Abstract: Flame-retardant thermoplastic molding compositions having improved physical and electrical arc track resistant properties are provided, the compositions comprising an intimate admixture of(a) a high molecular weight poly(1,4-butylene terephthalate) homo- or co-polyester,(b)(i) a copolymer of ethylene and vinyl acetate in combination with an aromatic polycarbonate;(ii) poly(ethylene terephthalate); or(iii) reinforcing glass;(c) a flame retardant agent; and(d) a mineral filler.

Abstract: Flame-retarded, reinforced and unreinforced thermoplastic compositions having improved arc resistance are provided comprising a high molecular weight linear polyester, such as poly(1,4-butylene terephthalate) and the like, a flame-retarding amount of a flame-retardant, such as an aromatic polycarbonate and a particulate material selected from the group consisting of finely divided mica and finely divided clay. A process for improving the arc resistance of reinforced or unreinforced flame retardant polyester compositions is also provided, the process comprising admixing finely divided mica or finely divided surface treated clay with a high molecular weight linear polyester and a flame-retardant.

Abstract: Normally flammable polyester resins (a) are rendered flame-retardant with reduced blooming or plate out tendencies and without loss in toughness or other properties in combination with (b) a flame retardant amount of decabromodiphenyl ether and (c) a flame-retardant synergist compound, by including a small amount of (d) an olefin polymer and/or an olefin copolymer. The compositions, which are useful per se for molding, extrusion, and the like, are, in addition, described in impact modified resin compositions and filled and/or reinforced modifications.

Abstract: A thermoplastic molding composition having improved mold release properties is provided, the composition comprising a thermoplastic resin selected from the group consisting of a high molecular weight linear polyester and a high molecular weight block copolyester, from about 0.1 to 4.5% by weight, based on the total composition, of a polyolefin or olefin-based copolymer, and, optionally, from about 0.02 to 0.5% by weight, based on the total composition, of talc.

Abstract: Modified thermoplastic polyester compositions are provided which comprise (a) a poly(1,4-butylene terephthalate) resin or polyester compolymer and, optionally, a poly(ethylene terephthalate) resin and (b) a modifier therefor comprising a combination of a polyacrylate resin and an aromatic polycarbonate, and, optionally (c) filler and/or reinforcing agent and/or (d) a flame retardant. Modifier (b) provides enhanced resistance to impact fracture, increased strength and improved resistance to heat distortion in articles molded from the compositions.

Abstract: Flame-retarded, reinforced and unreinforced thermoplastic compositions having improved arc resistance are provided comprising a high molecular weight linear polyester, such as poly(1,4-butylene terephthalate) and the like, a flame-retarding amount of a flame-retardant, such as a halogenated aromatic polycarbonate, and novaculite. A process for improving the arc resistance of reinforced or unreinforced flame-retardant polyester compositions is also provided, the process comprising admixing novaculite with a high molecular weight linear polyester and a flame retardant.

Abstract: A thermoplastic molding composition having improved mold release properties is provided, the composition comprising a thermoplastic resin selected from the group consisting of a high molecular weight linear polyester and a high molecular weight block copolyester, from about 0.1 to 4.5% by weight, based on the total composition, of a polyolefin or olefin-based copolymer, and, optionally, from about 0.02 to 0.5% by weight, based on the total composition, of talc.

Abstract: Flame-retarded reinforced thermoplastic compositions are provided comprising a high molecular weight linear polyester resin, a warp resisting amount of a polyphenylene sulfide powder, a flame-retardant and reinforcing fillers. The compositions are moldable to articles having improved resistance to warpage. When the polyphenylene sulfide is employed in the compositions which contain decabromodiphenyl ether as the flame retardant, unexpected improvement in high arc resistance is also observed.