Patent US3903048A successfully refreshed from Google Patents.
US3903048A
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Catalyst systems for lowering epoxy resin cure temperatures
Assignee: Braskem America Inc
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Filing: 1973-04-02
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Granted: 1975-09-02
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Expires: 1993-04-02
Abstract
Abstract New structural adhesives are disclosed in which an epoxy resin is cured with dicyandiamide. The curing of the epoxy resin by dicyandiamide is accelerated by the addition of appropriate amounts of organic compounds containing certain active groups such as SCN, NH, NH2, SH, N, or CN, in combination with azo, hydroxyl, H:N, or sulfur groups.
Inventors
- 👤 Andrew D Lombardi
- 👤 Thomas W Smeal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:17
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/68; C08G59/687; C08G59/40; C08G59/4007; C08G59/4014; C08G59/4021
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
51 words
A COMPOSITION COMPRISING A 1,2-EPOXY ETHER RESIN HAVING AN EPOXY EQUIVALENCY GREATER THAN ONE, FROM ABOUT ONE TO ABOUT TWENTY PERCENT DICYANDIAMIDE, AND FROM ABOUT ONE TO ABOUT TEN PERCENT OF AN ACCELERATOR SELECTED FROM THE GROUP CONSISTING OF DIMETHYL DITHIOCARBAMIC ACID DIMETHYLAMMONIUM SALT, BIS(DIMETHYLTHIOCARBAMY) SULFIDE, TETRAMETHYLTHIURAM DISULFIDE, AND TETRAETHYLTHIURAM DISULFIDE.
Claim 2
Dependent Claim
51 words
A COMPOSITION COMPRISING A 1,2-EPOXY ETHER RESIN HAVING AN EPOXY EQUIVALENCY GREATER THAN ONE, FROM ABOUT ONE TO ABOUT TWENTY PERCENT DICYANDIAMIDE, AND FROM ABOUT ONE TO ABOUT TEN PERCENT OF AN ACCELERATOR SELECTED FROM THE GROUP CONSISTING OF DIMETHYL DITHIOCARBAMIC ACID DIMETHYLAMMONIUM SALT, BIS(DIMETHYLTHIOCARBAMY) SULFIDE, TETRAMETHYLTHIURAM DISULFIDE, AND TETRAETHYLTHIURAM DISULFIDE.
Claim 3
Dependent Claim
17 words
Composition of claim 1 in which the epoxy resin is a polyglycidyl ether of a polyhydric phenol.
Claim 4
Dependent Claim
25 words
Composition of claim 1 in which the epoxy resin is a polyglycidyl ether of bisphenol A having an epoxy equivalent weight of 170 to 1200.
Claim 5
Dependent Claim
44 words
A curable composition of matter consisting essentially of a. a polyepoxide whose molecule contains on an average more than one 1,2-epoxide groups; b. dicyandiamide as curing agent, and c. as curing accelerator 0.1 to about 10 percent of a composition of the formula (((CH3)2NCS)2S).
Claim 6
Dependent Claim
44 words
A curable composition of matter consisting essentially of a. a polyepoxide whose molecule contains on an average more than one 1,2-epoxide groups; b. dicyandiamide as curing agent, and c. as curing accelerator 0.1 to about 10 percent of a composition of the formula (((CH3)2NCS)2S).
Claim 7
Dependent Claim
44 words
A curable composition of matter consisting essentially of a. a polyepoxide whose molecule contains on an average more than one 1,2-epoxide groups; b. dicyandiamide as curing agent; and c. as curing accelerator 0.1 to about 10 percent of a composition of the formula (((CH3)2NCS)2S2).
Claim 8
Dependent Claim
44 words
A curable composition of matter consisting essentially of a. a polyepoxide whose molecule contains on an average more than one 1,2-epoxide groups; b. dicyandiamide as curing agent; and c. as curing accelerator 0.1 to about 10 percent of a composition of the formula (((CH3)2NCS)2S2).
Claim 9
Dependent Claim
44 words
A curable composition of matter consisting essentially of a. a polyepoxide whose molecule contains on an average more than one 1,2-epoxide groups; b. dicyandiamide as curing agent; and c. as curing accelerator 0.1 to about 10 percent of a composition of the formula ((CH3)2NCSSNH2(CH3)2).
Claim 10
Dependent Claim
44 words
A curable composition of matter consisting essentially of a. a polyepoxide whose molecule contains on an average more than one 1,2-epoxide groups; b. dicyandiamide as curing agent; and c. as curing accelerator 0.1 to about 10 percent of a composition of the formula ((CH3)2NCSSNH2(CH3)2).
Claim 11
Independent Claim
55 words
A method of accelerating the rate of curing of a 1,2-epoxy ether resin having an epoxy equivalency Greater than one with dicyandiamide comprising adding to the epoxy resin-dicyandiamide composition from 0.1 to about 10 percent of an accelerator selected from the group consisting of dimethyldithiocarbamic acid dimethylammonium salt, bis(dimethylthiocarbamyl) sulfide, tetramethylthiuram disulfide, and tetraethylthiuram disulfide.
Claim 12
Independent Claim
55 words
A method of accelerating the rate of curing of a 1,2-epoxy ether resin having an epoxy equivalency Greater than one with dicyandiamide comprising adding to the epoxy resin-dicyandiamide composition from 0.1 to about 10 percent of an accelerator selected from the group consisting of dimethyldithiocarbamic acid dimethylammonium salt, bis(dimethylthiocarbamyl) sulfide, tetramethylthiuram disulfide, and tetraethylthiuram disulfide.
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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |