US4331582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy latent catalyst
Assignee: Cytec Technology Corp
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Filing: 1980-01-14
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Granted: 1982-05-25
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Expires: 2000-01-14
Abstract
Abstract A catalyst for forming ambient temperature stable diamino-diphenyl sulfone-epoxy composition comprises the half-salt of a strong aromatic sulfonic acid such as toluene sulfonic acid and an imidazole, preferably an alkylated imidazole such as 2-ethyl-4-methylimidazole. The composition fully cures at moderate temperature to form a humidity resistant resin having a high heat distortion temperature and can be impregnated onto reinforcing fibers such as graphite to form composites.
Inventors
- 👤 Eduard P. Babayan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:58
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/5033; C08G59/4007; C08G59/4064; C08G59/5093; C08G59/56; C08G59/68; C08G59/687; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249994; Y10T428/249998
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
105 words
A curable composition having an extended pot life at temperatures below 200 degrees F. comprising: 0.25% to 10% by weight of a half-salt of an imidazole and a strong aromatic acid soluble in epoxy selected from benzene sulfonic acid or alkylated benzene sulfonic acid containing 1 to 3 C 1 to C 8 alkyl groups, said imidazole being selected from compounds of the formula; ##STR5## where R 1 , R 2 and R 3 are selected from hydrogen, alkyl, aralkyl, hydroxyalkyl, cyanoalkyl and phenyl; 10% to 35% by weight of a diamino-diphenyl sulfone; and remainder being an organic material containing a plurality of epoxy groups.
Claim 2
Dependent Claim
105 words
A curable composition having an extended pot life at temperatures below 200 degrees F. comprising: 0.25% to 10% by weight of a half-salt of an imidazole and a strong aromatic acid soluble in epoxy selected from benzene sulfonic acid or alkylated benzene sulfonic acid containing 1 to 3 C 1 to C 8 alkyl groups, said imidazole being selected from compounds of the formula; ##STR5## where R 1 , R 2 and R 3 are selected from hydrogen, alkyl, aralkyl, hydroxyalkyl, cyanoalkyl and phenyl; 10% to 35% by weight of a diamino-diphenyl sulfone; and remainder being an organic material containing a plurality of epoxy groups.
Claim 3
Dependent Claim
94 words
A curable composition having an extended pot life at temperatures below 200 degrees F. comprising: 0.25% to 10% by weight of a half-salt of an imidazole and a strong aromatic sulfonic acid soluble in epoxy, said imidazole being selected from compounds of the formula; ##STR6## where R 1 , R 2 and R 3 are selected from hydrogen, alkyl, aralkyl, hydroxyalkyl, cyanoalkyl and phenyl; 10% to 35% by weight of a diamino-diphenyl sulfone; and remainder being an organic material containing a plurality of epoxy groups selected from epoxidized novolac and epoxidized alkylene dianiline materials.
Claim 4
Dependent Claim
94 words
A curable composition having an extended pot life at temperatures below 200 degrees F. comprising: 0.25% to 10% by weight of a half-salt of an imidazole and a strong aromatic sulfonic acid soluble in epoxy, said imidazole being selected from compounds of the formula; ##STR6## where R 1 , R 2 and R 3 are selected from hydrogen, alkyl, aralkyl, hydroxyalkyl, cyanoalkyl and phenyl; 10% to 35% by weight of a diamino-diphenyl sulfone; and remainder being an organic material containing a plurality of epoxy groups selected from epoxidized novolac and epoxidized alkylene dianiline materials.
Claim 5
Dependent Claim
15 words
A composition according to claim 2 in which the material is an epoxidized methylene dianiline.
Claim 6
Dependent Claim
16 words
A composition according to claim 3 in which the material is tetraglycidyl ether of methylene dianiline.
Claim 7
Dependent Claim
14 words
A composition according to claim 4 in which the acid is toluene sulfonic acid.
Claim 8
Dependent Claim
26 words
A composition according to claim 4 in which the imidazole is a 2,4-dialkyl imidazole in which the alkyl groups contain from 1 to 6 carbon atoms.
Claim 9
Dependent Claim
13 words
A composition according to claim 6 in which the imidazole is 2-ethyl-4 methylimidazole.
Claim 10
Dependent Claim
22 words
A composite material comprising in combination; 30% to 70% by weight of reinforcing fiber and remainder being the composition of claim 1.
Claim 11
Dependent Claim
14 words
A composite according to claim 8 in the form of sheets of prepreg material.
Claim 12
Dependent Claim
18 words
A composite according to claim 9 in which the fiber is selected from fiberglass, carbon and graphite fibers.
Claim 13
Dependent Claim
80 words
A composition of matter comprising an organic material containing a plurality of epoxy groups having dissolved therein, and the half-salt of a strong aromatic sulfonic acid selected from benzene sulfonic acid or alkylated benzene sulfonic acid containing 1 to 3 C 1 to C 8 alkyl groups, said sulfonic acid being soluble in epoxy and an imidazole of the formula: ##STR7## where R 1 , R 2 and R 3 are selected from hydrogen, alkyl, aralkyl, hydroxyalkyl, cyanoalkyl and phenyl.
Claim 14
Dependent Claim
80 words
A composition of matter comprising an organic material containing a plurality of epoxy groups having dissolved therein, and the half-salt of a strong aromatic sulfonic acid selected from benzene sulfonic acid or alkylated benzene sulfonic acid containing 1 to 3 C 1 to C 8 alkyl groups, said sulfonic acid being soluble in epoxy and an imidazole of the formula: ##STR7## where R 1 , R 2 and R 3 are selected from hydrogen, alkyl, aralkyl, hydroxyalkyl, cyanoalkyl and phenyl.
Claim 15
Dependent Claim
14 words
A composition according to claim 11 in which the acid is toluene sulfonic acid.
Claim 16
Dependent Claim
26 words
A composition according to claim 12 in which the imidazole is a 2,4-dialkyl imidazole in which the alkyl groups contain from 1 to 6 carbon atoms.
Claim 17
Dependent Claim
13 words
A composition according to claim 13 in which the imidazole is 2-ethyl-4 methylimidazole.
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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) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |