JP2020200373A - Polycarbonate resin composition and illumination cover - Google Patents

Abstract

To provide a polycarbonate resin composition excellent in a ray transmittance and a dispersion degree and having high flame retardancy.SOLUTION: The polycarbonate resin composition contains, with respect to 100 pts.mass of (A) an aromatic polycarbonate resin, 0.38 to 0.62 pts.mass of (B) a silicone-based light diffusing agent, 0.038 to 0.062 pts.mass of (C) potassium trifluoromethane sulfonate, 0.075 to 0.125 pts.mass of (D) polytetrafluoroethylene, and 0.15 to 0.50 pts.mass of (E) octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, and further contains (F) Solvent Blue 97 and Solvent Violet 36 by 0.1 to 0.3 ppm by mass in total in the resin composition.SELECTED DRAWING: None

Description

The present invention relates to a polycarbonate resin composition and a luminaire cover made of the same, and more particularly to a polycarbonate resin composition having excellent light transmittance and dispersity and high flame retardancy.

Polycarbonate resin is a highly functional resin that has excellent physical properties such as impact resistance, heat resistance, weather resistance, and flame retardancy, and has high light transmittance. Utilizing these characteristics, for example, automobiles, electrical and electronic equipment, and housing It is widely used as a material for manufacturing parts in lighting equipment, optical applications and other industrial fields.
In particular, taking advantage of its excellent optical characteristics and flame retardancy, LED light sources have come to be used as a translucent cover member for lighting equipment, which is becoming mainstream in recent years.

Among them, members such as lighting covers, lighting signs, screens, various displays, display covers and lenses that use LEDs as light sources have the effect of spreading the lighting light by imparting light diffusivity, and reduce the lighting efficiency. It is required to maintain high light transmission so as not to prevent it. Further, since high flame retardancy is required for lighting members for offices and homes, polycarbonate resins containing various flame retardants and diffusing agents are used.

For example, Patent Document 1 proposes a polycarbonate resin composition containing an organometallic salt-based compound as a flame retardant, but the light transmittance, light diffusivity (dispersion degree), and flame retardancy are not always sufficient. I can't say that.

Japanese Unexamined Patent Publication No. 2014-125499

The present invention has been devised in view of the above problems, and provides a polycarbonate resin composition having excellent light transmittance and dispersity and high flame retardancy, and a lighting cover using the polycarbonate resin composition. The purpose is.

As a result of diligent studies to develop the above-mentioned excellent polycarbonate resin composition, the present inventors have conducted a silicone-based light diffusing agent, potassium trifluoromethanesulfonate, polytetrafluoroethylene, a specific stabilizer and a dye. We have found that a polycarbonate resin composition containing a combination of each of these in a specific amount solves the above-mentioned problems, and has reached the present invention.
The present invention relates to the following polycarbonate resin composition and a lighting cover using the polycarbonate resin composition.

[1] With respect to 100 parts by mass of (A) aromatic polycarbonate resin, (B) silicone-based light diffusing agent was 0.38 to 0.62 parts by mass, and (C) potassium trifluoromethanesulfonate was 0.038 to 0. 062 parts by mass, (D) polytetrafluoroethylene 0.075 to 0.125 parts by mass, (E) octadecyl 3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate 0.15 to A polycarbonate resin composition containing 0.50 parts by mass and further containing (F) Solvent Blue 97 and Solvent Violet 36 in a total amount of 0.1 to 0.3% by mass in the resin composition.
[2] The polycarbonate resin composition according to the above [1], wherein the (B) silicone-based light diffusing agent is polymethylsilsexquioxane.
[3] The above [1], wherein the (B) silicone-based light diffusing agent has a mass average particle size of 1 to 5 μm and a content of 0.39 to 0.60 parts by weight. Polycarbonate resin composition.
[4] The polycarbonate resin composition according to the above [1], wherein the content of the potassium trifluoromethanesulfonate (C) is 0.040 to 0.060 parts by mass.
[5] The content of the (D) polytetrafluoroethylene is 0.08 to 0.12 parts by mass, and the (E) octadecyl 3- (3,5-di-tert-butyl-4-hydroxyphenyl) The polycarbonate resin composition according to the above [1], wherein the content of propionate is 0.18 to 0.30 parts by mass.
[6] A lighting cover formed of the polycarbonate resin composition according to any one of the above [1] to [5].

The polycarbonate resin composition of the present invention has excellent light transmittance and dispersity, and has a high degree of flame retardancy.
Further, by creating a lighting cover using the polycarbonate resin composition and using it as a lighting fixture, the lighting fixture has excellent light extraction efficiency, no uneven brightness of the light emitting surface of the cover during lighting, and excellent combustion resistance. Can be provided.

Hereinafter, the present invention will be described in detail by showing embodiments and examples, but the present invention is not construed as being limited to the embodiments and examples shown below.

The polycarbonate resin composition of the present invention contains (A) 100 parts by mass of aromatic polycarbonate resin, (B) 0.38 to 0.62 parts by mass of a silicone-based light diffusing agent, and (C) potassium trifluoromethanesulfonate. 0.038 to 0.062 parts by mass, (D) 0.075 to 0.125 parts by mass of polytetrafluoroethylene, (E) Octadecyl 3- (3,5-di-tert-butyl-4-hydroxyphenyl) It is characterized by containing 0.15 to 0.50 parts by mass of propionate, and further containing (F) Solvent Blue 97 and Solvent Violet 36 in a total of 0.1 to 0.3% by mass in the resin composition.

[(A) Aromatic Polycarbonate Resin]
The polycarbonate resin composition of the present invention contains an aromatic polycarbonate resin (A).
The aromatic polycarbonate resin (A) is an aromatic polycarbonate polymer obtained by reacting an aromatic hydroxy compound with a diester of phosgene or carbonic acid. The aromatic polycarbonate polymer may have a branch. The method for producing the aromatic polycarbonate resin is not particularly limited, and conventional methods such as a phosgene method (interfacial polymerization method) and a melting method (transesterification method) can be used.

Typical examples of aromatic dihydroxy compounds include bis (4-hydroxyphenyl) methane, 2,2-bis (4-hydroxyphenyl) propane, and 2,2-bis (4-hydroxy-3-methylphenyl). ) Propane, 2,2-bis (4-hydroxy-3-t-butylphenyl) propane, 2,2-bis (4-hydroxy-3,5-dimethylphenyl) propane, 2,2-bis (4-hydroxy) -3,5-dibromophenyl) propane, 4,4-bis (4-hydroxyphenyl) heptane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 4,4'-dihydroxybiphenyl, 3,3', 5 , 5'-Tetramethyl-4,4'-dihydroxybiphenyl, bis (4-hydroxyphenyl) sulfone, bis (4-hydroxyphenyl) sulfide, bis (4-hydroxyphenyl) ether, bis (4-hydroxyphenyl) ketone And so on.

Among the aromatic dihydroxy compounds, 2,2-bis (4-hydroxyphenyl) propane (that is, bisphenol A) is particularly preferable.
Further, the aromatic dihydroxy compound may be used alone or in combination of two or more.

When producing the aromatic polycarbonate resin (A), a small amount of polyhydric phenol or the like having 3 or more hydroxy groups in the molecule may be added in addition to the aromatic dihydroxy compound. In this case, the aromatic polycarbonate resin has branches.
Examples of the polyhydric phenol having three or more hydroxy groups include fluoroglucolcin, 4,6-dimethyl-2,4,6-tris (4-hydroxyphenyl) heptene-2, 4,6-dimethyl-2,4. , 6-Tris (4-hydroxyphenyl) heptane, 2,6-dimethyl-2,4,6-tris (4-hydroxyphenyl) heptene-3, 1,3,5-tris (4-hydroxyphenyl) benzene, Polyhydroxy compounds such as 1,1,1-tris (4-hydroxyphenyl) ethane, or 3,3-bis (4-hydroxyaryl) oxyindole (ie, isatin bisphenol), 5-chloruisatin, 5,7- Examples thereof include dichlorousatin and 5-bromoisatin. Of these, 1,1,1-tris (4-hydroxyphenyl) ethane or 1,3,5-tris (4-hydroxyphenyl) benzene is preferable. The amount of the polyhydric phenol used is preferably 0.01 to 10 mol%, more preferably 0.1 to 2 mol%, based on the aromatic dihydroxy compound (100 mol%). Is.

In polymerization by the transesterification method, a carbonic acid diester is used as a monomer instead of phosgene. Typical examples of the carbonic acid diester include substituted diaryl carbonate typified by diphenyl carbonate, ditril carbonate and the like, dimethyl carbonate, diethyl carbonate, dialkyl carbonate typified by di-tert-butyl carbonate and the like. These carbonic acid diesters can be used alone or in admixture of two or more. Among these, diphenyl carbonate and substituted diphenyl carbonate are preferable.

Further, the above-mentioned carbonic acid diester may be replaced with a dicarboxylic acid or a dicarboxylic acid ester in an amount of preferably 50 mol% or less, more preferably 30 mol% or less. Typical dicarboxylic acids or dicarboxylic acid esters include terephthalic acid, isophthalic acid, diphenyl terephthalate, diphenyl isophthalate and the like. When a part of the carbonic acid diester is replaced with such a dicarboxylic acid or a dicarboxylic acid ester, a polyester carbonate is obtained.

When producing an aromatic polycarbonate resin by the transesterification method, a catalyst is usually used. The catalyst species are not limited, but generally, basic compounds such as alkali metal compounds, alkaline earth metal compounds, basic boron compounds, basic phosphorus compounds, basic ammonium compounds, and amine compounds are used. Of these, alkali metal compounds and / or alkaline earth metal compounds are particularly preferable. These may be used alone or in combination of two or more. In the transesterification method, it is common to inactivate the catalyst with a p-toluenesulfonic acid ester or the like.

The preferable molecular weight of the aromatic polycarbonate resin (A) is 18,000 to 50,000 in terms of viscosity average molecular weight [Mv]. If the viscosity average molecular weight is less than 18,000, the mechanical strength is not sufficient, and if the viscosity average molecular weight exceeds 50,000, the fluidity is poor and the moldability tends to be poor. The viscosity average molecular weight is more preferably 19,000 or more, still more preferably 20,000 or more, particularly preferably 21,000 or more, still more preferably 45,000 or less, still more preferably 40,000 or less. , Especially preferably 36,000 or less, and most preferably 33,000 or less.

In the present invention, the viscosity average molecular weight (Mv) of the polycarbonate resin is determined by using methylene chloride as a solvent and using an Ubbelohde viscometer to determine the ultimate viscosity [η] (unit: dl / g) at a temperature of 20 ° C. It is a value calculated from the following Schnell viscosity formula.
[Η] = 1.23 × 10 ^-4 Mv ^0.83

[(B) Silicone light diffusing agent]
The polycarbonate resin composition of the present invention contains (B) a silicone-based light diffusing agent. By containing a silicone-based light diffusing agent, the light diffusing property of the resin composition and the molded product obtained by molding the resin composition can be enhanced.

(B) Examples of the silicone-based light diffusing agent include particles of a silicone-based resin. In particular, fine particles of silicone resin are preferable.

Examples of the fine particles of the silicone-based resin include crosslinked silicone resin fine particles, silicone rubber powder obtained by coating silicone rubber with silicone resin, and the like. Among them, silicone resin fine particles are preferable, polyorganosylsesquioxane particles are more preferable, and polymethylsilsekisquioxane particles are particularly preferable from the viewpoint of excellent thermal stability.

The mass average particle size of the silicone-based light diffusing agent (B) is usually 0.5 μm or more, preferably 1 μm or more, more preferably 1.5 μm or more, and usually 30 μm or less, preferably 20 μm or less, more preferably. It is 10 μm or less, more preferably 5 μm or less, and particularly preferably 3 μm or less. If the mass average particle size is too small, the light diffusivity of the obtained polycarbonate resin composition is inferior, and when used as a lighting fixture member or the like, the light source tends to show through or the visibility is inferior. If it is too much, the diffusion effect on the content may be reduced.

As the (B) silicone-based light diffusing agent, one type may be used, or two or more types may be used in combination in any combination and ratio.

The content of the silicone-based light diffusing agent (B) is 0.38 to 0.62 parts by mass with respect to 100 parts by weight of the (A) polycarbonate resin. The content is preferably 0.39 parts by mass or more, more preferably 0.40 parts by mass or more, preferably 0.61 parts by mass or less, and more preferably 0.60 parts by mass or less.

[(C) Potassium trifluoromethanesulfonate]
The polycarbonate resin composition of the present invention contains (C) potassium trifluoromethanesulfonate. By containing (C) potassium trifluoromethanesulfonate, the formation of a carbonized layer during combustion of the polycarbonate resin composition of the present invention can be promoted, the flame retardancy can be further enhanced, and (A) the polycarbonate resin itself can be used. It is possible to maintain good mechanical properties such as impact resistance, heat resistance, and electrical properties.

The content of (C) potassium trifluoromethanesulfonate in the polycarbonate resin composition of the present invention is 0.038 to 0.062 parts by mass, preferably 0.039 with respect to 100 parts by mass of the (A) polycarbonate resin. It is more than parts by mass, more preferably 0.040 parts by mass or more, and preferably 0.061 parts by mass or less, more preferably 0.060 parts by mass or less. (C) If the content of potassium trifluoromethanesulfonate is too small, the flame retardancy of the obtained polycarbonate resin composition becomes insufficient, and conversely, if it is too large, the thermal stability and hydrolysis resistance of the polycarbonate resin deteriorate. It is easy to cause a poor appearance of the molded product and a decrease in mechanical strength.

[(D) Polytetrafluoroethylene]
The polycarbonate resin composition of the present invention further contains (D) polytetrafluoroethylene.

The polytetrafluoroethylene (D) preferably has a fibril-forming ability, and the fibril-forming ability tends to significantly improve the drip-preventing property during combustion.

Further, as (D) polytetrafluoroethylene, polytetrafluoroethylene coated with an organic polymer can also be preferably used. By using the organic polymer-coated polytetrafluoroethylene, the dispersibility is improved, the surface appearance of the molded product is improved, and foreign substances on the surface can be suppressed.
The organic polymer-coated polytetrafluoroethylene can be produced by various known methods. For example, (1) a polytetrafluoroethylene particle aqueous dispersion and an organic polymer particle aqueous dispersion are mixed and coagulated or spray-dried. (2) Polytetrafluoroethylene particles In the presence of an aqueous dispersion, the monomers constituting the organic polymer are polymerized and then coagulated or spray-dried to produce powder. Method, (3) Emulsion polymerization of a monomer having an ethylenically unsaturated bond in a dispersion liquid obtained by mixing an aqueous dispersion of polytetrafluoroethylene particles and an aqueous dispersion of organic polymer particles, and then coagulation or spraying. Examples thereof include a method of producing powder by drying.

As the monomer for producing an organic polymer that coats polytetrafluoroethylene, a monomer having a high affinity with the polycarbonate resin is preferable from the viewpoint of dispersibility when blended with the polycarbonate resin, and aromatic vinyl. More preferred are based monomers, (meth) acrylic acid ester-based monomers, and vinyl cyanide-based monomers.

As the (D) polytetrafluoroethylene, one type may be used, or two or more types may be used in any combination and in any ratio.

The content of (D) polytetrafluoroethylene is 0.075 to 0.125 parts by mass, and more preferably 0.080 to 0.120 parts by mass with respect to 100 parts by mass of the (A) polycarbonate resin.

[(E) Octadecyl 3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate]
The polycarbonate resin composition of the present invention contains (E) octadecyl 3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate as a stabilizer.

The content of (E) octadecyl 3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate is 0.15 to 0.50 parts by mass with respect to 100 parts by mass of the (A) polycarbonate resin. Yes, more preferably 0.18 to 0.30 parts by mass. If the content of the phenolic stabilizer is less than the lower limit of the above range, the effect as the phenolic stabilizer is insufficient, and if the content of the phenolic stabilizer exceeds the upper limit of the above range, the effect is effective. It will reach a plateau and become uneconomical.

The polycarbonate resin composition of the present invention preferably contains tris (2,4-di-tert-butylphenyl) phosphite in addition to the above component (E). The content of tris (2,4-di-tert-butylphenyl) phosphite is preferably 0.02 to 0.04 parts by mass with respect to 100 parts by mass of the polycarbonate resin (A).

[(F) Solvent Blue 97 and Solvent Violet 36]
The polycarbonate resin composition of the present invention contains (F) Solvent Blue 97 and Solvent Violet 36 as brewing dyes that exhibit blue to purple by absorbing orange to yellow light rays.

Specific examples of the dye having a generic name of Solvent Blue 97 include the trade name "Macrolex Blue RR" manufactured by LANXESS Co., Ltd.
Further, as the dye whose common name is Solvent Violet 36, a trade name "Macrolex Violet 3R" manufactured by LANXESS Co., Ltd. can be specifically mentioned.

The contents of (F) Solvent Blue 97 and Solvent Violet 36 are 0.1 to 0.3 mass ppm in total in the resin composition. If the content is not 0.1 mass ppm or more, the yellowish appearance of the hue cannot be improved, and if it exceeds 0.3 mass ppm, the brightness (illuminance) when the LED lighting cover or the like is used tends to decrease.

[Other ingredients]
The polycarbonate resin composition of the present invention may contain other components in addition to those described above, if necessary, as long as the desired physical properties are not significantly impaired. Examples of other components include resins other than polycarbonate resin, various resin additives other than the above, and the like. In addition, 1 type may be contained in the other component, and 2 or more types may be contained in arbitrary combinations and ratios.

<Other resins>
Examples of other resins include thermoplastic polyester resins such as polyethylene terephthalate resin, polytrimethylene terephthalate, and polybutylene terephthalate resin; polystyrene resin, high impact polystyrene resin (HIPS), acrylonitrile-styrene copolymer (AS resin), and the like. Examples thereof include styrene resins; polyolefin resins such as polyethylene resins and polypropylene resins; polyamide resins; polyimide resins; polyetherimide resins; polyurethane resins; polyphenylene ether resins; polyphenylene sulfide resins; polysulfone resins; polymethacrylate resins and the like.
In addition, 1 type may be contained in the other resin, and 2 or more types may be contained in arbitrary combinations and ratios.

When a resin other than the (A) polycarbonate resin is contained, the content thereof is preferably 20 parts by mass or less, more preferably 10 parts by mass or less, based on 100 parts by mass of the (A) polycarbonate resin. Further, it is preferably 5 parts by mass or less, particularly preferably 3 parts by mass or less.

<Resin additive>
Examples of the resin additive include an ultraviolet absorber, a fluorescent whitening agent, a mold release agent, an antistatic agent, an antifogging agent, an antiblocking agent, a fluidity improving agent, a plasticizer, a dispersant, an antibacterial agent and the like. .. In addition, 1 type may be contained in the resin additive, and 2 or more types may be contained in arbitrary combinations and ratios.

[Manufacturing of Polycarbonate Resin Composition]
The method for producing the polycarbonate resin composition of the present invention is not limited, and a known method for producing the polycarbonate resin composition can be widely adopted, and the above-mentioned essential components (A) to (F) and, if necessary, blended. After mixing the other components to be prepared in advance using various mixers such as a tumbler and a Henschel mixer, a mixer such as a Banbury mixer, a roll, a brabender, a single-screw kneading extruder, a twin-screw kneading extruder, or a kneader Examples thereof include a method of melt-kneading.

