JP2023073143A - Recycled flame-retardant styrenic resin composition and molding - Google Patents

Abstract

To provide a recycled flame-retardant styrenic resin composition that comprises a recycled, recovered styrenic resin, to achieve reduced environmental load and flame retardancy, as well as excellent thermal stability and light resistance.SOLUTION: A recycled flame-retardant styrenic resin composition comprises a recovered styrenic resin (A) and an NOR hindered amine compound (B).SELECTED DRAWING: None

Description

TECHNICAL FIELD The present invention relates to a recycled flame-retardant styrene resin composition and a molded article containing the recycled flame-retardant styrene resin composition.

Styrene-based resins are used in a wide range of applications due to their excellent moldability, dimensional stability, and impact resistance. Among them, flame-retardant polystyrene resin compositions are used in a wide range of applications, including home appliances, OA equipment, packaging containers, and heat insulating materials, and are also used for parts that require good design, such as exterior parts and transparent parts. ing.

In recent years, due to problems such as the environment and resource depletion, recycling of materials has been required, and material recycling has been promoted and material recycling is being implemented. On the other hand, due to deterioration and coloring of styrene-based resins, almost no efforts have been made to improve the quality and functionality of recycled material products.

For example, Patent Documents 1 to 3 disclose flame-retardant styrene-based resins containing NOR-type hindered amine-based compounds in styrene-based resins. Further, Patent Document 4 discloses a recycled resin composition in which a resin fluidity modifier and a phosphorus-based flame retardant are blended with a recovered styrene resin.

JP 2019-183082 A JP 2019-183084 A Japanese Patent Application Laid-Open No. 2020-83971 Japanese translation of PCT publication No. 2014-173059

However, in Patent Documents 1 to 3, although it is described that it is effective in making styrene resin thin and flame retardant, there is no case of using recycled styrene resin (or recovered styrene resin). , there is no description of the effects and characteristics of the recycled material. In addition, in Patent Document 4, although flame retardancy and fluidity are excellent, thermal stability becomes insufficient due to degraded substances and impurities contained in the recycled styrene resin, which causes problems such as molding defects and burns. be. In addition, there is a problem that degraded substances in the recycled styrene resin greatly impair the light resistance.

Therefore, the object of the present invention is to reduce the environmental load by using the recycled recovered styrene resin (A), and to have excellent flame retardancy, thermal stability, and light resistance. It is to provide a styrenic resin composition.

As a result of intensive studies to solve the above problems, the present inventors have found that the recycled flame-retardant styrene-based resin containing the recovered styrene-based resin (A) and the NOR-type hindered amine-based compound (B) reduces the environmental load. The present inventors have found that they have excellent flame retardancy, good thermal stability, and good light resistance, and have completed the present invention.

That is, the present invention is as follows.
[1] A recycled flame-retardant styrene-based resin composition containing a recovered styrene-based resin (A) and a NOR-type hindered amine-based compound (B).

[2] The content of the NOR-type hindered amine compound (B) is preferably 0.1 to 5.0 parts by mass with respect to 100 parts by mass of the recovered styrene resin (A).

[3] It is preferable that the recovered styrene resin (A) is 50% or more.

[4] It is preferable that 0.1 to 30 parts by mass of the flame retardant (C) is included with respect to 100 parts by mass of the recovered styrene resin (A).

[5] Further, it is preferable that the flame retardant (C) is a phosphorus-based flame retardant.

[6] A molded article comprising the recycled flame-retardant styrenic resin composition according to any one of [1] to [5] above.

According to the present invention, a recycled flame-retardant styrene-based resin composition that reduces environmental load by using recycled recovered styrene-based resin and has excellent flame retardancy, thermal stability, and light resistance. can be provided.

Hereinafter, embodiments of the present invention (hereinafter referred to as "present embodiments") will be described in detail. can be implemented.

[Recycled flame-retardant styrene resin composition]
The present embodiment is characterized by a recycled flame-retardant styrene resin composition containing a recovered styrene resin (A) and a NOR-type hindered amine compound (B).
This makes it possible to provide a recycled flame-retardant styrene-based resin composition that is superior in flame-retardancy, heat stability, and light resistance to the recovered styrene-based resin (A).

<Recovered styrene resin (A): component (A)>
The recycled flame-retardant styrene resin composition of the present embodiment essentially contains the recovered styrene resin (A).
In the recycled flame-retardant styrene resin composition of the present embodiment, the recovered styrene resin (A) is a pre-consumer material such as a factory-collected product, a post-consumer material such as a market-collected product, or the like. Pellets, non-standard pellets, etc. are also included. In addition, as the recovered styrene resin (A), a flame-retardant styrene resin containing a phosphorus-based flame retardant can also be used, and it may contain liquid paraffin, a stabilizer, a coloring agent, etc., and other resins may be used. Products that are laminated can also be used.
Pre-consumer materials are scraps and defective products generated in the production process of styrene resin products, as well as styrene resin products that have been discarded before shipment due to being unsold or past the quality assurance period. material. Post-consumer materials are materials that are shipped to the market once and are collected and reused after the end of consumer use. In the present invention, from the viewpoint of manufacturing products with a small environmental load and promoting green purchasing and improvement of the recycling rate, "recovered styrene resin (A)", which is a styrene recycled material in the styrene resin composition, is used. is preferably post-consumer material. Specific examples of recovered styrene resin (A) suitable as post-consumer materials include polystyrene foam, extruded sheets, containers, packaging materials, cases for recording media such as CDs and MDs, miscellaneous goods such as bobbins and hangers, and electrical equipment. and plastic parts of OA equipment.
The recovered styrene resin (A) may be mixed with unused styrene resin depending on the application. From the viewpoint of recycling, the recycled flame-retardant styrene resin composition preferably contains 50% by mass or more of the recovered styrene resin, more preferably 60% by mass or more.
In addition, the recovered styrene resin (A) includes those recovered as styrene resin from home appliances, etc. recovered under the Home Appliance Recycling Law, those recovered from resin products labeled as PS, and foamed polystyrene. Examples thereof include recovered products made of polystyrene. If necessary, a step of sorting the recovered styrene-based resin (A) from the recovered styrene-based resin (A) using known methods such as specific gravity and IR separation may be performed.

The recovered styrene-based resin (A) that can be used in the present embodiment includes a styrene-based monomer and, if necessary, another vinyl-based monomer copolymerizable with the styrene-based monomer and a rubber-like polymer. It is preferably a resin obtained by polymerizing one or more selected from coalescence (a). In other words, the recovered styrenic resin (A) is preferably a polymer having styrenic monomer units, essentially contains styrenic monomer units, and is conjugated to the styrene monomer units. A polymer (for example, a rubber-modified styrene resin and/or a styrene copolymer resin) having other polymerizable vinyl monomers and/or monomer units of the rubber-like polymer (a) as optional components It is more preferable to have Further, the recovered styrene resin (A) that can be used in the present embodiment preferably contains 70% by mass or more of styrene monomer units with respect to the entire recovered styrene resin (A). Therefore, as the recovered styrene resin (A) of the present embodiment, one or two selected from the group consisting of polymers containing styrene monomer units, rubber-modified styrene resins, and styrene copolymer resins. It is preferable to contain at least
The preferable composition form of the recovered styrene resin (A) in the present embodiment is not particularly limited, but specifically, for example, polystyrene, polystyrene polymer (polystyrene and/or polystyrene-unsaturated carboxylic acid rubber-modified styrenic resins or styrenic copolymer resins in which particles of the rubber-like polymer (a) are dispersed in a polymer matrix containing a polystyrene polymer, etc.).

<<Polystyrene>>
In the present embodiment, polystyrene that can be used as the recovered styrene-based resin (A) is a (homo)polymer obtained by polymerizing styrene-based monomers, and generally available ones can be appropriately selected and used. . Styrenic monomers constituting polystyrene include, in addition to styrene, α-methylstyrene, α-methyl-p-methylstyrene, ο-methylstyrene, m-methylstyrene, p-methylstyrene, vinyltoluene, ethyl Styrene, isobutylstyrene, and styrene derivatives such as t-butylstyrene or bromostyrene and indene. Styrene is particularly preferred from an industrial point of view. These styrenic monomers can be used singly or in combination of two or more. Polystyrene is not excluded from further containing monomer units other than the above styrene-based monomer units as long as the effects of the present invention are not impaired, but typically consists of styrene-based monomer units.

<<Rubber-modified styrene resin>>
In the present embodiment, the rubber-modified styrene resin that can be used as the recovered styrene resin (A) is obtained by dispersing particles of the rubber-like polymer (a) in a styrene resin as a matrix. It can be produced by polymerizing a styrenic monomer in the presence of the polymer (a).

Examples of styrene-based monomers constituting the rubber-modified styrene-based resin of the present embodiment include styrene, α-methylstyrene, α-methyl p-methylstyrene, ο-methylstyrene, m-methylstyrene, Styrene derivatives such as p-methylstyrene, vinyltoluene, ethylstyrene, isobutylstyrene, and t-butylstyrene or bromostyrene and indene. Styrene is particularly preferred. These styrenic monomers can be used singly or in combination of two or more.

The rubber-like polymer (a) contained in the rubber-modified styrenic resin of the present embodiment is, for example, a styrene monomer unit obtained from the above styrene-based monomer inside the rubber-like polymer (a). The containing resin may be included, and/or the surface of the rubber-like polymer (a) may be grafted with a resin containing styrene monomer units.

As the rubber-like polymer (a), for example, rubber components such as polybutadiene, polyisoprene, natural rubber, polychloroprene, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer can be used. Further, the rubber component may include a form encapsulating polystyrene and/or polystyrene-unsaturated carboxylic acid polymer. Among them, the rubber-like polymer (a) is preferably polybutadiene or a styrene-butadiene copolymer. Both high cis polybutadiene with a high cis content and low cis polybutadiene with a low cis content can be used for the polybutadiene. Both a random structure and a block structure can be used as the structure of the styrene-butadiene copolymer. One or more of these rubber-like polymers (a) can be used. Saturated rubber obtained by hydrogenating butadiene rubber can also be used.

Examples of such rubber-modified styrene resins include HIPS (high impact polystyrene), ABS resin (acrylonitrile-butadiene-styrene copolymer), AAS resin (acrylonitrile-acrylic rubber-styrene copolymer), AES resin ( acrylonitrile-ethylene propylene rubber-styrene copolymer) and the like.

When the rubber-modified styrene-based resin is a HIPS-based resin, among these rubber-like polymers (a), particularly preferred is a high-cis polybutadiene composed of 90 mol % or more of cis-1,4 bonds. In the high-cis polybutadiene, the vinyl 1,2 bond is preferably 6 mol % or less, particularly preferably 3 mol % or less.

The content of isomers having a cis-1,4 structure, trans-1,4 structure, or vinyl-1,2 structure as isomers related to the constituent units of the above isis polybutadiene was measured using an infrared spectrophotometer. , can be calculated by data processing using the Morello method.

The high-cis polybutadiene can be easily obtained by a known production method, for example, by polymerizing 1,3-butadiene using a catalyst containing an organoaluminum compound and a cobalt or nickel compound.

The content of the rubber-like polymer (a) contained in the rubber-modified styrenic resin is preferably 3 to 20% by mass, more preferably 5 to 15% by mass, with respect to 100% by mass of the rubber-modified styrenic resin. %. If the content of the rubber-like polymer (a) is less than 3% by mass, the impact resistance of the styrene-based resin may deteriorate. Moreover, when the content of the rubber-like polymer (a) exceeds 20% by mass, the flame retardancy may be lowered.

In the present disclosure, the content of the rubber-like polymer (a) contained in the rubber-modified styrenic resin is a value calculated using pyrolysis gas chromatography.

The average particle size of the rubber-like polymer (a) contained in the rubber-modified styrenic resin is preferably 0.5 to 4.0 μm, more preferably 0, from the viewpoint of impact resistance and flame retardancy. 0.8 to 3.5 μm.

In the present disclosure, the average particle size of the rubber-like polymer (a) contained in the rubber-modified styrenic resin can be measured by the following method.
A 75 nm-thick ultra-thin section is prepared from a rubber-modified styrenic resin stained with osmium tetroxide, and photographed at a magnification of 10,000 using an electron microscope. In the photograph, particles dyed black are rubber-like polymer (a). From the picture, the following formula (N1):
Average particle size = ΣniDri ³ /ΣniDri ² (N1)
(In the above formula (N1), ni is the number of rubber-like polymer (a) particles having a particle diameter Dri, and the particle diameter Dri is a particle diameter calculated as an equivalent circle diameter from the area of the particles in the photograph. .)
The area-average particle size is calculated by the method and taken as the average particle size of the rubber-like polymer (a). For this measurement, a photograph is loaded into a scanner at a resolution of 200 dpi and measured using particle analysis software of an image analyzer IP-1000 (manufactured by Asahi Kasei Corporation).

The reduced viscosity of the rubber-modified styrenic resin (which is an index of the molecular weight of the rubber-modified styrenic resin) is preferably in the range of 0.50 to 0.85 dL/g, more preferably 0.55 to 0.85 dL/g. It is in the range of 0.80 dL/g. If it is less than 0.50 dL/g, the impact strength may decrease, and if it exceeds 0.85 dL/g, the fluidity may decrease, resulting in a decrease in moldability.

In the present disclosure, the reduced viscosity of the rubber-modified styrenic resin is a value measured in a toluene solution at 30° C. and a concentration of 0.5 g/dL.

The method for producing the rubber-modified styrenic resin is not particularly limited, but bulk polymerization (or solution polymerization) in which a styrenic monomer (and a solvent) is polymerized in the presence of the rubber-like polymer (a), Alternatively, it can be produced by bulk-suspension polymerization that shifts to suspension polymerization during the reaction, or emulsion graft polymerization that polymerizes a styrenic monomer in the presence of the rubber-like polymer (a) latex. In bulk polymerization, a mixed solution containing a rubber-like polymer (a), a styrenic monomer, and optionally an organic solvent, an organic peroxide, and/or a chain transfer agent is added to a complete mixing reactor. Alternatively, it can be produced by continuously supplying to a polymerization apparatus constructed by connecting a tank reactor and a plurality of tank reactors in series.

<<Styrene-based copolymer resin>>
In the present embodiment, the styrene copolymer resin that can be used as the recovered styrene resin (A) includes styrene monomer units and other monomers copolymerizable with the styrene monomer (for example, It is a resin containing unsaturated carboxylic acid-based monomer units). For example, when the other monomer is an unsaturated carboxylic acid-based monomer unit, the styrene-based copolymer resin according to the present invention is a total of styrene-based monomer units and unsaturated carboxylic acid-based monomer units. When the content is 100% by mass, the content of styrene monomer units is preferably 69 to 98% by mass, more preferably 74 to 96% by mass, and still more preferably 77 to 92% by mass. is in the range of By setting the content to 69% by mass or more, the fluidity of the resin can be improved. On the other hand, by setting the content of the styrene-based monomer unit to 98% by mass or less, it becomes difficult to allow a desired amount of the unsaturated carboxylic acid-based monomer unit described later, which is an example of other monomers, to be present. It becomes difficult to obtain the effect described later by the monomer unit of.

The unsaturated carboxylic acid-based monomer in the present embodiment includes one or more selected from the group consisting of unsaturated carboxylic acid monomers and unsaturated carboxylic acid ester monomers.

In the preferred styrenic copolymer resin of the present embodiment, the unsaturated carboxylic acid monomer unit plays a role of improving heat resistance. When the total content of styrene-based monomer units, unsaturated carboxylic acid monomer units, and unsaturated carboxylic acid ester monomer units in the styrene-based copolymer resin is 100% by mass, unsaturated carboxylic acid The content of monomer units is preferably 2 to 16% by mass, more preferably 4 to 14% by mass, still more preferably 8 to 13% by mass. By setting the content to 2% by mass or more, the dispersibility of the component (B) is improved and the heat resistance can be further improved. On the other hand, by setting the content to 16% by mass or less, when the recycled flame-retardant styrene-based resin composition of the present embodiment is used as a masterbatch, excellent dispersibility in the styrene-based resin is exhibited, and flame retardancy is achieved. In addition to improving the properties, molding appearance, resin fluidity, and mechanical properties are further improved.

In general, styrene-methacrylic acid resins including styrene-methacrylic acid-methyl methacrylate copolymer resin, which is one form of the styrene copolymer resin in the present invention, are produced by radical polymerization in most cases on an industrial scale. ing. However, in the present embodiment, in order to suppress the gelation reaction in the devolatilization step, various alcohols can be added to the polymerization system for polymerization.

The unsaturated carboxylic acid ester monomer suppresses the dehydration reaction of the unsaturated carboxylic acid monomer through intermolecular interaction with the unsaturated carboxylic acid monomer, and improves the mechanical strength of the resin. can be used for Furthermore, the unsaturated carboxylic acid ester monomer contributes to the improvement of resin properties such as weather resistance and surface hardness.

In the present embodiment, when the total content of the styrene-based monomer unit, the unsaturated carboxylic acid monomer unit, and the unsaturated carboxylic acid ester monomer unit is 100% by mass, the unsaturated carboxylic acid ester monomer The body unit content is preferably 0 to 15% by mass, more preferably 1 to 12% by mass, still more preferably 2 to 10% by mass. By setting the content to 15% by mass or less, the fluidity of the resin can be improved and the water absorption can be suppressed. In addition, by setting the lower limit of the content of the unsaturated carboxylic acid ester monomer unit to 0% by mass, heat resistance can be improved and cost can be reduced. The body unit content can also be greater than 0% by mass.

When the unsaturated carboxylic acid monomer and the unsaturated carboxylic acid ester monomer unit are bonded side by side, if a high-temperature, high-vacuum devolatilization device is used, a dealcoholization reaction may occur depending on the conditions, resulting in a six-membered Cyclic anhydrides may be formed. The styrenic copolymer resin of the present embodiment may contain this six-membered cyclic anhydride, but it is preferable that the amount of the six-membered cyclic anhydride produced is as small as possible because it reduces fluidity.

In the present embodiment, styrene monomer units (e.g., styrene monomer units), unsaturated carboxylic acid monomer units (e.g., methacrylic acid monomer units) and unsaturated The content of carboxylic acid ester monomeric units (eg, methyl methacrylate monomeric units) can be determined from the integral ratio of spectra measured with a proton nuclear magnetic resonance ( ¹ H-NMR) spectrometer.

In the present embodiment, the styrene copolymer resin includes styrene monomer units, unsaturated carboxylic acid monomers (e.g., unsaturated carboxylic acid monomer units and unsaturated It is not excluded that a monomer unit other than the saturated carboxylic acid ester monomer unit) is further contained within a range that does not impair the effects of the present invention. However, the styrenic copolymer resin in the present invention is typically composed of styrenic monomer units, unsaturated carboxylic acid monomer units, and/or unsaturated carboxylic acid ester monomer units. is preferred.

Examples of the styrene-based monomer constituting the styrene-based copolymer resin of the present embodiment include, but are not limited to, styrene, α-methylstyrene, α-methyl-p-methylstyrene, Styrene derivatives such as ο-methylstyrene, m-methylstyrene, p-methylstyrene, vinyltoluene, ethylstyrene, isobutylstyrene, t-butylstyrene, bromostyrene, and indene. As the styrene-based monomer, styrene is preferable from an industrial point of view. These styrenic monomers can be used singly or in combination of two or more.

The unsaturated carboxylic acid monomer constituting the styrenic copolymer resin of the present embodiment is not particularly limited, but examples thereof include methacrylic acid, acrylic acid, maleic anhydride, maleic acid, fumaric acid, and itaconic acid. . As the unsaturated carboxylic acid monomer, methacrylic acid is preferable because it has a large effect of improving heat resistance, is liquid at room temperature and is excellent in handleability. These unsaturated carboxylic acid-based monomers can be used singly or in combination of two or more.

The unsaturated carboxylic acid ester-based monomer that constitutes the styrene-based copolymer resin of the present embodiment is not particularly limited, but examples thereof include methyl (meth)acrylate, ethyl (meth)acrylate, and (meth)acrylic acid. propyl, butyl (meth)acrylate, cyclohexyl (meth)acrylate and the like. As the (meth)acrylic acid ester monomer, methyl (meth)acrylate is preferable because it has little effect on deterioration of heat resistance. These unsaturated carboxylic acid ester monomers can be used singly or in combination of two or more.

Styrene-based copolymer resins suitable for the present embodiment include styrene-methacrylic acid copolymer, styrene-methyl methacrylate copolymer, styrene-methacrylic acid-methyl methacrylate copolymer, and styrene-acrylic acid copolymer. , styrene-methyl acrylate copolymer, styrene-acrylic acid-methyl acrylate copolymer, styrene-methyl methacrylate-butyl methacrylate copolymer, styrene-butyl methacrylate copolymer, or styrene-maleic anhydride A copolymer etc. are mentioned.

In the present embodiment, the weight average molecular weight (Mw) of the styrenic copolymer resin is preferably 100,000 to 350,000, more preferably 120,000 to 300,000, still more preferably 140,000 to 240. , 000. When the weight-average molecular weight (Mw) is from 100,000 to 350,000, a resin having excellent balance between mechanical strength and fluidity can be obtained, and gel matter is less mixed. The weight average molecular weight (Mw) is a value obtained by standard polystyrene conversion using gel permeation chromatography.

In the present embodiment, the method for polymerizing the styrene-based alkoxy group-polymerized resin is not particularly limited, but for example, a bulk polymerization method or a solution polymerization method can be suitably employed as a radical polymerization method. The polymerization method mainly includes a polymerization step of polymerizing raw materials for polymerization (monomer components) and a devolatilization step of removing volatile matter such as unreacted monomers and polymerization solvent from the polymerization product.

An example of a method for polymerizing a styrene-based copolymer resin that can be used in the present embodiment will be described below.

When polymerizing raw materials to obtain a styrenic copolymer resin, the raw material composition for polymerization typically contains a polymerization initiator and a chain transfer agent.

Polymerization initiators used for polymerization of styrene copolymer resins include organic peroxides such as 2,2-bis(t-butylperoxy)butane, 1,1-bis(t-butylperoxy)cyclohexane, n -Peroxyketals such as butyl-4,4-bis(t-butylperoxy)valerate, dialkyl peroxides such as di-t-butyl peroxide, t-butylcumyl peroxide, dicumyl peroxide, acetyl peroxide, isobutyryl Examples include diacyl peroxides such as peroxides, peroxydicarbonates such as diisopropylperoxydicarbonate, peroxyesters such as t-butylperoxyacetate, ketone peroxides such as acetylacetone peroxide, and hydroperoxides such as t-butyl hydroperoxide. be able to. Among them, 1,1-bis(t-butylperoxy)cyclohexane is preferred from the viewpoint of decomposition rate and polymerization rate.

Chain transfer agents used for polymerization of styrene copolymer resins include, for example, α-methylstyrene linear dimer, n-dodecylmercaptan, t-dodecylmercaptan, n-octylmercaptan and the like.

As a method for polymerizing the styrene-based copolymer resin, solution polymerization using a polymerization solvent can be employed as necessary. Examples of the polymerization solvent to be used include aromatic hydrocarbons such as ethylbenzene and dialkyl ketones such as methyl ethyl ketone, each of which may be used alone or in combination of two or more. Other polymerization solvents such as aliphatic hydrocarbons can be further mixed with the aromatic hydrocarbons as long as they do not reduce the solubility of the polymerization product. These polymerization solvents are preferably used in an amount not exceeding 25 parts by mass with respect to 100 parts by mass of the total monomers. If the amount of the polymerization solvent exceeds 25 parts by mass with respect to 100 parts by mass of the total monomers, the polymerization rate tends to decrease significantly and the mechanical strength of the resulting resin tends to decrease significantly. Addition of 5 to 20 parts by mass per 100 parts by mass of all monomers prior to polymerization facilitates homogenization of quality and is also preferable from the viewpoint of polymerization temperature control.

In the present embodiment, the apparatus used in the polymerization step for obtaining the styrene-based copolymer resin is not particularly limited, and may be appropriately selected according to the polymerization method of the styrene-based resin. For example, when bulk polymerization is employed, a polymerization apparatus in which one or a plurality of complete mixing reactors are connected can be used. Also, the devolatilization step is not particularly limited. When bulk polymerization is adopted, the unreacted monomer is preferably 50% by mass or less, more preferably 40% by mass or less. It is devolatilized by a known method. More specifically, for example, a flash drum, a twin-screw devolatilizer, a thin-film evaporator, an extruder, or other ordinary devolatilizer can be used, but a devolatilizer with a small stagnant portion is preferred. The temperature of the devolatilization treatment is usually about 190 to 280° C., and the mixture of the unsaturated carboxylic acid monomer (eg, methacrylic acid) and the unsaturated carboxylic acid ester monomer (eg, methyl methacrylate) is 190 to 260° C. is more preferable from the viewpoint of suppressing the formation of a six-membered cyclic acid anhydride due to adjacency. The pressure of the devolatilization treatment is usually about 0.13 to 4.0 kPa, preferably 0.13 to 3.0 kPa, more preferably 0.13 to 2.0 kPa. Desirable devolatilization methods include, for example, a method of reducing the pressure under heating to remove the volatile matter, and a method of removing the volatile matter through an extruder or the like designed for the purpose of removing the volatile matter.

<NOR Hindered Amine Compound (B): Component (B)>
The recycled flame-retardant styrene-based resin composition of the present embodiment essentially contains the NOR-type hindered amine-based compound (B).
The content of the NOR-type hindered amine compound (B) is 0.1 to 5% by mass, preferably 0.3 to 3% by mass, more preferably 0% with respect to 100% by mass of component (A). .5 to 2.0% by mass. If it is 0.1% by mass or more, it is possible to improve the flame retardancy, thermal stability and color of the recovered styrene resin. The component (B) may be added as it is as an additive, but the component already contained in the recovered styrene resin (A) can also be used as the NOR-type hindered amine compound (B) of the present embodiment. In addition, post-consumer materials in which the NOR hindered amine compound (B) is already contained in the recovered material can also be used as the NOR hindered amine compound (B) of the present embodiment. In that case, it is not necessary to add component (B) or other styrenic resin (for example, recovered styrenic resin (A) or unused styrenic resin) in order to make the content of component (B) predetermined. .

In addition, the component (B) can improve the thermal stability by stabilizing the radical decomposition product from the recovered styrene resin (A). It also has the effect of inactivating impurities and suppressing photo-oxidative degradation. Furthermore, when it is used in combination with a flame retardant, the synergistic effect of flame retardancy makes it possible to achieve flame retardancy with a small amount. In particular, when used in combination with a phosphorus-based flame retardant, thermal stability and hue can be improved. On the other hand, in the case of N-methyl hindered amine compounds or NH hindered amine compounds, such an effect is not observed.

The NOR-type hindered amine compound (B) used in this embodiment is not particularly limited as long as it has a structure of an N-alkoxyl group (>N-OR). Specific examples include, for example, NOR-type hindered amine compounds described in JP-A-2002-507238, WO 2005/082852, WO 2008/003605, and the like.

Further, the NOR-type hindered amine compound (B) is particularly preferably of polymer type. Macromolecular types are generally oligomeric or polymeric compounds. If it is a polymer type, mold deposits during molding can be reduced, and it is excellent in terms of flame retardancy and heat resistance.

The number of repeating units of the oligomeric or polymeric NOR-type hindered amine compound (B) is preferably 2-100, more preferably 5-80.

Specific examples of the NOR-type hindered amine compound (B) include the following compounds: 1-cyclohexyloxy-2,2,6,6-tetramethyl-4-octadecylaminopiperidine; -tetramethyl-4-piperidyl) sebacate; 2,4-bis[(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl)butylamino]-6-(2-hydroxyethylamino )-s-triazine; bis(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl)adipate; 4,4′-hexamethylenebis(amino-2,2,6,6- tetramethylpiperidine) and 2,4-dichloro-6-[(1-octyloxy-2,2,6,6) end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine -tetramethylpiperidin-4-yl)butylamino]-oligomeric compound which is the condensation product with s-triazine; 4,4'-hexamethylenebis(amino-2,2,6,6-tetramethylpiperidine) and 2,4-dichloro-6-[(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidine end-capped with 2-chloro-4,6-bis(dibutylamino)-s-triazine 2,4-bis[(1-cyclohexyloxy-2,2,6,6-piperidin-4-yl), an oligomeric compound that is a condensation product with -4-yl)butylamino]-s-triazine; -6-chloro-s-triazine; peroxide-treated 4-butylamino-2,2,6,6-tetramethylpiperidine, 2,4,6-trichloro-s-triazine, cyclohexane, and N,N Reaction product with '-ethane-1,2-diylbis(1,3-propanediamine) (N,N',N'''-tris{2,4-bis[(1-cyclohexyloxy-2,2 ,6,6-tetramethylpiperidin-4-yl)n-butylamino]-s-triazin-6-yl}-3,3′-ethylenediiminodipropylamine); bis(1-undecanoxy-2,2 ,6,6-tetramethylpiperidin-4-yl)carbonate; 1-undecyloxy-2,2,6,6-tetramethylpiperidin-4-one; bis(1-stearyloxy-2,2,6, 6-Tetramethylpiperidin-4-yl)carbonate.

The NOR-type hindered amine compound (B) of the present embodiment may be a commercially available product, for example Flamestab NOR116FF, TINUVIN NOR371, TINUVIN XT850FF, TINUVIN XT855FF, TINUVIN PA123 manufactured by BASF, LA-77Y, LA-81, FP manufactured by ADEKA Corporation. -T80 and the like can be exemplified.
The NOR-type hindered amine compound (B) in this embodiment may be used alone or in combination of two or more.

<Flame retardant (C): component (C)>
In this embodiment, the recycled flame-retardant styrene resin composition or the recovered styrene resin (A) may contain a flame retardant (C). The content of the flame retardant (C) is preferably 0.1 to 30% by mass, more preferably 2 to 20% by mass, relative to the entire recycled flame-retardant styrene resin composition (100% by mass). More preferably, it is 3 to 15% by mass. If the content is more than 30% by mass, the impact resistance is lowered. Preferable flame retardants are phosphorus-based flame retardants and/or bromine-based flame retardants that are expected to have a synergistic flame retardant effect with the NOR-type hindered amine compound (B). Furthermore, when used in combination with a phosphorus-based flame retardant, thermal stability, hue, and light resistance can be improved. In particular, when the phosphorus-based flame retardant is a phosphonate ester compound and/or a phosphinic acid compound, the hue improving effect is large. The component (C) may be added as an additive as it is, but it can also be used after being contained in the recovered styrenic resin.

-Phosphorus Flame Retardant-
The phosphorus-based flame retardant is not particularly limited, and one obtained by a conventionally known method or a commercially available product can be used. Preferred are phosphate ester compounds, phosphazene compounds, phosphonate compounds (including, for example, phosphonate ester compounds), or phosphinic acid compounds (including, for example, phosphinate compounds), either alone or You may use it in combination of 2 or more types. Among them, phosphoric acid ester compounds, phosphonic acid ester compounds, and phosphinic acid compounds, which have good compatibility with styrenic resins, are most preferred.

When the phosphorous flame retardant has a phosphorus content of 3.0% by mass or more, a synergistic effect of flame retardancy with the NOR-type hindered amine compound (B) is exhibited, and high flame retardancy is achieved with a small addition amount. You can get sex. A phosphorus content of 3.0% by mass or more means a phosphorus compound containing 3.0% by mass or more of elemental phosphorus in the phosphorus-based flame retardant.
The phosphorus content of the phosphorus-based flame retardant is preferably 3.0% by mass or more, more preferably 7.0% by mass or more and 30% by mass or less, based on the total amount of the phosphorus-based flame retardant. When the phosphorus content is 3.0% by mass or more, a synergistic effect is exhibited with the NOR-type hindered amine compound (B) for flame retardancy, and flame retardancy can be obtained with a small addition amount. It is effective for low dielectric loss tangent and can reduce changes in usage environment.
As for the phosphorus content, the content of phosphorus atoms contained in the phosphorus-based flame retardant can be measured by an absorption photometry method.

As the phosphorus-based flame retardant, a flame retardant that is liquid at 150° C. to 300° C. and has a melting point of 300° C. or less is preferable because it is well dispersed in the regenerated flame-retardant styrene resin composition. When a phosphorus-based flame retardant that is solid during melt-kneading (for example, a phosphorus-based flame retardant that does not have a melting point) is used, the phosphorus-based flame retardant is not liquid during melt-kneading, so it is uniformly dispersed in component (A). Otherwise, physical properties may deteriorate, and flame retardancy may deteriorate.

--Phosphate compound--
As the phosphate ester compound, an aromatic phosphate ester compound is preferred. Monomeric phosphoric acids such as, for example, trimethyl phosphate (TMP), triethyl phosphate (TEP), triphenyl phosphate (TPP), tricresyl phosphate (TCP), trixylenyl phosphate (TXP), cresyl diphenyl phosphate (CDP) Ester compounds, resorcinol bis-dixylenyl phosphate, resorcinol bis-diphenyl phosphate, bisphenol A bis-diphenyl phosphate (BADP), bisphenol A bis-dicresyl phosphate, biphenol bis-diphenyl phosphate, biphenol bis-dixylenyl phosphate, etc. and an aromatic condensed phosphate compound which is a reaction product of phosphorus oxychloride, a dihydric phenol compound and phenol (or alkylphenol).
Among these, triphenyl phosphate (TPP), tricresyl phosphate (TCP), resorcinol bis-dixylenyl phosphate, resorcinol bis-diphenyl phosphate, bisphenol A bis-diphenyl phosphate (BADP), and biphenol bis-diphenyl phosphate are preferred. , biphenol bis-dixylenyl phosphate, more preferably triphenyl phosphate (TPP), resorcinol bis-dixylenyl phosphate, resorcinol bis-diphenyl phosphate, still more preferably resorcinol bis-dixylenyl phosphate. be.

（上記化学式（１）中、Ｒ^１～Ｒ^５はそれぞれ独立して、水素原子、炭素数１～１０のアルキル基、炭素数３～２０のシクロアルキル基、炭素数６～２０のアリール基、炭素数１～１０のアルコキシ基、又はハロゲン原子であり、Ｒ^１～Ｒ^５は同一でも異なっていてもよい。ｎは０～３０の整数であり、好ましくは０～１０の整数である。）
上記アルキル基としては、メチル基、エチル基、プロピル基、イソプロピル基、ブチル基、イソブチル基、第２ブチル基、第３ブチル基、アミル基、第３アミル基、ヘキシル基、２－エチルヘキシル基、ｎ－オクチル基、ノニル基、デシル基等が挙げられる。
上記シクロアルキル基としてはシクロヘキシル基等が挙げられる。
上記アリール基としては、フェニル基、クレジル基、キシリル基、２，６－キシリル基、２，４，６－トリメチルフェニル基、ブチルフェニル基、ノニルフェニル基等が挙げられる。
上記アルコキシ基としては、メトキシ基、エトキシ基、プロポキシ基、ブトキシ基等が挙げられる。
上記ハロゲン原子としては、フッ素原子、塩素原子、臭素原子等が挙げられる。 In addition, the phosphate ester compound is preferably a condensed phosphate compound, which is a condensation type, from the viewpoint of heat resistance, reduction of mold deposits during molding, etc., and is particularly represented by the following chemical formula (1). An aromatic condensed phosphate compound is preferred.

(In the above chemical formula (1), R ¹ to R ⁵ are each independently a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an alkoxy group having 1 to 10 carbon atoms or a halogen atom, R ¹ to R ⁵ may be the same or different, n is an integer of 0 to 30, preferably 0 to 10.)
Examples of the alkyl group include methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, tertiary butyl group, tertiary butyl group, amyl group, tertiary amyl group, hexyl group, 2-ethylhexyl group, n-octyl group, nonyl group, decyl group and the like.
A cyclohexyl group etc. are mentioned as said cycloalkyl group.
Examples of the aryl group include phenyl group, cresyl group, xylyl group, 2,6-xylyl group, 2,4,6-trimethylphenyl group, butylphenyl group and nonylphenyl group.
Examples of the alkoxy group include a methoxy group, an ethoxy group, a propoxy group, and a butoxy group.
Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and the like.

Furthermore, among the above phosphate ester compounds, from the viewpoint of compatibility between flame retardancy and transparency, a phosphate ester compound represented by the following compound (1-1), (1-2), or (1-3) is preferred, compound (1-2) or (1-3) is more preferred, and compound (1-2) is even more preferred.
As the compound (1-2) (resorcinol bis-dixylenyl phosphate), for example, PX-200 manufactured by Daihachi Chemical Industry Co., Ltd. can be used, and as the compound (1-3) (resorcinol bis-diphenyl phosphate), , for example, CR-733S manufactured by Daihachi Chemical Industry Co., Ltd. can be used.

-Phosphazene compound-
Examples of phosphazene compounds include 1,1,3,3,5,5-hexa(methoxy)cyclotriphosphazene, 1,1,3,3,5,5-hexa(ethoxy)cyclotriphosphazene, 1,1 ,3,3,5,5-hexa(n-propoxy)cyclotriphosphazene, 1,1,3,3,5,5-hexa(iso-propoxy)cyclotriphosphazene, 1,1,3,3,5 ,5-hexa(n-butoxy)cyclotriphosphazene, 1,1,3,3,5,5-hexa(iso-butoxy)cyclotriphosphazene, 1,1,3,3,5,5-hexa(phenoxy) ) cyclotriphosphazene, 1,1,3,3,5,5-hexa(p-tolyloxy)cyclotriphosphazene, 1,1,3,3,5,5-hexa(m-tolyloxy)cyclotriphosphazene, 1 , 1,3,3,5,5-hexa(o-tolyloxy)cyclotriphosphazene, 1,1,3,3,5,5-hexa(4-ethylphenoxy)cyclotriphosphazene, 1,1,3, 3,5,5-hexa(4-n-propylphenoxy)cyclotriphosphazene, 1,1,3,3,5,5-hexa(4-iso-propylphenoxy)cyclotriphosphazene, 1,1,3, 3,5,5-hexa(4-t-butylphenoxy)cyclotriphosphazene, 1,1,3,3,5,5-hexa(4-t-octylphenoxy)cyclotriphosphazene, 1,1,3, 3,5,5-hexa(2,3-dimethylphenoxy)cyclotriphosphazene, 1,1,3,3,5,5-hexa(2,4-dimethylphenoxy)cyclotriphosphazene, 1,1,3, 3,5,5-hexa(2,5-dimethylphenoxy)cyclotriphosphazene, 1,1,3,3,5,5-hexa(2,6-dimethylphenoxy)cyclotriphosphazene, 1,3,5- Tris(methoxy)-1,3,5-tris(phenoxy)cyclotriphosphazene, 1,3,5-tris(ethoxy)-1,3,5-tris(phenoxy)cyclotriphosphazene, 1,3,5- tris(n-propoxy)-1,3,5-tris(phenoxy)cyclotriphosphazene, 1,3,5-tris(iso-propoxy)-1,3,5-tris(phenoxy)cyclotriphosphazene, 1, 3,5-tris(n-butoxy)-1,3,5-tris(phenoxy)cyclotriphosphazene, 1,3,5-tris(iso-butoxy)-1,3,5-tris(phenoxy)cyclotris Phosphazene, 1,3,5-tris(methoxy)-1,3,5-tris(p-tolyloxy)cyclotriphosphazene, 1,3,5-tris(methoxy)-1,3,5-tris(m- tolyloxy)cyclotriphosphazene, 1,3,5-tris(methoxy)-1,3,5-tris(o-tolyloxy)cyclotriphosphazene, 1,3,5-tris(ethoxy)-1,3,5- tris(p-tolyloxy)cyclotriphosphazene, 1,3,5-tris(ethoxy)-1,3,5-tris(m-tolyloxy)cyclotriphosphazene, 1,3,5-tris(ethoxy)-1, 3,5-tris(o-tolyloxy)cyclotriphosphazene, 1,3,5-tris(n-propoxy)-1,3,5-tris(p-tolyloxy)cyclotriphosphazene, 1,3,5-tris (n-propoxy)-1,3,5-tris(m-tolyloxy)cyclotriphosphazene, 1,3,5-tris(n-propoxy)-1,3,5-tris(o-tolyloxy)cyclotriphosphazene , 1,3,5-tris(iso-propoxy)-1,3,5-tris(p-tolyloxy)cyclotriphosphazene, 1,3,5-tris(n-butoxy)-1,3,5-tris (p-tolyloxy)cyclotriphosphazene, 1,3,5-tris(iso-butoxy)-1,3,5-tris(p-tolyloxy)cyclotriphosphazene, 1,3,5-tris(methoxy)-1 , 3,5-tris(4-t-butylphenoxy)cyclotriphosphazene, 1,3,5-tris(methoxy)-1,3,5-tris(4-t-octylphenoxy)cyclotriphosphazene, 1, 3,5-tris(n-propoxy)-1,3,5-tris(4-t-butylphenoxy)cyclotriphosphazene, 1,3,5-tris(n-propoxy)-1,3,5-tris (4-t-octylphenoxy)cyclotriphosphazene and the like.

Among these, preferably 1,1,3,3,5,5-hexa(methoxy)cyclotriphosphazene, 1,1,3,3,5,5-hexa(ethoxy)cyclotriphosphazene, 1,1,3 , 3,5,5-hexa(phenoxy)cyclotriphosphazene, 1,1,3,3,5,5-hexa(p-tolyloxy)cyclotriphosphazene, 1,3,5-tris(methoxy)-1, 3,5-tris(phenoxy)cyclotriphosphazene, 1,3,5-tris(ethoxy)-1,3,5-tris(phenoxy)cyclotriphosphazene, more preferably 1,1,3,3 ,5,5-hexa(ethoxy)cyclotriphosphazene, 1,1,3,3,5,5-hexa(phenoxy)cyclotriphosphazene, 1,3,5-tris(ethoxy)-1,3,5- Tris(phenoxy)cyclotriphosphazene, more preferably 1,1,3,3,5,5-hexa(phenoxy)cyclotriphosphazene.

（上記化学式（２）中、Ｒ^６～Ｒ^１０は、それぞれ独立して、水素原子、又は置換基を有していてもよい一価の炭化水素基であり、Ｒ^６～Ｒ^１０はそれぞれ同一でも異なっていてもよい。
本明細書中において、一価の炭化水素基としては、鎖状（直鎖及び分岐鎖のいずれでもよい）及び環状（単環、縮合多環、架橋環及びスピロ環のいずれでもよい）のいずれであってもよく、例えば、側鎖を有する環状炭化水素基が挙げられる。また、炭化水素基は、飽和及び不飽和のいずれでもよい。
当該炭化水素基としては、例えば、アルキル基、シクロアルキル基、アリル基、アリール基、アルキルアリール基、アリールアルキル基等が挙げられる。 -Phosphonic acid ester-
Phosphonate esters include, for example, those represented by the following chemical formula (2).

(In the above chemical formula (2), R ⁶ to R ¹⁰ are each independently a hydrogen atom or a monovalent hydrocarbon group which may have a substituent, and R ⁶ to R ¹⁰ are each the same but can be different.
In the present specification, the monovalent hydrocarbon group includes both chain (both linear and branched) and cyclic (both monocyclic, condensed polycyclic, bridged and spirocyclic) groups. and may include, for example, a cyclic hydrocarbon group having a side chain. Also, the hydrocarbon group may be either saturated or unsaturated.
Examples of the hydrocarbon group include alkyl groups, cycloalkyl groups, allyl groups, aryl groups, alkylaryl groups, and arylalkyl groups.

Specific examples of the phosphonate represented by the above chemical formula (2) include compounds represented by the following formulas (2-1) to (2-8).

-Phosphinic acid compound-
Phosphinic acid compounds include, for example, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and 10-benzyl-9,10-dihydro-9-oxa-10-phosphaphenanthrene- 10-oxide and the like. Examples of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide include HCA manufactured by Sanko Co., Ltd., 10-benzyl-9,10-dihydro-9-oxa-10- As phosphaphenanthrene-10-oxide, for example, BCA manufactured by Sanko Co., Ltd. can be used.

［上記式（ｉ）中、Ｒ^ｉ１及びＲ^ｉ２は、各々独立して、無置換又は１以上の水素原子が置換基Ｒ^ｉ３により置換されてもよい、直鎖状若しくは分岐状の炭素原子数１～６のアルキル基、炭素原子数６～１０のアリール基又は炭素原子数６～１４のアラルキル基であり、
前記置換基Ｒ^ｉ３は、下記式（ｉｉ）：

「上記式（ｉｉ）中、Ｒ^ｉｉ１は、各々独立して、直鎖状若しくは分岐状の炭素原子数１～６のアルキル基又は炭素原子数６～１０のアリール基であり、＊は他の原子との結合を表す。」で表され、
Ｍ^ｉは、カルシウムイオン、マグネシウムイオン、アルミニウムイオン、亜鉛イオン、ビスマスイオン、マンガンイオン、ナトリウムイオン、カリウムイオン及びプロトン化された窒素塩基からなる群より選ばれる少なくとも１種であり、ｐ^＋はＭ^ｉのイオン価を表し、１～３の正の整数であり、ｍ^ｉ１は、１～３の正の整数であり、ｎ^－は、－１、－２又は－３の負の整数を表し、ｒは、１～３の正の整数であり、｜ｐ^＋×ｒ｜＝｜ｎ^－×ｍ^ｉ１｜である。また、Ｒ^ｉ１及びＲ^ｉｉ１がそれぞれ複数存在する場合は、それぞれのＲ^ｉ１及びＲ^ｉｉ１が同一であってもあるいは異なっていてもよい。］
そのため、本実施形態におけるホスフィン酸塩化合物としては、一般式（ｉ）で表されるホスフィン酸塩類以外の公知の難燃剤を、当該ホスフィン酸塩化合物全体（１００質量％）に対して３０質量％以下含んでもよい。
上記式（ｉ）中、Ｍ^ｉのイオン価を表す「ｐ^＋」と「ｒ」との積の絶対値が、「ｎ^－」と「ｍ^ｉ１」との積の絶対値に等しい。
上記（ｉ）中、ｐ^＋は、１又は２が好ましい。ｍ^ｉ１は、１又は２が好ましい。ｎ^－は、－１又は－２が好ましい。ｒは、１又は２が好ましい -Phosphinate compound-
Moreover, in the present embodiment, the content of the phosphinate compound is preferably 70% by mass or more with respect to 100% by mass of the total amount of the flame retardant (C). Therefore, with respect to 100% by mass of the total amount of the flame retardant (C), a known flame retardant other than a phosphinate compound and / or an optional additive component (antioxidant, ultraviolet inhibitor, etc.) described later is 30% by mass or less. may contain.
In the present embodiment, the phosphinate compound is represented by the following general formula (i) and preferably contains at least one phosphinate selected from phosphinate and diphosphinate, more preferably phosphinate Phosphinates account for 70% by mass or more of the entire compound (100% by mass).
The following general formula (i):

[In the above formula (i), R ⁱ¹ and R ⁱ² each independently represent a linear or branched number of carbon atoms in which one or more hydrogen atoms may be substituted by a substituent R ⁱ³ . an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 10 carbon atoms or an aralkyl group having 6 to 14 carbon atoms,
The substituent R ⁱ³ is represented by the following formula (ii):

"In the above formula (ii), each R ⁱⁱ¹ is independently a linear or branched alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 10 carbon atoms, and * is another Represents a bond with an atom.”
M ⁱ is at least one selected from the group consisting of calcium ions, magnesium ions, aluminum ions, zinc ions, bismuth ions, manganese ions, sodium ions, potassium ions and protonated nitrogen bases, and p ⁺ is M represents the ionic valence of ⁱ and is a positive integer of 1 to 3, m ⁱ¹ is a positive integer of 1 to 3, n ^- represents a negative integer of -1, -2 or -3, r is a positive integer from 1 to 3, and |p ⁺ ×r|=|n ⁻ ×m ⁱ¹ |. Moreover, when there are a plurality of each of R ⁱ¹ and R ⁱⁱ¹ , each R ⁱ¹ and R ⁱⁱ¹ may be the same or different. ]
Therefore, as the phosphinate compound in the present embodiment, a known flame retardant other than the phosphinate represented by the general formula (i) is added at 30% by mass with respect to the entire phosphinate compound (100% by mass). May include:
In the above formula (i), the absolute value of the product of “p ⁺ ” and “r” representing the ionic valence of M ⁱ is equal to the absolute value of the product of “n ⁻ ” and “m ⁱ¹ ”.
In (i) above, p ⁺ is preferably 1 or 2. m ⁱ¹ is preferably 1 or 2. ^n- is preferably -1 or -2. r is preferably 1 or 2

［上記式（ｉｉｉ）中、Ｒ^１１及びＲ^１２は、各々独立して、直鎖状若しくは分岐状の炭素原子数１～６のアルキル基又は炭素原子数６～１０のアリール基であり、Ｍ^１は、カルシウムイオン、マグネシウムイオン、アルミニウムイオン、亜鉛イオン、ビスマスイオン、マンガンイオン、ナトリウムイオン、カリウムイオン及びプロトン化された窒素塩基からなる群より選ばれる少なくとも１種であり、ａ^＋はＭ^１のイオン価を表し、１～３の整数であり、ｍ^１は、１～３の整数であり、ａ＝ｍ^１である。Ｒ^１１及びＲ^１２がそれぞれ複数存在する場合は、それぞれのＲ^１１及びＲ^１２が同一であってもあるいは異なっていてもよい。］ In this embodiment, preferred phosphinate compounds are as represented by general formula (iii) below.

[In the above formula (iii), R ¹¹ and R ¹² are each independently a linear or branched alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 10 carbon atoms; ¹ is at least one selected from the group consisting of calcium ions, magnesium ions, aluminum ions, zinc ions, bismuth ions, manganese ions, sodium ions, potassium ions and protonated nitrogen bases, and a ⁺ is M ¹ is an integer of 1 to 3, m ¹ is an integer of 1 to 3, and a=m ¹ . When there are multiple R ¹¹ and R ¹² , each R ¹¹ and R ¹² may be the same or different. ]

［上記式（ｉｖ）中、Ｒ^２１及びＲ^２２は、各々独立して、直鎖状若しくは分岐状の炭素原子数１～６のアルキル基又は炭素原子数６～１０のアリール基であり、Ｌ^２３は、直鎖状若しくは分岐状の炭素原子数１～１０のアルキレン基、炭素原子数６～１０のアリーレン基、炭素原子数６～１４のアルキルアリーレン基又は炭素原子数６～１４のアリールアルキレン基であり、Ｍ^２は、カルシウムイオン、マグネシウムイオン、アルミニウムイオン、亜鉛イオン、ビスマスイオン、マンガンイオン、ナトリウムイオン、カリウムイオン及びプロトン化された窒素塩基からなる群より選ばれる少なくとも１種であり、ｂ^＋はＭ^２のイオン価を表し、１～３の整数であり、ｍ^２は、１～３の整数であり、ｑは、１又は２の整数であり、ｂ×ｑ＝２ｍ^２である。Ｒ^２１及びＲ^１２がそれぞれ複数存在する場合は、それぞれのＲ^２１及びＲ^２２が同一であってもあるいは異なっていてもよい。］からなる群より選ばれる少なくとも１種が挙げられる。 In this embodiment, a preferred diphosphinate is represented by general formula (iv) below.

[In formula (iv) above, R ²¹ and R ²² are each independently a linear or branched alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 10 carbon atoms; ²³ is a linear or branched alkylene group having 1 to 10 carbon atoms, an arylene group having 6 to 10 carbon atoms, an alkylarylene group having 6 to 14 carbon atoms, or an arylalkylene group having 6 to 14 carbon atoms; is a group, and ^M2 is at least one selected from the group consisting of calcium ion, magnesium ion, aluminum ion, zinc ion, bismuth ion, manganese ion, sodium ion, potassium ion and protonated nitrogen base; b ⁺ represents the ionic valence of M ² and is an integer from 1 to 3, m ² is an integer from 1 to 3, q is an integer from 1 or 2, and b×q=2m ² . When there are multiple R ²¹ and R ¹² , each R ²¹ and R ²² may be the same or different. ] At least 1 sort(s) chosen from the group which consists of is mentioned.

In the above formulas (i), (ii), (iii) and (iv), the linear or branched alkyl group having 1 to 6 carbon atoms includes, for example, methyl group, ethyl group, propyl group, butyl straight-chain alkyl groups such as radicals, amyl groups, or hexyl groups; and branched alkyl groups such as isopropyl groups, isobutyl groups, s-butyl groups, t-butyl groups, isoamyl groups, or t-amyl groups. be done.
In formulas (i), (ii), (iii) and (iv), the aryl group having 6 to 10 carbon atoms may have a monocyclic structure or a condensed ring structure. Examples include phenyl or naphthyl groups.
In the above formula (iv), the linear or branched alkylene group having 1 to 10 carbon atoms is obtained by removing one hydrogen atom from the linear or branched alkyl group having 1 to 6 carbon atoms. groups.
In the above formula (iv), the arylene group having 6 to 10 carbon atoms includes a group obtained by removing one hydrogen atom from the above aryl group having 6 to 10 carbon atoms.
In the above formula (i), the aralkyl group having 6 to 14 carbon atoms is a benzyl group, a phenylethyl group, a phenylpropyl group, a phenylbutyl group, a methylphenyl group, an ethylphenyl group, a propylphenyl group, a butylphenyl group, a methyl A naphthyl group, an ethylnaphthyl group, or a tert-butylnaphthyl group can be mentioned.
In the above formula (iv), the alkylarylene group having 6 to 14 carbon atoms includes methylphenylene group, ethylphenylene group, tert-butylphenylene group, methylnaphthylene group, ethylnaphthylene group and tert-butylnaphthylene group.
In the above formula (iv), examples of the arylalkylene group having 6 to 14 carbon atoms include a phenylmethylene group, a phenylethylene group, a phenylpropylene group and a phenylbutylene group.
In formula (iii) above, R ¹¹ and R ¹² are preferably each independently a linear alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 10 carbon atoms.
In formula (iii) above, M ¹ is preferably calcium, magnesium, aluminum, or zinc. Also, a represents the ionic valence of ^M1 , which is 2 or 3.
In formula (iv) above, R ²¹ and R ²² are each independently preferably a linear alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 10 carbon atoms.
In the above formula (iv), each L ²³ is preferably independently a linear alkylene group having 1 to 6 carbon atoms or an arylene group having 6 to 10 carbon atoms.
In formula (iv) above, ^M2 is preferably calcium, magnesium, aluminum, or zinc. Also, b represents the ion valence of ^M2 , which is 2 or 3.
Phosphinate compounds have excellent electrical properties, making them suitable for flame-retardant materials that require insulation. They are also excellent in hydrolyzability, so they can be used in high-temperature, high-humidity applications and have excellent recyclability.

The phosphinates used in this embodiment are prepared, inter alia, using phosphinic acids and metal carbonates, metal hydroxides or metal oxides in aqueous solutions and are essentially monomeric compounds, although reaction conditions may vary. Depending on the circumstances, polymeric phosphinates with a degree of condensation of 1-3 are also included.

Examples of such phosphinates include, but are not limited to, calcium dimethylphosphinate, magnesium dimethylphosphinate, aluminum dimethylphosphinate, zinc dimethylphosphinate, calcium ethylmethylphosphinate, magnesium ethylmethylphosphinate, aluminum ethylmethylphosphinate, zinc ethylmethylphosphinate, calcium diethylphosphinate, magnesium diethylphosphinate, aluminum diethylphosphinate, zinc diethylphosphinate, calcium methyl-n-propylphosphinate, magnesium methyl-n-propylphosphinate, aluminum methyl-n-propylphosphinate, zinc methyl-n-propylphosphinate, calcium methanedi(methylphosphinate), magnesium methanedi(methylphosphinate), aluminum methanedi(methylphosphinate), zinc methanedi(methylphosphinate), Benzene-1,4-(dimethylphosphinate) calcium, Benzene-1,4-(dimethylphosphinate) magnesium, Benzene-1,4-(dimethylphosphinate) aluminum, Benzene-1,4-(dimethylphosphinate) zinc, calcium methylphenylphosphinate, magnesium methylphenylphosphinate, aluminum methylphenylphosphinate, zinc methylphenylphosphinate, calcium diphenylphosphinate, magnesium diphenylphosphinate, aluminum diphenylphosphinate, zinc diphenylphosphinate, dimethyl Calcium phosphinate, aluminum dimethylphosphinate, zinc dimethylphosphinate, calcium ethylmethylphosphinate, aluminum ethylmethylphosphinate, aluminum ethylbutylphosphinate, aluminum dibutylphosphinate, zinc ethylmethylphosphinate, calcium diethylphosphinate, diethylphosphine Aluminum acid and zinc diethylphosphinate are preferred, and aluminum diethylphosphinate is more preferred.
Commercially available products of the phosphinate compound (b) are not particularly limited, and examples thereof include Exolit (registered trademark) OP1230, OP1240, OP1311, OP1312, OP930, OP935 manufactured by Clariant Japan.

In this embodiment, the phosphinate compound is preferably particulate. When the phosphinate compound is granular, the average particle size of the phosphinate compound improves the mechanical strength and appearance of the molded article obtained by molding the flame-retardant resin composition of the present embodiment. In view of this, the particle size is preferably 100 μm or less, more preferably 50 μm or less, and still more preferably 20 μm or less, and the phosphinate compound is preferably pulverized to this particle size and used as a powder. It is preferably more than 0.5 μm and 20 μm, more preferably more than 1 μm and 20 μm or less. It is particularly preferable to use a powder having a preferred particle size because not only does it exhibit high flame retardancy, but it also significantly increases impact strength.
The method for measuring the average particle size of the particulate phosphinate compound is based on the volume-based particle size measured using a laser diffraction/scattering particle size distribution analyzer. Also, it is a value measured using a 3% isopropanol aqueous solution as a dispersion medium for the phosphinate compound. Specifically, using a laser diffraction/scattering particle size distribution analyzer LA-910 (manufactured by HORIBA, Ltd.), blank measurement was performed with a dispersion medium of 3% isopropanol aqueous solution, and then the measurement sample was passed through the specified transmission. It can be obtained by placing and measuring so that the ratio (95% to 70%) is obtained. The dispersion of the sample in the dispersion medium is performed by applying ultrasonic waves for 1 minute.
In addition, in this embodiment, the preferable content of the flame retardant (C) can be applied to the above-described preferable content of the phosphorus-based flame retardant in the styrene-based composition.

- Bromine Flame Retardant -
As the brominated flame retardant of the present embodiment, any brominated flame retardant (brominated flame retardant) normally used in this field can be used without limitation. or brominated bisphenol S compounds (e.g., brominated bisphenol A compounds, brominated bisphenol S compounds, brominated phenyl ethers, brominated bisphenol A carbonate oligomers, brominated bisphenol A epoxy resins), brominated phenyl ethers , brominated bisphenol A carbonate oligomers, brominated bisphenol A epoxy resins, brominated styrenes, brominated phthalimides, brominated benzenes, brominated cycloalkanes, and brominated isocyanurates. be able to. These bromine-based flame retardants may be used singly or in combination of two or more.

Brominated bisphenol A compounds or brominated bisphenol S compounds include compounds in which 1 to 8 bromine atoms are bonded to the benzene ring of a bisphenol A residue or bisphenol S residue, examples of which include tetrabrom Bisphenol A, Tetrabromobisphenol A bis(2-hydroxyethyl ether), Tetrabromobisphenol A bis(allyl ether), Tetrabromobisphenol A bis(2-bromoethyl ether), Tetrabromobisphenol A bis(3-bromopropyl ether) ), tetrabromobisphenol A bis(2,3-dibromopropyl ether), tetrabromobisphenol S, tetrabromobisphenol S bis(2-hydroxyethyl ether) and tetrabromobisphenol S bis(2,3-dibromopropyl ether ) etc. can be mentioned.

Commercially available brominated bisphenol A or brominated bisphenol S include "FR-1524" from Brochem Far East Co., Ltd., "Great Lakes BA-50" from Great Lakes Chemical Co., Ltd., " Great Lakes BA-50P", "Great Lakes BA-59", "Great Lakes BA-59P" and "Great Lakes PE-68", Albemarle's "Saytex RB-100", Teijin Kasei Co., Ltd.'s Fireguard 2000", "Fireguard 3000", "Fireguard 3100" and "Fireguard 3600", Marubishi Yuka Kogyo Co., Ltd.'s "Nonen PR-2", Tosoh Corporation's "Frame Cut 121R", "Fire Cut P-680" manufactured by Suzuhiro Kagaku Co., Ltd. can be mentioned.

Brominated phenyl ethers are compounds in which one or more bromine atoms are attached to a phenyl ether group, such as bis(tribromphenoxy)ethane, hexabromodiphenyl ether, octabromodiphenyl ether, decabromodiphenyl ether and polydibromphenylene. Oxide etc. can be mentioned.

Commercially available brominated phenyl ether flame retardants include "FR-1210" and "FR-1208" from Bromochem Far East Co., Ltd., and "Great Lakes FF-680" from Great Lakes Chemical Co., Ltd. , Great Lakes DE-83, Great Lakes DE-83R and Great Lakes DE-79, Saytex 102E and Saytex 111 from Albemarle.

（上記化学式（３）中、＊は結合手を表わす。） The brominated bisphenol A-based compound is preferably a compound having a chemical structure represented by the following chemical formula (3), including oligomers and polymers.

(In the above chemical formula (3), * represents a bond.)

で示される基を有する重合物であることが好ましい。なお、オリゴマーとは、重合度が１～１０のものをいう。なお、上記化学式（３－１）中、＊は結合手を表わす。 A brominated bisphenol A-based carbonate oligomer, which is an example of the compound represented by the above chemical formula (3), is represented by the following chemical formula (3-1)

It is preferably a polymer having a group represented by. The oligomer has a degree of polymerization of 1-10. In the above chemical formula (3-1), * represents a bond.

Examples of the polymer of the group represented by the above chemical formula (3-1) include flame retardants represented by the following compounds (3-2) and (3-3).

Commercially available flame retardants for the compound (3-1) include “Fireguard 7000” and “Fireguard 7500” manufactured by Teijin Chemicals.
Examples of commercially available flame retardants for the compound (3-2) include "Great Lakes BC-52" and "Great Lakes BC-58" available from Great Lakes Chemical Co., Ltd.

An example of the brominated bisphenol A-based epoxy resin, which is an example of the compound represented by the above chemical formula (3), is a compound represented by the following chemical formula (4).

Commercially available flame retardants of the above chemical formula (4) include various products depending on the degree of polymerization (m ³ ). "F-2400" and "F-2400H", "Platherm EP-16", "Platherm EP-30", "Platherm EP-100" and "Platherm EP-500" of Dainippon Ink and Chemicals Co., Ltd., Sakamoto "SR-T1000", "SR-T2000", "SR-T5000" and "SR-T20000" manufactured by Yakuhin Kogyo Co., Ltd. can be mentioned.

Further, examples of the brominated bisphenol A epoxy resin include a compound of the above formula (4) in which both terminal epoxy groups are blocked with a blocking agent and a compound in which one terminal epoxy group is blocked with a blocking agent. be able to. The blocking agent is not limited as long as it is a compound capable of ring-opening addition of an epoxy group. Among them, brominated phenols are preferred from the viewpoint of improving the flame retardant effect. be able to.

Examples of the flame retardant in which both terminal epoxy groups of the polymer are blocked with a blocking agent include flame retardants represented by the following compounds (4-1) and (4-2).

Commercially available flame retardants for the compounds (4-1) and (4-2) include "Platherm EC-14", "Platherm EC-20" and "Platherm EC-30" manufactured by DIC Corporation, Toto Examples include “TB-60” and “TB-62” manufactured by Kasei Co., Ltd., and “SR-T3040” and “SR-T7040” manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.

Examples of flame retardants in which only terminal epoxy groups on one side of the polymer are blocked with a blocking agent include flame retardants represented by the following compounds (4-3) and (4-4). .

Commercially available flame retardants for the compound (4-3) or (4-4) include “Platerm EPC-15F” from DIC Corporation, “E5354” from Yuka Shell Epoxy Co., Ltd., and the like. can be done.

及び当該化学式（５）の重合体、すなわち、下記化学式（５ａ）の繰り返し単位を有する重合体（ポリマー）

が挙げられ、好ましくは重合体である。 Brominated styrene flame retardants include brominated styrene monomers represented by the following chemical formula (5) in which 1 to 5 bromine atoms are bonded to the benzene ring of the styrene skeleton.

and the polymer of the chemical formula (5), i.e., a polymer having a repeating unit of the following chemical formula (5a)

and preferably a polymer.

Specific examples of brominated styrenes include bromstyrene and brominated polystyrene, and commercially available brominated polystyrene flame retardants include "Great Lakes PDBS" available from Great Lakes Chemical Co., Ltd. -10” and “Great Lakes PDBS-80”. "Pyrocheck 68PB" manufactured by Ferro Co., Ltd. can also be mentioned as an example of a brominated polystyrene-based flame retardant, although the production method is different from that of the flame retardant.

を挙げることができ、市販されている難燃剤としては、アルベマール（株）の「Ｓａｙｔｅｘ ＢＴ－９３」及び「Ｓａｙｔｅｘ ＢＴ－９３Ｗ」を挙げることができる。 Brominated phthalimide-based flame retardants are compounds in which 1 to 4 bromo atoms are bonded to the benzene ring of the phthalimide group, such as monobromophthalimide, dibromophthalimide, tribromophthalimide, tetrabromophthalimide, ethylenebis (monobromophthalimide), ethylenebis(dibromophthalimide), ethylenebis(tribromophthalimide) and ethylenebis(tetrabromophthalimide) of the following chemical formula (6)

Commercially available flame retardants include “Saytex BT-93” and “Saytex BT-93W” from Albemarle.

Brominated benzenes are compounds comprising a group in which one or more bromo atoms are bonded to a benzene ring, such as tetrabromobenzene, pentabromobenzene, hexabromobenzene, bromophenyl allyl ether, pentabromotoluene, 1, 1-bis(pentabromphenyl)ethane, 1,2-bis(pentabromphenyl)ethane, poly(pentabrombenzyl acrylate), and the like. Commercially available flame retardants include those of Albemarle Co., Ltd. "Saytex 8010" may be mentioned.

Brominated cycloalkane systems include brominated hydrocarbons in which from 1 to 6 bromo atoms are attached to cycloalkanes having from 6 to 12 carbon atoms (cycloaliphatic hydrocarbons). Examples of the cycloalkanes include cyclohexane and cyclododecane, and examples of brominated cycloalkanes include pentabromocyclohexane, hexabromocyclohexane, tetrabromocyclododecane, pentabromocyclododecane and hexabromocyclododecane. can be mentioned.
Examples of commercially available hexabromocyclododecane include "FR-1206" from Bromochem Far East Co., Ltd., "Saytex HBCD" from Albemarle Co., Ltd., and "Great Lakes CD-75P" from Great Lakes Chemical Co., Ltd. , Suzuhiro Chemical Co., Ltd. "Fire Cut P-880M" and Daiichi Kogyo Seiyaku Co., Ltd. "Pyroguard SR-103".

Brominated isocyanurates include compounds in which a bromine atom is bonded to an alkyl group having 2 to 6 carbon atoms (chain aliphatic hydrocarbon group) and an isocyanuric acid residue, and 1 to 5 Compounds in which a brominated phenoxy group in which a bromine atom is attached to a phenoxy group and an isocyanuric acid residue are exemplified. Specific examples include tris(monobromopropyl) isocyanurate, tris(2,3-dibromopropyl) isocyanurate, tris(tribromopropyl) isocyanurate, tris(tetrabromopropyl) isocyanurate, tris(pentabrom propyl)isocyanurate, tris(heptabromopropyl)isocyanurate, tris(octabromobutyl)isocyanurate, tris(monobromphenoxy)isocyanurate, tris(dibromophenoxy)isocyanurate, tris(tribromophenoxy)isocyanurate, tris(pentabromphenoxy)isocyanurate, tris(ethylmonobromphenoxy)isocyanurate and tris(propyldibromphenoxy)isocyanurate.
Commercially available brominated isocyanurates include "Taiku-6B" manufactured by Nippon Kasei Co., Ltd. and "Firecut P-660" manufactured by Suzuhiro Chemical Co., Ltd., and the like.

In addition to the widely used bromine-based flame retardants as described above, it is of course possible to use those listed in literature and catalogs of bromine-based flame retardant manufacturers. Brominated flame retardants include brominated phenols, brominated phenoxytriazines, brominated alkanes, brominated maleimides and brominated phthalates.

Brominated phenols are compounds in which 1 to 5 bromo atoms are bonded to a phenol group, such as monobromophenol, dibromophenol, tribromophenol, tetrabromophenol and pentabromophenol. can be done.

Brominated phenoxytriazines are compounds in which 1 to 5 bromo atoms are attached to the phenoxy group and 1 to 3 of the brominated phenoxy groups are attached to the triazine ring, such as mono(tribromophenoxy ) triazine, bis(monobromphenoxy)triazine, bis(tribromophenoxy)triazine, tris(dibromphenoxy)triazine and tris(tribromophenoxy)triazine, etc. Commercially available flame retardants include: Daiichi Kogyo Seiyaku Co., Ltd. "Pyrogard SR-245" can be mentioned.

A brominated alkane is a compound in which a bromine atom is bonded to an alkane having 2 to 6 carbon atoms (chain aliphatic hydrocarbon). Examples of said alkanes include ethane, propane, butane, pentane and hexane, and examples of brominated alkanes are dibromoethane, tetrabromoethane, monobromopropane, tribromopropane, hexabromopropane, octabrome. Propane, tetrabromobutane, hexabromobutane, octabromobutane, tribromopentane, pentabromopentane, octabromopentane, dibromohexane, tribromohexane, tetrabromohexane, hexabromohexane and octabromohexane and the like may be mentioned. can.

Brominated maleimides are compounds in which 1 to 5 bromo atoms are attached to a phenylmaleimide group, such as monobromophenylmaleimide, dibromophenylmaleimide, tribromophenylmaleimide and pentabromophenylmaleimide. be able to.

Bromated phthalates can include compounds having 1 to 4 bromo atoms attached to phthalic anhydride, examples of which include monobromo phthalic anhydride, dibromo phthalic anhydride, tribromo phthalic anhydride and tetrabromo phthalic anhydride. Phthalic acid and the like can be mentioned.

In order to further improve flame retardancy, flame retardant aids such as antimony trioxide are often used in combination. not something to give.
The amount of the flame retardant aid added is usually 0.5 to 10 parts by mass with respect to 100 parts by mass of polystyrene, but the preferred amount is 1 to 7 parts by mass in relation to physical properties. .
In addition, in this embodiment, the preferable content of the flame retardant (C) can be applied to the above-described preferable content of the bromine-based flame retardant in the styrene-based composition.

<Optional Addition Ingredients>
In addition to the above components (A) to (C), the recycled flame-retardant styrene resin composition of the present embodiment may optionally contain conventionally known additives and processing aids within a range that does not impair the effects of the present invention. Any additional component such as can be added. These additives, processing aids and the like include antioxidants, weathering agents, lubricants, antistatic agents, fillers and the like.

Examples of the antioxidant include phenol compounds, phosphorus compounds, thioether compounds, and the like.

Examples of the phenolic antioxidant include 2,6-di-tert-butyl-p-cresol, 2,6-diphenyl-4-octadecyloxyphenol, distearyl (3,5-di-tert-butyl -4-hydroxybenzyl)phosphonate, 1,6-hexamethylenebis[(3,5-di-tertbutyl-4-hydroxyphenyl)propionamide], 4,4′-thiobis(6-tert-butyl-m -cresol), 2,2′-methylenebis(4-methyl-6-tert-butylphenol), 2,2′-methylenebis(4-ethyl-6-tert-butylphenol), 4,4′-butylidenebis(6-tert -butyl-m-cresol), 2,2′-ethylidenebis(4,6-di-tert-butylphenol), 2,2′-ethylidenebis(4-sec-butyl-6-tert-butylphenol), 1, 1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 1,3,5-tris(2,6-dimethyl-3-hydroxy-4-tert-butylbenzyl)isocyanurate , 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl) -2,4,6-trimethylbenzene, 2-tert-butyl-4-methyl-6-(2-acryloyloxy-3-tert-butyl-5-methylbenzyl)phenol, stearyl [3-(3,5- di-tert-butyl-4-hydroxyphenyl) propionate], tetrakis [3-(3,5-di-tert-butyl-4-hydroxyphenyl) methyl propionate] methane, thiodiethylene glycol bis [(3,5-di -tert-butyl-4-hydroxyphenyl)propionate], 1,6-hexamethylenebis[(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], bis[3,3-bis(4- hydroxy-3-tert-butylphenyl)butyric acid]glycol ester, bis[2-tert-butyl-4-methyl-6-(2-hydroxy-3-tert-butyl-5-methylbenzyl)phenyl]terephthalate, 1,3,5-tris[(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxyethyl]isocyanurate, 3,9-bis[1,1-dimethyl-2-{(3-tert -Butyl-4-hydroxy-5-methylphenyl)propionyloxy}ethyl]-2,4,8,10-tetraoxaspiro[5,5]undecane, triethylene glycol bis[(3-tert-butyl-4- hydroxy-5-methylphenyl)propionate] and the like. These may be used singly or in combination of two or more.

