Abstract: A thermoplastic resin composition comprises: about 100 parts by weight of a polycarbonate resin; about 50 parts by weight to about 250 parts by weight of a polyester resin; about 10 parts by weight to about 200 parts by weight of an aromatic polyphosphonate having a weight average molecular weight of about 65,000 g/mol to about 130,000 g/mol; and about 0.1 parts by weight to about 2 parts by weight of an organic acid comprising citric acid, lactic acid, malic acid, tartaric acid, and/or glycolic acid.

Abstract: This invention relates to a polymer composition comprising: (A) at least one semi-crystalline polymer, and (B) a stabilizer composition comprising: (1) at least one primary antioxidant comprising at least one phenolic antioxidant; and (2) at least one secondary antioxidant comprising at least one phosphite, and (3) at least one chain extending agent; wherein the b* value for said polymer composition is less than 10 according to the L*, a* and b* color system of the CIE (International Commission on Illumination) after being heated for at least three hours at 200° C. or 24 hours at 175° C.

Abstract: The invention relates to a thermoplastic polymer composition comprising A. a polyamide B. a reinforcing agent, and C. an laser direct structuring (LDS) additive wherein the polyamide comprises a blend of —(A.1) a semi-crystalline semi-aromatic polyamide, and —(A.2) an amorphous semi-aromatic polyamide or an aliphatic polyamide, or a mixture thereof; or a blend of —(A.3) a semi-crystalline aliphatic polyamide, and —(A.4) an amorphous semi-aromatic polyamide; and D. a metal (di)phosphinate. The present invention further relates an article prepared form the thermoplastic polymer composition, and article made by a LDS process and a process for preparing the same.

Abstract: The invention relates to a flame retardant mixture comprising 99.9999% to 87% by weight of diorganylphosphinic acid salts as component A) and 0.0001% to 13% by weight of iron as component B), where the sum total of A) and B) is 100% by weight. The invention likewise relates to processes for producing the aforementioned flame retardant mixture and to the use thereof.

Abstract: A composition for injection molding includes specific amounts of a poly(phenylene ether), a first hydrogenated triblock copolymer, a second hydrogenated triblock copolymer, a polypropylene, a polybutene, an ethylene/1-octene copolymer, and a flame retardant. At least one of the first and second hydrogenated triblock copolymers has a pre-hydrogenation vinyl content of 50 to 100 mole percent, based on moles of incorporated polybutadiene. Injection molded articles prepared from the composition include cable connectors and their parts.

Abstract: The invention relates to a fibre composite (42) comprising at least one fibre layer (4, 14, 16) composed of a fibre material which is embedded in a matrix (8, 18) based on a thermoplastic, where the composition of the matrix (8, 18) contains: 60-95 parts by weight of aromatic polycarbonate and/or aromatic polyester carbonate and further additives. The invention further relates to the use of such a fibre composite for a component for a rail vehicle, in particular for a rail vehicle for transporting passengers.

Abstract: Polyamide moulding composition in particular for railway applications consisting of: (A) from 50 to 90% by weight of a polyamide matrix consisting of (A1) polyamide 12 and optionally (A2) up to 85% by weight of polyamide elastomer based on polyamide 12; (B) from 7 to 28% by weight of flame retardant consisting of (B1) at least one metal phosphinate, and also optionally (B2) up to 40% of a nitrogen-containing synergist and/or at least one nitrogen- and phosphorus-containing flame retardant; (C) from 3 to 15% by weight of plasticizer; (D) from 0 to 15% by weight polyolefin; (E) from 0 to 10% by weight of additives and/or particulate fillers, with exclusion of fibrous reinforcing materials; where the entirety of (C) and (D) is from 3 to 20% by weight, based on the entire moulding composition, and where the entirety of (A) to (E) provides 100% by weight.

Abstract: In an example, a process includes polymerizing a mixture that includes an ethylene monomer, a propylene monomer, and a diene monomer to form an ethylene-propylene-diene (EPDM) terpolymer using ring-opening metathesis polymerization (ROMP). The process further includes chemically reacting the EPDM terpolymer with a norbornene-based phosphinate cross-linking material to form a flame-retardant, cross-linked EPDM rubber.

Abstract: The present invention relates to halogen-free flame retardant compositions essentially comprising polyamide polymers (preferred is polyamide 6), at least a hypophosporous acid metallic salt (preferred is aluminum hypophosphite), at least a nitrogen based flame retardant agent (preferably selected among melamine condensation products such as melam, melem, melon or their mixtures, and melamine cyanurate), at least an organic polyhydric compound and optionally further conventional components. Such compositions are highly flame retardant.

Abstract: A flame-retardant biaxially oriented polyester film is obtained by imparting flame retardancy to a polyester film itself using a phosphorus flame retardant, a flame-retardant polyester film laminate is formed from the same, and a flexible circuit board is provided. The present invention is obtained from a flame-retardant biaxially oriented polyester film which contains, based on the weight of the polyester film, 70 to 99.5% by weight of polyethylene terephthalate or polyethylene naphthalate, and 0.5 to 30% by weight of flame retardant particles having an average particle diameter of 0.5 to 3.0 ?m and being represented by a specific phosphinate or diphosphinate, wherein the number of coarse particles having a maximum length of 10 ?m or more contained in the polyester film is 10/m2 or less.

Abstract: Articles exhibiting flame retardancy and heat resistance are fabricated from a composition that includes specific amounts of a poly(phenylene ether)-polysiloxane block copolymer reaction product, a flame retardant, and a reinforcing filler. Articles benefiting from the composition's properties include fuser holders for electrophotographic copiers, fan blades, battery parts for hybrid and electric vehicles, parts for automotive kinetic energy recovery systems, and electric vehicle junction boxes.

Abstract: A composition, which comprises a) an organic material susceptible to oxidative, thermal or light-induced degradation; and b) a compound of formula I (Formula I) (I) where R1, R2, R3, R4, R5, R6, R7, R8, R9 and R10 are independently from each other H, C1-C8-alkyl, C4-C8-cycloalkyl, phenyl, C1-C4-alkoxy or halogen; n is 1, 2, 3, or 4; and when n is 1 A is —C(=0)-OR?1, —C(=0)-N(R?2)(R?3), —CN, phenyl, which is unsubstituted or substituted by one or more C1-C8-alkyl, C4-C8-alkoxy, C5-C7-cycloalkyl or halogen, —H or —S02-phenyl; when n is 2 A is —C(=0)-0-Z1—O—C(=0)-, —C(=0)-N(R?1)—Z2—N(R?2)—C(=0)- or piperazine-N,N?-biscarbonyl.

Abstract: The invention relates to a flame retarded thermoplastic moulding composition comprising (A) a polyamide (B) a flame retardant system comprising a metal salt of a phosphinic acid and/or a diphosphinic acid; and either (C) a fibrous reinforcing agent; or (D) an inorganic filler; or a combination of (C) and (D), wherein (A) consists primarily of a semi-crystalline semi-aromatic polyamide (A1) with a melting temperature of at least 310° C. and consisting of repeat units, predominantly derived from terephthalic acid and diamines selected from C2-C8 diamines and having a molar average number of carbon atoms of at most 7.

Abstract: The present invention relates to a composition containing a polyamide matrix having high thermal conductivity, and including a nitride and a metal oxide, as well as, optionally, a flame-retardant system. Said composition can be used in particular for producing components for lighting apparatuses including light-emitting diodes.

Abstract: In an example, a process includes polymerizing a mixture that includes an ethylene monomer, a propylene monomer, and a diene monomer to form an ethylene-propylene-diene (EPDM) terpolymer using ring-opening metathesis polymerization (ROMP). The process further includes chemically reacting the EPDM terpolymer with a norbornene-based phosphinate cross-linking material to form a flame-retardant, cross-linked EPDM rubber.

Abstract: The present invention relates to a thermoplastic composition that provides improved thermal aging stability along with durability. The thermoplastic composition comprises a polyamide resin, and a polyhydric alcohol, wherein a majority of the polyhydric alcohol particles have a particle size that is less than about 70 microns. It has been found that a combination of a polyamide resin and a polyhydric alcohol with this particle size produces a superior product demonstrating greater thermal stability and durability than the polyamide resin alone.

Abstract: The polyamide production method of the present invention comprises the steps of: producing a low-order condensate by effecting a polycondensation reaction between a dicarboxylic acid component containing between about 5 and about 40 mol. % of terephthalic acid, and a diamine component containing between about 70 and about 100 mol. % of a xylylenediamine in which the content of paraxylylenediamine is between about 50 and about 100 mol. %, under conditions of a reaction temperature of at least about 200° C. and less than about 230° C.; discharging and cooling the low-order condensate at a pressure at or below atmospheric pressure, in an inert gas atmosphere; and subjecting the discharged and cooled low-order condensate to solid state polymerization. The production method makes it possible to obtain a polyamide having outstanding mechanical strength, heat resistance, color tone and the like without problems such as gelling.

Abstract: Disclosed is a method for manufacturing a composite material, which includes performing press molding of a fiber matrix structure including reinforcing fibers and a matrix resin mainly including a polyester-based resin having a crystallization temperature of 185° C. or lower. Furthermore, the polyester-based resin is preferably a polyester-based copolymer. In addition, it is preferred that the matrix resin includes a carbodiimide, and that the carbodiimide has a cyclic structure. Moreover, it is preferred that the press molding is cold pressing in which a die temperature is 170° C. or lower; that the reinforcing fibers are carbon fibers; and that the discontinuous fibers are randomly oriented in the structure.

Abstract: The present invention relates to a polyamide obtainable by polymerizing an (a) dicarboxylic acid comprising at least 50 mol % of an alicyclic dicarboxylic acid and a (b) diamine comprising at least 50 mol % of a diamine having a substituent branched from a main chain.

Abstract: (Problems to be solved) Provision of a polyamide composition with good heat resistance, stability under heating, heat resistant color tone stability, reflow heat resistance properties and fogging properties. (Solution) A polyamide obtained by polymerizing (a) a dicarboxylic acid containing at least 50 mol % of an alicyclic dicarboxylic acid and (b) a diamine containing at least 50 mol % of a diamine having a pentamethylenediamine skeleton, wherein the polyamide has a cyclic amino end content of less than 30? equivalents/g.

Abstract: A process for preparing high melt strength propylene polymers is provided. The process comprises: blending base propylene polymers with 0.1 to 1% w/w of polyfunctional acrylate monomer, in the presence of 10 to 50 ppm organic peroxide and 0.2 to 20% w/w of an additive such as stabilizer, acid neutralizer, antioxidants or lubricants. The high strength modified propylene polymers obtained have 30 to 60% of increased melt strength than that of the base propylene polymers.

Abstract: The invention relates to compositions, especially thermoplastic moulding compositions, comprising polyethylene terephthalate (PET), poly(1,4-cyclohexanedimethanol terephthalate) (PCT), glass fibres and talc, to the use of these compositions in the form of moulding compositions for production of products resistant to heat distortion for short periods, and to a process for producing polyester-based products resistant to heat distortion for short periods, preferably polyester-based electric or electronic products, especially polyester-based optoelectronic products.

Abstract: The invention relates to compositions comprising polyethylene terephthalate (PET), poly(1,4-cyclohexanedimethanol terephthalate) (PCT) and titanium dioxide, to the use of these compositions for production of products resistant to heat distortion for short periods, and to a process for producing polyester-based products resistant to heat distortion for short periods, preferably electric or electronic polyester-based products, especially polyester-based optoelectronic products.

Abstract: A polymer complex is disclosed which is the reaction product of one or more polymers having a terminal or pendant hydroxyl group, or a terminal or pendent carboxyl group, or combinations thereof, with at least one metal complex and one alkyl phosphate. This polymer complex acts as an adhesion promotion agent as well as a viscosity stabilizer when formulated in a printing ink or coating.

Abstract: Varnishes useful in manufacturing prepregs and laminates including at least one polymer selected from the group consisting of polyphenylene ether, polyphenylene oxide and combinations thereof; at least on reactive monomer; and at least one initiator.

Abstract: The present invention relates to a polyamide composition comprising (amounts are based on the total composition) (A) polyamide, (B) melamine cyanurate and (C) talcum as mineral filler wherein the amount of talcum is higher than 25 wt %, and the weight ratio melamine cyanurate/talcum is higher than ? and to articles made wholly or partly of this polyamide composition. The polyamide is preferably polyamide 6. The composition is commonly used in the industry of for instance electrical and electronic parts and preferably in miniature circuit breakers.

Abstract: A flame retardant polyamide resin composition includes (A) about 40 to about 60% by weight of a crystalline polyamide resin, (B) about 10 to about 20% by weight of polyphenylene sulfide resin, (C) about 5 to about 15% by weight of flame retardant containing phosphinic acid metal slat compound, (D) about 20 to about 40% by weight of glass fiber and (E) about 0.1 to about 1% by weight of phosphite antioxidant. The flame retardancy polyamide resin composition can have excellent mechanical properties such as impact strength, flexural modulus, flexural strength and/or tensile strength and can exhibit reduced gas blistering on a surface of a specimen thereof.

Abstract: Certain phosphonic acid salts heated at temperatures over 200° C. generate thermally stable, highly efficient flame retardant materials well suited for use as flame retardant additives in polymers. The flame retardants of the invention can be used as the sole flame retardant in a composition or in combination with other flame retardants, synergists or adjuvants.

Abstract: The present invention discloses modified polypropylene composition with higher flow activation energy and reduced necking in extrusion film/coat, wherein composition comprises long chain branch of polypropylene; free radical initiator; primary antioxidant; secondary antioxidant; acid neutralizer; optionally multifunctional monomer. Further the said composition of polypropylene shows higher sensitivity of viscosity to temperature, with improved stretchability.

Abstract: The invention relates to mixtures of at least one diphosphinic acid of the formula (I) in which R1, R2 are the same or different and are each independently H, C1-C18-alkyl, C2-C18-alkenyl, C6-C18-aryl, C7-C18-alkylaryl, R5 is C1-C18-alkylene, C2-C18-alkenylene, C6-C18-arylene, C7-C18-alkylarylene with at least one dialkylphosphinic acid of the formula (II) in which R3, R4 are the same or different and are each independently C1-C18-alkyl, C2-C18-alkenyl, C6-C18-aryl and/or C7-C18-alkylaryl. The invention also relates to a process for preparing these mixtures and to the use thereof.

Abstract: To provide a polybutylene terephthalate resin composition having excellent tracking resistance, mechanical strength, and low-hygroscopicity, and being flame-retarded by a non-halogen-containing flame retardant. A polybutylene terephthalate resin composition is prepared by compounding polyamide resin, an organic phosphorous flame retardant, and a nitrogen-containing flame retardant assistant into polybutylene terephthalate resin, wherein the content of the polyamide resin is not less than 1 part by mass and not more than 15 parts by mass to 100 parts by mass of the polybutylene terephthalate resin.

Abstract: The present disclosure provides a flexible, halogen-free, flame retardant composition. The composition includes from about 25 wt % to about 95 wt % of a thermoplastic polyurethane (TPU); from about 5 wt % to about 50 wt % of an olefin block copolymer (OBC); and from about 30 wt % to about 70 wt % of a flame retardant. The flame retardant is selected from resorcinol bis(diphenyl 5 phosphate) (RDP), bis diphenyl phosphate (BDP), bisphenol-A bis(diphenyl phosphate) (BPADP), aluminum trihydrate (ATH), a nitrogen/phosphorus-based halogen-free flame retardant, epoxidized novolac resin, and combinations thereof. The composition requires no compatibilizer for the TPU and OBC. The composition finds application in wire and cable structures.

Abstract: Interior aircraft components comprise a thermoplastic composition comprising: a first polymer comprising bisphenol A carbonate units and monoaryl arylate units, or a second polymer comprising bisphenol A carbonate units, monoaryl arylate units, and siloxane units, or a combination comprising at least one of the foregoing polymers; and an organophosphorus compound; wherein a sample of the thermoplastic composition has: an OSU integrated 2 minute heat release test value of less than 65 kW-min/m2 and a peak heat release rate of less than 65 kW/m2, an E662 smoke test DsMax value of less than 200, a flame time of less than 15 seconds, a burn length of less than 6 inches, and a drip extinguishing time of less than 5 seconds, an energy in multiaxial impact of 100 J or more and a ductility in multiaxial impact of 100%.

Abstract: Provided is an integrated molded product in which a molded resin product containing a phosphorus compound is used and an addition-reactive silicone adhesive agent is used to achieve strong bonding. The integrated molded product comprises a thermoplastic resin molded product made of a thermoplastic resin composition comprising a polybutylene terephthalate resin and a phosphorus compound, the content of the phosphorus compound being 0.5% by mass or less; an addition-reactive silicone composition; and a member; and the thermoplastic resin molded product and the addition-reactive silicone composition are brought into contact with each other. The phosphorus compound to be used is preferably a trivalent phosphorous compound.

Abstract: The invention relates to a method for producing mixtures of alkylphosphonous acid and dialkylphosphinic acid salts, characterized in that a) a phosphinic acid source (I) is reacted with olefins (II) in the presence of a catalyst A to obtain a mixture of alkylphosphonous acid (III) and dialkylphosphinic acid (IV) or salts or esters thereof, and b) the thus obtained mixture of alkylphosphonous acid (III) and dialkylphosphinic acid (IV) or the salts or esters thereof is reacted with metal compounds of Mg, Ca, Al, Sb, Sn, Ge, Ti, Fe, Zr, Zn, Ce, Bi, Sr, Mn, Li, Na, K and/or a protonated nitrogen base to obtain the corresponding mixtures of alkylphosphonous acid salt (V) and dialkylphosphinic acid salt (VI) of said metals and/or a nitrogen compound, (V) (VI), wherein Y represents Mg, Ca, AI, Sb, Sn, Ge, Ti, Fe, Zr, Zn, Ce, Bi, Sr, Mn, Li, Na; K and/or a nitrogen compound and n represents ¼, ?, ½, 1.

Abstract: The present invention relates to a flame retardant plexifilamentary film-fibril strand comprising at least one polyolefin and at least one flame retardant selected from the group consisting of: phosphate esters, phosphonate esters, phosphinate esters, polyphosphazines, nitrogen-containing polyphosphates, hindered amines and mixtures thereof. The present invention also relates to flame retardant sheet made from the flame retardant plexifilamentary film-fibril strands. The sheet can be made into a flame retardant building substrate, garment, banner, light reflector and cover.

Abstract: The present invention provides an insulating film including: a (A) binder polymer; (B) spherical organic beads; and (C) fine particles containing at least one element selected from the group consisting of phosphorus, aluminum, and magnesium, both the (B) spherical organic bead and the (C) fine particles being dispersed in a predetermined state in the insulating film.

Abstract: Interior railway components (seat covers and claddings) comprise a thermoplastic composition comprising: a first polymer comprising bisphenol A carbonate units and monoaryl arylate units, or a second polymer comprising bisphenol A carbonate units, monoaryl arylate units, and siloxane units, or a combination comprising at least one of the foregoing polymers; and an organophosphorus compound; wherein a sample of the thermoplastic composition has: a smoke density after 4 minutes (Ds-4) of equal to or less than 300, an integral of the smoke density as a function of time up to 4 minutes (VOF4) of equal to or less than 600, a maximum average heat release (MAHRE) of equal to or less than 90 kW/m2, and a ductility in multiaxial impact of 100%.

Abstract: The invention relates to mixtures of at least one diphosphinic acid of the formula (I) in which R1, R2 are each H, C1-C18-alkyl, C2-C18-alkenyl, C6-C18-aryl, C7-C18-alkylaryl R4 is C1-C18-alkylene, C2-C18-alkenylene, C6-C18-arylene, C7-C18-alkylarylene with at least one alkylphosphinic acid of the formula (II) in which R3 is C1-C18-alkyl, C2-C18-alkenyl, C6-C18-aryl, C7-C18-alkylaryl. The invention also relates to a process for preparing these mixtures and to the use thereof.

Abstract: The present invention relates to flame retardant polymer compositions which comprise melamine phenylphosphinates and mixtures with dihydro-oxa-phosphaphenanthrene derivatives. The compositions are especially useful for the manufacture of flame retardant compounds based on polyfunctional epoxides or polycondensates like polyesters, polyamides and polycarbonates.

Abstract: Disclosed herein is a reinforced composition comprising: 55 to 80 wt % of a compatibilized blend of a polyphthalamide and a poly(phenylene ether) wherein said compatibilized blend is formed from a mixture of polyphthalamide and poly(phenylene ether) in a ratio of between 1.5:1 and 7.0:1, and a functionalizing agent in an amount sufficient to effect compatibilization; and 20 to 45 wt % of a nylon glass fiber, wherein the composition contains less than 0.1 wt % of phosphinates and less than 0.1 wt % of impact modifiers and weight percent is based on the total weight of the composition.

Abstract: A resin composition contains: (A) 100 parts by weight of the cyanate ester resin; (B) 5 to 80 parts by weight of the styrene-maleic anhydride copolymer; (C) 15 to 80 parts by weight of the styrene-butadiene-divinyl benzene (SBDVB) terpolymer; and (D) 5 to 60 parts by weight of the acrylate compound, where the contents of the styrene-maleic anhydride copolymer, the styrene butadiene divinyl benzene terpolymer, and the acrylate compound are based on 100 parts by weight of the cyanate ester resin. By providing such formulation, the resin composition of the present invention exhibits low dielectric constant, low dielectric dissipation, high thermal stability and high flame resistance, and is useful in manufacturing a prepreg or a resin film, and is further useful in manufacturing a laminate and a printed circuit board.

