Processes and apparatus for making transversely drawn films with substantially uniaxial character
Assignee3M Innovative Properties Company
InventorsWilliam Ward Merrill, Jeffery N. Jackson, Andrew T. Ruff, John A. Wheatley, Dennis L. Krueger
Life of this patent
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Abstract
A roll of multilayer optical film is described. The roll includes a substantially uniaxially-oriented multilayer optical film, where at least one layer of the multilayer optical film has indices of refraction in a length direction and a thickness direction that are substantially the same, but substantially different from an index of refraction in a width direction.
Claims2
A roll of multilayer optical film, the roll comprising a multilayer optical film, wherein at least one layer of the multilayer optical film has indices of refraction in a length direction and a thickness direction that are substantially the same, but substantially different from an index of refraction in a width direction;
- and wherein the roll of multilayer optical film has been substantially uniaxially drawn, in that for U=(1/MDDR−1)/(TDDR1/2−1), U is at least 0.85, with MDDR defined as the machine direction draw ratio and TDDR defined as the transverse direction draw ratio.
Dependencies are inferred from the claim text.