US4522990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light stable polymers by anionic polymerization
Assignee: EIDP Inc
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Filing: 1983-12-16
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Granted: 1985-06-11
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Expires: 2003-12-16
Abstract
Abstract Anionic polymerization initiator which is a 2,2,6,6-tetramethylpiperidinyl alkali metal or an alkali metal 2,6-dimethyl-2,6-dialkyl-4-piperidinoxide.
Inventors
- 👤 Gerald D. Andrews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:35
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/08; C09; C09D; C09D133/00; C09D133/04; C09D133/06; C08L; C08L61/00; C08L61/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
72 words
In an anionic polymerization process for polymerizing at least one anionically polymerizable monomer selected from the group consisting of alkyl methacrylates, fluoroalkyl methacrylates, alkoxyalkyl methacrylates, dialkylaminoalkyl methacrylates and alkadienyl methacrylates, the improvement consisting of using the initiator of the formula ##STR3## wherein R is H or C 1-4 alkyl, R' is H, C 1-18 alkyl or C 7-12 aralkyl, and M is alkali metal to produce a polymer having good light stability.
Claim 2
Dependent Claim
72 words
In an anionic polymerization process for polymerizing at least one anionically polymerizable monomer selected from the group consisting of alkyl methacrylates, fluoroalkyl methacrylates, alkoxyalkyl methacrylates, dialkylaminoalkyl methacrylates and alkadienyl methacrylates, the improvement consisting of using the initiator of the formula ##STR3## wherein R is H or C 1-4 alkyl, R' is H, C 1-18 alkyl or C 7-12 aralkyl, and M is alkali metal to produce a polymer having good light stability.
Claim 3
Dependent Claim
12 words
Process of claim 1 wherein each anionically polymerizable monomer is a methacrylate.
Claim 4
Dependent Claim
10 words
Process of claim 2 wherein the methacrylate is methyl methacrylate.
Claim 5
Dependent Claim
15 words
Process of claim 2 wherein the methacrylates comprise methyl methacrylate, butyl methacrylate and 2,4-hexadienyl methacrylate.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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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) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |