Abstract: Use of a multimodal polypropylene blend in melt processing wherein for enhancing a compromise between melt strength and drawability the blend has a dispersion index of at least 8 and a ratio Mz/Mn of at least 10.

Abstract: Disclosed are compositions for shortstopping free radical emulsion polymerizations and stabilizing polymers produced from the corresponding emulsion processes. Such compositions include at least one hydrophillic radical scavenger (i.e, shortstopper) and at least one hydrophobic radical scavenger. The compositions are preferably targeted for applications in the emulsion processes of rubber latexes. These compositions exhibit excellent performance not only as shortstoppers of free radical emulsion polymerizations but also as stabilizers of the corresponding polymers. Thus, the compositions prevent additional polymerization in the particles without requiring additional stabilizer even after such polymers are steam stripped. They do so without the use of chemicals which carry a high safety, health, or environmental risk.

Abstract: Process for recycling a composition comprising pulverulent calcium fluoride in the form of micrometric particles comprising: (i) a stage of mixing, in the presence of water, the said composition with pulverulent calcium fluoride (also known as natural spar), the particle size of which is suitable for feeding an HF furnace, in a ratio r of less than 75% by weight, preferably of less than 30%, then (ii) a stage of drying the mixture resulting from (i) until a residual water content is obtained which is also suitable for feeding an HF furnace; the stage (ii) optionally being carried out simultaneously with the stage (i).

Abstract: The present invention relates to a multilayer hose for compressed air, comprising:

Abstract: A polypropylene blend including from 0.5 to 50% by weight of a syndiotactic polypropylene having a multimodal molecular weight distribution and at least 50% by weight of an isotactic polypropylene.

Abstract: The invention concerns a method for making acrylonitrile fibers. More particularly, it concerns a method for making acrylonitrile fibers characterized in that it is carried out in the presence of at least an azocarboxylic acid ester.

Abstract: The present invention relates to a multilayer tube comprising, in its radial direction from the outside inwards: a first layer of vulcanized elastomer forming the outer layer, a second layer of EVOH or of an EVOH-based blend, a third layer of a blend of a polyamide (A) and a polyolefin (B) having a polyamide matrix, optionally, an inner layer of vulcanized elastomer, the layers being successive and adhering to one another in their respective contact region. It is also possible to place a tie layer between the first and second layers, and likewise between the optional inner layer and the third layer. The tube of the invention may also include a reinforcing layer of the textile type, for example made of polyester or of metal wires, the said layer being placed between the first and second layers. This reinforcing layer may be between the tie layer and the EVOH layer or between the tie layer and the outer layer or else the tie may be placed in the interstices of the reinforcing layer.

Abstract: The invention relates to a novel process for the anionic polymerization of lactams, in which: (a) (i) a catalyst capable of creating a lactamate and (ii) a regulator chosen from the amides of formula R1—NH—CO—R2, in which R1 can be substituted with a radical R3—CO—NH— or R3—0— and in which R1, R2 and R3 denote an aryl, alkyl or cycloalkyl radical, are dissolved in the molten lactam; the temperature of this reaction mixture being between the melting point of the lactam and 15° C. higher in order to ensure its good stability, (b) the solution from step (a) is introduced into a mixing device and is then heated to a temperature which is sufficient to obtain bulk polymerization of the lactam in no more than 15 minutes. (b) is usually a continuous reactor, for example an extruder; however, it can be replaced with a mold.

Abstract: Preparation of water-blown polyurethane foam using a gaseous co-blowing agent is provided wherein the A-side and B-side are mixed at low pressures.

Abstract: The present invention relates to offshore flexible pipes in which the sealing layers comprise, in this order:

Abstract: The present invention relates to novel novolac resins obtained by coupling at least one aromatic compound (A) comprising at least two hydroxyl groups and at least one aldehyde (B) in the presence of an acid catalyst and in the presence of water and/or an organic solvent, followed by a step of alkylating the coupling resin thus obtained with at least one unconjugated diene (C), preferably containing no indene. These novolac resins are advantageously used in vulcanized and crosslinked elastomeric compositions since their viscosity, which is lower than that of the resins of the prior art, allows them to be handled easily. They are also used as adhesion promoters for improving the adhesion of rubber to reinforcing materials such as organic fibres made in particular of rayon, polyesters, polyamides or aramids, and metal cords made of steel, in particular brass steel or galvanized steel.

Abstract: A polypropylene fibre including at least 80% by weight of a first isotactic polypropylene produced by a metallocene catalyst, and from 5 to 20 by weight of a second isotactic polypropylene produced by a Ziegler-Natta catalyst.

Abstract: A fluoropolymer is described which is a polymer reaction product of a fluoropolymer comprising a polymer reaction product of a) at least one first alkylene co-monomer containing at least one fluorine atom; b) optionally at least one monomer selected from 1) at least one second alkylene containing at least one fluorine atom; 2) at least one alkyl alkenyl ether containing at least one fluorine atom; 3) at least one aliphatic or cyclic ketone containing at least one fluorinated alpha-alpha position; or 4) non-fluorinated alkene, alkyl alkenyl ether, or alkenyl ester; and c) at least one sterically hindered alkenyl or alkenyl ether organo silane co-monomer with or without at least one fluorine substituent. The fluoropolymer can be subsequently cross-linked or further reacted. Methods of making the fluoropolymer are further disclosed as well as applications of the fluoropolymers.

Abstract: The present invention relates to a flexible and tough composition comprising:

Abstract: The invention relates to a process for the preparation of alkylimidazolidone (meth)acrylates, generally expressed as compound (I): that are prepared by reacting at least one (meth)acrylate of formula (II): with a heterocyclic alcohol of formula (III): in the presence of a catalyst comprising at least one compound (a) which is a chelate formed of lithium and of a 1,3-dicarbonyl compound. The invention also relates to a composition comprising compound (I) in solution in (meth)acrylate (II). Finally, the invention involves the use of the abovementioned composition in the preparation of polymers that can be used as coatings and adhesives, in the treatment of paper and of textiles, as agent for leather treatment and in the production of paints with high wet adhesion characteristics.

Abstract: The new metallocene catalysts according to the present invention are prepared by reacting a metallocene compound with a compound having at least two functional groups. The metallocene compound is a transition metal compound which a transition metal is coordinated with a main ligand such as cycloalkanedienyl group and an ancillary ligand. The functional groups of the compound having at least two functional groups are selected from the group consisting of a hydroxy group, a thiol group, a primary amine group, a secondary amine group, etc. The metallocene catalysts according to the present invention have a structure which an ancillary ligand of a metallocene compound is bonded with functional groups. A structure of the metallocene catalysts can be varied according to the metallocene compounds, the compound having at least two functional groups, and the molar ratio of each reactant. The metallocene catalyst is employed with a co-catalyst for styrene and olefin polymerization.

Abstract: The present invention relates to polyetheresteramides (B) containing polyamide blocks comprising dicarboxylic acid sulphonates either as polyamide-block chain limiters or combined with a diamine as one of the constituent monomers of the polyamide block, and containing polyether blocks consisting essentially of alkylene oxide units. The invention also relates to polyetheresteramides (B) containing polyamide blocks of the polyamide oligomer type of low molecular mass or of the copolyamide type which comprise dicarboxylic acid sulphonates and containing polyether blocks which are adducts of alkylene oxide with an aromatic diol. The invention also relates to antistatic or breathable polymer compositions comprising a thermoplastic polymer (A) and at least one of the above polyetheresteramides (B).

Abstract: Polymers are obtained by a radical (co)polymerization of ethylene under high pressure in the presence of at least one initiating free radical (Z*) and of at least one controlling stable free radical (SFR*) which comprises the indoline nitroxide backbone represented by the formula (I). A is a hydrocarbonaceous chain forming an aromatic ring with the two carbon atoms to which it is attached, this ring being able to carry substituents or being able to carry one or more rings placed side by side, which rings are aromatic or aliphatic and optionally substituted, the carbon atoms forming the nitrogenous ring and in the alpha- and beta-position with respect to the nitrogen atom being, able to carry hydrogen atoms or substituents.

Abstract: A process for preparing alkoxyamines in a biphasic medium comprises mixing an ionic liquid, an organic solvent, a metal salt, a ligand for the metal, a halocarbon compound ZX and a nitroxide, keeping the reaction medium stirring at a temperature of between 20° C. and 90° C. until the nitroxide has disappeared, separating the mixture by decantation, recovering the organic phase, and optionally washing it with water and then isolating the alkoxyamine by evaporating the organic solvent under reduced pressure.

Abstract: Polypropylene having improved long chain branching increased melt strength obtained by irradiating polypropylene with an electron beam having an energy of at least 5 MeV and with a radiation dose of from 5 to 100 kGray in the presence of a grafting agent, the branching index of the obtained polypropylene being lower than 0.7.