WO2022004508A1 - スチレン系樹脂組成物、及びその成形品 - Google Patents
スチレン系樹脂組成物、及びその成形品 Download PDFInfo
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- WO2022004508A1 WO2022004508A1 PCT/JP2021/023725 JP2021023725W WO2022004508A1 WO 2022004508 A1 WO2022004508 A1 WO 2022004508A1 JP 2021023725 W JP2021023725 W JP 2021023725W WO 2022004508 A1 WO2022004508 A1 WO 2022004508A1
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- styrene
- resin composition
- monomer unit
- based resin
- based monomer
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F212/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
- C08F212/02—Monomers containing only one unsaturated aliphatic radical
- C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F212/06—Hydrocarbons
- C08F212/08—Styrene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/07—Aldehydes; Ketones
- C08K5/08—Quinones
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/08—Copolymers of styrene
- C08L25/14—Copolymers of styrene with unsaturated esters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
- C08J2325/02—Homopolymers or copolymers of hydrocarbons
- C08J2325/04—Homopolymers or copolymers of styrene
- C08J2325/08—Copolymers of styrene
- C08J2325/14—Copolymers of styrene with unsaturated esters
Definitions
- the present invention relates to a styrene-based resin composition and a molded product thereof.
- the styrene-based resin composition is used in various applications such as optical members and containers, and in various environments (Patent Document 1 and the like).
- the present invention has been made in view of such a problem, and provides a styrene-based resin composition having an excellent hue and a molded product thereof.
- the styrene-based resin (A) and the component (B) are contained, and the styrene-based resin (A) is a styrene-based monomer unit (a1) and a (meth) acrylic acid-based monomer unit. It is a copolymer containing (a2), the component (B) contains 4-methoxyphenol or hydroquinone, and the content of the component (B) is 1 ⁇ g or more and less than 16 ⁇ g per 1 g of the styrene resin (A).
- a styrene-based resin composition is provided.
- the present inventors have found that the hue is excellent by keeping the content of 4-methoxyphenol and / or hydroquinone contained in the styrene-based resin composition within a predetermined range, and the present invention has been made. Was completed.
- the styrene-based monomer unit (a1) and the (meth) acrylic acid-based monomer unit (a2) are contained, and the styrene-based monomer unit (a1) and the (meth) acrylic acid-based monomer unit are included.
- the total content of the unit (a2) is 100% by mass
- the content of the styrene-based monomer unit (a1) is 99.9 to 40% by mass
- the (meth) acrylic acid-based simple substance is used.
- the content of the weight unit (a2) is 0.1 to 60% by mass.
- the (meth) acrylic acid-based monomer unit (a2) is a methacrylic acid monomer unit.
- a molded product made of the above styrene resin composition is preferable.
- a light guide body made of the above-mentioned molded product is preferable.
- a film made of the above styrene resin composition is preferable.
- a foamed sheet made of the above styrene resin composition is preferable.
- the styrene-based resin composition according to the embodiment of the present invention contains a styrene-based resin (A) and a component (B).
- the styrene-based resin (A) is a copolymer containing a styrene-based monomer unit (a1) and a (meth) acrylic acid-based monomer unit (a2). That is, it is a copolymer obtained by copolymerizing a monomer containing a styrene-based monomer and a (meth) acrylic acid-based monomer.
- the styrene-based monomer unit (a1) is a unit constituting the styrene-based resin (A), and is a monomer unit derived from these styrene-based monomers.
- the styrene-based monomer is a monocyclic or polycyclic aromatic vinyl-based monomer, for example, styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, 2,4-dimethylstyrene, 2, 5-dimethylstyrene, 3,4-dimethylstyrene, 3,5-dimethylstyrene, p-ethylstyrene, m-ethylstyrene, Occasionally-ethylstyrene, p-tert-butylstyrene, 1-vinylnaphthalene, 2-vinylnaphthalene , 1,1-Dipheny
- the (meth) acrylic acid-based monomer is, for example, one or both of acrylic acid and methacrylic acid, preferably methacrylic acid.
- the (meth) acrylic acid-based monomer unit (a2) is a unit constituting the styrene-based resin (A), and is a monomer unit derived from these (meth) acrylic acid-based monomers, preferably. Monomer unit derived from methacrylic acid (methacrylic acid monomer unit).
- the monomer mixture used for the copolymerization of the above-mentioned copolymer is a styrene-based monomer and other monomers copolymerizable with the (meth) acrylic acid-based monomer as long as the effects of the present invention are not impaired. May include. That is, the copolymer may contain monomeric units derived from other monomers. Other monomers include vinyl cyanide monomers such as acrylonitrile and methacrylonitrile, acrylic monomers such as butyl acrylate, ethyl acrylate, methyl acrylate and methyl methacrylate, and ⁇ such as maleic anhydride and fumaric acid.
- the copolymer preferably contains substantially only a styrene-based monomer and a (meth) acrylic acid-based monomer, and more preferably contains only a styrene-based monomer and a (meth) acrylic acid-based monomer.
- the styrene-based monomer unit (in the styrene-based resin (A)) is preferably 99.9 to 40% by mass, and more preferably 85 to 99% by mass. Within such a range, in addition to hue and transparency, moldability and foamability are also excellent.
- the content of the styrene-based monomer unit (a1) is, for example, 40,45,50,55,60,65,70,75,80,85,88,90,92,95,96, It is 99,99.9% by mass, and may be in the range between any two of the numerical values exemplified here.
- the (meth) acrylic acid-based simple substance in the styrene-based resin (A) is preferably 0.1 to 60.0% by mass, more preferably 1 to 20% by mass. Within such a range, in addition to hue and transparency, moldability and foamability are also excellent.
- the content of the (meth) acrylic acid-based monomer unit (a2) is, for example, 0.1,1,4,5,8,10,15,20,25,30,35,40, It is 45, 50, 55, 60% by mass, and may be within the range between any two of the numerical values exemplified here.
- the weight average molecular weight of the styrene resin (A) is preferably 50,000 to 400,000, specifically, for example, 5, 10, 15, 20, 25, 30, 35, 400,000, and is exemplified here. It may be within the range between any two of the given numerical values. Within such a range, the characteristics and moldability of the molded product are improved.
- the weight average molecular weight of the styrene resin (A) depends on the reaction temperature and residence time of the polymerization step, the type and addition amount of the polymerization initiator, the type and addition amount of the chain transfer agent, the type and amount of the solvent used during the polymerization, and the like. Can be controlled.
- the weight average molecular weight was measured by gel permeation chromatography (GPC) under the following conditions.
- GPC model Showa Denko Corporation Shodex GPC-101 Column: Polymer Laboratories PLgel 10 ⁇ m MIXED-B Mobile phase: Tetrahydrofuran Sample concentration: 0.2% by mass Temperature: Oven 40 ° C, injection port 35 ° C, detector 35 ° C Detector: Differential refractometer
- the molecular weight of the present invention is calculated as the molecular weight in terms of polystyrene by calculating the molecular weight at each elution time from the elution curve of monodisperse polystyrene.
- Examples of the polymerization method of the styrene resin include known styrene polymerization methods such as a bulk polymerization method, a solution polymerization method, a suspension polymerization method, and an emulsion polymerization method. In terms of quality and productivity, the bulk polymerization method and the solution polymerization method are preferable, and continuous polymerization is preferable.
- the solvent for example, alkylbenzenes such as benzene, toluene, ethylbenzene and xylene, ketones such as acetone and methyl ethyl ketone, and aliphatic hydrocarbons such as hexane and cyclohexane can be used.
- a polymerization initiator and a chain transfer agent can be used as needed.
- a radical polymerization initiator is preferable, and for example, 1,1-di (t-butylperoxy) cyclohexane, 2,2-di (t-butylperoxy) butane, 2,2-di (t-butylperoxy) butane, which are known and commonly used, are preferable.
- Peroxyketals such as di (4,4-di-t-butylperoxycyclohexyl) propane, 1,1-di (t-amylperoxy) cyclohexane, cumenehydroperoxide, t-butylhydroperoxide and the like.
