Optical film with co-continuous phases
First Claim
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1. An optical body, comprising:
- an open-celled polymeric birefringent first phase; and
a substantially nonbirefringent second phase disposed within the cells of said first phase;
wherein the absolute value of the difference in index of refraction of said first and second phases is Δ
n1 along a first axis and Δ
n2 along a second axis orthogonal to said first axis, and wherein the absolute value of the difference between Δ
n1 and Δ
n2 is at least about 0.05.
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Abstract
An optical film is provided which comprises a disperse phase of polymeric particles disposed within a continuous birefringent matrix. The film is oriented, typically by stretching, in one or more directions. The size and shape of the disperse phase particles, the volume fraction of the disperse phase, the film thickness, and the amount of orientation are chosen to attain a desired degree of diffuse reflection and total transmission of electromagnetic radiation of a desired wavelength in the resulting film.
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1 Claim
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1. An optical body, comprising:
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an open-celled polymeric birefringent first phase; and a substantially nonbirefringent second phase disposed within the cells of said first phase; wherein the absolute value of the difference in index of refraction of said first and second phases is Δ
n1 along a first axis and Δ
n2 along a second axis orthogonal to said first axis, and wherein the absolute value of the difference between Δ
n1 and Δ
n2 is at least about 0.05.
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Specification