Abstract: Plane structure composed of a cohesive assembly of contiguous cellular cells having any cross section and essentially parallel walls from one cell to another, characterized in that the walls of the cells comprise at least two portions based on different polymeric compositions, the junction between said portions being substantially parallel to the plane of the structure.

Abstract: Multilayer polymer structure comprising at least one couple of adjacent layers (L1-L2), characterized in that: layer (L1) comprises at least one polymer composition (C1) comprising at least one semi-crystalline polyphthalamide and at least one impact modifier (I1), and layer (L2) comprises at least one polymer composition (C2) comprising at least one functionalized polyolefin (FPO2), said functionalized polyolefin comprising functional groups chosen from carboxylic groups, their esters, their anhydrides and their salts. Process for manufacturing said multilayer structure, which comprises co-extruding polymer compositions (C1) and (C2) so as to obtain couple of adjacent layers (L1-L2). Shaped article comprising the invented multilayer structure and process for manufacturing the shaped article.

Abstract: Process for the manufacture of a multi-layered polymer body comprising at least one reinforcing layer composed of an oriented polymer and at least one basic polymer layer directly in contact with at least a part of the reinforcing layer, wherein the polymer of the basic layer is compatible with the oriented polymer of the reinforcing layer, characterized by the steps of (a) applying the basic polymer layer as a stream of molten polymer to at least a part of the surface of the reinforcing layer; and (b) solidifying the molten polymer on the surface of the reinforcing layer by rapid cooling.

Abstract: A process for producing a multilayer plastic pipe protected from deterioration of its properties when being used and when being handled.

Abstract: Hollow bodies made from impact-modified polyamide. Fuel line hoses for both liquid fuel delivery and fuel vapor recovery.

Abstract: Method of assembling the elements of a structure comprising a honeycomb core Method of assembling the elements of a structure comprising a cellular honeycomb core by welding using electromagnetic radiation, in which the structure is based on a plastic transparent to electromagnetic radiation, and at least one of the elements to be assembled comprises, in the vicinity of at least one part of its surface, a layer that at least partly absorbs the electromagnetic radiation, the welding taking place by the melting of this layer by means of the electromagnetic radiation in the weld zones.

Abstract: Reinforced pipe obtained by winding, onto a tubular support based on a polymeric composition, of reinforcing tapes comprising an oriented polymeric composition in layers crossed at an equal but opposite angle relative to the axis of the pipe. The tapes are selected from those whose polymeric composition exhibits particular mechanical strength properties in tension.

Abstract: An extrusion head for the manufacture of tubes including at least one layer of expanded plastic by extruding a stream of molten plastic containing a blowing agent through an annular passage cross section made in the extrusion head. The stream of molten plastic containing the blowing agent spreads out circumferentially and welds itself to itself by the recombining of the two stream fronts. The extrusion head is equipped with a special-purpose thermal regulation device allowing the molten plastic containing the blowing agent to be heated or cooled after the stream fronts have recombined.

Abstract: Assembly process and plastic composite tube Process for assembling, by fusion bonding using IR laser radiation, plastic multilayer tapes that comprise an oriented layer that is transparent to the radiation and a layer that absorbs this radiation, the tapes being fusion-bonded using the same technique to a plastic preformed support. Composite tube resulting from the fusion bonding of these tapes to a plastic core.

Abstract: Multilayer plastic pipe and its manufacturing process, the pipe being protected from deterioration of its properties, when being used and when being handled, and formed from a tubular polymeric support protected by two protective layers each comprising a polymeric composition of unoriented structure, the first layer being compatible with the polymeric composition of the subjacent plastic and the second being an external layer, also serving as finishing coat. A reinforcing layer formed from tapes comprising an oriented polymeric composition may be inserted between the support and the first protective layer.

Abstract: Reinforced pipe obtained by winding, onto a tubular support based on a polymeric composition, of reinforcing tapes comprising an oriented polymeric composition in layers crossed at an equal but opposite angle relative to the axis of the pipe. The tapes are selected from those whose polymeric composition exhibits particular mechanical strength properties in tension.

