WO2013094641A1 - Composition de résine optique à base de styrène - Google Patents

Composition de résine optique à base de styrène Download PDF

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Publication number
WO2013094641A1
WO2013094641A1 PCT/JP2012/082940 JP2012082940W WO2013094641A1 WO 2013094641 A1 WO2013094641 A1 WO 2013094641A1 JP 2012082940 W JP2012082940 W JP 2012082940W WO 2013094641 A1 WO2013094641 A1 WO 2013094641A1
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resin composition
mass
styrene
polyoxyethylene
content
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PCT/JP2012/082940
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English (en)
Japanese (ja)
Inventor
広平 西野
秀隆 藤松
雅史 塚田
佐藤　誠
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東洋スチレン株式会社
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Application filed by 東洋スチレン株式会社 filed Critical 東洋スチレン株式会社
Priority to KR1020197019413A priority Critical patent/KR102087769B1/ko
Priority to JP2013550305A priority patent/JP6035249B2/ja
Priority to CN201280061401.7A priority patent/CN103998514B/zh
Priority to KR1020147019808A priority patent/KR101998748B1/ko
Priority to KR1020197019425A priority patent/KR102087770B1/ko
Publication of WO2013094641A1 publication Critical patent/WO2013094641A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—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
    • 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
    • C08K5/05—Alcohols; Metal alcoholates
    • C08K5/053—Polyhydroxylic alcohols
    • 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
    • C08K5/134—Phenols containing ester groups
    • C08K5/1345—Carboxylic esters of phenolcarboxylic acids
    • 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
    • C08K5/15—Heterocyclic compounds having oxygen in the ring
    • C08K5/156—Heterocyclic compounds having oxygen in the ring having two oxygen atoms in the ring
    • C08K5/1575—Six-membered rings
    • 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
    • C08K5/49—Phosphorus-containing compounds
    • C08K5/51—Phosphorus bound to oxygen
    • C08K5/52—Phosphorus bound to oxygen only
    • C08K5/524—Esters of phosphorous acids, e.g. of H3PO3
    • C08K5/526—Esters of phosphorous acids, e.g. of H3PO3 with hydroxyaryl compounds
    • 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
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/10—Homopolymers or copolymers of methacrylic acid esters
    • C08L33/12—Homopolymers or copolymers of methyl methacrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
    • C08L71/02—Polyalkylene oxides
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065—Manufacturing aspects; Material aspects
    • 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
    • C08K5/49—Phosphorus-containing compounds
    • 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
    • C08K5/49—Phosphorus-containing compounds
    • C08K5/51—Phosphorus bound to oxygen
    • C08K5/52—Phosphorus bound to oxygen only
    • C08K5/527—Cyclic esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/10—Transparent films; Clear coatings; Transparent materials

Definitions

  • the present invention relates to a transparent styrenic resin composition in which whitening due to environmental changes is suppressed.
  • Styrenic resins have excellent properties such as transparency, rigidity, low water absorption, and dimensional stability, and are excellent in molding processability. Therefore, various types of molding methods such as injection molding, extrusion molding, blow molding, etc. Widely used as industrial materials, food packaging containers, miscellaneous goods and the like. Moreover, it is used also for optical members, such as a light-guide plate, as an application using transparency.
  • the light guide plate is incorporated in the edge-light type backlight and plays the role of guiding the light from the side to the liquid crystal panel, and is used in a wide range of applications such as televisions, desktop personal computer monitors, notebook personal computers, mobile phones, car navigation systems.
  • the An acrylic resin typified by PMMA (polymethylmethacrylate) is used for the light guide plate.
  • PMMA polymethylmethacrylate
  • Patent Document 1 has been proposed as an improvement technique of MS resin such as water absorption and reduction of discoloration during molding.
  • Patent Document 1 discloses a light guide plate having a weight average molecular weight (Mw) of styrene- (meth) acrylate copolymer resin of 60 to 170,000, a residual monomer amount of 3000 ppm or less, and an oligomer amount of 2% or less.
  • Mw weight average molecular weight
  • the water-absorbing property and the dimensional stability tend to be worse than those of the styrene resin using a styrene monomer as a raw material.
  • Non-Patent Document 1 a styrene resin using a styrene monomer as a raw material has low water absorption, the styrene resin has a problem that a molded product becomes cloudy due to environmental changes such as temperature, humidity, and warm water immersion (Non-Patent Document 1). There is a whitening phenomenon), and the transparency, which is an advantage, may be impaired depending on the application. Specifically, when a molded product was exposed to an environmental change from a high-temperature and high-humidity environment to a room temperature environment or an environment change from a room temperature environment to a low-temperature environment, it was uniformly present in the styrene resin.
  • An object of the present invention is to provide a transparent styrenic resin composition in which whitening due to environmental changes is suppressed.
  • a styrene resin composition containing a styrene resin having a weight average molecular weight of 150,000 to 700,000 and a hydrophilic additive, wherein the hydrophilic additive has an average added mole number of ethylene oxide.
  • the hydrophilic additive has an average added mole number of ethylene oxide.
  • the content of the styrene resin composition for optical use is 0.4 to 2.0% by mass.
  • the inventors of the present invention have intensively studied to suppress the whitening phenomenon due to environmental changes, and have found that the addition of a hydrophilic additive is effective in suppressing the whitening phenomenon.
  • further investigations have revealed that simply adding a hydrophilic additive may not work. Therefore, when further investigation was made, (1) the hydrophilic additive has a characteristic configuration, (2) its HLB value is within a specific range, and (3) its content is When the amount is in a specific range, the heat resistance of the styrene resin composition is maintained, and the whitening phenomenon suppressing effect is extremely high, and the transparency of the styrene resin is not impaired. It was.
  • the operational effect for obtaining such an effect is not necessarily clarified, it is considered to be due to the synergistic effect of these three conditions because it is exhibited effectively only when the above three conditions are met.
  • the hydrophilic additive is a polyoxyethylene surfactant having an average addition mole number of ethylene oxide of 10 to 60, and the content in 100% by mass of the styrene resin composition is 0.00. 6 to 1.4% by mass.
  • the hydrophilic additive is a polyoxyethylene type surfactant having an average addition mole number of ethylene oxide of 13 to 35, and the content in 100% by mass of the styrene resin composition is 0.00. It is 6 to 0.9% by mass.
  • the hydrophilic additive has an HLB value of 10-18.
  • the polyoxyethylene type surfactant is a polyoxyethylene type nonionic surfactant.
  • the polyoxyethylene type nonionic surfactant is selected from the group of polyoxyethylene alkyl ether represented by the following general formula (1) and / or polyoxyethylene fatty acid ester represented by the following general formula (2).
  • R represents an alkyl group having 8 to 20 carbon atoms.
  • the hydrophilic additive is polyethylene glycol having an average molecular weight of 200 to 10,000, and the content in 100% by mass of the styrenic resin composition is 0.6 to 1.4% by mass.
  • the hydrophilic additive is polyethylene glycol having an average molecular weight of 200 to 1800.
  • the hydrophilic additive has a content of 0.6 to 0.9% by mass in 100% by mass of the styrene resin composition.
  • the styrene resin is a styrene- (meth) acrylic acid copolymer resin obtained by copolymerizing a styrene monomer and (meth) acrylic acid, and the styrene resin is a styrene resin.
  • the unit content is 90.0 to 99.9% by mass, and the (meth) acrylic acid unit content is 0.1 to 10.0% by mass.
  • the total content of styrene monomer units and (meth) acrylic acid units in the styrene resin is 100% by mass.
  • the styrenic resin is a styrene- (meth) acrylic acid ester copolymer resin obtained by copolymerizing a styrene monomer and a (meth) acrylic acid ester.
  • the content of the monomer unit is 40.0 to 99.0% by mass, and the content of the (meth) acrylate unit is 1.0 to 60.0% by mass.
  • the total content of styrene monomer units and (meth) acrylic acid ester units in the styrene resin is 100% by mass.
  • the styrenic resin composition of the present invention has low water absorption and is inexpensive compared to PMMA and MS resins, and does not cause whitening due to environmental changes, which is a drawback of styrenic resins, and is excellent in colorless transparency. Therefore, it can be suitably used for applications utilizing the original transparency of the styrene resin.
  • the styrene resin of the present invention can be obtained by polymerizing a styrene monomer.
  • the styrene monomer is an aromatic vinyl monomer, such as styrene, ⁇ -methyl styrene, o-methyl styrene, p-methyl styrene, or a mixture of two or more, preferably styrene.
  • acrylic acid monomers such as acrylic acid and methacrylic acid
  • vinyl cyanide monomers such as acrylonitrile and methacrylonitrile
  • butyl acrylate Acrylic monomers such as ethyl acrylate, methyl acrylate, and methyl methacrylate
  • ⁇ , ⁇ -ethylenically unsaturated carboxylic acids such as maleic anhydride and fumaric acid
  • imide monomers such as phenyl maleimide and cyclohexyl maleimide.
  • the styrene resin composition is preferably composed of a styrene resin and various additives.
  • the ratio of the styrene resin in 100% by mass of the styrene resin composition is, for example, 90 to 99.6% by mass. It is preferably 95 to 99.6% by mass.
  • the ratio of the styrenic resin is, for example, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 99.6% by mass, and any of the numerical values exemplified here is 2 It may be within a range between the two.
  • the styrene resin is a styrene- (meth) acrylic acid copolymer resin obtained by copolymerizing a styrene monomer and (meth) acrylic acid
  • the content of the styrene resin unit of the styrene resin The amount is preferably 90.0 to 99.9% by mass, and the content of (meth) acrylic acid units is preferably 0.1 to 10.0% by mass.
  • the total content of styrene monomer units and (meth) acrylic acid units is 100% by mass.
  • (Meth) acrylic acid is acrylic acid, methacrylic acid or the like, with methacrylic acid being preferred.
  • the content of the (meth) acrylic acid unit in the styrenic resin can be adjusted by the composition ratio of the raw styrene monomer and the (meth) acrylic acid monomer during the polymerization of the styrene resin.
  • a styrene resin containing a (meth) acrylic acid unit and a styrene resin not containing a (meth) acrylic acid unit can be blended and adjusted.
  • the styrene resin is a styrene- (meth) acrylate copolymer resin obtained by copolymerizing a styrene monomer and a (meth) acrylate ester
  • a styrene monomer unit of the styrene resin The content of is preferably 40.0 to 99.0% by mass, and the content of (meth) acrylic acid ester units is preferably 1.0 to 60.0% by mass. However, the total content of the styrene monomer unit and the (meth) acrylate unit is 100% by mass.
  • the (meth) acrylic acid ester is a methacrylic acid ester such as methyl methacrylate or ethyl methacrylate, or an acrylic acid ester such as methyl acrylate or ethyl acrylate.
  • the content of the (meth) acrylic acid ester unit in the styrene resin can be measured under the following conditions by pyrolysis gas chromatography.
  • Pyrolysis furnace PYR-2A (manufactured by Shimadzu Corporation) Pyrolysis furnace temperature setting: 525 ° C
  • Gas chromatograph GC-14A (manufactured by Shimadzu Corporation) Column: Glass 3mm diameter x 3m Filler: FFAP Chromsorb WAW 10% Injection, detector temperature: 250 ° C Column temperature: 120 ° C Carrier gas: Nitrogen
  • 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, bulk polymerization and solution polymerization are preferable, and continuous polymerization is preferable.
  • Examples of the solvent include alkylbenzenes such as benzene, toluene, ethylbenzene and xylene, ketones such as acetone and methyl ethyl ketone, and aliphatic hydrocarbons such as hexane and cyclohexane.
  • a polymerization initiator and a chain transfer agent can be used as needed during the polymerization of the styrene resin.
  • a radical polymerization initiator is preferable.
  • 1,1-di (t-butylperoxy) cyclohexane, 2,2-di (t-butylperoxy) butane, 2,2- Peroxyketals such as di (4,4-di-t-butylperoxycyclohexyl) propane, 1,1-di (t-amylperoxy) cyclohexane, cumene hydroperoxide, t-butyl hydroperoxide, etc.
  • Alkyl peroxides such as hydroperoxides, t-butylperoxyacetate, t-amylperoxyisononanoate, t-butylcumyl peroxide, di-t-butylperoxide, dicumylperoxide, di-t -Dialkyl peroxides such as hexyl peroxide, t-butylperoxyacetate Peroxyesters such as t-butyl peroxybenzoate and t-butylperoxyisopropyl monocarbonate, peroxycarbonates such as t-butyl peroxyisopropyl carbonate and polyether tetrakis (t-butyl peroxycarbonate) 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 to achieve the target molecular weight, molecular weight distribution, and reaction conversion rate using a well-known complete mixing tank type stirring tank or tower reactor in the polymerization process. Is done.
  • the polymerization solution containing the polymer exiting the polymerization step is transferred to the devolatilization step, and unreacted monomers and polymerization solvent are removed.
  • the devolatilization process includes a vacuum devolatilization tank with a heater, a vented devolatilization extruder, and the like.
  • the polymer in the molten state that has exited the devolatilization step is transferred to the granulation step.
  • the molten resin is extruded in a strand form from a porous die and processed into a pellet shape by a cold cut method, an air hot cut method, or an underwater hot cut method.
  • the styrene resin of the present invention has a weight average molecular weight of 150,000 to 700,000, preferably 180,000 to 500,000. If it is less than 150,000, the strength of the molded product becomes insufficient, and if it exceeds 700,000, the moldability is remarkably lowered.
  • the weight average molecular weight of the styrenic resin should be controlled by the reaction temperature of the polymerization process, the residence time, the type and amount of polymerization initiator, the type and amount of chain transfer agent, the type and amount of solvent used during polymerization, etc. Can do.
  • the weight average molecular weight (Mw), the Z average molecular weight (Mz), and the number average molecular weight (Mn) were measured using gel permeation chromatography (GPC) under the following conditions.
  • GPC model Shodex GPC-101 manufactured by Showa Denko KK Column: PLgel 10 ⁇ m MIXED-B manufactured by Polymer Laboratories
  • Mobile phase Tetrahydrofuran Sample concentration: 0.2% by mass
  • Temperature 40 ° C oven, 35 ° C inlet, 35 ° C detector
  • 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.
  • the hydrophilic additive is a compound having a hydrophilic group capable of interacting with water (hydrogen bonding).
  • the hydrophilic group is preferably a polyether chain.
  • the polyether chain is a skeleton structure in which ether bonds are linked.
  • EO ethylene oxide
  • a polyglycerol chain synthesized by dehydration condensation of a polyoxypropylene chain, a polyoxybutylene chain or glycerin can be mentioned, and a polyoxyethylene chain is preferable.
  • the polyether chain may have not only one set per molecule but also a plurality of sets.
  • a polyoxyethylene surfactant having an average added mole number of ethylene oxide of 3 to 150 and a polyethylene glycol having an average molecular weight of 200 to 10,000 are selected. Add at least one. This is because it has been experimentally found that it is essential to use a hydrophilic additive having such a specific configuration in order to enhance the effect of suppressing the whitening phenomenon.
  • the HLB value of the hydrophilic additive is 5 to 20. This is because it has been experimentally found that it is essential to use a hydrophilic additive having such a specific HLB value in order to enhance the whitening phenomenon suppressing effect.
  • the HLB value is preferably 8 to 20, more preferably 10 to 20, and more preferably 10 to 18.
  • HLB (Hydrophilic-lipophilic balance) value is a value that represents the hydrophilicity of the additive. When the HLB value is 8-10, it is stably dispersed in water, and when it exceeds 10, it completely dissolves transparently from a transparent dispersion state. It becomes a state to do.
  • the HLB value (molecular weight of hydrophilic group part) / (molecular weight of additive) ⁇ 20.
