US4840640A
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Polarizing film: polymer film base containing substituted anthraquinone dichroic dye
Assignee: Mitsubishi Chemical Corp
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Filing: 1987-06-16
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Granted: 1989-06-20
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Expires: 2007-06-16
Abstract
Abstract A polarizing film which comprises a film base having thereon an anthraquinone dye of general formula (I): <IMAGE> (I) wherein R1 and R2 each represents a hydrogen atom, an alkyl group, an alkoxy group, an aralkyloxy group, an aryl group, a cyclohexyl group, a 4-alkylcyclohexyl group, a carboxylic acid ester group, a carboxylic acid amide group, a halogen atom, <IMAGE> X represents an oxygen atom, a sulfur atom or an amino group.
Inventors
- 👤 Konoe Miura
- 👤 Tetsuo Ozawa
- 👤 Seigo Okumura
- 👤 Hidetoshi Urashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:18
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/30; C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/22; G02B5/3025; G02B5/3033; G03; G03B; G03B17/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
73 words
A polarizing film which comprises a film base having thereon an anthraquinone dye of general formula (I): ##STR41## wherein R 1 and R 2 each represents a hydrogen atom, an alkyl group, an alkoxy group, an aralkyloxy group, an aryl group, a cyclohexyl group, a 4-alkylcyclohexyl group, a carboxylic acid ester group, a carboxylic acid amide group, a halogen atom, ##STR42## X represents an oxygen atom, a sulfur atom or an amino group.
Claim 2
Dependent Claim
73 words
A polarizing film which comprises a film base having thereon an anthraquinone dye of general formula (I): ##STR41## wherein R 1 and R 2 each represents a hydrogen atom, an alkyl group, an alkoxy group, an aralkyloxy group, an aryl group, a cyclohexyl group, a 4-alkylcyclohexyl group, a carboxylic acid ester group, a carboxylic acid amide group, a halogen atom, ##STR42## X represents an oxygen atom, a sulfur atom or an amino group.
Claim 3
Dependent Claim
31 words
The polarizing film of claim 1 wherein said film is obtained by melting an organic resin and said anthraquinone dye, forming said dye into a sheet, and stretching said sheet uniaxially.
Claim 4
Dependent Claim
129 words
A polarizing film according to claim 2, wherein the anthraquinone dye of the general formula (I) in which R 1 and R 2 each represents a hydrogen atom, C 1 -C 9 alkyl group, C 1 -C 9 alkoxyl group, a benzyloxy group, a benzyloxy group substituted by C 1 -C 9 alkyl group or C 1 -C 9 alkoxy group, ##STR43## (wherein R 3 represents a hydrogen group or C 1 -C 9 alkyl group; R 4 represents a hydrogen atom, C 1 -C 9 alkyl group, or C 1 -C 9 alkoxyl group), trans-4-alkylcyclohexyl group substituted by C 1 -C 9 alkyl group, ##STR44## --COO--R 5 (wherein R 5 represents C 1 -C 9 alkyl group), ##STR45## a fluorine atom, a chlorine atom or a bromine atom.
Claim 5
Dependent Claim
13 words
A polarizing film according to claim 2, wherein the anthraquinone dye is ##STR46##
Claim 6
Dependent Claim
13 words
A polarizing film according to claim 2, wherein the anthraquinone dye is ##STR47##
Claim 7
Dependent Claim
26 words
A polarizing film according to claim 2, wherein the highly heat- and moisture-resistant film base is of polyesters, polyamides, polyimides, or liquid crystalline polyethylene terephthalate-parahydroxybenzoic acid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |