Patent EP0276405A2 successfully refreshed from Google Patents.
EP0276405A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Polyimide having a thermal dimensional stability
Assignee: Kanegafuchi Chemical Industry Co Ltd
•
Filing: 1987-11-27
•
Granted: —
•
Expires: 2007-11-27
Abstract
Abstract The present invention provides a copolyimide characterized in that the copolyimide contains units represented by formulas (I) and (II) (wherein R₀ 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
EP
Data Source
google_patents
Last Synchronized
2026-10-31 21:52
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: 16
Claim 1
Independent Claim
94 words
A copolyimide containing units represented by formulas (I) and (II): (wherein R₀ is an aromatic tetracarboxylic residue) and is prepared by use of a method comprising the steps of: (a) synthesizing an amic acid prepolymer of acid anhydride group terminals or amino group terminals, by reacting an aromatic tetracarboxylic dianhydride with a diamine containing 4,4ʹ-diaminodiphenyl ether and/or paraphenylene diamine at a nonequimolar ratio; (b) synthesizing polyamic acid by using the amic acid prepolymer as part or all of the diamine or the acid anhydride; and (c) synthesizing the polyimide by dehydrating the polyamic acid.
Claim 2
Dependent Claim
94 words
A copolyimide containing units represented by formulas (I) and (II): (wherein R₀ is an aromatic tetracarboxylic residue) and is prepared by use of a method comprising the steps of: (a) synthesizing an amic acid prepolymer of acid anhydride group terminals or amino group terminals, by reacting an aromatic tetracarboxylic dianhydride with a diamine containing 4,4ʹ-diaminodiphenyl ether and/or paraphenylene diamine at a nonequimolar ratio; (b) synthesizing polyamic acid by using the amic acid prepolymer as part or all of the diamine or the acid anhydride; and (c) synthesizing the polyimide by dehydrating the polyamic acid.
Claim 3
Dependent Claim
31 words
A copolyimide according to claim 1, characterized in that a molar ratio of the aromatic tetracarboxylic dianhydride in step (a) is lower than that of the diamine used in step (a).
Claim 4
Dependent Claim
56 words
A copolyimide according to claim 2, characterized in that an amount of the diamine used in step (a) is 10 to 90 mol% of the diamine used in steps (a) to (c), and an amount of the aromatic tetracarboxylic dianhydride used in step (a) is 40 to 99 mol% of the diamine used in step (a).
Claim 5
Dependent Claim
31 words
A copolyimide according to claim 1, characterized in that the molar ratio the aromatic tetracarboxylic dianhydride used in step (a) is higher than that of the diamine used in step (a).
Claim 6
Dependent Claim
18 words
A copolyimide according to claim 1, characterized in that the diamine used in step (a) is 4,4ʹ-diaminodiphenyl ether.
Claim 7
Dependent Claim
18 words
A copolyimide according to claim 1, characterized in that the diamine used in step (a) is paraphenylene diamine.
Claim 8
Dependent Claim
31 words
A copolyimide according to claim 1, characterized in that a total molar ratio of the unit represented by formula (I) to the unit represented by formula (II) is 1/9 to 9/1.
Claim 9
Dependent Claim
16 words
A copolyimide according to claim 1, characterized in that the aromatic tetracarboxylic dianhydride is pyromellitic dianhydride.
Claim 10
Dependent Claim
18 words
A copolyimide according to claim 1, characterized in that dehydration in step (c) is thermal or chemical dehydration.
Claim 11
Dependent Claim
86 words
A copolyamic acid containing units represented by formulas (III) and (IV): (wherein R₀ is an aromatic tetracarboxylic residue) and is prepared by use of a method comprising the steps of: (a) synthesizing an amic acid prepolymer of acid anhydride group terminals or amino group terminals, by reacting an aromatic tetracarboxylic dianhydride with a diamine containing 4,4ʹ-diaminodiphenyl ether and/or paraphenylene diamine at a nonequimolar ratio; and (b) synthesizing polyamic acid by using the amic acid prepolymer as part or all of the diamine or the acid anhydride.
Claim 12
Dependent Claim
86 words
A copolyamic acid containing units represented by formulas (III) and (IV): (wherein R₀ is an aromatic tetracarboxylic residue) and is prepared by use of a method comprising the steps of: (a) synthesizing an amic acid prepolymer of acid anhydride group terminals or amino group terminals, by reacting an aromatic tetracarboxylic dianhydride with a diamine containing 4,4ʹ-diaminodiphenyl ether and/or paraphenylene diamine at a nonequimolar ratio; and (b) synthesizing polyamic acid by using the amic acid prepolymer as part or all of the diamine or the acid anhydride.
Claim 13
Independent Claim
90 words
A method of preparing a copolyimide containing units represented by formulas (I) and (II): (wherein R₀ is an aromatic tetracarboxylic residue) comprising the steps of: (a) synthesizing an amic acid prepolymer of acid anhydride group terminals or amino group terminals, by reacting an aromatic tetracarboxylic dianhydride with a diamine containing 4,4ʹ-diaminodiphenyl ether and/or paraphenylene diamine at a nonequimolar ratio; (b) synthesizing polyamic acid by using the amic acid prepolymer as part or all of the diamine or the acid anhydride; and (c) synthesizing the polyimide by dehydrating the polyamic acid.
Claim 14
Independent Claim
90 words
A method of preparing a copolyimide containing units represented by formulas (I) and (II): (wherein R₀ is an aromatic tetracarboxylic residue) comprising the steps of: (a) synthesizing an amic acid prepolymer of acid anhydride group terminals or amino group terminals, by reacting an aromatic tetracarboxylic dianhydride with a diamine containing 4,4ʹ-diaminodiphenyl ether and/or paraphenylene diamine at a nonequimolar ratio; (b) synthesizing polyamic acid by using the amic acid prepolymer as part or all of the diamine or the acid anhydride; and (c) synthesizing the polyimide by dehydrating the polyamic acid.
Claim 15
Independent Claim
82 words
A method of preparing a copolyamic acid containing units represented by formulas (III) and (IV): (wherein R₀ is an aromatic tetracarboxylic residue) comprising the steps of: (a) synthesizing an amic acid prepolymer of acid anhydride group terminals or amino group terminals, by reacting an aromatic tetracarboxylic dianhydride with a diamine containing 4,4ʹ-diaminodiphenyl ether and/or paraphenylene diamine at a nonequimolar ratio; and (b) synthesizing polyamic acid by using the amic acid prepolymer as part or all of the diamine or the acid anhydride.
Claim 16
Independent Claim
82 words
A method of preparing a copolyamic acid containing units represented by formulas (III) and (IV): (wherein R₀ is an aromatic tetracarboxylic residue) comprising the steps of: (a) synthesizing an amic acid prepolymer of acid anhydride group terminals or amino group terminals, by reacting an aromatic tetracarboxylic dianhydride with a diamine containing 4,4ʹ-diaminodiphenyl ether and/or paraphenylene diamine at a nonequimolar ratio; and (b) synthesizing polyamic acid by using the amic acid prepolymer as part or all of the diamine or the acid anhydride.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.