  • the hydrophilic additive is added so that the content in 100% by mass of the styrene resin composition is 0.4 to 2.0% by mass. This is because it has been experimentally found that it is essential to add such a content in order to increase the whitening phenomenon suppressing effect while maintaining the heat resistance of the styrene-based resin composition.
  • the content of the hydrophilic additive in 100% by mass of the styrenic resin composition is preferably 0.7 to 1.6% by mass or 0.6 to 1.4% by mass, and more preferably 0.6%. Is 0.9 mass%.
  • the heating loss of the hydrophilic additive at 200 ° C. in a nitrogen atmosphere is 10% by mass or less.
  • Heat loss in a nitrogen atmosphere at a temperature of 200 ° C. can be determined by thermogravimetric analysis (TGA). Heating is performed at a temperature increase rate of 10 ° C./min from a room temperature in a nitrogen atmosphere, and the weight loss at a temperature of 200 ° C. It can be determined from the quantity.
  • An additive having a temperature loss of 200 ° C. and a heating loss of more than 10% by mass in a nitrogen atmosphere has high volatility, and gas is generated during the molding process of the styrene-based resin, which may cause mold or roll contamination.
  • a method for adding a hydrophilic additive a method of adding and mixing in a polymerization process of a styrene resin, a devolatilization process, a granulation process, a method of adding and mixing with an extruder or the like at the time of molding, a high concentration of hydrophilic additive
  • a method of diluting and mixing the resin composition adjusted to the desired content with an additive-free styrenic resin can be mentioned, and is not particularly limited.
  • a styrene resin composition containing 0.5 to 50.0% by mass of a hydrophilic additive and an additive-free styrene resin are mixed using an extruder or an injection molding machine to obtain a styrene resin having a desired concentration.
  • the method include obtaining a resin composition, a molded product, and a light guide plate.
  • Polyoxyethylene type surfactants include polyoxyethylene type nonionic surfactants, polyoxyethylene type anionic surfactants, polyoxyethylene type cationic surfactants, polyoxyethylene type amphoteric surfactants And a polyoxyethylene type nonionic surfactant is preferable.
  • Polyoxyethylene type nonionic surfactants include polyoxyethylene alkyl ether represented by the following general formula (1), polyoxyethylene fatty acid ester represented by the following general formula (2), polyoxyethylene hydrogenated castor oil, polyoxy Ethylene sorbitan fatty acid ester and polyoxyethylene sorbitol fatty acid ester are exemplified, but one or more selected from the group of polyoxyethylene alkyl ether and / or polyoxyethylene fatty acid ester are preferable.
  • polyvalent polyoxyethylene alkyl ethers having a plurality of polyoxyethylene alkyl ether skeletons in one molecule and polyvalent polyoxyethylene fatty acid esters having a plurality of polyoxyethylene fatty acid ester skeletons in one molecule are used.
  • the valence of polyoxyethylene alkyl ether or polyoxyethylene fatty acid ester means the number of polyoxyethylene alkyl ether skeleton or polyoxyethylene fatty acid ester skeleton present in one molecule.
  • R represents an alkyl group having 8 to 20 carbon atoms.
  • a polyvalent polyoxyethylene alkyl ether up to hexavalent having a plurality of polyoxyethylene alkyl ether skeletons, and a plurality of polyoxyethylene fatty acid ester skeletons.
  • It may be a polyvalent polyoxyethylene fatty acid ester having up to 6 valences, where n is an integer and represents the number of added moles of ethylene oxide units.
  • Polyoxyethylene alkyl ether is made by adding ethylene oxide to alcohol
  • polyoxyethylene fatty acid ester is made by adding ethylene oxide to fatty acid or directly esterifying fatty acid and polyethylene glycol.
  • the number is 3 to 150. This is because it has been experimentally found that it is essential that the average added mole number is within such a specific range in order to enhance the whitening phenomenon suppressing effect.
  • the average added mole number is preferably 7 to 100, more preferably 10 to 60, still more preferably 10 to 50, and further preferably 13 to 35.
  • polyoxyethylene surfactant of the present invention examples include, for example, polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene octyl decyl ether, polyoxyethylene myristyl ether Polyoxyethylene alkyl ethers such as polyoxyethylene 2-ethylhexyl ether, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan fatty acid esters such as polyoxyethylene sorbitan tristearate, polyoxyethylene sorbite tetraoleate, etc.
  • Oxyethylene sorbitol fatty acid ester polyethylene glycol monolaurate, polyethylene glycol monostearate, polyethylene Polyoxyethylene fatty acid esters such as glycol distearate, polyethylene glycol monooleate, polyoxyethylene hydrogenated castor oil, polyoxyethylene monomethyl ether, polyoxyethylene dimethyl ether, polyoxyethylene glyceryl ether, polyoxyethylene tetraoleic acid, poly Examples thereof include oxyethylene triisostearic acid and polyoxyethylene coconut fatty acid glyceryl.
  • the average molecular weight of polyethylene glycol used in the present invention is 200 to 10,000. 200 to 4000 is preferable, 200 to 1800 is more preferable, and 300 to 1000 is more preferable. If the average molecular weight of polyethylene glycol is less than 200, gas is generated during the molding process, and the mold and roll are soiled, which is not preferable. In addition, if it exceeds 10,000, the effect of preventing the whitening phenomenon tends to be reduced, and the compatibility with the styrene resin is reduced, and the styrene resin composition and the molded product thereof may become cloudy.
  • the average molecular weight is calculated from the hydroxyl group concentration (based on JIS K1557) measured by the pyridine phthalic anhydride method.
  • the styrenic resin composition of the present invention may contain mineral oil as long as the colorless transparency of the present invention is not impaired.
  • internal lubricants such as stearic acid and ethylenebisstearic acid amide, hindered phenol antioxidants, phosphorus antioxidants, sulfur antioxidants, lactone antioxidants, hindered amine stabilizers, UV absorbers
  • additives such as an antistatic agent may be contained.
  • the external lubricant ethylene bis stearamide is preferable, and the content is preferably 30 to 200 ppm in the resin composition.
  • the styrenic resin composition of the present invention is suitable for optical applications as a field utilizing transparency, for example, an optical material, because the deterioration of optical properties such as transmittance, hue, and transparency, which are characteristics of the styrene resin, is small. Can be used.
  • optical applications include lenses, light guide plates, films, optical fibers, and optical waveguides.
  • the styrenic resin composition of the present invention contains (c) 6- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propoxy] -2,4,8,10-tetra-tert-butyl.
  • Dibenzo [d, f] [1,3,2] dioxaphosphine hereinafter referred to as “compound X”
  • compound X Dibenzo [d, f] [1,3,2] dioxaphosphine
  • compound X dibenzo [d, f] [1,3,2] dioxaphosphine
  • phosphorus antioxidant phosphorus antioxidant
  • e hindered phenol antioxidant
  • Long-term thermal stability represents changes in hue and transmittance due to heat in long-term use, and those having excellent thermal stability have small changes in hue and transmittance.
  • the long-term thermal stability can be evaluated as an accelerated test by storing the molded product under a high temperature condition (60 to 90 ° C.) that does not cause deformation of the resin, and changing the hue and transmittance over time.
  • Compound X is a processing stabilizer having a hindered phenol antioxidant skeleton and a phosphorus antioxidant skeleton in the same molecule.
  • the content of compound X in 100% by mass of the styrene resin composition is preferably 0.02 to 0.40% by mass, and more preferably 0.05 to 0.20% by mass. If the content of the compound X is less than 0.02% by mass, the long-term thermal stability is inferior, and the initial hue and transmittance are also inferior. Moreover, even if it exceeds 0.40 mass%, long-term thermal stability will deteriorate. Long-term thermal stability represents changes in hue and transmittance due to heat in long-term use, and those having excellent thermal stability have small changes in hue and transmittance.
  • the long-term thermal stability can be evaluated as an accelerated test by storing the molded product under a high temperature condition (60 to 90 ° C.) that does not cause deformation of the resin, and changing the hue and transmittance over time.
  • the content of the compound X in 100% by mass of the styrene resin composition is, for example, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08. 0.09, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40 mass%, and the range between any two of the numerical values exemplified here It may be within.
  • long-term thermal stability can be imparted, and long-term thermal stability can also be achieved by adding phosphorus-based antioxidants and / or hindered phenol-based antioxidants. Can be granted.
  • the phosphorus-based antioxidant is preferably contained in an amount of 0.02 to 0.50% by mass, more preferably 0.05 to 0.40% by mass in 100% by mass of the styrene resin composition, and 0.05 to More preferably, the content is 0.30% by mass. If it is less than 0.02% by mass, the long-term thermal stability is poor, and the initial hue and transmittance are also poor. Even if it exceeds 0.50 mass%, long-term thermal stability will deteriorate.
  • the content of the phosphorus antioxidant in 100% by mass of the styrene resin composition is, for example, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50 mass%, where It may be within a range between any two of the exemplified numerical values.
  • the hindered phenolic antioxidant is preferably contained in an amount of 0.02 to 0.50% by mass, more preferably 0.02 to 0.30% by mass in 100% by mass of the styrene resin composition. More preferably, the content is from 05 to 0.30% by mass. If it is less than 0.02% by mass, the long-term thermal stability is poor, and the initial hue and transmittance are also poor. Even if it exceeds 0.50 mass%, long-term thermal stability will deteriorate.
  • the content of the hindered phenol-based antioxidant in 100% by mass of the styrene-based resin composition is, for example, 0.02, 0.03, 0.04, 0.05, 0.06, 0.0. 07, 0.08, 0.09, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50% by mass, It may be within a range between any two of the numerical values exemplified here.
  • Phosphorous antioxidants are phosphites that are trivalent phosphorus compounds.
  • Phosphorus antioxidants include, for example, tris (2,4-di-tert-butylphenyl) phosphite, 2,2′-methylenebis (4,6-di-tert-butyl-1-phenyloxy) (2- Ethylhexyloxy) phosphorus, bis (2,4-dicumylphenyl) pentaerythritol diphosphite, 4,4′-biphenylenediphosphinic acid tetrakis (2,4-di-tert-butylphenyl), 3,9-bis (2 , 6-Di-tert-butyl-4-methylphenoxy) -2,4,8,10-tetraoxa-3,9-diphosphaspiro [5.5] undecane, cyclic neopentanetetraylbis (2,4-di -T-butylphenyl pho
  • phosphorus-based antioxidant those excellent in hydrolysis resistance are preferable, such as tris (2,4-di-tert-butylphenyl) phosphite, 2,2′-methylenebis (4,6-di-tert-). Butyl-1-phenyloxy) (2-ethylhexyloxy) phosphorus, bis (2,4-dicumylphenyl) pentaerythritol diphosphite, 3,9-bis (2,6-di-tert-butyl-4-methyl) Phenoxy) -2,4,8,10-tetraoxa-3,9-diphosphaspiro [5.5] undecane is preferred. Particularly preferred is tris (2,4-di-tert-butylphenyl) phosphite. Phosphorous antioxidants may be used alone or in combination of two or more.
  • the hindered phenol antioxidant is an antioxidant having a phenolic hydroxyl group in the basic skeleton.
  • hindered phenol antioxidants include octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, 3,9-bis [2- [3- (3-tert-butyl).
  • octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate 3,9-bis [2- [3- (3-tert-butyl-4-hydroxy-5-methyl) Phenyl) propionyloxy] -1,1-dimethylethyl] -2,4,8,10-tetraoxaspiro [5.5] undecane, ethylenebis (oxyethylene) bis [3- (5-tert-butyl-4 -Hydroxy-m-tolyl) propionate].
  • Hindered phenolic antioxidants may be used alone or in combination of two or more.
  • Compound X can be added by adding and mixing in the polymerization process, devolatilization process and granulation process of styrene resin, and extruders and injections during molding.
  • the ultraviolet absorber has a function of suppressing deterioration and coloring due to ultraviolet rays.
  • benzophenone, benzotriazole, triazine, benzoate, salicylate, cyanoacrylate, oxalic anilide, malonic ester UV absorbers such as those of formaldehyde and formamidine. These can be used alone or in combination of two or more thereof, and a light stabilizer such as hindered amine may be used in combination.
  • the styrenic resin composition of the present invention can obtain a molded product by various molding methods according to purposes such as injection molding, extrusion molding, blow molding, compression molding and the like.
  • the shape of the molded product can be a shape according to the purpose, and is not limited. For example, if it is a plate-shaped molded article, it can be used as a light guide plate.
  • As a method of forming a light guide plate it is known to provide a reflection pattern such as a dot pattern on the back surface of the plate-shaped molded product (opposite the surface from which light is emitted).
  • a prism pattern can be provided on the surface (surface from which light is emitted) of the plate-shaped molded product.
  • the pattern on the front surface or the back surface of the plate-shaped molded product can be formed at the time of molding the plate-shaped molded product.
  • the pattern can be formed by a mold shape in injection molding or roll transfer in extrusion molding.
  • the Vicat softening temperature of the styrene resin composition of the present invention is preferably 95 to 104 ° C, more preferably 97 to 104 ° C. If the Vicat softening temperature is less than 95 ° C., the heat resistance is insufficient, and the molded product may be deformed depending on the use environment.
  • the haze of the styrenic resin composition of the present invention is a molded product having a thickness of 4 mm, preferably 5% or less, and more preferably 1% or less.
  • the polymerization reactor is configured by connecting a first reactor, which is a complete mixing tank, a second reactor, and a third reactor, which is a plug flow reactor with a static mixer.
  • the styrene resin was manufactured by the above.
  • the capacity of each reactor was 39 liters for the first reactor, 39 liters for the second reactor, and 16 liters for the third reactor.
  • a raw material solution was prepared with the raw material composition described in Table 1, and the raw material solution was continuously supplied to the first reactor at a flow rate described in Table 1.
  • the polymerization initiator was added to the raw material solution at the inlet of the first reactor so that the addition concentration shown in Table 1 (concentration based on mass with respect to the total amount of raw styrene and methacrylic acid) was mixed.
  • the polymerization initiators listed in Table 1 are as follows: Polymerization initiator-1: 2,2-di (4,4-t-butylperoxycyclohexyl) propane (Pertetra A manufactured by NOF Corporation was used).
  • Polymerization initiator-2 1,1-di (t-butylperoxy) cyclohexane (Perhexa C manufactured by NOF Corporation was used.)
  • a temperature gradient was provided along the flow direction, and the temperature in Table 1 was adjusted at the intermediate part and the outlet part. Subsequently, the solution containing the polymer continuously taken out from the third reactor was introduced into a vacuum devolatilization tank with a preheater constituted by two stages in series, and the preheater was adjusted to the resin temperature shown in Table 1.
  • Examples 1-1 to 1-33, Comparative Examples 1-1 to 1-9 With the contents shown in Table 2, styrene resins A-1 to A-3 and additives were melt-kneaded using a single screw extruder with a screw diameter of 40 mm at a cylinder temperature of 230 ° C. and a screw rotation speed of 100 rpm. Pellets were obtained.
  • the additives used in Table 2 are shown below.
  • B-5: Polyoxyethylene ethylene lauryl ether Average addition mole number of ethylene oxide 30 (Emulgen 130K manufactured by Kao Corporation)
  • Example 1-33 styrene resin A-1 and additive B-1 were melt kneaded using a single screw extruder with a screw diameter of 40 mm at a cylinder temperature of 230 ° C. and a screw rotation speed of 100 rpm, and then added.
  • This is a molded product obtained by once obtaining pellets having a concentration of 20% by mass of agent B-1 and then mixing the pellets and styrene resin A-1 in a ratio of 1:24, followed by injection molding. .
  • MFR melt mass flow rate
  • ⁇ Early hue evaluation> A test piece having a thickness of 115 ⁇ 85 ⁇ 3 mm was cut out from the obtained plate-shaped product, and the end surface was polished by buffing to obtain a plate-shaped product having a mirror surface on the end surface.
  • the obtained plate-like molded product was measured using an ultraviolet-visible spectrophotometer V-670 manufactured by JASCO Corporation, with an incident light having a size of 20 ⁇ 1.6 mm and a spread angle of 0 °, and a wavelength at an optical path length of 115 mm.
  • Spectral transmittances from 350 nm to 800 nm were measured, and the YI value with a C light source at a visual field of 2 ° was calculated according to JIS K7105.
  • the obtained value is “YI 115 mm” in Table 2.
  • “Transmittance 115 mm” shown in Table 2 represents an average transmittance at a wavelength of 380 nm to 780 nm.
  • “Haze 4 mm” in Table 2 is a plate-shaped molded article having a thickness of 55 ⁇ 50 ⁇ 4 mm by performing injection molding at a cylinder temperature of 220 ° C. and a mold temperature of 40 ° C. using the pellets obtained in the above process.
  • Is a value obtained by performing measurement in accordance with JIS K-7105 using NDH5000 (manufactured by Nippon Denshoku Industries Co., Ltd.) using a test piece obtained by molding YY 4 mm in Table 2.
  • ⁇ Whitening suppression effect> Furthermore, in order to confirm the whitening phenomenon due to environmental changes, a plate-like molded article having a mirror surface on the end face is exposed to an environment of 60 ° C. and 90% relative humidity for 150 hours, and the test piece is placed in an environment of 23 ° C. and 50% relative humidity. Taking out and observing the whitening phenomenon occurring inside the molded product, the following judgment was made as a whitening suppression effect. ⁇ : No whitening occurs. ⁇ : Whitening occurs slightly after 1 hour after removal, but disappears after 24 hours. ⁇ : Whitening occurs after 1 hour after removal, but almost disappears after 24 hours. , Will not disappear after 24 hours
  • the Vicat softening temperature was determined according to JIS K-7206 at a heating rate of 50 ° C./hr and a test load of 50 N.
  • Table 2 shows the characteristics and evaluation results of each resin composition.
  • the molded articles of the examples were excellent in the whitening suppressing effect, were excellent in transparency and hue without deterioration in transmittance and YI value.
  • Comparative Examples 1-1, 1-2, and 1-4 where the hydrophilic additive was not added or the addition amount was too small, the suppression of the current whitening state was insufficient.
  • Comparative Examples 1-3 and 1-5 in which the hydrophilic additive was excessively added, the heat resistance was excessively lowered.
  • the tests were performed with the addition of stearyl alcohol and stearic acid monoglyceride, which are hydrophilic additives, respectively, but the effect of inhibiting whitening was insufficient.
  • styrenic resin was a copolymer of a styrenic monomer and (meth) acrylic acid or (meth) acrylic acid ester. was found to be obtained.
  • the polymerization reactor is configured by connecting a first reactor, which is a complete mixing tank, a second reactor, and a third reactor, which is a plug flow reactor with a static mixer.
  • the styrene resin was manufactured by the above.
  • the capacity of each reactor was 39 liters for the first reactor, 39 liters for the second reactor, and 16 liters for the third reactor.
  • a raw material solution was prepared with the raw material composition described in Table 1, and the raw material solution was continuously supplied to the first reactor at a flow rate described in Table 1.
  • hydrophilic additive which has a polyether chain
  • the types of additives and polyethylene glycol used are as follows.
  • B-1 Polyethylene glycol having an average molecular weight of 400 (PEG # 400 manufactured by NOF Corporation)
  • B-2 Polyethylene glycol having an average molecular weight of 1000 (PEG # 1000 manufactured by NOF Corporation)
  • B-3 Polyethylene glycol having an average molecular weight of 2000 (PEG # 2000 manufactured by NOF Corporation)
  • B-8 Polyethylene glycol monolaurate Ethylene oxide average addition mole
  • a solution containing a polymer continuously taken out from the third reactor was introduced into a vacuum devolatilization tank with a preheater constituted by two stages in series, and after separating unreacted styrene and ethylbenzene, strands were formed. After being extruded and cooled, it was cut into pellets.
  • the resin temperature in the first stage devolatilization tank is set to 160 ° C.
  • the pressure in the vacuum devolatilization tank is set to 65 kPa
  • the resin temperature in the second stage devolatilization layer is set to 235 ° C.
  • the pressure in the volatilization tank was 0.8 kPa.
  • Compound X is 6- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propoxy] -2,4,8,10-tetra-tert-butyldibenzo [d, f] [ 1,3,2] dioxaphosphepine, additive D represents a phosphorus-based antioxidant, and additive E represents a hindered phenol-based antioxidant.
  • D-1 Tris (2,4-di-tert-butylphenyl) phosphite (Irgafos 168 manufactured by BASF Japan Ltd.)
  • D-2 2,2′-methylenebis (4,6-di-tert-butyl-1-phenyloxy) (2-ethylhexyloxy) phosphorus (ADEKA STAB HP-10 manufactured by ADEKA Corporation)
  • D-3 Bis (2,4-dicumylphenyl) pentaerythritol diphosphite (Doverphos S-9228 manufactured by Dober Chemical Corporation)
  • D-4 3,9-bis (2,6-di-tert-butyl-4-methylphenoxy) -2,4,8,10-tetraoxa-3,9-diphosphaspiro [5.5] undecane ADEKA ADK STAB PEP-36)
  • E-1 Octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propyl
  • the melt mass flow rate (MFR) is in accordance with JIS K 7210, under conditions of 200 ° C. and 49 N load, and the Vicat softening temperature is in accordance with JIS K 7206, at a heating rate of 50 ° C./hr and a test load of 50 N. It was measured.
  • injection molding was performed at a cylinder temperature of 230 ° C. and a mold temperature of 50 ° C. to form a plate-shaped molded article having a thickness of 127 ⁇ 127 ⁇ 3 mm.
  • the obtained molded product was stored in an oven at 80 ° C. for 1000 hours.
  • a 115 ⁇ 85 ⁇ 3 mm thickness test piece was cut out from the plate-shaped molded product, the end surface was polished by buffing, and a mirror surface was formed on the end surface.
  • a plate-shaped molded article having the same was prepared.
  • the polished plate-like molded product was measured using an ultraviolet-visible spectrophotometer V-670 manufactured by JASCO Corporation, with an incident light having a size of 20 ⁇ 1.6 mm and a spread angle of 0 °, and a wavelength at an optical path length of 115 mm.
  • Spectral transmittances from 350 nm to 800 nm were measured, and the YI value at 2 ° for the C light source was calculated according to JIS K7105.
  • the transmittance shown in Table 3 represents the average transmittance at a wavelength of 380 nm to 780 nm.
  • ⁇ YI difference (YI difference from initial in Example with additional additive) ⁇ (YI difference from initial in Example without additional additive)
  • ⁇ YI difference (YI difference from initial in Example without additional additive)
  • the value of the YI difference from the initial value was 1.1
  • the YI difference from the initial value in Example 2-1 without an additional additive was 5.1. Therefore, the ⁇ YI difference in Example 2-2 is ⁇ 4.0.
  • This value represents the long-term thermal stability improvement effect of the additive (compound X, phosphorus-based D, hindered phenol-based E), and the smaller the value, the greater the long-term thermal stability improvement effect. I mean.
  • a plate-like molded article having a mirror surface on the end face is exposed to an environment of 60 ° C. and 90% relative humidity for 150 hours, and the test piece is placed in an environment of 23 ° C. and 50% relative humidity. Taking out and observing the whitening phenomenon occurring inside the molded product, the following judgment was made as a whitening suppression effect.
  • ⁇ No whitening occurs.
  • ⁇ Whitening occurs slightly after 1 hour after removal, but disappears after 24 hours.
  • ⁇ Whitening occurs after 1 hour after removal, but almost disappears after 24 hours. , Will not disappear after 24 hours
  • Table 3 shows the characteristics and evaluation results of each resin composition.
  • styrene resin A-1 prepared according to Condition 1 was used, and in Examples 2-43 to 2-44, styrene resin A-2 prepared according to Condition 2 was used.
  • styrene resin A-3 produced according to Condition 3 was used.
  • Test 3 (Examples 3-1 to 3-36)
  • the evaluation was performed in the same manner as in Test 2, except that Compound X was not added.
  • styrene resin A-1 prepared according to Condition 1 was used, and in Examples 3-33 to 3-34, styrene resin A-2 prepared according to Condition 2 was used.
  • styrene resin A-3 prepared according to Condition 3 was used. The results are shown in Table 4.
  • the styrenic resin composition of the present invention prevents the whitening phenomenon due to environmental changes and is excellent in transparency and hue, so that it is an advantage of the styrenic resin even in applications where the whitening phenomenon has conventionally occurred due to environmental changes. It can maintain transparency and can be used suitably. Furthermore, since the styrenic resin composition having excellent long-term thermal stability has a small hue change, it can be used while maintaining transparency and hue for a long period of time. For example, light guide plate applications such as a television, a desktop personal computer, a notebook personal computer, a mobile phone, and a car navigation can be used.

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Abstract

La présente invention a pour but de proposer une composition de résine optique à base de styrène transparente qui rend minimale une insuffisance des résines à base de styrène, à savoir que des changements environnementaux tels que des changements en température ou en humidité ou une immersion dans l'eau, provoquent la turbidité (blanchiment) des produits moulés à base de celle-ci. La présente invention concerne une composition de résine optique à base de styrène qui contient une résine à base de styrène ayant une masse moléculaire moyenne en poids de 150 000-700 000 et un additif hydrophile, et est caractérisée en ce que l'additif hydrophile : est au moins une substance choisie parmi les agents tensio-actifs polyoxyéthylènes ayant un nombre de moles ajouté moyen d'oxyde d'éthylène de 3-150 et/ou les polyéthylène glycols ayant une masse moléculaire moyenne de 200-10 000 ; a une valeur HLB de 5-20 ; et compose 0,4-2,0 % en masse des 100 % en masse de la composition de résine à base de styrène.
PCT/JP2012/082940 2011-12-20 2012-12-19 Composition de résine optique à base de styrène WO2013094641A1 (fr)

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KR20220005032A (ko) * 2019-04-23 2022-01-12 덴카 주식회사 스티렌계 수지 조성물, 성형품 그리고 도광판

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