Patent US3894977A successfully refreshed from Google Patents.
US3894977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealant composition
Assignee: Southern Line Cleaning Inc
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Filing: 1973-08-27
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Granted: 1975-07-15
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Expires: 1993-08-27
Abstract
Abstract A liquid epoxy pipe line sealing tercopolymer composition suitable for application in underground pipe lines by trowel or centrifugal force through a rotating nozzle has a pot life of at least 2 hours or more and gels within about 10 to 48 hours, curing in full within about 10 days. The composition contains about 50-85% epoxy resin, 5-35% polysulfide polymer, 1.5-10% amine curing agent and 2-15% inert filler. The sealant can have up to 5% of an inhibitor in the form of an unpolymerized fatty acid. Preferably, dimerized and/or trimerized acids are polymerized in situ and function as pot life extenders and/or flexing agents, when used in amounts up to about 30% with the non-protonated epoxy base and about the same amount with the protonated epoxy acid. These acids replace an equal amount of polysulfide polymer.
Inventors
- 👤 George A Brown
- 👤 Francis Michael Hinds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:23
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/56; C08G59/58; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/16; C08K5/17; C08L; C08L63/00; C08L81/00; C08L81/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
A LIQUID OF SEMILIQUID PIPE LINE SEALING COMPOSITION FOR APPLICATION IN UNDERGROUND PIPE LINES, SAID COMPOSITION COMPRISING ABOUT 50-85% OF A LIQUID EPOXY RESIN, 1.5-10% OF AN AMINE CURING AGENT, 2-15% OF INERT FILLER, AT LEAST 5% OF A LIQUID UNCURED POLYSULFIDE POLYMER AND 7-12% OF A DIMER AND/OR TRIMER ACID, WITH THE PROVISO THAT THE OTAL POLYSULFIDE POLYMER AND DIMER AND/OR TRIMER CID CONTENT IS 35% OF LESS, SAID COMPOSITION HAVING A POT LIFE OF MORE THAN 2 HOURS AND A GELLATION PERIOD OF 10-48 HOURS.
Claim 2
Dependent Claim
87 words
A LIQUID OF SEMILIQUID PIPE LINE SEALING COMPOSITION FOR APPLICATION IN UNDERGROUND PIPE LINES, SAID COMPOSITION COMPRISING ABOUT 50-85% OF A LIQUID EPOXY RESIN, 1.5-10% OF AN AMINE CURING AGENT, 2-15% OF INERT FILLER, AT LEAST 5% OF A LIQUID UNCURED POLYSULFIDE POLYMER AND 7-12% OF A DIMER AND/OR TRIMER ACID, WITH THE PROVISO THAT THE OTAL POLYSULFIDE POLYMER AND DIMER AND/OR TRIMER CID CONTENT IS 35% OF LESS, SAID COMPOSITION HAVING A POT LIFE OF MORE THAN 2 HOURS AND A GELLATION PERIOD OF 10-48 HOURS.
Claim 3
Dependent Claim
15 words
The composition of claim 1 wherein the epoxy resin is an epichlorohydrin type base epoxy.
Claim 4
Dependent Claim
27 words
The composition of claim 1 wherein there is about 55-70% resin, 10-25% polysulfide polymer, 2-8% amine curing agent, 7-15% inert filler and 7-12% dimer and/or trimer acid.
Claim 5
Independent Claim
82 words
A method of prolonging the pot life and retarding the gel and cure time of a cureable sealing composition having 50-85% epichlorohydrin epoxy resin, at least 5% uncured polysulfide polymer, and 1.5-10% of an amine curing agent, comprising the step of blending into the composition a dimer and/or trimer acid, the amount of the acid being one-half to five times the amount of amine present in the composition and, together with the polysulfide polymer, totaling 35% or less of the final composition.
Claim 6
Independent Claim
82 words
A method of prolonging the pot life and retarding the gel and cure time of a cureable sealing composition having 50-85% epichlorohydrin epoxy resin, at least 5% uncured polysulfide polymer, and 1.5-10% of an amine curing agent, comprising the step of blending into the composition a dimer and/or trimer acid, the amount of the acid being one-half to five times the amount of amine present in the composition and, together with the polysulfide polymer, totaling 35% or less of the final composition.
Claim 7
Dependent Claim
12 words
The method of claim 4, wherein the amine is a tertiary amine.
Claim 8
Dependent Claim
17 words
The method of claim 4 wherein about 10-25% of the polysulfide polymer is present in the composition.
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) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |