Abstract: The invention relates to rapidly crystallizing polyester materials and a process for their preparation, in which, in a first stage, the polyester is prepared in the presence of an (alkaline earth) alkali metal or of an (alkaline earth) alkali metal compound, and then, in a second stage, further non-nucleated polyesters and a crystallization accelerator in a adequate amount are, if required, added to this polyester.The polyesters according to the invention are distinguished in particular by reduced molecular weight degradation.

Abstract: A linear or cross-linked polymer selected from polythioethers, polyethers, styrenic polymers, polyacrylates, and polyorganosiloxanes having a plurality of calixarene groups bound thereon, the calixarene groups having the formula ##STR1## where the R.sup.1 groups are the same or different H or hydrocarbyl groups; the R.sup.2 groups are H, hydrocarbyl, --CH.sub.2 C(=O)OR.sup.3, --CH.sub.2 C(=O)R.sup.3, or --C(=O)NHR.sup.3, R.sup.3 is hydrocarbyl or substituted hydrocarbyl; n is an integer of 1-8, m is an integer of 0-7 and n+m is 4-8.

Abstract: Aliphatic polyesters containing sulphur, which contain the sulphur as structural units in the form of sulphide or disulphide groups in both the acid component and the diol component, a process for the preparation of these polyesters, and also polymers containing these polyesters.

Abstract: A polyester, a polyester/polyamide or a polyester/polyamide/polyimide polymers are prepared from (a) a diaryl terephthalate or diaryl isophthalate, and (b) an aromatic polyol or of (a) and a mixture of (b), and an aromatic diamine, or of (a), (b), (c), and (d) a triaryl mellitate, or a copolycarbonate of any of the foregoing including units derived from (e) a diaryl carbonate. The resulting polyester, polyamide, polyester/polyamide or polyester/polyamide/polyimide polymers are adapted for use an an insulating coating on an electrical conductor.

Abstract: The preparation of poly(arylene ether ketones) by Friedel-Crafts polymerization, in the presence of a Lewis acid catalyst and a diluent, is conducted under conditions in which the polymer and/or its complex with the catalyst is suspended in the diluent during at least part of the polyreaction mixture if desired. The dispersant may be a polymer or an organic compound containing at least eight carbon atoms and is preferably a Lewis base. The dispersant preferably contains at least one molecular segment substantially compatible with the poly(arylene ether ketone) or its complex with the Lewis acid and substantially incompatible with the diluent and at least one molecular segment substantially compatible with the diluent and substantially incompatible with the poly(arylene ether ketone) or its complex with the Lewis acid.

Abstract: A process for preparing a cholesteric liquid crystal copolyester consisting essentially of structural units represented by the following formula (A), (B), (C) and (D): ##STR1## which is optically active characterized in that a polyethylene terephthalate oligomer having a (B)/(A) mole ratio in the range of 1.1 to 1.8, p-acetoxybenzoic acid and 3-methyladipic acid are reacted to prepare the final cholesteric liquid crystal copolyester having an inherent viscosity of at least 0.4 dl/g.

Abstract: An unsaturated polyester resin syrup containing styrene monomer in which styrene volatilization is suppressed using a substituted succinic acid or substituted succinic anhydride.

Abstract: A molding composition containing a compatible blend of (i) a polycarbonate having repeating units derived from bis-(3,5-dimethyl-4-hydroxyphenyl)sulfone (TMBS), optionally a dihydric phenol such as 2,2-bis(4-hydroxyphenyl)propane (Bisphenol A) and a carbonate precursor, and (ii) a vinyl chloride derived polymer.

Abstract: Polyphenylene ethers are prepared from monohydric phenols, which possess alkyl substituents in the two ortho-positions and, if desired, in the meta-position, but not in the para-position, by an oxidative coupling reaction with oxygen at from 15.degree. to 50.degree. C. and under from 1 to 10 bar in the presence of a catalyst complex, of a solvent and, if required, of an activator, by a method in which the conversion of the phenols is carried out in two more reaction zones, in which some or all of the solvent, the catalyst complex and the phenols and, where relevant, the activator is initially taken and is circulated by means of a conveying unit, and about 60-100% of the stoichiometric amount of oxygen required for the oxidative coupling is introduced into the first reaction zone and from 0 to about 40% of the said stoichiometric amount is introduced into the second reaction zone.

Abstract: Curing agents which contain carboxy groups, obtained by partial neutralization of an oligoester having an acid number in the range from 245 to 265 with a cyclic amidine, for epoxy-group-containing powder coating compositions to produce matte coatings.

Abstract: Electroactive organic polymeric materials of poly(heterocycle diyl methylenes) containing alternating heterocyclic conjugated segments of varying sizes and methylene or substituted methylenes in the main chain and random copolymers of such poly(heterocycle diyl methylenes) together with a method of making them are disclosed.

