Claims
- 1. A method of bonding two smooth surfaces together which comprises the steps of:
- providing a quantity of a solvent;
- adding thereto in either order, an aromatic tetracarboxylic acid dianhydride and from just above 0 to 10 moles of an oxoimine per mole of said dianhydride, said oxoimine having the general structure. ##STR4## where x is 4 to 7; maintaining the resulting mixture at a temperature of from about 30.degree. to 120.degree. C.;
- stirring said mixture until solution is complete;
- cooling the resulting solution to a temperature of from about 20.degree. to 60.degree. C.;
- adding thereto about 1.0 moles of a diamine per mole of dianhydride; and
- stirring until solution is complete producing an imide precurser solution;
- forming a coating of said imide precurser solution on at least one of two smooth surfaces to be bonded together;
- drying said coating;
- pressing said surfaces together with said coating therebetween; and
- heating the resulting assembly at a temperature of about 200.degree. to 300.degree. C. for from about 30 minutes to 5 hours.
- 2. The product produced according to the method of claim 1.
- 3. The method according to claim 1 wherein said imide precurser is coated and dried onto both surfaces to be bonded together.
- 4. The method according to claim 1 further including the steps, before coating said at least one surface of;
- drying said imide precurser solution to a powder;
- storing said powder for a selected period; and
- spreading a substantially uniform layer of said powder on said at least one surface prior to pressing said surfaces together.
- 5. The method according to claim 1 further including the steps, before coating said at least one surface, of;
- drying said imide precurser solution to a powder;
- storing said powder for a selected period;
- dissolving said powder in a solvent after said storage; and
- spreading the resulting solution on said at least on surface prior to pressing said surfaces together.
- 6. The method according to claim 1 further including the step of adding to said imide precurser solution up to about 0.1 molecular parts of an adhesion promoter per molecular part diamine.
- 7. The method according to claim 1 wherein said aromatic tetracarboxylic acid dianhydride is selected from the group consisting of 3,3',4,4'-benzophenone tetracarboxylic acid dianhydride, pyromellitic dianhydride, and mixtures thereof.
- 8. The method according to claim 1 wherein the ratio of oxomine to dianhydride is from just above 0 to 1 and said oxoimine is selected from the group consisting of caprolactam, 2-pyrrolidone or 2-piperidone and mixtures thereof.
- 9. The method according to claim 1 wherein said oxomine is caprolactam and said dianhydride is 3,3',4,4'-benzophenone tetracarboxylic acid dianhydride.
- 10. The method according to claim 1 wherein said solvent is dimethyl formamide, and said diamine is 4,4'-diaaminodiphenyl methone.
Parent Case Info
This is a division of application Ser. No. 682,574 filed 12/17/84, now U.S. Pat. No. 4,601,908.
US Referenced Citations (4)
Divisions (1)
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Number |
Date |
Country |
Parent |
682574 |
Dec 1984 |
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