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US4581428A
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Process for preparing "living" polymers using tetracoordinate organosilicon, organotin or organogermanium polymerization initiator with bifluoride ion source co-catalyst
Assignee: EIDP Inc
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Filing: 1984-10-18
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Granted: 1986-04-08
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Expires: 2004-10-18
Abstract
Abstract "Living" polymers, their preparation from acrylic-type or maleimide monomers and organosilicon, -tin or -germanium initiators, and bifluoride ion co-catalysts which are used in the preparation.
Inventors
- 👤 William B. Farnham
- 👤 Dotsevi Y. Sogah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:46
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/42; C08F293/00; C08F293/005
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
48 words
Process of preparing a "living" polymer, the process comprising contacting under polymerizing conditions at least one polar acrylic or maleimide monomer with (i) a tetracoordinate organosilicon, organotin or organogermanium polymerization initiator having at least one initiating site, and (ii) a co-catalyst which is a source of bifluoride ions.
Claim 2
Dependent Claim
48 words
Process of preparing a "living" polymer, the process comprising contacting under polymerizing conditions at least one polar acrylic or maleimide monomer with (i) a tetracoordinate organosilicon, organotin or organogermanium polymerization initiator having at least one initiating site, and (ii) a co-catalyst which is a source of bifluoride ions.
Claim 3
Dependent Claim
21 words
Process of claim 1, wherein the initiator compound also contains one or more functional substituents that are inert under polymerizing conditions.
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) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |