5-50 mass% of the second methacrylic copolymer (C).

Description

Molding material, molding material manufacturing method, molded body, and vehicle lamp

[0001] The present disclosure relates to a molding material, a method for manufacturing a molding material, a molded article, and a vehicle lamp.

[0002] In recent years, the reuse and recycling of waste materials has been actively promoted in order to reduce carbon dioxide emissions. With regard to vehicle lighting fixtures, recycling of parts such as lamp covers and lamp housings made of thermoplastic resins is being considered.

[0003] For example, Patent Document 1 reports that a recycled resin material obtained by blending crushed material from molded articles of polycarbonate resin used in vehicle lighting fixtures with one copolymer resin selected from the group consisting of a copolymer resin of methyl methacrylate, butyl acrylate, and dimethylsiloxane, a copolymer resin of acrylonitrile, styrene, alkyl acrylate, and dimethylsiloxane, and a copolymer resin of alkyl methacrylate, butadiene, and styrene has excellent crack resistance to organic chemicals.

[0004] In the manufacture of vehicle lighting fixtures, the lamp cover and lamp housing are commonly bonded by heat welding from the viewpoint of manufacturing efficiency. When considering recycling lamp covers and lamp housings joined by heat welding after use, it is difficult to disassemble and separate the lamp cover and lamp housing.

[0005] Studies have been conducted on the design of vehicle lamps that are easy to dismantle and separate. For example, Patent Document 2 reports that a lamp comprising a housing attached to a vehicle body and a lens joined to the housing, the lens having a heat-generating region capable of generating heat, can be easily separated by softening or melting the heat-generating region when irradiated with electromagnetic waves. However, this method limits the lamp design and cannot be applied to the recycling of lamps from used vehicles already on the market.

[0006] It is also possible to use a resin sorting device to separately recover the lamp cover material and the lamp housing material from the mixed crushed material obtained by crushing the thermally welded lamp cover and lamp housing. However, this method requires the use of a special sorting device, and it can only be implemented in limited locations.

[0007] It is also possible to recycle the mixed crushed material as it is without separating it. For example, a recycled resin composition can be obtained by crushing a thermally welded lamp cover made of PMMA and a lamp housing made of a styrene-based resin such as ABS or ASA. The resulting mixed crushed material contains PMMA, ABS, and / or ASA. However, according to the inventors' investigations, the impact resistance and heat resistance of the recycled resin composition are reduced due to degradation and dilution caused by heat or ultraviolet light, making it difficult to recycle the recycled resin composition for applications requiring physical properties equivalent to those of virgin materials, such as lamp housings.

[0008] JP 2007-254603 A JP 2023-135410 A

[0009] An object of the present disclosure is to provide a molding material, a molded body, a vehicle lamp, and a method for manufacturing the molding material, which contain waste resin materials but have excellent impact resistance and heat resistance.

[0010] As a result of extensive research into achieving the above object, the present inventors have completed the present disclosure, which includes the following aspects.

[0011] That is, the present disclosure relates to the following [1] to

[15] : [1] A lamp cover including a first methacrylic copolymer (A) having a glass transition temperature of 100 to 121°C measured by a method in accordance with JIS K7121, and one or more resins selected from the group consisting of ABS resin, AES resin, and ASA resin having a notched Charpy impact value of 20 kJ / m or more measured by a method in accordance with JIS K7111-1 / 1eA. ２and a second methacrylic copolymer (C) having a glass transition temperature of 122 to 150°C, and a notched Charpy impact value of 10 kJ / m. ２ A molding material having a Vicat softening temperature of 110°C or higher, measured according to the method described in JIS K7206 B50, comprising 5 to 40% by mass of a first methacrylic copolymer (A), 10 to 55% by mass of a first styrene-based resin (B), and 5 to 50% by mass of a second methacrylic copolymer (C). [2] The molding material according to [1], wherein the second methacrylic copolymer (C) is a methacrylic copolymer (C1) comprising 10 to 99% by mass of methyl methacrylate units, 1 to 40% by mass of α-methylstyrene units, and 0 to 60% by mass of one or more other units (UO). [3] The molding material according to [2], wherein the methacrylic copolymer (C1) contains, as the other units (UO), aromatic vinyl compound units other than α-methylstyrene units. [4] The molding material according to [2], wherein the methacrylic copolymer (C1) contains, as the other units (UO), one or more ring structural units (UR) selected from the group consisting of an acid anhydride unit, an imide unit having a ring structure, and a lactone ring unit. [5] The molding material according to [2], wherein the one or more resins selected from the group consisting of ABS resin, AES resin, and ASA resin have a notched Charpy impact value of 20 kJ / m or more, as measured by a method in accordance with JIS K7111-1 / 1eA. ２ [6] The molding material according to any one of [1] to [4], further comprising a lamp cover containing a first methacrylic copolymer (A) having a glass transition temperature of 100 to 121°C as measured by a method in accordance with JIS K7121, and one or more resins selected from the group consisting of ABS resins, AES resins, and ASA resins having a notched Charpy impact value of 20 kJ / m or more. ２[7] A method for producing a molding material, comprising blending a second methacrylic copolymer (C) having a glass transition temperature of 122 to 150°C with pulverized resin waste obtained by pulverizing waste resin material containing a lamp housing and a first styrene-based resin (B) having a viscosity of less than 100°C. [8] A method for producing a molding material according to [6] or [7], wherein 5 to 40 mass% of the first methacrylic copolymer (A), 10 to 55 mass% of the first styrene-based resin (B), and 5 to 50 mass% of the second methacrylic copolymer (C) are blended. [9] A method for producing a molding material according to [6] or [7], wherein the second methacrylic copolymer (C) is a methacrylic copolymer (C1) comprising 10 to 99 mass% of methyl methacrylate units, 1 to 40 mass% of α-methylstyrene units, and 0 to 60 mass% of one or more other units (UO), wherein the other units (UO) include aromatic vinyl compound units other than α-methylstyrene units. [9] The method for producing a molding material according to [6] or [7], wherein the second methacrylic copolymer (C) is a methacrylic copolymer (C1) comprising 10 to 99% by mass of methyl methacrylate units, 1 to 40% by mass of α-methylstyrene units, and 0 to 60% by mass of one or more other units (UO), and the other units (UO) include one or more ring structural units (UR) selected from the group consisting of acid anhydride units, imide units having a ring structure, and lactone ring units.

[10] The molding material according to [6] or [7], further comprising one or more resins selected from the group consisting of ABS resins, AES resins, and ASA resins, each of which has a notched Charpy impact value of 20 kJ / m as measured by a method in accordance with JIS K7111-1 / 1eA. ２A method for producing the molding material according to any one of [6] to [9], characterized by blending a second styrene-based resin (D) as described above.

[11] A molded body made from the molding material according to any one of [1] to [5].

[12] A vehicle lamp comprising a lamp housing made from the molded body according to

[11] and a lamp cover.

[13] A method for producing a molding material, characterized by blending a second methacrylic copolymer (C) with pulverized material obtained by pulverizing the molded body according to

[11] .

[14] A method for producing a molding material, characterized by blending a second methacrylic copolymer (C) with pulverized material obtained by pulverizing a part or all of a vehicle lamp including a lamp housing made from the molded body according to

[11] .

[15] A method for producing the molding material according to

[13] or

[14] , further comprising blending a second styrene-based resin (D).

[0012] The present disclosure has the excellent effect of providing a molding material, a molded body, a vehicle lamp, and methods for manufacturing these that contain waste resin and yet have excellent impact resistance and heat resistance.

[0013] An example of an embodiment to which the present disclosure is applied will be described below. The present disclosure is not limited to this embodiment, and other embodiments may also fall within the scope of the present disclosure as long as they are consistent with the spirit of the present disclosure. Note that in this disclosure, unless otherwise specified, "to" indicating a numerical range includes the numerical values ​​written before and after it as the lower limit and upper limit.

[0014] [Molding Material] The molding material of the present disclosure comprises a lamp cover containing a first methacrylic copolymer (A) having a glass transition temperature of 100 to 121°C as measured by a method in accordance with JIS K7121, and one or more resins selected from the group consisting of ABS resin, AES resin, and ASA resin having a notched Charpy impact value of 20 kJ / m as measured by a method in accordance with JIS K7111-1 / 1eA. ２ and a second methacrylic copolymer (C) having a glass transition temperature of 122 to 150°C.

[0015] The molding material of the present disclosure further comprises one or more resins selected from the group consisting of ABS resin, AES resin, and ASA resin, each of which has a notched Charpy impact value of 20 kJ / m ２ In the molding material of the present disclosure, the content of the first methacrylic copolymer (A) is 5 to 40 mass %, the content of the first styrene resin (B) is 10 to 55 mass %, and the content of the second methacrylic copolymer (C) is 5 to 50 mass %.

[0016] (First methacrylic copolymer (A)) The content of the first methacrylic copolymer (A) in the molding material of the present disclosure is 5 to 40% by mass relative to the total of the first methacrylic copolymer (A), the first styrene-based resin (B), the second methacrylic copolymer (C), and the optionally added second styrene-based resin (D). The lower limit is preferably 12% by mass, more preferably 15% by mass. The upper limit is preferably 38% by mass, more preferably 35% by mass. When the content of the first methacrylic copolymer (A) is equal to or greater than the lower limit, the molding material of the present disclosure exhibits excellent surface hardness, and when the content of the first methacrylic copolymer (A) is equal to or less than the upper limit, the molding material exhibits excellent heat resistance.

