US4048144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of solid polymers from aromatic primary diamine and acyl halide of trimellitic anhydride
Assignee: BP Corp North America Inc
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Filing: 1975-08-04
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Granted: 1977-09-13
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Expires: 1995-08-04
Abstract
Abstract A process for preparing high molecular weight solid polymers, which process comprises reacting essentially equal molar amounts of a carbocylic aromatic primary diamine and an acyl halide derivative of trimellitic anhydride under essentially anhydrous conditions for a period of time and at a temperature controlled to produce a polymer with free carboxyl groups and amide groups available for further reaction. Also, a process for preparing cured polyamine-imide polymers which comprises heating of the soluble polymers prepared as aforementioned at a temperature above 150° C. sufficient to effectively and substantially convert said carboxyl and amide groups to imide groups and thereby produce a polyamine-imide which is insoluble in organic polar solvents.
Inventors
- 👤 James R. Stephens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:54
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/307; C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12; C08G73/121; C08G73/14; H01B3/303; H01B3/306; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721; Y10T428/31725
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
114 words
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° 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.
Claim 2
Dependent Claim
114 words
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° 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.
Claim 3
Dependent Claim
60 words
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° 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.
Claim 4
Dependent Claim
20 words
The process of claim 1, wherein the acyl halide derivative of trimellitic anhydride is the 4-acid chloride of trimellitic anhydride.
Claim 5
Dependent Claim
12 words
The process of claim 3, wherein the aromatic primary diamine is p,p'-methylenebis(aniline).
Claim 6
Dependent Claim
12 words
The process of claim 3, wherein the aromatic primary diamine is p,p'-oxybis(aniline).
Claim 7
Dependent Claim
60 words
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° 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.
Claim 8
Dependent Claim
60 words
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° 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.
References Cited (Backward Citations)
US3920612A
Cited
US3347828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |