Freudenberg et al., Chemische Berichte, 1939, vol. 72, p. 217,226
作者:Freudenberg et al.
DOI:——
日期:——
Bartoletti, Antonella; Bartolini, Simona; Germani, Raimondo, Journal of the Chemical Society. Perkin transactions II, 1994, # 4, p. 723 - 728
作者:Bartoletti, Antonella、Bartolini, Simona、Germani, Raimondo、Savelli, Gianfranco、Bunton, Clifford A.
DOI:——
日期:——
Polarizing, photochromic devices and methods of making the same
申请人:Kumar Anil
公开号:US20050012998A1
公开(公告)日:2005-01-20
Various embodiments disclosed herein relate to optical elements comprising an at least partial coating having a first state and a second state connected to at least a portion of a substrate, the at least partial coating being adapted to switch from the first state to the second state in response to at least actinic radiation, to revert back to the first state in response to thermal energy, and to linearly polarize at least transmitted radiation in at least one of the first state and the second state. Other embodiments relate to optical elements comprising a substrate and at least one at least partially aligned photochromic-dichroic compound connected to at least a portion of the substrate and having an average absorption ratio greater than 2.3 in the activated state as determined according to CELL METHOD. Still other embodiments relate to security devices, liquid crystal cells and methods of making the same.
Polirizing, photochromic devices and methods of making the same
申请人:Kumar Anil
公开号:US20070053048A1
公开(公告)日:2007-03-08
An optical element including: a substrate; and an at least partial coating having a first state and a second state on at least a portion of the substrate, the at least partial coating being adapted to be circularly polarizing or elliptically polarizing in at least one state and containing: a chiral nematic or cholesteric liquid crystal material having molecules that are helically arranged through a thickness of the at least partial coating; and at least one photochromic-dichroic compound that is at least partially aligned with the liquid crystal material such that a long axis of a molecule of the photochromic-dichroic compound is generally parallel to the molecules of the liquid crystal material.
PHOTOCHROMIC COMPOUNDS
申请人:Kumar Anil
公开号:US20080045704A1
公开(公告)日:2008-02-21
Various non-limiting embodiments disclosed herein relate generally to photochromic compounds, which may be thermally reversible or non-thermally reversible, and articles made therefrom. Other non-limiting embodiments relate to photochromic-dichroic compounds, which may be thermally reversible or non-thermally reversible, and articles made therefrom. For example, one non-limiting embodiment provides a thermally reversible, photochromic compound adapted to have at least a first state and a second state, wherein the thermally reversible, photochromic compound has an average absorption ratio greater than 2.3 in at least one state as determined according to CELL METHOD. Another non-limiting embodiment provides a photochromic compound comprising: (a) at least one photochromic group chosen from a pyran, an oxazine, and a fulgide; and (b) at least one lengthening agent L attached to the at least one photochromic group and represented by the formula —[S
1
]
c
-[Q
1
-[S
2
]
d
]
d′
-[Q
2
-[S
3
]
e
]
e′
-[Q
3
-[S
4
]
f
]
f′
—S
5
—P, which is described herein.