[0017] In the present disclosure, the first methacrylic copolymer (A) refers to a methacrylic copolymer other than the second methacrylic copolymer (C) described below. In one embodiment, the proportion of structural units derived from a methacrylic acid ester in the first methacrylic copolymer (A) is, for example, 80% by mass or more, preferably 90% by mass or more, and more preferably 95% by mass or more. Examples of methacrylic acid esters include methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, s-butyl methacrylate, t-butyl methacrylate, amyl methacrylate, isoamyl methacrylate, n-hexyl methacrylate, 2-ethylhexyl methacrylate, pentadecyl methacrylate, dodecyl methacrylate, phenyl methacrylate, benzyl methacrylate, phenoxyethyl methacrylate, 2-hydroxyethyl methacrylate, 2-ethoxyethyl methacrylate, glycidyl methacrylate, allyl methacrylate, cyclohexyl methacrylate, norbornenyl methacrylate, and isobornyl methacrylate, with methyl methacrylate being preferred. Methacrylic acid esters can be used alone or in combination of two or more. The first methacrylic copolymer (A) may contain structural units derived from a monomer other than a methacrylic acid ester. Such other monomers are preferably acrylic acid esters. The content of structural units derived from an acrylic acid ester in the first methacrylic copolymer (A) is preferably 20% by mass or less, more preferably 10% by mass or less, and even more preferably 5% by mass or less.

[0018] Examples of such acrylic acid esters include methyl acrylate (hereinafter referred to as "MA"), ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, tert-butyl acrylate, hexyl acrylate, 2-ethylhexyl acrylate, nonyl acrylate, decyl acrylate, dodecyl acrylate, stearyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, cyclohexyl acrylate, 2-methoxyethyl acrylate, 3-methyl acrylate, 4-methyl-2-propanol ... Examples of acrylate esters include butyl acrylate, trifluoromethyl acrylate, trifluoroethyl acrylate, pentafluoroethyl acrylate, glycidyl acrylate, allyl acrylate, phenyl acrylate, toluyl acrylate, benzyl acrylate, isobornyl acrylate, and 3-dimethylaminoethyl acrylate, and from the viewpoint of availability, preferred are MA, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, and tert-butyl acrylate, with MA and ethyl acrylate being more preferred, and MA being most preferred. The acrylic esters can be used alone or in combination of two or more.

[0019] The first methacrylic copolymer (A) according to the present disclosure can be obtained by polymerizing the above-mentioned methacrylic acid ester and other optional monomers. When multiple types of monomers are used in this polymerization, the multiple types of monomers are usually mixed to prepare a monomer mixture, which is then subjected to polymerization. There are no particular restrictions on the polymerization method, but from the viewpoint of productivity, radical polymerization is preferably performed by a method such as bulk polymerization, suspension polymerization, solution polymerization, or emulsion polymerization.

[0020] The weight average molecular weight (hereinafter referred to as "Mw") of the first methacrylic copolymer (A) according to the present disclosure is preferably 40,000 to 400,000, more preferably 45,000 to 200,000, and even more preferably 50,000 to 180,000. Having an Mw of 40,000 or more provides the molding material of the present disclosure with excellent mechanical strength, while having an Mw of 400,000 or less provides excellent fluidity, thereby improving the molding processability of the molding material of the present disclosure. The weight average molecular weight (Mw) in this specification is the weight average molecular weight calculated in terms of standard polymethyl methacrylate (PMMA) as determined by gel permeation chromatography (GPC) analysis using a differential refractive index detector.

[0021] The glass transition temperature of the first methacrylic copolymer (A) according to the present disclosure is 100 to 121°C, preferably 103 to 120°C, and more preferably 105 to 119°C. When the glass transition temperature is 100°C or higher, the molding material of the present disclosure exhibits excellent heat resistance, and when the glass transition temperature is 121°C or lower, the molding material of the present disclosure exhibits excellent moldability. Note that the glass transition temperature in this specification is the temperature measured in accordance with JIS K7121 using a differential scanning calorimeter at a heating rate of 10°C / min and calculated by the midpoint method.

[0022] (First styrene-based resin (B)) The content of the first styrene-based resin (B) in the molding material of the present disclosure (total amount if multiple types are used unless otherwise specified) is 10 to 55% by mass relative to the total of the first methacrylic copolymer (A), the first styrene-based resin (B), the second methacrylic copolymer (C), and the second styrene-based resin (D) added as needed. The lower limit is preferably 12% by mass, more preferably 15% by mass. The upper limit is preferably 53% by mass, more preferably 50% by mass. When the content of the first styrene-based resin (B) is equal to or greater than the lower limit, the molding material of the present disclosure has excellent impact resistance, and when the content is equal to or less than the upper limit, the molding material has excellent heat resistance.

[0023] The first styrene-based resin (B) is selected from the group consisting of ABS (Acrylonitrile-Butadiene-Styrene) resin, AES (Acrylonitrile-EPDM-Styrene) resin, and ASA (Acrylate-Styrene-Acrylonitrile) resin, and one type may be used or two or more types may be used in combination.

[0024] ABS resin, AES resin, and ASA resin are graft copolymers obtained by graft copolymerizing at least a styrene-based monomer and an acrylonitrile-based monomer onto a rubber-like polymer. For example, when a butadiene-based rubber such as polybutadiene or a styrene-butadiene copolymer is used as the rubber-like polymer, the resin is an ABS resin. When an ethylene-based rubber such as an ethylene-α-olefin copolymer is used, the resin is an AES resin. When an acrylic rubber such as butyl acrylate or ethyl acrylate is used, the resin is an ASA resin. Two or more of these rubber-like polymers may be used during graft copolymerization.

[0025] The glass transition temperature of the rubber copolymer is preferably 0°C or lower, more preferably -50°C or lower, and even more preferably -70°C or lower.

[0026] The mass average particle diameter of the rubber copolymer is not particularly limited, but is preferably 0.1 to 0.35 μm, more preferably 0.12 to 0.33 μm, and even more preferably 0.15 to 0.3 μm. A mass average particle diameter of 0.1 μm or more further improves impact resistance. Furthermore, a mass average particle diameter of 0.35 μm or less further improves design properties such as jet blackness and further suppresses haze. The mass average particle diameter can be measured by observing the rubber copolymer with a transmission electron microscope.

[0027] The polymer to be grafted onto the rubber copolymer is not particularly limited, but examples thereof include acrylonitrile-styrene copolymer, acrylonitrile-α-methylstyrene copolymer, acrylonitrile-styrene-butyl acrylate copolymer, acrylonitrile-styrene-methyl methacrylate copolymer, acrylonitrile-styrene-N-phenylmaleimide copolymer, etc. Of these, acrylonitrile-styrene copolymer, acrylonitrile-styrene-butyl acrylate copolymer, and acrylonitrile-styrene-methyl methacrylate copolymer are preferred.

[0028] A known method can be used to produce a graft copolymer such as an ABS resin, for example, a production method by emulsion polymerization and / or continuous bulk polymerization, specifically, an emulsion graft polymerization method in which a copolymer is graft polymerized onto a latex of a rubber component produced by emulsion polymerization.

[0029] The first styrene-based resin (B) is not particularly limited as long as it is within the above range, but AES resin and ASA resin are more preferred because the low double bond content in the rubber copolymer results in excellent weather resistance. Furthermore, acrylic rubber has little impact resistance when a methacrylic copolymer is added, and the molding material of the present disclosure has excellent impact resistance, so ASA resin is particularly preferred.

[0030] The notched Charpy impact value of the first styrene-based resin (B) is 20 kJ / m ２ less than 5 kJ / m ２ It is preferable that the concentration is 7 kJ / m or more. ２ More preferably, it is 9 kJ / m or more. ２ It is particularly preferable that the notched Charpy impact value is 5 kJ / m or more. ２ On the other hand, a styrene-based resin having a history of use as a lamp housing or the like can be used as the first styrene-based resin (B), and in this case, the notched Charpy impact value is 15 kJ / m or more. ２ It may be 10 kJ / m or less, ２ It may be the following:

[0031] The waste resin material contained in the molding material of the present disclosure includes a lamp cover and a lamp housing. One example of the waste resin material is a vehicle lamp. Specific examples of the waste resin material for a vehicle lamp include a lamp cover and a lamp housing, and the lamp cover and the lamp housing are joined at an attachment portion. More specific examples include moldings for headlamps, tail lamps, and fog lamps.

[0032] The waste resin material may be a lamp cover and a lamp housing joined together, and the joining may be by heat fusion. According to the manufacturing method of the molding material of the present disclosure described below, a molding material having excellent impact resistance and heat resistance can be manufactured without separating the lamp cover and the lamp housing.

[0033] The method for pulverizing the waste resin material to obtain the pulverized material is not particularly limited, and any known method can be used.

[0034] The lamp cover contains the first methacrylic copolymer (A) and may contain other thermoplastic resins. The other thermoplastic resins contained in the lamp cover are not particularly limited as long as they are translucent thermoplastic resins that are suitable for lamp covers, for example, having a total light transmittance of 51% or more, and examples thereof include polycarbonate resin (PC), cycloolefin polymer (COP), and cycloolefin copolymer (COC).

[0035] The lamp housing contains the first styrene-based resin (B) and may contain other thermoplastic resins. The other thermoplastic resins contained in the lamp housing are not particularly limited as long as they have heat resistance and impact resistance suitable for a lamp housing, and examples thereof include polypropylene resin (PP).

[0036] The lamp housing is required to block light to a total light transmittance of, for example, 49% or less, and is therefore preferably made opaque by adding a black pigment such as carbon black.

[0037] The method for joining the lamp cover and the lamp housing at the mounting portion is not particularly limited, and can be a heat welding method, an adhesive method, or the like. Various methods such as laser welding, hot plate welding, and vibration welding can be used as the heat welding method. Adhesion methods include sealing with a hot melt adhesive such as a polyamide hot melt, and then fixing and holding the engaging portion between the lamp cover and the lamp housing with a mechanical fastening means such as a clip, lance engagement, or screw. From the viewpoint of the purity of the crushed material of the vehicle lamp molding, a heat welding method is preferred as the joining method.

[0038] The content of the pulverized material in the molding material of the present disclosure is preferably 20 to 80% by mass. The lower limit is preferably 25% by mass, more preferably 30% by mass. The upper limit is preferably 75% by mass, more preferably 70% by mass.

[0039] The content of the first methacrylic copolymer (A) in the pulverized material is preferably 20 to 80% by mass, with the lower limit being preferably 25% by mass, more preferably 30% by mass, and the upper limit being preferably 75% by mass, more preferably 70% by mass.

[0040] The content of the first styrene-based resin (B) in the pulverized material is preferably 20 to 80% by mass. The lower limit is preferably 25% by mass, more preferably 30% by mass. The upper limit is preferably 75% by mass, more preferably 70% by mass.

[0041] (Second Methacrylic Copolymer (C)) The content of the second methacrylic copolymer (C) in the molding material of the present disclosure is 5 to 50% by mass relative to the total of the first methacrylic copolymer (A), the first styrene-based resin (B), the second methacrylic copolymer (C), and the optionally added second styrene-based resin (D). The lower limit is preferably 12% by mass, more preferably 15% by mass. The upper limit is preferably 40% by mass, more preferably 38% by mass. When the content of the second methacrylic copolymer (C) is equal to or greater than the lower limit, the molding material of the present disclosure exhibits excellent heat resistance, and the compatibility between the first methacrylic copolymer (A) and the first styrene-based resin (B) is improved. When the content is equal to or less than the upper limit, the molding material exhibits excellent impact resistance.

[0042] The second methacrylic copolymer (C) may be a methacrylic copolymer (C1) containing methyl methacrylate (MMA) units and α-methylstyrene units. The methacrylic copolymer (C1) may further contain one or more other units (UO).

[0043] The content of MMA units in the methacrylic copolymer (C1) is 10 to 99% by mass. The lower limit is preferably 20% by mass, more preferably 30% by mass, even more preferably 40% by mass, even more preferably 50% by mass, even more preferably 55% by mass, particularly preferably 60% by mass, and most preferably 65% ​​by mass. The upper limit is preferably 95% by mass, more preferably 90% by mass, particularly preferably 85% by mass, and most preferably 80% by mass.

[0044] The content of α-methylstyrene units in the methacrylic copolymer (C1) is 1 to 40% by mass. The lower limit is preferably 5% by mass, more preferably 10% by mass, and particularly preferably 15% by mass. The upper limit is preferably 35% by mass, more preferably 30% by mass, particularly preferably 25% by mass, and most preferably 20% by mass.

[0045] If the content of α-methylstyrene units is less than the lower limit, the heat resistance of the methacrylic copolymer (C1) may be insufficient. If the content of α-methylstyrene units exceeds the upper limit, the polymerizability, thermal decomposition resistance, and moldability of the methacrylic copolymer (C1) may be reduced. If the content of α-methylstyrene units exceeds the upper limit, it may be difficult to control the copolymerization of α-methylstyrene, making it difficult to stably produce a methacrylic copolymer (C1) having a uniform composition, such as the content of α-methylstyrene units. Variations in the composition, such as the content of α-methylstyrene units, may lead to a decrease in heat resistance and mechanical properties, such as rigidity and surface hardness.

[0046] When the MMA unit content and the α-methylstyrene unit content are within the above ranges, the methacrylic copolymer (C1) can have good transparency, heat resistance, thermal decomposition resistance, polymerizability, and moldability. Furthermore, when the MMA unit content and the α-methylstyrene unit content are within the above ranges, the copolymerization of α-methylstyrene in the first methacrylic copolymer (A) is relatively easy to control, and a methacrylic copolymer (C1) having a uniform composition, such as the α-methylstyrene unit content, can be stably produced, and a methacrylic copolymer (C1) having good heat resistance and mechanical properties, such as rigidity and surface hardness, can be stably produced.

[0047] The methacrylic copolymer (C1) can be obtained by copolymerizing methyl methacrylate (MMA), α-methylstyrene, and, if necessary, one or more other monomers (O).

[0048] Examples of the other monomer (O) include vinyl monomers (V) having one polymerizable unsaturated bond per molecule other than methyl methacrylate (MMA) and α-methylstyrene. Examples of the vinyl monomer (V) include (meth)acrylic acid esters other than MMA, such as methyl acrylate; (meth)acrylic acid alkyl esters such as ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate; (meth)acrylic acid aryl esters such as phenyl (meth)acrylate; and (meth)acrylic acid cycloalkyl esters such as cyclohexyl (meth)acrylate and norbornenyl (meth)acrylate. Other examples of the vinyl monomer (V) include (meth)acrylic acid, (meth)acrylamide, and (meth)allylonitrile. Other examples of the vinyl monomer (V) include styrene (St); alkyl-substituted styrenes such as o-, m-, or p-methylstyrene, 2,4-dimethylstyrene, 2,5-dimethylstyrene, 3,4-dimethylstyrene, 3,5-dimethylstyrene, o-, m-, or p-ethylstyrene; and aromatic vinyl compounds other than α-methylstyrene, such as 1,1-diphenylethylene. From the viewpoints of the melt flowability and productivity of the methacrylic copolymer (C1), styrene (St) and the like are preferred.

[0049] The methacrylic copolymer (C1) may contain, as the one or more other units (UO), one or more ring structural units (UR) selected from the group consisting of an acid anhydride unit, an imide unit having a ring structure, and a lactone ring unit, instead of or in addition to an aromatic vinyl compound unit other than an α-methylstyrene unit. A methacrylic copolymer (C1) containing a ring structural unit (UR) is preferred because it has high heat resistance.

[0050] The methacrylic copolymer (C1) having no cyclic structural unit (UR) in the main chain can be produced by copolymerizing a monomer mixture containing methyl methacrylate (MMA) and α-methylstyrene, and optionally one or more other monomers (O), by a known method. Examples of methods for producing the methacrylic copolymer (C1) having a cyclic structural unit (UR) in the main chain include a method of copolymerizing, by a known method, multiple monomers including methyl methacrylate (MMA), α-methylstyrene, raw material monomers for the cyclic structural unit (UR), and optionally other monomers (O); and a method of copolymerizing, by a known method, a methacrylic copolymer having MMA units and α-methylstyrene units but no cyclic structural unit (UR), and then introducing a cyclic structure into the main chain to form the cyclic structural unit (UR). Examples of the polymerization method for the methacrylic copolymer (C1) include radical polymerization methods such as (continuous) bulk polymerization, suspension polymerization, solution polymerization, and emulsion polymerization; and anionic polymerization.

[0051] The content of the ring structural unit (UR) in the methacrylic copolymer (C1) (the total amount when there are multiple types of ring structural units unless otherwise specified) is 0 to 60% by mass. The lower limit is preferably 5% by mass. The upper limit is preferably 55% by mass, more preferably 50% by mass, even more preferably 40% by mass, particularly preferably 30% by mass, and most preferably 20% by mass.

[0052] Examples of the ring structure unit (UR) include an acid anhydride unit, an imide unit containing a ring structure, a lactone ring unit, etc. Examples of the acid anhydride unit include a maleic anhydride (Mah) unit, a glutaric anhydride unit, an itaconic anhydride unit, etc., and the maleic anhydride (Mah) unit is preferred.

[0053] Examples of the imide unit containing a ring structure include an unsubstituted or N-substituted glutarimide unit and an unsubstituted or N-substituted maleimide unit.

[0054] The glutarimide (GI) unit is a unit having an unsubstituted or N-substituted 2,6-dioxopiperidinediyl structure, and examples thereof include units represented by the following general formula (I):

[0055]

[0056] In formula (I), two R １ are each independently a hydrogen atom or a methyl group, and two R １ Preferably, both R are methyl groups. ２ represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, or an organic group having 6 to 15 carbon atoms and containing an aromatic ring, and is preferably a hydrogen atom, a methyl group, an n-butyl group, a cyclohexyl group, or a benzyl group, more preferably a methyl group, an n-butyl group, or a cyclohexyl group, and particularly preferably a methyl group.

[0057] The methacrylic copolymer (C1) containing glutarimide (GI) units can have properties such as a high glass transition temperature (Tg), good impact resistance, and good dimensional and shape stability against temperature. The methacrylic copolymer (C1) containing glutarimide (GI) units can be produced by known methods described in WO 2005 / 108438, JP 2010-254742 A, JP 2008-273140 A, and JP 2008-274187 A, etc.

[0058] The production method may include an imide cyclization reaction step in which an imidization agent is added to a precursor resin having two adjacent methyl methacrylate (MMA) units and reacted. Examples of the imidization agent include ammonia; aliphatic hydrocarbon group-containing amines such as methylamine (also called monomethylamine), ethylamine, diethylamine, n-propylamine, isopropylamine, n-butylamine, isobutylamine, t-butylamine, and n-hexylamine; aromatic hydrocarbon group-containing amines such as aniline, toluidine, trichloroaniline, and n-methylbenzylamine; alicyclic hydrocarbon group-containing amines such as cyclohexylamine and n-methylcyclohexylamine; and urea compounds such as urea, 1,3-dimethylurea, 1,3-diethylurea, and 1,3-dipropylurea. Among these, methylamine is preferred.

[0059] The unsubstituted or N-substituted maleimide unit is a unit having an unsubstituted or N-substituted 2,5-pyrrolidinedione structure, and includes a unit represented by the following formula (II) (also referred to as maleimide unit (II)).

[0060]

[0061] In formula (II), two R １１ are each independently a hydrogen atom or a methyl group, and two R １１ Preferably, both R are methyl groups. １２ represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, or an organic group having 6 to 15 carbon atoms and containing an aromatic ring, and is preferably a methyl group, an n-butyl group, a cyclohexyl group, or a benzyl group, more preferably a methyl group, an n-butyl group, or a benzyl group, and particularly preferably a methyl group.

[0062] Examples of methods for producing the methacrylic copolymer (C1) containing the maleimide unit (II) include a method of polymerizing a monomer mixture containing a monomer containing a maleimide unit, and a method of reacting the maleic anhydride unit in the polymerization reaction product of a monomer mixture containing maleic anhydride with an imidizing agent. For the latter method, see JP-B Nos. 61-026924, 7-042332, 9-100322, and 2001-329021.

[0063] Examples of the monomer containing the maleimide unit (II) include N-alkylmaleimides such as N-methylmaleimide, N-ethylmaleimide, N-butylmaleimide, and N-cyclohexylmaleimide (ChMI); and N-arylmaleimides such as N-phenylmaleimide (PhMI), N-methylphenylmaleimide, and N-chlorophenylmaleimide. N-cyclohexylmaleimide (ChMI) and N-phenylmaleimide (PhMI) are preferred.

[0064] A lactone ring unit is a unit containing a >CH—O—C(═O)— group in its ring structure. The unit containing a >CH—O—C(═O)— group in its ring structure preferably has 4 to 8, more preferably 5 to 6, and most preferably 6, ring constituent elements. Examples of units containing a >CH—O—C(═O)— group in its ring structure include lactone diyl units such as β-propiolactone diyl unit, γ-butyrolactone diyl unit, and δ-valerolactone diyl unit. In the formula, ">C" means that the carbon atom C has two bonds.

[0065] For example, the δ-valerolactonediyl unit may be a unit represented by the following formula (III) (also referred to as lactone ring unit (III)).

[0066] In formula (III), R ２１ , R ２２ , and R ２３ are each independently a hydrogen atom or an organic group having 1 to 20 carbon atoms, preferably a hydrogen atom or an organic group having 1 to 10 carbon atoms, more preferably a hydrogen atom or an organic group having 1 to 5 carbon atoms. Here, the organic group is not particularly limited as long as it has 1 to 20 carbon atoms, and examples thereof include a linear or branched alkyl group, a linear or branched aryl group, -OCOCH ３ The organic group may contain a heteroatom such as an oxygen atom. ２２ is a methyl group, and R ２１ and R ２３ is a hydrogen atom.

[0067] The lactone ring unit (III) can be obtained by intramolecular cyclization of a hydroxy group and an ester group, for example, by intramolecular cyclization of a 2-(hydroxyalkyl)acrylate unit and a methyl (meth)acrylate unit (see JP-A Nos. 2000-230016, 2001-151814, 2002-120326, 2002-254544, and 2005-146084).

[0068] The glutaric anhydride unit is a unit having a 2,6-dioxodihydropyrandiyl structure, and examples thereof include a unit represented by formula (IV) (also referred to as glutaric anhydride unit (IV)).

[0069]

[0070] In formula (IV), two R ３１ are each independently a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and are preferably a methyl group.

[0071] The glutaric anhydride unit (IV) can be obtained by intramolecular cyclization of two adjacent (meth)acrylic acid units, or intramolecular cyclization of a (meth)acrylic acid unit and a methyl (meth)acrylate unit, etc. See JP-A-2007-197703 and JP-A-2010-96919, etc.

[0072] The second methacrylic copolymer (C) may be a methacrylic copolymer (C2) having a triad syndiotacticity (rr) of 70% or more.

[0073] The syndiotacticity (rr) of the methacrylic copolymer (C2) in triad notation is preferably 70% or more, more preferably 70 to 90%, and even more preferably 70 to 80%. By having such a syndiotacticity of 70% or more, the heat resistance of the molding material of the present disclosure can be increased.

[0074] Here, the syndiotacticity (rr) expressed as a triad (hereinafter sometimes simply referred to as "syndiotacticity (rr)") is the proportion of two chains (diads) in a chain of three consecutive structural units (triad) that are both racemo (denoted as rr). Note that in the chains (diads) of structural units in a polymer molecule, those with the same steric configuration are called meso and those with the opposite configuration are called racemo, and are denoted as m and r, respectively.

[0075] The syndiotacticity (rr) (%) of the triad is determined in deuterated chloroform at 30°C. １The H-NMR spectrum is measured, and the area (X) of the region from 0.6 to 0.95 ppm and the area (Y) of the region from 0.6 to 1.35 ppm when TMS is set to 0 ppm are measured from the spectrum, and the rr can be calculated using the formula: (X / Y) × 100. When two or more second methacrylic copolymers (C) having different rr are used in combination, rr can be determined by the additivity rule based on the mass ratio.

[0076] The weight average molecular weight (Mw) of the second methacrylic copolymer (C) is not particularly limited and is preferably 40,000 to 400,000. The lower limit is more preferably 50,000, and particularly preferably 60,000. The upper limit is more preferably 300,000, and particularly preferably 200,000. When the Mw of the second methacrylic copolymer (C) is equal to or greater than the lower limit, the copolymer can have excellent mechanical properties, and when the Mw is equal to or less than the upper limit, the copolymer can have excellent melt fluidity and molding processability.

[0077] The glass transition temperature (Tg) of the second methacrylic copolymer (C) is 122°C or higher. The lower limit is preferably 123°C, more preferably 125°C, particularly preferably 130°C, and most preferably 135°C. The upper limit is not particularly limited and is, for example, 150°C. The higher the Tg, the higher the heat resistance of the second methacrylic copolymer (C), which is preferable. A molded article containing a second methacrylic copolymer (C) with a high Tg is less likely to deform and / or shrink due to heat, and is therefore preferable.

[0078] (Second styrene-based resin (D)) The molding material of the present disclosure may contain a second styrene-based resin (D), and the content thereof is preferably 5 to 60 mass% relative to the total of the first methacrylic copolymer (A), the first styrene-based resin (B), the second methacrylic copolymer (C), and the second styrene-based resin (D), more preferably 10 to 55 mass%, and even more preferably 10 to 50 mass%. By having the content of the second styrene-based resin (D) within the above range, the molding material can achieve both high levels of heat resistance and impact resistance.

[0079] In the present disclosure, the second styrene-based resin (D) is intended to be a styrene-based resin that, unlike the above-mentioned first styrene-based resin (B), has no history of use as a lamp housing or the like. That is, the second styrene-based resin (D) is a material that has not been subjected to thermal history during molding or degradation due to heat or light in the usage environment of a vehicle lamp or the like, and has high impact resistance. The notched Charpy impact value of the second styrene-based resin (D) is 20 kJ / m ２ It is preferable that the concentration is 25 kJ / m or more. ２ More preferably, it is 30 kJ / m or more. ２ It is particularly preferable that the notched Charpy impact value is 20 kJ / m or more. ２ By satisfying the above, a molding material having excellent impact resistance can be produced.

[0080] As the type of the second styrene-based resin (D), the same resins as those used for the first styrene-based resin (B) described above can be used, such as ABS resin, AES resin, ASA resin, and AS resin, and from the viewpoint of impact resistance, ABS resin, AES resin, and ASA resin are preferred.

[0081] The impact resistance of a styrene-based resin depends on the content of the rubber-like polymer, the glass transition temperature of the rubber-like polymer, the dispersed particle size and particle size distribution of the rubber-like polymer in the matrix resin, the amount of graft copolymerization onto the rubber-like polymer, etc. A preferred second styrene-based resin (D) of the present disclosure has a notched Charpy impact value of 20 kJ / m ２ To achieve the above, it is important to set these factors appropriately.