- alkyl peroxides such as t-butylperoxyacetate, t-amylperoxyisononanoate, t-butylcumyl peroxide, di-t-butyl peroxide, dicumyl peroxide, di-t -Dialkyl peroxides such as hexyl peroxide, peroxyesters such as t-butylperoxyacetate, t-butylperoxybenzoate, t-butylperoxyisopropyl monocarbonate, t-butylperoxyisopropylcarbonate, polyether Peroxycarbonates such as tetrakis (t-butylperoxycarbonate), N, N'-azobis (cyclohexane-1-carbonitrile), N, N'-azobis (2-methylbutyronitrile), N, N' -Azobis (2,4-dimethylvaleronitrile), N, N'-azobis [2- (hydroxymethyl)
- the polymerization reaction is first controlled by adjusting the polymerization temperature, etc. so that the target molecular weight, molecular weight distribution, and reaction conversion rate are obtained by using a completely mixed tank type stirring tank or a column reactor known in the polymerization step. Will be done.
- the polymerization solution containing the polymer that has left the polymerization step is transferred to the devolatile step, and the unreacted monomer and the polymerization solvent are removed.
- the devolatilization process consists of a vacuum devolatilization tank equipped with a heater and a devolatilization extruder with a vent.
- the polymer in the molten state that has left the devolatile step is transferred to the granulation step.
- the molten resin is extruded into a strand shape from a porous die and processed into a pellet shape by a cold cut method, an aerial hot cut method, or an underwater hot cut method.
- Ingredient (B) contains 4-methoxyphenol or hydroquinone.
- the content of the component (B) is 1 ⁇ g or more and less than 16 ⁇ g per 1 g of the styrene resin (A). Within such a range, transparency and hue are excellent.
- the content of the component (B) is, specifically, 1,2,3,4,5,6,7,8,9,10,11,12,13, per 1 g of the styrene resin (A). It is 14, 15, 15.9 ⁇ g, and may be within the range between any two of the numerical values exemplified here.
- the component (B) may be added at the time of polymerization, or may be removed by a known method such as distillation or adsorption removal. Specifically, it is the method described in JP-A-8-310979.
- the content of the component (B) was measured by the following method. After the pellet was sufficiently dissolved in 20 ml of methyl ethyl ketone, 5 ml of methanol was added dropwise, and the mixture was stirred for about 20 minutes. The supernatant separated by centrifugation was measured by gas chromatography (GC). A calibration curve prepared in advance was used for each antioxidant to determine the concentration.
- GC measurement conditions GC device: Shimadzu GC-2010 Column: DB-1 (0.25 mm id ⁇ 30 m) Liquid phase thickness 0.10 mm Column temperature: 240 ° C (holds 1 min) ⁇ (10 ° C / min temperature rise) ⁇ 320 ° C (holds 5 min) 14 min in total Injection port temperature: 320 ° C Injection method: Split method (split ratio 1: 5) Sample volume: 1 ⁇ l
- additives can be added to the styrene resin (A) as needed, as long as the characteristics of the present invention are not impaired.
- the type of additive is not particularly limited as long as it is generally used for plastics, but antioxidants, flame retardants, lubricants, processing aids, antiblocking agents, antistatic agents, deodorants, antibacterial agents, etc. Examples thereof include antifogging agents, light resistance improvers, softeners, plasticizers, inorganic reinforcing agents, cross-linking agents, pigments, dyes, and / or mixtures thereof.
- a molded product made of the above styrene resin composition can be obtained.
- the molded product include an electric product, a household product, a food packaging container and the like processed and molded by an extrusion molded product, an injection molded product, a blow molded product, a sheet molded product, a foam molded product and the like.
- it is a light guide plate, a light guide body such as a light diffusing plate, a film, or the like.
- Effervescent sheets and the like are also used in containers for microwave ovens and the like.
- Example 1 (Preparation of styrene resin composition) By the following steps, pellets made of a styrene-based resin composition containing a styrene-methacrylic acid copolymer were obtained.
- the polymerization process was configured by connecting the first reactor, which is a complete mixing type stirring tank with an internal volume of 39 liters, and the second reactor, which is a completely mixed type stirring tank with an internal volume of 39 liters, in series.
- a raw material solution consisting of a mixed solution of 76% by mass of styrene, 6% by mass of methacrylic acid (4-methoxyphenol concentration 50 ⁇ g / g) and 18% by mass of ethylbenzene was prepared.
- This raw material solution was continuously supplied to the first reactor at a rate of 13.2 kg per hour, and each reactor was distributed in a full state.
- 250 ppm of 1,1-bis (t-butylperoxy) cyclohexane (Perhexa C manufactured by NOF CORPORATION) was added to the total amount of styrene and methacrylic acid in the raw material solution.