Further, for example, the polycarbonate resin composition can be produced without premixing each component or by premixing only a part of the components and supplying the components to an extruder using a feeder for melt-kneading. ..
Further, for example, a resin composition obtained by mixing some components in advance, supplying them to an extruder, and melt-kneading the resin composition is used as a masterbatch, and the masterbatch is mixed with the remaining components again and melt-kneaded. Polycarbonate resin compositions can also be produced.
Further, for example, when a component that is difficult to disperse is mixed, the component that is difficult to disperse is dissolved or dispersed in a solvent such as water or an organic solvent in advance and kneaded with the solution or dispersion to disperse. It can also enhance the sex.

[Molding]
The polycarbonate resin composition of the present invention is molded into a lighting cover.
As a method for manufacturing the lighting cover, a molding method generally used for the polycarbonate resin composition can be arbitrarily adopted. For example, an injection molding method, an ultra-high speed injection molding method, an injection compression molding method, a two-color molding method, a hollow molding method such as gas assist, a molding method using a heat insulating mold, and a rapid heating mold were used. Molding method, foam molding (including supercritical fluid), insert molding, IMC (in-mold coating molding) molding method, extrusion molding method, sheet molding method, thermal molding method, rotary molding method, laminated molding method, press molding method, A blow molding method and the like can be mentioned, and a molding method using a hot runner method can also be used.
Among these, injection molding methods such as an injection molding method, an ultra-high speed injection molding method, and an injection compression molding method are preferable.

Examples of the lighting cover of the polycarbonate resin composition of the present invention include various translucent parts having an arbitrary shape, and can be particularly preferably used for various lighting covers for LED lighting and the like.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the present invention is not construed as being limited to the following examples.
In the following description, [part] means "part by mass" based on the mass standard unless otherwise specified.

The components used in Examples and Comparative Examples are as shown in Table 1 below.

(Examples 1 to 9, Comparative Examples 1 to 10)
[Manufacturing resin pellets]
Each component listed in Table 1 was blended so as to have a ratio shown in Table 3 and below (all indicated by parts by mass), and mixed uniformly with a tumbler mixer to obtain a mixture. This mixture is supplied to a twin-screw extruder (“TEM26SX” manufactured by Toshiba Machine Co., Ltd.), kneaded under the conditions of a screw rotation speed of 150 rpm, a discharge rate of 20 kg / hour, and a barrel temperature of 280 ° C. It was. The extruded product was rapidly cooled in a water tank, cut using a pelletizer and pelletized to obtain pellets of a polycarbonate resin composition.

[Initial hue]
The pellets of the resin composition obtained above were injection-molded using an injection molding machine J50 manufactured by Japan Steel Works under the conditions of a resin temperature of 280 ° C. and a mold temperature of 80 ° C., and the length was 90 mm, the width was 50 mm, and the meat was meat. A three-stage plate having a thickness of 1 mm, 2 mm and 3 mm was obtained as a test piece.
The hue of this plate was visually evaluated under a D65 light source according to the following criteria.
○ ・ ・ ・ Hue is good △ ・ ・ ・ Slight yellowing × ・ ・ ・ Clearly yellowing

[Total light transmittance]
Using the 3-stage plate prepared for the initial hue as the test piece, using the haze meter "NDH-4000" manufactured by Nippon Denshoku Kogyo Co., Ltd., based on ASTM-D1003, using the D65 light source, the entire test piece in 1 mm thick part. The light transmittance was measured.

[Dispersity]
Using the 3-stage plate prepared for the initial hue as a test piece, and using "GP-5" GONIOPHOTOMETER manufactured by MURAKAMI COLOR RESEARCH LABORALTORY, incident light: 0 °, fanning angle: 0 °, light receiving range: 0 ° to 90 °, The brightness with a thickness of 1 mm was measured under the conditions of a luminous flux aperture: 2.0 and a light receiving aperture: 3.0, and the angle at which the brightness was halved with respect to the brightness of 0 ° was determined as the degree of dispersion (°).

[Flame retardance]
The pellets of the resin composition obtained above were injection-molded using an injection molding machine "SE100DU" manufactured by Sumitomo Heavy Industries, Ltd. under the conditions of a resin temperature of 300 ° C. and a mold temperature of 80 ° C., and had a length of 127 mm. UL test test pieces having a width of 12.7 mm and a wall thickness of 0.8 mm were obtained.
The obtained UL test test piece was conditioned for 48 hours in a high temperature room at 23 ° C and 50% relative humidity, and the UL94 test (plastic for equipment parts) specified by the US Underwriters Laboratories (UL). The test was carried out in accordance with the material combustion test).
UL94V is a method for evaluating flame retardancy from the residual flame time and drip property after indirect flame of a burner flame for 10 seconds on a test piece held vertically, and V-0, V-1 and V-2. In order to have the flame retardancy of, it is necessary to meet the criteria shown in Table 2 below.

The obtained UL test test piece is humidity-controlled for 48 hours in a high temperature room at 23 ° C. and 50% relative humidity, and the UL94 test (plastic for equipment parts) specified by the US Underwriters Laboratories (UL). The test was carried out in accordance with the material combustion test).
The flammability results were V-0, V-1, V-2, and HB in order of preference, and nonstandard ones were classified as NG. In addition, the total residual flame time of 5 samples and the number of cotton ignitions by drip are described.

[LED bulb total luminous flux]
Each resin composition obtained in Examples and Comparative Examples was injection-molded using an injection molding machine SE100DU manufactured by Sumitomo Heavy Industries, Ltd. under the conditions of a resin temperature of 300 ° C. and a mold temperature of 80 ° C., and a radius of 25. A hemispherical molded product having a hemisphere of 5 mm and a thickness of 1 mm was obtained.
Remove the lighting cover of a commercially available LED bulb (PANASONIC, EVERLEDS LDA7D-G), attach the hemispherical molded product, and measure the total luminous flux to the total luminous flux spectroscopic measurement system CSLMS-2021 (integrating sphere 20 inches, It was measured by a spectroscope CDS-2100).

[LED bulb grain feeling]
Using the LED bulb and the hemispherical molded product used in the above total luminous flux measurement, the appearance of the LED chip when the LED bulb was lit was visually evaluated.
○ ・ ・ ・ LED chip is not visible and light is diffused uniformly △ ・ ・ ・ Slightly shaded light × ・ ・ ・ The position of the chip is clearly known

The above evaluation results are shown in Tables 3 to 4 below. In the table, Example n is referred to as “actual n”, and Comparative Example n is referred to as “ratio n”.

Since the polycarbonate resin composition of the present invention is a polycarbonate resin material having excellent light transmittance and dispersity and high flame retardancy, it can be widely and suitably used for various lighting parts and the like, and has industrial applicability. Very expensive.

Claims (6)

(A) 0.38 to 0.62 parts by mass of a silicone-based light diffusing agent and 0.038 to 0.062 parts by mass of (C) potassium trifluoromethanesulfonate with respect to 100 parts by mass of an aromatic polycarbonate resin , (D) Polytetrafluoroethylene 0.075 to 0.125 parts by mass, (E) Octadecyl 3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate 0.15 to 0.50 A polycarbonate resin composition containing parts by mass, and further containing (F) Solvent Blue 97 and Solvent Violet 36 in a total of 0.1 to 0.3% by mass in the resin composition. The polycarbonate resin composition according to claim 1, wherein the silicone-based light diffusing agent (B) is polymethylsilsexquioxane. The polycarbonate resin composition according to claim 1, wherein the silicone-based light diffusing agent (B) has a mass average particle size of 1 to 5 μm and a content of 0.39 to 0.60 parts by weight. Stuff. The polycarbonate resin composition according to claim 1, wherein the content of (C) potassium trifluoromethanesulfonate is 0.040 to 0.060 parts by mass. The content of the (D) polytetrafluoroethylene is 0.08 to 0.12 parts by mass, and the content of the (E) octadecyl 3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate is The polycarbonate resin composition according to claim 1, wherein the content is 0.18 to 0.30 parts by mass. A lighting cover formed of the polycarbonate resin composition according to any one of claims 1 to 5.