CALENDERING PROCESS FOR MAKING AN OPTICAL FILM
First Claim
Patent Images
1. A method of making an optical film, comprising:
- calendering at least one polymeric material; and
stretching the at least one polymeric material along a downweb (MD) direction, thereby creating birefringence in the polymeric material.
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Abstract
A method of making an optical film includes calendering at least one polymeric material and stretching the at least one polymeric material along a downweb (MD) direction, thereby creating birefringence in the polymeric material. A roll of optical film includes an oriented optical film characterized by an effective orientation axis, the oriented optical film including a birefringent polymeric material, the optical film having a width of greater than 0.3 m, a thickness of at least 200 microns and a length a length of at least 10 m, wherein the effective orientation axis is aligned along the length of the optical film.
38 Citations
65 Claims
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1. A method of making an optical film, comprising:
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calendering at least one polymeric material; and stretching the at least one polymeric material along a downweb (MD) direction, thereby creating birefringence in the polymeric material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of making an optical film, comprising:
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providing a first film comprising; calendering at least one polymeric material; and stretching the at least one polymeric material along a downweb (MD) direction, thereby creating birefringence in the polymeric material; and attaching a second film to the first film. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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- 23. A method of processing an optical film, comprising calendering a polymeric material comprising a first polymer and a second polymer, wherein the first polymer develops birefringence and the second polymer is substantially isotropic.
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27. A reflective polarizer made by the process of:
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calendering at least one polymeric material; and stretching the at least one polymeric material along a downweb (MD) direction, thereby creating birefringence in the polymeric material.
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- 28. A roll of optical film comprising an oriented optical film characterized by an effective orientation axis, the oriented optical film comprising only one birefringent polymeric material, the optical film having a width of greater than 0.3 m, a thickness of at least 200 microns and a length a length of at least 10 m, wherein the effective orientation axis is aligned along the length of the optical film.
- 39. A roll of optical film comprising an oriented optical film, the oriented optical film comprising a first birefringent material characterized by an effective orientation axis and a second birefringent material characterized by an effective orientation axis, wherein the optical film has a width of greater than 0.3 m, a thickness of at least 200 microns and a length of at least about 10 m and the effective orientation axes of the first and second birefringent materials are aligned along the length of the optical film.
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50. A roll of optical film comprising an absorbing polarizer characterized by an absorbing polarizer block axis and a reflective polarizer characterized by a reflective polarizer block axis, the reflective polarizer comprising (i) at least one birefringent material characterized by an effective orientation axis and at least one isotropic material or (ii) a first birefringent material characterized by an effective orientation axis and a second birefringent material characterized by an effective orientation axis;
wherein the optical film has a width of greater than about 0.3 m, a thickness of at least 200 microns and a length of at least about 10 m, and the absorbing polarizer block axis, the effective orientation axes of the one or more birefringent materials and the reflective polarizer block axis are all aligned along the length of the optical film. - View Dependent Claims (51, 52, 53, 54, 55, 56, 57, 58, 59, 60)
- 61. A method of processing an optical film, comprising calendering a polymeric material comprising a first polymer, a second polymer, and a third polymer, wherein at least one of the polymers develops birefringence.
Specification