- the reaction temperature of each reactor was adjusted to 130 ° C. in the first reactor and 140 ° C. in the second reactor.
- a solution containing the copolymer resin continuously taken out from the second reactor was introduced into a vacuum devolatilization tank equipped with a preheater installed in two stages in series to separate unreacted monomers and ethylbenzene, and then in the form of strands.
- a styrene-based resin composition was obtained by extruding and cooling the mixture and then cutting the pellets into pellets.
- the temperature of the preheater was set to 175 ° C.
- the pressure of the vacuum devolatilization tank was set to 500 mmHg
- the jacket temperature of the vacuum devolatilization tank was set to 185 ° C.
- the temperature of the preheater was set to 240 ° C.
- the pressure of the vacuum devolatilization tank was set to 8 mmHg
- the jacket temperature of the vacuum devolatilization tank was set to 240 ° C.
- the resin temperature in the first-stage vacuum devolatilization tank was 168 ° C.
- the resin temperature in the second-stage vacuum devolatilization tank was 231 ° C.
- the 4-methoxyphenol concentration in the obtained styrene resin composition was 1.2 ⁇ g / g.
- the obtained plate-shaped molded product was cut and polished to 115 ⁇ 127 ⁇ 3 mm using a gate processing machine GCBP-500 manufactured by Megalo Technica Co., Ltd. to obtain a plate-shaped molded product having a mirror surface on the end face.
- the obtained plate-shaped molded product has a wavelength at an optical path length of 115 mm in an incident light having a size of 20 ⁇ 1.6 mm and a spreading angle of 0 ° using an ultraviolet visible spectrophotometer V-670 manufactured by JASCO Corporation.
- the spectral transmittance from 350 nm to 800 nm was measured, and the YI value at a field of view of 2 ° in the C light source was calculated according to JIS K7105.
- the obtained value is YI.
- the transmittance represents an average transmittance having a wavelength of 380 nm to 780 nm for the molded product before the long-term durability test.
- ⁇ YI represents the difference between the YI of the molded product before the long-term durability test and the YI of the molded product after the long-term durability test (Equation 1).
- ⁇ YI (YI of the molded product after the long-term durability test)-(YI of the molded product before the long-term durability test) (Equation 1)
- Example 2 A styrene resin composition was obtained in the same manner as in Example 1 except that the amount of 4-methoxyphenol in the methacrylic acid used was 100 ⁇ g / g. The concentration of 4-methoxyphenol in the obtained styrene resin composition was 2.8 ⁇ g / g.
- Example 3 A styrene resin composition was obtained in the same manner as in Example 1 except that the amount of 4-methoxyphenol in the methacrylic acid used was 140 ⁇ g / g. The concentration of 4-methoxyphenol in the obtained styrene resin composition was 3.8 ⁇ g / g.
- Example 4 A styrene resin composition was obtained in the same manner as in Example 1 except that the amount of 4-methoxyphenol in the methacrylic acid used was 230 ⁇ g / g. The concentration of 4-methoxyphenol in the obtained styrene resin composition was 8.3 ⁇ g / g.
- Example 5 A styrene resin composition was obtained in the same manner as in Example 1 except that the amount of 4-methoxyphenol in the methacrylic acid used was 280 ⁇ g / g. The concentration of 4-methoxyphenol in the obtained styrene resin composition was 11.8 ⁇ g / g.
- Example 6 A styrene-based solution was prepared in the same manner as in Example 1 except that a raw material solution consisting of a mixed solution of 76% by mass of styrene, 7% by mass of methacrylic acid (4-methoxyphenol concentration) and 17% by mass of ethylbenzene was prepared. A resin composition was obtained. The concentration of 4-methoxyphenol in the obtained styrene resin composition was 1.8 ⁇ g / g.
- Example 7 A styrene-based solution was prepared in the same manner as in Example 1 except that a raw material solution consisting of a mixed solution of 74% by mass of styrene, 9% by mass of methacrylic acid (4-methoxyphenol concentration 50 ⁇ g / g) and 17% by mass of ethylbenzene was prepared. A resin composition was obtained. The 4-methoxyphenol concentration in the obtained styrene resin composition was 2.5 ⁇ g / g.
