Prepare an oriented polymer composition that is cavitated, has cross sectional dimensions all at least three millimeters and at least one de-oriented surface layer having a thickness of at least 80 microns and at least 50 microns less than half the thickness of the oriented polymer composition, the de-oriented...http://www.google.es/patents/US7824756?utm_source=gb-gplus-sharePatente US7824756 - Oriented polymer composition with a deoriented surface layer
Oriented polymer composition with a deoriented surface layer
