US4461887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Birefringent polymer containing recurring units from dienoic acid
Assignee: Polaroid Corp
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Filing: 1983-05-26
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Granted: 1984-07-24
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Expires: 2003-05-26
Abstract
Abstract Disclosed is a class of polymers comprising recurring units of the formula ##STR1## where Mu is a divalent radical having the formula ##STR2## where each of D, D', E and E' is hydrogen, alkyl or substituted-alkyl; and Az is a divalent radical having the formula ##STR3## where each of R and R' is hydrogen, alkyl, aryl, alkaryl or aralkyl and W is a single bond, alkylene or alkenylene; or Az is a divalent radical having the formula ##STR4## where each of Y and Y' represent the atoms necessary to complete a piperazine or substituted-piperazine radical. Molecularly oriented polymers of the invention exhibit birefringence and can be utilized in filter, polarizing and other optical devices.
Inventors
- 👤 Howard G. Rogers
- 👤 Russell A. Gaudiana
- 👤 Jeannette S. Manello
- 👤 Ronald A. Sahatjian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:29
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G73/00; C08G73/06; C08G73/0622; C08G73/0633
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
71 words
A film- or fiber-forming polymer comprising recurring units of the formula: ##STR38## where Mu is a divalent radical having the formula ##STR39## where each of D, D', E and E' is hydrogen, alkyl or substituted-alkyl; and Az is a divalent radical having the formula ##STR40## where each of Y and Y' represent the atoms necessary to complete with the nitrogen atoms to which they are bonded a piperazine or substituted-piperazine radical.
Claim 2
Dependent Claim
71 words
A film- or fiber-forming polymer comprising recurring units of the formula: ##STR38## where Mu is a divalent radical having the formula ##STR39## where each of D, D', E and E' is hydrogen, alkyl or substituted-alkyl; and Az is a divalent radical having the formula ##STR40## where each of Y and Y' represent the atoms necessary to complete with the nitrogen atoms to which they are bonded a piperazine or substituted-piperazine radical.
Claim 3
Dependent Claim
18 words
The film- or fiber-forming polymer of claim 1 wherein each of D, D', E and E' is hydrogen.
Claim 4
Dependent Claim
32 words
The film- or fiber-forming polymer of claim 2 wherein each of Y and Y' represent the atoms necessary to complete with the nitrogen atoms to which they are bonded the piperazine radical.
Claim 5
Dependent Claim
32 words
The film- or fiber-forming polymer of claim 2 wherein each of Y and Y' represent the atoms necessary to complete with the nitrogen atoms to which they are bonded the 2-methylpiperazine radical.
Claim 6
Dependent Claim
32 words
The film- or fiber-forming polymer of claim 2 wherein each of Y and Y' represent the atoms necessary to complete with the nitrogen atoms to which they are bonded the 2,5-dimethylpiperazine radical.
Claim 7
Dependent Claim
24 words
The film- or fiber-forming polymer of claim 1 wherein each of D and E' is methyl and each of D' and E is hydrogen.
Claim 8
Dependent Claim
32 words
The film- or fiber-forming polymer of claim 6 wherein each of Y and Y' represent the atoms necessary to complete with the nitrogen atoms to which they are bonded the piperazine radical.
Claim 9
Dependent Claim
32 words
The film- or fiber-forming polymer of claim 6 wherein each of Y and Y' represent the atoms necessary to complete with the nitrogen atoms to which they are bonded the 2-methylpiperazine radical.
Claim 10
Dependent Claim
32 words
The film- or fiber-forming polymer of claim 6 wherein each of Y and Y' represent the atoms necessary to complete with the nitrogen atoms to which they are bonded the 2,5-dimethylpiperazine radical.
Claim 11
Dependent Claim
79 words
A birefringent molecularly oriented polymer in the form of a film or fiber comprising recurring units of the formula: ##STR41## where Mu is a divalent radical having the formula ##STR42## where each of D, D', E and E' is hydrogen, alkyl or substituted-alkyl; and Az is a divalent radical having the formula ##STR43## where each of Y and Y' represent the atoms necessary to complete with the nitrogen atoms to which they are bonded a piperazine or substituted-piperazine radical.
Claim 12
Dependent Claim
79 words
A birefringent molecularly oriented polymer in the form of a film or fiber comprising recurring units of the formula: ##STR41## where Mu is a divalent radical having the formula ##STR42## where each of D, D', E and E' is hydrogen, alkyl or substituted-alkyl; and Az is a divalent radical having the formula ##STR43## where each of Y and Y' represent the atoms necessary to complete with the nitrogen atoms to which they are bonded a piperazine or substituted-piperazine radical.
Claim 13
Dependent Claim
21 words
The birefringent molecularly oriented polymeric film or fiber of claim 10 wherein each of D, D', E and E' is hydrogen.
Claim 14
Dependent Claim
45 words
The birefringent molecularly oriented polymeric film or fiber of claim 11 wherein each of Y and Y' represent the atoms necessary to complete with the nitrogen atoms to which they are bonded a substituted-piperazine radical selected from the group consisting of piperazine, 2-methylpiperazine and 2,5-dimethylpiperazine.
Claim 15
Dependent Claim
27 words
The birefringent molecularly oriented polymeric film or fiber of claim 10 wherein each of D and E' is methyl and each of D' and E is hydrogen.
Claim 16
Dependent Claim
35 words
The birefringent molecularly oriented polymeric film or fiber of claim 13 wherein each of Y and Y' represent the atoms necessary to complete with the nitrogen atoms to which they are bonded the piperazine radical.
Claim 17
Dependent Claim
35 words
The birefringent molecularly oriented polymeric film or fiber of claim 13 wherein each of Y and Y' represent the atoms necessary to complete with the nitrogen atoms to which they are bonded the 2-methylpiperazine radical.
Claim 18
Dependent Claim
35 words
The birefringent molecularly oriented polymeric film or fiber of claim 13 wherein each of Y and Y' represent the atoms necessary to complete with the nitrogen atoms to which they are bonded the 2,5-dimethylpiperazine radical.
Claim 19
Dependent Claim
18 words
The birefringent molecularly oriented polymer of claim 10 in the form of a unidirectionally stretched film or fiber.
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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) | 1987-07-24 | 1988-01-23 | 1988-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-24 | 1992-01-23 | 1992-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-24 | 1996-01-23 | 1996-07-24 | $7700.00 | Window Closed / Lapsed |