Claims
- 1. A liquid polyimide foam precursor composition suitable for use in the manufacture of non-friable polyimide foams, prepared by esterifying an aromatic dianhydride with an esterifying solvent of produce a half-ester and reacting said half-ester with a diamine to produce a polyimide precursor composition;
- the improvement wherein:
- said diamine consists of a mixture of at least one aromatic-aliphatic diamine and from 0.1 to 50 mole % of at least one aliphatic diamine;
- said aromatic-aliphatic diamine having the general formula: ##STR2## wherein x is a positive integer from 1 to 20; and
- said aliphatic diamine has the general formula:
- H.sub.2 N--(CH.sub.2).sub.y --NH.sub.2
- wherein
- y is a positive integer from 2 to 12.
- 2. A dry polyimide foam precursor composition suitable for use in the manufacture of non-friable polyimide foams, prepared by esterifying an aromatic dianhydride with an esterifying solvent of produce a half-ester and reacting said half-ester with a diamine to produce a polyimide precursor composition drying said polyimide precursor composition and pulverizing the resulting dry material to a powder;
- the improvement wherein:
- said diamine consists of a mixture of at least one aromatic-aliphatic diamine and from 0.1 to 50 mole % of at least one aliphatic diamine;
- said aromatic-aliphatic diamine having the general formula: ##STR3## wherein x is a positive integer from 1 to 20; and
- said aliphatic diamine has the general formula:
- H.sub.2 N--(CH.sub.2).sub.y --NH.sub.2
- wherein
- y is a positive integer from 2 to 12.
- 3. A non-friable resilient, flame resistant polyimide foam prepared by esterifying an aromatic dianhydride with an esterifying solvent of produce a half-ester and reacting said half-ester with a diamine to produce a polyimide precursor composition drying said polyimide precursor composition, pulverizing the resulting dry material to a powder and heating said powder to cause melting and foaming of said powder as the polymerization reaction is completed;
- the improvement wherein:
- said diamine consists of a mixture of at least one aromatic-aliphatic diamine and from 0.1 to 50 mole % of at least one aliphatic diamine;
- said aromatic-aliphatic diamine having the general formula: ##STR4## wherein x is a positive integer from 1 to 20; and
- said aliphatic diamine has the general formula:
- H.sub.2 N--(CH.sub.2).sub.y --NH.sub.2
- wherein
- y is a positive integer from 2 to 12.
Parent Case Info
This is a division, of application Ser. No. 705,129, filed 02/25/85.
US Referenced Citations (9)
Divisions (1)
|
Number |
Date |
Country |
Parent |
705129 |
Feb 1985 |
|