US4473690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic polymers of methacrylate esters
Assignee: Daicel Corp
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Filing: 1982-06-16
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Granted: 1984-09-25
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Expires: 2002-06-16
Abstract
Abstract A new organic polymer useful for the optical resolution or solvent fractionation is provided. The organic polymer is a homopolymer or copolymer comprising mainly a specific methacrylate ester constitutional unit and having (+) or (-) optical rotation and, therefore, an optical activity.
Inventors
- 👤 Heimei Yuki
- 👤 Yoshio Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:05
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/34; C08F20/12; C08F20/16; C08F20/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
84 words
An organic polymer comprising a main constitutional unit of the general formula: ##STR23## wherein R 1 , R 2 and R 3 may be the same or different and each represent ##STR24## X, Y and Z represent an alkyl, alkoxy or aromatic group and l, m and p represent the number of each substituent which is an integer of 1 to 3, with the proviso that all of R 1 , R 2 and R 3 should not represent ##STR25## at the same time.
Claim 2
Dependent Claim
84 words
An organic polymer comprising a main constitutional unit of the general formula: ##STR23## wherein R 1 , R 2 and R 3 may be the same or different and each represent ##STR24## X, Y and Z represent an alkyl, alkoxy or aromatic group and l, m and p represent the number of each substituent which is an integer of 1 to 3, with the proviso that all of R 1 , R 2 and R 3 should not represent ##STR25## at the same time.
Claim 3
Dependent Claim
13 words
An organic polymer according to claim 1 having (+) or (-) optical rotation.
Claim 4
Dependent Claim
26 words
A polymer as claimed in claim 1 in which two of R 1 , R 2 and R 3 are phenyl and the other is 4-pyridyl.
Claim 5
Dependent Claim
26 words
A polymer as claimed in claim 1 in which two of R 1 , R 2 and R 3 are phenyl and the other is naphthyl.
Claim 6
Dependent Claim
13 words
A polymer as claimed in claim 1 which also contains triphenylmethyl methacrylate units.
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) | 1987-09-25 | 1988-03-26 | 1988-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-25 | 1992-03-26 | 1992-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-25 | 1996-03-26 | 1996-09-25 | $7700.00 | Window Closed / Lapsed |