US5132147A
Expired / Lapsed
US
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Method for orienting a liquid crystalline polymer
Assignee: Eneos Corp
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Filing: 1990-06-06
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Granted: 1992-07-21
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Expires: 2010-06-06
Abstract
Abstract A highly orientated, liquid crystalline polymer having a light controlling function and suitable for use in the optoelectronic field is prepared by applying a solution of a polymer which exhibits a thermotropic liquid crystallinity onto a stretched polymer film, drying the applied solution, and thereafter heat-treating the thus-coated film at a temperature at which said liquid crystalline polymer exhibits a liquid crystal phase, for a time sufficient for the molecules of the liquid crystalline polymer to be orientated.
Inventors
- 👤 Yasuyuki Takiguchi
- 👤 Shigeki Iida
- 👤 Takehiro Toyooka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:05
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/355; G02F1/361; G02F1/3615; C; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3804; C09K19/3809; C09K19/3833; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133365; C09K2323/00; C09K2323/06; G02F1/1335; G02F1/13363; Y; Y10; Y10S; Y10S264/00; Y10S264/73
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
A method for orienting a liquid crystalline polymer comprising applying a solution of a polymer which exhibits a thermotropic liquid crystallinity, said polymer being present in said solution in a concentration in the range of between 5% and 50% by weight, onto a stretched polymer film, drying the applied solution, heat-treating the thus-coated film at a temperature at which said liquid crystalline polymer exhibits a liquid crystal phase, for a time sufficient for the molecules of the liquid crystalline polymer to be oriented, and thereafter cooling the coated film to a temperature below the glass transition point of said liquid crystalline polymer.
Claim 2
Independent Claim
102 words
A method for orienting a liquid crystalline polymer comprising applying a solution of a polymer which exhibits a thermotropic liquid crystallinity, said polymer being present in said solution in a concentration in the range of between 5% and 50% by weight, onto a stretched polymer film, drying the applied solution, heat-treating the thus-coated film at a temperature at which said liquid crystalline polymer exhibits a liquid crystal phase, for a time sufficient for the molecules of the liquid crystalline polymer to be oriented, and thereafter cooling the coated film to a temperature below the glass transition point of said liquid crystalline polymer.
Claim 3
Dependent Claim
31 words
A method as set forth in claim 1, wherein the heat treatment temperature and time are in the ranges of 50° to 300° C. and 10 seconds to 2 hours, respectively.
Claim 4
Dependent Claim
25 words
A method as set forth in claim 1, wherein the stretch ratio of said stretched polymer film is in the range of 1.5 to 5.
Claim 5
Dependent Claim
30 words
A method as set forth in claim 1, wherein said liquid crystalline polymer is a main chain type liquid crystalline polymer having liquid crystalline residues in the main chain thereof.
Claim 6
Dependent Claim
50 words
A method as set forth in claim 1, wherein said stretched polymer film is a film of a polymer selected from the group consisting of polyethylene terephthalate, polyacrylate, polyethylene naphthalate, polybutylene terephthalate, polyethylene ether ketone, polyethylene, polypropylene, polycarbonate, polystyrene, polyvinylidene chloride, polyimide, polyamide-imide, polyether imide, acetyl cellulose and polyvinyl alcohol.
Claim 7
Dependent Claim
24 words
A method as set forth in claim 4, wherein the liquid crystalline polymer has a glass transition point of not less than 30° C.
Claim 8
Dependent Claim
120 words
A method as set forth in claim 6, wherein said liquid crystalline polymer is selected from the group consisting of polyesters, polyester amides, polycarbonates and polyethers, said polyethers having a structural formula selected from the group consisting of: M.sup.1 --X.sup.1 --A.sup.1 --X.sup.2 -- wherein X 1 and X 2 are the same or different and are --COO--, --CONH--, --OCO or --O--; ##STR6## the * mark represents an asymmetric carbon atom; and n is an integer of 0 to 18; and ##STR7## where L is ##STR8## M 2 is --Ph--Ph--R, --O--Ph--Ph--R, --Ph--COO--Ph--R, --O--Ph--COO--Ph--R, --Ph--COO--Ph--R, --O--Ph--OCO--Ph--R, --Ph--Ph--COO--Ph--R, --O--Ph--Ph--COO--Ph--R, --Ph--OCO--Ph--Ph--R, --O--Ph--COO--Ph--Ph--R, --Ph--Ph--OCO--Ph--R, --O--Ph--OCO--Ph--Ph--R, --Ph--OCO--Ph--Ph--R, or --O--Ph--OCO--Ph--Ph--R; R is alkyl, alkoxy, halogen, nitro or cyano; and n is an integer of 0 to 18;
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-07-21 | 1996-01-20 | 1996-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-21 | 2000-01-20 | 2000-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-21 | 2004-01-20 | 2004-07-21 | $7700.00 | Window Closed / Lapsed |