Claims
- 1. A low density, resilient, flame resistant modified polyimide foam product obtained according to the following method steps:
- reacting an aromatic dianhydride with an effective amount of an oxoimine having the general formula ##STR8## where "x" is an integer from 1 to 5, in a mole ratio of oxime to dianhydride up to about 1.5:1 to produce an N-substituted aliphatic imide;
- dissolving said imide in a reactive solvent esterfying agent to exterify said imide;
- adding thereto a diamine;
- drying the resulting solution to produce a powdered prepolymer;
- blending with said powdered prepolymer from about 0.05 to 10 wt. %, based on prepolymer weight, of a hydrated compound which is stable up to at least about 100.degree. C.; and
- heating the blended material to a selected foaming temperature of from about 120.degree. C. to about 320.degree. C. for a period of from about 10 to about 60 minutes.
- 2. A foamable material capable of expanding into a low density, resilient, flame resistant modified polyimide foam product, obtained according to the following method:
- reacting an aromatic dianhydride with an effective amount of an oxoimine having the general formula ##STR9## where "x" is an integer from 1 to 5, in a mole ratio of oxime to dianhydride up to about 1.5:1 to produce an N-substituted aliphatic imide;
- dissolving said imide in a reactive solvent esterfying agent to esterify said imide;
- adding thereto a diamine; and
- drying the resulting solution.
- 3. The product of claim 2 further including the step of:
- blending with the powdered prepolymer from about 0.05 to 10 wt. % based on prepolymer weight, of a hydrated compound which is stable up to at least about 100.degree. C.
Parent Case Info
This is a division of application Ser. No. 549,618, filed Nov. 7, 1983.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4425441 |
Gagliani et al. |
Jan 1984 |
|
4426463 |
Gagliani et al. |
Jan 1984 |
|
Divisions (1)
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Number |
Date |
Country |
Parent |
549618 |
Nov 1983 |
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