US4511475A
Expired / Lapsed
US
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Optically active polymer preparation and use
Assignee: Daicel Corp
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Filing: 1982-11-22
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Granted: 1985-04-16
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Expires: 2002-11-22
Abstract
Abstract A novel optically active polymer comprising structural elements of the formula: ##STR1## The polymer is applicable for the optical resolution of a racemic mixture through, for instance, column chromatography.
Inventors
- 👤 Heimei Yuki
- 👤 Yoshio Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:32
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/12; C08F20/16; C08F20/18; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
64 words
A process for the optical resolution of a racemic mixture which comprises contacting the racemic mixture with a stereoregular, highly isotactic, optically active polymer comprising recurring structural units of the formula: ##STR31## and having a polymerization degree of not less than 5, said polymer having a specific rotation [α] D 20 of not less than 50° as an absolute value, either + or -.
Claim 2
Dependent Claim
64 words
A process for the optical resolution of a racemic mixture which comprises contacting the racemic mixture with a stereoregular, highly isotactic, optically active polymer comprising recurring structural units of the formula: ##STR31## and having a polymerization degree of not less than 5, said polymer having a specific rotation [α] D 20 of not less than 50° as an absolute value, either + or -.
Claim 3
Dependent Claim
60 words
A process as claimed in claim 1, in which said polymer consists of an isotactic homopolymer of triphenylmethyl methacrylate having a helical structure predominantly of one screw sense, said polymer being insoluble in methanol and having absorption bands at 208 nm, 232 nm and four absorption bands in the range of 257 to 280 nm in the circular dichroism spectrum.
Claim 4
Dependent Claim
20 words
A process as claimed in claim 1, in which the polymerization degree of the polymer is not less than 20.
Claim 5
Dependent Claim
20 words
A process as claimed in claim 1, in which the polymerization degree of the polymer is not less than 50.
Claim 6
Dependent Claim
20 words
A process as claimed in claim 1, in which the polymerization degree of the polymer is not less than 100.
Claim 7
Dependent Claim
28 words
A process as claimed in claim 1, in which the racemic mixture is flowed through a chromatography column packed with a packing material comprising said optically active polymer.
Claim 8
Dependent Claim
28 words
A process as claimed in claim 6, in which said packing material is particles consisting essentially of said optically active polymer and particles of another inert solid substance.
Claim 9
Dependent Claim
36 words
A process as claimed in claim 7, in which said inert solid substance is porous microparticles of a material selected from the group consisting of silica, alumina, glass beads, polystyrene resin, polyamide resin and polyacrylate resin.
Claim 10
Dependent Claim
18 words
A process as claimed in claim 7, in which said inert solid substance is porous microparticles of silica.
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) | 1988-04-15 | 1988-10-15 | 1989-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-15 | 1992-10-15 | 1993-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-15 | 1996-10-15 | 1997-04-16 | $7700.00 | Window Closed / Lapsed |