US4014811A
Expired / Lapsed
US
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Nematic liquid crystal compositions
Assignee: Dai Nippon Toryo Co Ltd
•
Filing: 1975-06-06
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Granted: 1977-03-29
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Expires: 1995-06-06
Abstract
Abstract Nematic liquid crystal compositions having positive dielectric anisotropy are obtained by mixing at least one of p-n-alkylphenyl-p'-cyanobenzoates represented by the formula, ##STR1## wherein R 2 is n-alkyl group of 3 to 8 carbon atoms with at least one of p-cyanophenyl-p'-n-alkylbenzoates represented by the formula, ##STR2## wherein R 1 is n-alkyl group of 4 to 8 carbon atoms. Said compositions exhibit nematic liquid crystal phase over a broad temperature range and therefore, are useful for the torsion effect-type display device.
Inventors
- 👤 Kazuo Totani
- 👤 Goro Matsumoto
- 👤 Kazuhito Iwasaki
- 👤 Toshio Jinnai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:59
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
63 words
A nematic liquid crystal composition consisting essentially of (A) a mixture in equal parts by weight of p-cyanophenyl-p'-n-butylbenzoate, p-cyanophenyl-p'-n-hexylbenzoate and p-cyanophenyl-p'-n-octylbenzoate and (B) at least one of p-n-alkylphenyl-p'-cyanobenzoates selected from the group consisting of p-n-butylphenyl-p'-cyanobenzoate, p-n-hexylphenyl-p'-cyanobenzoate and p-n-octylphenyl-p'-cyanobenzoate ##STR63## said component B being present in an amount of not more than about 30% by weight based on the total amount of the composition.
Claim 2
Dependent Claim
63 words
A nematic liquid crystal composition consisting essentially of (A) a mixture in equal parts by weight of p-cyanophenyl-p'-n-butylbenzoate, p-cyanophenyl-p'-n-hexylbenzoate and p-cyanophenyl-p'-n-octylbenzoate and (B) at least one of p-n-alkylphenyl-p'-cyanobenzoates selected from the group consisting of p-n-butylphenyl-p'-cyanobenzoate, p-n-hexylphenyl-p'-cyanobenzoate and p-n-octylphenyl-p'-cyanobenzoate ##STR63## said component B being present in an amount of not more than about 30% by weight based on the total amount of the composition.
Claim 3
Dependent Claim
25 words
The Nematic liquid crystal composition of claim 1 wherein said amount of component B is within the range of about 10% to 25% by weight.
Claim 4
Dependent Claim
14 words
The Nematic liquid crystal composition of claim 2 wherein said component B is p-n-butylphenyl-p'-cyanobenzoate.
Claim 5
Dependent Claim
14 words
The Nematic liquid crystal composition of claim 2 wherein said component B is p-n-hexylphenyl-p'-cyanobenzoate.
Claim 6
Dependent Claim
14 words
The Nematic liquid crystal composition of claim 2 wherein said component B is p-n-octylphenyl-p'cyanobenzoate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-28 | 1980-09-27 | 1981-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-28 | 1984-09-27 | 1985-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-28 | 1988-09-27 | 1989-03-29 | $7700.00 | Window Closed / Lapsed |