Patent US3880822A successfully refreshed from Google Patents.
US3880822A
Expired / Lapsed
US
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Modified polymer compounds and process for the preparation thereof
Assignee: Individual
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Filing: 1972-04-14
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Granted: 1975-04-29
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Expires: 1992-04-14
Abstract
Abstract There are provided modified polymer compounds containing nitrous, oxime or nitro-functional groups and/or bridges of the intermolecular ''''bis-nitrous'''' type or hydrogen-bonded oximes to nitro or nitrous groups. The modified polymers are prepared by reacting an ethylenically- or aromatically-unsaturated polymer with nitrogen oxide, optionally in the presence of a higher nitrogen oxide, a C-nitro-alkyl compound or a metal-containing catalyst. The modified polymer compounds are capable of coupling or cross-linking to provide higher molecular weight polymers with improved physical characteristics, yet without, loss of other desirable properties, such as crystallinity.
Inventors
- 👤 Emilio Perrotti
- 👤 Federico Maspero
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:00
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A PROCESS FOR THE PREPARATION OF MODIFIED POLYISOPRENE WHICH COMPRISES CONTACTING A SOLUTION OF POLYISOPRENE IN AN INERT SOLVENT FOR POLYISOPRENE AND NITROGEN OXIDE OR AN AQUEOUS SUSPENSION OF POLYISOPRENE WITH NITROGEN OXIDE IN THE PRESENCE OF A RHCL(P$3)3 CATALYST.
Claim 2
Dependent Claim
40 words
A PROCESS FOR THE PREPARATION OF MODIFIED POLYISOPRENE WHICH COMPRISES CONTACTING A SOLUTION OF POLYISOPRENE IN AN INERT SOLVENT FOR POLYISOPRENE AND NITROGEN OXIDE OR AN AQUEOUS SUSPENSION OF POLYISOPRENE WITH NITROGEN OXIDE IN THE PRESENCE OF A RHCL(P$3)3 CATALYST.
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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |