Abstract: Moldable polyester resins having high melt-phase stability and which form substantially no thermal decomposition products during melt-phase processing have a carboxyl end group concentration of no greater than 40 milliequivalent/kg, and are the reaction product of (a) an aromatic dicarboxylic acid or its ester-forming derivative, (b) an aliphatic dihydroxy compound having 2 to 8 carbon atoms, and (c) an ester-forming comonomer having the general formula (I):HO--R--O--A--O--R--OH (I)wherein A represents a divalent organic radical having at least one aromatic ring, R represents a divalent organic radical selected from the group consisting of aliphatic hydrocarbon groups and polyoxyalkylene groups each having 2 to 8 carbon atoms. The ester-forming comonomer is incorporated into the polyester resin chain in an amount between 0.01 to 7 molar %, based on the aromatic dicarboxylic acid.

Abstract: An improved polyester exhibiting melt anisotropy and excellent thermal stability is provided which consists essentially of the structural units (I) to (III) wherein: ##STR1## wherein Ar.sub.1 is 1,4-phenylene, Ar.sub.2 is a mixed system of 2,6-naphthalene and 2,7-naphthalene, and Ar.sub.3 is an aromatic ring containing 6 or more carbon atoms, the unit (I) accounting for 15 to 90 mole percent and the unit (II) for 20 to 70 mole percent of the total amount of the structural units, and the percentage of 2,7-naphthalene to the total amount of Ar.sub.2 in the unit (II) being between 10 and 90 mole percent.

Abstract: Polyester film has a thickness of between 10 to 500 .mu.m and exhibits excellent tear strength retention against thermal history conditions. The film is prepared from a resin composition which includes 100 parts by weight of a polyester consisting essentially of alkylene terephthalate groups as the main recurring units in the polymer chain and between 0.1 to 5 parts by weight of a bisoxazoline compound incorporated thereinto. The film is usefully employed as a sterilizing bag or as a food-packaging material and can be laminated to anther sheet of film or to paper.

Abstract: A resin composition, being useful for coating on electric wire, comprises an aromatic polyester, a halogenated compound such as diol, diglycidyl and dicarboxylic acid and a di-heterocyclic compound.

Abstract: A process for producing a transparent film includes forming a melt from a copolyester having structural units represented by the following formulas I and II, respectively: ##STR1## wherein R groups may be the same or different from each other are each selected from the group consisting of--CH.sub.2 CH.sub.2, --CH.sub.2 CH.sub.2 OCH.sub.2 CH.sub.2 --, --CH--CH.sub.2 --, ##STR2## and the molar fraction ratio of the structural units of formula II to the total structural units of formulas I and II is between 0.02 to 0.020, which a melt of the copolyester is formed into a film, rapidly quenched to solidify the copolyester and impart low crystallinity thereto. The solidified film is aged at a temperature of 60 degree centigrade or below, and then heat-treated at a temperature between the glass transition point (Tg) of the copolyester and no greater than 2.degree. C. below the melting point of the copolyester minus 2.

Abstract: A copolyester resin is the polycondensation reaction product of (a) terephthalic acid or a dialkyl terephthalate, (b) at least one alkylene glycol having 2 to 8 carbon atoms, and (c) a dimer diol having as a main component a compound of the following formula (1): ##STR1## wherein R.sub.1 through R.sub.4 are each unsaturated linear organic groups such that the total number of carbon atoms of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is between 22 to 34. Preferably, R.sub.1 and R.sub.2, which may be the same or different, each represent an alkyl group, and R.sub.3 and R.sub.4, which may be the same or different, each represent an alkylene group. The resin of the present invention may be melt-blended with a filler material and formed into a film by suitable film-forming techniques. The film is especially advantageous due to its heat-sealing and mechanical properties.

Abstract: A halogen-containing polyester resin composition comprises a flame retardant aromatic polyester copolymer having a halogen content of 0.5-30% by weight which is produced by condensation polymerization reaction of:(A) principally an aromatic dicarboxylic acid or an ester-forming derivative thereof,(B) principally an aliphatic glycol or an ester-forming derivative thereof, and(C) an ester-forming compound containing a halogen,and, in mixture therewith, 0.1-10% by weight of a bisoxazoline compound relative to the total weight of the composition.

Abstract: A novel polyester is provided which forms an anisotropic melt phase in combination with good heat resistance and melt-processability. The polyester is formed from a combination of appropriate concentrations of four essential constituent units (as described). In a particularly preferred embodiment the polyester is derived from p-acetoxybenzoic acid, 4,4'-diacetoxydiphenyl, 2,2-propylidenebis(1,4-phenylene), and terephthalic acid. The resulting polyester is well suited to injection molding to form superior three-dimensional articles, fibers and films.

Abstract: A polymer such as polyester is modified with reaction with a modifier of a compound having the formula: ##STR1## in which X is halogen, Y.sub.1 and Y.sub.2 are a three- to eight-membered ring, Z is a divalent organic group and n is 1 or more.

Abstract: A resin composition comprises a thermoplastic polymer and a smectic liquid crystal compound and is useful for fibers and film having been improved in mechanical properties.

Abstract: A wholly aromatic polyester is composed of naphthalene dicarboxylic acid units comprising 5 to 95 mole % of the unit having the formula (1) and 95 to 5 mole % of the unit having the formula (2) and aromatic diol units having the formula (3). It is improved in heat resistance and may be blended with a filler.

Abstract: A halogen-containing polyester resin composition having an improved stable flexibility and flame retardency which comprises a bislactam compound and a flame-resisting aromatic polyester copolymers containing halogen at a ratio of 0.5 to 30% by weight, said copolymers being by the poly-condensation of(A) aromatic dicarboxylic acids or ester-forming derivatives thereof;(B) aliphatic glycols or ester-forming derivatives thereof; and(C) halogen-containing ester-forming compounds, said bislactam compound being present in a ratio of 0.1 to 10% by weight based on the total quantity of the composite.

Abstract: Polyalkylene arylate resin compositions include a crystalline polyalkylene arylate base resin and a copolyester comprised of a polyalkylene arylate segment which exhibits smectic liquid crystallinity, and a polyalkylene arylate segment which does not exhibit smectic liquid crystallinity. Improved crystallization rates, and thus faster mold cycle times (i.e. increased productivity), ensue from the compositions of this invention.

Abstract: A polyester resin composition exhibiting improved heat-resistant flexibility including (A) a polyester copolymer which is the polycondensation reaction product of (a) an aromatic dicarboxylic acid or an ester-forming derivative thereof, (b) an aliphatic glycol, and (c) between 0.001 to 1.0 mole %, based upon component (a), of a branch-forming compound, and (B) between 0.1 to 10% by weight (based on the total weight of the composition) of a bisoxazoline compound.

Abstract: An electric wire comprising a conductive wire in which the surface thereof is covered with a covering material having improved long-term thermal stability and comprising a polymer comprised of an aromatic polyester as a main skeleton and a compound represented by the following general formula (A) incorporated therein in an amount of 0.1 to 20 parts by weight based on 100 parts by weight of said polymer: ##STR1## wherein X is a halogen, Y.sub.1 and Y.sub.2 which may be the same or different are each a functional group containing an epoxy group, Z is a divalent organic group and n is an integer of 1 or more.

Abstract: The present invention provides a novel flame-retardant halogenated copolyester containing a branched or crosslinked structure to an extent such that it will not impair the solubility of the copolyester in solvent to thereby reduce the lowering in the softness caused by thermal history. Therefore, this copolyester and a composition comprising the same are particularly useful as a coating material for an electric wire to be used in the vicinity of a heat source or in an environment in danger of heat buildup.

Abstract: A flame-retarding polyester composition is useful for coating an electric wire, which comprises a melt-mixture of, (A) a copolyester having a halogen content of 0.5 to 30 wt. % and (B) a branched copolymer prepared by the condensation polymerization of monomers mainly comprising(a)' a component mainly comprising an aromatic dicarboxylic acid or an ester-forming derivative thereof,(b)' a component mainly comprising an aliphatic glycol or an ester-forming derivative thereof and(d) a branching compound, which contains 0.001 to 0.5 molar % (based on the total amount of the carbonyl groups of the copolyester) of said branching compound (d).

Abstract: A liquid-crystalline polymer which comprises a new copolymer comprised on one constituent for the main chain thereof containing two or more different naphthalene groups and a different constituent, said polymer being capable of forming the anisotropic phase in the molten state and is improved in the mechanical strength.

Abstract: The present invention provides a novel flame-retardant halogenated copolyester containing a branched or crosslinked structure to an extent such that it will not impair the solubility of the copolyester in solvent to thereby reduce the lowering in the softness caused by thermal history. Therefore, this copolyester and a composition comprising the same are particularly useful as a coating material for an electric wire to be used in the vicinity of a heat source or in an environment in danger of heat buildup.

Abstract: A synthetic resin composition, having a high toughness and a wear resistance, comprises a synthetic resin with solubility parameter .delta.9.5 cal1/2 cm.sup.31 3/2 or higher and a modifier with solubility parameter .delta.8.5 cal.sup.1/2 cm.sup.-3/2 or lower and dispersed therein, characterized in that a silicon containing copolyester, being a block copolymer consisting of 1.about.90% by weight of siloxane segment represented by the undermentioned general formula (A) and 99.about.1% by weight of polyester segment represented by the undermentioned general formula (B), the degree of polymerization of siloxane segment being 1.about.2,000, and that of polyester segment 1.about.1,000, is added to be mixed therewith as a dispersibility improver: ##STR1## (In this formula, m denotes a number of 1.about.2,000.) ##STR2## (In this formula, R.sub.1 designates one or two or more members selected from among aromatic divalent radicals having 6.about.12 carbon atoms or aliphatic divalent radicals having 4.about.