Examples of the phosphorus antioxidant include tris(2,4-di-tert-butylphenyl)phosphite, trisnonylphenylphosphite, tris[2-tert-butyl-4-(3-tert-butyl- 4-hydroxy-5-methylphenylthio)-5-methylphenyl]phosphite, tridecylphosphite, octyldiphenylphosphite, di(decyl)monophenylphosphite, di(tridecyl)pentaerythritol diphosphite, di( nonylphenyl)pentaerythritol diphosphite, bis(2,4-tert-butylphenyl)pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite, bis (2,4,6-tri-tert-butylphenyl) pentaerythritol diphosphite, bis(2,4-dicumylphenyl) pentaerythritol diphosphite, tetra(tridecyl)isopropylidene diphenol diphosphite, tetra( tridecyl)-4,4′-n-butylidenebis(2-tert-butyl-5-methylphenol) diphosphite, hexa(tridecyl)-1,1,3-tris(2-methyl-4-hydroxy-5-tert- butylphenyl)butane triphosphite, tetrakis(2,4-di-tert-butylphenyl)biphenylenediphosphonite, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 2,2 '-methylenebis(4,6-tert-butylphenyl)-2-ethylhexylphosphite, 2,2'-methylenebis(4,6-tert-butylphenyl)-octadecylphosphite, 2,2'-ethylidenebis(4 ,6-di-tert-butylphenyl)fluorophosphite, tris(2-[(2,4,8,10-tetrakis-tert-butyldibenzo[d,f][1,3,2]dioxaphosphite Pin-6-yl)oxy]ethyl)amine, phosphite of 2-ethyl-2-butylpropylene glycol and 2,4,6-tri-tert-butylphenol and the like. These may be used singly or in combination of two or more.

Examples of the thioether antioxidant include dialkyl thiodipropionates such as dilauryl thiodipropionate, dimyristyl thiodipropionate, distearyl thiodipropionate, and pentaerythritol tetra(β-alkylmercaptopropionate). These may be used singly or in combination of two or more.

An ultraviolet absorber or the like can be used as the weather resistant agent. Examples of the ultraviolet absorber include 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 5,5′-methylenebis(2-hydroxy-4-methoxybenzophenone ) and other 2-hydroxybenzophenones; 2-(2′-hydroxy-5′-methylphenyl)benzotriazole, 2-(2′-hydroxy-3′,5′-di-tert-butylphenyl)-5- Chlorobenzotriazole, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-5'-tert -octylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-dicumylphenyl)benzotriazole, 2,2'-methylenebis(4-tert-octyl-6-(benzotriazolyl) ) phenol), 2-(2′-hydroxyphenyl)benzotriazoles such as 2-(2′-hydroxy-3′-tert-butyl-5′-carboxyphenyl)benzotriazole; phenyl salicylate, resorcinol monobenzoate, 2 ,4-di-tert-butylphenyl-3,5-di-tert-butyl-4-hydroxybenzoate, 2,4-di-tert-amylphenyl-3,5-di-tert-butyl-4-hydroxybenzoate , hexadecyl-3,5-di-tert-butyl-4-hydroxybenzoate, and other benzoates; 2-ethyl-2'-ethoxyoxaanilide, 2-ethoxy-4'-dodecyloxanilide, and other substituted oxanilides cyanoacrylates such as ethyl-α-cyano-β, β-diphenylacrylate, methyl-2-cyano-3-methyl-3-(p-methoxyphenyl)acrylate; 2-(2-hydroxy-4-octoxy phenyl)-4,6-bis(2,4-di-tert-butylphenyl)-s-triazine, 2-(2-hydroxy-4-methoxyphenyl)-4,6-diphenyl-s-triazine, 2- triaryltriazines such as (2-hydroxy-4-propoxy-5-methylphenyl)-4,6-bis(2,4-di-tert-butylphenyl)-s-triazine; These may be used singly or in combination of two or more.

Fatty acid amides, fatty acid esters, fatty acids, fatty acid metal salts, and the like can be used as the lubricant.

Examples of the aliphatic amide-based lubricants include stearamide, oleic acid amide, erucic acid amide, behenic acid amide, ethylene bis stearic acid amide, ethylene bis oleic acid amide, ethylene bis erucic acid amide, and ethylene bis lauric acid amide. mentioned. These may be used singly or in combination of two or more.

Examples of the aliphatic ester-based lubricants include methyl laurate, methyl myristate, methyl palmitate, methyl stearate, methyl oleate, methyl erucate, methyl behenate, butyl laurate, butyl stearate, isopropyl myristate, and palmitin. Isopropyl acid, octyl palmitate, coconut fatty acid octyl ester, octyl stearate, tallow fatty acid octyl ester, lauryl laurate, stearyl stearate, behenyl behenate, cetyl myristate, C28-30 linear unbranched Ester of saturated monocarboxylic acid (hereinafter abbreviated as montanic acid) and ethylene glycol, ester of montanic acid and glycerol, ester of montanic acid and butylene glycol, ester of montanic acid and trimethylolethane, ester of montanic acid and trimethylolpropane , esters of montanic acid and pentaerythritol, glycerin monostearate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan sesquioleate, sorbitan trioleate, polyoxyethylene sorbitan monolaurate, Polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan trioleate and the like. These may be used singly or in combination of two or more.

Specific examples of saturated fatty acids among the above fatty acid-based lubricants include lauric acid (dodecanoic acid), isodecanoic acid, tridecylic acid, myristic acid (tetradecanoic acid), pentadecylic acid, palmitic acid (hexadecanoic acid), margaric acid (heptadecane acid), stearic acid (octadecanoic acid), isostearic acid, tubercrostearic acid (nonadecanic acid), 2-hydroxystearic acid, arachidic acid (icosanoic acid), behenic acid (docosanoic acid), lignoceric acid (tetradocosanoic acid), serotin acid (hexadocosanoic acid), montanic acid (octadocosanoic acid), melissic acid and the like, particularly lauric acid, palmitic acid, stearic acid, behenic acid, 12-hydroxystearic acid and montanic acid.

Among the fatty acid-based lubricants, unsaturated fatty acids include, specifically, myristoleic acid (tetradecenoic acid), palmitoleic acid (hexadecenoic acid), oleic acid (cis-9-octadecenoic acid), elaidic acid (trans-9- octadecenoic acid), ricinoleic acid (octadecadienoic acid), vaccenic acid (cis-11-octadecenoic acid), linoleic acid (octadecadienoic acid), linolenic acid (9,11,13-octadecatrienoic acid), elestearin acid (9,11,13-octadecatrienoic acid), gadoleic acid (icosanoic acid), erucic acid (docosanoic acid), nervonic acid (tetradocosanoic acid) and the like. These may be used singly or in combination of two or more.

Examples of the fatty acid metal salt-based lubricant include the lithium salt, calcium salt, magnesium salt, and aluminum salt of the fatty acid of the fatty acid-based lubricant. These may be used singly or in combination of two or more.

Cationic, anionic, nonionic, amphoteric, and fatty acid partial esters such as glycerin fatty acid monoester can be used as the antistatic agent. Specifically, alkyltrimethylammonium salts, dialkyldimethylammonium salts, benzalkonium salts, N,N-bis(2-hydroxyethyl)-N-(3-dodecyloxy-2-hydroxypropyl)methylammonium mesosulphate , (3-laurylamidopropyl)trimethylammonium methylsulfate, stearamidopropyldimethyl-2-hydroxyethylammonium nitrate, stearamidopropyldimethyl-2-hydroxyethylammonium phosphate, cationic polymer, alkylsulfonate , Alkyl benzene sulfonate, Sodium alkyl diphenyl ether disulfonate, Alkyl nitrate ester salt, Phosphate alkyl ester salt, Alkyl phosphate amine salt, Stearate monoglyceride, Pentaerythritol fatty acid ester, Sorbitan monopalmitate, Sorbitan monostearate, Diglycerin fatty acid Esters, alkyldiethanolamines, alkyldiethanolamine fatty acid monoesters, alkyldiethanolamides, polyoxyethylene dodecyl ethers, polyoxyethylene alkylphenyl ethers, polyethylene glycol monolaurates, polyoxyethylene alkylamines, polyoxyethylene alkylamides, polyether block copolymers , cetyl betaine, hydroxyethylimidazoline sulfate, and the like. These may be used singly or in combination of two or more.

Talc, calcium carbonate, barium sulfate, carbon fiber, mica, wollastonite, whiskers, and the like can be used as the filler.

In the present embodiment, the recycled flame-retardant styrenic resin composition used as the recycled flame retardant masterbatch and the composition containing the recycled flame retardant masterbatch contain the additives and processing aids described above, as well as an antiblocking agent. , a coloring agent, an anti-blooming agent, a surface treatment agent, an antibacterial agent, an anti-stain agent (silicone oil described in JP-A-2009-120717, a monoamide compound of a higher aliphatic carboxylic acid, and a higher aliphatic carboxylic acid and 1 An optional additive component such as a die build-up inhibitor such as a monoester compound obtained by reacting with a hydric to trihydric alcohol compound may be contained. The total content of optional components such as additives and processing aids may be 0.05 to 5% by mass in the recycled flame-retardant styrenic resin composition.

The recycled flame-retardant styrenic resin composition of the present embodiment may consist essentially of components (A) to (C) and optional additive components. Further, it may consist of only components (A) to (C), or only components (A) to (C) and optionally added components.

The expression "consisting essentially of components (A) to (C) and optional additional components" means that 95 to 100% by mass (preferably 98 to 100% by mass) of the recycled flame-retardant styrene resin composition is ( It means the components A) to (C), or the components (A) to (C) and an optional additive component.

The recycled flame-retardant styrenic resin composition of the present embodiment may contain unavoidable impurities in addition to components (A) to (C) and optional additive components within a range that does not impair the effects of the present invention. .

<Method for Recycling Recycled Flame-Retardant Styrenic Resin Composition>
If the recovered styrene-based resin (A) is for home electric appliances or OA products, the recovered styrene-based resin is sorted out from the recovered products and pulverized to the extent that re-compounding is required. Then, the crushed and collected styrene resin is washed, dehydrated and dried. If the recovered styrene-based resin (A) has a size suitable for pellets or compounds, it is not pulverized, and if it is not soiled, the washing step is not necessary. The recovered styrene resin (A) thus obtained is optionally mixed with a predetermined amount of a NOR hindered amine compound (B) and a flame retardant (C), and after dry blending, the mixture is put into a hopper, Melt and knead to create pellets. For example, a method using a high-speed stirrer typified by a Henschel mixer, a batch kneader typified by a Banbury mixer, a single-screw or twin-screw continuous kneader, a roll mixer, or the like may be used alone or in combination. The heating temperature during kneading is usually selected in the range of 180 to 260°C. At the time of melting and kneading, foreign matter is removed with a mesh or the like, and metal is removed using a magnet or a metal detector.
The recycling method for the recycled flame-retardant styrene resin composition in the present embodiment includes step (II) of melt-kneading the recovered styrene-based resin (A) at a temperature of 180 to 260° C. to prepare a melt-kneaded product. have In addition, a suitable example of the method for recycling the recycled flame-retardant styrene resin composition in the present embodiment includes the step (I) of sorting the recovered styrene resin (A) from the recovered product, and the sorted recovered styrene and a step (II) of melt-kneading the system resin (A) in a temperature range of 180 to 260° C. to prepare a melt-kneaded product. Further, it may have a step (III) of blending the NOR-type hindered amine compound (B) within the range of 0.3 to 3.5 mass % of the entire melt-kneaded product. Furthermore, it may have a step (IV) of blending the flame retardant (C) within the range of 1 to 25% by mass of the melt-kneaded product as a whole. After the step (II), a step (V) of removing foreign matters of 20 μm or more with a sieve or mesh may be further included. After the step (II), a step (VI) of removing metal having a size of 20 μm or more using a magnet or a metal detector may be further included.
As the recovered product, it is preferable to select a material containing 70% by mass or more of styrene-based monomer units. Examples of collected products include pre-consumer materials such as factory-collected products, post-consumer materials such as market-collected products, long-term inventory pellets, non-standard pellets, and the like.

