US3886121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing aromatic polyethers
Assignee: Denka Co Ltd
•
Filing: 1974-07-30
•
Granted: 1975-05-27
•
Expires: 1994-07-30
Abstract
Abstract Aromatic polymers are prepared by heating a condensed oligomer having an average of 1 - 10 units having the formula: WHEREIN Z represents - SO2 or - CO -, or the rings are directly connected; Z'' represents - SO2 - or - CO-; and the ether bond is ortho or para to Z or Z''; at 150* - 400*C in a vacuum or in an inert gas atmosphere in the absence of a solvent.
Inventors
- 👤 Norio Yagi
- 👤 Hiroshi Okai
- 👤 Makoto Fukuda
- 👤 Ikuji Kishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:56
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/40; C08G65/4093; C08G65/4012; C08G75/00; C08G75/20; C08G75/23
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
24 words
A PROCESS FOR PREPARING AN AROMATIC POLYMER WHICH COMPRISES HEATING A CONDENSED ALIGOMER HAVING AN AVERAGE OF 1 - 10 UNITS HAVING THE FORMULA
Claim 2
Dependent Claim
24 words
A PROCESS FOR PREPARING AN AROMATIC POLYMER WHICH COMPRISES HEATING A CONDENSED ALIGOMER HAVING AN AVERAGE OF 1 - 10 UNITS HAVING THE FORMULA
Claim 3
Dependent Claim
22 words
The process of claim 1, wherein the condensed oligomer is prepared by polycondensing a di-alkalimetal salt of a diphenol having the formula
Claim 4
Dependent Claim
16 words
The process of claim 2, wherein the inert polar organic solvent is a substantially anhydrous solvent.
Claim 5
Dependent Claim
19 words
The process of claim 2, wherein the inert polar organic solvent contains 1 - 20 wt. % of water.
Claim 6
Dependent Claim
24 words
The process of claim 1, wherein the condensed oligomer is heated at 180* - 380*C in a vacuum in the absence of a solvent.
Claim 7
Dependent Claim
26 words
The process of claim 1, wherein the condensed oligomer is heated at 180* - 380*C in an inert gas atmosphere in the absence of a solvent.
Claim 8
Dependent Claim
14 words
The process of claim 1, wherein the condensed oligomer has units having the formula
Claim 9
Dependent Claim
14 words
The process of claim 1, wherein the condensed oligomer has units having the formula
Claim 10
Dependent Claim
14 words
The process of claim 1, wherein the condensed oligomer has units having the formula
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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |