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Patent US4076680A successfully refreshed from Google Patents.
US4076680A
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Poly(hydroxymethylene) solutions
Assignee: Honeywell International Inc
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Filing: 1976-08-05
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Granted: 1978-02-28
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Expires: 1996-08-05
Abstract
Abstract Solutions in substantially anhydrous hydrazine of poly(hydroxymethylene) and copolymers of hydroxymethylene with up to about 30 mol percent of ethylenically unsaturated comonomers are suitable for solution spinning to make filaments, i.e. fibers and film.
Inventors
- 👤 Murali K. Akkapeddi
- 👤 Herbert K. Reimschuessel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:23
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
57 words
A solution in hydrazine of a polymer selected from the group consisting of (a) poly(hydroxymethylene), (b) copolymers of hydroxymethylene with up to about 30 mol percent of ethylenically unsaturated comonomers, and (c) mixtures thereof, said solution containing not more than about 10 percent by weight of water, based on the combined weight of the hydrazine and water.
Claim 2
Dependent Claim
57 words
A solution in hydrazine of a polymer selected from the group consisting of (a) poly(hydroxymethylene), (b) copolymers of hydroxymethylene with up to about 30 mol percent of ethylenically unsaturated comonomers, and (c) mixtures thereof, said solution containing not more than about 10 percent by weight of water, based on the combined weight of the hydrazine and water.
Claim 3
Dependent Claim
29 words
A solution according to claim 1, said solution containing not more than about 6 percent by weight of water, based on the combined weight of the hydrazine and water.
Claim 4
Dependent Claim
11 words
A solution according to claim 1 wherein the polymer is poly(hydroxymethylene).
Claim 5
Dependent Claim
11 words
A solution according to claim 2 wherein the polymer is poly(hydroxymethylene).
Claim 6
Dependent Claim
69 words
A method for making a solution according to claim 1 which comprises dissolving a precursor polymer selected from the group consisting of poly(vinylene carbonate) and copolymers of vinylene carbonate with up to about 30 mol percent of ethylenically unsaturated comonomer in hydrazine containing not more than about 10 percent by weight of water, based on the combined weight of the hydrazine and water, and heating the solution thus obtained.
Claim 7
Dependent Claim
20 words
The method of claim 5 wherein the precursor polymer is poly(vinylene carbonate), and solution obtained is a solution of poly(hydroxymethylene).
Claim 8
Dependent Claim
30 words
The method according to claim 6 wherein the hydrazine contains not more than about 6 percent by weight of water, based on the combined weight of the hydrazine and water.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |