Claims
- 1. A process for preparing high molecular weight solid polymers having film-forming properties and being soluble in an organic solvent, which process comprises (a) reacting essentially equimolar amounts of a carbocyclic aromatic primary diamine and an acyl halide derivative of trimellitic anhydride which contains at least one acyl halide group and that in the 4-ring position, in said organic solvent, under substantially anhydrous conditions, and for a period of time and at a temperature, below 150.degree. C., controlled to produce a polymer with free carboxyl groups and amide groups available for further reaction, said polymer being soluble in said organic solvent and wherein the reaction produces hydrogen halide, and (b) washing with water said polymer.
- 2. A process of preparing cured polyamide-imide polymers which process comprises the heating of the polyamide prepared by the process of claim 1 for a period of time and at a temperature above 150.degree. C. sufficient to effectively and substantially convert such carboxyl and amide groups to imide groups, and thereby produce a polyamide-imide which is insoluble in said organic solvent.
- 3. The process of claim 1, wherein the acyl halide derivative of trimellitic anhydride is the 4-acid chloride of trimellitic anhydride.
- 4. The process of claim 3, wherein the aromatic primary diamine is p,p'-methylenebis(aniline).
- 5. The process of claim 3, wherein the aromatic primary diamine is p,p'-oxybis(aniline).
- 6. A process for preparing cured polyamide-imide polymers which process comprises the heating of the polyamide prepared by the process of claim 4 for a period of time and at a temperature above 150.degree. C. sufficient to effectively and substantially convert such carboxyl and amide groups to imide groups, and thereby produce a polyamide-imide which is insoluble in said organic solvent.
- 7. A process for preparing cured polyamide-imide polymers which process comprises the heating of the polyamide prepared by the process of claim 5 for a period of time and at a temperature above 150.degree. C. sufficient to effectively and substantially convert such carboxyl and amide groups to imide groups, and thereby produce a polyamide-imide which is insoluble in said organic solvent.
REFERENCE TO RELATED APPLICATIONS
This is a continuation of application Ser. No. 596,765, filed Nov. 25, 1966, issued as U.S. Pat. No. 3,920,612 (1975), which is in turn a continuation-in-part of Ser. No. 252,557, filed Jan. 21, 1963 (abandoned), Ser. No. 336,857, filed Jan. 10, 1964 (abandoned), and Ser. No. 535,367, filed Mar. 18, 1966 (abandoned).
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3347828 |
Stephens et al. |
Oct 1967 |
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3920612 |
Stephens |
Nov 1975 |
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Related Publications (2)
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Date |
Country |
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336857 |
Jan 1964 |
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535367 |
Mar 1966 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
596765 |
Nov 1966 |
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Continuation in Parts (1)
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Number |
Date |
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Parent |
252557 |
Jan 1963 |
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