US4324835A
Expired / Lapsed
US
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Cellular intumescent materials
Assignee: DUNLOPILLO Ltd
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Filing: 1980-04-24
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Granted: 1982-04-13
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Expires: 2000-04-24
Abstract
Abstract A cellular intumescent material comprising a substantially open-called substrate impregnated with a flexible intumescent polymer. The open-celled nature of the substrate is retained. The substrate may be a latex or urethane-based foam, a natural rubber or a synthetic rubber. The impregnant comprises at least a binder (A) and an intumescent component (B). The binder (A) can be a polyester, a liquid polymer system, a resin, a latex or an elastomer solution. The intumescent component (B) consists of a carbonific element (e.g. starch, sugar, sorbitol or pentaerythritol, or a compound which can polymerize to a "ladder" structure) and a spumific element (e.g. an inorganic acid or a precursor therefor). On exposure to a flame the materials flame initially but form a protective char and subsequently extinguish. The char prevents further burning of the treated material.
Inventors
- 👤 Christopher V. Keen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:12
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; C08J9/40; C08J9/42; C08J2421/00; C08J2427/00; C08J2429/00; C08J2433/00; C08J2461/00; C08J2467/00; C08J2477/00; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249954; Y10T428/249955; Y10T428/249958
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
95 words
A cellular, intumescent material obtained by treating an open-celled substrate selected from the class consisting of polyether-based urethane foams, latex foams, natural rubbers and synthetic rubbers with a flexible, intumescable polymeric material, said flexible, intumescable polymeric material being one which, on exposure to a flame, melts, foams and solidifies to a foamed carbonaceous char, whereby said open-celled substrate becomes surrounded with an intumescent foam layer, said intumescable polymeric material comprising (A) a binder and (B) an intumescent component, said intumescent component (B) comprising a carbonific element different from said binder (A) and a spumific element.
Claim 2
Dependent Claim
95 words
A cellular, intumescent material obtained by treating an open-celled substrate selected from the class consisting of polyether-based urethane foams, latex foams, natural rubbers and synthetic rubbers with a flexible, intumescable polymeric material, said flexible, intumescable polymeric material being one which, on exposure to a flame, melts, foams and solidifies to a foamed carbonaceous char, whereby said open-celled substrate becomes surrounded with an intumescent foam layer, said intumescable polymeric material comprising (A) a binder and (B) an intumescent component, said intumescent component (B) comprising a carbonific element different from said binder (A) and a spumific element.
Claim 3
Dependent Claim
22 words
The material of claim 1, wherein said substrate is a synthetic rubber selected from the class consisting of polybutadiene and styrene/butadiene rubbers.
Claim 4
Dependent Claim
30 words
The material of claim 1, wherein said binder (A) is a substance selected from the class consisting of polyesters, liquid polymer systems, resins, latices and solutions of thermoplastic elastomeric materials.
Claim 5
Dependent Claim
24 words
The material of claim 3, wherein said binder (A) is a substance selected from the class consisting of butadiene, styrene/butadiene copolymers and acrylonitrile/butadiene copolymers.
Claim 6
Dependent Claim
32 words
The material of claim 3, wherein said binder (A) is a substance selected from the class consisting of phenolic resins, urea/formaldehyde resins, resins based on polyvinyl chloride, alkyd resins and polyamide resins.
Claim 7
Dependent Claim
33 words
The material of claim 3, wherein said binder (A) is a substance selected from the class consisting of latices of neoprene, of styrene/butadiene rubber, of polyvinyl acetate, of polyvinyl chloride and of polyacrylonitrile.
Claim 8
Dependent Claim
17 words
The material of claim 1, wherein said carbonific element is a polyhydric material of high carbon content.
Claim 9
Dependent Claim
20 words
The material of claim 1, wherein said carbonific element is an aromatic compound capable of polymerisation to a "ladder" structure.
Claim 10
Dependent Claim
22 words
The material of claim 7, wherein said carbonific element is a substance selected from the class consisting of sorbitol, pentaerythritol and starch.
Claim 11
Dependent Claim
21 words
The material of claim 8, wherein said carbonific element is a substance selected from the class consisting or ortho- and para-nitroaniline.
Claim 12
Dependent Claim
29 words
The material of claim 1, wherein said spumific element is a substance selected from the class consisting of inorganic acids and substances capable of decomposition to yield inorganic acids.
Claim 13
Dependent Claim
37 words
The material of claim 11, wherein said spumific element is a substance selected from the class consisting of boric acid, phosphoric acid, sulphuric acid, ammonium halides, ammonium phosphates ammonium polyphosphates, melamine phosphate, urea phosphate and para-nitroaniline bisulphate.
Claim 14
Dependent Claim
116 words
A cellular, intumescent material consisting essentially of (a) an open-celled substrate selected from the class consisting of polyether-based urethane foams, latex foams, natural rubbers and synthetic rubbers, and (b) a flexible intumescable polymeric material, said flexible intumescable polymeric material being one which, on exposure to flame, melts, foams and solidifies to a foamed carbonaceous char, whereby said open-celled substrate becomes surrounded with an intumescent foam layer, said intumescable polymeric material comprising; (A) a binder, and (B) an intumescent component, said intumescent component (B) comprising: (i) a carbonific element different from said binder (A) and (ii) a spumific element; wherein said cellular intumescent material is obtained by treating said open-celled substrate with said flexible, intumescable polymeric material.
Claim 15
Dependent Claim
116 words
A cellular, intumescent material consisting essentially of (a) an open-celled substrate selected from the class consisting of polyether-based urethane foams, latex foams, natural rubbers and synthetic rubbers, and (b) a flexible intumescable polymeric material, said flexible intumescable polymeric material being one which, on exposure to flame, melts, foams and solidifies to a foamed carbonaceous char, whereby said open-celled substrate becomes surrounded with an intumescent foam layer, said intumescable polymeric material comprising; (A) a binder, and (B) an intumescent component, said intumescent component (B) comprising: (i) a carbonific element different from said binder (A) and (ii) a spumific element; wherein said cellular intumescent material is obtained by treating said open-celled substrate with said flexible, intumescable polymeric material.
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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) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |