US4454057A
Expired / Lapsed
US
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Liquid crystal composition
Assignee: Mitsubishi Chemical Corp
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Filing: 1982-06-28
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Granted: 1984-06-12
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Expires: 2002-06-28
Abstract
Abstract A liquid crystal composition comprising a host liquid crystal and at least one perylene dye dissolved therein represented by the formula: <IMAGE> wherein X represents an oxygen atom or a sulfur atom, R1 and R2 each represents an aryl group when X represents an oxygen atom; or an aryl group or an alkyl group containing 1 to 18 carbon atoms when X represents a sulfur atom.
Inventors
- 👤 Masaharu Kaneko
- 👤 Tetsuo Ozawa
- 👤 Tomio Yoneyama
- 👤 Shuji Imazeki
- 👤 Akio Mukoh
- 👤 Mikio Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:55
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/60; C09B; C09B3/00; C09B3/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
A liquid crystal composition comprising a host nematic, cholesteric or smectic liquid crystal and at least one perylene dye dissolved therein represented by the formula: ##STR69## wherein R 1 and R 2 each represents an aryl group selected from the group consisting of a phenyl group, a substituted phenyl group, an α-naphthyl group, a substituted α-naphthyl group, a β-naphthyl group, and a substituted β-naphthyl group, or an alkyl group containing 1 to 18 carbon atoms, each of said substituted groups being substituted by at least one alkyl group, alkoxyalkyl group, cycloalkyl group, alkoxy group, aryl group, aralkyloxy group, ester group, acyloxy group or a halogen atom.
Claim 2
Dependent Claim
106 words
A liquid crystal composition comprising a host nematic, cholesteric or smectic liquid crystal and at least one perylene dye dissolved therein represented by the formula: ##STR69## wherein R 1 and R 2 each represents an aryl group selected from the group consisting of a phenyl group, a substituted phenyl group, an α-naphthyl group, a substituted α-naphthyl group, a β-naphthyl group, and a substituted β-naphthyl group, or an alkyl group containing 1 to 18 carbon atoms, each of said substituted groups being substituted by at least one alkyl group, alkoxyalkyl group, cycloalkyl group, alkoxy group, aryl group, aralkyloxy group, ester group, acyloxy group or a halogen atom.
Claim 3
Dependent Claim
34 words
A liquid crystal composition as claimed in claim 1, wherein said perylene dye is dissolved in the host liquid crystal in an amount such that the fluorescence of the dye can be recognized visually.
Claim 4
Dependent Claim
23 words
A liquid crystal composition as claimed in claim 1 or 2, wherein said perylene dye is the dye represented by the formula: ##STR70##
Claim 5
Dependent Claim
23 words
A liquid crystal composition as claimed in claim 1 or 2, wherein said perylene dye is the dye represented by the formula: ##STR71##
Claim 6
Dependent Claim
54 words
A liquid crystal composition as claimed in claim 1, wherein said host liquid crystal is a nematic liquid crystal which takes a cholesteric state by containing an optically active substance selected from the group consisting of chiral nematic compounds, alcohol derivatives, ketone derivatives, carboxylic acid derivatives, aldehyde derivatives, alkene derivatives, amines, amides and nitriles.
References Cited (Backward Citations)
JPS5448572A
Cited
JPS5448571A
Cited
US4211473A
Cited
DE2851513A1
Cited
EP0026004A1
Cited
DE3038372A1
Cited
EP0047027A1
Cited
WO1982001191A1
Cited
US4378302A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |