Abstract: The present invention relates to the method for obtaining vinylidene fluoride and the subject matter thereof is more particularly the production of vinylidene fluoride by pyrolysis of 1,2-dichloro-2,2-difluoroethane in the presence of hydrogen at a temperature of greater than or equal to 400° C.

Abstract: The present invention relates to a method for the polymerization of fluoromonomers using non-fluorinated polycaprolactone, and to the fluoropolymers formed thereby. Specifically, the method of the polymerization uses one or more polycaprolactone, or salts thereof.

Abstract: A novel aqueous polymerization process for making fluoropolymer dispersions is disclosed in which non-ionic non-fluorinated emulsifier is used to produce fluoropolymer emulsions. The emulsifiers used in the invention are those that contain segments of polyethylene glycol, polypropylene glycol, and/or polytetamethylene glycol with repeating units of 3 to 100. The process and fluoropolymer produced contain no fluorinated surfactant.

Abstract: The present invention relates to a symmetrical multi-layer tube based on polyamide and ethyl vinyl alcohol (EVOH) or polyvinyl alcohol (PVOH) for transferring fluids. As examples of tubes for transferring fluids, mention may be made of fuel (gasoline, diesel fuel) pipes, in particular for carrying fuel from the tank to the engine of motor vehicles. Other examples of fluid transfer include, but are not limited to, the fluids used in fuel cells, CO2 systems for cooling, hydraulic systems, cooling circuits and air-conditioning circuits, and medium-pressure power transfer.

Abstract: The invention relates to an article formed by a rotational molding process, having at least one layer formed from a high molecular weight polyamide. The high molecular weight polyamide is one having a molecular weight in the range of 20,000 to 35,000 and also having an inherent viscosity of 1.05-1.60 dL/g. Rotomolded articles having a high molecular weight polyamide layer have better low-temperature impact performance compared to articles formed from lower molecular weight polyamides.

Abstract: The invention relates to foamed polyvinylidene tubular structures—and particularly those for use as conduit. The tubular structures may be corrugated, and are especially useful for fiber-optic plenum conduit. The polyvinylidene foam may also be directly applied to fiber optic cable.

Abstract: The invention relates to compositions of polyvinylidene fluoride (PVDF) and its copolymers that have been modified with an onium salt. The PVDF compositions exhibit an increased melting point, a reduced heat distortion and piezo properties. The improved properties can be further enhanced through annealing, and/or the addition of nanoclays. Additionally, the combination of PVDF, nanoclays and annealing can also produce a PVDF with an increased melting point and piezoelectric properties.

Abstract: The invention relates to multi-layer composites for use as a screen, having at least three layers, with an inner diffusing layer and at least one substrate layer on either side. The diffusing layer contains small particles having a narrow particle size distribution that are refractive-index mismatched with the polymer matrix. The multi-layer acrylic composition is useful as a projection screen.

Abstract: The present invention relates to materials exhibiting the property of rubbery elasticity, consisting of molecules with a mass of between 9 and 9000 g/mol, all or some of the molecules having at least three groups (also referred to as “associative groups”) capable of associating via non-covalent interactions. Although consisting of small non-polymerized molecules that are not chemically crosslinked, this material exhibits properties of rubbery elasticity. According to an embodiment of the invention, this material exhibits rubbery elasticity at ambient temperature. Above a certain temperature, the material flows like a simple liquid. The material is thermoreversible, i.e. after cooling, the material again exhibits the property of rubbery elasticity. This material is self-repairing and potentially recyclable, which is never the case with a chemically crosslinked elastomer.

Abstract: The invention relates to a coating composition comprising a radiation grafted functionalized fluoropolymer. This coating is preferably, in the form of a powder coating. The coating can be used on inorganic substrates, especially un-primed metals. The invention also relates to the coated inorganic substrate and to the use of the coating composition to protect the inorganic substrate, especially from corrosion.

Abstract: The invention concerns a conductive composition comprising (by weight): 30 to 60 parts of a fluid PVDF; 25 to 62 parts of a viscous PVDF; 8 to 13 parts of a conductive filler; 0 to 2 parts of a fire retardant agent; 0 to 0.05 parts of a nucleating agent, based on a total of 100 parts. Preferably, it comprises by weight: 35 to 50 parts of a fluid PVDF; 45 to 55 parts of a viscous PVDF; 8 to 13 parts of a conductive filler; 0 to 2 parts of a fireproof agent; 0 to 0.05 parts of a nucleating agent, based on a total of 100 parts. Preferably, the conductive composition has a viscosity in the molten state at 230° C. of less than 106 Pa·s, preferably between 102 and 106 Pa·s. The invention also concerns multilayer structures combining the conductive composition and a thermoplastic polymer or a metal.

Abstract: The invention relates to a translucent, white, light-diffusing thermoplastic composition containing both white pigment and refractive index-matched particles. The blend of pigment and particles provides a synergistic effect, resulting in a very high luminous transmission and good diffusion properties.

Abstract: A novel aqueous polymerization process for making fluoropolymers is disclosed in which non-ionic non-fluorinated emulsifier is used to produce fluoropolymer emulsions. The emulsifiers used in the invention are those that contain segments of polyethylene glycol and/or polypropylene glycol with repeating units of 3 to 100.

Abstract: The present invention is directed to an article of manufacture having differently colored layers which, when viewed from the edge, change color depending on the angle of view. The articles can be used in decorative or eye-catching displays suitable for displaying information or promoting objects.

Abstract: The invention includes a grafted copolymer derived from the grafting: of an SMA copolymer (II) derived from the copolymerization of at least two monomers, (i) the first monomer chosen from styrene and its derivatives and (ii) the second monomer including at least one anhydride functional group, with molecules belonging to the family of triazoles; used as the majority composition or additive of liquid compositions intended to be applied in or on sheets of paper or cardboard, onto hard surfaces, on leather or on textiles.

Abstract: This invention discloses a multilayer article prepared by rotational molding that comprises: a) a layer A comprising a functionalized fluoropolymer; b) a layer B comprising a non-fluoropolymer containing functional groups; and c) optionally a layer C prepared from a polymer that is dissimilar from that of layer A and that is similar to or dissimilar from that of layer B and is adjacent to layer A and/or layer B and, if present, is characterized in that it has good adhesion to layer A and/or to layer B and is not a blend of layer A and layer B.

Abstract: The present invention relates to a process for the preparation of polyamide-12 powder by anionic polymerization of lauryllactam in solution in a solvent of the lactam, the polyamide-12 powder being insoluble in this solvent, the polymerization being carried out: in the presence of a catalyst and of an activator; in the presence of a finely divided organic or inorganic filler, the proportion of this filler being less than or equal to 1.5 g per 1000 g of lauryllactam; and in the presence of an amide of formula R1—NH—CO—R2 in which R1 can be replaced by an R3—CO—NH— or R3—O— radical and in which R1, R2 and R3 denote an aryl, alkyl or cycloalkyl radical, the proportion of this compound being between 0.001 mol and 0.030 mol per 1000 g of lauryllactam.

Abstract: The present invention relates to a method for the polymerization of fluoromonomers using non-fluorinated alkyl phosphonate surfactants, and to the fluoropolymers formed thereby. Specifically, the method of the polymerization uses one or more alkyl phosphonic acids or salts thereof.

Abstract: The present invention relates to a method for radiation grafting a compound by irradiation, that can be grafted onto a fluoropolymer, so as to prevent destabilization of the fluorinated polymer. Said method comprises the following steps: a) the fluoropolymer is mixed in the melted state thereof with a graftable compound; b) the mixture obtained in a) is converted into films, plates, granulates or powder; c) the products from step b) are subjected to photonic (?) or electronic (?) irradiation in a dose of between 0.5 and 15 Mrad; and d) optionally, the products from step c) are washed and/or a degassed. According to said method, a stabilizing agent is added to the fluorinated polymer. Said stabilizing agent can be an antioxidant, a graftable metal salt, or a combination of the two. The invention also relates to structures comprising at least one layer of said mixtures and at least one layer of another material, and to the use of said structures to obtain a barrier effect.

Abstract: The invention relates to a novel acrylic impact sheet having bullet-resistant properties. The bullet-resistant sheet is composed of a copolymer of methyl methacrylate and a C2-18 alkyl methacrylate, plus impact modifiers that are refractive index matched or mismatched with the polymer matrix. The sheet provides very good bullet resisting performance, with better performance at the same thickness as current products, or the same performance at less thickness, thereby providing a product having better properties and/or less weight. The reduced weight of a bullet resistant acrylic sheet formulation will provide reduced raw material, transportation, and construction costs. Bullet resistant transparent glazing is an especially useful application for the invention.