JP2006176630A - Polycarbonate resin composition and molded article using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polycarbonate resin composition which exhibits a good flame retardance and an excellent light reflection and molded articles obtained from the resin composition such as a light reflection plate and its frame. <P>SOLUTION: The polycarbonate resin composition is obtained by blending 1-150 pts.wt. of (b) a glass filler, 3-50 pts.wt. of (c) titanium dioxide and 0.01-5 pts.wt. of (d) at least one kind of flame retardant selected from alkali metal salts or alkaline earth metal salts of perfluoroalkane disulphonimide compounds to 100 pts.wt. of (a) an aromatic polycarbonate resin. The molded articles are produced from the resin composition. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a polycarbonate resin composition and a molded article using the same. More specifically, a polycarbonate resin composition capable of producing a molded product that exhibits good flame retardancy and at the same time exhibits excellent light reflection characteristics without blending a flame retardant having halogens or phosphorus, and this resin The present invention relates to a molded article such as a light reflector obtained from the composition or a frame material thereof.

Polycarbonate resins have excellent mechanical properties and are widely used in the automotive field, OA equipment field, electrical / electronic field, and the like. In recent years, in display devices for computers such as TFTs or televisions, there are display devices that require high light reflection characteristics such as backlights for liquid crystal display devices, illuminated push switches, and light reflection plates for photoelectric switches. It is becoming common. Various resin compositions in which a white pigment such as titanium oxide is added to a polycarbonate resin have been proposed as a material for producing a light reflector.

For example, a polycarbonate resin as a base resin is mixed with titanium oxide treated with a specific substance, a specific silicon compound, and a mixture of a specific organophosphate diester and an alkali metal salt of a specific organophosphate diester. However, a flame retardant polycarbonate resin composition that can provide a molded article having excellent light reflection characteristics has been proposed (see Patent Document 1). However, according to experiments by the present inventors, the resin described in this publication The appearance of the molded product obtained from the composition was yellowish and had a low light reflectance, and the light reflection characteristics were not sufficient.

In recent years, from the viewpoint of safety, resin materials used for manufacturing electrical components have been required to have flame retardancy, and have high flame retardancy as defined by UL standards and dripping of combustion products. It is required that it does not occur. Conventionally, in order to make a polycarbonate resin flame retardant, a flame retardant mainly using a bromine-based compound or a bromine-based compound in combination with antimony trioxide has been used. However, such resin compositions have problems such as environmental pollution due to bromine gas generated during combustion, work environment pollution problems, and those containing bromine-based compounds such as slightly inferior thermal stability. There is a need for a flame-retarding technique using a non-halogen compound containing no halogen. As non-halogen flame retardants, phosphate ester compounds are known. However, when a phosphoric acid ester compound is blended, it has the disadvantages of reducing the heat resistance such as mechanical strength and deflection temperature under load, which are excellent properties of polycarbonate resin, and it can completely solve the problem of environmental pollution. Absent.

In Patent Document 2, a composition in which titanium oxide and a phosphate ester flame retardant having a specific structure are blended with a polycarbonate resin, a small amount of flame retardant is blended due to a synergistic effect of titanium oxide and phosphate ester flame retardant. Therefore, it is described that it exhibits an excellent flame retardant effect, has little decrease in mechanical strength and heat resistance, and is suitable as a raw material for producing a light reflector. On the other hand, backlight LCD frames, etc., tend to be thinner and lighter in recent years, use non-brominated flame retardants, have excellent heat-reflective properties without deterioration in heat resistance, and have strength and rigidity. There is a need for excellent resin materials. In order to improve the rigidity of the polycarbonate resin, a method of blending an inorganic filler such as glass fiber is known, but in a resin composition blended with an inorganic filler, the amount described in Patent Document 2 Even if the titanium oxide and phosphoric acid ester compound are mixed, it is not possible to obtain a molded product that is sufficiently flame retardant. If the amount of the flame retardant is increased for the purpose of improving flame retardancy, The mechanical strength and heat resistance of the product are reduced.

Patent Document 3 discloses a flame retardant resin composition containing an alkali metal salt or alkaline earth metal salt of a perfluorodisulfonic acid compound.
JP-A-6-207092 Japanese Patent Laid-Open No. 10-1600 JP 2003-246986 A

The object of the present invention is as follows.
1. To provide a polycarbonate resin composition that exhibits excellent flame retardancy without using a bromine-based compound that causes environmental pollution, work environment pollution problems, and performance degradation as a flame retardant.
2. Provided is a polycarbonate resin composition that is excellent in moldability and that provides a molded product excellent in various properties such as mechanical strength such as rigidity, light shielding properties, light reflection properties, surface appearance, and dimensional stability.
3. To provide a polycarbonate resin composition suitable for production of a molded product that is required to be thin and light, such as a lighting device, a liquid crystal display backlight reflector, an optical switch reflector, or a frame material thereof. .
4). To provide a molded product excellent in light reflection characteristics such as a thinned and lightened lighting device, a liquid crystal display backlight reflecting plate, an optical switch reflecting plate, or a frame material thereof.

In order to solve the above problems, the present invention provides (a) 100 parts by weight of an aromatic polycarbonate resin, (b) 1 to 150 parts by weight of a glass filler, and (c) 3 to 50 parts by weight of titanium oxide. And (d) at least one flame retardant selected from alkali metal salts or alkaline earth metal salts of perfluoroalkanedisulfonimide compounds represented by the following general formula (I) or general formula (II): Provided is a polycarbonate resin composition comprising ˜5 parts by weight.

In the second invention, a molded product is provided, which is manufactured using the polycarbonate resin composition according to the first invention as a raw material.

The present invention is as described in detail below, has the following particularly advantageous effects, and its industrial utility value is extremely great. 1. The polycarbonate resin composition according to the present invention is a polycarbonate resin composition that exhibits excellent flame retardancy and is flame-retardant with a non-bromine compound. 2. Since the polycarbonate resin composition according to the present invention exhibits excellent flame retardancy without using a bromine-based flame retardant or a phosphorus-based flame retardant, problems of environmental pollution and work environment pollution do not occur. 3. The polycarbonate resin composition according to the present invention is excellent not only in flame retardancy but also in moldability, etc., and in various properties such as mechanical strength such as rigidity, light shielding properties, light reflection characteristics, surface appearance, and dimensional stability. 3. A molded product is obtained. The polycarbonate resin composition according to the present invention is suitable as a raw material for producing a molded product that is required to be thin and light, such as a lighting device, a liquid crystal display backlight reflector, an optical switch reflector, or a frame material thereof. . 5. A molded article using the polycarbonate resin composition according to the present invention as a molding material exhibits excellent mechanical strength, light shielding properties, light reflection characteristics, and dimensional stability while being thin and lightweight.

Hereinafter, the present invention will be described in detail. In the resin composition according to the present invention, (a) an aromatic polycarbonate resin (sometimes simply referred to as a polycarbonate resin) as a base resin is an aromatic hydroxy compound, a small amount thereof, and phosgene or It may be a branched thermoplastic aromatic polycarbonate polymer or copolymer obtained by reacting with carbonic acid diester or the like. The method for producing the polycarbonate resin is not particularly limited, and can be produced by a conventionally known method such as a phosgene method (interfacial polymerization method) or a melting method (transesterification method). Furthermore, the aromatic polycarbonate resin which adjusted the amount of terminal OH groups manufactured by the melting method may be sufficient.

The starting aromatic dihydroxy compound is 2,2-bis (4-hydroxyphenyl) propane (= bisphenol A), tetramethylbisphenol A, bis (4-hydroxyphenyl) -p-diisopropylbenzene, hydroquinone, resorcinol, 4, 4-dihydroxydiphenyl and the like can be mentioned. Of these, bisphenol A is preferred. Further, for the purpose of further improving the flame retardancy, which is also the object of the present invention, a compound in which one or more tetraalkylphosphonium sulfonates are bonded to the aromatic dihydroxy compound may be used.

In order to obtain a branched polycarbonate resin, phloroglucin, 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, 1,1,1-tris Polyhydroxy compounds such as (4-hydroxyphenyl) ethane, or 3,3-bis (4-hydroxyaryl) oxindole (= isatin bisphenol), 5-chloruisatin, 5,7-dichlorouisatin, 5-bromoisatin and the like. The aromatic dihydroxy compound may be used in place of a part thereof. The usage-amount in that case is 0.01-10 mol% of total aromatic dihydroxy compounds, Preferably it is 0.1-2 mol%.

The polycarbonate resin is preferably derived from 2,2-bis (4-hydroxyphenyl) propane, or from 2,2-bis (4-hydroxyphenyl) propane and other aromatic dihydroxy compounds. And a copolymer obtained by copolymerizing a polymer or oligomer having a siloxane structure. The polycarbonate resin of the substrate may be a mixture of two or more resins having different compositions.

In order to adjust the molecular weight of the polycarbonate resin, a monovalent aromatic hydroxy compound may be used. Examples of monovalent aromatic hydroxy compounds include m- or p-methylphenol, m- or p-propylphenol, pt-butylphenol, and p-long chain alkyl-substituted phenol. The molecular weight of the polycarbonate resin is preferably 16,000 to 30,000, more preferably 17,000 to 25,000 in terms of viscosity average molecular weight converted from the solution viscosity measured at a temperature of 25 ° C. using methylene chloride as a solvent. .

