Abstract: Novel polyester for the packaging of perishable comestibles, e.g., as bottles for still or carbonated mineral waters, is a poly(ethylene glycol)terephthalate (PET) having an intrinsic viscosity ranging from 0.65 to 1.05 dl/g and a density of more than 1.38, comprising 92.5 to 98.5% of ethylene terephthalate recurring units and 1.5 to 7.5 mol % of recurring units of at least one polybasic acid and/or polyhydric alcohol comonomeric crystallization retardant, the di- and/or triethylene glycol content thereof being less than about 3.5 mol % per mol of diacid radicals present in the polymer chain, said PET also having a residual acetaldehyde concentration of less than 1.25 ppm, with acetaldehyde being reformed therefrom at a rate of less than 5 ppm/hour, at 220.degree. C., and said PET being devoid of visible crystallization in an at least 4 mm thick test plate shaped in a mold cavity from a melt thereof.

Abstract: The invention relates to a two-constituent textile filament.It consists of a polyhexamethyleneadipamide and a copolyamide containing amide groups, which is produced from caprolactam and from at least one difunctional amide-forming reactant having a saturated long chain.It can be used in the textile field and particularly in the knitted garment trade.

Abstract: Flame-resistant copolyesters are disclosed consisting or consisting essentially of from 85 to 99.5% of repeating units of the formula --CO--R--CO--O--R.sub.1 --O-- in which R is a divalent aromatic radical and R.sub.1 is a divalent aliphatic, cycloalkane radical or a mixture of two or several of these radicals; and least 0.5% of units of the formula: ##STR1## in which Me represents a metal such as Na, K, Ca or Zn, and Z represents a paraphenylene group or a divalent aliphatic grouping which contains from 1 to 18 carbon atoms, and may comprise heteroatoms, and is optionally branched, the branch being an aliphatic radical which may be halogenated, and comprises from 1 to 6 carbon atoms; and from 0 to 14.5% of units produced from a brominated compound of the formula: ##STR2## in which R.sub.5 is zero or represents a grouping: ##STR3## and A and A' represent either --CO--OX groups, where X=H or a lower alkyl group, or --X'OH groups, where X'=a--OCH.sub.2 --CH.sub.2 --.sub.n group, and n=1 to 10.

Abstract: New method of manufacturing polyesters and copolyesters having a base of aromatic diacids and condensation diols having at least 3 carbon atoms.This method, carried out in the presence of an organic titanium derivative, by transesterification between an alkyl ester of the aromatic diacid and the diol, and then polycondensation, is characterized by the addition, during the polycondensation stage, of 0.001 to 1% by weight of a nonvolatile amine, based on the weight of polymer.The polymers obtained may be transformed into threads, fibers, films or molded objects.

Abstract: Compositions of polyesters having improved affinity for acid dyes are produced by incorporating in the compositions of polyester-forming dicarboxylic acid and dihydric alcohols quaternary ammonium compounds of the formula ##STR1## WHEREIN THE R's represent aliphatic, cycloaliphatic or aromatic radicals, said R's being free of ester-forming substituents, at least two R's being capable of forming together a ring containing or not other quaternizable nitrogen atoms; and where:X.sup.n.sup.- is a stable anion of valency n of an organic acid, of a mineral oxyacid, or an halide; and where:y is an integer equal to the valence of the anion.

Abstract: Articles made from polyesteramines such as filaments, fibers and molded products are dyed by treating the article with an alkylating agent in the form of a solution or emulsion in an amount of at least 1.5% by weight based on the weight of the article and at a temperature higher than room temperature for at least 15 minutes. The article is then dyed with a conventional anionic dye and preferably these two steps are carried out simultaneously.

Abstract: Polyesteramines with good dye affinity for anionic dyestuffs formed by reactingA. at least an aromatic dicarboxylic acid and possibly a small amount of an aliphatic diacid,B. at least a diol having at least 3 carbon atoms such as an aliphatic, a saturated alicyclic or a cycloaliphatic diol, andC. at least a compound of the formulaNR.sub.3where R, being the same or different, is alkyl, saturated alicyclic, cycloalkyl or arylaliphatic, or where two R groups form a cycle between them.The NR.sub.3 compound has 1, 2 or 3 R groups containing 0, 1, 2 or 3 ester generating groups with the total number of ester generating groups being 1 to 3. The NR.sub.3 compound has no more than two R groups being arylaliphatic or cycloaliphatic which have only one carbon atom between the cycle and the nitrogen atom or being saturated alicyclic and there are at least 3 or more carbon atoms between the ester generating groups and the nitrogen atom.The total amount of the NR.sub.

Abstract: Polyesters having improved affinity for acid dyes are produced by incorporation, in the polyester-forming dicarboxylic acid and dihydric alcohols, quaternary ammonium compounds of the formula ##EQU1## wherein the R's represent aliphatic, cycloaliphatic or aromatic radicals, at least one R being substituted by at least a group capable of forming ester bonds with the recurring polyester units, at least two R's being capable of forming between them a ring which may contain quaternizable nitrogen atoms; and where:X.sup.n.sup.- is a stable anion of valency n of an organic acid or of a mineral oxyacid; and where:y is an integer equal to the valence of the anion.The resulting composition is melt spinnable.