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Patent US4166743A successfully refreshed from Google Patents.
US4166743A
Expired / Lapsed
US
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Intumescent flame-retardant coating compositions
Assignee: Hoechst AG
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Filing: 1978-01-31
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Granted: 1979-09-04
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Expires: 1998-01-31
Abstract
Abstract Intumescent flame-retardant coating composition consisting substantially of a film-forming agent, an ammonium polyphosphate, one or more substances which are carbonizable under the action of heat, a dispersant, and optionally a filler. The coating composition additionally contains an ammonium polyphosphate activator weighing 0.5 to 50% of the weight of ammonium polyphosphate. The activator is constituted by at least one salt which contains water of crystallization which is liberated upon the composition being heated to about 35 DEG C.
Inventors
- 👤 Joachim Wortmann
- 👤 Franz-Josef Dany
- 👤 Joachim Kandler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:46
CPC Classifications
C; C09; C09K; C09K21/00; C09K21/02; C09K21/04; C09D; C09D5/00; C09D5/18; C09D5/185; Y; Y10; Y10S; Y10S260/00; Y10S260/24; Y10S428/00; Y10S428/92; Y10S428/921
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
74 words
In an intumescent flame-retardant coating composition comprising a film-forming agent, an ammonium polyphosphate, at least one substance carbonizable under the action of heat, and a liquid dispersant; the improvement consisting of an activator for the ammonium polyphosphate consisting essentially of at least one salt which contains water of crystallization that is liberated when the composition is heated to about 35° C. in an amount of 0.5 to 50% by weight of the ammonium polyphosphate.
Claim 2
Dependent Claim
74 words
In an intumescent flame-retardant coating composition comprising a film-forming agent, an ammonium polyphosphate, at least one substance carbonizable under the action of heat, and a liquid dispersant; the improvement consisting of an activator for the ammonium polyphosphate consisting essentially of at least one salt which contains water of crystallization that is liberated when the composition is heated to about 35° C. in an amount of 0.5 to 50% by weight of the ammonium polyphosphate.
Claim 3
Dependent Claim
29 words
A composition as claimed in claim 1, wherein the said activator is at least one salt containing water of crystallization which is soluble, difficultly soluble or insoluble in water.
Claim 4
Dependent Claim
50 words
A composition as claimed in claim 2, wherein the water-soluble salt is selected from Na Al(SO 4 ) 2 .12H 2 O; Na 2 B 4 O 7 .10H 2 O; Al 2 (SO 4 ) 3 .18H 2 O or NH 4 Fe(SO 4 ) 2 .12H 2 O.
Claim 5
Dependent Claim
35 words
A composition as claimed in claim 2, wherein the difficultly water soluble or water insoluble salt is selected from CaSO 4 .2H 2 O; CaHPO 4 .2H 2 O or MgHPO 4 .3H 2 O.
Claim 6
Dependent Claim
30 words
A composition as claimed in claim 1, wherein the salt contains water of crystallization which is liberated upon the composition being heated to a temperature of 35° to 250° C.
Claim 7
Dependent Claim
25 words
A composition as claimed in claim 1, wherein the weight of the said activator is 2 to 20% of the weight of the ammonium polyphosphate.
Claim 8
Dependent Claim
71 words
A composition as claimed in claim 1 of which the composition by weight is substantially as follows: 4 to 25% of film-forming agent; 10 to 40% of ammonium polyphosphate; 8 to 40% of at least one substance carbonizable under the action of heat; up to 5% of dispersant; 0.1 to 20% of at least one salt containing water of crystallization; 0 to 25% of filler; 0 to 25% of expanding agent.
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) | 1982-09-03 | 1983-03-05 | 1983-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-03 | 1987-03-05 | 1987-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-03 | 1991-03-05 | 1991-09-04 | $7700.00 | Window Closed / Lapsed |