JPH0121187B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a resin composition, and more particularly to a flame-retardant thermoplastic resin composition with excellent thermal stability. Thermoplastic polyesters, represented by polyethylene terephthalate and polybutylene terephthalate, have excellent chemical and mechanical properties and are widely used in fibers, films, plastics, and the like. In recent years, it has come to be used in large quantities, especially when it is molded into parts for electrical equipment, interior and exterior parts of automobiles, and other molded products by injection molding and the like. Furthermore, by adding various additives to these thermoplastic polyesters, such as fibrous reinforcing materials such as glass fibers and carbon fibers, and functional agents such as inorganic fillers, their properties are further improved, and their application areas are expanding. It's being expanded. It is known to add thermoplastic polycarbonate as one such modifier. In other words, it is known that adding thermoplastic polycarbonate to thermoplastic polyester has the effect of improving impact strength and reducing internal distortion of molded products, and is actually used (for example, Publication No. 53-129246, Japanese Unexamined Patent Publication No. 1983-
94556, JP-A-54-91557). On the other hand, since thermoplastic polycarbonate has excellent mechanical strength and electrical insulation properties, the demand for thermoplastic polycarbonate as an injection molding material is increasing year by year, similar to the above-mentioned thermoplastic polyester. However, the range of application of polycarbonate resins is often limited because of poor resistance to organic solvents and poor fluidity during molding due to high melt viscosity. For this reason, many improvements have been attempted, one of which is known as an improvement method by adding thermoplastic polyester. As mentioned above, thermoplastic polyester and thermoplastic polycarbonate are compatible and homogenized when melted, so that blends in various ratios can compensate for each other's shortcomings and emphasize their strengths as a composite material.
It has become widely used in recent years. However, thermoplastic polyester and thermoplastic polycarbonate are inherently flammable resins, and their blends are also flammable, and if ignited, they will gradually burn without extinguishing even if the fire source is removed, so their field of application is limited. This is a fatal drawback from the viewpoint of fire safety, especially in the fields of electrical and communication equipment. It is generally known that flame retardation of combustible resins can be achieved by using an organic halide and antimony trioxide in combination. When the flame retardant combination of these two is applied to thermoplastic polyester, it exhibits a remarkable flame retardant effect and is put into practical use. However, when antimony trioxide is added to a blend of thermoplastic polyester and thermoplastic polycarbonate, the thermal stability of the blend during melt molding is significantly impaired, and not only does it cause silver streaks and foaming in the appearance of the molded product. It was confirmed that the mechanical strength of the molded product was also significantly reduced. It is unclear why this phenomenon occurs when antimony trioxide is added to a blend of thermoplastic polyester and thermoplastic polycarbonate, but in general, antimony trioxide acts as an excellent transesterification catalyst for thermoplastic polyester, When a trace amount of organic acid or water is present, it exhibits a decomposition promoting effect,
Furthermore, considering that it is known that when coexisting with thermoplastic polycarbonate, polycarbonate decomposes when heated and releases carbon dioxide gas, it is possible that some kind of chemical reaction promotion ability of antimony trioxide may cause the above-mentioned unfavorable phenomenon. It is assumed that this will bring about The present inventor focused on the effect of antimony trioxide, and found that if the antimony trioxide's effect as a flame retardant aid is maintained while its chemical reaction promoting ability is reduced, the resin composition will be thermally stabilized during molding. As a result of considering various surface treatments for antimony trioxide, we found that antimony trioxide treated with an alkoxysilane compound satisfies the above objectives. In other words, when antimony trioxide treated with an alkoxysilane compound is blended into a blend of thermoplastic polycarbonate and thermoplastic polyester, the heat resistance during molding of the resin composition is lower than when untreated antimony trioxide is blended. It has been found that a molded product with excellent stability and no silver streaks or foaming can be obtained. Furthermore, we found that when an organic halogen compound is blended, a flame-retardant resin composition with excellent thermal stability and high mechanical strength can be obtained,
We have arrived at the present invention. That is, the present invention comprises: (A) per 100 parts by weight of a mixture consisting of 1 to 99% by weight of thermoplastic polyester and 99 to 1% by weight of thermoplastic polycarbonate, (B) 0 to 200 parts by weight of filler, and (C) organic halogen. Compound as halogen element amount
0.1 to 30 parts by weight, and (D) 0.1 to 20 parts by weight of antimony trioxide treated with an alkoxysilane as an elemental amount of antimony. Component (A) used in the present invention is a blend of thermoplastic polyester (A-1) and thermoplastic polycarbonate (A-2). This thermoplastic polyester (A-1) uses terephthalic acid or its ester-forming derivative as an acid component, and has 2 carbon atoms as a glycol component.
The main targets are linear saturated polyesters obtained using ~10 glycols or their ester-forming derivatives, such as polyethylene terephthalate, polypropylene terephthalate, polytetramethylene terephthalate (polybutylene terephthalate), polyhexamethylene terephthalate,
Examples include polycyclohexane 1,4-dimethylol terephthalate and polyneopentyl terephthalate. Among these, polyethylene terephthalate and polybutylene terephthalate are particularly preferred. These thermoplastic polyesters can be used alone or in combination
It may also be used as a mixture of more than one species. Other polyesters may also be used, such as those in which part of the terephthalic acid component or the glycol component having 2 to 10 carbon atoms is replaced with another copolymer component as the acid component. Such copolymerization components include, for example, isophthalic acid and phthalic acid; halogen-substituted phthalic acids such as tetrabromophthalic acid and tetrabromoterephthalic acid; alkyl-substituted phthalic acids such as methylterephthalic acid and methylisophthalic acid;
- Naphthalene dicarboxylic acids such as naphthalene dicarboxylic acid, 2,7-naphthalene dicarboxylic acid, and 1,5-naphthalene dicarboxylic acid; diphenyl dicarboxylic acids such as 4,4'-diphenyl dicarboxylic acid and 3,4'-diphenyl dicarboxylic acid; Acids; 4,
Aromatic dicarboxylic acids such as 4'-diphenoxyethanedicarboxylic acid; fatty acids or alicyclic dicarboxylic acids such as succinic acid, adipic acid, sebacic acid, azelaic acid, decadicarboxylic acid, cyclohexanedicarboxylic acid; trimethylene glycol,
Aliphatic diols such as tetramethylene glycol, hexamethylene glycol, neopentyl glycol, diethylene glycol, 1,4-cyclohexanedimethanol, etc.; dihydroxybenzenes such as hydroquinone, resorcinol, etc.; 2.
2-bis(4-hydroxyphenyl)propane,
Bisphenols such as bis(4-hydroxyphenyl)sulfonic acid; aromatic diols such as ether diols obtained from bisphenols and glycols such as ethylene glycol; polyoxyethylene glycol, polyoxypropylene glycol, Examples include polyoxyalkylene glycols such as oxytetramethylene glycol; oxycarboxylic acids such as ε-oxycaproic acid, hydroxybenzoic acid, hydroxyethoxybenzoic acid, and the like. One or more of these copolymerization components can be used, and the proportion thereof is 20 mol% or less, especially 10 mol% or less, based on the total dicarboxylic acid (half of the amount of oxycarboxylic acid is calculated as carboxylic acid). It is preferable. Furthermore, these thermoplastic polyesters contain branching components such as tricarballylic acid, trimellisic acid,
An acid capable of forming a trifunctional ester such as trimellitic acid or a tetrafunctional ester such as pyromellitic acid, and/or glycerin, trimethylolpropane,
An alcohol having trifunctional or tetrafunctional ester forming ability such as pentaerythritol may be copolymerized in an amount of 1.0 mol% or less, preferably 0.5 mol% or less, more preferably 0.3 mol% or less. The intrinsic viscosity of the thermoplastic polyester used here, especially polyethylene terephthalate, is preferably 0.35 or more, more preferably 0.45 or more, particularly 0.50 or more, when measured at 35° C. using an orthochlorophenol solvent. The above-mentioned thermoplastic polyester can be produced by a conventional production method, such as a melt polymerization reaction or a method combining this with a solid phase polymerization reaction. In addition, thermoplastic polycarbonate (A-2) has the following general formula [In the formula, R represents phenylene, halo-substituted phenylene, or alkyl-substituted phenylene group, and X and Y each represent hydrogen, a hydrocarbon group, or a hydrocarbon group that forms a cycloalkane group together with adjacent carbon atoms. However, the total number of carbon atoms in X and Y shall be up to 12. ] means a thermoplastic polycarbonate having a unit represented by the following. Preferred thermoplastic polycarbonates are 4,
4'-dioxydiallylalkane polycarbonate, such as bis(4-hydroxyphenyl)methane, bis(4-hydroxyphenyl)ethane, 2,2-(4-hydroxyphenyl)propane, bis(4-hydroxyphenyl) Hydroxy-3,5-dichlorophenyl)methane, 2,2-(4-hydroxy 3,
4, such as 5-dimethylphenyl)propane, bis(4-hydroxyphenyl)phenylmethane, etc.
It is a carbonate obtained by the reaction of 4'-dioxydiphenylalkane with phosgene or diphenyl carbonate. The amount of these thermoplastic polycarbonates (A-2) mixed is 1 to 99% by weight based on the total amount with the thermoplastic polyester. With this amount ratio, substantial effects such as improved mechanical strength and solvent resistance can be obtained by blending the two. Preferably it is 10 to 90% by weight. The organic halogen compound used as component (C) in the present invention has a chlorine atom or a bromine atom in the molecule and acts as a flame retardant for thermoplastic polyester or thermoplastic polycarbonate,
This includes known organic halogen compounds that are commonly used as flame retardants. Such compounds include, for example, hexabromobenzene, hexachlorobenzene, pentabromotoluene, pentachlorotoluene, pentabromophenol, pentachlorophenol, hexabromobiphenyl, decabromobiphenyl, tetrabromobutane, hexabromocyclododecane, perchloro pentacyclodecane, decabromodiphenyl ether, octabromodiphenyl ether,
Low molecular weight organic halogen compounds such as hexabromodiphenyl ether, ethylene bis(tetrabromophthalimide), tetrachlorobiphenol A, tetrabromobisphenol A, halogenated polycarbonates (e.g. brominated bisphenol-A)
Polycarbonate oligomers produced using raw materials), halogenated epoxy compounds (for example, diepoxy compounds produced by the reaction of brominated bisphenol-A and epichlorohydrin, obtained by the reaction of brominated phenols and epichlorohydrin) halogenated polymers such as monoepoxy compounds), polychlorostyrene, brominated polystyrene, poly(dibromophenylene oxide), dechlorane plus (condensation compound of 2 moles of tetrachlorocyclopentadiene and 1 mole of cyclooctadiene), Examples include oligomers or mixtures thereof. The amount of these organic halogen compounds (C) added is 0.1 to 30 parts by weight, preferably 1 to 15 parts by weight as a halogen element, per 100 parts by weight of the mixture (A) of thermoplastic polyester and thermoplastic polycarbonate. If the amount added is less than 0.1 part by weight, the flame retardance will not be sufficient, and if it exceeds 30 parts by weight, the physical properties of the composition will deteriorate, which is not preferable. Antimony trioxide treated with an alkoxysilane compound used as component (D) in the present invention is
It has the effect of acting as a flame retardant auxiliary agent that promotes the flame retardancy of the organic halogen compound of component (C) mentioned above. Antimony trioxide can be obtained, for example, by boiling naturally occurring minerals such as analite and valentinite, or antimony oxychloride, which is a hydrolysis product of antimony chloride, with a sodium carbonate solution. Such antimony trioxide is generally used as a flame retardant imparting agent for resins when used in combination with an organic halogen compound. In this case, the thermal stability during heating and melting is significantly impaired, and not only does the appearance of the molded product have a silvery foam, but also the mechanical strength of the molded product is greatly reduced. However, according to the present invention, antimony trioxide can be expressed by the following general formula R ¹ -Si(-OR ² ) ₃ or Si(-OR ² ) ⁴ [where R ¹ is a hydrocarbon group having 1 to 25 carbon atoms ( may contain a vinyl group, a glycidyl group, and/or an amino group), and R ² has 1 to 15 carbon atoms.
is a hydrocarbon group. ] When used as a flame retardant additive treated with an alkoxysilane, the thermal stability during heating and melting is significantly improved, and even when molded at high temperatures, the molded product has an excellent appearance and high mechanical strength. You can get the goods. Preferred examples of the alkoxysilane include methyltrimethoxysilane, methyltriethoxysilane, methyltriisopropoxysilane, methyltributoxysilane, and methylsec-
Octyloxysilane, methyltriphenoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, vinyltriethoxysilane,
Examples include vinyltributoxysilane, tetra2-ethylhexylsilicate, tetranonylsilicate, tetratridecylsilicate, γ-glycidoxypropyltrimethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, etc. . The treatment of antimony trioxide with such alkoxysilane can be carried out by bringing antimony trioxide and alkoxysilane into contact with each other in the presence of water and drying. For example, (a) antimony trioxide is placed in a V-type blender and stirred. A method in which a 0.1 to 2% by weight aqueous alkoxysilane solution (or water-organic solvent solution) is treated while jetting with air or _N2 gas, and then dried; (b) Antimony trioxide is added to water or an organic solvent. A method in which the aqueous solution and/or organic solvent solution of alkoxysilane is added to the slurry, the alkoxysilane aqueous solution and/or organic solvent solution is added, the mixture is stirred, the mixture is allowed to stand still, the antimony trioxide is precipitated, and the antimony trioxide is separated and dried. Examples include a method of spraying antimony trioxide with an aqueous alkoxysilane solution and/or an organic solvent solution, but the method is not necessarily limited to these methods. Although the reason for the effect of improving the heat resistance of thermoplastic polyester by treating antimony trioxide with alkoxysilane is not clear,
The alkoxy group of the alkoxysilane reacts with the air or with water added during the treatment process to form a silanol group, which then undergoes dehydration condensation to form siloxane, so it is likely that the surface of the antimony trioxide is coated with a polysiloxane film. It is presumed that this is because the chemical reaction promoting ability of antimony trioxide is inactivated. The amount of antimony trioxide treated with alkoxysilane is per 100 parts by weight of the blend of thermoplastic polyester and thermoplastic polycarbonate.
As the amount of antimony element in antimony trioxide
The amount is 0.1 to 20 parts by weight, preferably 1 to 15 parts by weight.
If this amount is less than 0.1 part by weight, the effect as a flame retardant aid will not be sufficiently expressed. If the amount is more than 20 parts by weight, the flame retardant effect will be almost saturated, and the effect will not only hardly increase compared to when 20 parts by weight is added, but also the properties of the resulting resin composition will deteriorate, so it is preferable. do not have. The filler component (B) used in the present invention includes fibrous materials such as glass fiber, asbestos, carbon fiber, aromatic polyamide fiber, potassium titanate fiber, steel fiber, ceramic fiber, boron whisker fiber, asbestos, Such as mica, silica, talc, calcium carbonate, glass beads, glass flakes, clay, wollastonite, etc.
Examples include powder, granular, or plate-like inorganic fillers. These fillers are usually blended as reinforcing materials, surface modifiers, or for the purpose of modifying electrical, thermal, and other properties. Among these fillers, especially when glass fiber is used, mechanical strength It exhibits a number of features such as greatly improved heat resistance and reduced mold shrinkage. There are no particular limitations on the glass fiber as long as it can generally be used for reinforcing resins. For example, it can be selected from long fiber type (glass roving), short fiber type chopped strand, milled fiber, etc. Further, the glass fibers may be treated with a sizing agent (eg, polyvinyl acetate, polyester sizing agent, etc.), a coupling agent (eg, silane compound, borane compound, etc.), or other surface treatment agent. Furthermore, it may be coated with a resin such as a thermoplastic resin or a thermosetting resin. usually,
Long fiber type glass fibers are used by being cut into a desired length before or after blending with the resin, and this mode of use is also useful in the present invention. The amount of filler added is 0 to 200 parts by weight per 100 parts by weight of the blend of thermoplastic polyester and thermoplastic polycarbonate. Preferably 5~
It is 200 parts by weight. Any method of compounding can be used to obtain the resin compositions of the present invention. Generally, it is preferable to disperse these ingredients more uniformly, and there are methods of homogenizing all or part of them simultaneously or separately using a mixer such as a blender, kneader, roll, press, etc., and methods of homogenizing the mixed ingredients. Some of them can be used simultaneously or separately, such as blenders, kneaders, etc.
Mix using a roll, extruder, etc., and then add the remaining ingredients.
A method of mixing and homogenizing using these mixers or extruders can be used. The most common method is to melt and knead a previously dry-blended composition in a heated extruder to homogenize it, extrude it into wires, and then cut it into desired lengths and granulate it. . The resin composition thus produced is usually sufficiently dried, kept in a dry state, and placed into a molding machine hopper for molding. Other methods include, for example, a method in which other components are added or mixed during the production of the thermoplastic polyester, before the polycondensation, after the polycondensation, or during the polycondensation. In particular, when using glass fiber as a filler, avoid crushing it as much as possible during kneading.
In addition, for the purpose of improving workability during composition production,
It may be dry blended without melt-kneading in an extruder together with other ingredients, for example, a glass fiber-free composition granule made in an extruder and a predetermined amount of glass chopped strands or A composition mixed with a thermoimageable resin containing a high glass fiber content which has been prepared in advance can also be charged into a molding machine hopper and subjected to molding. The resin composition of the present invention may further contain various additives for the purpose of improving other properties. For example, inorganic substances such as talc, graphite, aluminum silicate, clay, etc. can be added in effective amounts to promote crystallization during molding and improve the molding cycle. Further, flame retardants other than organic halogen compounds, such as red phosphorus and phosphorus compounds such as phosphonic acid amide, can also be added. Furthermore, for the purpose of improving heat resistance, antioxidants such as hindered phenol compounds and sulfur compounds, or heat stabilizers such as phosphorus compounds may be added. As the phosphorus compound added for this purpose, compounds represented by the following general formulas (i) and (ii) are particularly desirable.

【formula】 [However, in the formula, X ¹ , Y ¹ and Z ¹ are each a hydrogen atom, -OR'' (where R'' is a hydrogen atom or a monovalent hydrocarbon group), or a monovalent hydrocarbon group. ]

The monovalent hydrocarbon group in the above formula has 12 carbon atoms.
The following alkyl groups, aralkyl groups, aryl groups, etc. are preferred. Examples of the alkyl group include methyl, ethyl, propyl, isopropyl, butyl, bentyl, hexyl, cyclohexyl, octyl, decyl, etc., and examples of the aryl group include phenyl, naphthyl, methylphenyl, phenylphenyl, brominated phenyl, etc. Furthermore, benzyl is exemplified as aralkyl. Specific examples of phosphorus compounds include phosphoric acid, trimethyl phosphate, methyl diethyl phosphate, triethyl phosphate, triisopropyl phosphate, tributyl phosphate, triphenyl phosphate, and other phosphoric acid esters; trimethyl phosphite, phosphorous Phosphite esters such as triethyl acid and triphenyl phosphite; phosphonic acids, phenylphosphonic acid, phenyl phenylphosphonate, and their derivatives; phosufonic acid, phenylphosfunic acid, dimethylphosfunic acid Examples include phosphinic acids such as and derivatives thereof. Among these, particularly desirable are trimethyl phosphate,
It is a (sub)phosphoric acid ester such as triphenyl (sub)phosphate. These phosphorus compounds can be used alone or in combination of two or more. Furthermore, various epoxy compounds may be added for the purpose of improving melt viscosity stability and hydrolysis resistance. Examples of epoxy compounds include bisphenol A type epoxy compounds obtained by reacting bisphenol A and epichlorohydrin, aliphatic glycidyl ethers obtained by reacting various glycols or glycerol with epichlorohydrin, and novolac type epoxy compounds obtained from novolac resins and epichlorohydrin. Preferable epoxy compounds are alicyclic compound-type epoxy compounds obtained from compounds and alicyclic compounds, and particularly preferable epoxy compounds include bisphenol A-type epoxy compounds, diglycidyl ethers of low molecular weight polyethylene glycol, and diglycidyl esters of aromatic dicarboxylic acids. etc. Examples of other additives include ultraviolet absorbers, antioxidants, colorants, lubricants, and antistatic agents. Also, in small proportions, other thermoplastic resins such as styrene resins, acrylic resins, polyethylene, polypropylene, fluororesins, polyamide resins, polysulfonic acids: thermosetting resins such as phenolic resins, melamine resins, unsaturated polyester resins, silicone resins etc.: Furthermore, a soft thermoplastic resin such as ethylene-vinyl acetate copolymer, polyester elastomer, etc. may be added. The resin composition of the present invention can be easily molded by a conventional method using a general thermoplastic resin molding machine. Hereinafter, the present invention will be explained in detail with reference to Examples. In addition, the intrinsic viscosity of the thermoplastic polyester described in the examples is a value measured at 35° C. in an orthochlorophenol solution. Moreover, "parts" means parts by weight. Furthermore, static strength and flame retardancy were measured by the following method. (1) Static strength: Tensile test: Conforms to ASTM D-638 Impact strength: Conforms to ASTM D-256 (Thickness: 1/8" without notch) (2) Flame retardancy: Underwriters Laboratories, USA Conforms to Standard Subject 94 (UL-94). A test piece measuring 5" in length x 1/2" in width x 1/16" in thickness is molded using the injection molding method. Reference example A (alkoxysilane treated antimony trioxide-A
100 parts of water and 2 parts of 1N hydrochloric acid were added to 100 parts of antimony trioxide. Four parts of 25% acetone solution was added dropwise and mixed uniformly. The mixture was then transferred to a stainless steel pouch and dried in a dryer set at 120°C. Reference example B (alkoxysilane treated antimony trioxide-B
1 part of phenyltrimethoxysilane (manufactured by Daihachi Kagaku Kogyo Co., Ltd.; trade name PTS-31) was added to a mixed solution of t-butanol/diacetone alcohol (50/50%).