[Characteristics of recycled flame-retardant styrene resin composition]
<Flame Retardant>
The flame retardancy of the recycled flame-retardant styrene resin composition of the present embodiment is within the standard in the UL94 vertical combustion test (UL94-V test), that is, the flame retardancy class of V-0 to V-2. is preferably In addition, in UL94 horizontal combustion (UL94-HB test), it is desirable that the burning rate is 75 mm / min or less, which is within the HB standard, and considering standards such as automobile flame retardant standards (FMVSS302), it is 85 mm / min or less. is preferred. In the present disclosure, flame retardancy can be evaluated by the method described in the section [Examples] below.

<Thermal stability>
Regarding the thermal stability of the recycled flame-retardant styrene-based resin composition of the present embodiment, it is preferable that molding failure, color tone change, and discoloration due to gas generation do not occur during molding.

<Light resistance>
Regarding the light resistance of the recycled flame-retardant styrene resin composition of the present embodiment, the color difference ΔE is preferably 10 or less, more preferably 5 or less. If it is more than 10, it may not be used outdoors due to reduced strength, and may be discolored indoors, impairing design and recyclability.
In the present disclosure, the color difference ΔE is the color difference (ΔE) after 300 hours while maintaining the temperature of the black panel at 63° C. using a xenon lamp weather meter in accordance with JIS K7103 and JIS K7105. is the value measured by the value of

[Molding]
The recycled flame-retardant styrenic resin composition of the present embodiment is produced by injection molding or injection compression molding using the above melt-kneading molding machine or pellets of the obtained recycled flame-retardant styrenic resin composition as raw materials. Molded articles can be produced by methods such as extrusion molding, blow molding, press molding, vacuum molding, foam molding, and the like.
Molded articles containing the recycled flame-retardant styrene resin composition of the present embodiment, preferably injection molded articles (including injection compression), copiers, facsimiles, televisions, radios, tape recorders, video decks, personal computers, printers, It is suitably used for office automation equipment such as telephones, information terminals, refrigerators and microwave ovens, household appliances, housings and various parts of electrical and electronic equipment, foamed heat insulating materials, insulating films, and the like.

EXAMPLES The embodiments of the present invention will be described in more detail below based on Examples and Comparative Examples, but the present invention is not limited to these Examples.

"Measurement and evaluation methods"
The physical properties of the resin compositions obtained in Examples and Comparative Examples were measured and evaluated according to the following methods.

(1) Evaluation of flame retardancy (i) Evaluation of combustion grade and evaluation of burning time Using a combustion test piece (size: 127 mm × 12.7 mm, thickness: 0.8 mm) prepared by the method described later, 50 W Flame retardancy was evaluated by a method conforming to the UL94 vertical burning test (UL94-V test) using a test flame. A flame of a gas burner was applied to the combustion test piece, and the degree of combustion was evaluated.
The flame retardant grade indicates the flame retardant class classified by the UL94-V test. Five tests were performed on all test pieces, and judgment was made. The outline of the classification method is as follows.
V-0: total burning time of 5 tubes 50 seconds or less, maximum burning time 10 seconds or less, no dripping cotton ignition V-1: total burning time of 5 tubes 250 seconds or less, maximum burning time 30 seconds or less, dripping cotton ignition not V-2: Total burning time of 5 tubes is 250 seconds or less, maximum burning time is 30 seconds or less, dripping cotton ignites Not V: Non-compliant with UL94

(ii) Combustion rate Three test pieces (b) (size: 127 mm × 12.7 mm, thickness: 0.8 mm) prepared by the method described below were used in the same manner as in the evaluation of combustibility in (i) above. The burning rate (mm/min) was measured by the UL94 horizontal burning test.

(2) Evaluation of thermal stability Using an injection molding machine (manufactured by Toshiba Machine Co., Ltd., EC60N), cylinder temperature 240 ° C., mold temperature 50 ° C., injection pressure (gauge pressure 40-60 MPa), injection speed (panel setting Value) 50%, injection time/cooling time = 5 sec/100 sec Cooling time is set to 100 sec, a 3 mm thick plate is molded, and the appearance and color change of the plate at the 5th shot are measured by the method described below. A visual comparison was made with a 3 mm plate. The results are shown in Tables 1 and 2. In Tables 1 and 2, "silver" indicates that silver streaks are observed on the 3-mm plate, and "discoloration" indicates that the hue is wholly or partially discolored to brown.

(3) Evaluation of light resistance Using a 3 mm thick plate produced by the method described in Examples 1 to 12 below, evaluation was made in accordance with JIS K7103 and JIS K7105. That is, using a xenon lamp type weather meter [Atlas; Ci65], the temperature of the black panel was maintained at 63°C, and the color difference (ΔE) between the start of measurement and 300 hours after the start of measurement was evaluated. bottom. This ΔE was measured using a spectroscopic color difference meter (manufactured by Nippon Denshoku Industries Co., Ltd.) under the following conditions.
(a) Lamp: Halogen lamp; 12V, 50W [manufactured by NARVA]
(b) wavelength of light: 400-700 nm
(c) Light source: C light source 2 degree field of view (d) Measurement hole: diameter 30 mm
(e) Measurement object: Reflected light

Materials used in Examples and Comparative Examples are as follows.

<(A) Component>
High-impact polystyrene recovered from home appliances was used as recovered styrene resin (A-1). It had an MFR of 5.6, a rubber-like polymer content of 7.5% by mass, and an average particle size of 1.6 μm.
Polystyrene recovered from home electric appliances was used as the recovered styrene resin (A-2). MFR was 2.3.
The high-impact polystyrene and polystyrene collected from home appliances mentioned above are those collected as styrene resin contained in home appliances collected under the Home Appliance Recycling Law, and are collected from resin products labeled as polystyrene. used.

<Rubber-modified styrene resin (HIPS)>
A rubber-modified styrenic resin, which is high impact polystyrene (HIPS) with an MFR of 7.0, was used. The HIPS used polybutadiene as a rubber-like polymer and had a rubber-like polymer content of 8.6% by mass. The average particle size of the high impact polystyrene (HIPS) was 1.5 μm.

<HIPS containing NOR type hindered amine compound (B) (NOR-HIPS-1)>
A rubber-modified styrenic resin, which is MFR 8.2 polystyrene (HIPS) containing 3% by mass of the rubber-modified styrenic resin, was used. The HIPS used polybutadiene as a rubber-like polymer, and the content of the rubber-like polymer was 8.5% by mass. The average particle size of the high impact polystyrene (HIPS) was 1.5 μm. This HIPS is prepared by adding 0.2 parts by mass of Irganox 1076 and Irgafos 168 and then premixing them, then collectively mixing the obtained premixtures, using a twin-screw extruder (manufactured by Toshiba Machine Co., Ltd., TEM-26SS), extruding at 220°C. Melt extrusion (screw rotation speed: 150 rpm, discharge rate: 10 kg/hr) was performed within the range to prepare pellets.

<HIPS containing NOR-type hindered amine compound (B1) (NOR-HIPS-2)>
The NOR-HIPS-1 pellets were left in an oven at 80° C. for 30 days to prepare long-term stock pellet equivalents.

<(B) Component>
As the NOR-type hindered amine compound (B1) (also referred to as NOR-HALS-B1 in Tables 1 and 2), [Flamestab NOR116FF, NOR-type polymer type manufactured by BASF] was used.
As the NOR-type hindered amine compound (B2) (also referred to as NOR-HALS-B2 in Tables 1 and 2), [adekastab LA-81 NOR type manufactured by ADEKA Corporation] was used.

<(C) Component>
[HCA, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide] manufactured by Sanko Co., Ltd. was used as the phosphinic acid compound (also referred to as C-1 in Tables 1 and 2). bottom.
[Resorcinol bis-dixylenyl phosphate, manufactured by Daihachi Chemical Industry Co., Ltd., PX-200] was used as the phosphate ester (also referred to as C-2 in Tables 1 and 2).
[Bis(pentabromphenyl)ethane, Saytex8010, Albemarle Co., Ltd.] was used as the bromine-based flame retardant (also referred to as C-3 in Tables 1 and 2).

<Additive>
(Phenolic antioxidant)
- Stearyl [3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] [manufactured by BASF, Irganox1076]
(Phosphorus antioxidant)
- Tris (2,4-di-tert-butylphenyl) phosphite [manufactured by BASF, Irgafos168]

[Examples 1 to 12]
0.2 parts by mass of Irganox 1076 and Irgafos 168 were added to a total of 100 parts by mass of each component and components (A) and (B) in the composition ratio shown in Table 1, and then premixed. The resulting preliminary mixture is mixed together and melt extruded at a temperature of 180° C. to 230° C. using a twin-screw extruder (TEM-26SS, manufactured by Toshiba Machine Co., Ltd.) (screw rotation speed is 150 rpm, discharge rate is 10 kg/hr. ) to prepare a recycled flame-retardant styrene-based resin composition in the form of pellets.
Using an injection molding machine (manufactured by Toshiba Machine Co., Ltd., EC60N), the pelletized recycled flame-retardant styrene resin composition thus obtained was molded at a cylinder temperature of 220°C, a mold temperature of 50°C, and an injection pressure ( Gauge pressure 40-60 MPa), injection speed (panel set value) 50%, injection time/cooling time = 5 sec/20 sec to prepare a 3 mm plate and prepare a comparative sample for light resistance evaluation. Further, a comparative sample was prepared by the method described in the column of evaluation of thermal stability using the pellet-shaped recycled flame-retardant styrene resin composition. Table 1 shows the evaluation results of light resistance and the evaluation results of thermal stability.
Furthermore, a combustion test piece was prepared using the pellet-shaped recycled flame-retardant styrene-based resin composition under the same conditions as the 3 mm plate using a double-ended gate flat plate mold with dimensions of 127 mm × 12.7 mm × thickness 0.8 mm. Then, flame retardancy was measured. Table 1 shows the results. Furthermore, the evaluation results of the first burning time (seconds) in the first set of the UL94-V test of Examples 1 to 12 are shown in Table 1 below.

[Comparative Examples 1 to 10]
Comparative Examples 1 to 10 were carried out in the same manner as in Example 1, except that the compositions were changed as shown in Table 1. Table 2 shows the results of measurement and evaluation of physical properties of Comparative Examples 1-10.

As shown in Table 1 above, Examples 1 to 12 have high flame retardancy, good thermal stability, and good light resistance. Addition of the flame retardant (C) further reduces the burning rate and improves flame retardancy. In particular, when a phosphorus-based flame retardant is used in combination, the light resistance is further improved. In particular, the reduced thermal stability and light resistance of the recovered styrene-based resin (A) can be recovered.

On the other hand, in Comparative Examples 1 to 4, as shown in Table 2, flame retardancy, thermal stability, and light resistance are insufficient unless the NOR-type hindered amine compound (B) and flame retardant (C) are contained. It can be seen from Comparative Example 4 that the recovered styrene resin is inferior in heat stability and light resistance.

Regarding Comparative Examples 5 to 10, as shown in Table 2, the addition of a flame retardant improves flame retardancy, but the improvement in thermal stability and light resistance is insufficient.

The recycled flame-retardant styrene-based resin composition of the present invention and molded articles containing the recycled flame-retardant styrene-based resin composition can be used for computer parts such as desktop personal computers and laptop computers, mobile phone parts, electrical and electronic equipment, and mobile phones. It can be suitably used for sheets, films, foams, etc. for information terminals, home appliance parts, automobile parts, industrial materials, building materials, and the like.

Claims (6)

A recycled flame-retardant styrene-based resin composition containing a recovered styrene-based resin (A) and a NOR-type hindered amine-based compound (B). The recycled flame-retardant styrene according to claim 1, wherein the content of said NOR-type hindered amine compound (B) is 0.1 to 5.0 parts by mass with respect to 100 parts by mass of said recovered styrene resin (A). system resin composition. 3. The recycled flame-retardant styrene resin composition according to claim 1, wherein the recovered styrene resin is 50% or more. The recycled flame-retardant styrene according to any one of claims 1 to 3, further comprising 0.1 to 30 parts by mass of a flame retardant (C) with respect to 100 parts by mass of the recovered styrene resin (A). system resin composition. The recycled flame-retardant styrenic resin composition according to any one of claims 1 to 4, wherein the flame retardant (C) is a phosphorus-based flame retardant. A molded article comprising the recycled flame-retardant styrene resin composition according to any one of claims 1 to 5.