[0082] The content of the rubbery polymer in the second styrene-based resin (D) is preferably 10 to 50% by mass, more preferably 15 to 40% by mass. When the content of the rubbery polymer is 10% by mass or more, impact resistance is improved, and when the content is 50% by mass or less, fluidity during molding processing is improved. The content of the rubbery polymer in the second styrene-based resin (D) is determined by adding methyl ethyl ketone to the styrene-based resin, stirring at a temperature of 23°C for 24 hours, separating the insoluble matter by centrifugation for 60 minutes under conditions of a temperature of -9°C and a rotation speed of 20,000 rpm, allowing to stand for 30 minutes, separating the supernatant, drying the remaining insoluble matter under reduced pressure, weighing the weight of the obtained insoluble matter, and calculating the ratio of the weight of the insoluble matter to the weight of the original styrene-based resin.

[0083] The rubbery polymer in the second styrene-based resin (D) is rubbery at a temperature in the environment where impact resistance is required, and has a difference in elastic modulus between it and the glassy matrix resin, which allows efficient improvement of impact resistance due to stress concentration in the rubbery polymer. Therefore, the glass transition temperature of the rubbery polymer is preferably −100° C. to −10° C., more preferably −100° C. to −60° C.

[0084] The dispersed particle diameter of the rubbery polymer in the second styrene-based resin (D) in the matrix resin is preferably 100 to 500 nm, more preferably 150 to 400 nm. Having the dispersed particle diameter in this range results in good impact resistance. From the viewpoint of achieving both impact resistance and other physical properties such as color development, the composition may contain a plurality of rubbery polymers with different dispersed particle diameters, for example, a rubbery polymer with a small particle diameter of 50 to 200 nm and a rubbery polymer with a large particle diameter of 200 to 500 nm.

[0085] The graft copolymer onto the rubbery polymer in the second styrene-based resin (D) is preferably one that has excellent affinity with the matrix resin, from the viewpoint of improving the adhesive strength at the interface between the rubbery polymer and the matrix resin and improving impact resistance. For example, when the matrix resin contains an AS resin consisting of 30% by mass of acrylonitrile units and 70% by mass of styrene units, the graft copolymer onto the rubbery polymer preferably has a composition consisting of 15 to 45% by mass of acrylonitrile units and 55 to 85% by mass of styrene units. The amount of such graft copolymer relative to the rubbery polymer is preferably 25 to 150 parts by mass per 100 parts by mass of the rubbery polymer.

[0086] (Other Optional Components) The molding material of the present disclosure may contain a filler as needed, as long as the effects of the present disclosure are not impaired. Examples of fillers include calcium carbonate, talc, carbon black, titanium oxide, silica, clay, barium sulfate, magnesium carbonate, etc. The amount of filler that can be contained in the molding material of the present disclosure is preferably 3% by mass or less, more preferably 1.5% by mass or less.

[0087] The molding material of the present disclosure may contain other polymers as long as the effects of the present disclosure are not impaired. Examples of other polymers include polyolefin resins such as polyethylene, polypropylene, polybutene-1, poly-4-methylpentene-1, and polynorbornene; ethylene-based ionomers; styrene-based resins other than those listed as the first styrene-based resin (B), such as polystyrene, styrene-maleic anhydride copolymer, high-impact polystyrene, MBS resin, and SAS resin; methyl methacrylate-styrene copolymers; polyester resins such as polyethylene terephthalate and polybutylene terephthalate; polyamides such as nylon 6, nylon 66, and polyamide elastomers; polyvinyl chloride and polyvinyl chloride. Examples of suitable methacrylic molding materials include acrylic resins such as ethylene, polyvinyl alcohol, ethylene-vinyl alcohol copolymers, polyacetal, polyvinylidene fluoride, polyurethane, phenoxy resin, modified polyphenylene ether, polyphenylene sulfide, and silicone-modified resins; silicone rubber; acrylic multilayer copolymer elastomers; acrylic thermoplastic elastomers such as diblock and triblock copolymers of methyl methacrylate polymer block and n-butyl acrylate polymer block; styrene thermoplastic elastomers such as SEPS, SEBS, and SIS; and olefin rubbers such as IR, EPR, and EPDM. The amount of other polymers that can be contained in the methacrylic molding material of the present disclosure is preferably 10% by mass or less, more preferably 5% by mass or less, and most preferably 0% by mass.

[0088] The molding material of the present disclosure may contain additives such as antioxidants, heat degradation inhibitors, ultraviolet absorbers, light stabilizers, lubricants, mold release agents, polymer processing aids, antistatic agents, flame retardants, dyes and pigments, light diffusing agents, organic dyes, matting agents, and fluorescent materials, as long as the effects of the present disclosure are not impaired.

[0089] The antioxidant is effective in preventing oxidative degradation of the resin by itself in the presence of oxygen. Examples include phosphorus-based antioxidants, hindered phenol-based antioxidants, and thioether-based antioxidants. These antioxidants can be used alone or in combination of two or more. Among these, from the viewpoint of the effect of preventing deterioration of optical properties due to coloration, phosphorus-based antioxidants and hindered phenol-based antioxidants are preferred, and a combination of a phosphorus-based antioxidant and a hindered phenol-based antioxidant is more preferred. When a phosphorus-based antioxidant and a hindered phenol-based antioxidant are used in combination, their ratio is not particularly limited, but the mass ratio of phosphorus-based antioxidant / hindered phenol-based antioxidant is preferably 1 / 5 to 2 / 1, and more preferably 1 / 2 to 1 / 1.

[0090] Examples of phosphorus-based antioxidants include 2,2-methylenebis(4,6-di-t-butylphenyl)octyl phosphite (manufactured by ADEKA Corporation; trade name: Adekastab HP-10), tris(2,4-di-t-butylphenyl)phosphite (manufactured by Ciba Specialty Chemicals Corporation; trade name: IRGAFOS168), and 3,9-bis(2,6-di-tert-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane (manufactured by ADEKA Corporation; trade name: Adekastab PEP-36).

[0091] Examples of the hindered phenol antioxidant include pentaerythrityl-tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate] (manufactured by Ciba Specialty Chemicals; trade name IRGANOX 1010) and octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate (manufactured by Ciba Specialty Chemicals; trade name IRGANOX 1076).

[0092] The heat deterioration inhibitor is a compound capable of preventing thermal deterioration of a resin by capturing polymer radicals generated when the resin is exposed to high heat in a substantially oxygen-free state. Examples of the heat deterioration inhibitor include 2-t-butyl-6-(3'-t-butyl-5'-methyl-hydroxybenzyl)-4-methylphenyl acrylate (manufactured by Sumitomo Chemical Co., Ltd.; trade name: Sumilizer GM), 2,4-di-t-amyl-6-(3',5'-di-t-amyl-2'-hydroxy-α-methylbenzyl)phenyl acrylate (manufactured by Sumitomo Chemical Co., Ltd.; trade name: Sumilizer GS), 4-t-butyl-2-(5-t-butyl-2-oxo-3H-benzofuran-3-yl)phenyl-3,5-di-t-butyl-4-hydroxybenzoate (manufactured by Chitec Technology; trade name: Levonox 501), 5,7-di-t-butyl-3-(3,4 di-methyl-phenyl)-3H-benzofuran-2-one and 5,7-di-t-butyl-3-(3,4-di-propyl-phenyl)-3H-benzofuran-2-one (manufactured by BASF; trade name: HP-136).

[0093] An ultraviolet absorber is a compound that has the ability to absorb ultraviolet rays and is said to have the function of converting light energy into heat energy.

[0094] Examples of ultraviolet absorbers include benzophenones, benzotriazoles, triazines, benzoates, salicylates, cyanoacrylates, oxalic acid anilides, malonic acid esters, and formamidines. These may be used alone or in combination of two or more. Among these, benzotriazoles, triazines, or compounds having a molar absorption coefficient of 0.1 to 0.5 times the maximum value ε at wavelengths of 380 to 450 nm are particularly preferred. ｍａｘ is 1200dm ３ ・mol －１ cm －１ The following ultraviolet absorbers are preferred:

[0095] Light stabilizers are compounds that are said to have the function of capturing radicals generated mainly by oxidation due to light, and examples thereof include hindered amines such as compounds having a 2,2,6,6-tetraalkylpiperidine skeleton.

[0096] Examples of lubricants include stearic acid, behenic acid, stearamidic acid, methylene bisstearamide, hydroxystearic acid triglyceride, paraffin wax, ketone wax, octyl alcohol, and hardened oil.

[0097] The mold release agent is a compound that functions to facilitate the release of a molded product from a mold, and examples thereof include higher alcohols such as cetyl alcohol and stearyl alcohol; glycerin higher fatty acid esters such as stearate monoglyceride and stearate diglyceride; etc. The use of glycerin higher fatty acid esters can cause gel-like foreign matter, so it is preferable to use higher alcohols.

[0098] Polymer processing aids are compounds that are effective in achieving thickness accuracy and thinning when molding acrylic molding materials. Polymer processing aids are usually produced by emulsion polymerization. Polymer processing aids are preferably polymer particles with a particle size of 0.05 to 0.5 μm.

[0099] The polymer particles may be single-layer particles made of a polymer with a single composition ratio and a single intrinsic viscosity, or may be multi-layer particles made of two or more polymers with different composition ratios or intrinsic viscosities. Among these, preferred are particles with a two-layer structure having an inner polymer layer with a low intrinsic viscosity and an outer polymer layer with a high intrinsic viscosity of 5 dl / g or more. The polymer processing aid preferably has an intrinsic viscosity of 3 to 6 dl / g. From the viewpoints of achieving a high moldability improvement effect and avoiding a decrease in the melt fluidity of the molding material, the intrinsic viscosity is preferably in the above range.

[0100] Examples of the antistatic agent include alkyl sulfonates such as sodium heptyl sulfonate, sodium octyl sulfonate, sodium nonyl sulfonate, sodium decyl sulfonate, sodium dodecyl sulfonate, sodium cetyl sulfonate, sodium octadecyl sulfonate, sodium diheptyl sulfonate, potassium heptyl sulfonate, potassium octyl sulfonate, potassium nonyl sulfonate, potassium decyl sulfonate, potassium dodecyl sulfonate, potassium cetyl sulfonate, potassium octadecyl sulfonate, potassium diheptyl sulfonate, lithium heptyl sulfonate, lithium octyl sulfonate, lithium nonyl sulfonate, lithium decyl sulfonate, lithium dodecyl sulfonate, lithium cetyl sulfonate, lithium octadecyl sulfonate, and lithium diheptyl sulfonate.

[0101] Examples of the flame retardant include metal hydrates having a hydroxyl group or water of crystallization, such as magnesium hydroxide, aluminum hydroxide, hydrated aluminum silicate, hydrated magnesium silicate, and hydrotalcite; phosphate compounds, such as polyamine phosphate and phosphate esters; and silicon compounds. Of these, preferred are phosphate ester-based flame retardants, such as trimethyl phosphate, triethyl phosphate, tripropyl phosphate, tributyl phosphate, tripentyl phosphate, trihexyl phosphate, tricyclohexyl phosphate, triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, dimethylethyl phosphate, methyldibutyl phosphate, ethyldipropyl phosphate, and hydroxyphenyldiphenyl phosphate.

[0102] Examples of dyes and pigments include red organic pigments such as Para Red, Fire Red, Pyrazolone Red, Thioindiko Red, and Perylene Red, blue organic pigments such as Cyanine Blue and Indanthrene Blue, green organic pigments such as Cyanine Green and Naphthol Green, and black pigments such as carbon black, with black pigments such as carbon black being preferred. These may be used alone or in combination of two or more.

[0103] As the organic dye, a compound having a function of converting ultraviolet light into visible light is preferably used.

[0104] Examples of the light diffusing agent and the matting agent include glass particles, polysiloxane-based crosslinked particles, crosslinked polymer particles, talc, calcium carbonate, and barium sulfate.

[0105] Examples of the fluorescent substance include fluorescent pigments, fluorescent dyes, fluorescent white dyes, fluorescent brighteners, fluorescent bleaches, and the like.

[0106] These additives may be used alone or in combination of two or more. In addition, these additives may be added to the polymerization reaction solution when producing the first methacrylic copolymer (A), the first styrene-based resin (B), the second methacrylic copolymer (C), and the second styrene-based resin (D), or may be added to the produced first methacrylic copolymer (A), the first styrene-based resin (B), the second methacrylic copolymer (C), and the second styrene-based resin (D), or may be added when preparing the molding material of the present disclosure. The total amount of additives contained in the molding material of the present disclosure is preferably 7% by mass or less, more preferably 5% by mass or less, and even more preferably 4% by mass or less, relative to the molding material, from the viewpoint of suppressing poor appearance of the molded body.

[0107] (Physical Properties of Molding Material) The molding material of the present disclosure has a notched Charpy impact value of 10 kJ / m or less, measured by a method conforming to JIS K7111-1 / 1eA. ２ or more, and 11 kJ / m ２ ~50 kJ / m ２ It is preferable that the ２ ~40 kJ / m ２ More preferably, it is 13 kJ / m ２ ~30 kJ / m ２ It is more preferable that:

[0108] The molding material of the present disclosure has a Vicat softening temperature measured by the method described in JIS K7206 B50 method of 110 ° C. or higher, preferably 111 ° C. to 140 ° C., more preferably 112 ° C. to 135 ° C., and even more preferably 115 ° C. to 130 ° C.

[0109] (Method for Producing Molding Material) The method for preparing the molding material of the present disclosure is not particularly limited. For example, a method can be mentioned in which a pulverized material obtained by pulverizing waste resin material including a lamp cover containing a first methacrylic copolymer (A) and a lamp housing containing a first styrene-based resin (B) is melt-kneaded with a second methacrylic copolymer (C), and, if necessary, a second styrene-based resin (D). During melt-kneading, other polymers, additives, etc. may be mixed as needed, or the pulverized material may be mixed and then mixed with the second methacrylic copolymer (C), the second styrene-based resin (D), other polymers, and additives, or other methods may be used. Kneading can be performed using known mixing or kneading devices such as a kneader-ruder, extruder, mixing roll, or Banbury mixer. Of these, a twin-screw extruder is preferred.

[0110] At least a portion of the molding material of the present disclosure may be a pulverized product of a previously manufactured molded body of the present disclosure or a processed product of the pulverized product. Examples of the processed product include strands, pellets, and the like.

[0111] The molding material of the present disclosure can be made into a form such as pellets to enhance convenience in storage, transportation, or molding.

[0112] [Molded Body] The molded body of the present disclosure includes the molding material of the present disclosure. The method for producing the molded body of the present disclosure is not particularly limited. Examples include melt molding methods such as the T-die method (lamination method, co-extrusion method, etc.), inflation method (co-extrusion method, etc.), compression molding, blow molding, calendar molding, vacuum molding, injection molding (insert method, two-color method, press method, core-back method, sandwich method, etc.), and solution casting. During melt molding, the molding material is typically heated to 200 to 280°C and then processed, with 210 to 270°C being preferred. Since sufficient devolatilization can be achieved in a relatively short time, heating to a temperature above the above-mentioned lower limit is preferred. Sufficient devolatilization can suppress poor appearance of the molded product, such as silver. To avoid poor appearance due to silver scorching caused by thermal decomposition, heating to a temperature below the above-mentioned upper limit is preferred.

[0113] The molding material of the present disclosure and the molded article containing the same can be used as components for various applications.Specific applications include, for example, furniture, household goods, storage and stockpiling supplies, building materials such as walls and roofs, toys and play equipment, gaming applications such as pachinko faces, medical and welfare products, office automation equipment, audiovisual equipment, battery electrical equipment, lighting equipment, body parts for ships and aircraft structures, and interior and exterior components for automobiles, and are particularly suitable for use in vehicle applications such as body parts and interior and exterior components; electrical and electronic applications, etc.

[0114] As vehicle applications, the composition can be suitably used for automobile interior parts such as automobile side visors, rear visors, head wings, headlight covers, instrument panel peripheral parts, air conditioner vents, dashboards, and console boxes, as well as automobile exterior parts such as mirror housings, spoilers, pillar garnishes, wheel caps, lamp housings, bumpers, front grilles, rear grilles, and license plate garnishes.

[0115] Examples of electrical and electronic applications include display devices (e.g., personal computers, game consoles, televisions, car navigation systems, electronic paper, mobile phones, tablet devices, etc.), printers, copy machines, scanners, dryer vents, electric kettle parts, fax machines, electronic organizers, electronic desk calculators, electronic dictionaries, cameras, video cameras, battery packs, recording medium drives, recording medium readers, mice, numeric keypads, CD players, MD players, portable radios and audio players, etc. In particular, they can be suitably used for housings for televisions, personal computers, car navigation systems, electronic paper, mobile phones, tablet devices, etc.

[0116] The vehicle lamp of the present disclosure comprises a lamp housing molded from the molding material of the present disclosure and a lamp cover. The vehicle lamp may be formed by joining the lamp housing and the lamp cover.

[0117] The lamp cover is not particularly limited, but may be made of a thermoplastic resin having translucency that is suitable for a lamp cover, such as methacrylic resin, polycarbonate resin (PC), cycloolefin polymer (COP), cycloolefin copolymer (COC), etc.

[0118] The method for joining the lamp cover and the lamp housing is not particularly limited, and can be a thermal welding method, an adhesive method, an integral molding method, or the like. Various methods such as laser welding, hot plate welding, and vibration welding can be used as the thermal welding method. An example of an adhesive method is a method in which the lamp cover and the lamp housing are sealed using a hot melt adhesive such as a polyamide hot melt, and then the engagement portion is fixed and held by a mechanical fastening means such as a clip, lance engagement, or screw. An example of an integral molding method is a method in which a lamp cover material and a lamp housing material are two-color molded. From the viewpoint of the purity of the pulverized material for the vehicle lamp molding, the thermal welding method and the integral molding method are preferred as the joining method.

[0119] The vehicle lamp of the present disclosure may include components such as a light source, a reflector, an extension reflector, etc., in addition to the lamp cover and the lamp housing.

[0120] Examples of vehicle lamps according to the present disclosure include headlamps, tail lamps, fog lamps, and turn signal lamps for automobiles and motorcycles. They can also be used as lamps for ships, railway vehicles, and aircraft.

[0121] The present disclosure will now be described in more detail with reference to examples, but the present disclosure is not limited to these examples.

[0122] Measurements of physical properties etc. were carried out by the following methods.

[0123] (Polymerization Conversion Rate) A gas chromatograph GC-14A manufactured by Shimadzu Corporation was connected to an INERTCAP1 column (df=0.4 μm, 0.25 mm ID×60 m manufactured by GL Sciences Inc.) under the following conditions, and the amount of residual monomer was analyzed under the following conditions, and the polymerization conversion rate was calculated based on the analysis result.

