US4874839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of poly(arylene ether ketones)
Assignee: RACHEM Corp 300 CONSTITUTION DRIVE MENLO PARK CALIFORNIA 94025 A CORP OF
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Filing: 1988-08-05
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Granted: 1989-10-17
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Expires: 2008-08-05
Abstract
Abstract A method of stabilizing a poly(arylene ether ketone), which method comprises in one embodiment heating the poly(arylene ether ketone) at a temperature between about 240° C. and about 325° C. for a period of between about 0.5 and about 24 hours, prior to any melt-processing of the poly(arylene ether ketone) and in another embodiment hydrothermally treating the poly(arylene ether ketone) by heating it to a temperature of at least 160° C. while contacting it with water.
Inventors
- 👤 Wayne Montoya
- 👤 Robert H. Reamey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:49
CPC Classifications
C; C08; C08F; C08F6/00; C08G; C08G61/00; C08G61/12; C08G61/127; C08G65/00; C08G65/34; C08G65/46
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
45 words
A method of stabilizing a poly(arylene ether ketone), comprising heating the poly(arylene ether ketone) at a temperature between about 240° C. and about 325° C. for a period of between about 0.5 and about 24 hours, prior to any melt-processing of the poly(arylene ether ketone).
Claim 2
Independent Claim
45 words
A method of stabilizing a poly(arylene ether ketone), comprising heating the poly(arylene ether ketone) at a temperature between about 240° C. and about 325° C. for a period of between about 0.5 and about 24 hours, prior to any melt-processing of the poly(arylene ether ketone).
Claim 3
Dependent Claim
17 words
A method according to claim 1, wherein the heating is performed in an air or nitrogen atmosphere.
Claim 4
Dependent Claim
14 words
A method according to claim 1, wherein the heating is performed under a vacuum.
Claim 5
Dependent Claim
32 words
A method according to claim 1, wherein the heating is performed at a temperature between about 275° and about 310° C. for a period of between about 2 and about 17 hr.
Claim 6
Independent Claim
31 words
A method of stabilizing a poly(arylene ether ketone), comprising hydrothermally treating the poly(arylene ether ketone) by heating it to a temperature of at least 160° C. while contacting it with water.
Claim 7
Independent Claim
31 words
A method of stabilizing a poly(arylene ether ketone), comprising hydrothermally treating the poly(arylene ether ketone) by heating it to a temperature of at least 160° C. while contacting it with water.
Claim 8
Dependent Claim
33 words
A method according to claim 5, wherein the hydrothermal treatment is performed at a temperature between about 240° and about 300° C. for a period of between about 0.25 and about 5 hr.
Claim 9
Dependent Claim
31 words
A method according to claim 5, wherein the hydrothermal treatment is performed in a pressurized vessel in which the poly(arylene ether ketone) is at least partially immersed in an aqueous medium.
Claim 10
Dependent Claim
14 words
A method according to claim 7, wherein the aqueous medium consists essentially of water.
Claim 11
Dependent Claim
21 words
A method according to claim 5, wherein the hydrothermal treatment is performed by contacting the poly(arylene ether ketone) with superheated steam.
Claim 12
Dependent Claim
24 words
A method according to claim 1 or 5 wherein the poly(arylene ether ketone) has a repeat unit selected from the group consisting of ##STR2##
Claim 13
Dependent Claim
25 words
A method according to claim 1 or 5 wherein the poly(arylene ether ketone) has been made by a Friedel-Crafts polymerization with a Lewis acid catalyst.
Claim 14
Dependent Claim
14 words
A method according to claim 11, wherein the Lewis acid catalyst is aluminum chloride.
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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) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |