Liquid crystal compound having chroman ring, liquid crystal...

Details Liquid crystal compound having chroman ring, liquid crystal... Liquid crystal compound having chroman ring, liquid crystal...

2007-07-24

2007-07-24

Wu, Shean C (Department: 1756)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

C252S299610, C252S299620, C549S398000, C549S399000, C549S406000, C549S408000

Reexamination Certificate

active

11304661

ABSTRACT:
The present invention relates to a compound having a chroman ring, which has good thermal and optical stability, adequate optical anisotropy, adequate dielectric anisotropy and superior compatibility with other liquid crystal compounds, a liquid crystal composition comprising the compound, and a liquid crystal device comprising the composition.A compound represented by formula (1) below is provided:where Rais hydrogen or C1-C20alkyl; Rbis halogen, —CN, alkyl (at least one hydrogen of which is replaced by halogen), alkenyl (at least one hydrogen of which may be replaced by halogen), or alkoxy (at least one hydrogen of which may be replaced by halogen); each of A1, A2, A3and A4is independently 1,4-cyclohexylene, 1,4-cyclohexenylene or 1,4-phenylene, in which any —CH2— may be replaced by —O— or —S—, any —CH═ may be replaced by —N═ and any hydrogen may be replaced by halogen, methyl or —CF3; each of Z1, Z2, Z3and Z4is independently a single bond or C1-C4alkylene; each of h, k, m and n is independently 0, 1 or 2, the sum of h, k, m and n being 1, 2 or 3; and Q is one of the group represented by formulas (q1), (q2) and (q3) below:where X1is hydrogen, halogen, methyl, ethyl, methoxy, ethoxy, —CF3, —CF2H, —CFH2, —OCF3, —OCF2H, or —OCFH2; and each of Y1, Y2, Y3, Y4and Y5is independently hydrogen, halogen or methyl.

REFERENCES:
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Patent Abstracts of Japan vol. 017, No. 309 (C-1070), Jun. 14, 1993 & JP 05 025158 A (Kanto Chem Co Inc), Feb. 2, 1993 * abstract; compound I * *p. 5; compound 30 * * p. 6; compound 40 * * p. 14; compound 80, 82 * * p. 16; compounds 90, 91 *.
Patent Abstracts of Japan vol. 018, No. 656 (C-1286), Dec. 13, 1994 & JP 06 256337 A (Dainippom Ink & Chem Inc), Sep. 13, 1994 * abstract * * p. 6, paragraph 45; figure 14; compounds IB-2 *.
Takehara, S. et al.: “New Chiral Dopants For FLC Materials: Optically Active Cyclic Ethers” Ferroelectrics, Overseas Publishers Associations, Amsterdam, NL, vol. 148, No. 1-4, 1993, pp. 195-202, XP008034869 ISSN: 0015-0193.

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