Optical film with co-continuous phases
First Claim
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1. A polarizer, comprising an interpenetrating polymer network of first and second diverse thermoplastic polymers, wherein at least one of said first and second polymers is a polyester.
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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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Citations
44 Claims
- 1. A polarizer, comprising an interpenetrating polymer network of first and second diverse thermoplastic polymers, wherein at least one of said first and second polymers is a polyester.
- 4. A polarizer, comprising an interpenetrating polymer network of first and second diverse thermoplastic polymers, wherein said first polymer is a syndiotactic vinyl aromatic polymer derived from a vinyl aromatic monomer.
- 6. A polarizer, comprising an interpenetrating polymer network of first and second diverse thermoplastic polymers, wherein said polarizer has a total reflectivity of greater than about 70% for a first polarization of light and a total transmission of greater than about 70% for a second polarization of light orthogonal to said first polarization.
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28. A polarizer, comprising:
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an open-celled polymeric first phase; and
a second phase, disposed within the cells of said first phase;
wherein said first phase has a larger birefringence than said second phase.
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29. A polarizer, comprising:
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an open-celled polymeric first phase; and
a second phase, disposed within the cells of said first phase;
wherein said first and second phases taken together have a diffuse reflectivity along at least one axis for at least one polarization of visible light of at least about 30%. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37)
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38. A polarizer, comprising:
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an open-celled polymeric first phase; and
a second phase, disposed within the cells of said first phase;
wherein said first and second phases comprise diverse thermoplastic polymers. - View Dependent Claims (39, 40, 41, 42, 43, 44)
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Specification