US4599369A
Expired / Lapsed
US
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Intumescent composition
Assignee: Dixon International Ltd
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Filing: 1984-10-09
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Granted: 1986-07-08
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Expires: 2004-10-09
Abstract
Abstract An intumescent rubber or elastomeric composition comprises a rubber or elastomer containing: (a) one or more organic polyhydroxy compounds as carbonific; (b) one or more organic polyamido compounds in free and/or combined forms as spumific; (c) an ammonium phosphate as activator for the carbonific; and (d) an amino resin as binder; and in addition to or instead of components (a) to (d), (e) sodium silicate as an intumescent material, components (a) to (d) when present being intermixed with one another.
Inventors
- 👤 Tessa Malcolm-Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:35
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/29; C08K5/31; C08K13/00; C08K13/02; C08K3/00; C08K3/32; C08K3/34; C08K5/0008; C08K5/0066; C08L; C08L21/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
127 words
An intumescent rubber composition comprising a rubber containing: (a) one or more organic polyhydroxy compounds as a carbonific in an amount of 0.41 to 1.23 by weight of the total composition; (b) dicyandiamide for guanidine as a spumific in an amount of 1.04 to 3.10% by weight of the total composition; (c) an ammonium phosphate as an activator for the carbonific in an amount of 2.18 to 6.54% by weight of the total composition; and (d) a melamine formaldehyde resin as a binder in an amount of 1.97 to 5.9% by weight of the total composition; said components (a), (b), (c) and (d) being intermixed with each other and then added to the rubber in an amount of 2 to 50% by weight of the total composition.
Claim 2
Dependent Claim
127 words
An intumescent rubber composition comprising a rubber containing: (a) one or more organic polyhydroxy compounds as a carbonific in an amount of 0.41 to 1.23 by weight of the total composition; (b) dicyandiamide for guanidine as a spumific in an amount of 1.04 to 3.10% by weight of the total composition; (c) an ammonium phosphate as an activator for the carbonific in an amount of 2.18 to 6.54% by weight of the total composition; and (d) a melamine formaldehyde resin as a binder in an amount of 1.97 to 5.9% by weight of the total composition; said components (a), (b), (c) and (d) being intermixed with each other and then added to the rubber in an amount of 2 to 50% by weight of the total composition.
Claim 3
Dependent Claim
14 words
An intumescent composition according to claim 1, wherein the activator is monoammonium dihydrogen phosphate.
Claim 4
Dependent Claim
15 words
An intumescent composition according to claim 1, further comprising polyvinyl acetate as an additional binder.
Claim 5
Dependent Claim
23 words
An intumescent composition according to claim 1, wherein the rubber has distributed therethrough particles of the intermixed components (a), (b), (c), and (d).
Claim 6
Dependent Claim
20 words
An intumescent composition according to claim 4, wherein the particle size of the intermixed components is less than 125 microns.
Claim 7
Dependent Claim
20 words
An intumescent composition according to claim 4, wherein the particle size of the intermixed components is less than 75 microns.
Claim 8
Dependent Claim
17 words
An intumescent composition according to claim 1, wherein components (a) to (d) are distributed through the rubber.
Claim 9
Dependent Claim
22 words
An intumescent composition according to claim 7, wherein components (a) to (d) are present in at least one region within the rubber.
Claim 10
Dependent Claim
36 words
An intumescent composition according to claim 1, further comprising, in addition to components (a) to (d), sodium silicate in an amount of 4.6 to 11.5% by weight based on the total of ingredients (a) to (d).
Claim 11
Dependent Claim
25 words
An intumescent composition according to claim 1, wherein the amount of sodium silicate intermixed therewith does not exceed 30% by weight based on component (c).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |