Patent US3956241A successfully refreshed from Google Patents.
US3956241A
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Latent catalysts for epoxy resins
Assignee: Aerojet Rocketdyne Inc
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Filing: 1974-06-07
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Granted: 1976-05-11
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Expires: 1994-06-07
Abstract
Abstract Mobile mixtures of an oxirane compound and a labile hydrogen compound such as an acid, anhydride, imide or sulfonimide can be stored at long periods of time under ambient conditions in the presence of a latent chromium III chelate. At an elevated temperature, the catalyst is activated and rapidly converts the mixture into a more advanced state of cure.
Inventors
- 👤 Roger Beresford Steele
- 👤 Arthur Katzakian, Jr.
- 👤 Herman H. Weyland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:20
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/68; C08G59/70; C08G59/40; C08G59/4007; C08G59/4014; C08G59/4042
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
A method of reacting a polymerizable organic compound selected from carboxylic acids, anhydrides, imides and sulfonimides with an oxirane oxygen compound which comprises forming a mobile mixture of said compounds containing a catalytically effective amount of a chromium III chelate having a dissociation temperature above about 50°C and subsequently heating said mixture to above said temperature to react said compounds.
Claim 2
Independent Claim
60 words
A method of reacting a polymerizable organic compound selected from carboxylic acids, anhydrides, imides and sulfonimides with an oxirane oxygen compound which comprises forming a mobile mixture of said compounds containing a catalytically effective amount of a chromium III chelate having a dissociation temperature above about 50°C and subsequently heating said mixture to above said temperature to react said compounds.
Claim 3
Dependent Claim
90 words
A method according to claim 1 in which the dissociation temperature is from 50°C to 250°C and in which the chelate ligand is selected from compounds of the formula: ##EQU25## where R 1 is selected from (a) hydrogen, alkyl, aryl, cycloalkyl, and (b) hydroxy, halo, nitro and cyano derivatives of (a), R 2 and R 3 are selected from R 1 , halo, NR 1 and OR 1 and R 2 and R 1 taken together form a saturated or unsaturated hydrocarbon chain containing no more than 10 carbon atoms.
Claim 4
Dependent Claim
28 words
A method according to claim 2 in which the oxirane compound is selected from 1,2-epoxy alkanes, epoxy cyclo-alkanes and polyepoxide compounds containing a plurality of reactive 1,2-epoxy groups.
Claim 5
Dependent Claim
15 words
A method according to claim 3 in which the polymerizable compound is di- or polyfunctional.
Claim 6
Dependent Claim
42 words
A method according to claim 3 in which the imide is selected from the group consisting of succinimide, phthalimide, tetrahydrophthalimide, hexahydrophthalimide, maleimide, glutarimide, barbituric acid, cyclopentane diimide, pyromellitic diimide, benzophenonediimide, diphenylether diimide, adipimide, terephthal-diimide, benzene sulfonimide, hydantoins, amidimides and imide terminated resins.
Claim 7
Dependent Claim
30 words
A method according to claim 5 in which the mixture comprises a mobile mixture of a diimide and a polyepoxide epoxy resin and said reaction results in a cured polyimide.
Claim 8
Dependent Claim
13 words
A method according to claim 6 in which the chelate is tris-(2-acetylcyclohexanato)-Chromium (III).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |