Patent US1406453A successfully refreshed from Google Patents.
Patent US4504650A successfully refreshed from Google Patents.
US4504650A
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US
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Copolyetherimides and process of preparation
Assignee: General Electric Co
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Filing: 1983-12-05
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Granted: 1985-03-12
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Expires: 2003-12-05
Abstract
Abstract Copolyetherimides having random units in the structure and characterized by good transparency after molding are prepared by a process in which a dianhydride and a diamine are reacted at a temperature of at least 100° C. to initiate polymerization, followed by the addition of a second anhydride and continuing the polymerization at the elevated temperature. Preferred features include conducting the reaction in a solvent and in the presence of a chain stopper, such as phthalic anhydride.
Inventors
- 👤 Stephen M. Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:59
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1046; C08G73/1053; C08G73/1003; C08G73/1007; C08G73/101; C08G73/1014; C08G73/1028; C08G73/1042; C08G73/1057; C08G73/1064
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
109 words
A method for preparing a copolyetherimide, comprising (a) providing a reaction mixture comprising (1) a dianhydride of the formula ##STR10## in which Z is a divalent arylene, with (2) a diamine of the formula H.sub.2 N--R--NH.sub.2 in which R is a divalent organic radical selected from the group consisting of hydrocarbon radicals; (b) heating the reaction mixture to a temperature of at least 100° C. to initiate polymerization; and (c) adding to the reaction mixture a dianhydride of the formula ##STR11## (iv) a mixture of any of the foregoing, while continuing to heat the reaction mixture at a temperature of at least 100° C., whereby said polyetherimide is formed.
Claim 2
Independent Claim
109 words
A method for preparing a copolyetherimide, comprising (a) providing a reaction mixture comprising (1) a dianhydride of the formula ##STR10## in which Z is a divalent arylene, with (2) a diamine of the formula H.sub.2 N--R--NH.sub.2 in which R is a divalent organic radical selected from the group consisting of hydrocarbon radicals; (b) heating the reaction mixture to a temperature of at least 100° C. to initiate polymerization; and (c) adding to the reaction mixture a dianhydride of the formula ##STR11## (iv) a mixture of any of the foregoing, while continuing to heat the reaction mixture at a temperature of at least 100° C., whereby said polyetherimide is formed.
Claim 3
Dependent Claim
20 words
A process according to claim 1, in which the reaction is conducted at a temperature of at least 120° C.
Claim 4
Dependent Claim
23 words
A process according to claim 2, in which the reaction is conducted at a temperature of from about 120° to about 200° C.
Claim 5
Dependent Claim
21 words
A process according to claim 1, in which the dianhydride added in step (a) is 2,2-bis(4-(2,3-dicarboxyphenoxy)phenyl)propane dianhydride, having the formula ##STR12##
Claim 6
Dependent Claim
13 words
A process according to claim 4, in which the diamine is meta-phenylene diamine.
Claim 7
Dependent Claim
17 words
A process according to claim 5, in which the dianhydride, added in step (c) is pyromellitic dianhydride.
Claim 8
Dependent Claim
16 words
A process according to claim 5, in which the dianhydride added in step (c) is benzophenone-tert-dianhydride.
Claim 9
Dependent Claim
16 words
A process according to claim 1, in which the reaction is conducted in an organic solvent.
Claim 10
Dependent Claim
12 words
A process according to claim 8, in which the solvent is ortho-dichlorobenzene.
Claim 11
Dependent Claim
22 words
A process according to claim 1, in which in step (c) the dianhydride is added in individual portions of three or more.
Claim 12
Dependent Claim
18 words
A process according to claim 1, in which the reaction is conducted with a chain terminating compound present.
Claim 13
Dependent Claim
14 words
A process according to claim 11, in which the chain terminator is phthalic anhydride.
Claim 14
Dependent Claim
9 words
A copolyetherimide produced by the process of claim 1.
Claim 15
Dependent Claim
9 words
A copolyetherimide produced by the process of claim 6.
Claim 16
Dependent Claim
9 words
A copolyetherimide produced by the process of claim 7.
Claim 17
Dependent Claim
9 words
A copolyetherimide produced by the process of claim 10.
Claim 18
Dependent Claim
9 words
A copolyetherimide produced by the process of claim 12.
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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) | 1988-03-11 | 1988-09-10 | 1989-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-11 | 1992-09-10 | 1993-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-11 | 1996-09-10 | 1997-03-12 | $7700.00 | Window Closed / Lapsed |