Claims
- 1. A screen printing ink which comprises a polyimide precursor composition having a thixotropic property and which is produced by (i) providing a polyamide acid solution obtained by reacting an aromatic tetracarboxylic acid component, a diamine component and a maleimide compound in the presence of an oxygen-containing solvent and (ii) subjecting said polyamide acid solution to heat treatment.
- 2. A screen printing ink according to claim 1, wherein the maleimide compound is a fluorine-containing bismaleimide compound and said fluorine-containing bismaleimide compound is used in an amount corresponding to 5 to 30 wt. % versus the total amount of the aromatic tetracarboxylic acid component and the diamine component.
- 3. A screen printing ink according to claim 1, wherein the aromatic tetracarboxylic acid component comprises a compound (a) selected from the group consisting of benzenetetracarboxylic acid dianhydride (a-i), biphenyltetracarboxylic acid dianhydride (a-ii), terphenyltetracarboxylic acid dianhydride (a-iii), benzophenonetetracarboxylic acid dianhydride (a-iv) and reactive esters derived from said dianhydrides (a-i) to (a-iv), and a compound (b) selected from the group consisting of tetracarboxylic acid dianhydrides (b-i) other than said dianhydrides (a-i) to (a-iv) and reactive esters derived from said dianhydrides (b-i); the diamine component comprises a compound (c) selected from the group consisting of 2,2'-bis (trifluoromethyl)diaminodiphenyl compound (c-i) and reactive esters derived from said compound (c-i), and a compound (d) selected from siloxydiamine compounds; the maleimide compound comprises a compound (e) selected from the group consisting of fluorine-containing bismaleimide compounds; and the oxygen-containing solvent has a boiling point of 180.degree. C. to 300.degree. C.
- 4. A screen printing ink according to claim 1 which is used for obtaining a polyimide composition material by applying said screen printing ink on a substrate by means of screen printing, and subjecting said screen printing ink disposed on said substrate to baking treatment.
- 5. A screen printing ink according to claim 1 which is used in a screen printing method.
- 6. A process for producing a screen printing ink comprising a polyimide precursor composition having a thixotropic property, said process comprising the steps of:
- reacting an aromatic tetracarboxylic acid component, a diamine component and a maleimide compound in the presence of an oxygen-containing solvent to obtain a polyamide acid solution, and
- subjecting said polyamide acid solution to heat treatment.
- 7. A process according to claim 6, wherein the heat treatment is conducted at a temperature of 60.degree. C. to 100.degree. C.
- 8. A process according to claim 6, wherein the aromatic tetracarboxylic acid component comprises a compound (a) selected from the group consisting of benzenetetracarboxylic acid dianhydride (a-i), biphenyltetracarboxylic acid dianhydride (a-ii), terphenyltetracarboxylic acid dianhydride (a-iii), benzophenonetetracarboxylic acid dianhydride (a-iv) and reactive esters derived from said dianhydrides (a-i) to (a-iv), and a compound (b) selected from the group consisting of tetracarboxylic acid dianhydrides (b-i) other than said dianhydrides (a-i) to (a-iv) and reactive esters derived from said dianhydrides (b-i); the diamine component comprises a compound (c) selected from the group consisting of 2,2'-bis (trifluoromethyl)diaminodiphenyl compound (c-i) and reactive esters derived from said compound (c-i), and a compound (d) selected from siloxydiamine compounds; the maleimide compound comprises a compound (e) selected from the group consisting of fluorine-containing bismaleimide compounds; and the oxygen-containing solvent has a boiling point of 180.degree. C. to 300.degree. C.
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-296992 |
Nov 1993 |
JPX |
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Parent Case Info
This application is a division of now abandoned application Ser. No. 346,227, filed Nov. 22, 1994.
US Referenced Citations (10)
Divisions (1)
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Number |
Date |
Country |
Parent |
346227 |
Nov 1994 |
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