Abstract: This disclosure relates to thermoplastic compositions comprising a polycarbonate copolymer, the polycarbonate copolymer comprising first repeating carbonate units and second repeating units selected from carbonate units that are different from the first carbonate units, polysiloxane units, and a combination comprising at least one of the foregoing unit; and an organophosphorus flame retardant in an amount effective to provide 0.1 to 1.0 wt % phosphorus based on the total weight of the composition, wherein an article molded from the composition has a smoke density after 4 minutes (Ds-4) of less than or equal to 600 determined according to ISO 5659-2 on a 3 mm thick plaque, and a material heat release of less than or equal to 160 kW/m2 determined according to ISO 5660-1 on a 3 mm thick plaque.

Abstract: A block copolymer formulation is provided including a block copolymer blend including a first poly(acrylate)-b-poly(silyl acrylate) block copolymer; and, a second poly(acrylate)-b-poly(silyl acrylate) block copolymer. Also provided are substrates treated with the block copolymer formulation.

Abstract: A copolymer composition is provided including a block copolymer having a poly(styrene) block and a poly(silyl acrylate) block; wherein the block copolymer exhibits a number average molecular weight, MN, of 1 to 1,000 kg/mol; and, wherein the block copolymer exhibits a polydispersity, PD, of 1 to 2. Also provided are substrates treated with the copolymer composition.

Abstract: A thermoplastic polyester resin composition comprising 100 parts by weight of a thermoplastic polyester resin (A), 5 to 40 parts by weight of a phosphinate (B), and an organosiloxane (X); wherein the phosphinate is a calcium salt or aluminum salt of phosphine acid having the anion part having a particular structure; which, as the organosiloxane (X), comprises 1.5 to 10 parts by weight of an organosiloxane compound (X-1) or 0.01 to 5 parts by weight of an organosiloxane polymer (X-2), relative to 100 parts by weight of the thermoplastic polyester resin (A); and wherein the organosiloxane compound (X-1) comprises organic groups bonding to a silicon atom directly or through an oxygen atom, and 40 mole % or more of the organic groups are an aryl group, and the organosiloxane polymer (X-2) is in the form of solid at 25° C.

Abstract: Disclosed herein is a flame resistant composition comprising a compatibilized blend of a polyphthalamide and a poly(arylene ether); and a phosphinate, wherein the composition is substantially free of linear aliphatic polyamides.

Abstract: The present invention relates to polyalkylene terephthalate/polycarbonate compositions, containing A) 49 to 70 parts by weight aromatic polycarbonate, B) 21 to 40 parts by weight polyalkylene terephthalate with more than 2 carbons in the diol component, C) 6 to 25 parts by weight of a salt of a phosphinic acid, D) 0 to 24 parts by weight conventional additives, all parts by weight in the present application being standardized such that the sum of the parts by weight of components A+B+C+D in the composition adds up to 100, and which are distinguished by an optimum combination of low molding shrinkage, high chemical resistance and good heat resistance together with good fire behavior, the use of the polycarbonate compositions for the production of moldings and the moldings themselves.

Abstract: The present invention is directed to a composition comprising: (a) a polyethylene terephthalate; (b) a copolycarbonate of 2-phenyl-3,3-bis(4-hydroxyphenyl)phthalimidine (PPPBP) and another bisphenol; (c) a polycarbonate-polysiloxane copolymer; and (d) a non-halogenated flame retardant. The invention is also directed to processes for making such compositions as well as articles derived therefrom.

Abstract: Disclosed herein is a resin composition for molding a reflector for a light-emitting semiconductor diode comprising about 25 to about 80 wt. % of an heat-resistant aromatic polyester, about 5 to 50 wt. % of titanium dioxide filler; and about 5 to 50 wt. % of a glass fibers having a flat surface. In another aspect of the present invention, there is also provided a reflector for a light-emitting semiconductor element, which includes a molded product of the resin composition. In a further aspect of the present invention, there is also provided a light-emitting semiconductor unit comprising a light-emitting semiconductor diode element, leads connecting electrodes of the light-emitting semiconductor diode element with external electrodes, respectively, and the reflector.