US5059356A
Expired / Lapsed
US
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Polarizing film
Assignee: Mitsui Chemicals Inc
•
Filing: 1990-09-06
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Granted: 1991-10-22
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Expires: 2010-09-06
Abstract
Abstract Disclosed is a polarizing film comprising a hydrophobic polymer containing a dichroic organic colorant in an oriented state which is characterized in that the dichroic organic colorant is substantially insoluble in water, organic solvents and liquid crystals and the dichroic ratio of the colorant is not less than 7 when it is measured with the film obtained by blending the colorant intimately with polyethylene terephthalate, melting the resulting blend and forming it into a film. This polarizing film has exceptionally excellent moisture resistance and thermal resistance.
Inventors
- 👤 Katsuji Nakamura
- 👤 Junichi Fujio
- 👤 Shin Hosonuma
- 👤 Masakatsu Nakatsuka
- 👤 Tsutomu Nishizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:14
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/30; G02B5/3025; G02B5/3033
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
A polarizing film comprising a hydrophobic polymer containing a dichroic organic colorant in an oriented state, wherein the dichroic organic colorant, which has the formula: ##STR200## has a solubility in water, organic solvents and liquid crystals of not greater than 0.05 percent by weight at about 25° C., and the dichroic ratio of the colorant is not less than 7 when it is measured with the film obtained by blending the colorant intimately with polyethylene terephthalate, melting the resulting blend and forming it into a film.
Claim 2
Dependent Claim
86 words
A polarizing film comprising a hydrophobic polymer containing a dichroic organic colorant in an oriented state, wherein the dichroic organic colorant, which has the formula: ##STR200## has a solubility in water, organic solvents and liquid crystals of not greater than 0.05 percent by weight at about 25° C., and the dichroic ratio of the colorant is not less than 7 when it is measured with the film obtained by blending the colorant intimately with polyethylene terephthalate, melting the resulting blend and forming it into a film.
Claim 3
Dependent Claim
38 words
The polarizing film as claimed in claim 1 wherein the hydrophobic polymer contains not less than 80 percent by weight of at least one polymer selected from the group consisting of polyethylene terephthalate, polyethylene naphthalate and polybutylene terephthalate.
Claim 4
Dependent Claim
189 words
A polarizing film comprising a hydrophobic polymer containing a dichroic organic colorant in an oriented state which is characterized in that the dichroic organic colorant, which is a compound of the formula: ##STR201## where R 1 , R 2 and R' 1 independently are a member selected from the group consisting of a hydrogen atom, a halogen atom, a methyl group and a methoxy group; n is a whole number equal to 1, 2 or 3; R 8 is: ##STR202## in which R 4 is a member selected from the group consisting of a phenyl radical, a biphenyl radical and a naphthalene radical that can be substituted by at least one member selected from the group consisting of R 1 , R 2 , --COOH and COOCH 3 , has a solubility in water, organic solvent and liquid crystals of not greater than 0.05 percent by weight at about 25° C., and the dichroic ratio of the colorant is not less than 7 when it is measured with the film obtained by blending the colorant intimately with polyethylene terephthalate, melting the resulting blend and forming it into a film.
Claim 5
Dependent Claim
189 words
A polarizing film comprising a hydrophobic polymer containing a dichroic organic colorant in an oriented state which is characterized in that the dichroic organic colorant, which is a compound of the formula: ##STR201## where R 1 , R 2 and R' 1 independently are a member selected from the group consisting of a hydrogen atom, a halogen atom, a methyl group and a methoxy group; n is a whole number equal to 1, 2 or 3; R 8 is: ##STR202## in which R 4 is a member selected from the group consisting of a phenyl radical, a biphenyl radical and a naphthalene radical that can be substituted by at least one member selected from the group consisting of R 1 , R 2 , --COOH and COOCH 3 , has a solubility in water, organic solvent and liquid crystals of not greater than 0.05 percent by weight at about 25° C., and the dichroic ratio of the colorant is not less than 7 when it is measured with the film obtained by blending the colorant intimately with polyethylene terephthalate, melting the resulting blend and forming it into a film.
Claim 6
Dependent Claim
37 words
A polarizing film as claimed in claim 3 wherein the hydrophobic polymer contains not less than 80% by weight of at least one polymer selected from the group consisting of polyethylene terephthalate, polyethylene naphthalate and polybutylene terephthalate.
References Cited (Backward Citations)
US3892734A
Cited
DE2121570A1
Cited
JPS5154447A
Cited
JPS51103131A
Cited
JPS5210342A
Cited
JPS5445153A
Cited
JPS5662873A
Cited
US4359570A
Cited
JPS5734177A
Cited
JPS5734117A
Cited
US4624532A
Cited
US4356102A
Cited
FR2492400A1
Cited
JPS5784409A
Cited
JPS57117580A
Cited
JPS57117582A
Cited
JPS57205448A
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JPS5853979A
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JPS5868008A
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JPS5868704A
Cited
JPS58125002A
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JPS5936181A
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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) | 1994-10-21 | 1995-04-22 | 1995-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-21 | 1999-04-22 | 1999-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-21 | 2003-04-22 | 2003-10-22 | $7700.00 | Window Closed / Lapsed |