Patent ID: 7303642
Filing Date: 2007-12-04
Classification: B29C,B32B,Y10T

Abstract:
1. A method for making a corrugated multi-microlayer polymer film comprising the steps of: forming a multi-microlayer film comprising a plurality of first polymer microlayers and a plurality of second polymer microlayers in an alternating arrangement, each first polymer microlayer comprising a first polymer having a first recovery percentage and each second polymer microlayer comprising a second polymer having a second recovery percentage, wherein the first recovery percentage is greater than the second recovery percentage and the first polymer is an elastomeric polymer; applying one or more mechanical forces sufficient to partially delaminate the first polymer microlayers from the second polymer microlayers; and removing the one or more mechanical forces, wherein the difference in the first and second recovery percentages is sufficiently large so that the second polymer microlayers recover less of their original shape than the first polymer microlayers, thereby forming a corrugated multi-microlayer film comprising a plurality of corrugations.