In the resin composition according to the present invention, (b) the glass filler improves the rigidity, dimensional stability and the like of a molded product obtained from the polycarbonate resin composition. (B) Glass fillers include glass fibers, glass flakes, and glass beads, and these can be used alone or in combination of two or more. The blending amount of the glass filler is selected in the range of 1 to 150 parts by weight with respect to 100 parts by weight of the polycarbonate resin of the base. If the blending amount of the glass filler is less than 1 part by weight, the reinforcing effect is insufficient, and if it exceeds 150 parts by weight, the moldability and the flame retardancy are difficult, so both are not preferable. The blending amount of the glass filler is preferably 5 to 120 parts by weight, and more preferably 9 to 100 parts by weight.

A glass filler consists of glass compositions, such as A glass, C glass, and E glass, and since E glass (an alkali free glass) does not have a bad influence on polycarbonate resin especially, it is preferable. Glass fiber refers to a fiber having a fiber-like outer shape with a cross-sectional shape cut at right angles to the length direction and having a perfect circle or polygonal shape. The glass fiber has an average fiber diameter of 1 to 25 μm, preferably 5 to 17 μm. When the average fiber system is less than 1 μm, the moldability of the resin composition is impaired, and when the average fiber system exceeds 25 μm, the appearance of the molded product is impaired and the reinforcing effect is not sufficient. The glass fiber may be a single fiber or a plurality of single fibers twisted together. As for the form of the glass fiber, “glass roving” continuously wound up of single fibers or twisted ones, “chopped strand” trimmed to a length of 1 to 10 mm, and pulverized to a length of about 10 to 500 μm. Any of "Mildo fiber" etc. may be sufficient. Such glass fibers are commercially available from Asahi Fiber Glass Co., Ltd. under the trade names “Glasslon Chopped Strand” and “Glasslon Milled Fiber”, and are easily available. Glass fibers having different forms can be used in combination.

The glass beads are spherical ones having an outer diameter of 10 to 100 μm, and are commercially available, for example, from Potters Barotini under the trade name “EGB731” and are easily available. Further, the glass flake is a flake shape having a thickness of 1 to 20 μm and a length of one side of 0.05 to 1 mm, and is commercially available, for example, under the trade name “Fureka” from Nippon Sheet Glass Co., Ltd. Are readily available. These (a) glass fillers are surface-treated with, for example, a silane compound, an epoxy compound, a urethane compound, etc., in order to improve the affinity with the base resin unless the properties of the resin composition according to the present invention are impaired. Or may be oxidized.

In the resin composition according to the present invention, (c) titanium oxide functions to improve the whiteness, light-shielding property, and light reflection property of a molded product obtained from the polycarbonate resin composition. The production method, crystal form, average particle size, and the like of titanium oxide are not particularly limited. Titanium oxide may be produced by either the sulfuric acid method or the chlorine method. Among these, titanium oxide produced by a chlorine method is preferable. Titanium oxide produced by the chlorine method is superior in terms of whiteness compared to titanium oxide produced by the sulfuric acid method. The crystal form of titanium oxide includes a rutile type and an anatase type, but a rutile type titanium oxide is preferable, and is superior in terms of whiteness, light reflection characteristics, and weather resistance as compared with anatase type titanium oxide. The particle diameter of titanium oxide is preferably 0.05 to 0.5 μm. If the particle diameter is less than 0.05 μm, the light shielding properties and light reflection properties tend to be inferior. If the particle diameter exceeds 0.5 μm, the light shielding properties and light reflection properties tend to be inferior, and the surface of the molded product is likely to be rough, and the impact may be It tends to cause a decrease in strength. The particle diameter of titanium oxide is more preferably 0.15 to 0.35 μm.

Commercially available titanium oxide is usually surface-treated with inorganic compounds that are water-containing compounds such as alumina, silica, and zirconia from the viewpoint of light resistance and ease of handling. 2 to 5% by weight. However, when the amount of surface treatment increases, particularly when the amount of the silica component in titanium oxide increases, the adsorbed water contained in the surface treatment layer of the inorganic compound causes poor appearance of the molded product obtained from the resin composition, or Problems such as dripping during combustion occur. These problems can be improved by reducing the amount of surface treatment with the inorganic compound of titanium oxide or not treating it. Accordingly, the surface treatment with an inorganic compound of titanium oxide is preferably a treatment with alumina, zirconia, or the like, and even when silica is used in combination with other inorganic substances, it is preferable that the treatment amount is small. The amount of the surface treatment with the inorganic compound is preferably 4% by weight or less, more preferably 3% by weight or less, and particularly preferably 2.5% by weight or less, and oxidation without performing the surface treatment with the inorganic compound. Titanium is most preferred. When the amount of the surface treatment with the inorganic compound is reduced, the residence heat stability and the appearance are improved. In the case of performing a surface treatment with an inorganic compound, the treatment method is not particularly limited, and any method can be used.

Titanium oxide is preferably subjected to a surface treatment with an organic compound for the purpose of improving thermal stability, uniform dispersibility of the base resin in the polycarbonate resin composition, and stability of the dispersed state. Examples of the surface treating agent for an organic compound include an alkoxy group, an epoxy group, an amino group, an organic silane compound having an Si—H bond, or an organic silicone compound. Particularly preferred is hydrogen polysiloxane (a silicone compound having a Si—H bond). The surface treatment amount with an organic compound is 1 to 5% by weight, preferably 1.5 to 3% by weight, based on titanium oxide.

The blending amount of titanium oxide is selected in the range of 3 to 50 parts by weight with respect to 100 parts by weight of the polycarbonate resin. If the blending amount of titanium oxide is less than 3 parts by weight, the light reflection property of the molded product selected from the resin composition according to the present invention tends to be insufficient, and if it exceeds 50 parts by weight, the impact property becomes insufficient. There is a possibility of adversely affecting the appearance, and neither is preferable. A preferable titanium oxide content is 4 to 30 parts by weight with respect to 100 parts by weight of the polycarbonate resin, and more preferably 5 to 20 parts by weight. In addition, the titanium oxide compounding amount means a weight including these treatment agents when titanium oxide is pretreated with an inorganic substance or surface-treated with an organic compound.

The metal salt of (d) perfluoroalkanedisulfonimide compound in the resin composition according to the present invention functions to improve the flame retardancy of the resin composition. (D) The metal salt of the perfluoroalkanedisulfonimide compound is one having a cyclic structure represented by the following general formula (I) or general formula (II).

In the general formula (I) and general formula (II), examples of the alkali metal and alkaline earth metal represented by M include sodium, lithium, potassium, rubidium, cesium, beryllium, magnesium, calcium, strontium and barium. .

Specific examples of the compound represented by the general formula (I) include bis (perfluoroethane) disulfonimide, bis (perfluoropropane) disulfonimide, bis (perfluorobutane) disulfonimide, and bis (perfluoropentane) disulfonimide. And salts such as bis (perfluorohexane) disulfonimide. Among these, salts of bis (perfluoropropane) disulfonimide and bis (perfluorobutane) disulfonimide are more preferable from the viewpoint of compatibility with the polycarbonate resin and imparting flame retardancy.

Specific examples of the compound represented by the general formula (II) include cyclic perfluoroethanedisulfonimide, cyclic 1,3-perfluoropropane disulfonimide, cyclic 1,4-perfluorobutanedisulfonimide, and cyclic 1,5-par. Examples thereof include salts such as fluoropentanedisulfonimide. Among these, a salt of cyclic 1,3-perfluoropropane disulfonimide is more preferable from the viewpoint of compatibility with the polycarbonate resin and imparting flame retardancy.

The blending amount of the metal salt of perfluoroalkanedisulfonimide is selected in the range of 0.01 to 5 parts by weight with respect to 100 parts by weight of the polycarbonate resin of the substrate. When the blending amount of the perfluoroalkanedisulfonimide salt is less than 0.01 parts by weight, the resin composition hardly exhibits sufficient flame retardancy, and when it exceeds 5 parts by weight, the thermal stability of the resin composition decreases. It is easy and neither is preferable. The preferable amount of perfluoroalkanedisulfonimide salt is 0.02 to 3 parts by weight, and more preferably 0.03 to 2 parts by weight.

The resin composition according to the present invention contains (b) a glass filler, (c) titanium oxide, and (d) a metal salt of perfluoroalkanedisulfonimide with respect to a predetermined amount of (a) aromatic polycarbonate resin. The composition is excellent in flame retardancy, strength such as rigidity, light shielding properties, dimensional stability and the like. However, the appearance defect peculiar to the reinforced resin material that the glass filler is raised on the surface of the molded product tends to occur. For the purpose of suppressing such poor appearance, it is preferable to further blend (e) an aromatic polycarbonate oligomer with the composition containing the above four components. (E) The aromatic polycarbonate oligomer preferably has a repeating unit represented by the following general formula (III) and has a viscosity average molecular weight of 1,000 to 10,000. When the molecular weight is less than 1,000, the mechanical strength is lowered, and when it exceeds 10,000, the appearance improving effect is small. The viscosity average molecular weight of the oligomer is more preferably 2,000 to 8,000.

The (e) aromatic polycarbonate oligomer includes 2,2-bis (4-hydroxyphenyl) propane, 2,2-bis (4-hydroxy-3,5-dimethylphenyl) propane, 2,2-bis (4- Reaction of aromatic dihydric phenolic compounds represented by hydroxy-3,5-dibromophenyl) propane with carbonate precursors represented by phosgene, and transesterification reaction of aromatic dihydric phenol with diphenyl carbonate, etc. Obtained by. The aromatic dihydric phenol compound may be a single type or a mixture of two or more types.

In order to adjust the degree of polymerization of the above (e) aromatic polycarbonate oligomer, in the interfacial polymerization method using phosgene, phenol and / or alkyl-substituted phenol may be added to the polymerization system to end-clamp. The blending amount of the aromatic polycarbonate oligomer varies depending on the type and physical properties of the (b) glass filler to be blended, but if the blending amount exceeds 50 parts by weight, the strength and heat resistance are reduced, so that 100 parts by weight of the polycarbonate resin of the substrate On the other hand, it is preferable to select 1 to 50 parts by weight. Among these, 2 to 30 parts by weight is preferable, and 4 to 20 parts by weight is particularly preferable.

The resin composition according to the present invention preferably contains (f) a fluorinated polyolefin for the purpose of imparting anti-dripping properties. The fluorinated polyolefin refers to a polymer having a structure in which all or most of the hydrogen atoms of the polyolefin are substituted with fluorine atoms. Specific examples include polytetrafluoroethylene, a copolymer of tetrafluoroethylene and propylene hexafluoride, and among them, polytetrafluoroethylene is preferable. Examples of the polytetrafluoroethylene include polytetrafluoroethylene having a fibril-forming ability, that is, polytetrafluoroethylene having a tendency to bind polymers to form a fibrous structure. Polytetrafluoroethylene having fibril forming ability is classified as type 3 according to the ASTM standard and prevents dripping during combustion. Examples of polytetrafluoroethylene having fibril-forming ability are commercially available from Mitsui DuPont Fluorochemicals as Teflon (R) 6J or Teflon (R) 30J, or from Daikin Chemical Industries as polyflon.

The blending amount of the fluorinated polyolefin is preferably in the range of 0.01 to 5 parts by weight with respect to 100 parts by weight of the polycarbonate resin of the substrate. If the blended amount of the fluorinated polyolefin is less than 0.01 parts by weight, the dripping prevention effect tends to be low and the flame retardancy tends to be insufficient, and if it exceeds 5 parts by weight, the extrudability and moldability tend to be impaired. is there. A preferable blending amount of the fluorinated polyolefin is 0.02 to 3 parts by weight, and more preferably 0.05 to 2 parts by weight.

In the case where particularly excellent heat stability is required, the resin composition according to the present invention preferably contains (g) a phosphorus-based heat stabilizer. Conventionally known phosphorus-based heat stabilizers can be used without limitation. For example, a phosphite stabilizer sold under the trade name PEP-36, 2112 by Asahi Denka Co., a phosphate stabilizer sold under the trade name AX-71, or phosphate These stabilizers may be mentioned.

As for the compounding quantity of a phosphorus type heat stabilizer, 0.01-2 weight part is preferable with respect to 100 weight part of (a) aromatic polycarbonate resin. If the phosphorus heat stabilizer is less than 0.01 parts by weight, the effect of improving the heat resistance stability is not sufficient, and if it exceeds 2 parts by weight, the generation of gas becomes remarkable, which is not preferable. In the above blending amount, 0.02 to 1.5 parts by weight is preferable, and 0.02 to 1 part by weight is particularly preferable. With such a small amount of blending, there is no fear of a decrease in mechanical strength due to the phosphorus compound used as a flame retardant.

The resin composition according to the present invention preferably further contains (h) a fluorescent brightening agent and / or (i) an ultraviolet absorber. The fluorescent brightening agent is a pigment or dye that functions to make the yellowness of the molded product obtained from the resin composition according to the present invention inconspicuous and increase the brightness, and the molded product can be viewed brightly. The function is similar to the blue colorant in that it makes the yellowness of the molded product less noticeable, but the blue colorant simply makes the yellow light of the molded product less noticeable, whereas the fluorescent whitening agent It is different in that it absorbs and radiates its energy into blue-violet light in the visible part.

Examples of the (b) fluorescent brightener include coumarin compounds, naphthotriazolyl stilbene compounds, benzoxazole compounds, and diaminostilbene-disulfonate compounds. Specific examples include commercially available products such as “Hackol PSR” manufactured by Hackol Chemical Co., “Hostalux KCB” manufactured by Hoechst AG, and “Whitefloor PSNCONC” manufactured by Sumitomo Chemical.

The compounding amount of the optical brightener is preferably in the range of 0.005 to 0.1 parts by weight with respect to 100 parts by weight of the polycarbonate resin of the substrate. If the blending amount of the fluorescent brightening agent is less than 0.005 parts by weight, the function of making the yellowness of the molded product inconspicuous and increasing the brightness is not sufficiently exerted. Since the toning property in the case of using a coloring agent is inferior, neither is preferable. A preferable blending amount within the above range is 0.01 to 0.05 parts by weight.

The (i) ultraviolet absorber improves deterioration of a molded product due to the action of ultraviolet rays. Specifically, the molded product becomes yellowish when exposed to sunlight or fluorescent light for a long time, but by adding an ultraviolet absorber, the time when the molded product becomes yellowish is greatly increased. Can be delayed. Examples of the ultraviolet absorber include benzophenone, benzotriazole, phenyl salicylate, and hindered amine. Specific examples of the benzophenone ultraviolet absorber include, for example, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, 2-hydroxy-4-dodecyloxy Benzophenone, 2-hydroxy-4-octadecyloxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2 ', 4,4'- Examples thereof include tetrahydroxybenzophenone.

Specific examples of the benzotriazole ultraviolet absorber include, for example, 2- (2′-hydroxy-5-methylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′, 5′-ditertiarybutylphenyl) benzo And triazole and 2- (2′-hydroxy-3′-tertiarybutyl-5′-methylphenyl) benzotriazole. Specific examples of the phenyl salicylate UV absorber include phenylsulcylate, 2,4-ditertiarybutylphenyl-3,5-ditertiarybutyl-4-hydroxybenzoate, and the like. Specific examples of the hindered amine ultraviolet absorber include bis (2,2,6,6-tetramethylpiperidin-4-yl) sebacate.

In addition to the above four types of compounds, the ultraviolet absorber includes a compound having a function of converting the energy held by ultraviolet rays into vibrational energy in the molecule and releasing the vibrational energy as thermal energy. Furthermore, by using together with antioxidant or a coloring agent, the compound which exhibits a synergistic effect, the light stabilizer which acts like a light energy conversion agent called a quencher, etc. can also be used together.

The blending amount of the ultraviolet absorber is preferably selected in the range of 0.01 to 2 parts by weight with respect to 100 parts by weight of the polycarbonate resin of the substrate. When the blending amount of the ultraviolet absorber is less than 0.01 parts by weight, the light resistance of the molded product obtained from the resin composition according to the present invention is insufficient. Since it becomes strong, not only the toning property is inferior, but also it becomes easy to bleed out on the surface of the molded product, which is not preferable. A preferable blending amount of the ultraviolet absorber is 0.05 to 1.8 parts by weight, particularly preferably 0.1 to 1.5 parts by weight.

In order for the polycarbonate resin composition according to the present invention to exhibit desired physical properties, the above four kinds of essential components are blended with the above (e) to (i) as necessary, and the performance of the resin composition is remarkably improved. Other additional components can be blended as long as they are not impaired. Examples of other additional components include stabilizers such as antioxidants, pigments, dyes, lubricants, other flame retardants, mold release agents, additives such as slidability improvers, elastomers, and the like.

In the resin composition according to the present invention, a thermoplastic resin other than the aromatic polycarbonate resin can be blended. The type of the other thermoplastic resin can be appropriately selected according to the purpose of improving the performance such as moldability and chemical resistance. Examples of other thermoplastic resins include polyester resins, polyamide resins, polyolefin resins, polyphenylene ether resins, styrene resins, polysulfones, polyether sulfones, polyphenylene sulfides, polyacrylates, polyamide imides, polyether imides, and the like.

Examples of the polyester resin include polybutylene terephthalate, polyethylene terephthalate, polybutylene naphthalate, and polyethylene naphthalate. Examples of the polyolefin resin include polyethylene and polypropylene. Examples of the polyphenylene ether resins include polyphenylene ether resins and mixed resins of polyphenylene ether and polystyrene and / or HIPS (high impact polystyrene). Examples of the styrene resin include polystyrene, HIPS, AS resin, and ABS resin. Preferable thermoplastic resins other than the aromatic polycarbonate resin include polybutylene terephthalate, polyethylene terephthalate, polyphenylene ether resin, HIPS, and ABS resin. The blending amount of the thermoplastic resin other than the aromatic polycarbonate resin is preferably less than 50% by weight of the total amount of the thermoplastic resin other than the aromatic polycarbonate resin and the aromatic polycarbonate resin, more preferably 40% by weight or less. Preferred is 30% by weight or less.

The method for preparing the resin composition according to the present invention is not particularly limited. For example, (1) a method in which all components are weighed in advance, mixed at the same time, and simultaneously melted and kneaded, and (2) a component excluding glass filler A method of post-adding a glass filler to a material that has been previously weighed and mixed, melted and kneaded, and the like can be mentioned. The resin composition according to the present invention can be molded into various molded products by various molding methods such as an injection molding method and an extrusion molding method that are applied to molding of a thermoplastic resin. In particular, since the resin composition according to the present invention contains (d) a metal salt of perfluoroalkanedisulfonimide as a flame retardant, the flame retardant resin composition containing a conventional bromo flame retardant, or Compared with a flame retardant resin composition containing a phosphate ester flame retardant, the thermal stability during molding is greatly improved.

EXAMPLES Hereinafter, although this invention is demonstrated further more concretely based on an Example, this invention is not limited by the following description examples, unless the summary is exceeded. In addition, the raw material used in the Example and the comparative example is the thing of the following characteristics, and the evaluation test of the resin composition was done by the method as described below.

<Characteristics of Raw Material> (1) PC: Poly-4,4-isopropylidenediphenyl carbonate having a viscosity average molecular weight of 21,500 (manufactured by Mitsubishi Engineering Plastics, trade name: Iupilon S-3000). (2) CS: a glass fiber chopped strand having a diameter of 13 μm and a length of 3 mm (manufactured by Nippon Electric Glass Co., Ltd., trade name: T-571). (3) GF: glass flake having an average particle diameter of 1 mm (manufactured by Nippon Sheet Glass Co., Ltd., trade name: REFG101).

(4) Titanium oxide: processed by the following method and having a particle size of 0.15 to 0.35 μm. -Titanium oxide 1: 3% by weight of methyl hydrogen polysiloxane (organic treatment agent) is blended with titanium oxide not treated with inorganic substances (CR-EL, manufactured by Ishihara Sangyo Co., Ltd.) and stirred by a super mixer. However, it is a titanium oxide obtained by raising the temperature to 120 ° C. and holding it at this temperature for 1 hour and then lowering the temperature to room temperature. Titanium oxide 2: treated with alumina and silica as an inorganic compound and treated with 0.8% by weight of titanium oxide (PF-671, manufactured by Ishihara Sangyo Co., Ltd.) with 3% by weight of methyl hydrogen polysiloxane It is a titanium oxide obtained by blending, raising the temperature to 120 ° C. while stirring with a super mixer and holding at this temperature for 1 hour, and then lowering the temperature to room temperature.

-Titanium oxide 3: Treated with alumina and zirconia as an inorganic compound, and 3% by weight of methyl hydrogen polysiloxane is blended with 1% by weight of titanium oxide (Ishihara Sangyo Co., Ltd., PF-739). The titanium oxide was obtained by raising the temperature to 120 ° C. while stirring with a super mixer and holding at this temperature for 1 hour, and then cooling to room temperature. -Titanium oxide 4: Treated with alumina as an inorganic compound and blended with 3% by weight of methyl hydrogen polysiloxane with respect to 2% by weight of titanium oxide (CR-60, manufactured by Ishihara Sangyo Co., Ltd.) It is titanium oxide obtained by raising the temperature to 120 ° C. while stirring with a mixer and holding at this temperature for 1 hour, and then lowering the temperature to room temperature.・ Titanium oxide 5: Treated with alumina and silica as an inorganic compound, and 3% by weight of methyl oxide polysiloxane (3% by weight, manufactured by Ishihara Sangyo Co., Ltd., PF-726) The titanium oxide was obtained by raising the temperature to 120 ° C. while stirring with a super mixer and holding at this temperature for 1 hour, and then cooling to room temperature.

(5) FR-1: bis (perfluoropropanedisulfonimide potassium salt (trade name: EF-N442, manufactured by Mitsubishi Materials Corporation) (6) FR-2: cyclic 1,3-perfluoropropanedisulfonimide Potassium salt (trade name: EF-N302, manufactured by Mitsubishi Materials Corporation).

(7) PC oligomer: Polycarbonate oligomer having a viscosity average molecular weight of 5,000 (manufactured by Mitsubishi Engineering Plastics, trade name: Iupilon AL071).
(8) PTFE: polytetrafluoroethylene (manufactured by Daikin, trade name: Polyflon F-201L).
(9) Phosphorus stabilizer 1: Tris (2,4-di-t-butylphenyl) phosphite (Asahi Denka Co., Ltd., trade name: 2112). (10) Phosphorus stabilizer 2: a compound having the structure of the following formula (IV), wherein the average value of n is 7 (Asahi Denka Co., Ltd., trade name: AX-71).

(11) Ultraviolet absorber: 2- (2′-hydroxy-5′-t-octylphenyl) benzotriazole (manufactured by Cypro Kasei Co., Ltd., trade name: Seasorb 709). (12) Fluorescent whitening agent: 3-phenyl-7- (2H-naphtho (1,2-d) -triazol-2-yl) coumarin (manufactured by Hakko Chemical Co., Ltd., trade name: Hackol PSR).

<Evaluation Test Method> (1) Flexural modulus (MPa): A three-point bending test was performed according to a bending test method according to ISO 178. (2) Deflection temperature under load (° C.): The heat distortion temperature at 1.80 MPa was measured according to ISO 75.
(3) Flame retardance: A test piece having a thickness of 1.5 mm was molded by an injection molding machine (manufactured by Nippon Steel Works, model: J50-EP), and the test piece was measured based on a UL-94 vertical combustion test. .
(4) Light reflectance (%): A spectrophotometer (manufactured by Shimadzu Corporation, model number) per square test piece having a thickness of 2 mm and a size of 50 mm × 100 mm molded by an injection molding machine (the same as above). The light reflectance at a wavelength of 700 nm was measured by UV 3100).
(5) Total light transmittance (%): A turbidimeter (Nippon Denka Kogyo Co., Ltd.) per square plate test piece having a thickness of 1 mm and a size of 50 mm × 100 mm molded by an injection molding machine (same as above) Manufactured, model: NDH2000), the total light transmittance was measured using D65 as the light source.

(6) Appearance: Using an injection molding machine (same as above), a 3 mm thick square plate test piece was molded under the conditions of a cylinder temperature of 300 ° C., a molding cycle of 55 seconds (normal), and 300 seconds (residence). The appearance of these molded products is visually observed, and “◎” indicates that there is no silver streak, etc., “S” indicates that silver streak is good, “×” indicates that the appearance is poor, and slight generation of silver streak occurs. What was done was displayed with "○".
(7) Stability thermal stability: molecular weight per resin taken from a test piece molded from a molded product having a cycle of 55 seconds (ordinary) and a molded product having a cycle of 300 seconds (residence) molded in the appearance test of (6) above. The value obtained by subtracting the latter from the former was displayed as a molecular weight reduction value. It can be said that the smaller this value is, the better the staying heat stability is.

[Example 1 to Example 9, Comparative Example 1 to Comparative Example 5] Raw materials were weighed at the ratios listed in Table-1, Table-2 (Example) and Table-3 (Comparative Example), and mixed by a blender. Then, the obtained mixture was supplied to a hopper of a 40 mm single screw extruder (manufactured by Tanabe Plastic Machinery Co., Ltd., model: VS-40), and kneaded and pelletized at a barrel temperature of 300 ° C. The obtained pellets were dried in a hot air dryer adjusted to 120 ° C. for 5 hours, and then various test pieces were molded and evaluated by an injection molding machine (same as above) under the condition of a cylinder temperature of 300 ° C. About the obtained test piece, the evaluation test was done by the said evaluation test method, and the result was described in Table-1, Table-2 (Example), and Table-3 (comparative example).

From Table-1 to Table-3, the following becomes clear. 1. The resin composition comprising the four components (a) to (d) essential in claim 1 is excellent in flame retardancy, moldability, etc., mechanical strength such as rigidity, It excels in light-shielding properties, light reflection characteristics, surface appearance, and the like (see Examples 1 to 12). 2. The resin compositions of Comparative Example 1 and Comparative Example 4 in which the titanium oxide (a) essential in claim 1 is not blended have low light reflectance and inferior light shielding properties. 3. Moreover, even if it contains the said (d) flame retardant, the resin composition of the comparative example 2 exceeding the range made essential in Claim 1 is inferior to a moldability. 4). Furthermore, if the blending amount of (b) is less than the range essential in claim 1, the resin composition is inferior in flexural modulus (see Comparative Example 3).

The polycarbonate resin composition according to the present invention can be used as a raw material for producing a molded product such as a lighting device, a liquid crystal display backlight reflector, a light reflector such as an optical switch reflector, or a frame material thereof. This resin composition can be used as a raw material for producing molded articles. A molded product excellent in thinning and weight reduction and excellent in mechanical strength, surface appearance, light shielding property, dimensional stability, light reflection property, and the like can be obtained.

Claims (11)

(a) 100 parts by weight of aromatic polycarbonate resin, (b) 1 to 150 parts by weight of glass filler, (c) 3 to 50 parts by weight of titanium oxide, and (d) the following general formula (I) or general formula ( II) A polycarbonate resin comprising 0.01 to 5 parts by weight of at least one flame retardant selected from alkali metal salts or alkaline earth metal salts of perfluoroalkanedisulfonimide compounds represented by II) Composition.

(A) The polycarbonate resin composition of Claim 1 whose viscosity average molecular weights of aromatic polycarbonate resin are 15,000-30,000. (B) The polycarbonate resin composition according to claim 1 or 2, wherein the glass filler is at least one selected from the group consisting of glass fibers, glass beads, and glass flakes. The polycarbonate resin composition according to any one of claims 1 to 3, wherein (c) the titanium oxide is a titanium oxide having a surface treatment amount of 4 wt% or less based on the titanium oxide. (C) The polycarbonate resin composition according to any one of claims 1 to 4, wherein the titanium oxide is a titanium oxide surface-treated with a siloxane compound. (D) The polycarbonate resin composition according to any one of claims 1 to 5, wherein the perfluoroalkanedisulfonimide compound is a perfluoroalkanedisulfonimide compound having a cyclic structure. The polycarbonate resin composition according to any one of claims 1 to 6, further comprising (e) 1 to 50 parts by weight of an aromatic polycarbonate oligomer with respect to 100 parts by weight of the aromatic polycarbonate resin. object. (E) The polycarbonate resin composition of Claim 7 whose viscosity average molecular weights of an aromatic polycarbonate oligomer are 1,000-10,000. The polycarbonate resin according to any one of claims 1 to 8, wherein (f) 0.01 to 5 parts by weight of a fluorinated polyolefin is further blended with 100 parts by weight of the aromatic polycarbonate resin. Composition. 10. The composition according to claim 1, wherein (a) 0.01 to 2 parts by weight of a phosphorous heat stabilizer is further blended with 100 parts by weight of the aromatic polycarbonate resin. Polycarbonate resin composition. A molded article excellent in light reflectivity obtained by molding the polycarbonate resin composition according to any one of claims 1 to 10.