US4895925A
Expired / Lapsed
US
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Melt-stable poly(arylene thioether-ketone) and production process thereof
Assignee: Kureha Corp
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Filing: 1988-05-12
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Granted: 1990-01-23
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Expires: 2008-05-12
Abstract
Abstract Disclosed herein are a melt-stable poly(arylene thioether-ketone) having predominant recurring units of the formula ##STR1## and having a melting point, Tm of 310°-380° C., a residual melt crystallization enthalpy, ΔHmc (420° C./10 min) of at least 10 J/g, a melt crystallization temperature, Tmc (420° C./10 min) of at least 210° C., and a reduced viscosity of 0.2-2 dl/g as measured at 25° C. and a polymer concentration of 0.5 g/dl in 98 wt. % sulfuric acid as well as a production process of the poly(arylene thioether-ketone). The poly(arylene thioether-ketone) has melt stability so that conventional melt processing techniques can be applied easily. The poly(arylene thioether-ketone) is a highly-crystalline polymer whose density is at least 1.34 g/cm 3 when annealed at 280° C. for 30 minutes.
Inventors
- 👤 Yoshikatsu Satake
- 👤 Takashi Kaneko
- 👤 Yutaka Kobayashi
- 👤 Yo Iizuka
- 👤 Takayuki Katto
- 👤 Zenya Shiiki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:52
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/02; C08G75/0204; C08G75/0236; C08G75/024; C08G75/0227; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/14; C08L; C08L101/00; C08L65/00; C08L71/00; C08L79/00; C08L79/04; C08L79/08; C08L81/00; C08L81/02; C08L81/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
155 words
A melt-stable poly(arylene thioether-ketone) having predominant recurring units of the formula ##STR8## wherein the --CO-- and --S-- are in the para position to each other, and having the following physical properties (a)-(c): (a) melting point, Tm being 310°-380° C.; (b) residual melt crystallization enthalpy, ΔHmc (420° C./10 min) being at least 10 J/g, and melt crystallization temperature, Tmc (420° C./10 min) being at least 210° C., wherein ΔHmc (420° C./10 min) and Tmc (420° C./10 min) are determined by a differential scanning calorimeter at a cooling rate of 10° C./min, after the poly(arylene thioether-ketone) is held at 50° C. for 5 minutes in an inert gas atmosphere, heated to 420° C. at a rate of 75° C./min and then held for 10 minutes at 420° C.; and (c) reduced viscosity being 0.2-2 dl/g as determined by viscosity measurement at 25° C. and a polymer concentration of 0.5 g/d in 98 percent by weight sulfuric acid.
Claim 2
Dependent Claim
155 words
A melt-stable poly(arylene thioether-ketone) having predominant recurring units of the formula ##STR8## wherein the --CO-- and --S-- are in the para position to each other, and having the following physical properties (a)-(c): (a) melting point, Tm being 310°-380° C.; (b) residual melt crystallization enthalpy, ΔHmc (420° C./10 min) being at least 10 J/g, and melt crystallization temperature, Tmc (420° C./10 min) being at least 210° C., wherein ΔHmc (420° C./10 min) and Tmc (420° C./10 min) are determined by a differential scanning calorimeter at a cooling rate of 10° C./min, after the poly(arylene thioether-ketone) is held at 50° C. for 5 minutes in an inert gas atmosphere, heated to 420° C. at a rate of 75° C./min and then held for 10 minutes at 420° C.; and (c) reduced viscosity being 0.2-2 dl/g as determined by viscosity measurement at 25° C. and a polymer concentration of 0.5 g/d in 98 percent by weight sulfuric acid.
Claim 3
Dependent Claim
33 words
The melt-stable poly(arylene thioetherketone) as claimed in claim 1, wherein the poly(arylene thioether-ketone) has a density of at least 1.34 g/cm 3 at 25° C. when annealed at 280° C. for 30 minutes.
Claim 4
Dependent Claim
17 words
The melt-stable poly(arylene thioetherketone) as claimed in claim 1, wherein the poly(arylene thioether-ketone) is an uncured polymer.
Claim 5
Dependent Claim
23 words
The melt-stable poly(arylene thioetherketone) as claimed in claim 1, wherein the poly(arylene thioether-ketone) is a polymer having a partially crosslinked and/or branched structure.
References Cited (Backward Citations)
JPS4713347Y1
Cited
JPS6058435A
Cited
JPS60104126A
Cited
DE3405523A1
Cited
US4590104A
Cited
US4698415A
Cited
JPS61221229A
Cited
US4745167A
Cited
US4690972A
Cited
US4716212A
Cited
EP0270955A2
Cited
EP0274754A2
Cited
EP0280325A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-22 | 1993-07-24 | 1994-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-22 | 1997-07-24 | 1998-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-22 | 2001-07-24 | 2002-01-23 | $7700.00 | Window Closed / Lapsed |