US3883450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing homo- and copolymers of cyclic acetals
Assignee: Hoechst AG
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Filing: 1974-05-09
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Granted: 1975-05-13
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Expires: 1994-05-09
Abstract
Abstract Homo- or copolymers of cyclic acetals, especially trioxane and dioxolane, are produced by catalytically initiated polymerisation of one or more monomers. As initiators anhydrous perfluoro-alkyl sulfonic acids are used, which are dissolved in inert organic solvents. The products are thermoplastic and are suitable for producing molded articles, especially injection molded articles.
Inventors
- 👤 Karlheinz Burg
- 👤 Helmut Schlaf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:02
CPC Classifications
C; C08; C08G; C08G4/00; C08G2/00; C08G2/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
15 words
IN A PROCESS FOR PRODUCING A MOLDABLE HOMOPOLYMER OF A CYCLIC ACETAL OF THE FORMULA
Claim 2
Dependent Claim
15 words
IN A PROCESS FOR PRODUCING A MOLDABLE HOMOPOLYMER OF A CYCLIC ACETAL OF THE FORMULA
Claim 3
Dependent Claim
12 words
A process according to claim 1 wherein said cyclic acetal is dioxolane.
Claim 4
Dependent Claim
25 words
A process according to claim 1 wherein the anhydrous perfluoroalkyl sulfonic acid is used in the form of a solution in an inert organic solvent.
References Cited (Backward Citations)
US3652465A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |