Fluorinated xanthenes and use thereof in liquid-crystal...

Stock material or miscellaneous articles – Liquid crystal optical display having layer of specified...

Reexamination Certificate

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C252S299610, C252S299620, C549S223000, C549S385000, C570S142000, C570S183000, C570S187000

Reexamination Certificate

active

11098084

ABSTRACT:
Concerning the compound of the formula (I)R1, R3are each independently, for example, HR2, R4are each independently, for example, HX1, X2are each independently H or FM1is —CO—O—, —O—CO—, —CH2—O—, —O—CH2—, —CF2—O—, —O—CF2—, —CH═CH—, —CF═CF—, —C≡C—, —CH2—CH2—CO—O—, —O—CO—CH2—CH2—, —CH2—CH2—, —CF2—CF2—, —(CH2)4—, —OC(═O)CF═CF— or a single bondA1is, for example, 1,4-phenylene, andR5has the same possible definitions as specified for R2and R4, with the exception of —M1-A1-R5, but independently of the particular definitions of R2and R4with the following provisos:1) at least one of X1, X2has to be F2) R1, R2, R3and R4must not at the same time be H3) at most two of R1, R2, R3and R4may be c).

REFERENCES:
patent: 6558758 (2003-05-01), Yanai et al.
patent: 100 50 071 (2001-06-01), None
CAPLUS 1975: 479029.
CAPLUS 1981: 47140.
Ichinose et al, High Optical Anisotropy and Small Rotational Viscosity LC Mixture for Field-Sequential Color TN-LCD's, Abstract LCT4-3, 2000, pp. 77 to 80; Seventh International Display Workshop, Nov. 29-Dec. 1, 2000, Kobe, Japan.

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