Claims
- 1. A method of producing a circuit substrate having an insulating layer comprising a polyimide resin by forming a coating film of a photosensitive polyimide resin precursor on a metal foil substrate, light-exposing, heating after the light-exposure, developing, and then imidizing the precursor by heating, wherein said photosensitive polyimide resin precursor is obtained by compounding polyamic acid obtained by the reaction of
- (A) aromatic diamines comprising
- (a) p-phenylene diamine and
- (b) 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl and
- (B) 3,4,3',4'-biphenyltetracarboxylic acid dianhydride with a photosensitive agent.
- 2. The method of producing a circuit substrate of claim 1, wherein the photosensitive agent is represented by following formula (I); ##STR6## wherein X.sup.1, X.sup.2, X.sup.3, and X.sup.4 each independently represent a hydrogen atom, a fluorine atom, a nitro group, a methoxy group, an amino group, a dialkylamino group, a cyano group, or a fluorinated alkyl group; Y.sup.1 represents a cyano group or a group represented by a formula --COR.sup.3 ; Y.sup.2 represents a cyano group or a group represented by a formula --COR.sup.4 (wherein R.sup.3 and R.sup.4 each independently represent an alkyl group having from 1 to 4 carbon atoms, an alkoxy group, an anilino group, a toluidino group, a benzyloxy group, an amino group, or a dialkylamino group); R.sup.1, R.sup.2, and R.sup.3 each independently represents a hydrogen atom or an alkyl group having from 1 to 3 carbon atoms; and said R.sup.1 and R.sup.3 and said R.sup.2 and R.sup.4 each can form a ring capable of forming a 5-membered ring, a 6-membered ring, or a heterocyclic ring each containing a keto group.
- 3. The method of producing a circuit substrate of claim 1, wherein the photosensitive agent is at least one dihydropyridine derivative selected from the group consisting of 4-o-nitrophenyl-3,5-dimethoxycarbonyl-2,6-dimethyl-1,4-dihydropyridine, 4-o-nitrophenyl-3,5-diacetyl-1,4-dihydropyridine, and 4-o-nitrophenyl-3,5-dimethoxycarbonyl-2,6-dimethyl-1-methyl-4-hydropyridine.
- 4. A method of producing a circuit-formed suspension substrate comprising (1) an insulating layer comprising a polyimide resin on a metal foil substrate and (2) a pattern circuit comprising a conductive layer formed on said insulating layer by
- forming a coating film comprising a photosensitive polyimide resin precursor on a metal foil substrate,
- light-exposing,
- heating after said light-exposure,
- developing,
- imidizing said polyimide resin precursor by heating to form a circuit substrate having an insulating layer comprising a polyimide resin, and forming a pattern circuit comprising said conductive layer on said insulating layer, wherein said photosensitive polyimide resin precursor is obtained by compounding a polyamic acid obtained by the reaction of
- (A) aromatic diamines comprising
- (a) p-phenylene diamine and
- (b) 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl and
- (B) 3,4,3',4-biphenyltetracarboxylic acid dianhydride with a photosensitive agent.
- 5. The method of producing a circuit-formed suspension substrate of claim 4, wherein the photosensitive agent is represented by following formula (I); ##STR7## wherein X.sup.1, X.sup.2, X.sup.3, and X.sup.4 each independently represents a hydrogen atom, a fluorine atom, a nitro group, a methoxy group, an amino group, a dialkylamino group, a cyano group, or a fluorinated alkyl group; Y.sup.1 represents a cyano group or a group represented by a formula --COR.sup.3 ; Y.sup.2 represents a cyano group or a group represented by a formula --COR.sup.4 (wherein R.sup.3 and R.sup.4 each independently represent an alkyl group having from 1 to 4 carbon atoms, an alkoxy group, an anilino group, a toluidino group, a benzyloxy group, an amino group, or a dialkylamino group); R.sup.1, R.sup.2, and R.sup.3 each independently represent a hydrogen atom or an alkyl group having from 1 to 3 carbon atoms; and said R.sup.1 and R.sup.3 and said R.sup.2 and R.sup.4 each can form a ring capable of forming a 5-membered ring, a 6-membered ring, or a heterocyclic ring each containing a keto group.
- 6. The method of producing a circuit-formed suspension substrate of claim 4, wherein the photosensitive agent is at least one dihydropyridine derivative selected from the group consisting of 4-o-nitrophenyl-3,5-dimethoxycarbonyl-2,6-dimethyl-1,4-dihydropyridine, 4-o-nitrophenyl-3,5-diacetyl-1,4-dihydropyridine, and 4-o-nitrophenyl-3,5-dimethoxycarbonyl-2,6-dimethyl-1-methyl-4-hydropyridine.
Priority Claims (3)
Number |
Date |
Country |
Kind |
8-25616 |
Feb 1996 |
JPX |
|
8-100250 |
Apr 1996 |
JPX |
|
9-9297 |
Jan 1997 |
JPX |
|
Parent Case Info
This is a divisional of application Ser. No. 08/800,128 filed Feb. 13, 1997 abandoned.
US Referenced Citations (11)
Foreign Referenced Citations (1)
Number |
Date |
Country |
447933 |
Feb 1992 |
JPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
800128 |
Feb 1997 |
|