US4808476A
Expired / Lapsed
US
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Method for protecting heat sensitive substrates from fire and excessive heat and resulting article
Assignee: PPG Industries Ohio Inc
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Filing: 1987-06-19
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Granted: 1989-02-28
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Expires: 2007-06-19
Abstract
Abstract A method for protecting heat sensitive substrates from fire and excessive heat involves: I. applying to the substrate a layer of a char forming intumescent curable composition comprising: (a) an epoxide group containing material, at least 20 weight percent of said material having an oxirane functionality greater than 2; (b) a curing agent adapted to cure the epoxide group containing material wherein at least 20 weight percent of said curing agent is comprised of an aralkyl polyamine containing material; (c) an additive component comprising a mixture of materials adapted to provide a source of: (i) phosphorous, (ii) zinc, (iii) boron and (iv) an expansion gas upon thermal decomposition, said curable composition being capable of forming a carbonaceous char upon exposure to heat or flame; II. allowing the intumescent curable composition to at least partially cure.
Inventors
- 👤 John P. Mikus
- 👤 Robert W. Heber
- 👤 Thomas A. Ward
- 👤 Jerome A. Seiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:00
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/18; C09D5/185; C09K; C09K21/00; C09K21/14; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31678
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
135 words
A method for protecting heat sensitive substrates from fire and excessive heat comprising: I. applying to the substrate a layer of a char forming intumescent curable composition comprising: (a) an epoxide group containing material, at least 20 weight percent of said material having an oxirane funtionality greater than 2; (b) a curing agent adapted to cure the epoxide group containing material wherein at least 20 weight percent of said curing agent is comprised of an aralkyl polyamine containing material; (c) an additive component comprising a mixture of materials adapted to proved a source of: (i) phosphorous, (ii) zinc, (iii) boron and (iv) an expansion gas upon thermal decomposition, said curable composition being capable of forming a carbonaceous char upon exposure to heat or flame; II. allowing the intumescent curable composition to at least partially cure.
Claim 2
Independent Claim
135 words
A method for protecting heat sensitive substrates from fire and excessive heat comprising: I. applying to the substrate a layer of a char forming intumescent curable composition comprising: (a) an epoxide group containing material, at least 20 weight percent of said material having an oxirane funtionality greater than 2; (b) a curing agent adapted to cure the epoxide group containing material wherein at least 20 weight percent of said curing agent is comprised of an aralkyl polyamine containing material; (c) an additive component comprising a mixture of materials adapted to proved a source of: (i) phosphorous, (ii) zinc, (iii) boron and (iv) an expansion gas upon thermal decomposition, said curable composition being capable of forming a carbonaceous char upon exposure to heat or flame; II. allowing the intumescent curable composition to at least partially cure.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein the aralkyl polyamine is an aralkyl diamine.
Claim 4
Dependent Claim
12 words
The method of claim 2 wherein the curing agent comprises 1,4-xylylene diamine.
Claim 5
Dependent Claim
12 words
The method of claim 1 wherein the curing agent is a liquid.
Claim 6
Dependent Claim
22 words
the method of claim 1 wherein the composition is a one package system wherein the curing agent is a latent curing agent.
Claim 7
Dependent Claim
15 words
The method of claim 1 wherein the intumescent curable composition additionally comprises a reinforcing filler.
Claim 8
Dependent Claim
15 words
The method of claim 6 wherein the reinforcing filler is in fibrous or platelet form.
Claim 9
Dependent Claim
11 words
The method of claim 7 wherein the reinforcing filler is Wollastonite.
Claim 10
Dependent Claim
46 words
The method of claim 1 wherein the composition is a two package system with the epoxy resin in one package, the curing agent in a second package and the additive component in either the epoxy resin package or the curing agent package, or in both packages.
Claim 11
Dependent Claim
22 words
The method of claim 1 wherein the curable composition is applied such that the substrate is essentially encapsulated in the applied coating.
Claim 12
Dependent Claim
14 words
The method of claim 1 wherein the heat sensitive substrate is a polymeric material.
Claim 13
Dependent Claim
11 words
The method of claim 11 wherein the substrate is a plastic.
Claim 14
Dependent Claim
18 words
The method of claim 12 wherein the substrate is a plastic coated electrical cable or group of cables.
Claim 15
Dependent Claim
7 words
A coated article according to claim 12.
Claim 16
Dependent Claim
19 words
The method of claim 1 wherein the heat sensitive substrate is a metal having a relatively low melting point.
Claim 17
Dependent Claim
14 words
The method of claim 15 wherein the substrate is aluminum or an aluminum alloy.
Claim 18
Dependent Claim
7 words
A coated article according to claim 16.
Claim 19
Dependent Claim
7 words
A coated article according to claim 1.
Claim 20
Dependent Claim
17 words
The method of claim 1 wherein the epoxide group containing material is the triglycidyl ether of trimethylolpropane.
Claim 21
Dependent Claim
40 words
The method of claim 1 wherein the material adapted to provide a source of phosphorous is an ammonium polyphosphate represented by the formula (NH 4 ) n+2 P n O 3n+1 wherein n is an integer of at least 2.
Claim 22
Dependent Claim
14 words
The method of claim 20 wherein n is an integer of at least 50.
Claim 23
Dependent Claim
19 words
The method of claim 20 wherein the material adapted to provide a source of phosphorous is a phosphorous-containing amide.
Claim 24
Dependent Claim
20 words
The method of claim 1 wherein the material adapted to provide a source of expansion gas is a nitrogen-containing material.
Claim 25
Dependent Claim
12 words
The method of claim 23 wherein the expansion gas-providing material is melamine.
Claim 26
Dependent Claim
29 words
The method of claim 1 wherein the material adapted to provide a source of zinc is selected from the group consisting of zinc oxide, zinc borate, and zinc phosphate.
Claim 27
Dependent Claim
29 words
The method of claim 1 wherein the material adapted to provide a source of boron is selected from the group consisting of boric acid, ammonium borate and sodium borate.
References Cited (Backward Citations)
GB1280543A
Cited
US3755223A
Cited
GB1575708A
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GB2071111A
Cited
GB2121056A
Cited
US4529467A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-28 | 1992-08-29 | 1993-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-28 | 1996-08-29 | 1997-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-28 | 2000-08-29 | 2001-02-28 | $7700.00 | Window Closed / Lapsed |