Abstract: The present invention provides a polyester resin composition for injection-molding which is excellent in mold releasability, and is capable of providing light reflectors which are excellent in apparent luminance and reflectivity, and suppressed in hazing even used under high temperatures. A polyester resin composition for injection-molding comprising, (A) 100 parts by weight of a polyester resin, (B) 0.1 to 20 parts by weight of zirconium silicate having an average primary particle size of 10 ?m or smaller and (C) 0 to 5 parts by weight of a chelating agent capable of forming a chelate with mono- to tetra-valent metal ions.

Abstract: A thermoplastic resin composition comprising: a transparent aromatic thermoplastic resin (a) and a copolyester resin (b) comprising at least two kinds of dicarboxylic acid moieties and one kind of diol moiety, 1 to 50 mol % of the dicarboxylic acid moieties being a naphthalenedicarboxylic acid moiety, the ratio of (a) to the combined amount of (a) and (b) being 55 to 99.99% by weight, and the ratio of (b) being 0.01 to 45% by weight.

Abstract: The present invention relates to a multi-layer packaging film comprising an intermediate layer having at least one outer layer on both surfaces of the intermediate layer, and having the thickness of not more than 40 &mgr;m, said outer layer comprising a polyolefin resin, said intermediate layer comprising a polytetramethylene terephthalate resin obtained by copolymerizing polytetramethylene oxide glycol having a number-average molecular weight of 300 to 5,000 and having an intrinsic viscosity of 0.7 to 2.0, a melting point of 200 to 228° C. and a crystallization temperature of not higher than 180° C., and the thickness of said intermediate layer being 20 to 80% of the thickness of the multi-layer film.

Abstract: A thermoplastic resin composition comprising:

Abstract: The present invention relates to a thermoplastic resin composition comprising:

Abstract: A method for producing a liquid crystalline polyester, which comprises reacting compounds of the following formulas: ##STR1## and a dicarboxylic acid of the following formula ##STR2## wherein R.sup.1 is a bivalent aromatic hydrocarbon group having from 6 to 18 C atoms as starting material, for polycondensation in a molten state.

Abstract: A liquid crystalline polyester comprising dicarboxylic acid units of the following formula (1): ##STR1## wherein R.sup.1 is a bivalent aromatic hydrocarbon group having from 6 to 18 carbon atoms, diol units of the following formula (2):--OCH.sub.2 CH.sub.

Abstract: A process for producing a copolymeric polyester, which comprises a first step of preparing a copolymeric oligomer by reacting a starting material oligoester or polyester having repeating units of the formula: ##STR1## wherein R.sub.1 is a divalent aromatic hydrocarbon group having from 6 to 10 carbon atoms, a divalent alicyclic hydrocarbon group having from 4 to 20 carbon atoms or/and a divalent aliphatic hydrocarbon group having from 1 to 40 carbon atoms (provided a hydrogen atom in the aromatic ring of the aromatic hydrocarbon group may be substituted by a halogen atom or an alkyl or alkoxy group having from 1 to 4 carbon atoms), and R.sup.

Abstract: A process for producing a melting-anisotropic copolymerized polyester containing an alkylene terephthalate component, which comprises reacting a starting polyester composed of a dicarboxylic acid and a diol with an oxyaromatic carboxylic acid to form a copolymerized oligomer, then conducting acylating reaction by the addition of an acylating agent and further conducting polycondensating reduction thereby producing a melting-anisotropic, copolymerized polyester having a logarithmic viscosity of at least 0.2 dl/g. According to this process, a polyester of excellent physical property can be obtained at a good production efficiency.