Patent ID: 8202467
Filing Date: 2012-06-19
Classification: B29C,B29K,B29L,Y10T

Abstract:
1. A method for extruding a transparent or translucent tubing used for medical or food contact applications, comprising: providing from 90 to 100%, based on the weight of the tubing, of a propylene-based polymer comprising propylene derived units and one or more dienes, the propylene-based polymer having a triad tacticity of from 50% to 99% and a heat of fusion of less than 80 J/g, and wherein the propylene-based polymer comprises from 5 to 25 wt %, by weight of the polymer, of C extruding the propylene-based polymer in the absence of processing oil into tubing; and then crosslinking the extruded tubing via electron-beam irradiation at least 5 Mrad, wherein the extruded tubing has a haze value of about 40% or less, and has a xylenes insoluble level of 76% to 90%.