- Example 8 A styrene-based solution was prepared in the same manner as in Example 1 except that a raw material solution consisting of a mixed solution of 74% by mass of styrene, 9% by mass of methacrylic acid (4-methoxyphenol concentration 50 ⁇ g / g) and 17% by mass of ethylbenzene was prepared. A resin composition was obtained. The 4-methoxyphenol concentration in the obtained styrene resin composition was 1.3 ⁇ g / g.
- Example 9 A styrene-based solution was prepared in the same manner as in Example 1 except that a raw material solution consisting of a mixed solution of 33% by mass of styrene, 50% by mass of methacrylic acid (4-methoxyphenol concentration) 50% by mass, and 17% by mass of ethylbenzene was prepared. A resin composition was obtained. The concentration of 4-methoxyphenol in the obtained styrene resin composition was 7.9 ⁇ g / g.
- Example 10 A styrene-based resin composition was prepared in the same manner as in Example 1 except that a raw material solution consisting of a mixed solution of 71% by mass of styrene, 12% by mass of methacrylic acid (hydroquinone concentration 50 ⁇ g / g) and 17% by mass of ethylbenzene was prepared. Got The hydroquinone concentration in the obtained styrene resin composition was 3.8 ⁇ g / g.
- a styrene resin composition was obtained in the same manner as in Example 1 except that the amount of 4-methoxyphenol in the methacrylic acid used was 330 ⁇ g / g.
- the concentration of 4-methoxyphenol in the obtained styrene resin composition was 12.1 ⁇ g / g.
- a styrene resin composition was obtained in the same manner as in Example 9 except that the amount of 4-methoxyphenol in the methacrylic acid used was 500 ⁇ g / g.
- the concentration of 4-methoxyphenol in the obtained styrene resin composition was 18.4 ⁇ g / g.
- a styrene resin composition was obtained in the same manner as in Example 9 except that the amount of 4-methoxyphenol in the methacrylic acid used was 200 ⁇ g / g.
- a styrene-based resin composition was prepared by the same method as in Example 1 except that a raw material solution consisting of a mixed solution of 76% by mass of styrene, 6% by mass of methacrylic acid (hydroquinone concentration 330 ⁇ g / g) and 18% by mass of ethylbenzene was prepared.
- a raw material solution consisting of a mixed solution of 76% by mass of styrene, 6% by mass of methacrylic acid (hydroquinone concentration 330 ⁇ g / g) and 18% by mass of ethylbenzene was prepared.
- Got The hydroquinone concentration in the obtained styrene resin composition was 18.0 ⁇ g / g.
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Abstract
Description
好ましくは、スチレン系単量体単位(a1)及び(メタ)アクリル酸系単量体単位(a2)を含み、前記スチレン系単量体単位(a1)と前記(メタ)アクリル酸系単量体単位(a2)の含有量の合計を100質量%とした場合、前記スチレン系単量体単位(a1)の含有量は、99.9~40質量%であり、前記(メタ)アクリル酸系単量体単位(a2)の含有量は、0.1~60質量%である。
好ましくは、前記(メタ)アクリル酸系単量体単位(a2)は、メタクリル酸単量体単位である。
好ましくは、上記スチレン系樹脂組成物からなる成形品。
好ましくは、上記成形品からなる導光体。
好ましくは、上記スチレン系樹脂組成物からなるフィルム。
好ましくは、上記スチレン系樹脂組成物からなる発泡シート。
好ましくは、上記発泡シートからなる容器。
本発明の一実施形態に係るスチレン系樹脂組成物は、スチレン系樹脂(A)と、成分(B)を含む。
スチレン系樹脂(A)は、スチレン系単量体単位(a1)及び(メタ)アクリル酸系単量体単位(a2)を含む共重合体である。すなわち、スチレン系単量体及び(メタ)アクリル酸系単量体を含む単量体を共重合して得られる共重合体である。
重量平均分子量は、ゲルパーミエイションクロマトグラフィー(GPC)を用いて、次の条件で測定した。
GPC機種:昭和電工株式会社製Shodex GPC-101
カラム:ポリマーラボラトリーズ社製 PLgel 10μm MIXED-B
移動相:テトラヒドロフラン
試料濃度:0.2質量%
温度:オーブン40℃、注入口35℃、検出器35℃
検出器:示差屈折計
本発明の分子量は単分散ポリスチレンの溶出曲線より各溶出時間における分子量を算出し、ポリスチレン換算の分子量として算出したものである。
成分(B)は、4-メトキシフェノール又はヒドロキノンを含む。成分(B)の含有量は、スチレン系樹脂(A)1g当たり1μg以上16μg未満である。このような範囲とすることで、透明性及び色相が優れる。成分(B)の含有量は、スチレン系樹脂(A)1g当たり、具体的には例えば、1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,15.9μgであり、ここで例示した数値の何れか2つの間の範囲内であってもよい。
GC測定条件:
GC装置 :島津製作所 GC-2010
カラム :DB-1(0.25mm i.d.×30m)
液相厚0.10mm
カラム温度 :240°C(1min保持)→
(10°C/min昇温)→
320°C(5min保持) 計14min
注入口温度 :320°C
注入法 :スプリット法(スプリット比1:5)
試料量 :1μl
本発明の一実施形態においては、上記スチレン系樹脂組成物からなる成形品が得られる。成形品としては、例えば、押出成形品、射出成形品、ブロー成形品、シート成型品、発泡成形品等により加工・成形された、電化製品、家庭製品、食品包装容器等が挙げられる。光学用途では、導光板、光拡散板等の導光体、フィルム等である。発泡シート等は、レンジアップ用の容器などにも用いられる。
(スチレン系樹脂組成物の調製)
下記の工程により、スチレン-メタクリル酸共重合体を含むスチレン系樹脂組成物によるペレットを得た。
得られたペレットを用いて、シリンダー温度230℃、金型温度50℃にて射出成形を行い、127×127×3mm厚みの板状成形品を成形した。ここで長期の耐久性を評価するサンプル(長期耐久試験後のサンプル)は、80℃のオーブン内に1000時間保管した。
次に、初期サンプル及び長期耐久試験後のサンプルの板状成形品から115×85×3mm厚みの試験片を切り出し、
得られた板状成形品からメガロテクニカ株式会社製ゲート加工機GCPB-500を用いて115×127×3mmに切削、研磨し、端面に鏡面を有する板状成形品を得た。得られた板状成形品について、日本分光株式会社製の紫外線可視分光光度計V-670を用いて、大きさ20×1.6mm、広がり角度0°の入射光において、光路長115mmでの波長350nm~800nmの分光透過率を測定し、C光源における、視野2°でのYI値をJIS K7105に倣い算出した。得られた値がYIである。また、透過率とは、長期耐久試験前の成形品についての波長380nm~780nmの平均透過率を表す。
ΔYIは、長期耐久試験前の成形品のYIと長期耐久試験後の成形品のYIの差を表す(式1)。
ΔYI=(長期耐久試験後の成形品のYI)-(長期耐久試験前の成形品のYI) (式1)
使用したメタクリル酸中の4-メトキシフェノールが100μg/gであったこと以外は、実施例1と同様の方法で、スチレン系樹脂組成物を得た。得られたスチレン系樹脂組成物中の4-メトキシフェノール濃度は2.8μg/gであった。
[実施例3]
使用したメタクリル酸中の4-メトキシフェノールが140μg/gであったこと以外は、実施例1と同様の方法で、スチレン系樹脂組成物を得た。得られたスチレン系樹脂組成物中の4-メトキシフェノール濃度は3.8μg/gであった。
[実施例4]
使用したメタクリル酸中の4-メトキシフェノールが230μg/gであったこと以外は、実施例1と同様の方法で、スチレン系樹脂組成物を得た。得られたスチレン系樹脂組成物中の4-メトキシフェノール濃度は8.3μg/gであった。
[実施例5]
使用したメタクリル酸中の4-メトキシフェノールが280μg/gであったこと以外は、実施例1と同様の方法で、スチレン系樹脂組成物を得た。得られたスチレン系樹脂組成物中の4-メトキシフェノール濃度は11.8μg/gであった。
[実施例6]
スチレン76質量%、メタクリル酸(4-メトキシフェノール濃度50μg/g)7質量%、エチルベンゼン17質量%の混合溶液からなる原料溶液を作成したこと以外は、実施例1と同様の方法で、スチレン系樹脂組成物を得た。得られたスチレン系樹脂組成物中の4-メトキシフェノール濃度は1.8μg/gであった。
[実施例7]
スチレン74質量%、メタクリル酸(4-メトキシフェノール濃度50μg/g)9質量%、エチルベンゼン17質量%の混合溶液からなる原料溶液を作成したこと以外は、実施例1と同様の方法で、スチレン系樹脂組成物を得た。得られたスチレン系樹脂組成物中の4-メトキシフェノール濃度は2.5μg/gであった。
[実施例8]
スチレン74質量%、メタクリル酸(4-メトキシフェノール濃度50μg/g)9質量%、エチルベンゼン17質量%の混合溶液からなる原料溶液を作成したこと以外は、実施例1と同様の方法で、スチレン系樹脂組成物を得た。得られたスチレン系樹脂組成物中の4-メトキシフェノール濃度は1.3μg/gであった。
[実施例9]
スチレン33質量%、メタクリル酸(4-メトキシフェノール濃度50μg/g)50質量%、エチルベンゼン17質量%の混合溶液からなる原料溶液を作成したこと以外は、実施例1と同様の方法で、スチレン系樹脂組成物を得た。得られたスチレン系樹脂組成物中の4-メトキシフェノール濃度は7.9μg/gであった。
[実施例10]
スチレン71質量%、メタクリル酸(ヒドロキノン濃度50μg/g)12質量%、エチルベンゼン17質量%の混合溶液からなる原料溶液を作成したこと以外は、実施例1と同様の方法で、スチレン系樹脂組成物を得た。得られたスチレン系樹脂組成物中のヒドロキノン濃度は3.8μg/gであった。
[比較例1]
使用したメタクリル酸中の4-メトキシフェノールが330μg/gであったこと以外は、実施例1と同様の方法で、スチレン系樹脂組成物を得た。得られたスチレン系樹脂組成物中の4-メトキシフェノール濃度は12.1μg/gであった。
[比較例2]
使用したメタクリル酸中の4-メトキシフェノールが500μg/gであったこと以外は、実施例9と同様の方法で、スチレン系樹脂組成物を得た。得られたスチレン系樹脂組成物中の4-メトキシフェノール濃度は18.4μg/gであった。
[比較例3]
使用したメタクリル酸中の4-メトキシフェノールが200μg/gであったこと以外は、実施例9と同様の方法で、スチレン系樹脂組成物を得た。得られたスチレン系樹脂組成物中の4-メトキシフェノール濃度は21.1μg/gであった。
[比較例4]
スチレン76質量%、メタクリル酸(ヒドロキノン濃度330μg/g)6質量%、エチルベンゼン18質量%の混合溶液からなる原料溶液を作成したこと以外は、実施例1と同様の方法で、スチレン系樹脂組成物を得た。得られたスチレン系樹脂組成物中のヒドロキノン濃度は18.0μg/gであった。
Claims (8)
- スチレン系樹脂(A)と、成分(B)を含み、
前記スチレン系樹脂(A)は、スチレン系単量体単位(a1)及び(メタ)アクリル酸系単量体単位(a2)を含む共重合体であり、
前記成分(B)は、4-メトキシフェノール又はヒドロキノンを含み、
前記成分(B)の含有量が、前記スチレン系樹脂(A)1g当たり1μg以上16μg未満である、
スチレン系樹脂組成物。 - 前記スチレン系樹脂(A)は、スチレン系単量体単位(a1)及び(メタ)アクリル酸系単量体単位(a2)を含み、
前記スチレン系単量体単位(a1)と前記(メタ)アクリル酸系単量体単位(a2)の含有量の合計を100質量%とした場合、
前記スチレン系単量体単位(a1)の含有量は、99.9~40質量%であり、
前記(メタ)アクリル酸系単量体単位(a2)の含有量は、0.1~60質量%である、
請求項1に記載のスチレン系樹脂組成物。 - 前記(メタ)アクリル酸系単量体単位(a2)は、メタクリル酸単量体単位である、請求項1又は請求項2に記載のスチレン系樹脂組成物。
- 請求項1~請求項3の何れか1項に記載のスチレン系樹脂組成物からなる成形品。
- 請求項4に記載の成形品からなる導光体。
- 請求項1~請求項3の何れか1項に記載のスチレン系樹脂組成物からなるフィルム。
- 請求項1~請求項3の何れか1項に記載のスチレン系樹脂組成物からなる発泡シート。
- 請求項7に記載の発泡シートからなる容器。
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