[0124] Injection temperature = 250°C Detector temperature = 250°C Temperature conditions: Hold at 60°C for 5 minutes → Heat to 250°C at 10°C / min → Hold at 250°C for 10 minutes

[0125] (Composition of each unit of precursor polymer) １３ The carbon ratio of the phenyl group of the α-methylstyrene unit, the carbonyl group of the methyl methacrylate unit, the phenyl group of the styrene unit, and the carbonyl group of the maleic anhydride unit was determined by C-NMR, and the composition of each unit was calculated from this.

[0126] (Weight-average molecular weight) A sample solution was prepared by dissolving 4 mg of the resin to be measured in 5 ml of tetrahydrofuran. The column oven temperature was set to 40°C, and 20 μl of the sample solution was injected into the instrument at an eluent flow rate of 0.35 ml / min, and a GPC (gel permeation chromatography) chromatogram was measured. Ten standard polystyrenes with molecular weights ranging from 400 to 5,000,000 were subjected to GPC measurement, and a calibration curve showing the relationship between retention time and molecular weight was created. The Mw of the resin to be measured was determined based on this calibration curve.

[0127] Apparatus: GPC apparatus HLC-8320 manufactured by Tosoh Corporation Separation column: TSKguard column Super HZ-H, TSKgel HZM-M, and TSKgel Super HZ4000 manufactured by Tosoh Corporation connected in series Eluent: tetrahydrofuran Eluent flow rate: 0.35 ml / min Column temperature: 40°C Detection method: differential refractive index (RI)

[0128] (Composition of Each Unit in Methacrylic Copolymer) The α-methylstyrene unit and the styrene unit were the same as the composition of each unit in the precursor polymer. １ Using H-NMR (manufactured by Bruker; trade name ULTRA SHIELD 400 PLUS), the methacrylic copolymer １H-NMR measurement was carried out to determine the content (mol %) of each monomer unit in the methacrylic copolymer, such as an imide unit (glutarimide and maleimide), a methyl methacrylate unit, and an aromatic vinyl unit (α-methylstyrene and styrene), and the content (mol %) was converted to a content (wt %) using the molecular weight of each monomer unit. －１ The absorption intensity of the peak due to the carbonyl unit of maleimide in the vicinity of 1780 cm －１ The imidization rate of maleic anhydride (R ｍ ) was sought. １３ The maleic anhydride content (m) and imidization rate (R ｍ ) and the value calculated by the following formula was taken as the amount of maleic anhydride (M) in the methacrylic copolymer.

[0129] Amount of maleic anhydride (M) = m × (100 - R ｍ ) / 100 Furthermore, using an infrared spectrophotometer, －１ The absorption intensity of the peak derived from the carbonyl of glutarimide in the vicinity of 1700 cm －１ The ratio of glutarimide units to maleimide units in the methacrylic copolymer was determined from the absorption intensity of the nearby peak derived from the carbonyl unit of maleimide. １ The contents of glutarimide units and maleimide units in the methacrylic copolymer were determined from the amount of imide units in the methacrylic copolymer determined by H-NMR and the ratio of glutarimide units to maleimide units.

[0130] (Syndiotacticity (rr) in triad notation) Using a nuclear magnetic resonance apparatus (ULTRA SHIELD 400 PLUS manufactured by Bruker), under the following conditions: １ H-NMR was measured, and the area (X) of the region from 0.6 to 0.95 ppm and the area (Y) of the region from 0.6 to 1.35 ppm when TMS was set to 0 ppm were measured. The value calculated using the formula: (X / Y) x 100 was taken as the syndiotacticity (rr) (%) in triad notation. Solvent: deuterated chloroform. Measured nuclide: １H Measurement temperature: Room temperature Number of measurements: 64

[0131] (Glass transition temperature; Tg) The resin obtained in each Production Example was dissolved in chloroform and reprecipitated with methanol, and the precipitated resin was then vacuum-dried at 100°C for 12 hours or more. The vacuum-dried resin was measured in accordance with JIS K7121 using a differential scanning calorimeter (Shimadzu Corporation, DSC-50 (product number)) by once heating to 250°C, then cooling to room temperature, and then heating from room temperature to 200°C at a rate of 10°C / min. The midpoint glass transition temperature determined from the DSC curve measured during the second heating was taken as the glass transition temperature in the present disclosure.

[0132] (Melt Flow Rate; MFR) The resin obtained in each Production Example was dissolved in chloroform and reprecipitated with methanol, and the precipitated resin was then vacuum dried for 12 hours or more at 100° C. The MFR of the vacuum dried resin was measured in accordance with JIS K7210 under conditions of 230° C. and a load of 3.8 kg.

[0133] (Vicat Softening Temperature; VST) The resins obtained in the examples and comparative examples were press-molded and then machined to obtain test pieces with a thickness of 4 mm, a length of 80 mm, and a width of 10 mm. The Vicat softening temperature of each test piece was measured using an HDT tester 3M-2 (manufactured by Toyo Seiki Seisakusho, Ltd.) in accordance with the method described in JIS K7206, B50 method.

[0134] (Notched Charpy Impact Value) The resins obtained in the Examples and Comparative Examples were press-molded and then machined to obtain test pieces with a thickness of 4 mm, a length of 80 mm, and a width of 10 mm. Each test piece was placed at 23°C and a relative humidity of 50%, and the Charpy impact value was measured according to a method in accordance with JIS K7111-1 / 1eA.

[0135] <Examples of Various Materials> The following materials were used for the first methacrylic copolymer (A), first styrene-based resin (B), and second styrene-based resin (D) according to the present disclosure. Methacrylic copolymer (A): "PARAPET" manufactured by Kuraray (Mw = 167,000, MMA copolymerization ratio = 95.5%, MA copolymerization ratio = 4.5%, glass transition temperature = 114°C, Vicat softening temperature = 110°C, notched Charpy impact value = 1.4 kJ / m ２ Styrene-based resin (B-1): "NOVODUR HH-112" manufactured by INEOS STYROLUTION (ABS resin, Vicat softening temperature = 111°C, glass transition temperature of rubber polymer = -76°C, content of rubber polymer = 14% by mass, notched Charpy impact value = 11 kJ / m ２ Styrene-based resin (B-2): "LURAN S777K" manufactured by INEOS STYROLUTION (ASA resin, Vicat softening temperature = 97°C, glass transition temperature of rubber polymer = -50°C, content of rubber polymer = 28% by mass, notched Charpy impact value = 17 kJ / m ２ Styrene-based resin (D): "NOVODUR 532" manufactured by INEOS STYROLUTION (ABS resin, Vicat softening temperature = 93°C, glass transition temperature of rubber polymer = -81°C, content of rubber polymer = 35% by mass, notched Charpy impact value = 35 kJ / m ２ )

[0136] (Reference Example 1) A 1 mm thick sheet obtained by press-molding a styrene-based resin (B-1) was subjected to a sunshine weatherometer test under the following conditions: black panel temperature 63°C, relative humidity 50%, irradiation method: rainfall (water spray) for 18 minutes out of 120 minutes, irradiation energy 60 W / m ２ The sheet was irradiated with light rays for 1000 hours under the conditions of (a) and (b). The irradiated sheet was crushed to obtain styrene-based resin (B'-1) (considered to be a resin that had deteriorated due to aging outdoors). The Charpy notched impact value of the styrene-based resin (B'-1) was 6 kJ / m. ２ The Vicat softening temperature was 111°C.

[0137] (Reference Example 2) A styrene-based resin (B'-2) was obtained in the same manner as above, except that the styrene-based resin (B-2) was used instead (considered to be a resin that had deteriorated due to aging outdoors). The Charpy notched impact value of the styrene-based resin (B'-2) was 9 kJ / m. ２ The Vicat softening temperature was 97°C.

[0138] Production Example 1 (Precursor Polymer) The precursor polymer (c1) of this production example was produced by the following method.

[0139] Precursor Polymer (c1) 65 parts by mass of purified methyl methacrylate (MMA), 28 parts by mass of α-methylstyrene (αMSt), 7.0 parts by mass of styrene (St), 0.05 parts by mass of 2,2'-azobis(2-methylpropionitrile) (AIBN), and 0.01 parts by mass of n-octyl mercaptan (n-OM) were charged into an autoclave equipped with a stirrer and uniformly dissolved to obtain polymerization raw materials. Nitrogen gas was blown into the reaction raw materials to remove dissolved oxygen to 3 ppm. Next, the atmosphere in a continuous flow tank reactor equipped with a brine cooling condenser was purged with nitrogen gas. The polymerization raw materials were continuously fed into the tank reactor at a constant flow rate so as to achieve an average residence time of 3.0 hours, and bulk polymerization was carried out at a polymerization temperature of 140°C. A liquid containing the precursor polymer was continuously discharged from the tank reactor. The pressure in the tank reactor was adjusted using a pressure regulating valve connected to the brine cooling condenser. The polymerization conversion rate was 36%. Next, the liquid discharged from the reactor was heated to 200°C and supplied to a twin-screw extruder controlled at 245°C. In the twin-screw extruder, volatile components mainly composed of unreacted monomers were separated and removed, and the precursor polymer was extruded as strands. The strands were cut with a pelletizer to obtain precursor polymer (c1). The content of structural units derived from MMA in precursor polymer (c1) was 76 wt%, the content of structural units derived from α-methylstyrene was 16 wt%, the content of structural units derived from styrene was 8 wt%, and the weight average molecular weight was 84,000.

