US 2006/0141218 A1 · Uniaxially oriented articles having structured surface

Abstract

Uniaxially Oriented Articles Having Structured Surface A process for uniaxially stretching films is 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. Structured surface articles are also described. The articles have substantially the same uniaxial orientation throughout the film, including the geometric structure. Uniaxially oriented articles having structured surfaces are described. The articles have dimensional relationships as follows: the (a) ratio of the thickness of the body (Z′) to the height of the geometric feature (P′) is at least about 2; or (b) the ratio of body thickness to feature height (Z′:P′) is at least about 1 and the ratio of feature height to feature separation (P′:FS′) is at least about 1; or (c) the ratio of body thickness to feature height (Z′:P′) is at least about 1 and the ratio of feature base width to feature separation (BW′:FS′) is at least about 1; or (d) the ratio of body thickness to feature base width (Z′:BW′) is at least about 3; or (e) the ratio of body thickness to feature base width (Z′:BW′) is at least about 1 and the ratio of feature height to feature separation (P′:FS′) is at least about 1; or (f) the ratio of body thickness to feature base width (Z′:BW′) is at least about 1 and the ratio of feature base width to feature separation (BW′:FS′) is at least about 1; or (g) the ratio of feature base width to feature top width (BW′:TW′) is at least about 2 and the ratio of feature base width to feature separation (BW′:FS′) is at least about 1.

Claims20

Dependent claims

A uniaxially oriented structured article comprising:

(a) a polymeric body having (i) a first 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;
and
(b) a surface portion comprising a linear geometric feature disposed on the first surface of the polymeric body, the linear geometric feature being disposed on the body in a direction substantially parallel to the first in-plane axis of the polymeric film;
ratio of the thickness of the polymeric body to the height of the geometric feature is at least about 2.

1 more element

Dependencies are inferred from the claim text.

Uniaxially oriented articles having structured surface

Life of this patent

Uniaxially oriented articles having structured surface

Life of this patent

Abstract

Claims20