Showing papers on "Plastomer published in 2000"

Flexible compositions based on propylene polymers

Abstract: The invention concerns flexible compositions free of elastomeric fractions comprising: A) 10 to 90 parts by weight of statistic propylene polymer and of at least one comonomer selected among ethylene and C1-C4 alpha-olefins having a melting point not less than 100 °C and not more than 140 °C and a melt index measured at 230 °C under a load of 2.16 kg (ASTM D 1238 standard, 1986) of 0.5 to 15 g/10 min; and B) 90 to 10 parts by weight of plastomer produced by the intervention of a metallocene catalyst and consisting of a statistic ethylene copolymer and of at least a C3-C10 alpha-olefin having a density of 0.860 to 0.920 g/cm3, a melt index in melted state measured at 190 °C under a load of 2.16 kg (ASTM D 1238 standard, 1986) from 0.5 to 30 g/10 min and a molecular mass distribution M?w?/Mn not less than 4. Said exhibit excellent compromise between flexibility and cold impact resistance and temperature resistance. They are suited for producing shaped flexible articles, and more particularly, for making, by extrusion, films, flexible sheets and cables.

Morphology, mechanical properties, and failure topography of semi-interpenetrating polymer networks based on natural rubber and polystyrene

Abstract: Semi-interpenetrating networks (semi-IPNs) were prepared from natural rubber (NR) and polystyrene (PS) by the sequential method. In these semi-IPNs the NR phase was crosslinked while the PS phase was uncrosslinked. Different initiating systems such as dicumyl peroxide (DCP), benzoyl peroxide (BPO), and the azobisisobutyronitrile (AIBN) system were used for polymerizing the PS phase. The blend ratio was varied by controlling the swelling of NR in the styrene monomer. The mechanical properties of the semi-IPNs, namely, density, tensile strength, tear strength, elongation at break, tension set, tensile set, impact strength, and hardness, were determined. The morphology of different IPNs was studied using scanning electron microscopy. A compact morphology with a homogeneous phase distribution was observed in the semi-IPNs. The properties of the semi-IPN do not change much with the initiating system. However, in most cases, the DCP initiating system showed slightly superior performance. The tensile and tear-strength values of the IPNs were found to increase with increasing plastomer content. The crosslink density of the semi-IPNs also increased with increase in the polystyrene content. The experimental values were compared with theoretical models such as series, parallel, Halpin Tsai, Coran, Takayanaki, Kerner, and Kunori. The tensile and tear-fracture surfaces were examined using a scanning electron microscope. The fracture patterns were correlated with the strength and nature of the failure. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 2327–2344, 2000

Impact copolymer and plastomer blend

Abstract: A polymeric material suitable for fabrication into an article and particularly a polymeric material suitable for fabrication into an article suitable for receiving paint is provided. The polymeric material may be a blend of impact copolymer and plastomer. The impact copolymer includes between 95 and 78 wt % homopolypropylene and between 5 and 22 wt % of ethylene-propylene rubber, wherein ethylene propylene rubber may have less than about 50 wt % ethylene. The plastomer may be an ethylene/hexene plastomer. The ethylene/hexene plastomer may have a density in the range from 0.88 to 0.915 g/cc and a melt index (dg/min) from 0.8 to 10. The impact copolymer may be present in the blend in a range of 95 to 70 wt % and the ethylene/hexene plastomer may be present in the blend in a range from 5 to 30 wt %. The propylene, ethylene and hexene components may be present in the blend in respective ranges of 73.2 to 84.2 wt %, 14.3 to 23.1 wt % and 1.5 to 3.7 wt %.

Premium stretch multilayer film products

Abstract: The present invention provides improved multi-layer general purpose stretch film products. The products comprise at least five layers. In accordance with one embodiment, the present invention is directed to a multi-layer film comprising at least two outer layers, two inner layers and a core layer. A first outer layer represents from 8 to 25 percent by weight of the film and comprises a blend of linear low density polyethylene, a metallocene catalyzed linear low density polyethylene, an ethylene plastomer and an ethylene/methyl acrylate copolymer. A first inner layer represents from 15 to 35 percent by weight of the film and comprises a blend of linear low density polyethylene and a metallocene catalyzed linear low density polyethylene. A core layer represents from 15 to 35 percent by weight of the film and comprises a blend of linear low density polyethylene and polypropylene. A second inner layer represents from 15 to 35 percent by weight of the film and comprises a blend of linear low density polyethylene and a metallocene catalyzed linear low density polyethylene. A second outer layer represents from 8 to 25 percent by weight of the film and comprises a blend of linear low density polyethylene, a metallocene catalyzed linear low density polyethylene, an ethylene plastomer and an ethylene/methyl acrylate copolymer. The second outer layer is optionally different than the first outer layer and comprises a linear low density polyethylene.

