Trifluorobenzene derivative and liquid crystal composition containing the same

• US 5,032,313 A
• Filed: 03/07/1990
• Issued: 07/16/1991
• Est. Priority Date: 03/07/1989
• Status: Expired due to Term

• Current Assignee: Chisso Corporation
• Original Assignee: Chisso Corporation
• Inventors: Goto, Yasuyuki, Kitano, Kisei
• Primary Examiner(s): Maples, John S.
• Assistant Examiner(s): Treanor, Richard
• Application Number:
  US07/490,706
• Time in Patent Office: 496 Days
• Field of Search: 252/299.6, 252/299.63, 252/299.66, 570/123, 570/129, 570/131, 570/124
• US Class Current: 252/299.63
• CPC Class Codes: C07D 239/26 with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
• CPC Class Codes: C07D 317/16 Radicals substituted by halogen atoms or nitro radicals
• CPC Class Codes: C09K 19/12 at least two benzene rings directly linked, e.g. biphenyls
• CPC Class Codes: C09K 19/3003 Compounds containing at least two rings in which the different rings are directly linked (covalent bond)
• CPC Class Codes: C09K 19/3028 in which at least two rings are linked by a carbon chain containing carbon to carbon single bonds
• CPC Class Codes: C09K 19/3068 chain containing -COO- or -OCO- groups
• CPC Class Codes: C09K 19/3402 having oxygen as hetero atom sugars C09K19/0422
• CPC Class Codes: C09K 19/3458 Uncondensed pyrimidines
• CPC Class Codes: C09K 2019/3422 the heterocyclic ring being a six-membered ring

Abstract

A trifluorobenzene derivative having a superior stability and a large positive dielectric anisotropy value and a liquid crystal composition containing the derivative are provided, which derivative is expressed by the formula ##STR1## wherein R is 1-10C alkyl and one --CH₂ -- group or two not-adjacent --CH₂ -- groups in the alkyl may be replaced by O and/or --CO-- and/or --COO-- and/or --CH═CH--, --A-- and --B-- are 1,4-cyclohexylene, 1,4-phenylene, pyrimidine-2,5-diyl or 1,3-dioxane-2,5-diyl, l and m each are 0, 1 or 2 and l+m≧1, and Z¹ and Z² each are --COO--, --OCO--, --CH₂ CH₂ --, --OCH₂ --, --CH₂ O--, --CH═CH-- or single bond and may be same or different.

Claims

1. A trifluorobenzene derivative expressed by the formula ##STR14## wherein R represents an alkyl group of 1 to 10 carbon atoms, --A-- and --B-- each represent 1,4-cyclohexylene or 1,4-phenylene, l represents 1 or 2, m represents 0, 1 or 2 and l+m≦

3, and Z¹ and Z² each represent --CH₂ CH₂ -- or a single bond, and when m is 0, Z² is a single bond.

2. A trifluorobenzene derivative according to claim 1, expressed by the formula ##STR15##

3. A trifluorobenzene derivative according to claim 1, expressed by the formula ##STR16##

4. A trifluorobenzene derivative according to claim 1, expressed by the formula ##STR17##

5. A trifluorobenzene derivative according to claim 1, expressed by the formula ##STR18##

6. A trifluorobenzene derivative according to claim 1, expressed by the formula ##STR19##

7. A trifluorobenzene derivative according to claim 1, expressed by the formula ##STR20##

8. A trifluorobenzene derivative according to claim 1, expressed by the formula ##STR21##

9. A trifluorobenzene derivative according to claim 1, expressed by the formula ##STR22##

10. A liquid crystal composition comprising at least two components at least one of which is a trifluorobenzene derivative as set forth in claim 1, the content of which derivative is in the range of 2 to 40% by weight based on the weight of said composition.