US4738811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing cholesteric liquid crystal polyester film or sheet possessing ordered planar texture
Assignee: Eneos Corp
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Filing: 1986-09-19
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Granted: 1988-04-19
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Expires: 2006-09-19
Abstract
Abstract A process for producing a cholesteric liquid crystal polyester film or sheet possessing an ordered planar texture (monodomain structure), which process comprises providing a cholesteric liquid crystal polyester in which 1 to 10 mol % of constituent monomer units are optically active, allowing the cholesteric liquid crystal polyester to be formed in the temperature range of 150 DEG to 350 DEG into a film or sheet having a thickness not larger than 100 mu m, and then cooling the film or sheet rapidly.
Inventors
- 👤 Hajime Hara
- 👤 Shingo Orii
- 👤 Tetsuo Satoh
- 👤 Tomohiro Toya
- 👤 Shigeki Iida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:16
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29C; B29C48/00; B29C48/022; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3804; C09K19/3809; C09K19/52; C09K19/58; C09K19/586; B29C48/03; B29C48/07; B29C48/08; B29K; B29K2105/00; B29K2105/0079; C08J2367/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
A process for producing a cholesteric liquid crystal polyester film or sheet possessing an ordered plannar texture (monodomain structure), which process comprises providing a cholesteric liquid crystal polyester in which 1 to 10 mol% of constituent monomer units are optically active, allowing the cholesteric liquid crystal polyester to be formed in the temperature range of 150° to 350° C. into a film or sheet having a thickness not larger than 100 um, and then cooling the film or sheet rapidly, said cholesteric liquid crystal polyester comprising (A) two or more structural units selected from (a) a structural unit derived from an aromatic diol, (b) a structural unit derived from an aromatic dicarboxylic acid or a cyclohexanedicarboxylic acid and (c) a structural unit derived from an aromatic hydroxycarboxylic acid and (B) an optically active component.
Claim 2
Dependent Claim
134 words
A process for producing a cholesteric liquid crystal polyester film or sheet possessing an ordered plannar texture (monodomain structure), which process comprises providing a cholesteric liquid crystal polyester in which 1 to 10 mol% of constituent monomer units are optically active, allowing the cholesteric liquid crystal polyester to be formed in the temperature range of 150° to 350° C. into a film or sheet having a thickness not larger than 100 um, and then cooling the film or sheet rapidly, said cholesteric liquid crystal polyester comprising (A) two or more structural units selected from (a) a structural unit derived from an aromatic diol, (b) a structural unit derived from an aromatic dicarboxylic acid or a cyclohexanedicarboxylic acid and (c) a structural unit derived from an aromatic hydroxycarboxylic acid and (B) an optically active component.
Claim 3
Dependent Claim
20 words
A process as set forth in claim 1, wherein said processing is carried out by extrusion, injection molding, or pressing.
Claim 4
Dependent Claim
55 words
A process as set forth in claim 1, wherein said cholesteric liquid crystal polyester is formed into the film or sheet at a temperature in the range of 150° to 350° C. and said temperature range is maintained for a period of time sufficient to transform polydomain structure into monodomain structure, followed by cooling rapidly.
Claim 5
Dependent Claim
28 words
A process as claimed in claim 1, wherein the optically active component is a monomer selected from 3-methyladipic acid, benzoylglutamic acid, 1,2-propanediol, 2-methyl-1,4-butanediol, 3-hydroxybutanoic acid and 2-methyl-3-hydroxypropionic acid.
Claim 6
Dependent Claim
30 words
A process as claimed in claim 1 or claim 4, wherein the difference in content between (R) and (S) isomers of the optically active component is not less than 15%.
References Cited (Backward Citations)
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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) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |