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US4711942A
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"Living" polymers and process for their preparation
Assignee: EIDP Inc
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Filing: 1984-10-18
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Granted: 1987-12-08
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Expires: 2004-10-18
Abstract
Abstract "Living" polymers and their preparation from acrylic-type or maleimide monomers and organosilicon, -tin or -germanium initiators.
Inventors
- 👤 Owen W. Webster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:57
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/42; C08F4/72
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
56 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 fluoride, cyanide or azide ions or a suitable Lewis acid.
Claim 2
Dependent Claim
56 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 fluoride, cyanide or azide ions or a suitable Lewis acid.
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.
Claim 4
Dependent Claim
8 words
Polymer formed in the process of claim 1.
References Cited (Backward Citations)
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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) | 1990-12-07 | 1991-06-08 | 1991-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-07 | 1995-06-08 | 1995-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-07 | 1999-06-08 | 1999-12-08 | $7700.00 | Window Closed / Lapsed |