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 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 aluminum 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: 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 aluminum compound, in the presence of a stereospecificity additive.This stereospecificity additive has the formula:R.sub.1 --O--(C.sub.p H.sub.2p)--S--R.sub.2,where:R.sub.1 and R.sub.2 are alkyl radicals containing 1 to 4 carbon atoms or are linked together to form a divalent --(C.sub.m H.sub.2m)--radical, andp and m are integers each with a value of 1 to 6;this additive may be used in the presence of an activator.

Abstract: The invention relates to a process for the preparation of lactames according to the so-called "Beckmann rearrangement" which consists in isomerizing oximes in a sulfuric solution, the weight ratio percentage of sulfuric acid to the combined amount of sulfuric acid and water being raised to a value above that of the sulfuric solution feed.

Abstract: A process to synthesize poly (ether-ester-amide) sequence copolycondensates by the reaction in a molten condition between a dicarboxylic polyamide, in which the carboxylic functions are located at the chain-ends, and a polyoxyalkoylene with hydroxylated chain-ends, in the presence of a catalyst.This reaction is performed continuously in a thin-film reaction space through which the reaction mixture passes continuously under turbulent flow conditions.This process, which involves much shorter reaction times, produces sequence copolycondensates with better mechanical properties than corresponding substances obtained by batch processes.

Abstract: A process for measuring the adhesive power of pressure-sensitive adhesives, especially adhesive tapes or sheets; it is also related to a device for implementing this process. This process consists in causing a ball to fall freely onto the adhesive surface of the tape or sheet and exerting a vertical upwardly directed separating force upon the ball, the measurement of the adhesive power of the adhesive being a function of the time comprised between the instant when the separating force is initially exerted upon the ball and the instant when the ball returns to its initial starting point.

Abstract: Copolyetheresteramide based compositions which are stable with respect to the effects of heat, light and oxygen are disclosed. From about 0.05 to about 5% of 4-4'-bis-(.alpha.-.alpha.'-dimethylbenzyl)-diphenylamide either alone or in combination with 0.01 to 2% of cuprous iodide and potassium iodide such that the ratio of CuI to KI is between 0.1 and 1.9 is added to the copolyetheresteramide to form a stable composition.

Abstract: A process for separating sulphonic acids from a paraffin sulphonic acid solution containing in addition to the paraffin sulphonic acids, sulphonic acid, water and optionally non-sulphonated paraffins by mixing the solution with a slightly polar solvent having solubility in water of less than 7 percent to form an aqueous phase and an organic phase, separating the phases, neutralizing the organic phase and recovering the paraffin sulphonic acids from the neutralized organic phase.

Abstract: A process for manufacturing petroleum resins for adhesive thermofusible compositions, having a softening point comprised between 60.degree. and 110.degree. C., a molecular weight comprised between 700 and 1,500 and a Gardner color index less than 9, consisting in polymerizing a C.sub.5 hydrocarbon distillation cut issuing from a steam cracking of naphtha or gas-oil and containing less than 5% isoprene and less than 1% cyclopentadiene, in the presence of a Friedel-Crafts catalyst.

Abstract: The invention provides artificial straw adapted to be used instead of natural straw for stable litter or the like. This artificial straw is constituted of chips made of a crystalline thermoplastic alimentary polymer having an elongation at rupture of at least 50%, said chips having, when in a flat and stretched condition, a shape and dimensions such that each chip is inscribable in a parallelepiped having a length comprised between 30 and 800 mm, a width comprised between 1 and 20 mm and a height comprised between 0.06 and 12 mm, the thickness of said chips being comprised between 0.06 and 0.8 mm.

Abstract: The present invention relates to a process for improving the water wettability of polyolefins, especially under the form of fibers, fibrils or powders.The thus treated polyolefins have an improved wettability, which in the treatment conducted in aqueous suspension facilitates their dispersion in water. This is among others the case in the production of at least partially synthetic papers.

Abstract: The invention concerns a low-density polyethylene-based polymer composition for producing films or sheaths. The present invention provides a low-density polyethylene-based polymer composition for manufacturing films or sheaths, particularly thin films or sheaths having a thickness of less than twenty microns, said polymer composition being constituted by a graft copolymer comprising at least one styrene monomer, possibly mixed with at least one acrylic monomer, said monomer or monomers being grafted onto a trunk constituted by a pre-formed combination or alloy containing by weight, 50 to 95% low-density polyethylene and 50 to 5% high density polyethylene and/or polypropylene, the proportion of the grafted styrene monomer or mixture of monomers being comprised between 5 and 50% by weight of said graft copolymer.

Abstract: A process for synthesizing sequence copolyesteramides with the general formulaOH [CO--A--COO--B--O].sub.n Hwhere A is a linear aliphatic polyamide sequence and B is a linear aliphatic copolyesteramide sequence, for use in producing moulded or extruded articles with good mechanical resistance at elevated temperature; the process consists of polycondensation of a linear aliphatic copolyesteramide with hydroxyl end-groups, with a molecular weight of between 1,000 and 10,000, and a polyamide with carboxyl end-groups, with a molecular weight of between 2,000 and 15,000.

Abstract: A process for chemical modification of polyolefins, particularly fibrillar, powder, granular or film polyolefins, in which one or more polar monomers are grafted to the polyolefins in an aqueous dispersion, by means of a free-radical generator.Grafting is done in the presence of a wetting agent and a particular additive derived from alkanes and possessing at least 1 thiol function; the dispersion contains 0.1 to 50 parts weight of monomer, 0.1 to 3 parts weight of wetting agent, and 0.1 to 3 parts weight of additive, for 100 parts weight of polyolefin.Polyolefins that have undergone this process have an improved wettability and, in applications requiring treatment in an aqueous suspension, such as the production of partly synthetic paper, this facilitates their dispersion in water.

Abstract: Anionic polymerization of lactams is carried out in an extruder into which at least one lactam, at least one catalyst and at least one activating agent are introduced and wherein the mixture of said substances is polymerized prior to being extruded through an extrusion die. The output rate of the polymerized substance is controlled by transfer means, such as a metering pump, arranged between the outlet of the body of the extruder and the extrusion die.

Abstract: An installation for coating substantially U-shaped or V-shaped articles, such as hairpins, curlers and similar items includes treatment stations comprising a coating station at which a powderous plastic material is applied onto those portions of the objects which are to be coated, a heating station at which the said portions of the objects are heated to a temperature at which said powderous plastic material melts, and conveying means for conveying said objects to said stations. The installation according to the instant invention comprises at its inlet end inlet means for introducing in bulk the objects to be coated into said installation, pick-up means for separately picking up said objects one by one, and orienting and feeding means for feeding said objects to said coating stations, at least a part of said orienting and feeding means being adapted to mask the remaining portions of said objects, which are not to be coated.

Abstract: Small workpieces to be coated with plastic material are preheated and dropped onto a fluidized bed of plastic powder subjected to compound vibratory motion which causes the powder and the workpieces to move along a helical ramp onto a screen overlying the point of entry, with some of the particles fusing onto the workpiece surfaces to form a film. The remainder of the powder, on reaching the screen, drops back onto the bed as the coated workpieces move on to a receptacle. Fresh workpieces are deposited on the bed through one or more chutes traversing the screen; to prevent the rise of any particles through the chutes, a downward airflow is created therein.

Abstract: The instant invention relates to a method for preparing paraffin-sulphonic acids by photochemical sulphoxidation of paraffinic hydrocarbons. The invention also relates to a device for carrying out this method.The invention relates more particlarly to a method for continuously preparing paraffin-sulphonic acids by photochemical sulphoxidation of paraffinic hydrocarbons comprising the steps of reacting a gaseous mixture of sulphurous acid anhydride and oxygen with a liquid paraffiaic phase and injecting at least a portion of said gaseous mixture into said liquid phase in the form of a finely divided dispersion in a recycling fraction of said paraffinic phase which carries said gaseous mixture.

Abstract: This invention concerns a process for obtaining homogeneous polymer compositions containing at least one olefin polymer and/or one arylvinyl polymer.The process consists of adding, to either or to a mixture of both of these polymers, one or more block copolymers, containing one polyolefin and one polyarylvinyl sequence.These polymer compositions provide homogeneous substances with properties combining those of the individual polymers, and in some mixtures these properties are considerably improved as the result of synergic phenomena.

Abstract: A process for preparing pure N-alkyl-lactams obtained by the reaction, in an organic solvent medium of, the corresponding lactamate of an alkali metal and an alkyl halide. This process consists of treating a reactive mixture of N-alkyl-lactam containing the corresponding cyclo-alkylene imine as an impurity with a current of carbon dioxide, until the cyclo-alkylene imine precipitates completely in the form of an insoluble carbonate, and then separating it from the precipitate.