Showing papers on "Plastomer published in 2010"

Automotive material with excellent flow, high stiffness, excellent ductility and low clte

Abstract: Composition having a melt flow rate MFR 2 (230 °C) in the range of 10 to 50 g/10min. said composition comprises two heterophasic polypropylenes comprising a propylene homopolymer matrix and an elastomeric copolymer. a plastomer and a mineral filler. wherein - said two heterophasic polypropylenes have different melt flow rates. - the first heterophasic polypropylene has a melt flow rate MFR 2 (230 °C) in the range of 3.0 to 30.0 g/10min and - the second heterophasic polypropylene has a xylene cold soluble (XCS) content in the range of 7.0 to 20.0 wt.-%.

Comparative Study of Rheological Behavior of Modified Binders for High-Temperature Areas

Abstract: The failures of the bituminous pavements are not only due to increase in traffic but also due to extreme climatic conditions prevailing in the country. There are very high and very low pavement temperatures that exist during different seasons of the year. Thus, climatic conditions play an important role in selecting the type of materials to be used in road construction. In order to increase the life of bituminous pavement, quality of bitumen needs to be enhanced. To achieve the improvement of binder, it is necessary to add the polymers to bitumen. In this study, two types of polymer — ethylene vinyle acetate (EVA), a plastomer, and linear styrene-butadiene-styrene (SBS), an elastomer — and crumb rubber (CR) were used. The changes of rheological properties of 60/70 grades bitumen modified with different percentages of CR, EVA, and SBS (3–9%) were studied. The rheological properties of the bituminous binders in terms of their complex modulus ( G∗ ) , stiffness and overall resistance to deformation, storage ...

Crystallization of an ethylene-based butene plastomer: the effect of uniaxial extension

Abstract: In this paper, the effect of uniaxial extension on the crystallization of an ethylene-based butane plastomer is examined by using rheometry coupled with differential scanning calorimetry (DSC). Uniaxial extension experiments were performed at temperatures below and above the peak melting point of the polyethylene in order to characterize its flow-induced crystallization behavior at extensional rates relevant to processing. The degree of crystallinity of the stretched samples was quantified by DSC, i.e., by analyzing the thermal behavior of samples after stretching. Analysis of the tensile strain-hardening behavior very near the peak melt temperature revealed that crystallization depends on temperature, strain, and strain rate. In addition, it was revealed that a very small window of temperatures spanning just 1–2°C can have a dramatic effect on polymer crystallization. Finally, flow-induced crystallization experiments at temperatures close to the peak melting point have shown the recrystallization of multiple crystalline structures within a polymer matrix, witnessed by double peaks within a narrow window of 89–93°C in the DSC thermographs, with the most demonstrable double peak behavior occurring at a temperature of 91°C, a temperature that is just 1°C cooler than the peak melt temperature of the polymer.

Characterization and prediction of long-chain branching in commercial polyethylenes by a combination of rheology and modeling methods

Abstract: By blending commercial long-chain branched polyethylenes, Dow AFFINITY™ (trademark of The Dow Chemical Company) PL 1840 Polyolefin Plastomer and Dow AFFINITY™ PL 1880 Polyolefin Plastomer, with the linear polyethylenes ExxonMobile Exact 3132 and Exact 3128 of very similar molecular weight and molecular weight distribution, we detect the effect of ultra-low levels of long-chain branching on linear rheological properties and validate a generalized “tube” model (the “hierarchical model”) for predicting this effect.

Calendered films of plasticized blends of plastomer and impact copolymer

Abstract: This invention relates to a film or sheet and a process to make a film or sheet having a thickness of 05 to 35 mils comprising a blend composition comprising: a) 4 to 50 wt % of one or more polypropylene-based TPO(s); and b) 30 to 80 wt % of one or more ethylene plastomer(s); and c) 05 to 35 wt % of one or more non-functionalized plasticizer(s) having a kinematic viscosity at 100° C of 4 to 300 cSt, a pour point of −20° C or less, and a flash point of 200° C or more; and d) 0 to 695 wt % of one or more filler(s); and wherein the blend composition is calendered into a film or sheet

Heat sealable and oriented multi-layer polypropylene-based films for shrink applications

Abstract: The present invention relates to a multi-layer oriented shrink film comprising a first and a second skin layer comprising a propylene-based polymer having a melting point greater than 130C and at least one core layer comprising a propylene-based plastomer or elastomer. The films are preferably primarily oriented in either the machine or the cross direction. These films are ideally suited for use as a shrink label which can be applied either as a CD shrink sleeve or applied using a continuous roll process. The films ideally have an overall density of less than 1.0 g/cm3, to facilitate recycling efforts.

Flexible sheet, method of manufacturing said sheet and applications thereof

Abstract: The invention relates to a flexible sheet comprising (i) a woven fabric comprising yarns containing polyethylene fibers; and (ii) a plastomer layer adhered to at least one surface of said woven fabric wherein said plastomer is a semi-crystalline copolymer of ethylene or propylene and one or more C2 to C12 α-olefin co-monomers and wherein said plastomer having a density as measured according to ISO1183 of between 870 and 930 kg/m3, wherein the flexible sheet has a shrinkage of at most 19%

Method for the manufacturing of a low shrinkage flexible sheet

Abstract: The invention relates to a method for the manufacturing of a low shrinkage flexible sheet, said sheet comprising a fabric containing polyolefin fibers, said method comprising the steps of: a) depositing a molten plastomer layer on at least one surface of the woven fabric to form a sheet having a thickness approximately equal with the sum of the thicknesses of said molten plastomer layer and of said fabric; and b) impregnating said fabric with at least part of the molten plastomer layer by drawing the sheet into a gap between two calendaring rollers at a temperature of between the melting temperature of the plastomer and the melting temperature as determined by DSC of the polyolefin fibers, said gap having a width smaller than the thickness of the sheet; wherein the width of the gap is chosen to apply an impregnation pressure on the sheet of at least 20 bars.

Thermaoplastic elastomer composition with improved compression set values

Abstract: Compounds comprising block copolymers and polyolefin plastomers and elastomers comprising a mixture of a low softening point polyolefin plastomer or elastomer and polypropylene wherein the low softening point polyolefin plastomer or elastomer is a copolymer of ethylene or propylene with one or more alpha-olefins as comonomer and has a Vicat softening point below 100°C, and a density between 850 and 910 g/dm3, show surprisingly good high temperature properties, in particular, when the polyolefin plastomers were added to compounds comprising block copolymers improved compression set values are obtained, particularly in the temperature range of from 85°C to 125°C.

Multilayer composite self-adhesive waterproof coiled material

Abstract: The utility model discloses a multilayer composite self-adhesive waterproof coiled material. The self-adhesive waterproof coiled material sequentially comprises a plastomer modified asphalt size layer, a reinforcing layer, an SBS modified asphalt size layer, a self-adhesive rubber asphalt size layer, and an anti-sticking insulating layer. The utility model can not only meet the requirements of roads, bridges, airport runways and the like for follow-up high-temperature asphalt concrete construction, but also solve the problems such as bonding, puncture prevention, cracking and the like.

Saw tooth belt

Abstract: Toothed belt (1) for use in contact with oil and comprising a body (2) and a number of teeth (4) extending from at least one surface of the body (2); the teeth are coated by a fabric (5); a resistant layer (8) comprising a plastomer based on fluorine with the addition of elastomeric material, in which the plastomer is present in a larger quantity than the elastomeric material, is applied by adhesion onto the coating fabric (5). The elastomeric material forming the body (2) of the belt (1) is a copolymer obtained from a dienic monomer and a monomer containing nitrile groups, in which the nitrile groups are between 33% and 49%, preferably 39%, in weight with respect to the copolymer.

Performance characteristics of modified bitumen with respect to its physical and rheological properties

Abstract: Bitumen is a complex polymeric mixture of hydrocarbon molecules and some functional groups. There are chemical changes occurring when bitumen is modified with a polymer or even during ageing. In order to enhance the performance and service properties of bitumen, polymers are added. Polymer Modified Bitumen (PMB) are used extensively in asphalt surfacing and seals. PMB has to characterised differently from viscosity grade bitumen and the improved performance properties are difficult to demonstrate with convention empirical rheological tests. The challenge in physical property characterization is to develop physical tests that can satisfactorily characterize key asphalt binder parameters and how these parameters change throughout the life of an HMA pavement. In India, the methods for rheological characterization of bituminous binders are inadequate to characterize the bitumen. Hence a complete rheological study and charaterization of bitumen using dynamic shear rheometer would be helpful. The changes in physical and rheological properties by the addition of Ethylene Vinyl Acetate (EVA), a plastomer, Linear Butadiene Styrene (SBS), an elastomer and Crumb Rubber (CR) are discussed in the paper to some extent.

Plug to seal a medicinal system

Abstract: Stopper with two opposite front sides, comprises a core and optionally one or more layers enclosing the core, where the stopper comprises: (a) a core of a plastic material from one or more polymers with a high resilience comprising e.g. polyphenylene oxide, or polyethylene copolymers; (b) optionally one or more intermediate layer(s) of a plastic material of one or more polymers of e.g. functionalized polypropylene, or styrene/ethylene/propylene copolymer; and (c) optionally an outer layer of a plastic material of one or more polymers of e.g. polyester, or polyethylene plastomer. Stopper with two opposite front sides, comprises a core and optionally one or more layers enclosing the core, where the stopper comprises: (a) a core of a plastic material from one or more polymers with a high resilience comprising polyphenylene oxide, polyethylene copolymers, ethylene vinyl acetate, styrene/ ethylene/butylene block copolymer, styrene/ethylene/propylene copolymer, polypropylene, medical white oil, styrene/butadiene/styrene copolymer, polybutylene, ethylene/propylene/diene-rubber, ethylene/propylene plastic, or styrene/butadiene/styrene block polymer; (b) optionally one or more intermediate layer(s) of a plastic material of one or more polymers of functionalized polypropylene, polyethylene, functionalized styrene/ ethylene/butylene block copolymer, polyethylene plastomer, polyethylene copolymer, ethylene-vinyl acetate, styrene/ethylene/propylene copolymer, oil, polypropylene, polyethylene, styrene/isoprene/styrene block copolymer, or polybutylene; and (c) optionally an outer layer of a plastic material of one or more polymers of polypropylene, polyester, polycarbonate, polyethylene copolymer, polyethylene plastomer, ethylene vinyl acetate, poly(cyclohexylene dimethylene cyclohexanedicarboxylate), glycol and acid comonomer or styrene/ ethylene/butylene block copolymer/styrene/ethylene/propylene copolymer, polymethylpentene, polybutylene, and/or soft PVC, where the material of the core (a) in the absence of the outer layer (c) or the material of the outer layer (c) of the stopper is flowable at greater than 90[deg] C. Independent claims are included for: (1) a method for producing the stopper, comprising producing a multilayer strand by coextrusion of plastic materials for the layers (a), (c) and optionally (b), (b1) optionally cooling the produced strand in step (a), and (c1) optionally winding up to a coil, optionally applying a notch, (d1) optionally coating the front side of the strand with a foil, (e1) cutting the strand to the desired length of the stopper, (f1) optionally applying a further notch, and (g1) optionally coating the other front side of the stopper with a foil as tamper evident closure; and (2) producing a medical bag, comprising (a11) providing the stopper that is provided optionally with one or two notch(es) and optionally with one or two coating(s), and two bag-like foils, (b11) placing the stopper between the two bag-like foils, (c11) producing the medical bag by welding the bag-like foils, and welding and performing a heat treatment for connecting the stopper with the bag-like foils, and (d11) optionally coating the outer front side of the stopper with a foil as a tamper evident closure.