Abstract: A five-component copolyester not described in the prior art literature which comprises at least five components, i.e. (a) two aromatic dicarboxylic acid components composed of a major amount of an isophthalic acid component and a minor amount of another dicarboxylic acid component, (b) a diol component composed of an ethylene glycol component and optionally another diol component, (c) an aromatic monohydroxy-monocarboxylic acid component and (d) a polyfunctional compound component having at least three functional groups. The copolyester has excellent melt moldability, mechanical strength, transparency and gas-barrier property in a well balanced combination, and shows improved properties over conventional copolyesters containing a major amount of isophthalic acid as a dicarboxylic acid component.

Abstract: Oxymethylene polymers are prepared by the continuous polymerization of trioxane using as a catalyst a blend of boron trifluoride gas and nitrogen gas. Oxymethylene polymers are used in the manufacture of plumbing fixtures, pipes, automobile body parts and a variety of other articles.

Abstract: Improved polymeric filaments spun at high withdrawal speeds of the order of more than 5 km/min, and preferably of 7-12 km/min, wherein the freshly-extruded filaments enter an enclosed zone that is maintained at superatmospheric pressure by a controlled flow of heated air at a low positive pressure.

Abstract: Copolymers containing oxymethylene and 2-fluoromethoxyethylene repeat units. These copolymers, of improved heat stability, may be prepared by copolymerizing trioxane with a derivative of a cyclic ether whose molecule contains at least two adjacent carbon atoms and in which an oxymethylene group carries a fluoromethyl substituent, especially epifluorohydrin.

Abstract: A process for making polyetherimides involving reacting an aromatic bis(ether anhydride) with an organic diamine in the presence of a solvent so as to form a polyamide acid. The polyamide acid is thereafter polymerized in a solid state at a temperature below the glass transition temperature of the final polyetherimide.

Abstract: A highly reactive aromatic hydrocarbon-formaldehyde resin having a diarlymethane content of not more than 5% by weight, essentially containing reactive groups of any one of CH.sub.2 OH, CH.sub.2 OCH.sub.3 and CH.sub.2 OCH.sub.2 OCH.sub.3 at both molecular terminals and having a xylenol value of at least 15 mol/kg as an index of reactivity with a compound having active hydrogen atoms is prepared by reacting an aromatic hydrocarbon such as xylene, mesitylene or naphthalene with formaldehyde at a molar ratio of the formaldehyde to the aromatic hydrocarbon of 2.0 to 5.0, a sulfuric acid concentration of 15 to 35% by weight in an aqueous layer and a reaction temperature of 80.degree. to 110.degree. C. while controlling a formaldehyde conversion within a range of 50 to 70% by mole over the range 4 to 8 hours.

Abstract: A copolyetherester comprising a random head-to-tail copolymer of 25-55 percent by weight of short-chain ester units; at least 75 mole percent is composed of 1,4-butylene terephthalate units, and long-chain ester units derived from ethylene oxide-capped poly(propylene oxide) glycol having an ethylene oxide content of from 15-35 percent by weight and a number average molecular weight ranging from 1500-2800. The copolyetherester displays improved physical properties, such as a higher elongation at rupture, notched tensile impact energy and tearing energy, if its relative viscosity (1 g of polymer in 100 g m-cresol at 25.degree. C.) is in the range of 2,45 to 5,0 and the melt index MFI is between ##EQU1## It may be prepared by melt condensation of a copolyetherester having a relative viscosity of 1,8 to 2,5 and subsequently subjecting it to post-condensation in the solid phase for a sufficient period to obtain a polymer corresponding to said viscosity and melt index.

Abstract: Spinning of polyethylene terephthalate yarn at speeds in excess of 5000 meters per minute using a gas management technique of the gas surrounding the threadline to control the temperature and attenuation profiles of a spinning threadline provides a means to produce a low crystallinity polyester yarn with a relatively high elongation to break.

Abstract: Process for the preparation of flexible polyurethane foams using polysiloxane-polyoxyalkylene block copolymers as stabilizers having the general formula: ##STR1## in which A represents A.sup.1 and A.sup.2 polyoxyalkylene blocks, as defined hereinafter, which are linked to silicon over carbon and which have the general formula --R.sup.2 --O--(C.sub.x H.sub.2x O--).sub.y R.sup.3, R.sup.2 being a divalent hydrocarbon radical with 2 to 4 carbon atoms and R.sup.3, x and y are as defined hereinafter,B is a methyl radical, the A or R.sup.1 radical,R.sup.1 is an alkyl radical with 1 to 12 carbon atoms, a substituted alkyl radical with 1 to 12 carbon atoms, an aryl or an alkaryl radical,n has a value of 30 to 200,m has a value of 3 to 20 when B is a methyl radical or corresponds to the R.sup.1 radical, and a value of 1 to 18 when B corresponds to the A radical,o has a value of 0 to 40, n being not less than 5 m, and m and o being not greater than 1/3 n,with the proviso that(a) the A.sup.