Showing papers on "Plastomer published in 1999"

Highly filled polyolefin plastomer formulations for possible PVC replacement in flooring

Abstract: Calcium carbonate highly filled composites of a polyolefin plastomer (POP), and its blends with postconsumer linear low-density or high-density polyethylene (PC-LLDPE or PC-HDPE) were prepared and evaluated. The mechanical properties of compounded POP and its blends were compared with those of a PVC–calcium carbonate formulation used for flooring applications. Tensile and impact properties of calcium carbonate-filled POP composites compare very favorably to the PVC-based formulation at filler loadings as high as 200 phr. Moreover, postconsumer LLDPE or HDPE can replace at least 50% of the POP in these composites without affecting their main properties. DSC analyses indicate that the synergism occurring in mechanical properties for some of the blend compositions, may be related to the ability of the individual polymers to cocrystallize in the respective blends. This article presents the results of a preliminary study. Continued research is expected to contribute toward a complete characterization of the compounded POP/postconsumer PE blends to establish if they can replace plasticized PVC compounds in some or all flooring applications. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 1156–1168, 1999

Gas barrier multilayer heat sealing film and its manufacture

Abstract: PROBLEM TO BE SOLVED: To provide a gas barrier multilayer heat sealing film having stable film forming suitability, excellent gas barrier properties, and heat sealability in a co-extruded multilayer film containing a gas barrier layer and a method for manufacturing it. SOLUTION: A barrier co-extruded multilayer film 10 comprises a heat sealing (HS) layer 5 having a density of at least 0.900 to 0.920 g/cm and made of a linear polyethylene, a cushion layer 4 made of a plastomer having a density of 0.880 to 0/cm , an adhesive resin layer 21, a gas barrier layer 3 having an ethylene content of 25 to 50 mol.% and occupying the EVOH of a saponification rate of 90% or more in 50 wt.% or more of the entirety, an adhesive resin layer 22 and a sticky layer 1 made of a low-density polyethylene for occupying 10% or more of the entirety in thickness.

Gas barrier multilayer heat sealing film and bag using it

Abstract: PROBLEM TO BE SOLVED: To provide a heat sealing film having heat sealability or particularly excellent sealability of a bent part in a co-extruded multilayer film containing a gas barrier layer. SOLUTION: A co-extruded multilayer film 10 comprises an HS layer 5 having a density of at least 0.900 to 0.920 g/cm and made of a linear polyethylene, a cushion layer 4 made of a plastomer having a density of 0.880 to 0/cm , an adhesive resin layer 21, a gas barrier layer 3 having an ethylene content of 25 to 50 mol.% and a saponification rate of 90% or more and made of a saponified ethylene vinyl acetate copolymer (EVOH), an adhesive resin layer 22 and a sticky layer 1 made of a low-density polyethylene for occupying 10% or more of the entirety in thickness.

Production of sealing profiles

Abstract: Elastomer and plastic, comprising plastomer or thermoplastic elastomer are permanently bonded together, forming composite material. Preferred Features: The bond is formed by extrusion. The plastic is introduced into recesses of an elastomeric profile strand, which has, or has not been stabilized by vulcanization. Such introduction takes place by injection. The plastic may be peripherally-coated or injected onto a vulcanized or unvulcanised elastomeric strand. The plastic may be shrunk as a casing onto such a strand. Advantages accrue. The frame sections and the seal may be both cut to length and welded, together. Thus manufacture is considerably simplified. Manufacture of frame and seal together, is a further outstanding simplification.

Sequential interpenetrating polymer networks of epoxidised natural rubber and alkyl methacrylates

Abstract: A number of sequential interpenetrating polymer networks (IPNs) were synthesised and characterised. The materials were prepared using epoxidised natural rubber (ENR) with 25 mole percent (ENR 25) or 50 mole percent (ENR 50) epoxy content with the second polymer component being either poly(methyl methacrylate) (PMMA), poly(ethyl methacrylate) (PEMA) or poly(butyl methacrylate) (PBMA). In the case of ENR 25/PMMA IPNs, materials with different composition ratios and crosslink densities in the elastomer and plastomer constituents were prepared. Attempts were made to produce grafted IPNs by copolymerising methacrylic acid (MAA) with the second polymer component. [Continues.]

“Single-Site” Catalyzed Polyolefin for Fresh-Cut Produce Packaging. A Comparison Between Monoextruded Blends and Coextruded Film

Abstract: The quality of produce is affected mainly by two factors, the chemical effect of atmospheric oxygen and growth of aerobic spoilage microorganisms. The most important criteria for good produce packaging are the selective permeability to specific gases such as oxygen, carbon dioxide, ethylene, and water vapor at normal storage temperatures. The concept of atmosphere modification inside the package has developed rapidly over the last decade. The artificial atmosphere created inside the package slows down the metabolic processes in the produce and significantly prolongs the shelf-life of the commodity. Modified atmosphere packaging (MAP) is a newly developed technique where the shelf life of pre-cut produce is extended by inhibiting chemical, enzymatic, and microbial spoilage. This allows preservation of the fresh state of the produce without the chemical treatments used for other shelf life extension processes. Traditionally, ethylene vinyl acetate (EVA) copolymers and ultra low-density polyethylene (ULDPE) have been used for these types of applications. However, new single-site catalyzed resins have replaced these resins because of some significant advantages such as excellent optical properties, very high oxygen transmission rate, and outstanding seal performance. A typical product structure used by many film processors is one-component monolayer films; resin blends extruded into monolayer films, or co-extruded films. Linear low-density polyethylene (LLDPE) and plastomer resins are used extensively in fresh-cut produce packaging applications. This chapter compares the properties of mono-extruded film of LLDPE/plastomer blends with coextruded film from the same materials at the same resin ratio.