US4038450A
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Thixotropic aqueous polyimide compositions
Assignee: Rhone Poulenc SA
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Filing: 1974-01-02
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Granted: 1977-07-26
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Expires: 1994-01-02
Abstract
Abstract Compositions are provided which consist of a solid suspension of: a. a prepolymer obtained by reacting a N,N'-bis-imide of an unsaturated dicarboxylic acid of general formula: ##STR1## in which D represents a divalent organic radical containing a carbon-carbon double bond and A represents a divalent organic radical possessing from 2 to 30 carbon atoms, and a polyamine of general formula: R (NH.sub.2).sub.x in which x represents an integer at least equal to 2 and R represents an organic radial of valency x, the bis-imide being used in an amount from 0.55 to 25 mols per mol of --NH 2 group introduced by the polyamine, suspended in: B. water, and optionally, C. a polar water-miscible organic solvent having a boiling point between 110° C and 270° C in an amount up to 50% by weight of the liquid phase. These compositions are thixotropic and useful for coating and impregnating fibrous materials and the like from which valuable resinous composites can be obtained.
Inventors
- 👤 Maurice Balme
- 👤 Jean Gattus
- 👤 Bernard Gerard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:13
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/4007; C08G59/4014; C08G59/4042; C08G73/00; C08G73/06; C08G73/10; C08G73/12; C08G73/121; C08G73/122; C08L; C08L63/00; C08L79/00; C08L79/04; C08L79/08; C08L79/085; Y; Y10; Y10T; Y10T442/00; Y10T442/20
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
212 words
A storage-stable composition which consists essentially of a thixotropic solid suspension of: a. a prepolymer having a particle size of less than 100 microns obtained by reacting, as the sole reactants, a N,N'-bis-imide of an unsaturated dicarboxylic acid of general formula: ##STR9## in which D represents a divalent organic radical containing a carbon-carbon double bond derived from an anhydride of an ethylenic dicarboxylic acid of general formula: ##STR10## and A represents a linear or branched alkylene radical having less than 13 carbon atoms, a phenylene or cyclohexylene radical or a radical of formula: ##STR11## wherein n represents an integer of from 1 to 3, or several phenylene or cyclohexylene radicals linked to one another by a valency bond or an inert atom or group, and a polyamine of general formula: R(NH.sub.2).sub.x in which x represents an integer at least equal to 2 and R represents an organic radical of valency x selected from a divalent radical as defined under A, a polyvalent benzene, naphthalene, pyridine or triazine radical or several benzene nuclei linked to one another by a valency bond or an inert atom or group, the bis-imide being used in an amount from 0.55 to 25 mols per mol of --NH 2 group introduced by the polyamine, suspended in: b. water.
Claim 2
Dependent Claim
212 words
A storage-stable composition which consists essentially of a thixotropic solid suspension of: a. a prepolymer having a particle size of less than 100 microns obtained by reacting, as the sole reactants, a N,N'-bis-imide of an unsaturated dicarboxylic acid of general formula: ##STR9## in which D represents a divalent organic radical containing a carbon-carbon double bond derived from an anhydride of an ethylenic dicarboxylic acid of general formula: ##STR10## and A represents a linear or branched alkylene radical having less than 13 carbon atoms, a phenylene or cyclohexylene radical or a radical of formula: ##STR11## wherein n represents an integer of from 1 to 3, or several phenylene or cyclohexylene radicals linked to one another by a valency bond or an inert atom or group, and a polyamine of general formula: R(NH.sub.2).sub.x in which x represents an integer at least equal to 2 and R represents an organic radical of valency x selected from a divalent radical as defined under A, a polyvalent benzene, naphthalene, pyridine or triazine radical or several benzene nuclei linked to one another by a valency bond or an inert atom or group, the bis-imide being used in an amount from 0.55 to 25 mols per mol of --NH 2 group introduced by the polyamine, suspended in: b. water.
Claim 3
Dependent Claim
39 words
A composition according to claim 1 which also contains a polar water-miscible organic solvent having a boiling poing of between 110° C. and 270° C., in an amount up to 50% by weight of the water and said solvent.
Claim 4
Dependent Claim
13 words
A composition according to claim 1 in which the organic solvent is N-methylpyrrolidone.
Claim 5
Dependent Claim
21 words
A composition according to claim 1 in which the polyamine is a di-primary diamine possessing from 2 to 30 carbon atoms.
Claim 6
Dependent Claim
28 words
A composition according to claim 1 in which the polyamine is an amine possessing less than 50 carbon atoms and 3 to 5 --NH 2 groups per molecule.
Claim 7
Dependent Claim
67 words
A composition according to claim 5 in which the polyamine in an oligomer of average formula: ##STR12## in which y represents a number from 0.1 to 2 and R' represents a divalent hydrocarbon radical having from 1 to 8 carbon atoms and derived from an aldehyde or ketone of general formula: O=R' in which the oxygen atom is bonded to a carbon atom of the radical R'.
Claim 8
Dependent Claim
20 words
A composition according to claim 1 in which the prepolymer represents from 5% to 50% by weight of the composition.
Claim 9
Dependent Claim
19 words
A composition according to claim 1 in which the prepolymer has a softening point between 50° and 200° C.
Claim 10
Dependent Claim
27 words
A composition according to claim 1 in which the polyamine is 4,4'-diamino-diphenylmethane or a polyamine as defined in claim 5 in which R represents --CH 2 --.
Claim 11
Dependent Claim
13 words
A composition according to claim 1 in which A represents a diphenylmethylene group.
Claim 12
Dependent Claim
13 words
A composition according to claim 1 in which D represents a --CH=CH-- radical.
Claim 13
Dependent Claim
60 words
A process for preparing a composition as defined in claim 1 which comprises dispersing the said prepolymer having a particle size less than 100 microns in water, optionally containing a polar water-miscible organic solvent having a boiling point of between 110° C. and 270° C. in an amount up to 50% by weight of the water and the said solvent.
Claim 14
Dependent Claim
20 words
A process according to claim 12 in which the prepolymer is prepared in the presence of a strong acid catalyst.
Claim 15
Dependent Claim
14 words
A process according to claim 13 in which the strong acid is maleic acid.
Claim 16
Dependent Claim
14 words
A fibrous material which is impregnated with a composition as claimed in claim 1.
Claim 17
Dependent Claim
38 words
A composition according to claim 1 in which D is derived from maleic anhydride, citraconic anhydride, itaconic anhydride, pyrocinchonic anhydride, dichloromaleic anhydride or a Diels-Alder reaction product of a said anhydride with an acyclic, alicyclic or heterocyclic diene.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |