JP2002372609A - Light ray reflection plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light rays reflection plate with high degree of flame resistance and further excellent in heat resistance and total reflectance. SOLUTION: The light rays reflection plate is characterized by being formed with use of a flame retardant resin composition containing 0.01-0.3 pts.wt. metal salt of perfluoroalkane sulfonic acid (B) and 1-30 pts.wt. titanium oxide (C) with respect to 100 pts.wt. polycarbonate resin (A). The light rays reflection plate is formed with use of a flame retardant resin composition additionally containing 0.01-2 pts.wt. drip-proof agent (D) with respect to 100 pts.wt. polycarbonate resin (A).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light reflector having high flame retardancy, heat resistance and excellent total light reflectance.

[0002]

Technical background of the invention The light reflecting plate has high flame retardancy,
It is required to have heat resistance and total light reflectance. Polycarbonate has higher self-extinguishing properties than other synthetic resins, and when molded, the reflector has excellent mechanical strength, heat distortion temperature, and electrical properties. Has an excellent characteristic of high reflectance.

[0003] However, polycarbonate resin is
Flame retardance is not always enough, like a light reflector,
There is a problem that it is difficult to apply to applications that require high flame retardancy, heat resistance and total light reflectance. In addition, in the application of the reflector for a liquid crystal display backlight, a high light-shielding property is required in addition to the high reflectance. Further, as the thickness of products using liquid crystal displays such as televisions and personal computers (PCs) is reduced, materials having excellent moldability are required.

Japanese Patent No. 2535445 proposes that a large amount of titanium oxide be added in order to improve the total light reflectance, but this method does not have sufficient flame retardancy. Patent No. 3124488 to improve flame retardancy
In Japanese Patent Application Publication No. 2002-131, a method of adding a phosphate ester as a flame retardant is also proposed. However, when a phosphate ester is used as described above, there is a problem that heat resistance represented by HDT (heat distortion temperature) is reduced. Was.

Under such circumstances, the emergence of a polycarbonate light reflector having high flame retardancy, heat resistance, and excellent total light reflectance has been desired.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a light reflector having high flame retardancy, heat resistance and excellent total light reflectance.

[0007]

SUMMARY OF THE INVENTION The light reflecting plate according to the present invention comprises: [A] 100 parts by weight of polycarbonate resin, [B] metal salt of perfluoroalkanesulfonic acid: 0.01 to 0.3 parts by weight, and
[C] Titanium oxide: characterized by being formed using a flame-retardant resin composition containing 1 to 30 parts by weight.

The light reflecting plate according to the present invention has a high flame retardancy and a high heat resistance since the titanium oxide and the metal salt of perfluoroalkanesulfonic acid are blended in the polycarbonate resin in specific amounts. A polycarbonate light reflector excellent in light reflectivity can be obtained. The light reflecting plate is made of [A] polycarbonate resin: 100
It is preferable that the composition is molded using a flame-retardant resin composition further containing [D] an anti-drip agent: 0.01 to 2 parts by weight with respect to parts by weight.

[0009] When the anti-drip agent is contained as described above, a light reflecting plate having more excellent flame retardancy can be produced. Such a light reflector is particularly suitable as a reflector for a liquid crystal backlight.

[0010]

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the light reflecting plate according to the present invention will be described. First, the flame-retardant resin composition used in the light reflecting plate according to the present invention will be described.

The flame-retardant resin composition comprises [A] a polycarbonate resin, [B] a metal salt of perfluoroalkanesulfonic acid,
It comprises [C] titanium oxide and, if necessary, [D] anti-drip agent. [A] Polycarbonate resin The polycarbonate resin used in the present invention includes:
An aromatic homopolycarbonate or an aromatic copolycarbonate obtained by reacting an aromatic dihydroxy compound with a carbonate precursor.

The carbonate-based resin generally has a repeating structural unit represented by the following formula (1).

[0013]

Embedded image

(In the above formula, A is a divalent residue derived from an aromatic dihydroxy compound.) The aromatic dihydroxy compound contains two functional hydroxyl groups, each of which is aromatic. Mononuclear or polynuclear aromatic compounds directly bonded to a nuclear carbon atom are included.

As the aromatic dihydroxy compound, a bisphenol compound represented by the following formula (2) is specifically exemplified.

[0016]

Embedded image

As the aromatic dihydroxy compound represented by the formula (2), specifically, bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 2,2 -Bis (4-hydroxyphenyl) propane (so-called bisphenol A), 2,2-bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) octane, bis (4-hydroxyphenyl) phenylmethane , 2,2-bis (4-hydroxy-1-methylphenyl) propane, 1,1-bis (4-hydroxy-t-butylphenyl)
Propane, 2,2-bis (4-hydroxy-3-bromophenyl)
Propane, 2,2- (4-hydroxy-3,5-dibromophenyl)
Bis (hydroxyaryl) alkanes such as propane; bis (hydroxyaryl) cycloalkanes such as 1,1-bis (4-hydroxyphenyl) cyclopentane and 1,1- (4-hydroxyphenyl) cyclohexane; 4,4 '
-Dihydroxydiphenyl ether, 4,4'-dihydroxy
Dihydroxyaryl ethers such as -3,3'-dimethylphenyl ether; dihydroxydiaryl sulfides such as 4,4'-dihydroxydiphenyl sulfide and 4,4'-dihydroxy-3,3'-dimethylphenyl sulfide;
Dihydroxydiarylsulfoxides such as 4,4'-dihydroxydiphenylsulfoxide and 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfoxide;4,4'-dihydroxydiphenylsulfone,4,4'-dihydroxy-3,3'-
Examples include, but are not limited to, dihydroxydiarylsulfones such as dimethyldiphenylsulfone.

Of these aromatic dihydroxy compounds,
In particular, 2,2-bis (4-hydroxyphenyl) propane (bisphenol A) is preferably used. Further, as the aromatic dihydroxy compound other than the above formula (2), an aromatic dihydroxy compound represented by the following formula (3) can also be used.

[0019]

Embedded image

(Where R ^f is independently a hydrocarbon group having 1 to 10 carbon atoms, a halogenated hydrocarbon group in which at least one of the hydrocarbon groups is substituted with a halogen atom, or a halogen atom And p is an integer from 0 to 4.) Examples of such a compound include resorcin; and 3-methylresorcin, 3-ethylresorcin, 3-propylresorcin, 3-butylresorcin, 3-tert-butylresorcinol. , 3-phenylresorcinol, 3-cumylresorcinol,
Substituted resorcinols such as 2,3,4,6-tetrafluororesorcin and 2,3,4,6-tetrabromoresorcin; catechol; hydroquinone, and 3-methylhydroquinone, 3-ethylhydroquinone, 3-propylhydroquinone, 3- Butylhydroquinone, 3-t-butylhydroquinone, 3-phenylhydroquinone, 3-cumylhydroquinone, 2,3,5,6-tetramethylhydroquinone, 2,3,5,6-tetra-t-butylhydroquinone, 2, Substituted hydroquinones such as 3,5,6-tetrafluorohydroquinone and 2,3,5,6-tetrabromohydroquinone are exemplified.

The aromatic dihydroxy compound other than the above formula (2) is represented by the following formula:

[0022]

Embedded image

2,2,2 ', 2'-tetrahydro-3,3,3
3 ′, 3′-Tetramethyl-1,1′-spirobi- [1H-indene] -7,7′-diol can also be used. These aromatic dihydroxy compounds may be used alone or in combination of two or more. Further, the polycarbonate may be linear or branched. Further, a blend of a linear polycarbonate and a branched polycarbonate may be used.

[0024] Such a branched polycarbonate is obtained by reacting a polyfunctional aromatic compound with an aromatic dihydroxy compound and a carbonate precursor. Representative examples of such polyfunctional aromatic compounds are described in U.S. Pat.
No. 3,028,385, No. 3,334,154, No. 4,00
No. 1,124 and 4,131,576, specifically, 1,1,1-tris (4-hydroxyphenyl) ethane, 2,2 ′, 2 ″ -tris (4-hydroxy Phenyl)
Diisopropylbenzene, α-methyl-α, α ′, α′-tris (4-hydroxyphenyl) -1,4-diethylbenzene, α,
α ', α "-tris (4-hydroxyphenyl) -1,3,5-triisopropylbenzene, phloroglysin, 4,6-dimethyl-
2,4,6-tri (4-hydroxyphenyl) -heptane-2,1,3,5
-Tri (4-hydroxyphenyl) benzene, 2,2-bis- [4,4
-(4,4'-dihydroxyphenyl) -cyclohexyl] -propane, trimellitic acid, 1,3,5-benzenetricarboxylic acid, pyromellitic acid and the like. Of these,
1,1,1-tris (4-hydroxyphenyl) ethane, α, α ′,
α "-Tris (4-hydroxyphenyl) -1,3,5-triisopropylbenzene is preferably used.

The polycarbonate used in the present invention is:
Although not limited thereto, preferably, the intrinsic viscosity is in the range of 0.30 to 0.58, more preferably 035 to
It is desirable to be in the range of 0.53. The intrinsic viscosity is a value measured at 20 ° C. using an Ostwald viscometer with methylene chloride as a solvent. The polycarbonate resin used in the present invention is manufactured by a known manufacturing method. For example, a method of synthesizing a polycarbonate by subjecting an aromatic dihydroxy compound and a carbonate precursor (eg, carbonic acid diester) to transesterification in a molten state (melting method), a method in which an aromatic dihydroxy compound and a carbonate precursor (eg, phosgene ) (Interface method).

These production methods are described, for example, in JP-A-2-175723, JP-A-2-124934, U.S. Pat. Nos. 4,001,184, 4,238,569 and 4,238.
Nos. 238,597 and 4,474,999. Examples of the carbonic acid diester used in the method (melting method) (melting method) include diphenyl carbonate, bis (chlorophenyl) carbonate, bis (2,4-dichlorophenyl) carbonate, and bis (2,4,6-trichlorophenyl). ) Carbonate, bis (2-cyanophenyl) carbonate, bis (o-nitrophenyl) carbonate, ditolyl carbonate, m-cresyl carbonate, dinaphthyl carbonate, bis (diphenyl) carbonate, diethyl carbonate, dimethyl carbonate, dibutyl carbonate, Dicyclohexyl carbonate and the like. Of these, diphenyl carbonate is preferably used. Two or more of these can be used in combination. Among these, diphenyl carbonate is particularly preferably used. Further, such a carbonic acid diester may contain a dicarboxylic acid or a dicarboxylic acid ester. Specifically, the carbonic acid diester is a dicarboxylic acid or dicarboxylic acid ester, preferably 50
It may be contained in an amount of at most 30 mol%, more preferably at most 30 mol%.

Examples of such a dicarboxylic acid or dicarboxylic acid ester include terephthalic acid, isophthalic acid, sebacic acid, decane diacid, dodecane diacid, diphenyl sebacate, diphenyl terephthalate, diphenyl isophthalate, diphenyl decane diacid, dodecane And diphenyl diacid. The carbonic acid diester may contain two or more of these dicarboxylic acids or dicarboxylic acid esters.

Polycarbonate is obtained by polycondensing the above-mentioned carbonic acid diester with the aromatic dihydroxy compound. In producing polycarbonate, the carbonic acid diester as described above is used in an amount of 0.95 to 1.30 mol, based on 1 mol of the aromatic dihydroxy compound in total.
Preferably, it is used in an amount of 1.01 to 1.20 mol.

In such a melting method, for example, a compound proposed by the present applicant in JP-A-4-175368 is used as a catalyst. Specifically, as a melt polycondensation catalyst,
Usually, (a) an alkali metal compound and / or an alkaline earth metal compound (hereinafter also referred to as (a) an alkali (earth) metal compound) are used. (a) As the alkali (earth) metal compound, an organic acid salt, an inorganic acid salt, an oxide, a hydroxide, a hydride or an alcoholate of an alkali metal or an alkaline earth metal is preferably used.

Specifically, examples of the alkali metal compound include sodium hydroxide, potassium hydroxide, lithium hydroxide, sodium hydrogen carbonate, potassium hydrogen carbonate, lithium hydrogen carbonate, sodium carbonate, potassium carbonate, lithium carbonate, sodium acetate, Potassium acetate, lithium acetate, sodium stearate, potassium stearate, lithium stearate, sodium borohydride, lithium borohydride, sodium phenyl hydride, sodium benzoate, potassium benzoate, lithium benzoate, disodium hydrogen phosphate Dibasic potassium phosphate, dilithium hydrogen phosphate, disodium salt of bisphenol A, dipotassium salt, dilithium salt, phenol sodium salt, potassium salt, lithium salt and the like. Calcium hydroxide, barium hydroxide, magnesium hydroxide, strontium hydroxide,
Calcium bicarbonate, barium bicarbonate, magnesium bicarbonate, strontium bicarbonate, calcium carbonate,
Examples include barium carbonate, magnesium carbonate, strontium carbonate, calcium acetate, barium acetate, magnesium acetate, strontium acetate, calcium stearate, barium stearate, magnesium stearate, and strontium stearate. Two or more of these compounds can be used in combination.

Such an alkali (earth) metal compound is used in an amount of 1 × 10 ^-8 to 1 per mol of bisphenol.
X 10 ^-3 mol, preferably 1 x 10 ^-7 to 2 x 10 ^-6 mol, more preferably 1 x 10 ^-7 to 8 x 10 ^-7 mol, contained in the melt polycondensation reaction. It is desirable.
Further, when an alkali (earth) metal compound is previously contained in the bisphenol as a raw material of the melt polycondensation reaction, the amount of the alkali (earth) metal compound present at the time of the melt polycondensation reaction is reduced to 1 It is desirable to control the addition amount so as to be within the above range with respect to the mole.

As the melt polycondensation catalyst, a basic compound (b) may be used in addition to the above-mentioned (a) alkali (earth) metal compound. Examples of such a basic compound (b) include a nitrogen-containing basic compound that is easily decomposed or volatile at a high temperature, and specific examples include the following compounds.

Tetramethylammonium hydroxide (Me ₄ NOH), tetraethylammonium hydroxide (Et ₄ NOH), tetrabutylammonium hydroxide (Bu ₄ NOH), trimethylbenzylammonium hydroxide (φ-CH ₂ (Me) ₃ NOH ), Such as alkyl, aryl,
Ammonium hydroxides having an araryl group and the like, tertiary amines such as trimethylamine, triethylamine, dimethylbenzylamine and triphenylamine, R ₂ NH (where R is an alkyl group such as methyl and ethyl, and aryl such as phenyl and tolyl) A primary amine represented by RNH ₂ (where R is the same as described above), 4-dimethylaminopyridine, 4-diethylaminopyridine, 4-pyrrolidinopyridine, etc. Pyridines, imidazoles such as 2-methylimidazole and 2-phenylimidazole, or ammonia, tetramethylammonium borohydride (Me
Basic salts such as ₄ NBH ₄ ), tetrabutylammonium borohydride (Bu ₄ NBH ₄ ), tetrabutylammonium tetraphenylborate (Bu ₄ NBPh ₄ ), and tetramethylammonium tetraphenylborate (Me ₄ NBPh ₄ ).

Of these, tetraalkylammonium hydroxides are preferably used. As above
(b) The nitrogen-containing basic compound is used in an amount of 1 × 10 ^-6 to 1 × 10 ^-1 mol, preferably 1 × 1 ^-1 mol, per mol of bisphenols.
It can be used in an amount of 0 ^-5 to 1 × 10 ^-2 mol. Further, (c) a boric acid compound can also be used as a catalyst.

Examples of the boric acid compound (c) include boric acid and borate esters.
Examples of the borate ester include a borate ester represented by the following general formula. B (OR) _n (OH) _{3-n In the} formula, R is alkyl such as methyl and ethyl, aryl such as phenyl, and n is 1, 2, or 3.

Specific examples of such borate esters include trimethyl borate, triethyl borate, tributyl borate, trihexyl borate, triheptyl borate, triphenyl borate, tritolyl borate, and trinaphthyl borate. Is mentioned. Such boric acid or borate (c) is used in an amount of 1 × 10 ^-8 to 1 × 10 ^-1 mol, preferably 1 × 10 ^-1 mol, per mol of bisphenols.
^-7 to 1 × 10 ^-2 mol, more preferably 1 × 10 ^-6 to 1
It can be used in an amount of × 10 ^-4 mol. Examples of the melt polycondensation catalyst include a combination of (a) an alkali (earth) metal compound and (b) a nitrogen-containing basic compound,
It is preferable to use a combination of (a) an alkali (earth) metal compound, (b) a nitrogen-containing basic compound, and (c) boric acid or a borate ester.

When the above amount of (a) an alkali (earth) metal compound and (b) a nitrogen-containing basic compound are used in combination as a catalyst, the polycondensation reaction can proceed at a sufficient rate. It is preferable because it can produce a high molecular weight polycarbonate with high polymerization activity. When (a) an alkali (earth) metal compound and (b) a nitrogen-containing basic compound are used in combination, or (a) an alkali (earth) metal compound and (b) a nitrogen-containing basic compound and (c) ) When boric acid or boric acid ester is used in combination, a mixture of the respective catalyst components may be added to a molten mixture of bisphenols and carbonic acid diester, or a mixture of bisphenols and carbonic acid diester may be individually melted. It may be added to the mixture. Examples of the carbonate precursor used in the interface method of [Interface method] include carbonyl halide, diaryl carbonate, and bishaloformate.
Either may be used. Examples of the carbonyl halide include carbonyl bromide, carbonyl chloride (so-called phosgene), and a mixture thereof. Examples of the aryl carbonate include diphenyl carbonate, diphenyl carbonate, ditolyl carbonate, bis (chlorophenyl) carbonate, m-cresyl carbonate, dinaphthyl carbonate, bis (diphenyl) carbonate, and the like. Examples of the bishaloformate include, for example, 2,2-bis (4-hydroxyphenyl) propane and 2,2-bis (4-hydroxy-3,5
Bischloroformates or bisbromoformates of aromatic dihydroxy compounds such as -dichlorophenyl) propane and hydroquinone; and bischloroformates or bisbromoformates of glycols such as ethylene glycol. While any of the above carbonate precursors are useful, carbonyl chloride (ie, phosgene) is preferred.

In this interfacial method, first, the aromatic dihydroxy compound is dissolved or dispersed in an aqueous caustic solution, the resulting mixture is added with a solvent incompatible with water, and these reactants are converted to a suitable catalyst. In the presence of a particular p
This is done by contacting with a carbonate precursor such as phosgene under H conditions. Usually, methylene chloride, 1,2-dichloroethane, chlorobenzene, toluene or the like is used as a solvent that is incompatible with water used. The catalyst used in the interface method is not particularly limited, but is usually a tertiary amine such as triethylamine,
Quaternary phosphonium compounds, quaternary ammonium compounds and the like are used. The reaction temperature in the interface method is not particularly limited as long as the reaction proceeds, but is preferably in the range of room temperature (25 ° C.) to 50 ° C.

The polycarbonate obtained by these or the production methods may be end-capped with a specific functional group, if necessary. Examples of the terminal blocking agent include, but are not particularly limited to, phenol, monovalent phenols such as chroman-I and p-cumylphenol. [B] Metal salt of perfluoroalkanesulfonic acid As the metal salt of perfluoroalkanesulfonic acid, a metal sulfonic acid salt having a perfluoroalkane group having 4 to 8 carbon atoms is preferable, and a sodium salt of perfluorobutanesulfonic acid is more preferable. And potassium salts of perfluorobutanesulfonic acid, sodium salts of perfluoromethylbutanesulfonic acid, potassium salts of perfluoromethylbutanesulfonic acid, sodium salts of perfluorooctanesulfonic acid, potassium salts of perfluorooctanesulfonic acid, and the like. Can be

Of the above, potassium salts of perfluorobutanesulfonic acid are particularly preferably used. [B] The amount of the metal salt of perfluoroalkanesulfonic acid is 0.01 to 0.3 parts by weight, based on 100 parts by weight of the polycarbonate resin [A].
Preferably, 0.03 to 0.1 part by weight is blended.

[B] The metal salt of perfluoroalkanesulfonic acid is added for the purpose of making the polycarbonate resin composition flame-retardant. If the addition amount is within the above range, the flame-retardant effect is high and the heat resistance is excellent. A reflector can be obtained. Such a metal salt of perfluoroalkanesulfonic acid has a property of not lowering the heat distortion temperature represented by HDT, as compared with a conventionally used compound containing phosphorus.

When the amount of the perfluoroalkanesulfonic acid metal salt exceeds 0.3 parts by weight, the heat resistance of the reflector may decrease.
Flame retardancy may be insufficient. [C] Titanium oxide Titanium oxide has a particle size of 0.05 μm or more, preferably 0.1 μm
m or more and 5 μm or less, preferably 1 μm or less are suitably used.

The surface of the titanium oxide is made of an organic silane compound.
(Such as a silane coupling agent) and an organic siloxane compound (for example, TSF484, manufactured by GE Toshiba Silicone Co., Ltd.), and may be surface-treated (hydrophobized). Surface treatment (coating treatment) with a substance or hydroxide. Particularly preferably, those surface-treated with an organic siloxane compound are desirable. By performing this treatment, the uniform dispersibility of the titanium oxide in the composition and the stability of the dispersed state are improved, and further, the affinity with the perfluoroalkanesulfonic acid metal salt can be improved, and the uniformity can be improved. A composition can be obtained.

The crystal structure of titanium oxide is not particularly limited, but rutile type titanium is preferable. The amount of [C] titanium oxide is desirably 1 to 30 parts by weight, preferably 3 to 20 parts by weight, based on 100 parts by weight of the polycarbonate resin [A]. When the amount of titanium oxide is within the above range, a light reflecting plate having a high reflectivity can be obtained because the titanium oxide has an appropriate amount of transmitted light. If the amount of titanium oxide is less than 1 part by weight, the amount of transmitted light increases, and reflection with high reflectance cannot be obtained.
If the amount exceeds 30 parts by weight, the thermal stability during thermoforming may decrease, that is, the appearance of the molded product (reflection plate) may be stained.

A fluorescent whitening agent may be used together with titanium oxide. By adding a fluorescent whitening agent, the light reflectance around 430 to 450 nm can be improved. [D] Anti-drip agent The anti-drip agent used in the present invention is:
An additive that has the function of suppressing drip (dropping)
Known ones can be used. In particular, a polycarbonate-based resin represented by polytetrafluoroethylene (PTFE) or the like, which forms a fibril structure, is preferred because of its high drip suppression effect.

Among such polytetrafluoroethylene (PTFE), those having excellent dispersibility, for example, those obtained by emulsifying and dispersing PTFE in a solution such as water, and polycarbonates and styrene-acrylonitrile copolymers are represented. A resin obtained by encapsulating PTFE with a resin is preferable because it gives an excellent surface appearance to the obtained molded body (light reflecting plate).

In the case where PTFE is emulsified and dispersed in a solution such as water, there is no particular limitation. However, it is preferable that the PTFE has an average particle diameter of 1 micron or less, particularly 0.5 micron or less. Such PTFE
Specific examples of those commercially available as Teflon (R) 30J (Mitsui DuPont Fluorochemical Co., Ltd.), Polyflon D-2C (Daikin Chemical Industry Co., Ltd.), Aflon AD1 (Asahi Glass Co., Ltd.) and the like. Can be

The anti-drip agent is used in an amount of 0.01 to 2 parts by weight, preferably 0.05 to 1 part by weight, more preferably 0.1 to 0.1 part by weight, based on 100 parts by weight of the polycarbonate resin.
It is added in the range of 5 parts by weight. When the amount of the component [D] is less than the above range, an excellent flame retardant composition cannot be obtained, and when the amount is more than the above range, the fluidity may be impaired.

Further, such polytetrafluoroethylene can be produced by a known method (see US Pat. No. 2,393,967). In particular,
Using a free catalyst such as sodium, potassium or ammonium peroxydisulfate in an aqueous solvent under a pressure of 100-1000 psi at 0-200 <0> C
Polytetrafluoroethylene can be obtained as a white solid by polymerizing tetrafluoroethylene, preferably under a temperature condition of 20 to 100 ° C.

Such polytetrafluoroethylene has a molecular weight of 500,000 or more, preferably 1,000,000 to 500.
It is desirable to use the one of 10,000. In addition to the above [A] to [D], a phosphorus-based stabilizer, an epoxy-based stabilizer, a hindered phenol-based antioxidant, a release agent, an ultraviolet absorber and the like may be further contained. As the phosphorus-based stabilizer, those which are conventionally marketed as antioxidants can be used without particular limitation. Specifically, phosphorous acid, triphenyl phosphite, diphenyl nonyl phosphite, tris-
(2,4-di-t-butylphenyl) phosphite, trisnonylphenyl phosphite, diphenylisooctyl phosphite, 2,2′-methylenebis (4,6-di-t-butylphenyl) octyl phosphite, diphenyl Isodecyl phosphite, diphenyl mono (tridecyl) phosphite,
2,2'-ethylidenebis (4,6-di-t-butylphenol)
Fluorophosphite, phenyldiisodecylphosphite, phenyldi (tridecyl) phosphite, tris (2-ethylhexyl) phosphite, tris (isodecyl) phosphite, tris (tridecyl) phosphite, dibutylhydrogenphosphite, trilauryltrithiophosphite, Tetrakis (2,4-di-t-butylphenyl) -4,4'-biphenylenediphosphonite, 4,4 '
- isopropylidenediphenol alkyl (C ₁₂ ~
C ₁₅ ) phosphite, 4,4′-butylidenebis (3-methyl-
6-t-butylphenyl) di-tridecyl phosphite, bis (2,4-di-t-butylphenyl) pentaerythritol diphosphite, bis (2,6-di-t-butyl-4-methylphenyl) Pentaerythritol diphosphite, bis (nonylphenyl) pentaerythritol diphosphite,
Distearyl-pentaerythritol diphosphite,
Phenyl-bisphenol A pentaerythritol diphosphite, tetraphenyldipropylene glycol diphosphite, 1,1,3-tris (2-methyl-4-di-tridecylphosphite-5-t-butylphenyl) butane, 3 , 4,5,6
-Tetrabenzo-1,2-oxaphosphane-2-oxide and the like can be used.

It is desirable that the phosphorus-based stabilizer is added in an amount of 0.0001 to 1 part by weight, preferably 0.001 to 0.5 part by weight, based on 100 parts by weight of the polycarbonate resin. Epoxy stabilizers include epoxidized soybean oil, epoxidized linseed oil, phenylglycidyl ether, allyl glycidyl ether, t-butylphenyl glycidyl ether, and 3,4-epoxycyclohexylmethyl
-3 ', 4'-epoxycyclohexylcarboxylate, 3,4
-Epoxy-6-methylcyclohexylmethyl -3 ', 4'-epoxy-6'-methylcyclohexylcarboxylate, 2,3-
Epoxycyclohexylmethyl-3 ′, 4′-epoxycyclohexylcarboxylate, 4- (3,4-epoxy-5-methylcyclohexyl) butyl-3 ′, 4′-epoxycyclohexylcarboxylate, 3,4-epoxycyclohexylethylene oxide, Cyclohexylmethyl-3,4-epoxycyclohexylcarboxylate, 3,4-epoxy-6-methylcyclohexylmethyl-6′-methylsilohexylcarboxylate, bisphenol A diglycidyl ether,
Tetrabromobisphenol A glycidyl ether, diglycidyl ester of phthalic acid, diglycidyl ester of hexahydrophthalic acid, bis-epoxydicyclopentadienyl ether, bis-epoxyethylene glycol, bis-epoxycyclohexyl adipate, butadiene diepoxide, tetra Phenylethylene epoxide, octyl epoxy tartrate, epoxidized polybutadiene, 3,4-dimethyl-1,2-epoxycyclohexane, 3,5
-Dimethyl-1,2-epoxycyclohexane, 3-methyl-5-t
-Butyl-1,2-epoxycyclohexane, octadecyl-
2,2-dimethyl-3,4-epoxycyclohexylcarboxylate, N-butyl-2,2-dimethyl-3,4-epoxycyclohexylcarboxylate, cyclohexyl-2-methyl-3,
4-epoxycyclohexyl carboxylate, N-butyl
2-isopropyl-3,4-epoxy-5-methylcyclohexylcarboxylate, octadecyl-3,4-epoxycyclohexylcarboxylate, 2-ethylhexyl-3 ', 4'
-Epoxycyclohexylcarboxylate, 4,6-dimethyl-2,3-epoxycyclohexyl-3 ', 4'-epoxycyclohexylcarboxylate, 4,5-epoxytetrahydrophthalic anhydride, 3-t-butyl-4,5- Epoxy tetrahydrophthalic anhydride, diethyl-4,5-epoxy-cis-1,2-cyclohexyldicarboxylate, di-n-butyl-3-t-
Butyl-4,5-epoxy-cis-1,2-cyclohexyldicarboxylate and the like.

These may be used alone or in combination of two or more. Such an epoxy stabilizer is used in an amount of 0.00% by weight based on 100 parts by weight of the polycarbonate resin.
It is desirable that the compounding amount is in the range of 0.01 to 5 parts by weight, preferably 0.001 to 1 part by weight, and more preferably 0.005 to 0.5 part by weight. As a hindered phenolic antioxidant, specifically, n-octadecyl-3- (3 ', 5'-di
-t-butyl-4-hydroxyphenyl) propionate, 2,
6-di-t-butyl-4-hydroxymethylphenol, 2,2'-
Methylenebis (4-methyl-6-t-butylphenol), pentaerythrityl-tetrakis [3- (3 ', 5'-di-t-butyl-4-
Hydroxyphenyl) propionate]. These may be used alone or in combination of two or more.

Such a hindered phenolic antioxidant is used in an amount of 0.0001 to 100 parts by weight of the thermoplastic resin.
It is desirable to add 1 part by weight, preferably in the range of 0.001 to 0.5 part by weight. Release agents include silicone release agents such as methylphenylsilicone oil, release agents such as pentaerythritol tetrastearate, glycerin monostearate, and esters such as montanic acid wax, and olefins such as poly α-olefin. Release agents and the like. The release agent is polycarbonate resin 1
0.01 to 5 parts by weight, preferably 0.1 to 5 parts by weight, per 100 parts by weight.
Examples of the ultraviolet absorber desirably blended in the range of 0.5 to 2 parts by weight, more preferably 0.1 to 1 part by weight include benzotriazole-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, and salicylate-based ultraviolet absorbers. Is mentioned.

As the benzotriazole ultraviolet absorber, specifically, 2- (2'-hydroxy-5'-methylphenyl)
Benzotriazole, 2- (2'-hydroxy-5'-t-butylphenyl) benzotriazole, 2- (2'-hydroxy-5'-t-
(Octylphenyl) benzotriazole, 2- (2'-hydroxy-3 ', 5'-di-t-butylphenyl) benzotriazole, 2- (2'-hydroxy-3', 5'-di-amylphenyl) benzo Triazole, 2- (2'-hydroxy-3'-dodecyl-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-
3 ', 5'-Dicumylphenyl) benzotriazole, 2,2'-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol] And the like. Such a benzotriazole-based ultraviolet absorber,
For example, UV5411 from American Cyanamid
It is commercially available as A benzophenone-based ultraviolet absorber is commercially available, for example, as Symmit UV531. Further, examples of the salicylate-based ultraviolet absorber include phenyl salicylate, pt-butylphenyl salicylate, p-octylphenyl salicylate and the like.

These ultraviolet absorbers are used in an amount of 0.01 to 10 parts by weight, preferably 0.05 to 5 parts by weight, based on 100 parts by weight of the polycarbonate resin.
In particular, when the reflector is used as a reflector for a liquid crystal backlight, it is desirable that the flame retardant resin composition contains an antistatic agent. Examples of the antistatic agent include alkali metal salts of alkyl benzene sulfonic acid (sodium salt, potassium salt, lithium salt, etc.) and phosphonium salt of alkyl benzene sulfonic acid. In the present invention, phosphonium dodecyl benzene sulfonic acid salt has a flame retardant property. It is preferable because the decrease in high reflectivity is small. The amount of the antistatic agent added was 100 parts by weight of the polycarbonate [A],
It is 0.001 to 4 parts by weight, preferably 0.005 to 2 parts by weight. Within such a range, it is possible to obtain a reflection plate which is less likely to adhere to dust and dust and has excellent heat resistance and appearance.

The resin composition used in the light reflecting plate according to the present invention is kneaded with the above components [A], [B] and [C], and if necessary, component [D] and other components. It can be obtained by: Known additives such as colorants (pigments, dyes), fillers, and reinforcing agents may be added to such a resin composition at the time of mixing or molding the resin composition according to the purpose, as long as the physical properties are not impaired. Glass fiber, carbon fiber, talc, clay, mica, glass flake, milled glass, glass beads), lubricant, plasticizer, flame retardant, flow improver, etc.
It may be added.

The method for producing the resin composition of the present invention is not particularly limited, and a known method can be used.
In particular, a melt mixing method is desirable. When producing the resin composition, a small amount of a solvent may be added. Examples of the apparatus include, in particular, an extruder, a Banbury mixer, a roller, a kneader, etc., which are operated batchwise or continuously. At this time, the mixing order of the components is not particularly limited.

The kneading temperature is not particularly limited, but is usually suitably selected from the range of 240 to 340 ° C. [Reflective Plate] A flat plate or a curved plate is formed by using the polycarbonate-based flame-retardant resin composition to obtain a light-reflecting plate, particularly a light-reflecting plate for a lighting device and a light-reflecting plate for a liquid crystal backlight.

The molding method is not particularly limited, and a known molding method such as injection molding is employed.
The light reflector obtained in this manner contains a specific amount of [B] a metal salt of perfluoroalkanesulfonic acid, [C] titanium oxide, and if necessary, [D] an anti-drip agent. , High flame retardancy, and excellent heat resistance and total light reflectance.

[0060]

According to the present invention, since a specific polycarbonate-based flame-retardant resin composition is used, high reflectivity and high mechanical properties can be obtained without impairing mechanical properties such as flame retardancy and impact resistance.
It is possible to obtain a light-reflecting plate which is excellent in light-shielding properties, heat-aging resistance, dust-adhesion resistance and the like, and has a small decrease in reflectance even after long-term use.

Such a light reflector is useful as a light reflector for a lighting device, a reflector for a liquid crystal display backlight (including a frame for a liquid crystal display backlight), and the like.

[0062]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. Unless otherwise specified, parts in the examples represent parts by weight, and% represents% by weight.

The following compounds were used as each component. [A] Polycarbonate resin: Polycarbonate produced by the interface method (intrinsic viscosity 0.41, intrinsic viscosity is a value measured at 20 ° C. using methylene chloride as a solvent using an Ostwald viscometer, manufactured by Nippon GE Plastics Co., Ltd.) Manufactured polycarbonate (Intrinsic viscosity 0.36,
The intrinsic viscosity is a value measured at 20 ° C. with methylene chloride as a solvent using an Ostwald viscometer (manufactured by Nippon GE Plastics). [B] Potassium perfluorobutanesulfonate (trade name; B
ayowet C4, manufactured by Bayer AG). [C] Titanium oxide: trade name; R107C, manufactured by DuPont). [D] Anti-drip agent: PTFE encapsulated with styrene-acrylonitrile resin and having a PTFE content of 50% by weight was used (hereinafter, anti-drip agent). Polyflon D-2C (trademark, Daikin Chemical Industry Co., Ltd.) was used. PTFE is emulsified and dispersed in water and has a PTFE content of 60% by weight (hereinafter referred to as an anti-drip agent). In Example 3, polyflon D-2C was used.
Is added in an amount of 0.67 parts by weight with respect to the polycarbonate resin, so that 0.4 parts by weight of the actual PTFE is added. Water evaporates at the time of preparing the resin composition.

[0064]

Example 1 50 parts by weight of polycarbonate, 50 parts by weight of polycarbonate, 0.08 parts by weight of potassium perfluorobutanesulfonate, 12 parts by weight of titanium oxide,
0.5 parts by weight of anti-drip agent (PTFE) (actual
Since the PTFE content is 50% by weight thereof, it is 0.25 parts by weight). Release agent: pentaerythritol tetrastearate (trade name: LOXIOLVPG861, Cognis Japan Co., Ltd.)
0.35 parts by weight, stabilizer: Tris (2,4-di-t-butylphenyl) phosphite (trademark; MK2112, Asahi Denka)
280 parts by weight.
Pellets were produced by a twin screw extruder at 260 ° C. and 260 rpm. Using the pellets, a molded product having a predetermined size was injection-molded by an injection molding machine under molding conditions of a barrel temperature of 280 ° C. and a mold temperature of 80 ° C. The obtained molded article was evaluated by performing the following tests.

[0065]

Example 2 100 parts by weight of polycarbonate, 0.08 parts by weight of potassium perfluorobutanesulfonate, 12 parts by weight of titanium oxide, 0.5 parts by weight of anti-drip agent (PTFE) (the actual PTFE content is 0.25 parts by weight because it is 50% by weight), release agent: 0.3 parts by weight of pentaerythritol tetrastearate (trade name: LOXIOLVPG861, manufactured by Cognis Japan KK), stabilizer: tris (2,4-di) -t-butylphenyl) phosphite (trade name;
(MK2112, manufactured by Asahi Denka Co., Ltd.) was mixed to be 0.045 parts by weight, extruded in the same manner as in Example 1, injection molded, and the obtained molded article was evaluated by performing the following tests. did.

[0066]

Example 3 100 parts by weight of polycarbonate, 0.05 parts by weight of potassium perfluorobutanesulfonate, 12 parts by weight of titanium oxide, an anti-drip agent (Polyflon D-
2C) is 0.67 parts by weight (the actual PTFE content is 60% thereof, so 0.4 parts by weight), mold release agent: pentaerythritol tetrastearate (trade name: LOXIOLVPG861, manufactured by Cognis Japan Co., Ltd.) 0.3 Parts by weight, stabilizer: tris (2,4-di-t-butylphenyl) phosphite (trademark; MK
2112, manufactured by Asahi Denka Co., Ltd.), extruded in the same manner as in Example 1, injection-molded, and subjected to the following tests for the obtained molded article. did. (1) Flame retardant Bulletin 9 from Underwriters Laboratories Inc.
4 Measured in accordance with "Combustion test for material classification" (referred to as UL-94 test). The thickness of the test piece was tested at 1.6 mm. Using five test pieces, the burning time after a total of 10 times of flame contact was measured, and the total burning time and the presence or absence of drip were evaluated. (2) HDT (heat distortion temperature) According to ASTM-D648, a 6.4 mm thick test piece was used.
It was measured with a 8.6 kg load.

HDT indicates that the higher the value, the higher the heat resistance. (3) Total light reflectivity A 3 mm thick (5 cm x 5 cm square plate) injection molded plate is molded at a cylinder temperature of 280 ° C and a mold temperature of 80 ° C, and the total light is measured using a spectrophotometer (Minolta CM-3700d). The reflectance was measured.

[0068]

[Table 1]

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) G02F 1/1335 520 G02F 1/1335 520 1/13357 1/13357 F-term (Reference) 2H042 BA02 BA15 BA20 2H091 FA14Z FA41Z FB02 FB12 LA18 4J002 BD152 CG001 CG011 CG031 DE137 EV256 FB282 FD202 GP00

Claims (3)

[Claims] 1. [A] Polycarbonate resin: 100 parts by weight, [B] Perfluoroalkanesulfonic acid metal salt: 0.01 to 0.3
A light reflecting plate formed by using a flame-retardant resin composition containing 1 part by weight and [C] titanium oxide: 1 to 30 parts by weight. 2. A flame-retardant resin composition containing [A] a polycarbonate resin: 100 parts by weight and [D] an anti-drip agent: 0.01 to 2 parts by weight. Claim 1
4. The light reflector according to item 1. 3. The light reflector according to claim 1, wherein the light reflector is a reflector for a liquid crystal backlight.