U-shaped elastomer or plastomer profile and method for fixing the same on a frame

Abstract: The U-section profile with a base having a lateral web belonging to a seal (2) is intended to cover and be fixed in a rabbet (6) An adhesive material (4) is added to the inside and stuck to the internal surface of the profile base An electrical conductor (5) is buried in the elastomer constituting the profile or in the cord of adhesive material It is able to be connected at its ends to an electrical current source in order to heat the adhesive material

Medical adhesive tape or sheet and first-aid adhesive plaster

Abstract: PROBLEM TO BE SOLVED: To provide a medical adhesive sheet and a first-aid adhesive plaster which use a support base material with an appropriate flexibility and stress relieving property and a good feeling as a substitute for a support base material made from a polyvinyl chloride resin, and which are adapted for bonding to a flexural part such as the knee. SOLUTION: A film for a support base material is molded containing 10 to 200 pts.wt. of a silicic acid compound such as zeolite or talc for 100 pts.wt. of a thermoplastic resin, such as polypropylene resin, a blend of polypropylene resin and an elastomer and/or plastomer, or a copolymer of polypropylene resin, an elastomer and/or plastomer. The film is used as a support base material and an adhesive layer made of an acrylic adhesive is provided on the support base material to obtain a medical adhesive tape or sheet. Further, a liquid- absorbing pad is provided in the central region of the surface of the adhesive layer to obtain a first-aid adhesive plaster.

Plastomer asphalt waterproof coiled material

Abstract: The utility model relates to plastomer asphalt waterproof coiled material. APP plastomer modified asphalt is used as a waterproof base layer, the upper and the lower surfaces of the waterproof base layer are covered with an upper and a lower surface covering layers, and reinforced tire casings made of fiber glass feels or polyester feels are contained and clamped in the waterproof base layer. The utility model has the advantages that not only is the high temperature resistant performance favorable and can the high temperature of 110 DEG C be resisted, but also the low temperature performance is favorable, and the low temperature of from-5 DEG C to-15 DEG C can be resisted without brittle fractures; the chemical corrosion resistance performance is favorable; the ageing resistant performance is strong.

Elastomer or plastomer profile with semi-rigid, apertured or wire reinforcing material

Abstract: The portion of the profile susceptible to visible surface irregularities due to the frame (6) has an external coating (8) made of a second elastomer. A layer (9) of a cellular material compatible with the elastomers is included between the two elastomers.

Wire carrier for elastomer or plastomer profiles and method for manufacturing the same

Abstract: The sealing gasket for motor vehicle bodywork has a continuous wire (1), which is curved to provide an undulating profile. The parts of the undulations between the bends are connected by binding wires (2). The wire is of thermoplastic material which is compatible with the plastic of the gasket. At least the parts of the wire corresponding to the bends is flattened. Claims include a method for making the gasket

Rigid reinforcement for elastomer or plastomer profile and profile with that reinforcement

Abstract: The armature comprises a solid part (2) contiguous with a longitudinal end of the band. First regularly spaced strips (3) project laterally relative to the solid part perpendicular to its edge. Two second strips (4) which extend the first strip laterally are regularly spaced from each other.

Sheet comprising a corrugated surface, especially for the realisation of reinforcements for plastomeric or elastomeric profiles

Abstract: Hoop iron comprises two metallic sheets, first one (1) planed, and second one (2) with grooved section, attached together us glue or spot welding. When used for plastomer or elastomer sections, each sheet has thickness between 0.1 to 0.2 mm, global thickness is then between 0.5 to 0.60, due to allowances for grooves. An Independent claim is also included for the polymer or elastomer section.