This solution was then added to 100 parts of water to which 2 parts of 1N hydrochloric acid had been added while stirring.
50 parts of the obtained aqueous solution was sprayed onto the surface of 100 parts of antimony trioxide, and then dried in a dryer set at 130°C. Examples 1-2 and Comparative Examples 1-2 46 parts of polyethylene terephthalate with an intrinsic viscosity of 0.71 dried at 130°C for 10 hours, disphenol A polycarbonate (Teijin Kasei Ltd., Panlite) dried at 120°C for 5 hours L-1250, average molecular weight
25000) 10 parts, 30 parts of glass chopped strands 3 mm long, brominated polystyrene (Nissan Ferro
Co., Ltd., Pyrocheck 68PB, bromine content 68wt
%), 2 parts of talc (Hayashi Kasei Co., Ltd., PKN), and 2 parts of surface-treated antimony trioxide (reference example A) or 2 parts of untreated antimony trioxide,
The mixture was uniformly mixed in advance using a V-type blender, then melt-kneaded in a 65 mmφ single-screw extruder at a barrel temperature of 270°C, and the thread discharged from the die was cooled and cut to obtain pellets for molding. Next, this pellet was dried with hot air at 130°C for 5 hours, and a test piece mold for measuring physical properties was attached to a 5-ounce injection molding machine, and the mold temperature was 140°C.
The cylinder temperature was changed as shown in Table 1, and test pieces were molded under the following molding conditions: injection pressure: 800 Kg/cm ² , cooling time: 20 seconds, and total cycle time: 35 seconds. The properties of the molded article thus obtained are shown in Table-1.

[Table] As is clear from the results in Table 1, the systems containing antimony trioxide treated with alkoxysilane (Examples 1 and 2) have a good appearance and high static strength, and also have a low heat of fusion. Although a composition with excellent stability is obtained, when untreated antimony trioxide is blended (Comparative Examples 1 and 2), both appearance and strength are poor. In particular, when the molding temperature is increased to 300°C, the strength is extremely reduced, fine bubbles are observed on the surface of the molded product, and the so-called sagging phenomenon during molding increases. Furthermore, the flammability of the test piece was poor because the molten resin dripped during the test and ignited the cotton. Example 3 and Comparative Example 3 70.7 parts of polybutylene terephthalate (intrinsic viscosity 1.01) dried at 120°C for 5 hours, 12.9 parts of bisphenol A polycarbonate (Teijin Kasei Ltd., Panlite L-1250) dried under the same conditions. , 0.9 parts of triphenyl phosphate, 8.6 parts of brominated bisphenol A polycarbonate oligomer, 1.7 parts of brominated epoxy compound, and 5.2 parts of alkoxysilane-treated (from Reference Example B) or untreated antimony trioxide.
After pre-mixing the parts uniformly, the barrel temperature
The mixture was melt-kneaded and extruded at 250°C using a 65 mmφ vented single screw extruder to obtain pellets. Using the pellets obtained, the cylinder temperature was 270°C.
℃, a mold temperature of 60℃, and an injection pressure of 800Kg/cm ² to form test pieces for measuring physical properties, and the properties of the molded products were compared.
These results are shown in Table-2. The brominated bisphenol A-based polycarbonate oligomer used here is a polycarbonate oligomer obtained from tetrabromobisphenol A and phosgene (Teijin Kasei Ltd., FR-7100,
Average degree of polymerization: 17, bromine content 52wt%),
In addition, the brominated epoxy compound is obtained by the condensation reaction of tetrabromobisphenol A and epichlorohydrin (Hitachi Chemical Co., Ltd., HR-128F,
Epoxy equivalent: 1800, bromine content: 50wt%).

[Table] As is clear from the results in Table 2, the system to which alkoxysilane-treated antimony trioxide was added had a better appearance and greater strength than the system using untreated antimony trioxide.

Claims (1)

[Scope of Claims] 1 (A) Per 100 parts by weight of a mixture consisting of 1 to 99% by weight of thermoplastic polyester and 99 to 1% by weight of thermoplastic polycarbonate, (B) 0 to 200 parts by weight of filler (C) Organic halogen Compound as halogen element amount
0.1 to 30 parts by weight, and (D) 0.1 to 20 parts by weight of antimony trioxide treated with an alkoxysilane as an antimony element amount.