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US 2006/0138686 A1Published application
Method of making a uniaxially stretched polymeric film having structured surface
OwnerAndrew Ouderkirk, Rolf Biernath +3inventors
InventorsAndrew Ouderkirk, Rolf Biernath, William Merrill, Olester Benson, David Kowitz
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Abstract
A process for uniaxially stretching films having a structured surface comprising a geometric feature is described. The process provides a film in which the cross sectional shape of the feature after stretching is substantially identical to the cross sectional shape of the feature prior to stretching.
Claims20
A method of making a structured surface polymeric film comprising the steps of:
- (a) providing a polymeric film having (i) a first structured and a second surface, and (ii) first and second in-plane axes that are orthogonal with respect to each other and a third axis that is mutually orthogonal to the first and second in-plane axis in a thickness direction of the polymeric film, wherein the first structured surface comprises at least one geometric feature thereon;
- and subsequently
- (b) stretching the structured surface polymeric film in a direction substantially parallel to the first in-plane axis of the polymeric film;
- wherein the cross sectional shape of the geometric feature before step (b) is substantially retained after step (b).
1 more element
Dependencies are inferred from the claim text.