公开(公告)号：DE2338281A1

公开(公告)日：1974-02-21

申请号：DE2338281

申请日：1973-07-27

Applicant: IBM

Inventor： MILLER ROBERT D ,  YOUNG WILLIAM R ,  AVIRAM ARIEH ,  HALLER IVAN

IPC: C07D323/00 ,  C07F9/11 ,  C09K19/58 ,  G02F1/137 ,  B01D9/00

Abstract: 1395678 Liquid crystal compositions INTERNATIONAL BUSINESS MACHINES CORP 4 July 1973 [3 Aug 1972] 31854/73 Heading C4X [Also in Division C2] To a nematic liquid crystal material is added an organic dopant which provides ions in which the charge is effectively distributed over several atoms and is shielded from the charge of the counterions by a non-poar shell, whereby the resistivity of the nematic material is reduced, and as described in relation to dynamic scattering materials, the threshold voltage is reduced and the cut-off frequency raised. In some cases the undoped material does not exhibit dynamic scattering. The dopant, preferably forming 0À01 to 5% by weight of the composition, may contain large organic ions, or be a precursor thereof, or may be a compound containing chelated alkali metal ions. In the latter class the chelating agent may be dicyclohexyl-18-crown- 6 ether such being reacted with any one of a number of alkali metal salts of organic anions, or the dibenzo-18-crown-6 ether analogues. The former class appears to consist of generally unrelated materials, e.g. hexaphenylethane; tetrabutylammonium tetraphenylforide; and quinhydrone. The dopant may also be tributylphosphine oxide lithium bromide or triphenylphosphine oxide lithium bromide.

公开(公告)号：CA1027963A

公开(公告)日：1978-03-14

申请号：CA182854

申请日：1973-10-09

Applicant: IBM

Inventor： GREEN DENNIS C ,  YOUNG WILLIAM R

IPC: C07C37/00 ,  C07C49/825 ,  C09K19/20 ,  G02F1/13

公开(公告)号：CA1000943A

公开(公告)日：1976-12-07

申请号：CA130920

申请日：1971-12-23

Applicant: IBM

Inventor： AVIRAM ARIEH ,  COX ROBERT J ,  YOUNG WILLIAM R

IPC: C09K19/16

Abstract: A new class of stable trans-stilbene compounds, some displaying nematic mesophases at or near room temperature and others in a range up to 100 DEG C., are useful in liquid crystal display devices. Exemplary compounds are 4-butoxy, 4'-n-butyl- beta -chloro trans-stilbene, having a nematic range of 30 DEG -52 DEG C., 4-ethoxy, 4'-n-butyl- beta -chloro trans-stilbene, having a nematic range of 29 DEG -58 DEG C., and 4-ethoxy, 4'-(2-methylbutyl)- beta -chloro trans-stilbene, having a nematic range of 29 DEG -34 DEG C.; a mixture containing 60 mole-% 4-ethoxy, 4'-n-butyl- beta -chloro trans-stilbene and 40 mole-% 4-ethoxy-4'-n-octyl- beta -chloro trans-stilbene has a nematic range of 8 DEG -59 DEG C.