US4132464A
Expired / Lapsed
US
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Liquid crystal device
Assignee: Affinity Co Ltd
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Filing: 1978-02-21
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Granted: 1979-01-02
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Expires: 1998-02-21
Abstract
Abstract Provided is a liquid crystal device comprising a lyotropic-type cholesteric liquid crystal and an enclosure surrounding the liquid crystal, at least a part of which enclosure is transparent, so that the color of the liquid crystal, varying depending upon the change of temperature, is viewable therethrough. The liquid crystal is a concentrated solution having a concentration of approximately 50 to 85 wt.% of a cellulose derivative in water or an organic solvent. The cellulose derivative has an average polymerization degree of 30 to 600 and a chemical structure such that the -OH groups in the cellulose molecule are at least partially substituted with at least one radical of the following formula to the extent that the mole number (M.S.) of a hydroxyalkylating agent bonded with cellulose, per anhydro glucose unit of the cellulose molecule, is 2.0 to 10.0 at average:
Inventors
- 👤 Jun Maeno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:16
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3804; C09K19/3819; G; G01; G01K; G01K11/00; G01K11/12; G01K11/16; G01K11/165; G02; G02F; G02F1/00; G02F1/0009; G02F1/0045; C09K2323/00; C09K2323/05
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
272 words
Liquid crystal device comprising a lyotropic-type cholesteric liquid crystal and an enclosure surrounding said liquid crystal, at least a part of which enclosure is transparent so that a color change of said liquid crystal is viewable, CHARACTERIZED IN THAT said liquid crystal is a concentrated solution having a concentration of approximately 50 to 85% by weight, based on the weight of said liquid crystal, of a cellulose derivative in water or an organic solvent; said cellulose derivative having an average polymerization degree of 30 to 600 and having a chemical structure such that the hydroxyl groups in the cellulose molecule are at least partially substituted with at least one radical, expressed by the following formula, to the extent that the mole number (M.S.) of a hydroxyalkylating agent bonded with cellulose, per anhydro glucose unit of the cellulose molecule is 2.0 to 10.0 at average, -- O -- X -- CHR.sub.1 -- CHR.sub.2 -- O].sub.m H where X is direct bond or --CO--; and, when X is direct bond, R 1 is H or --CH 3 , and R 2 is a radical selected from --CH 3 , C 2 H 5 , --CH 2 A 1 (A 1 is a radical selected from --OH, halogen, --OCH 3 and --OC 2 H 5 ) and --CHA 2 --CH 2 A 3 (each of A 2 and A 3 is selected from H, --OH and halogen or both A 2 and A 3 form a double bond together); and when X is --CO--, R 1 is H and R 2 is --CH 3 ; and m is an integer determined depending upon the M.S.
Claim 2
Dependent Claim
272 words
Liquid crystal device comprising a lyotropic-type cholesteric liquid crystal and an enclosure surrounding said liquid crystal, at least a part of which enclosure is transparent so that a color change of said liquid crystal is viewable, CHARACTERIZED IN THAT said liquid crystal is a concentrated solution having a concentration of approximately 50 to 85% by weight, based on the weight of said liquid crystal, of a cellulose derivative in water or an organic solvent; said cellulose derivative having an average polymerization degree of 30 to 600 and having a chemical structure such that the hydroxyl groups in the cellulose molecule are at least partially substituted with at least one radical, expressed by the following formula, to the extent that the mole number (M.S.) of a hydroxyalkylating agent bonded with cellulose, per anhydro glucose unit of the cellulose molecule is 2.0 to 10.0 at average, -- O -- X -- CHR.sub.1 -- CHR.sub.2 -- O].sub.m H where X is direct bond or --CO--; and, when X is direct bond, R 1 is H or --CH 3 , and R 2 is a radical selected from --CH 3 , C 2 H 5 , --CH 2 A 1 (A 1 is a radical selected from --OH, halogen, --OCH 3 and --OC 2 H 5 ) and --CHA 2 --CH 2 A 3 (each of A 2 and A 3 is selected from H, --OH and halogen or both A 2 and A 3 form a double bond together); and when X is --CO--, R 1 is H and R 2 is --CH 3 ; and m is an integer determined depending upon the M.S.
Claim 3
Dependent Claim
22 words
Liquid crystal device according to claim 1 wherein said cellulose derivative is a β-hydroxypropyl cellulose (Cell--O--CH 2 --CH(CH 3 )--O] m H).
Claim 4
Dependent Claim
23 words
Liquid crystal device according to claim 1 wherein said cellulose derivative is β-hydroxybutyl cellulose (Cell--O--CH 2 --CH(C 2 H 5 )--O] m H).
Claim 5
Dependent Claim
21 words
Liquid crystal device according to claim 1 wherein said cellulose derivative is α-methyl-β-hydroxypropyl cellulose (Cell--O--CH(CH 3 )--CH(CH 3 )--O] m H).
Claim 6
Dependent Claim
20 words
Liquid crystal device according to claim 1 wherein said cellulose derivative is β-hydroxybutenyl cellulose(Cell--O--CH 2 --CH(CH═CH 2 )--O] m H).
Claim 7
Dependent Claim
23 words
Liquid crystal device according to claim 1 wherein said cellulose derivative is β, γ, δ-trihydroxybutyl cellulose (Cell--O--CH 2 --CH(CHOH.CH 2 OH)--O] m H).
Claim 8
Dependent Claim
21 words
Liquid crystal device according to claim 1 wherein said cellulose derivative is β-hydroxy-γ-chlorobutyl cellulose (Cell--O--CH 2 --CH(CHCL.CH 3 )--O] m H).
Claim 9
Dependent Claim
22 words
Liquid crystal device according to claim 1 wherein said cellulose derivative is β, γ-dihydroxy-δ-bromobutyl cellulose (Cell--O--CH 2 --CH(CHOH.CH 2 Br)--O] m H).
Claim 10
Dependent Claim
23 words
Liquid crystal device accoridng to claim 1 wherein said cellulose derivative is β-hydroxy-γ-methoxypropyl cellulose (Cell--O--CH 2 --CH(CH 2 OCH 3 )--O] m H).
Claim 11
Dependent Claim
19 words
Liquid crystal device according to claim 1 wherein said cellulose derivative is β-hydroxybutyryl cellulose (Cell--O--CO--CH(CH 3 )--O] m H).
Claim 12
Dependent Claim
98 words
Liquid crystal device according to claim 1 wherein said organic solvent is at least one solvent selected from the group consisting of methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, iso-butyl alcohol, tert-butyl alcohol, 1,2-ethane-diol, 1,2-propane-diol, 1,3-propane-diol, 1,2-butane-diol, 1,3-butane-diol, 1,4-butane-diol, 2,3-butane-diol, 1,5-pentane-diol, cyclohexanol, 2-methoxyethanol, 2-ethoxyethanol, 2-isopropoxyethanol, 2-phenoxyethanol, tetrahydrofurfuryl alcohol, 1-methoxy-2-propanol, diacetone alcohol, 2-chloroethanol, 1,4-dioxane, tetrahydrofuran, tetrahydropyran, diethylene glycol monomethyl ether, acetone, cyclohexanone, acetonylacetone, formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, lactic acid, methyl formate, ethyl formate, methyl acetate, methyl lactate, γ-butyrolactone, monoacetin, diacetin, ethylene glycol monoacetate, acetonitrile, formamide, N-methylformamide, N,N-dimethylformamide, N,N-diethylformamide, morpholine, N-methylpyrolidone, dimethylsulfoxide, chloroform and 1,2-dichloroethane.
Claim 13
Dependent Claim
41 words
Liquid crystal device according to claim 1 wherein said organic solvent is at least one solvent selected from the group consisting of methanol, ethanol, 1-propanol, 2-propanol, 1,2-ethane-diol, 1,2-propane-diol, 1,3-propane-diol, 2-methoxyethanol, 2-chloroethanol, formic acid, lactic acid, fromamide, N-methylformamide, N,N-dimethylformamide, N-methylpyrolidone, and dimethylsulfoxide.
Claim 14
Dependent Claim
34 words
Liquid crystal device according to claim 1 wherein the liquid crystal is a 50 to 85% by weight solution of β-hydroxypropyl cellulose having an M.S. of 2.0 to 5.0 dissolved in water or methanol.
Claim 15
Dependent Claim
19 words
Liquid crystal device according to claim 1 wherein the M.S. is in the range of from 2.0 to 5.0.
References Cited (Backward Citations)
US3114836A
Cited
US3410999A
Cited
US3529156A
Cited
US3594126A
Cited
US3796884A
Cited
US3697297A
Cited
US3666948A
Cited
US3733485A
Cited
US3861213A
Cited
US3936817A
Cited
US3980300A
Cited
DE2704776A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-01 | 1982-07-03 | 1983-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-01 | 1986-07-03 | 1987-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-01 | 1990-07-03 | 1991-01-02 | $7700.00 | Window Closed / Lapsed |