US5260109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for polarizing light
Assignee: Ricoh Co Ltd
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Filing: 1990-06-21
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Granted: 1993-11-09
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Expires: 2010-06-21
Abstract
Abstract The present invention provides a compensator for liquid crystal display comprising a light transmitting base, an alignment layer formed on the base, and a film formed on the alignment layer by a liquid crystalline polymer which contains as a main component a polyester consisting essentially of structural units (A) and (B) represented by the following formulae: ##STR1## (B) --O--R--O-- where R represents a straight chain or branched, divalent, aliphatic hydrocarbon group having 2 to 20 carbon atoms in which the hydrogen atoms may be substituted by halogen, phenyl, or alkoxy.
Inventors
- 👤 Shigeki Iida
- 👤 Takehiro Toyooka
- 👤 Yasuyuki Takiguchi
- 👤 Takamichi Enomoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:05
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/13363; C; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3804; C09K19/3809; C09K2323/00; C09K2323/06; G02F1/133633; G02F2413/00; G02F2413/01; G02F2413/08; G02F2413/15; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
122 words
A method of polarizing light comprising exposing light to a compensator, said compensator including a light transmitting base, an alignment layer formed on said base and a film formed on said alignment layer, said film being a liquid crystalline polymer composition comprising a polyester and an optically active compound, said polyester consisting essentially of repeating structural unit (A) having the structural formula ##STR25## and repeating unit (B) having the structural formula --O--R--O--, where R is a straight or branched chain, divalent aliphatic hydrocarbon group having 2 to 20 carbon atoms in which halogen, phenyl or alkoxy groups may be substituted for hydrogen atoms; said structural unit (A) present in said polyester in a proportion of 40 mole % to 60 mole %.
Claim 2
Independent Claim
122 words
A method of polarizing light comprising exposing light to a compensator, said compensator including a light transmitting base, an alignment layer formed on said base and a film formed on said alignment layer, said film being a liquid crystalline polymer composition comprising a polyester and an optically active compound, said polyester consisting essentially of repeating structural unit (A) having the structural formula ##STR25## and repeating unit (B) having the structural formula --O--R--O--, where R is a straight or branched chain, divalent aliphatic hydrocarbon group having 2 to 20 carbon atoms in which halogen, phenyl or alkoxy groups may be substituted for hydrogen atoms; said structural unit (A) present in said polyester in a proportion of 40 mole % to 60 mole %.
Claim 3
Dependent Claim
21 words
A method as set forth in claim 1, wherein said optically active compound is a polymer having an optically active group.
Claim 4
Dependent Claim
57 words
A method as set forth in claim 1, wherein said film is obtained by heat-treating said liquid crystalline polymer on said alignment layer at a temperature not lower than the liquid crystal transition point of the liquid crystalline polymer followed by rapid cooling at a rate of 100° C./min or higher to solidify the liquid crystal structure.
Claim 5
Dependent Claim
22 words
A method as set forth in claim 1 wherein R is ##STR26## where n is an integer of 2 to 20, ##STR27##
Claim 6
Dependent Claim
25 words
A method as set forth in claim 4 wherein R is ##STR28## where n is 2, 3, 4, 5, 6, 8, 10 or 12, ##STR29##
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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) | 1996-11-08 | 1997-05-10 | 1997-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-08 | 2001-05-10 | 2001-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-08 | 2005-05-10 | 2005-11-09 | $7700.00 | Window Closed / Lapsed |