초록 ▼

In a laminar extrusion, overlapping layers of an EVOH phase are dispersed into a PP or MAPP matrix phase incompatible with the EVOH phase to form a vapor, gas and/or organic liquids barrier. When the matrix phase is a PP phase, MAPP can be added to improve adhesion between the overlapping layers and

In a laminar extrusion, overlapping layers of an EVOH phase are dispersed into a PP or MAPP matrix phase incompatible with the EVOH phase to form a vapor, gas and/or organic liquids barrier. When the matrix phase is a PP phase, MAPP can be added to improve adhesion between the overlapping layers and the matrix phase. MEPR and/or PE can also be mixed with the EVOH and/or PP phase to adjust the mechanical properties of the extrusion. In order to produce the extrusion, a molten polymer blend including bodies of the EVOH phase dispersed in the PP or MAPP phase is first prepared and then extruded through a die unit. In the die unit, a converging extensional flow is produced to lengthen the dispersed bodies of EVOH phase in a first direction while a diverging extensional flow lengthens these bodies in a second direction transversal to the first one. Such lengthening of the bodies produces in the extrusion the overlapping layers of EVOH phase.

대표청구항 ▼

A process for producing a laminar polymer extrusion, comprising the steps of: preparing a molten blend including bodies of a first polymer phase dispersed in a matrix polymer phase incompatible with the said first phase; extruding the molten blend to produce the said extrusion, said molten blend bei

A process for producing a laminar polymer extrusion, comprising the steps of: preparing a molten blend including bodies of a first polymer phase dispersed in a matrix polymer phase incompatible with the said first phase; extruding the molten blend to produce the said extrusion, said molten blend being extruded through a die unit structure to produce a flow of said molten blend that lengthens, during extrusion, the dispersed bodies of the first polymer phase both in a first direction and in a second direction transversal to said first direction to produce in the extrusion a laminar structure including overlapping layers of said first polymer phase dispersed in the said matrix phase; and solidifying the extruded blend sufficiently rapidly to preserve the laminar structure.