Abstract: Crystalline propylene (co)polymers modified by grafting with a vinylpolybutadiene having 1,2-structure content of at least 10%.Said (co)polymers are reacted with a liquid vinylpolybutadiene in the presence of a non-peroxidic radical initiator at a temperature in the range 200.degree. to 350.degree. C., the liquid vinylpolybutadiene having a 1.2-structure content of at least 10% and being generally used in amounts within the range 0,5 to 20% by weight.

Abstract: Crystalline propylene (co)polymers modified by grafting with a vinylpolybutadiene having 1,2-structure content of at least l0%.The (co)polymers are reacted with a liquid vinylpolybutadiene in the presence of a non-peroxidic radical initiator at a temperature in the range 200.degree. to 350.degree. C., the liquid vinylpolybutadiene having a 1,2-structure content of at least 10% and being generally used in amounts within the range 0.5 to 20% by weight.

Abstract: An apparatus for injection molding of non-precatalyzed resins. Catalyst and resin flows are injected into a mixing chamber through a pair of catalyst injection nozzles and a pair of resin injection nozzles, each angled toward the ejectment end of the mixing chamber. The resin injection nozzles are located closer to the ejectment end of the mixing chamber than the catalyst injection nozzles. The injection nozzles are arranged substantially 90.degree. from one another with the resin injection nozzles opposed from each other and the catalyst injection nozzles opposed from each other.

Abstract: Multilayer and multifunctional packaging elements having a high-absorption activity toward aqueous liquid substances as well as barrier properties toward gases such as oxygen and carbon dioxide are prepared by thermoforming.The packaging elements includes an inner porous layer, an intermediate absorbing layer and an outer sheet having high barrier properties toward gases. The intermediate layer may contain anti-bacterial agents.

Abstract: A device for moulding articles of composite material includes a pressurizable gasket and an injection head the end of which is flush with the impression of the mould. After low-pressure filling the mould impression with jets of resin and catalyst so oriented as to secure the mutual mixing thereof, the pressurizable gasket allows the half-moulds to be further approached to each other and obtaining thereby the impregnation of the reinforcer element previously charged into the mould impression.

Abstract: An improved method for injection molding of non-precatalyzed resins in which the catalyst and resin flows are injected in a mixing chamber co-current with one another angled toward the ejectment end of the mixing chamber, The resin flow is injected closer to the ejectment end of the mixing chamber than is the catalyst flow.

Abstract: A module for removing polluting agents from the surface of the sea consists of absorbent polyolefinic fibres enclosed inside a permeable sheath having a short-length bundle configuration with a star-like or lenticular cross-section. After absorbing oily substances, the cross-section of the module becomes polygonal or circular.

Abstract: an apparatus for producing bodies of polymeric material having an outer shell and a core of foamed material is disclosed. The apparatus includes an extruder and accumulation chamber for extruding a tubular element, i.e., a parison, and a second extruder and accumulation chamber for injecting a foamable polymeric material for forming the core of the body inside the parison. The injection occurs inside the walls of a mold, which causes the tubular parison to undergo swelling due to the expansion of the foamable material until the parison conforms to the shape of the mold.

Abstract: A die for co-extruding structural shapes is provided with a central cylindrical duct through which the molten polymeric material destined to constitute the central core of the structural shape flows, and a conical gap, coaxial with the central duct, into which the polymeric coating material is fed which will constitute the outer skin of the structural shape.

Abstract: A process for fabricating manufactured articles from fiberglass reinforced thermoplastic sheets, which consists of forming said plates while they are heated at their melting point and coupled with a barrier film, by either blow-moulding or thermoforming.

Abstract: Oil-repellent polymeric compositions prepared by a process which comprises:a) adding at least a radical starter and at least a perfluoropolyether to at least a molten thermoplastic polymer;b) intimately mixing the resulting composition for a time which is sufficient to obtain macroradicals from the polymer; andc) cooling the final composition to room temperature.

Abstract: This invention relates to a high performance car bumper module having a covering front piece; a reinforcing element; and a system for controlled and reversible force displacement. The reinforcing element has a bow system which includes a pair of hinges, which are connected to each other with a tie-rod and a pair of hinge-fasteners. The controlled and reversible force displacement system comprises two hydraulic shock absorbers fastened on one end thereof to the bow system through the respective hinge fasteners, wherein each hinge-fastener includes a transverse slot.

Abstract: A process for preparing thermoinsulating and structural formal articles in which(a) a thermoplastic polymer sheet is heated at a temperature above its softening point;(b) the heated thermoplastic polymer sheet is thermoformed on a thermoinsulating foamed preform made of substantially the same polymeric material; and in which(c) prior to the thermoforming in step (b), the thermoinsulating foamed preform is cooled to prevent excessive collapse of the surface of the thermoinsulating foamed preform resulting from contact with the heated sheet.

Abstract: A process is taught for separating heterogeneous plastic material into homogeneous fractions, which comprises:a. feeding the plastic material in a triturated form to a first water-containing separation tank to separate the high specific weight products from the low specific weight products;b. recovering the mixture of high specific weight products from the bottom of said first separation tank and drying them in a first drier;c. treating the resulting mixture with a chemical agent capable of swelling/modifying the plastic materials which are sensible to said chemical agent; andd. drying the products so treated and feeding them to a second separation tank, in which the nonswollen/nonmodified plastic material precipitates while the remaining material, maintained on the surface, is discharged.

Abstract: Blow molding and thermoforming processes in which a mold system having low thermal inertia mold-halves provided with heating and cooling systems is utilized for producing plastic articles coated with surface-upgrading films of high melting polymers or polymers exhibiting a high scratch resistance to improve mechanical characteristics of the molded article. The films may be positioned, before the mold is closed, close to the low thermal inertia mold-halves. Rapid heating and rapid cooling of the mold-halves in contact with the surface-upgraded films permit strength adhesion of the upgrading material to the surface of the molded article.

Abstract: A process for preparing structural, heat-insulating shaped bodies which does not necessarily require the use of a foamed heat-insulating material obtained by the use of blowing agents belonging to the class of chlorofluorocarbons. The process includes inserting a heat-insulating pre-molded core inside a tubular element made from an extruded thermoplastic polymer; placing the extruded tubular element containing the pre-molded core into a blow-molding mold; and molding the tubular element into a shell by blow-molding. By subsequent mold closure, the shell adheres to the pre-molded core. An alternative process is disclosed for adhering the tubular element and pre-formed core by closing the mold and drawing a vacuum within the tubular element.

Abstract: This application discloses a grid for electric household appliances made from a thermoplastic polymer, comprising a peripheral edge whose perimeter is of substantially quadrangular shape, and a plurality of rods inserted inside said edge, parallel to one of the sides of the perimeter, and united to said edge without discontinuities.

Abstract: Process for preparing heat-insulating structural elements, which comprises the steps of:(a) applying to the convex portion of a first half-shell a layer of beads made from a semi-foamed or foamed thermoplastic polymer, in order to produce a layer with an essentially constant thickness;(b) sintering the beads; and(c) applying to the so obtained composite a second half-shell capable of fitting the shape of the sintered layer.