Patent ID: 8142697
Filing Date: 2012-03-27
Classification: B29C,B29K,C08K

Abstract:
1. A process for solid state drawing a polymer composition to produce an oriented polymer composition article, the process comprising the steps: (a) providing a polymer composition comprising thirty weight-percent or more and 95 weight-percent or less of an inert inorganic filler based on polymer composition weight and a continuous phase of at least one orientable polymer, the polymer composition having a melt temperature; (b) conditioning the temperature of the polymer composition to a drawing temperature that is fifteen degrees Celsius or more and forty degrees Celsius or less below the polymer composition's softening temperature; and (c) drawing the polymer composition though a drawing die at a drawing rate of at least 0.25 meters per minute and with a nominal draw ratio of 1.25 or more and 8 or less to produce a drawn polymer composition article that comprises less than three weight-percent blowing agent based on polymer composition article weight, and has a density of less than 0.8 grams per cubic centimeter, a flexural modulus of 1.4 gigapascals or more, cross sectional dimensions all greater than 1.5 millimeters, a delamination force value greater than 44.5 Newtons and void volume proximate to the inorganic filler.