Abstract: A process for the sterilization of objects made of polymers in which the molecule contains a halogen, or of products packaged in such polymer material, the polymer containing a heat stabilizer wherein, prior to irradiation of the object or the package and its contents, there is incorporated into the polymer one or more esters carrying at least one mercaptan function in the proportion of one --SH group for 3 to 10 carbon atoms.

Abstract: The invention relates to a fire-resistant synthetic resin composition containing a polycarbonate, more specifically a bisphenol A derivative, a phosphorous fireproofing additive derived from phosphonic acid, and possibly other additives and/or fillers.The fireproofing additive is a Li, Na or K hemiester of a phosphonic acid derived from an aromatic or cycloaliphatic hydrocarbon, or from a polynuclear aromatic compound, and is added at the rate of 0.01 to 0.4 weight % in relation to polycarbonate. This small amount of additive improves the fire-resistant properties of the polycarbonate, without affecting its mechanical properties.

Abstract: The invention relates to a process for polymerizing in an aqueous phase using heterogeneous catalysis and to a spherical reactor for carrying out said process. At least one monomer which is gaseous under the reaction conditions is just in contact with a solid catalyst in an agitated polymerization zone. The polymerization zone is defined by a spherical wall and the agitation is effected by means of a turbine unit having blades driven in rotation. The blades extend alongside the wall on 10 to 60% of its surface. The particles of the catalyst and the growing polymer powder are driven by centrifugal force onto at least a part of the spherical wall and fall back into the central part of the spherical zone, thereby ensuring a thorough and uniform mixing without any dead zone. The invention is useful for prepolymerizing or polymerizing olefins.

Abstract: The invention relates to a fire-resistant synthetic resin composition containing a polycarbonate, more specifically a bisphenol A derivative, a phosphorous fireproofing additive derived from phosphonic acid, and possibly other additives and/or fillers.The fireproofing additive is a Li, Na or K hemiester of a phosphonic acid derived from an aromatic or cycloaliphatic hydrocarbon, or from a polynuclear aromatic compound, and is added at the rate of 0.01 to 0.4 weight % in relation to polycarbonate. This small amount of additive improves the fire-resistant properties of the polycarbonate, without affecting its mechanical properties.

Abstract: The invention provides for a coating composition for metal surfaces wherein the binder is made up of (A) 10-80% by weight of a solid, powdered polyamide having a softening point of 110.degree.-230.degree. C. and an average particle size of 0.5-200 .mu. m, (B) 20-90% by weight of a hydroxyl groups-containing polymer having a number average molecular weight of 800-20,000 and a hydroxyl functionality of 1.5-6, and the composition also contains a cross-linking agent for component B in an amount such that the molar ratio of the reactive groups of the cross-linking agent to that of component B is 0.6-1.5, and 40-60% by weight of an organic solvent for component B, the boiling point thereof being 140.degree.-310.degree. C. The invention also relates to a process for coating a metal surface using said coating composition.

Abstract: The process concerns stabilization of polymers against ionizing radiation where the polymer molecule contains a halogen. It comprises incorporating hydroquinone into the polymer, especially into polyvinyl chloride, the polymer containing both a metallic compound, heat stabilizer, and also a mercaptan.

Abstract: The present invention relates to a new thermofusible adhesive based on certain block copolyetheramides resulting from the copolycondensation of polyamide blocks with reactive extremities with polyether blocks with reactive extremities.

Abstract: The invention relates to a method of preparing polyether-ester-amide block copolymers having recurrent units of the general formula: ##STR1## wherein A is a polyamide sequence and B a linear or branched polyoxyalkylene glycol sequence, the alkylene radical of which comprises at least two carbon atoms, and wherein n indicates that there is a great number of recurrent units. The plastic materials prepared by the novel method have mechanical properties which allow them to be used in technological transformation operations for the manufacture or moulded or extruded articles such as films, sheaths, fibres for textiles products, etc.. They may also be used for making bonded or welded linings.

Abstract: A moldable and/or extrudable polyether-ester-amide block copolymer is disclosed which has the formula ##STR1## wherein A is a linear saturated aliphatic polyamide sequence formed from a lactam or amino acid having a hydrocarbon chain containing 4 to 14 carbon atoms or from an aliphatic C.sub.6 -C.sub.12 dicarboxylic acid and a C.sub.6 -C.sub.9 diamine, in the presence of a chain-limiting aliphatic carboxylic diacid having 4 to 20 carbon atoms; said polyamide having an average molecular weight between 300 and 15,000; and B is a polyoxyalkylene sequence formed from linear or branched aliphatic polyoxyalkylene glycols, mixtures thereof or copolyethers derived therefrom said polyoxyalkylene glycols having a molecular weight of between 200-6,000 and n indicates a sufficient number of repeating units so that said polyether-ester-amide block copolymer has an intrinsic viscosity of from about 0.8 to about 2.05.

Abstract: A process for manufacturing thermoplastic materials having an elevated gas impermeability and/or improved physical properties. This process is characterized in that it comprises mixing at least partially imcompatible polymers, gelling them by the combined action of heat, pressure and kneading. The gelled mixture is then subjected to laminar flow through substantially parallel surfaces in which the ratio of the length of the surfaces to the distance between them is greater than 10.A thermoplastic material having increased gas impermeability as well as containers made out of said materials.A packaging method in which the thermoplastic materials of the invention are used to package oxygen sensitive materials.

Abstract: New fire-resistant transparent (co)polycarbonates containing alkaline diesters or hemiesters of bis (hydroxy-4-phenyl) alkylphosphonic acids, with the following general formulae (I) or (II): ##STR1## (I) where n=1, 2 or 3 (II) where n=0, 1, 2 or 3 andwhere R.sub.1 or R.sub.2 is a methyl or ethyl radical, and M is an alkaline metal, such as sodium or potassium.

Abstract: A process for making crystalline polymers or copolymers of alpha-olefins containing 3 to 8 carbon atoms, such as polypropylene, by polymerization with a catalyst consisting of a combination of titanium chloride and an organic aluminium compound, in the presence of a stereospecificity additive.This stereospecificity additive is a cyclic polyether of the crown ether type, which may contain sulphur atoms and/or nitro radicals; this additive may be used together with an activator.The process produces polymers or copolymers with a high isotacticity index, while keeping catalyst activity sufficiently high.

Abstract: Novel alkaline hemiesters of bis-(hydroxy-4-phenyl)-alkylphosphonic acids of the general formula: ##STR1## in which: n is equal to 0, 1, 2 or 3,M is an alkaline metal such as lithium, sodium or potassiumR.sub.1 is a cyclohexyl radical or an C.sub.1 to C.sub.6 alkyl radical.

Abstract: Isotactic and atactic polypropylene of acceptable purity are obtained by contacting the polymerized polymer with a mixture of hydrocarbon, alcohol, organic acid and diketone.

Abstract: Process for preparing ether-ester-amide block polymers. It consists in the reaction, in the molten state of a dicarboxylic polyamide having COOH end groups with a polyoxyalkylene glycol having hydroxyl end groups in the presence of metallic tetraalkoxide(s) as catalysts. The tetraalkoxide(s) used are of the formula M(OR).sub.4 where M is Zr or Hf and the radicals R, identical or different are linear or branched C.sub.1 -C.sub.24 alkyl radicals.

Abstract: A process for manufacturing thermoplastic materials having an elevated gas impermeability and/or improved physical properties. This process is characterized in that it comprises mixing at least partially incompatible polymers, gelling them by the combined action of heat, pressure and kneading. The gelled mixture is then subjected to laminar flow through substantially parallel surfaces in which the ratio of the length of the surfaces to the distance between them is greater than 10.A thermoplastic material having increased gas impermeability as well as containers made out of said materials.A packaging method in which the thermoplastic materials of the invention are used to package oxygen sensitive materials.

Abstract: Hydrolysis-resistant copolyether-esteramides according to this invention are terminated, at one chain end, by a hydrocarbon radical and at the other chain end by a hydroxyl group. The sequential linear aliphatic copolyether-esteramides according to the invention are obtained by a polycondensation reaction of linear aliphatic dicarboxylic polyamide oligomers having a molecular weight comprised between 300 and 15,000, with .omega.-.omega.'-dihydroxyl polyoxyalkylene sequences having a molecular weight comprised between 100 and 6000 in the presence of a linear aliphatic monocarboxylic polyamide oligomer having a carboxyl group at one end of the macromolecular chain and a hydrocarbon radical at the other end thereof.

Abstract: Thermoplastic polymer cover for golf balls.The thermoplastic polymer material constituting the cover consists of a poly(ether-ester-amide) sequenced copolycondensate having special characteristics.Such a cover has good mechanical characteristics and confers on the golf balls so covered a satisfactory "feel" and "click".

Abstract: A thermoplastic multi-layer foil structure comprises a styrenic polymer layer and an olefinic polymer layer bonded by an intermediary polymer layer comprising at least one layer constituted by a bonding agent. In this multi-layer structure, at least one layer containing scrap produced from said multi-layer foil structure is included in the latter, said scrap-containing layer including a mixture of said scrap with a convenient proportion of a graft copolymer of a styrenic monomer on a polyolefinic substrate.

Abstract: A process for the separation of sulphonated paraffins from their sulphonation medium, which comprises neutralization of the sulphuric acid present and separation into two phases, the lower phase containing the sulphate. The neutralization is carried out in such a way that only a part of the sulphuric acid is neutralized. A hydrocarbon is added, which dissolves the sulphonated and non-sulphonated paraffins and forms with water, an azeotropic mixture which is distilled in order to remove all or a part of the water present. The process allows the separation of sulphonates which are purer than in the past and which are poor in sulphates, while the sulphate layer contains only very little sulphonic acid.