IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
|
출원번호 |
US-0364940
(2003-02-12)
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발명자
/ 주소 |
- Allen,Richard C.
- Johnson,Matthew B.
- Roska,Fred J.
- Rhyner,Steven J.
- Merrill,William W.
- Strobel,Joan M.
- Hamer,Kevin M.
- Klaeser,John M.
- Zehentmaier,Sebastian F.
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출원인 / 주소 |
- 3M Innovative Properties Company
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인용정보 |
피인용 횟수 :
5 인용 특허 :
78 |
초록
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A process for making an optical film includes stretching a polyolefin film in a first direction and stretching the polyolefin film in a second direction different than the first direction forming a biaxially stretched polyolefin film. At least a portion of the stretching of the polyolefin film in th
A process for making an optical film includes stretching a polyolefin film in a first direction and stretching the polyolefin film in a second direction different than the first direction forming a biaxially stretched polyolefin film. At least a portion of the stretching of the polyolefin film in the second direction occurs simultaneous with the stretching of the polyolefin film in the first direction. The biaxially stretched polyolefin film has a length and a width and substantially non-absorbing and non-scattering for at least one polarization state of visible light. The biaxially stretched polyolefin film has x, y, and z orthogonal indices of refraction where at least two of the orthogonal indices of refraction are not equal, an in-plane retardance being 100 nm or less and an out-of-plane retardance being 50 nm or greater.
대표청구항
▼
We claim: 1. A process for making an optical film comprising: a) providing polymeric film comprising a crystallization modifier; a) stretching the polymeric film in a first direction; and b) stretching the polymeric film in a second direction different than the first direction forming a biaxially s
We claim: 1. A process for making an optical film comprising: a) providing polymeric film comprising a crystallization modifier; a) stretching the polymeric film in a first direction; and b) stretching the polymeric film in a second direction different than the first direction forming a biaxially stretched polymeric film, wherein at least a portion of the stretching of the polymeric film in the second direction occurs simultaneous with the stretching of the polymeric film in the first direction; wherein the biaxially stretched polymeric film has a length and a width and being substantially non-absorbing and non-scattering for at least one polarization state of visible light; and having x, y, and z orthogonal indices of refraction wherein at least two of the orthogonal indices of refraction are not equal, an in-plane retardance being 100 nm or less and an out-of-plane retardance being 50 nm or greater. 2. The process according to claim 1, wherein the crystallization modifier comprises a nucleating agent or a clarifying agent. 3. The process according to claim 1, wherein the polymeric film further comprises a tackifier. 4. The process according to claim 1, further comprising cooling the entire width of the biaxially stretched polymeric film an effective amount to provide substantial uniformity of the in-plane retardance across the length and width of the biaxially stretched polymeric film. 5. The process according to claim 4, wherein the in-plane retardance changes less than 4 nm/cm along the width and length of the layer of biaxially stretched polymeric film. 6. The process according to claim 1, wherein the biaxially stretched polymeric film length and width is at least 0.65 meter. 7. The process according to claim 1, wherein the stretching in the first direction is not equal to the stretching in the second direction. 8. The process according to claim 1, wherein the stretching in the first direction is up to 50% greater than the stretching in the second direction. 9. The process according to claim 1, wherein the stretching in the second direction is up to 50% greater than the stretching in the first direction. 10. A process for making an optical film comprising: a) providing polymeric film comprising a crystallization modifier; b) stretching the polymeric film in a first direction; and c) stretching the polymeric film in a second direction different than the first direction forming a biaxially stretched polymeric film, wherein at least a portion of the stretching of the polymeric film in the second direction occurs simultaneous with the stretching of the polymeric film in the first direction; wherein the biaxially stretched polymeric film being substantially non-absorbing and non-scattering for at least one polarization state of visible light; and having x, y, and z orthogonal indices of refraction wherein at least two of the orthogonal indices of refraction are not equal, an in-plane retardance being 100 nm or less and an out-of-plane retardance being 50 nm or greater and a length and width of at least 0.65 meter and the in-plane and out-of-plane retardance are substantially uniform across the length and width. 11. The process according to claim 10, wherein the crystallization modifier comprises a clarifying agent or a nucleating agent. 12. The process according to claim 10, wherein the polymeric film further comprises a tackifier. 13. The process according to claim 10, further comprising cooling the entire width of the biaxially stretched polymeric film an effective amount to provide substantial uniformity of the in-plane retardance across the length and width of the biaxially stretched polymeric film. 14. The process according to claim 13, wherein the in-plane retardance changes less than 4 nm/cm along the length and width of the layer of biaxially stretched polymeric film. 15. The process according to claim 10, wherein the stretching in the first direction is not equal to the stretching in the second direction. 16. The process according to claim 10, wherein the stretching in the first direction is up to 50% greater than the stretching in the second direction. 17. The process according to claim 10, wherein the stretching in the second direction is up to 50% greater than the stretching in the first direction. 18. The process according to claim 1 or 10, wherein the polymeric film comprises a polyolefin. 19. A process for making an optical film comprising: a) providing polymeric film comprising a crystallization modifier; b) stretching the polymeric film in a first direction; and c) stretching the polymeric film in a second direction different than the first direction forming a biaxially stretched polymeric film, wherein at least a portion of the stretching of the polymeric film in the second direction occurs simultaneous with the stretching of the polymeric film in the first direction; wherein the biaxially stretched polymeric film has a length and a width and being substantially non-absorbing and non-scattering for at least one polarization state of visible light; and having x, y, and z orthogonal indices of refraction wherein at least two of the orthogonal indices of refraction are not equal, an in-plane retardance being 100 nm or less and an out-of-plane retardance being 50 nm or greater and a thickness of 5 microns to 200 microns. 20. The process according to claim 19, wherein the crystallization modifier comprises a nucleating agent or a clarifying agent. 21. The process according to claim 19, wherein the polymeric film further comprises a tackifier. 22. The process according to claim 19, further comprising cooling the entire width of the biaxially stretched polymeric film an effective amount to provide substantial uniformity of the in-plane retardance across the length and width of the biaxially stretched polymeric film. 23. The process according to claim 19, wherein the in-plane retardance changes less than 4 nm/cm along the width and length of the layer of biaxially stretched polymeric film. 24. The process according to claim 19, wherein the biaxially stretched polymeric film length and width is at least 0.65 meter. 25. The process according to claim 19, wherein the stretching in the first direction is not equal to the stretching in the second direction. 26. The process according to claim 19, wherein the stretching in the first direction is up to 50% greater than the stretching in the second direction. 27. The process according to claim 19, wherein the stretching in the second direction is up to 50% greater than the stretching in the first direction. 28. The process according to claim 19, wherein the polymeric film comprises a polyolefin. 29. The process according for claim 1, wherein the biaxially stretched polymeric film has a thickness of 10 micrometers to 50 micrometers and an out-of-plane retardance being 75 nm or greater. 30. The process according for claim 10, wherein the biaxially stretched polymeric film has a thickness of 10 micrometers to 50 micrometers and an out-of-plane retardance being 75 nm or greater. 31. The process according for claim 19, wherein the biaxially stretched polymeric film has a thickness of 10 micrometers to 50 micrometers and an out-of-plane retardance being 75 nm or greater.
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