US5081229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyimide having excellent thermal dimensional stability
Assignee: Kanegafuchi Chemical Industry Co Ltd
•
Filing: 1989-06-07
•
Granted: 1992-01-14
•
Expires: 2009-06-07
Abstract
Abstract The present invention provides a copolyimide characterized in that the copolyimide contains units represented by formulas (I) and (II) ##STR1## (wherein R 0 represents an aromatic tetracarboxylic residue). The polyimide has excellent thermal dimensional stability, and can be fabricated by using conventional inexpensive materials.
Inventors
- 👤 Kiyokazu Akahori
- 👤 Hideki Kawai
- 👤 Hirosaku Nagano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:38
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1067; C08G73/1071; C08G73/1042; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
246 words
A copolyimide consisting essentially of units represented by formula (I) and units represented by formula(II): ##STR6## wherein R 0 is an aromatic tetracarboxylic acid residue, said copolyimide being prepared by a method comprising the steps of: (a) reacting the following two components: (i) an aromatic tetracarboxylic dianhydride, and (ii) a diamine component consisting essentially of at least one diamine selected from the group consisting of 4,4'-diaminoodiphenyl ether and paraphenylene diamine, wherein the amount of one of said two components is in molar excess over the amount of the other of said two components, so that the resulting amic acid prepolymer is terminated with groups derived from the component which is inn molar excess; (b) reacting said amic acid prepolymer with a sufficient amount of at least one of said two components so that the total number of moles of component (i) used in steps (a) and (b) is equal to the total number of moles of component (ii) used in steps (a) and (b), provided that the diamine component added in step (b) contains 4,4'-diaminophenyl ether if the diamine component added in step (a) does not contain 4,4'-diaminophenyl ether, and further provided that the diamine component added in step (b) contains paraphenylene diamine if the amine component added in step (a) does not contain paraphenylene diamine, to give a copolyamic acid consisting essentially of units represented by formula (III) and units represented by formula (IV): ##STR7## and (c) dehydrating said polyamic acid to obtain said copolyimide.
Claim 2
Dependent Claim
246 words
A copolyimide consisting essentially of units represented by formula (I) and units represented by formula(II): ##STR6## wherein R 0 is an aromatic tetracarboxylic acid residue, said copolyimide being prepared by a method comprising the steps of: (a) reacting the following two components: (i) an aromatic tetracarboxylic dianhydride, and (ii) a diamine component consisting essentially of at least one diamine selected from the group consisting of 4,4'-diaminoodiphenyl ether and paraphenylene diamine, wherein the amount of one of said two components is in molar excess over the amount of the other of said two components, so that the resulting amic acid prepolymer is terminated with groups derived from the component which is inn molar excess; (b) reacting said amic acid prepolymer with a sufficient amount of at least one of said two components so that the total number of moles of component (i) used in steps (a) and (b) is equal to the total number of moles of component (ii) used in steps (a) and (b), provided that the diamine component added in step (b) contains 4,4'-diaminophenyl ether if the diamine component added in step (a) does not contain 4,4'-diaminophenyl ether, and further provided that the diamine component added in step (b) contains paraphenylene diamine if the amine component added in step (a) does not contain paraphenylene diamine, to give a copolyamic acid consisting essentially of units represented by formula (III) and units represented by formula (IV): ##STR7## and (c) dehydrating said polyamic acid to obtain said copolyimide.
Claim 3
Dependent Claim
20 words
A copolyimide according to claim 1, wherein component (i) is used in molar excess over component (ii) in step (a).
Claim 4
Dependent Claim
60 words
A copolyimide according to claim 2, wherein the amount of component (ii) used in step (a) is 10 to 90 mole % of the amount of component (ii) used in steps (a) to (c), and the amount of component (i) used in step (a) is 40 to 99 mole % of the amount of component (i) used in step (a).
Claim 5
Dependent Claim
20 words
A copolyimide according to claim 1, wherein component (i) is used in molar excess over component (ii) in step (a).
Claim 6
Dependent Claim
17 words
A copolyimide according to claim 1, wherein the component (ii) used in step (a) is 4,4'-diaminodiphenyl ether.
Claim 7
Dependent Claim
17 words
A copolyimide according to claim 1, wherein the component (ii) used in step (a) is paraphenylene diamine.
Claim 8
Dependent Claim
32 words
A copolyimide according too claim 1, wherein the total molar ratio of the unit represented by formula (I) to the unit represented by formula (II) is in the range 1/9 to 9/1.
Claim 9
Dependent Claim
13 words
A copolyimide according to claim 1, wherein the component (i) is pyromellitic dianhydride.
Claim 10
Dependent Claim
14 words
A copolyimide according to claim 1, wherein said dehydrating step (c) is thermal dehydration.
Claim 11
Dependent Claim
14 words
A copolyimide according too claim 1, wherein said dehydration step (c) is chemical dehydration.
Claim 12
Dependent Claim
238 words
A copolyamic acid consisting essentially of units represented by (III) and units represented by formula (IV): ##STR8## wherein R 0 is an aromatic tetracarboxylic acid residue, said copolyamic acid being prepared by a method comprising the steps of: (a) reacting the following two components: (i) an aromatic tetracarboxylic dianhydride, and (ii) a diamine component consisting essentially of at least one diamine selected from the group consisting of 4,4'-diaminodiphenyl ether and paraphenylene diamine, wherein the amount of one of said two components is in molar excess over the amount of the other of said two components, so that the resulting amic acid prepolymer is terminated with groups derived from the component which is in molar excess; and (b) reacting said amic acid prepolymer with a sufficient amount of at least one of said two components so that the total number of moles of component (i) used in steps (a) and (b) is equal to the total number of moles of component (ii) used in steps (a) and (b), provided that the diamine component added inn step (b) contains 4,4'-diaminophenyl ether if the diamine component added in step (a) does not contain 4,4'-diaminophenyl ether, and further provided that the diamine component added in step (b) contains paraphenylene diamine if the amine component added inn step (a) does not contain paraphenylene diamine, to give said copolyamic acid consisting essentially of units represented by formula (III) and units represented by formula (IV).
Claim 13
Dependent Claim
238 words
A copolyamic acid consisting essentially of units represented by (III) and units represented by formula (IV): ##STR8## wherein R 0 is an aromatic tetracarboxylic acid residue, said copolyamic acid being prepared by a method comprising the steps of: (a) reacting the following two components: (i) an aromatic tetracarboxylic dianhydride, and (ii) a diamine component consisting essentially of at least one diamine selected from the group consisting of 4,4'-diaminodiphenyl ether and paraphenylene diamine, wherein the amount of one of said two components is in molar excess over the amount of the other of said two components, so that the resulting amic acid prepolymer is terminated with groups derived from the component which is in molar excess; and (b) reacting said amic acid prepolymer with a sufficient amount of at least one of said two components so that the total number of moles of component (i) used in steps (a) and (b) is equal to the total number of moles of component (ii) used in steps (a) and (b), provided that the diamine component added inn step (b) contains 4,4'-diaminophenyl ether if the diamine component added in step (a) does not contain 4,4'-diaminophenyl ether, and further provided that the diamine component added in step (b) contains paraphenylene diamine if the amine component added inn step (a) does not contain paraphenylene diamine, to give said copolyamic acid consisting essentially of units represented by formula (III) and units represented by formula (IV).
Claim 14
Independent Claim
243 words
A method of preparing a copolyimide consisting essentially of units represented by formula (I) and units represented by formula (II): ##STR9## wherein R 0 is an aromatic tetracarboxylic residue, comprising the steps of: (a) reacting the following two components: (i) an aromatic tetracarboxylic dianhydride, and (ii) a diamine component consisting essentially of at least one diamine selected from the group consisting of 4,4'-diaminodiphenyl ether and paraphenylene diamine, wherein the amount of one of said two components is in molar excess over the amount of the other of said two components, so that the resulting amic acid prepolymer is terminated with groups derived from the component which is in molar excess; (b) reacting said amic acid prepolymer with a sufficient amount of at least one of said two components so that the total number of moles of component (i) used in steps (a) and (b) is equal to the total number of moles of component (ii) used in steps (a) and (b), provided that the diamine component added in step (b) contains 4,4'-diaminophenyl ether if the diamine component added in step (a) does not contain 4,4'-diaminophenyl ether, and further provided that the diamine component added in step (b) contains paraphenylene diamine if the amine component added in step (a) does not contain paraphenylene diamine, to give a copolyamic acid consisting essentially of units represented by formula (III) and units represented by formula (IV): ##STR10## and (c) dehydrating said polyamic acid too obtain said copolyimide.
Claim 15
Independent Claim
243 words
A method of preparing a copolyimide consisting essentially of units represented by formula (I) and units represented by formula (II): ##STR9## wherein R 0 is an aromatic tetracarboxylic residue, comprising the steps of: (a) reacting the following two components: (i) an aromatic tetracarboxylic dianhydride, and (ii) a diamine component consisting essentially of at least one diamine selected from the group consisting of 4,4'-diaminodiphenyl ether and paraphenylene diamine, wherein the amount of one of said two components is in molar excess over the amount of the other of said two components, so that the resulting amic acid prepolymer is terminated with groups derived from the component which is in molar excess; (b) reacting said amic acid prepolymer with a sufficient amount of at least one of said two components so that the total number of moles of component (i) used in steps (a) and (b) is equal to the total number of moles of component (ii) used in steps (a) and (b), provided that the diamine component added in step (b) contains 4,4'-diaminophenyl ether if the diamine component added in step (a) does not contain 4,4'-diaminophenyl ether, and further provided that the diamine component added in step (b) contains paraphenylene diamine if the amine component added in step (a) does not contain paraphenylene diamine, to give a copolyamic acid consisting essentially of units represented by formula (III) and units represented by formula (IV): ##STR10## and (c) dehydrating said polyamic acid too obtain said copolyimide.
Claim 16
Independent Claim
235 words
A method of preparing a copolyamic acid consisting essentially of units represented by formula (III) and units represented by formula (IV): ##STR11## wherein R 0 is an aromatic tetracarboxylic acid residue, comprising the steps of: (a) reacting the following two components: (i) an aromatic tetracarboxylic dianhydride, and (ii) a diamine component consisting essentially of at least one diamine selected from the group consisting of 4,4'-diaminodiphenyl ether and paraphenylene diamine, wherein the amount of one of said two components is in molar excess over the amount of the other of said two components, so that the resulting amic acid prepolymer is terminated with groups derived from the component which is in molar excess; and (b) reacting said amic acid prepolymer with a sufficient amount of at least one of said two components so that the total number of moles of component (i) used in steps (a) and (b) is equal to the total number of moles of component (ii) used in steps (a) and (b), provided that the diamine component added in step (b) contains 4,4'-diaminophenyl ether if the diamine component added in step (a) does not contain 4,4'-diaminophenyl ether, and further provided that the diamine component added in step (b) contains paraphenylene diamine if the amine component added in step (a) does not contain paraphenylene diamine, to give said copolyamic acid consisting essentially of units represented by formula (III) and units represented by formula (IV).
Claim 17
Independent Claim
235 words
A method of preparing a copolyamic acid consisting essentially of units represented by formula (III) and units represented by formula (IV): ##STR11## wherein R 0 is an aromatic tetracarboxylic acid residue, comprising the steps of: (a) reacting the following two components: (i) an aromatic tetracarboxylic dianhydride, and (ii) a diamine component consisting essentially of at least one diamine selected from the group consisting of 4,4'-diaminodiphenyl ether and paraphenylene diamine, wherein the amount of one of said two components is in molar excess over the amount of the other of said two components, so that the resulting amic acid prepolymer is terminated with groups derived from the component which is in molar excess; and (b) reacting said amic acid prepolymer with a sufficient amount of at least one of said two components so that the total number of moles of component (i) used in steps (a) and (b) is equal to the total number of moles of component (ii) used in steps (a) and (b), provided that the diamine component added in step (b) contains 4,4'-diaminophenyl ether if the diamine component added in step (a) does not contain 4,4'-diaminophenyl ether, and further provided that the diamine component added in step (b) contains paraphenylene diamine if the amine component added in step (a) does not contain paraphenylene diamine, to give said copolyamic acid consisting essentially of units represented by formula (III) and units represented by formula (IV).
References Cited (Backward Citations)
US4255313A
Cited
US4299750A
Cited
US4378400A
Cited
US4316842A
Cited
US4405770A
Cited
JPS61158025A
Cited
JPS61264028A
Cited
US4725484A
Cited
US4886874A
Cited
US4874835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-13 | 1995-07-15 | 1996-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-13 | 1999-07-15 | 2000-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-13 | 2003-07-15 | 2004-01-14 | $7700.00 | Window Closed / Lapsed |