Patent US4945015A successfully refreshed from Google Patents.
US4945015A
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Intumescent material
Assignee: Dixon International Ltd
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Filing: 1987-09-17
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Granted: 1990-07-31
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Expires: 2007-09-17
Abstract
Abstract An intumescent material comprises expandible graphite in a polymeric binder. The binder may be a flexible or elastomeric binder or a formaldehyde resin. A suitable flexible binder is a polymer selected from vinyl acetate polymers, styrene polymers, vinyl chloride polymers, acrylic polymers, vinyl butyral polymers, melamine/urea/phenol formaldehyde resins, polyesters and phenolic resins. A suitable elastomeric binder is a rubber. A suitable formaldehyde resin is melamine formaldehyde resin, urea formaldehyde resin, phenol formaldehyde resin or resorcinol formaldehyde resin.
Inventors
- 👤 Bruce A. Milner
- 👤 Tessa Malcolm-Brown
- 👤 Eric Southern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:10
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/18; C09D5/185; C09K; C09K21/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
46 words
A non-foamed intumescent material comprising: 40 to 70% by weight of a copolymer of vinyl acetate and ethylene as a flexible polymeric binder, and 15 to 60% by weight of expandable graphite, the percentages being based on the combined weight of said copolymer and said graphite.
Claim 2
Dependent Claim
46 words
A non-foamed intumescent material comprising: 40 to 70% by weight of a copolymer of vinyl acetate and ethylene as a flexible polymeric binder, and 15 to 60% by weight of expandable graphite, the percentages being based on the combined weight of said copolymer and said graphite.
Claim 3
Dependent Claim
40 words
The material according to claim 1 made by preparing a mixture of the expandable graphite, the polymeric binder and a liquid and causing said mixture to harden at a temperature lower than the temperature at which said graphite would intumesce.
Claim 4
Dependent Claim
27 words
An intumescent material according to claim 1, wherein the graphite is present in an amount of at least 20% by weight and not exceeding 55% by weight.
Claim 5
Dependent Claim
24 words
The intumescent material according to claim 1 wherein the binder and graphite are present in a total amount of at least 70% by weight.
Claim 6
Dependent Claim
25 words
The material according to claim 2 wherein said liquid is water, and the mixture is in the liquid form or as a dough molding compound.
Claim 7
Dependent Claim
25 words
The intumescent material according to claim 1 additionally containing at least one member selected from the group consisting of plasticizers, fillers, catalysts and reinforcing agents.
Claim 8
Dependent Claim
27 words
The material according to claim 6 which contains a plasticizer in the amount of up to 15% of the combined weight of said graphite and said copolymer.
Claim 9
Dependent Claim
12 words
An intumescent seal formed by shaping the material according to claim 1.
Claim 10
Dependent Claim
45 words
The intumescent material according to claim 2 prepared from a mixture of 35 parts of said graphite, 61 parts of an aqueous emulsion or dispersion containing 60% of said vinyl acetate/ethylene copolymer, said aqueous emulsion or dispersion additionally containing 5% by weight of dibutyl phthalate.
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) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |