JP2005255943A - Projection tv cabinet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection TV cabinet that is excellent in shape stability, moisture durability and practical anti-impact properties and has a good surface finishing result after coating and flame retardance. <P>SOLUTION: A large screen thin TV cabinet is obtained by a resin composition composed of polyphenylene ether, a styrene-based resin and a flame retardant. <P>COPYRIGHT: (C)2005,JPO&amp;NCIPI

Description

  The present invention relates to a resin composition excellent in impact resistance, surface appearance, heat resistance, flame retardancy, and dimensional stability suitable for a projection TV material, and a projection TV casing comprising the same.

  The TV included a cathode ray tube in its constituent parts, but in the 1980s, a light projection type projection TV (hereinafter sometimes referred to as PJTV) was developed. In PJTV, a device called a projection tube, in which three primary color light sources are passed through a projection lens and reflected once to a mirror surface, is projected onto a prism type projection plate (Fresnel lens) in a single housing. The projection tube and the electrical circuit that controls the projection tube generate a large amount of heat. When trying to increase the image quality and brightness of the image, the amount of heat generated tends to further increase in order to increase the output of the light source, and the heat generation amount is expected to increase further in the next generation laser light projection type PJTV. The heat generated from the projection tube and the electric circuit accumulates inside the PJ casing, and causes malfunction of the electronic circuit and thermal deformation of the casing. A device for exhausting the heat inside the housing can be found, for example, in the installation of a forced exhaust fan or a device in the housing structure (see, for example, Patent Documents 1 and 2).

  However, if the image quality is improved, the amount of heat generated from the projection tube increases, so that it was expected that the above disclosed technique alone cannot solve the problem. Furthermore, since there is a heat source inside the PJTV casing, a casing made of a flame retardant material is desired. However, in consideration of environmental safety, a halogen-free material has been used in recent years. There is no disclosure of TV housing materials, but this technical disclosure describes specific descriptions of TV types (for example, CRT TVs, projection TVs, liquid crystal TVs, or plasma TVs) and descriptions of the performance required for each. No (for example, see Patent Document 3).

  As a flame retardant material containing no halogen, a composition of PC / ABS (polycarbonate / ABS resin composition) and a phosphorus compound or a compound containing silicon has already been proposed, which is useful for a molded body of an office machine housing. There are disclosures (see, for example, Patent Documents 4 and 5). Although the resin composition has been used as a television material, it often causes short shots of PJTV casing fine holes and poor surface appearance. This is because the molding fluidity of the PC / ABS resin composition is low. Therefore, in order to obtain a good large-screen thin TV with this resin composition, it is necessary to correct the mold, redesign the gate position by a flow analysis method, and optimize the molding conditions at the manufacturing site. Such injection moldability deteriorates the appearance of the resulting casing. If the molding fluidity is poor, the orientation remaining in the housing is increased, the orientation of the large molded body is relaxed, and the deformation gradually occurs. Furthermore, the PC / ABS resin composition has a relatively large linear expansion coefficient, and there is a concern that the focal point of the image is shifted due to deformation due to heat.

JP 2000-147449 A JP 2002-199307 A JP-A-8-12831 JP-A-9-194713 Japanese Patent Application No. 2000-91746

  An object of the present invention is to provide a PJTV housing that is heat resistant, has no defocus due to thermal deformation, is flame retardant, and has a good surface appearance.

The inventors have solved various problems that occur in the thin TV casing and have completed a casing that retains flame retardancy.
The casing of the present invention is
1. A projection TV case obtained from a resin composition (A) comprising polyphenylene ether, a styrene resin and a flame retardant,
2. Resin composition (A) in which the flame retardant is a phosphoric ester compound, and the molar product of oxygen atoms derived from the resin component contained in 1 kg of the resin composition (A) and phosphorus atoms derived from the flame retardant is 1.1 or more. The projection TV housing according to 1 above, obtained from

3. (A) The projection TV casing according to the above 1 or 2, obtained from the resin composition (A) comprising 90 to 99.9% by weight of the component and 0.1 to 10% by weight of the rubbery polymer (B),
4). Component (B) is an aromatic vinyl conjugated diene block copolymer (B-1) and / or ethylene and carbon in which 20% or more of the conjugated diene part is hydrogenated and the molecular weight is 30,000 to 200,000. 4. The projection TV casing according to 3 above, which is obtained from the resin composition (A), which is an olefin elastomer (B-2) composed of 1-alkene having a number of 4 or more,
5). (B-1) The projection TV casing according to 4 above, wherein the aromatic vinyl content of the component is 50 to 80% by weight,

6). (B-2) The projection TV casing according to 4 above, obtained from the resin composition (A) having a component density of 0.85 to 0.95 g / cc,
7). Furthermore, the projection TV casing according to any one of the above 1 to 6, obtained from a resin composition (A) comprising 0.1 to 5% by weight of a copolymer composed of ethylene-propylene,
8). The projection TV casing according to any one of the above 1 to 7, wherein the surface of the casing is coated.
9. The projection TV casing according to any one of 1 to 8, wherein the screen size is 40 inches or more,
It is.

  The projection TV casing of the present invention is excellent in heat resistance, shape stability, deterioration resistance, impact resistance, paintability and flame retardancy.

Details of the present invention will be described below.
The PJTV housing includes a lower projection unit and an upper image projection unit. The upper part and the lower part may be partitioned by a partition plate or may not be partitioned. A combination of housing materials that can suppress the heat deformation due to heat generated from the projection tube and the electric circuit, can impart flame retardancy, and can solve the above-described problems, is polyphenylene ether (hereinafter sometimes abbreviated as PPE), It is a combination of a styrene resin and a flame retardant.
In the present invention, PPE used as the component (a) is represented by the following general formulas (1-a) and (1-b) (wherein R1, R2, R3, R4, R5, R6 are alkyl groups having 1 to 4 carbon atoms) , Aryl groups, halogens, hydrogen and the like, and R5 and R6 are not hydrogen at the same time.) Homopolymers and / or copolymers having a repeating unit represented by:

  Representative examples of PPE homopolymers include poly (2,6-dimethyl-1,4-phenylene) ether, poly (2-methyl-6-ethyl-1,4-phenylene) ether, poly (2,6 -Diethyl-1,4-phenylene) ether, poly (2-ethyl-6-n-propyl-1,4-phenylene) ether, poly (2,6-di-n-propyl-1,4-phenylene) ether Poly (2-methyl-6-n-butyl-1,4-phenylene) ether, poly (2-ethyl-6-isopropyl-1,4-phenylene) ether, poly (2-methyl-6-chloroethyl-1) , 4-phenylene) ether, poly (2-methyl-6-hydroxyethyl-1,4-phenylene) ether, poly (2-methyl-6-chloroethyl-1,4-phenylene) ether, etc. Moporima and the like.

PPE is a copolymer of 2,6-dimethylphenol and 2,3,6-trimethylphenol or a copolymer of o-cresol or a copolymer of 2,3,6-trimethylphenol and o-cresol. A polyphenylene ether copolymer mainly comprising a polyphenylene ether structure.
Particularly preferred is poly (2,6-dimethyl-1,4-phenylene) ether, and the reduced viscosity (0.5 g / dl, chloroform solution, measured at 30 ° C.) is in the range of 0.2 to 0.6. , Preferably in the range of 0.30 to 0.55, more preferably in the range of 0.30 to 0.45. In addition to the above-mentioned PPE, the PPE used in the present invention is an unsaturated carboxylic acid or derivative thereof (for example, maleic acid, fumaric acid, itaconic acid, halogenated maleic acid, etc., acid anhydrides thereof, Esters, amides, imides, etc., and acrylic acid and methacrylic acid, particularly maleic anhydride is preferred), styrene or its derivatives in the presence or absence of a radical generator, in a molten state, in a solution state, in a slurry It may be a known modified PPE obtained by reacting at a temperature of 80 to 350 ° C. in the state, or may be a mixture of the above-mentioned PPE and the modified PPE in an arbitrary ratio.

  The styrene resin used in the present invention is a high impact polystyrene (hereinafter also referred to as HIPS) obtained by graft polymerization of aromatic vinyl such as styrene or α-methylstyrene on a conjugated diene rubber, or general purpose polystyrene obtained by polymerizing only an aromatic vinyl compound. (Hereinafter also referred to as GPPS), ABS resin obtained by graft polymerization of aromatic vinyl and acrylonitrile on conjugated diene rubber, SAN resin obtained by copolymerizing aromatic vinyl compound and acrylonitrile, copolymer of aromatic vinyl and oxazoline, aromatic Copolymer of aromatic vinyl and acrylic acid, copolymer of aromatic vinyl and (meth) acrylic acid, copolymer of aromatic vinyl and alkyl methacrylate (alkyl having 1 to 4 carbon atoms), aromatic vinyl and Unsaturated carboxylic acid or acid anhydride (eg maleic anhydride) Copolymer, there are any combination of such, it is any combination of HIPS and GPPS is particularly preferred. The average particle diameter of the gel rubber of HIPS is 0.2 μm or more from the viewpoint of imparting impact, and 5 μm or less, preferably 0.5 to 3 μm, more preferably 0.7 to 2 μm from the viewpoint of the surface appearance of the molded product. . The polymer structure of polybutadiene constituting the gel rubber is preferably one in which 1,2, and / or 3,4 bonds are 5% or less. The term “rubber particle system” as used herein refers to an average particle diameter measured by a Coulter counter method measured at 23 ° C. in a DMF (dimethylformamide) solvent.

  The flame retardant may be any combination of a halogen-free phosphorus compound and a silicon-containing compound in consideration of environmental properties, and a phosphorus compound is preferable. Examples of the phosphorus compound include red phosphorus, black phosphorus, triaryl phosphate, and phosphate ester compounds represented by (2-a) or (2-b).

  Here, Q1, Q2, Q3, and Q4 represented by (2-a) and (2-b) independently represent an alkyl group having 0 to 6 carbon atoms. R1 and R2 represent hydrogen or a methyl group. R3 and R4 independently represent hydrogen or a methyl group. From the viewpoints of thermal stability and hydrolysis resistance, the phosphoric acid ester represented by the formula (2-a) is more preferable.

  In general formula (2-a), n1 and n2 are preferably 0, and R3 and R4 are preferably methyl groups. In general formula (2-a), m1, m2, m3, and m4 are 0 or 1, that is, there is no substitution of an alkyl group on the terminal phenyl group, or Q1, Q2, Q3, and Q4 are methyl. It is a group. The phosphate ester compound represented by (2-a) has a binding structure with a specific bifunctional phenol and a terminal structure with a specific monofunctional phenol. As the bifunctional phenol, 2,2-bis (4-hydroxyphenyl) propane [commonly known as bisphenol A], 2,2-bis (4-hydroxy-3-methylphenyl) propane, bis (4-hydroxyphenyl) methane, Examples thereof include, but are not limited to, bisphenols such as bis (4-hydroxy-3,5-dimethylphenyl) methane and 1,1-bis (4-hydroxyphenyl) ethane.

  Bisphenol A is particularly preferable. As the monofunctional phenol, unsubstituted phenol, monoalkylphenol, dialkylphenol, or trialkylphenol can be used alone or as a mixture of two or more. In particular, phenol, cresol, dimethylphenol (mixed xylenol), 2,6-dimethylphenol, and trimethylphenol are preferable. The phosphate ester compound represented by (2-a) is also excellent in thermal stability and hydrolysis resistance. In addition, it does not cause problems such as gelation due to reaction with polyphenylene ether resin, does not accelerate the decomposition of polyphenylene ether resin, and corrodes internal metal parts and molds of molding machines. I will not let you. In order to further improve the impact properties of the housing, the rubbery polymer may be kneaded into the resin composition (A) of the present invention.

  The component (B-1) of the rubber-like polymer of the present invention contains an aromatic vinyl-conjugated diene block copolymer such as a polystyrene-polybutadiene block copolymer and a polystyrene-polyisoprene block copolymer, natural rubber (polyisoprene). ), Uncrosslinked butadiene and the like, and aromatic vinyl-conjugated diene block copolymers are preferable. The aromatic vinyl-conjugated diene compound preferably has a conjugated diene portion hydrogenated from the viewpoint of good thermal stability. This hydrogenated product (hereinafter sometimes abbreviated as HTR) is composed of a polymer block A mainly composed of at least one vinyl aromatic compound and a polymer block B mainly composed of at least one conjugated diene compound. A hydrogenated block copolymer obtained by hydrogenating a block copolymer comprising, for example, AB, ABA ', BAB'-A', ABA ' A hydrogenated product of a vinyl aromatic compound-conjugated diene compound block copolymer having a structure such as -B ', A-B-A'-B', and A-B-A'-B'-A ". A and A ′ A ″ representing the aromatic vinyl moiety may have the same molecular structure or different molecular structures, and B and B ′ representing the hydrogenated conjugated diene moiety may be the same or different molecular structures. .

  In addition, the polymer block A mainly composed of these vinyl aromatic compounds and the polymer block B mainly composed of conjugated diene compounds are the distribution of the conjugated diene compound or vinyl aromatic compound in the molecular chain in each polymer block. May be random, tapered (in which the monomer component increases or decreases along the molecular chain), partially in a block form, or any combination thereof.

  As the vinyl aromatic compound constituting the block copolymer, for example, one or more kinds can be selected from styrene, α-methylstyrene, vinyltoluene, p-tert-butylstyrene, diphenylethylene, and the like. Of these, styrene is preferred. Further, as the conjugated diene compound, for example, one or more kinds are selected from butadiene, isoprene, 1,3-pentadiene, 2,3-dimethyl-1,3-butadiene, etc., among which butadiene, isoprene and These combinations are preferred. The polymer block mainly composed of the conjugated diene compound can arbitrarily select the microstructure in the block. For example, in the polymer block mainly composed of butadiene, 1, 2 of the bonded structure before hydrogenation is obtained. -The vinyl bond is 2 to 60%, preferably 8 to 40%. Furthermore, the hydrogenation rate of the conjugated diene part is preferably 20% or more, more preferably 80% or more.

  In addition, calculation of a hydrogenation rate is calculated | required from the integrated value of the chemical shift peak derived from a methylene group and a methyl group calculated from hydrogen FT-NMR measured by using a heavy chloroform solvent as a solvent. The content of the aromatic vinyl in the HTR is not particularly limited, but is preferably 50 to 80% by weight, more preferably 55 to 75% by weight. The average molecular weight of HTR is 30,000 to 200,000, preferably 50,000 to 150,000, and more preferably 65,000 to 120,000. The molecular weight here means the weight average molecular weight in terms of styrene. The structure of HTR includes four types such as A-B-A 'type 3 and A-B-A'-B ", but type 4 is preferred.

  The (B-2) component of the rubbery polymer of the present invention is composed of low density polyethylene (LDPE), linear polyethylene (LL-PE) high density polyethylene (HDPE), polypropylene (PP), ethylene-1-butene copolymer. A copolymer, ethylene-1-alkene such as ethylene-1-octene copolymer, ethylene-methyl methacrylate copolymer, ethylene ethyl methacrylate copolymer, maleic anhydride-modified polyethylene, vinyl acetate (PVA), polyvinyl alcohol, There are any one selected from the group such as, or a combination of two or more. Preferably, polyethylene and a copolymer having 4 or more carbon atoms, that is, an ethylene-1-butene copolymer, ethylene-1- Any one of octene copolymers, or a combination of both, more preferably ethylene-1-octyl A down copolymer ranges its density is the density 0.85~0.95g / CC. This corresponds to a polymerization molar ratio of (ethylene) / (1-alkene) = (95-80) / (5-20), and MFR was measured at JIS K7210 190 ° C. under a load of 2.16 kg, 0.3 The range is 10 to 10 g / 10 min, preferably 0.8 to 8 g / 10 min.

The components (B-1) and (B-2) of the rubber-like polymer of the present invention can be used alone or in combination.
The combination of (B-1) and (B-2) is preferable in order to improve the practical impact characteristics (particularly the toughness of the thickness part of 3 mm or less) of the housing of the present invention and to improve the finish after coating. . The combination of the two components increases the practical strength of the thin TV casing and improves the finish of the casing surface. In addition, when applied, the surface adhesion strength of the coating is improved and the finish is beautiful.
Moreover, this (B-1) / (B-2) addition amount ratio is (10-0 weight%) / (0-10 weight%), Preferably (0.3-5 weight%) / (0.3 -5 wt%), more preferably (0.5-3 wt%) / (0.5-3 wt%).

  In order to make the surface appearance of a thin TV beautiful, it is preferable that the casing is easily released from the mold during injection molding. For this purpose, 0.1 to 5% by weight, preferably 0.3 to 2% by weight, more preferably 0.3 to 0.7% by weight of ethylene-propylene copolymer (EP) is added. This ethylene-propylene copolymer has a density of 0.85 to 0.90 g / cc, a melt flow rate (MFR) of JIS K7210, measured at 230 ° C. and a load of 2.16 kg, 0.5 to 0.9 g / 10 min. Is suitable.

A heat stabilizer, a color pigment, and a fluidity modifier (for example, liquid paraffin having a number average molecular weight of 150 to 500, JP-A-8-12831, based on 100 parts by weight of the resin composition obtained as described above. Lower hydrocarbon petroleum resins, oils and fats such as stearic acid and palmitic acid, and zinc or alkaline earth metal salts thereof), light-proofing agents are 0.1 to 2 parts by weight of hydroxybenzotriazoles, hindered amines 0.1 to 2 parts by weight of both, or any one selected, heat stabilizer such as pentaerythritol type phosphoric acid compound, bis (2,6-di-t-butyl-4-methylphenyl) pentaerythritol -Add 0.01 to 2 parts by weight of diphosphite and / or tetrafluoroethylene, graphite, Ethylene (molecular weight of 500,000 or more) may be a thin TV housing of adding 0.01 parts by weight.
The above-mentioned effects can be more exhibited when the screen size of the housing is 40 inches or more, preferably 50 inches or more, and more preferably 70 inches or more.

The present invention will be further described below with reference to examples, but the present invention is not limited to these examples. Hereinafter, resin materials used in Examples and Comparative Examples and evaluation methods will be described.
(1) Adjustment of PPE PPE used in Examples and Comparative Examples is adjusted by the following method. A reactor having an oxygen blowing port in the lower part was thoroughly purged with nitrogen, and then 2 2 in a mixed solvent of copper (II) bromide 53.6 g, di-n-butylamine 1110 g, toluene 20 L, and n-butanol 4 L. , 6-xylenol 16L and methanol 4L are charged. After stirring and thoroughly mixing the reaction solution, oxidative polymerization is carried out for 360 minutes while stirring oxygen. During this time, the reactor was maintained at 30 ° C. After completion of the polymerization, the precipitated resin body was separated by filtration, and the solid content was further washed / rinsed with a methanol / hydrogen chloride mixed solution to remove and adjust unreacted substances, by-products and reaction catalyst residues. The resin body (powder) thus obtained is used. The polymerization degree of the polymer was changed depending on the reaction time, and a reduced viscosity in a chloroform solution of 0.41 was used.

(2) Aromatic vinyl copolymer The HIPS used in Examples and Comparative Examples has an average rubber particle size of 1.5 μm (in Coulter counter method, in DMF solvent), rubber content of 10% by weight, and MFR An ISO R1133 load of 5 kg, a melt flow at 200 ° C. of 10 g / 10 min, a weight average molecular weight of the matrix of 175,000, a gel content of 22.8% by weight, and a rubber content of 10% by weight are used. The rubber particle diameter of HIPS is measured in a DMF (dimethyl sulfoxide) solvent at a temperature of 23 ° C. using a Coulter counter method. In addition, GPPS is used that has a Vicat softening temperature of 107 ° C. with ASTM-D1525 and a melt flow of 7.0 g / 10 min.
(3) Phosphorus compound As the phosphorous compound used in the examples, trade name CR741 (bisphenol A-bisdiphenyl phosphate) manufactured by Daihachi Chemical Co., Ltd. is used. This product has a chemical formula represented by (3).

(4) HTR
The following HTRs are used in the examples and comparative examples.
The styrene-butadiene block copolymer was prepared by the method described in Japanese Patent No. 2797015, and the following elastomers were prepared. The amount of bound styrene is calculated and calculated by NMR method (TMS 0.03% in ¹ H-NMR CDCL ₃ solvent). Here, the molecular weight of the styrene portion in the case of a 4-type elastomer means the sum of the amount ends, that is, A1 + A2 of A1-B1-A2-B2. The HTR used in the examples is a type 4 block copolymer having a bound styrene content of 60% by weight, a molecular weight of 85,000, and a hydrogenation rate of the butadiene component of polybutadiene of 99.6%.

(5) Ethylene-1 alkene copolymer (EO)
The ethylene-1-alkene copolymer used in the examples is as follows.
The product name Engage 8003 manufactured by DuPont-Dow Elastomer Japan Co., Ltd. is used. (MFR: JIS K7210 190 ° C., 2.16 kg load measurement, 0.83 g / 10 min, density: 0.885 g / CC)
(6) Flame retardant HIPS used in Comparative Example 2
As the flame retardant HIPS used in Comparative Example 2, VS55 (ISO-R1133, 200 ° C., 5 kg load measurement, 17 g / 10 min) manufactured by PS Japan Co., Ltd., to which a brominated flame retardant is added is used.

(7) PC / ABS and FR-HIPS
The PC / ABS used in Comparative Example 1 uses a product name CU6800 (MFR: ISO R1133 200 ° C., 5 g load measurement 3.5 g / 10 min HDT: 85 ° C.) manufactured by General Electric Co., Ltd. Since this material is hygroscopic, it is vacuum dried at 80 ° C. for 6 hours before injection molding.
(8) Ethylene-propylene copolymer (EPP)
As the alpha olefin copolymer used in the examples, Tafmer P680-J manufactured by Mitsui Chemicals, Inc. is used. (MFR: JIS K7210 230 ° C., 2.16 kg load measurement, 0.7 g / 10 min, density: 0.87 / 23 ° C.) is used.

(9) Izod Impact Value The Izod impact value shown in Table 1 is measured using a test piece having a thickness of 6.32 mm according to ASTM-D-256.
(10) Dart impact value The Dart impact value shown in Table 1 was measured with an impact test measuring machine, model IFW80 manufactured by Rosand. The Dart 2-1 mm listed in Table 1 is a molded product having a level difference of 2 mm and 1 mm, and when the 2 mm thickness part is fixed (cantilever) and dropped onto the 1 mm position, the thickness is 2 mm and 1 mm. Indicates the breaking energy when the boundary is broken by stress concentration. The sample shape at this time is 30 x 50 mm, the weight of the falling weight of the Dart impact value and the height of the falling weight are 3.2 mm, 0.7 m, and 2 mm-1 mm when the thickness is 2 mm and 1 mm thick. The test time is 3.2 kg, 0.3 m.

(11) Surface appearance A five-sided box-shaped molded product 1 having length × width × thickness = 72 × 135 × 10.2 cm is obtained by injection molding. The molded product 1 has a 51 × 91 cm cutout on a 72 × 135 cm surface. The opposite side of the cut-out surface is empty. The thickness of this product is 1.5 mm on the four side surfaces and 2 mm on the cut surface. The injection molding gate is provided at the center of the edge of the four surfaces on each side and has four locations. The taper of the mold cavity is 2 °. The resin temperature for injection molding is 280 ° C.
The surface of the molded casing thus obtained is visually observed. Appearance was judged by three points: flow mark, silver, and short shot. The visual appearance was judged as ◎ for very good, ◯ for good, x for poor, and xx for very bad.