[0140] A twin-screw extruder (manufactured by Nippon Steel Corporation; trade name: TEX30α-77AW-3V) consisting of a transport section, melt-kneading section, devolatilization section, and discharge section, was set at a screw rotation speed of 150 rpm and a temperature of 230 to 250°C. Precursor polymer (c1) was supplied to the transport section at a rate of 15 kg / hr. In the melt-kneading section equipped with a kneading block, monomethylamine was added in an amount adjusted to achieve the glutarimide-derived structural unit content shown in Table 1, and the amount was injected through the additive supply port of the twin-screw extruder, allowing the precursor polymer (c1) to react with monomethylamine. The melt-kneading section was mostly composed of kneading disks, each end of which was fitted with a sealing element. In the devolatilization section, by-products and excess monomethylamine were volatilized from the molten resin that had passed through the melt-kneading section and discharged through multiple vents.

[0141] The molten resin extruded as a strand from a die provided at the end of the discharge section of the twin-screw extruder was cooled in a water tank and then cut with a pelletizer to obtain a pellet-shaped methacrylic copolymer (C1). The methacrylic copolymer (C1) had a content of structural units derived from MMA of 15 wt%, a content of structural units derived from α-methylstyrene of 16 wt%, a content of structural units derived from styrene of 8 wt%, a content of structural units derived from maleic anhydride of 0 wt%, and a content of structural units derived from glutarimide of 61 wt%. The weight-average molecular weight was 84,000, the glass transition temperature was 144°C, and the notched Charpy impact value was 1.2 kJ / m ２ It was.

[0142] <Preparation Example 2> The atmosphere inside a 5 L glass reaction vessel equipped with a stirring blade and a three-way stopcock was purged with nitrogen. At room temperature, 1600 g of toluene, 80 g of 1,2-dimethoxyethane, 73.3 g (42.3 mmol) of a 0.45 M solution of isobutylbis(2,6-di-t-butyl-4-methylphenoxy)aluminum in toluene, and 8.44 g (14.1 mmol) of a 1.3 M solution of sec-butyllithium (solvent: 95% cyclohexane, 5% n-hexane) were added dropwise to the vessel over 30 minutes at 15°C to 20°C while stirring. After the dropwise addition, the mixture was stirred for 90 minutes at 15°C. The color of the solution changed from yellow to colorless. At this point, the polymerization conversion of methyl methacrylate was 100%.

[0143] Next, the amount of Al element is 4×10 －４ ~1 x 10 －３ Range of parts by mass, amount of Li element is 3 × 10 －５ ~5 x 10 －４ The following purification was carried out to achieve a concentration within the range of parts by mass. First, 1500 g of toluene was added to the obtained solution to dilute it. Next, the diluted solution was poured into a large amount of 100 kg of methanol to obtain a precipitate. The precipitate was removed from the solution by filtration and then washed several times. The washed precipitate was dried at 80°C and 140 Pa for 24 hours to obtain a methacrylic copolymer (C2) having Mw of 68,000, Mw / Mn of 1.06, syndiotacticity (rr) of 73%, a glass transition temperature of 130°C, and a content of structural units derived from methyl methacrylate of 100% by mass.

[0144] Examples 1 to 15 According to the formulations shown in Tables 1 and 2, methacrylic copolymer (A), styrene resins (B-1), (B-2), (B'-1), and (B'-2), methacrylic copolymers (C1) to (C2), and styrene resin (D) were mixed together, melt-kneaded at 230°C in a twin-screw extruder with an L / D ratio of 32.5 and a shaft diameter of 62.5 mm, extruded into strands, and cut with a pelletizer to obtain molding materials (M-1) to (M-15). The compositions, physical properties, and evaluation results of the molded bodies of the molding materials are shown in Tables 1 and 2.

[0145]

[0146]

[0147] Comparative Examples 1 to 8: According to the formulations shown in Tables 3 and 4, methacrylic copolymer (A), styrene resins (B-1), (B-2), (B'-1), and (B'-2), methacrylic copolymers (C1) to (C2), and styrene resin (D) were mixed together, melt-kneaded at 230°C in a twin-screw extruder with an L / D ratio of 32.5 and a shaft diameter of 62.5 mm, extruded into strands, and cut with a pelletizer to obtain molding materials (M-15) to (M-22). The compositions, physical properties, and evaluation results of the molded bodies of the molding materials are shown in Tables 3 and 4.

[0148]

[0149]

[0150] As shown in Tables 1 and 2, the molding materials obtained in Examples 1 to 15 were excellent in heat resistance and impact resistance, even though they contained components that had deteriorated under the usage environment. On the other hand, as shown in Tables 3 and 4, the molding materials obtained in Comparative Examples 1 to 8 were inferior to those of the present disclosure, having problems such as low heat resistance and low impact resistance, since they were not within the range of the present disclosure.

[0151] This application claims priority based on Japanese Patent Application No. 2024-108942, filed on July 5, 2024, the disclosure of which is incorporated herein in its entirety by reference.

Claims

1. A lamp cover containing a first methacrylic copolymer (A) having a glass transition temperature of 100 to 121°C as measured by a method in accordance with JIS K7121, and one or more resins selected from the group consisting of ABS resin, AES resin, and ASA resin, and having a notched Charpy impact value of 20 kJ / m as measured by a method in accordance with JIS K7111-1 / 1eA. ２ and a second methacrylic copolymer (C) having a glass transition temperature of 122 to 150°C, and a notched Charpy impact value of 10 kJ / m. ２ The molding material has a Vicat softening temperature of 110°C or higher as measured by a method in accordance with the method described in JIS K7206 B50 method, and contains 5 to 40% by mass of a first methacrylic copolymer (A), 10 to 55% by mass of a first styrene-based resin (B), and 5 to 50% by mass of a second methacrylic copolymer (C).

2. The molding material according to claim 1, wherein the second methacrylic copolymer (C) is a methacrylic copolymer (C1) comprising 10 to 99% by mass of methyl methacrylate units, 1 to 40% by mass of α-methylstyrene units, and 0 to 60% by mass of one or more other units (UO).

3. The molding material according to claim 2, wherein the methacrylic copolymer (C1) contains, as the other units (UO), aromatic vinyl compound units other than α-methylstyrene units.

4. The molding material according to claim 2, wherein the methacrylic copolymer (C1) contains, as the other units (UO), one or more ring structure units (UR) selected from the group consisting of acid anhydride units, imide units containing a ring structure, and lactone ring units.

5. One or more types selected from the group consisting of ABS resin, AES resin, and ASA resin, with a notched Charpy impact value of 20 kJ / m, measured according to a method in accordance with JIS K7111-1 / 1eA. ２ The molding material according to claim 1, further comprising a second styrene-based resin (D) having the above structure.

6. A lamp cover containing a first methacrylic copolymer (A) having a glass transition temperature of 100 to 121°C measured by a method in accordance with JIS K7121, and one or more resins selected from the group consisting of ABS resin, AES resin, and ASA resin having a notched Charpy impact value of 20 kJ / m ２ and a lamp housing containing a first styrene-based resin (B) having a glass transition temperature of less than 122°C.

7. A method for producing a molding material according to claim 6, comprising blending 5 to 40% by mass of the first methacrylic copolymer (A), 10 to 55% by mass of the first styrene resin (B), and 5 to 50% by mass of the second methacrylic copolymer (C).

8. A method for producing a molding material according to claim 6, wherein the second methacrylic copolymer (C) is a methacrylic copolymer (C1) comprising 10 to 99 mass% of methyl methacrylate units, 1 to 40 mass% of α-methylstyrene units, and 0 to 60 mass% of one or more other units (UO), and the other units (UO) include aromatic vinyl compound units other than α-methylstyrene units.

9. A method for producing a molding material according to claim 6, wherein the second methacrylic copolymer (C) is a methacrylic copolymer (C1) comprising 10 to 99 mass% of methyl methacrylate units, 1 to 40 mass% of α-methylstyrene units, and 0 to 60 mass% of one or more other units (UO), and the other units (UO) include one or more ring structure units (UR) selected from the group consisting of acid anhydride units, imide units having a ring structure, and lactone ring units.

10. Furthermore, the notched Charpy impact value measured by a method conforming to JIS K7111-1 / 1eA for one or more types of resin selected from the group consisting of ABS resin, AES resin, and ASA resin is 20 kJ / m ２ 7. The method for producing a molding material according to claim 6, further comprising blending a second styrene-based resin (D) having the above properties.

11. A molded body made from the molding material according to any one of claims 1 to 5.

12. A vehicle lamp comprising a lamp housing made of the molded article according to claim 11 and a lamp cover.

13. A method for producing a molding material, comprising blending a second methacrylic copolymer (C) with the pulverized material obtained by pulverizing the molded product according to claim 11.

14. A method for producing a molding material, characterized by blending a second methacrylic copolymer (C) with ground material obtained by grinding part or all of a vehicle lamp including a lamp housing made of the molded article described in claim 11.

15. A method for producing a molding material according to claim 13, further comprising blending a second styrene-based resin (D).

Images