Abstract: Plastic object, in particular a pipe, made impermeable by a thin layer based on a liquid-crystal polymer (LCP) in the form of tapes wound on top of its external surface and mechanically reinforced by an outer layer comprising an oriented polymer.

Abstract: Plastic pallet comprising at least one single-piece platform obtained by extrusion and resting on spacers, the platform of which is a hollow profile consisting of two substantially flat parallel elements connected by partitions .

Abstract: The invention relates to an extrusion head for the manufacture of tubes comprising at least one layer of expanded plastic by extruding a stream of molten plastic containing a blowing agent through an annular passage cross section made in the extrusion head and in which the stream of molten plastic containing the blowing agent spreads out circumferentially and welds itself to itself by the recombining of the two stream fronts, the said extrusion head being equipped with a special-purpose thermal regulation device allowing the molten plastic containing the blowing agent to be heated or cooled after the stream fronts have recombined.

Abstract: A process for processing a thermoplastic, which includes, in succession, the following steps: (1) a molten semicrystalline thermoplastic extrudate is cooled to a temperature T1 which is greater than the crystallization temperature (Tc) of the thermoplastic and is less than Tf+5° C., Tf denoting the melting point of the thermoplastic; (2) next, the extrudate is drawn in the molten state; (3) next, the extrudate is relaxed, at a temperature T3 which is between Tc and Tf, for a duration at least equal to the average relaxation time (&tgr;3) of the thermoplastic at the relaxation temperature, and after the drawing; (4) next, the extrudate is quenched to a temperature T4 which is less than Tc.

Abstract: The invention relates to an article of which at least one surface zone comprises at least one polyolefin and has been printed by means of a toner by an electrophotographic technique, characterized in that the printed zone contains no toner printing primer and in that the adhesion of the toner to the article is such that it withstands a stripping force of at least 0.4 N/mm exerted by means of an adhesive tape. It also relates to a process for the manufacture thereof.

Abstract: Process for manufacturing a blown film essentially consisting of an aliphatic polyester, according to which: (1) the polyester is synthesized from at least one cycloaliphatic ester, with the intervention of an initiator comprising at least one metal trialkoxide and/or metal tetraalkoxide, in an extrusion device; (2) the polyester is extrusion blow-moulded, immediately after it has been synthesized in the said extrusion device, fitted for this purpose with an extrusion blow-moulding die, with a swelling ratio of at least 2.5. The invention also relates to a film essentially consisting of an aliphatic polyester, which can be obtained according to the process of one of the preceding claims, in which the modulus of longitudinal elasticity (LE) and the modulus of transverse elasticity (TE) and the longitudinal shrinkage (LS) and transverse shrinkage (TS), these shrinkages being measured at a temperature about 5° C.

Abstract: A process for preparing thermoplastics comprising the steps of cooling an extrudate to a temperature T1, drawing the molten extrudate, relaxing the extrudate at a temperature T3 for a duration of at least the average relaxation time of the thermoplastic at the relaxation temperature, and quenching the extrudate to a temperature T4. The process enables the manufacture of films consisting of at least one propylene homopolymer with a thickness of 100 to 250 &mgr;m and having a hot shrinkage of at most 20%, a haze of less than or equal to 3% and a total transparency with respect to air of greater than 70%.

Abstract: The invention relates to a process for the surface treatment of at least one portion of an article comprising at least one plastic material, the process comprising a step of fluorination for out most 12 seconds, following a step of an energetic surface oxidation of this portion.

Abstract: A poly-.epsilon.-caprolactone film whose weight-average molecular mass is equal to at least 75,000 g/mol having a modulus in tension of at least 600 MPa in the transverse and longitudinal direction and a shrinkage not exceeding 1% in both directions below the poly-.epsilon.-caprolactone melting zone. The process for producing the poly-.epsilon.-caprolactone film comprises online extrusion of the poly-.epsilon.-caprolactone through a die having a temperature not exceeding 160.degree. C. immediately following its polymerization using aluminum trialkoxide as initiator. The films according to the invention are suitable for producing films for packaging, for the protection of produce or for diapers.