(12) Deformation of casing The molded product 1 and the box-shaped molded product 2 obtained in (11) above (72 × 135, 40 × 135, thickness 40 cm), and the surface of 72 × 135 cm is vacant) Mold. There is no surface on the joint surface between the molded product 1 and the molded product 2. One hole of φ5 cm is formed on each of two side surfaces of the box-shaped molded product, and the cut surface of 51 × 91 cm is closed with a veneer plate. A hole of φ10 cm is opened at the center of the plywood. Hot air of 75 ° C. is introduced at a rate of 0.5 m / s from the hole in the veneer plate and left for 4 hours to observe the whole state. Those with significant deformation cause deformation as shown in FIG. This degree was observed. A good state is indicated by ○, and a state in which the deformation is large and the fitting part is not suitable is indicated by ×. The hot air test at 75 ° C. corresponds to the temperature near the projection tube of the projection TV.

(13) Coating evaluation The molded casing obtained in the above (11) was manufactured by SGI Creos Co., Ltd., Mr. Color spray Part number J8 (gray color) is applied, and after drying, the surface state is visually observed.
(14) Hygroscopic deterioration test The molded casing obtained in (11) above is left in a constant temperature room at 60 ° C. and 80% humidity for 10 hours, and the casing is dropped from the corner at a height of 1.5 m, The presence or absence of cracks was observed.
(15) Preparation of Resin Composition Examples The resin compositions used were PPE powder, GPPS, HTR, ethylene-1 alkene using a ZSK25 twin screw extruder (L / D: 46) manufactured by Warner & Friedler. A copolymer and an ethylene-propylene copolymer were charged, and HIPS was charged from a hopper at L / D = 15, and then a phosphorus compound was injected from the position of L / D = 35 to adjust.

[Examples 1-5 and Comparative Examples 1-2]
Table 1 shows the composition of the resin composition and the results obtained.

  According to the present invention, a projection TV casing made of a PPE resin composition has good heat resistance, good shape stability, durability due to moisture, good practical impact characteristics, good finish after painting, and difficult. A large-screen thin TV casing that is flammable and environmentally friendly can be provided.

It is the projection TV housing | casing used for the Example and the comparative example. This is a projection TV case that is thermally deformed.

Explanation of symbols

1: Hot air inlet 2: Hot air outlet 3: Projection TV front part 4: Projection TV rear part

Claims (9)

A projection TV casing obtained from a resin composition (A) comprising polyphenylene ether, a styrene resin and a flame retardant. Resin composition (A) in which the flame retardant is a phosphoric ester compound, and the molar product of oxygen atoms derived from the resin component contained in 1 kg of the resin composition (A) and phosphorus atoms derived from the flame retardant is 1.1 or more. The projection TV housing according to claim 1, obtained from the above. The projection TV casing according to claim 1 or 2, which is obtained from the resin composition (A) comprising (A) component 90 to 99.9% by weight and rubbery polymer (B) 0.1 to 10% by weight. Component (B) is an aromatic vinyl conjugated diene block copolymer (B-1) and / or ethylene and carbon in which 20% or more of the conjugated diene part is hydrogenated and the molecular weight is 30,000 to 200,000. The projection TV casing according to claim 3, which is obtained from the resin composition (A), which is an olefin elastomer (B-2) composed of 1-alkene having a number of 4 or more. The projection TV casing according to claim 4, wherein the content of the aromatic vinyl (B-1) is 50 to 80% by weight. (B-2) The projection TV housing | casing of Claim 4 obtained from the resin composition (A) whose density of a component is 0.85-0.95 g / cc. Furthermore, the projection TV housing | casing in any one of Claims 1-6 obtained from the resin composition (A) containing 0.1-5 weight% of copolymers which consist of ethylene-propylene. The projection TV casing according to any one of claims 1 to 8, wherein a surface of the casing is coated. 9. The projection TV housing according to claim 1, wherein the screen size is 40 inches or more.

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