US4891418A
Expired / Lapsed
US
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Cholesteric liquid crystal polyester
Assignee: Eneos Corp
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Filing: 1988-09-06
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Granted: 1990-01-02
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Expires: 2008-09-06
Abstract
Abstract A cholesteric liquid crystal polyester comprising the following structural units (A), (B) and (C): ##STR1## wherein Ar 1 and Ar 2 represent each independently a divalent aromatic hydrocarbon group having 6 to 20 carbon atoms, of which one or more hydrogen atoms may be substituted by one or more halogen atoms, alkyl or alkoxy groups having 1 to 4 carbon atoms, provided that at least 60 mol % of Ar 1 in the polymer is constituted by at least one group selected from 1,4-phenyl group, 2,6-naphthyl group and 4,4'-biphenyl group.
Inventors
- 👤 Hajime Hara
- 👤 Tomohiro Toya
- 👤 Shigeki Iida
- 👤 Tetsuo Satoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:59
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3804; C09K19/3809
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
101 words
A cholesteric liquid crystal polyester comprising the following structural units (A), (B) and (C): ##STR5## wherein Ar 1 and Ar 2 represent each independently a divalent aromatic hydrocarbon group having 6 to 20 carbon atoms, the aromatic group is unsubstituted or substituted by one or more substituents, selected from a member of the group of halogen atoms, alkyl or alkoxy groups, wherein the alkyl groups has from 1 to 4 carbon atoms, provided that at least 60 mol % of Ar 1 in the polymer is constituted by at least one group selected from 1,4-phenyl group, 2,6-naphthyl group or 4,4'-biphenyl group.
Claim 2
Dependent Claim
101 words
A cholesteric liquid crystal polyester comprising the following structural units (A), (B) and (C): ##STR5## wherein Ar 1 and Ar 2 represent each independently a divalent aromatic hydrocarbon group having 6 to 20 carbon atoms, the aromatic group is unsubstituted or substituted by one or more substituents, selected from a member of the group of halogen atoms, alkyl or alkoxy groups, wherein the alkyl groups has from 1 to 4 carbon atoms, provided that at least 60 mol % of Ar 1 in the polymer is constituted by at least one group selected from 1,4-phenyl group, 2,6-naphthyl group or 4,4'-biphenyl group.
Claim 3
Dependent Claim
59 words
A cholesteric liquid crystal polyester of claim 1 further comprising the following structural unit (D): --0 --Ar.sup.3 --0 wherein wherein Ar 3 represent a divalent aromatic hydrocarbon group having 6 to 20 carbon atoms, of which one or more hydrogen atoms are substituted by one or more halogen atoms, alkyl or alkoxy groups having 1 to 4 carbon atoms.
Claim 4
Dependent Claim
46 words
A cholesteric liquid crystal polyester of claim 1 or 2, containing the structural units (A), (B), (C) and (D) in proportions of 20-80 mol %, 0.1-40 mol %, 5-50 mol % and 0-50 mol %, respectively, based on the total 100 mol % of said (A)-(D).
Claim 5
Dependent Claim
36 words
A cholesteric liquid crystal polyester of claim 2 or 3, in which the structural unit (D) is contained in proportion of 5-50 mol % based on the total 100 mol % of said (A) to (D).
Claim 6
Dependent Claim
22 words
A cholesteric liquid crystal polyester of claim 1, in which Ar 1 , Ar 2 and Ar 3 represent each independently ##STR6##
Claim 7
Dependent Claim
14 words
A cholesteric liquid crystal polyester of claim 1, in which Ar 1 is ##STR7##
Claim 8
Dependent Claim
35 words
A cholesteric liquid crystal polyester of claim 1, in which substantially all of said Ar 1 in the polymer is constituted by one or more groups selected from 1,4-phenylene group, 2,6-naphthyl group or 4,4'-biphenyl group.
Claim 9
Dependent Claim
25 words
A cholesteric liquid crystal polyester of claim 1, in which the structural unit (A) is a combination of 2-hydroxy-6-naphthoic acid unit and p-hydroxybenzoic acid unit.
References Cited (Backward Citations)
US4652626A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-01-01 | 1993-07-03 | 1994-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-01 | 1997-07-03 | 1998-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-01 | 2001-07-03 | 2002-01-02 | $7700.00 | Window Closed / Lapsed |