US4058505A
Expired / Lapsed
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Chain-extending amine end-capped polyimides
Assignee: University of Notre Dame
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Filing: 1975-03-14
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Granted: 1977-11-15
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Expires: 1995-03-14
Abstract
Abstract Aromatic polyimides with amine end groups are chain-extended (molecular weight increased) by reacting them with aromatic di- or tri- anhydrides. The reaction can either be at a temperature above the melting point of the reactants or in solvents for the reactants. The polyimides can be shaped and formed prior to chain-extending.
Inventors
- 👤 Gaetano Francis D'Alelio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:14
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/64; C08G18/6415; C08G18/6438; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1057; C08G73/1064; C08G73/1067; C08G73/1071; Y; Y10; Y10S; Y10S525/00; Y10S525/925; Y10S525/928
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
123 words
A polymeric chain-extending and cross-linking process comprising: reacting, at a temperature of about from ambient temperatures to 300° C, a polyimide of the formula: ##STR25## wherein Ar' is a tetravalent aromatic organic radical, the four carbonyl groups being attached directly to separate carbon atoms and each pair of carbonyl groups being attached to adjacent carbon atoms in the Ar' radical, Ar is a divalent aromatic organic radical, and n is a positive integer of at least 1, with an anhydride of the formula: ##STR26## wherein p is 3, and Ar' is a hexavalent aromatic organic radical, the six carbonyl groups being attached directly to separate carbon atoms and each pair of carbonyl groups being attached to adjacent carbon atoms in the Ar' radical.
Claim 2
Dependent Claim
123 words
A polymeric chain-extending and cross-linking process comprising: reacting, at a temperature of about from ambient temperatures to 300° C, a polyimide of the formula: ##STR25## wherein Ar' is a tetravalent aromatic organic radical, the four carbonyl groups being attached directly to separate carbon atoms and each pair of carbonyl groups being attached to adjacent carbon atoms in the Ar' radical, Ar is a divalent aromatic organic radical, and n is a positive integer of at least 1, with an anhydride of the formula: ##STR26## wherein p is 3, and Ar' is a hexavalent aromatic organic radical, the six carbonyl groups being attached directly to separate carbon atoms and each pair of carbonyl groups being attached to adjacent carbon atoms in the Ar' radical.
Claim 3
Dependent Claim
56 words
The process of claim 1 wherein Ar' in the polyimide is selected from the group consisting of ##STR27## Ar' in the anhydride is ##STR28## and Ar is selected from the group consisting of ##STR29## multiples thereof connected to each other by R IV , wherein R IV is alkylene of 1 to 3 carbon atoms, ##STR30##
Claim 4
Dependent Claim
11 words
The process of claim 2 wherein n is 4 to 20.
Claim 5
Dependent Claim
20 words
The process of claim 1 wherein the reaction is conducted at a temperature above the melting point of the reactants.
Claim 6
Dependent Claim
16 words
The process of claim 1 wherein the reaction is conducted in a solvent for the reactants.
Claim 7
Dependent Claim
23 words
The process of claim 5 wherein the solvent is a phenol of the formula: ##STR31## wherein each R 1 is hydrogen or methyl.
Claim 8
Dependent Claim
90 words
A polymeric chain-extending and cross-linking process comprising: reacting, at a temperature of about from ambient temperatures to 300° C, a polyimide of the formula: ##STR32## wherein Ar' is selected from the group consisting of ##STR33## Ar is selected from the group consisting of ##STR34## multiples thereof connected to each other by R IV , wherein R IV is alkylene of 1 to 3 carbon atoms, ##STR35## n is a positive integer of at least 3, with an anhydride of the formula: ##STR36## wherein p is 3 and Ar' is ##STR37##
Claim 9
Dependent Claim
90 words
A polymeric chain-extending and cross-linking process comprising: reacting, at a temperature of about from ambient temperatures to 300° C, a polyimide of the formula: ##STR32## wherein Ar' is selected from the group consisting of ##STR33## Ar is selected from the group consisting of ##STR34## multiples thereof connected to each other by R IV , wherein R IV is alkylene of 1 to 3 carbon atoms, ##STR35## n is a positive integer of at least 3, with an anhydride of the formula: ##STR36## wherein p is 3 and Ar' is ##STR37##
Claim 10
Dependent Claim
11 words
The process of claim 7 wherein n is 4 to 20.
Claim 11
Dependent Claim
20 words
The process of claim 8 wherein the reaction is conducted at a temperature above the melting point of the reactants.
Claim 12
Dependent Claim
16 words
The process of claim 8 wherein the reaction is conducted in a solvent for the reactants.
Claim 13
Dependent Claim
23 words
The process of claim 10 wherein the solvent is a phenol of the formula: ##STR38## wherein each R 1 is hydrogen or methyl.
Claim 14
Dependent Claim
10 words
A cross-linked polymer prepared by the process of claim 1.
Claim 15
Dependent Claim
10 words
A cross-linked polymer prepared by the process of claim 4.
Claim 16
Dependent Claim
10 words
A cross-linked polymer prepared by the process of claim 6.
Claim 17
Dependent Claim
10 words
A cross-linked polymer prepared by the process of claim 7.
Claim 18
Dependent Claim
10 words
A cross-linked polymer prepared by the process of claim 9.
Claim 19
Dependent Claim
10 words
A cross-linked polymer prepared by the process of claim 11.
Claim 20
Dependent Claim
78 words
The process of claim 7 wherein Ar is selected from the group consisting of --C 6 H 4 CH 2 C 6 H 4 --, --C 6 H 4 SO 2 C 6 H 4 --, --C 6 H 4 OC 6 H 4 SO 2 C 6 H 4 OC 6 H 4 --, --C 6 H 4 OC 6 H 4 OC 6 H 4 --, and --C 6 H 4 OC 6 H 4 --.
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) | 1980-11-14 | 1981-05-16 | 1981-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-14 | 1985-05-16 | 1985-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-14 | 1989-05-16 | 1989-11-15 | $7700.00 | Window Closed / Lapsed |