US4740328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal composition
Assignee: Casio Computer Co Ltd
•
Filing: 1987-02-04
•
Granted: 1988-04-26
•
Expires: 2007-02-04
Abstract
Abstract A liquid crystal composition contains at a predetermined mixing ratio: a first liquid crystal material of at least one compound represented by general formula (I): ##STR1## (wherein each of R 1 and R 2 is independently an alkyl group having 1 to 5 carbon atoms) and a second liquid crystal material of at least a compound represented by general formula (VII) among compounds represented by general formulas (II) to (VII): ##STR2## (wherein each of R 3 , R 4 , R 5 , R 6 , R 7 , and R 8 is independently an alkyl group having 2 to 7 carbon atoms). The liquid crystal composition may optionally contain at least one compound represented by the following general formula: ##STR3## (wherein each of R 9 and R 10 is independently an alkyl group having 2 to 5 carbon atoms).
Inventors
- 👤 Koh Fujimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:08
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/30; C09K19/3001; C09K19/3066; C09K19/3068; F; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
179 words
A liquid crystal composition comprising: a first liquid crystal material consisting of at least one compound selected from those represented by general formula (I): ##STR51## (wherein each of R 1 and R 2 is independently an alkyl group having 1 to 5 carbon atoms); and a second liquid crystal material consisting of at least one compound represented by general formula (VII) among compounds represented by general formulas (II) to (VII): ##STR52## (wherein each of R 3 , R 4 , R 5 , R 6 , R 7 , and R 8 is independently an alkyl group having 2 to 7 carbon atoms), said first liquid crystal material having a content of 45 to 70% by weight and said second liquid crystal material having a content of 30 to 55% by weight, said second liquid crystal material containing 5 to 15% by weight of a compound represented by general formula (VII) said liquid crystal composition having a positive value of dielectric anisotropy in a low-frequency electric field and a negative value of dielectric anisotropy in a high-frequency electric field.
Claim 2
Dependent Claim
179 words
A liquid crystal composition comprising: a first liquid crystal material consisting of at least one compound selected from those represented by general formula (I): ##STR51## (wherein each of R 1 and R 2 is independently an alkyl group having 1 to 5 carbon atoms); and a second liquid crystal material consisting of at least one compound represented by general formula (VII) among compounds represented by general formulas (II) to (VII): ##STR52## (wherein each of R 3 , R 4 , R 5 , R 6 , R 7 , and R 8 is independently an alkyl group having 2 to 7 carbon atoms), said first liquid crystal material having a content of 45 to 70% by weight and said second liquid crystal material having a content of 30 to 55% by weight, said second liquid crystal material containing 5 to 15% by weight of a compound represented by general formula (VII) said liquid crystal composition having a positive value of dielectric anisotropy in a low-frequency electric field and a negative value of dielectric anisotropy in a high-frequency electric field.
Claim 3
Dependent Claim
37 words
A composition according to claim 1, wherein said second liquid crystal material is a mixture containing at least one of the compounds represented by general formulas (V) and (VI), in addition to the compound of formula (VII).
Claim 4
Dependent Claim
45 words
A composition according to claim 2, wherein a total content of at least one compound represented by general formula (V), at least one compound represented by general formula (VI), and at least one compound represented by general formula (VII) is 5 to 40% by weight.
Claim 5
Dependent Claim
40 words
A composition according to claim 1, wherein said second liquid crystal material contains 2 to 20% by weight of the compound represented by general formula (V) and 2 to 15% by weight of said compound represented by general formula (VI).
Claim 6
Dependent Claim
105 words
A composition according to claim 1, wherein said second liquid crystal material contains a mixture of the compounds represented by general formulas (II) and (III) or at least one of the compounds represented by general formulas (V) and (VI), the compound represented by general formula (II) having a content of 5 to 20% by weight, the compound represented by general formula (III) having a content of 5 to 15% by weight, the compound represented by general formula (V) having a content of 2 to 20 % by weight, and the compound represented by general formula (VI) having a content of 2 to 15% by weight.
Claim 7
Dependent Claim
36 words
A composition according to claim 3, wherein a total content of at least one compound represented by general formula (V) and at least one compound represented by general formula (VI) is 5 to 30% by weight.
Claim 8
Dependent Claim
79 words
A composition according to claim 5, wherein said second liquid crystal material contains the compounds represented by general formulas (II) and (III), and further contains 2 to 15% by weight of a third liquid crystal material comprising at least one of compounds represented by the following general formula: ##STR53## (wherein each of R 9 and R 10 is independently an alkyl group having 2 to 5 carbon atoms) with respect to a total content of said liquid crystal composition.
Claim 9
Dependent Claim
28 words
A composition according to claim 7, wherein said second liquid crystal material contains 2 to 15% by weight of at least one compound represented by general formula (IV).
Claim 10
Dependent Claim
61 words
A composition according to claim 1, wherein said second liquid crystal material contains said compounds represented by general formulas (II), (III), and (V) or (VI), the compounds represented by general formulas (II), (III), (V), and (VI) having contents of 5 to 20% by weight, 5 to 15% by weight, 2 to 20% by weight, and 2 to 15% by weight, respectively.
Claim 11
Dependent Claim
23 words
A composition according to claim 9, wherein said second liquid crystal material contains the compounds represented by general formulas (II), (III), and (V).
Claim 12
Dependent Claim
51 words
A composition according to claim 10, further containing a third liquid crystal material consisting of 2 to 15% by weight of at least one compound represented by the following general formula: ##STR54## (wherein each of R 9 and R 10 is independently an alkyl group having 2 to 5 carbon atoms).
Claim 13
Dependent Claim
24 words
A composition according to claim 9, wherein said second liquid crystal material contains said compounds respectively represented by general formulas (II), (III), and (VI).
Claim 14
Dependent Claim
51 words
A composition according to claim 12, further containing a third liquid crystal material consisting of 2 to 15% by weight of at least one compound represented by the following general formula: ##STR55## (wherein each of R 9 and R 10 is independently an alkyl group having 2 to 5 carbon atoms).
Claim 15
Dependent Claim
127 words
A composition according to claim 1, wherein said second liquid crystal material contains at least one compound represented by general formula (II), at least one compound represented by general formula (III), and at least one of the compounds represented by general formulas (V) and (VI), said compounds represented by general formulas (II), (III), (V), and (VI) having contents of 5 to 20% by weight, 5 to 15% by weight, 2 to 20% by weight, and 2 to 15% by weight, respectively; and further containing a third liquid crystal material comprising not more than 15% by weight of at least one compound represented by the following general formula: ##STR56## (wherein each of R 9 and R 10 is independently an alkyl group having 2 to 5 carbon atoms).
Claim 16
Dependent Claim
41 words
A composition according to claim 14, wherein said second liquid crystal material contains at least one compound represented by general formula (II), at least one compound represented by general formula (III), and at least one compound represented by general formula (V).
Claim 17
Dependent Claim
41 words
A composition according to claim 14, wherein said second liquid crystal material contains at least one compound represented by general formula (II), at least one compound represented by general formula (III), and at least one compound represented by general formula (VI).
Claim 18
Dependent Claim
34 words
A composition according to claim 14, wherein R 1 is a propyl group, a butyl group, or a pentyl group, and R 2 is a methyl group, an ethyl group, or a butyl group.
Claim 19
Dependent Claim
44 words
A composition according to claim 14, wherein in the compounds represented by general formulas (V), (VI), and (VII) in said second liquid crystal material, each of R 6 , R 7 , and R 8 is independently a propyl group or a pentyl group.
Claim 20
Dependent Claim
34 words
A composition according to claim 14, wherein R 9 is an ethyl group, a propyl group, or a butyl group, and R 10 is an ethyl group, a propyl group, or a butyl group.
References Cited (Backward Citations)
US4279770A
Cited
JPS5584385A
Cited
US4399298A
Cited
US4387039A
Cited
JPS575782A
Cited
JPS575780A
Cited
US4387038A
Cited
JPS5764645A
Cited
US4566759A
Cited
JPS5783577A
Cited
US4460770A
Cited
US4609256A
Cited
JPS58118886A
Cited
JPS58142966A
Cited
US4559161A
Cited
JPS58142959A
Cited
US4550981A
Cited
EP0107116A1
Cited
US4652089A
Cited
JPS60135479A
Cited
EP0171746A2
Cited
JPS61171790A
Cited
JPS61221286A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-26 | 1991-10-26 | 1992-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-26 | 1995-10-26 | 1996-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-26 | 1999-10-26 | 2000-04-26 | $7700.00 | Window Closed / Lapsed |