Patent US4588804A successfully refreshed from Google Patents.
US4588804A
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Polyimide compositions
Assignee: EIDP Inc
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Filing: 1984-05-04
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Granted: 1986-05-13
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Expires: 2004-05-04
Abstract
Abstract A soluble polyimide derived from dehydration of a polyamic acid which is the liquid phase condensation reaction product of a solution in aprotic solvent of approximately equimolar amounts of aromatic dianhydride and aromatic diamine. At least 50 mole % of the dianhydride must have ring linkages which prevent conjugation between the rings and at least 20 mole % of the diamine must contain electron withdrawing groups.
Inventors
- 👤 Michael Fryd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:10
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1057; C08G73/1064; C08G73/1042; C08G73/1046; C08G73/105
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
136 words
A polyimide derived from dehydration of a polyamic acid which is the liquid phase condensation reaction product of a solution in aprotic solvent of approximately equimolar amounts of aromatic dianhydride and aromatic diamine consisting essentially of: (1) A dianhydride reactant wherein a. 50-100 mole % of the dianhydride reactant corresponds to the formula: ##STR17## in which X is a 2,2-perfluoropropylene moiety; b. 50-0 mole % of the dianhydride reactant corresponds to the formula: ##STR18## in which X' is a divalent moiety containing no aliphatic carbon-carbon or carbon-hydrogen bonds; and (2) A diamine reactant wherein c. 20-100 mole % of the diamine reactant corresponds to the formula: ##STR19## in which Y is a sulfone moiety; and d. 80-0 mole % of the diamine reactant corresponds to the formula: ##STR20## in which Y' is a nonelectron withdrawing moiety.
Claim 2
Dependent Claim
136 words
A polyimide derived from dehydration of a polyamic acid which is the liquid phase condensation reaction product of a solution in aprotic solvent of approximately equimolar amounts of aromatic dianhydride and aromatic diamine consisting essentially of: (1) A dianhydride reactant wherein a. 50-100 mole % of the dianhydride reactant corresponds to the formula: ##STR17## in which X is a 2,2-perfluoropropylene moiety; b. 50-0 mole % of the dianhydride reactant corresponds to the formula: ##STR18## in which X' is a divalent moiety containing no aliphatic carbon-carbon or carbon-hydrogen bonds; and (2) A diamine reactant wherein c. 20-100 mole % of the diamine reactant corresponds to the formula: ##STR19## in which Y is a sulfone moiety; and d. 80-0 mole % of the diamine reactant corresponds to the formula: ##STR20## in which Y' is a nonelectron withdrawing moiety.
Claim 3
Dependent Claim
10 words
The polyimide of claim 1 in which X' is ##STR21##
Claim 4
Independent Claim
170 words
A method of making soluble polyimides comprising the steps of forming a uniform solution in aprotic solvent of approximately equimolar amounts of aromatic dianhydride and aromatic diamine consisting essentially of: (1) A dianhydride reactant wherein a. 50-100 mole % of the dianhydride reactant corresponds to the formula: ##STR22## in which X is a 2,2-perfluoropropylene moiety; b. 50-0 mole % of the dianhydride reactant corresponds to the formula: ##STR23## in which X' is a divalent moiety containing no aliphatic carbon-carbon or carbon-hydrogen bonds; and (2) A diamine reactant wherein c. 20-100 mole % of the diamine reactant corresponds to the formula: ##STR24## or mixtures thereof, in which Y is a sulfone moiety; and d. 80-0 mole % of the diamine reactant corresponds to the formula: ##STR25## in which Y' is a nonelectron withdrawing moiety, whereby the dianhydride reactant and diamine reactant coreact to form polyamic acid; and e. adjusting the temperature of the reaction solution to 160°-200° C. to effect dehydration of the polyamic acid and formation of the corresponding polyimide.
Claim 5
Independent Claim
170 words
A method of making soluble polyimides comprising the steps of forming a uniform solution in aprotic solvent of approximately equimolar amounts of aromatic dianhydride and aromatic diamine consisting essentially of: (1) A dianhydride reactant wherein a. 50-100 mole % of the dianhydride reactant corresponds to the formula: ##STR22## in which X is a 2,2-perfluoropropylene moiety; b. 50-0 mole % of the dianhydride reactant corresponds to the formula: ##STR23## in which X' is a divalent moiety containing no aliphatic carbon-carbon or carbon-hydrogen bonds; and (2) A diamine reactant wherein c. 20-100 mole % of the diamine reactant corresponds to the formula: ##STR24## or mixtures thereof, in which Y is a sulfone moiety; and d. 80-0 mole % of the diamine reactant corresponds to the formula: ##STR25## in which Y' is a nonelectron withdrawing moiety, whereby the dianhydride reactant and diamine reactant coreact to form polyamic acid; and e. adjusting the temperature of the reaction solution to 160°-200° C. to effect dehydration of the polyamic acid and formation of the corresponding polyimide.
Claim 6
Dependent Claim
18 words
The method of claim 3 in which the divalent moiety (X') of the dianhydride reactant b is ##STR26##
Claim 7
Dependent Claim
17 words
The polyimide of claim 1 in which the aprotic solvent is N-methyl pyrrolidone, dimethylacetamide dimethylsulfoxide or dimethylformamide.
Claim 8
Dependent Claim
11 words
The polyimide of claim 1 having an intrinsic viscosity of 0.7-0.8.
Claim 9
Dependent Claim
22 words
The polyimide of claim 1 in which the dianhydride reactant is a mixture of 50 mole % each of (a) and (b).
Claim 10
Dependent Claim
11 words
The polyimide of claim 7 in which the dianhydrides are ##STR27##
Claim 11
Dependent Claim
17 words
The polyimide of claim 1 in which dianhydride (a) is 100 mole % of the anhydride reactant.
Claim 12
Dependent Claim
19 words
The polyimide of claim 1 in which diamine (c) is at least 50 mole % of the diamine reactant.
Claim 13
Dependent Claim
22 words
The polyimide of claim 10 in which the diamine reactant is a mixture of 50 mole % each of (c) and (d).
Claim 14
Dependent Claim
20 words
The polyimide of claim 11 in which the diamine reactant is a mixture of 50 mole % each of ##STR28##
Claim 15
Dependent Claim
18 words
The polyimide of claim 10 in which diamine (c) is 100 mole % of the total diamine reactant.
Claim 16
Dependent Claim
11 words
The polyimide of claim 13 in which the diamine is ##STR29##
Claim 17
Dependent Claim
19 words
The polyimide of claim 7 in which diamine (c) is at least 50 mole % of the diamine reactant.
Claim 18
Dependent Claim
23 words
The polyimide of claim 8 in which the diamine reactant is a mixture of 50 mole % of each of (c) and (d).
Claim 19
Dependent Claim
20 words
The polyimide of claim 16 in which the diamine reactant is a mixture of 50 mole % each of ##STR30##
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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) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |