Patent US4959325A successfully refreshed from Google Patents.
EP0176039A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Liquid crystal composition
Assignee: Casio Computer Co Ltd
•
Filing: 1985-09-19
•
Granted: —
•
Expires: 2005-09-19
Abstract
Abstract A liquid crystal composition includes three types of liquid crystal materials. The first liquid crystal material serves to impart Np-type liquid crystal characteristics, and has a large Δε, a low viscosity and a large Δn. The second liquid crystal material serves to reduce the response time. and has a low viscosity and a small Δε. The third liquid crystal material serves to impart steep gamma characteristics and to increase the N-I point, and has a large Δn, a high N-1 point and a low viscosity. These three liquid crystal materials are mixed such that the resultant composition has a positive dielectric anisotropy.
Inventors
- 👤 Isamu Shinoda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 14:01
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/42; C09K19/44
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
185 words
A liquid crystal composition comprising: at least one first liquid crystal material selected from the group consisting of liquid crystal compounds represented by general formulas: (characterized in that each of R l , R 2 and R 3 is independently a normal alkyl group having 2 to 7 carbon atoms); at least one second liquid crystal material selected from the group consisting of liquid crystal compounds represented by general formulas: (characterized in that each of R 4 , R 5 , R 6 , R 7 , R 8 and R 9 is independently a normal alkyl group having 1 to 5 carbon atoms): and at least one third liquid crystal material selected from the group consisting of liquid crystal compounds represented by general formulas: (characterized in that each of R 10 , R 11 , R 12 , R 13 , R 14, R 15 and R 16 is independently a normal alkyl group having 1 to 5 carbon atoms), the first to third liquid crystal materials being mixed in a mixing ratio so as to provide a positive dielectric anisotropy for the composition.
Claim 2
Dependent Claim
185 words
A liquid crystal composition comprising: at least one first liquid crystal material selected from the group consisting of liquid crystal compounds represented by general formulas: (characterized in that each of R l , R 2 and R 3 is independently a normal alkyl group having 2 to 7 carbon atoms); at least one second liquid crystal material selected from the group consisting of liquid crystal compounds represented by general formulas: (characterized in that each of R 4 , R 5 , R 6 , R 7 , R 8 and R 9 is independently a normal alkyl group having 1 to 5 carbon atoms): and at least one third liquid crystal material selected from the group consisting of liquid crystal compounds represented by general formulas: (characterized in that each of R 10 , R 11 , R 12 , R 13 , R 14, R 15 and R 16 is independently a normal alkyl group having 1 to 5 carbon atoms), the first to third liquid crystal materials being mixed in a mixing ratio so as to provide a positive dielectric anisotropy for the composition.
Claim 3
Dependent Claim
54 words
A composition according to claim 1, characterized in that the composition contains 15 to 70% by weight of the first liquid crystal material, 10 to 40% by weight of the second liquid crystal material and 10 to 40% by weight of the third liquid crystal material, based on the total weight of the composition.
Claim 4
Dependent Claim
145 words
A composition according to claim 2, characterized in that the composition contains up to 25% by weight of a liquid crystal compound represented by general formula (I), up to 30% by weight of a compound represented by general formula (II), up to 15% by weight of a compound represented by general formula (III), up to 20% by weight of a compound represented by general formula (IV), up to 10% by weight of a compound represented by general formula (V), up to 30% by weight of a compound represented by general formula (VI), up to 30% by weight of a compound represented by general formula (VII), up to 10% by weight of a compound represented by general formula (VIII), up to 10% by weight of a compound represented by general formula (IX), and up to 15% by weight of a compound represented by general formula (X).
Claim 5
Dependent Claim
50 words
A composition according to claim 2, characterized in that the first liquid crystal material contains compounds represented by general formulas (I) and (II), the second liquid crystal material contains a compound represented by general formula (IV), and the third liquid crystal material contains a compound represented by general formula (VII).
Claim 6
Dependent Claim
61 words
A composition according to claim 4, characterized in that the composition contains up to 20% by weight of the compound of general formula (I), up to 30% by weight of the compound of general formula (II), up to .,20% by weight of the compound of general formula (IV), and up to 30% by weight of the compound of general formula (VII).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.