US4061579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intumescent coatings containing 4,4'-dinitrosulfanilide
Assignee: National Aeronautics and Space Administration
•
Filing: 1976-10-22
•
Granted: 1977-12-06
•
Expires: 1996-10-22
Abstract
Abstract An intumescent composition, which comprises a mixture of 4,4'-dinitrosulfanilide as the intumescent agent in a polymer binder mixture of a chlorinated polyolefin, a bisphenol A epoxy resin and a rubber-like amine hardener.
Inventors
- 👤 Paul M. Sawko
- 👤 Salvatore R. Riccitiello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:18
CPC Classifications
C; C09; C09D; C09D123/00; C09D123/26; C09D123/28; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/54; C09D163/00; C09D5/00; C09D5/18; C09J; C09J123/00; C09J123/26; C09J123/28; C08L; C08L2666/00; C08L2666/02; C08L2666/14; C08L2666/28; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
32 words
An intumescent composition, which comprises: a mixture of 4,4'-dinitrosulfanilide as the intumescent agent in a polymeric binder mixture of a chlorinated polyolefin, a bisphenol A epoxy resin and a rubber-like amine hardener.
Claim 2
Dependent Claim
32 words
An intumescent composition, which comprises: a mixture of 4,4'-dinitrosulfanilide as the intumescent agent in a polymeric binder mixture of a chlorinated polyolefin, a bisphenol A epoxy resin and a rubber-like amine hardener.
Claim 3
Dependent Claim
20 words
The composition of claim 1, wherein said 4,4'-dinitrosulfanilide is present in said composition in an amount of 20% to 70%.
Claim 4
Dependent Claim
15 words
The composition of claim 1, wherein said binder mixture is dissolved in an organic solvent.
Claim 5
Dependent Claim
16 words
The composition of claim 3, wherein said organic solvent is benzene, xylene, toluene or methylene chloride.
Claim 6
Dependent Claim
35 words
The composition of claim 1, wherein said chlorinated polyolefin has the structure: CH.sub.3 -- CH.sub.2 -- CCl.sub.2.sub.y -- [CHCkl -- CHCl].sub.x COOH wherein the ratio of y/x provides a chlorine content of 58-62 weight percent.
Claim 7
Dependent Claim
18 words
The composition of claim 1, wherein said bisphenol A epoxy has the formula: ##STR4## wherein n = 1.
Claim 8
Dependent Claim
24 words
The composition in claim 1, wherein said amine hardener has the formula: ##STR5## wherein x = 5, y = 1, and m = 10.
Claim 9
Dependent Claim
20 words
The composition of claim 1, wherein the amount of said chlorinated polyolefin in said composition ranges from 15-60 weight percent.
Claim 10
Dependent Claim
16 words
The composition of claim 1, wherein the amount of said epoxy ranges from 0.5-2.0 weight percent.
Claim 11
Dependent Claim
85 words
An intumescent composition, which comprises: a mixture of from 20-70 weight percent of 4,4' dinitrosulfanilide as an intumescent agent in 80-30 weight percent of a binder system of a chlorinated polyolefin having the formula: CH.sub.3 --CH.sub.2 --CCl.sub.2.sub.y --[CHCl -- CHCl.sub.x COOH wherein the ratio of y/x provides a chlorine content of 58-62 weight percent; a bisphenol A epoxy of the formula: ##STR6## wherein n = 1 and an amine hardener of the formula: ##STR7## wherein x = 5, y = 1, and m = 10.
Claim 12
Dependent Claim
85 words
An intumescent composition, which comprises: a mixture of from 20-70 weight percent of 4,4' dinitrosulfanilide as an intumescent agent in 80-30 weight percent of a binder system of a chlorinated polyolefin having the formula: CH.sub.3 --CH.sub.2 --CCl.sub.2.sub.y --[CHCl -- CHCl.sub.x COOH wherein the ratio of y/x provides a chlorine content of 58-62 weight percent; a bisphenol A epoxy of the formula: ##STR6## wherein n = 1 and an amine hardener of the formula: ##STR7## wherein x = 5, y = 1, and m = 10.
References Cited (Backward Citations)
US3702841A
Cited
US3748154A
Cited
US3855138A
Cited
US3855134A
Cited
DE2458510A1
Cited
US3888819A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-05 | 1981-06-06 | 1981-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-05 | 1985-06-06 | 1985-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-05 | 1989-06-06 | 1989-12-06 | $7700.00 | Window Closed / Lapsed |