Method of increasing helical twisting power, optically...

Details Method of increasing helical twisting power, optically... Method of increasing helical twisting power, optically...

2006-09-19

2006-09-19

Wu, Shean C. (Department: 1756)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

C252S299010, C252S299700, C560S055000, C560S064000, C560S065000, C560S076000, C560S083000, C560S127000, C560S128000

Reexamination Certificate

active

07108896

ABSTRACT:
A method of increasing helical twisting power (HTP) in an optically active compound used in a liquid crystal material is provided. An optically active compound which exhibits a large HTP value is also provided. Furthermore, a liquid crystal composition which exhibits a high upper temperature limit of the liquid crystal after the addition of the optically active compound, and a liquid crystal display device using the same are provided. In a method, an HTP of a compound having a partial structure represented by formula (A), which has an asymmetric carbon atom, is increased by replacing the partial structure represented by formula (A) by a partial structure represented by formula (B)(wherein * represents the position of an asymmetric carbon atom, Y1represents a substituent such as an alkyl group and a halogen).A compound is represented by formula (I):

REFERENCES:
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CAPLUS 1969 438186.
CAPLUS 1991: 229195.
CAPLUS 1992: 20960.
Masaki Oiwa, et al., Preliminary Manuscript of the 2001 Conference of the Japanese Liquid Crystal Society, 2001, pp. 421-422.
Takeshi Koike, et al., Preliminary Manuscript of the 1999 Conference of the Japanese Liquid Crystal Society, 1990, pp. 220-221.
Chinese Office Action dated Apr. 28, 2006, in counterpart application.

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