Patent US4438220A successfully refreshed from Google Patents.
US4438220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane foam-filled foam resistant to combustion and method of producing same
Assignee: WM T Burnett and Co Inc
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Filing: 1982-08-18
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Granted: 1984-03-20
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Expires: 2002-08-18
Abstract
Abstract Polyurethane foam products comprising a foam filled with a foam and a large amount of combustion retardant materials are described. The foams are prepared by foaming a polyurethane foam-forming diisocyanate and polyol around pre-formed polyurethane foam chips having incorporated therein solid combustion retardant materials. The polyurethane foam-filled foams have excellent physical characteristics and, because of their combustion properties, are particularly suitable for furniture upholstery and cushioning applications including in mattresses.
Inventors
- 👤 Roland N. Fracalossi
- 👤 Walter V. V. Greenhouse
- 👤 Michael S. Buchanan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:26
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/35; C08J9/0014; C08J9/0028; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
120 words
A combustion-retardant polyurethane foam structure obtained through the steps of (a) obtaining particles of flexible polyurethane foam; (b) admixing said particles of (a) with solid combustion-retardant material; (c) uniformly applying to said admixture of (b) a liquid flexible polyurethane foam-forming material containing a reactive polyol and a polyisocyanate; (d) foaming said foam-forming material (c) with water to provide a flexible foam having bonded therein said polyurethane foam particles and said solid combustion-retardant material; the relative amounts of materials in said foam structure being such that for each 100 parts by weight of polyurethane foam particles, about 100 to 200 parts by weight of said combustion-retardant material and about 30 to 75 parts by weight of said foam-forming material are used.
Claim 2
Dependent Claim
120 words
A combustion-retardant polyurethane foam structure obtained through the steps of (a) obtaining particles of flexible polyurethane foam; (b) admixing said particles of (a) with solid combustion-retardant material; (c) uniformly applying to said admixture of (b) a liquid flexible polyurethane foam-forming material containing a reactive polyol and a polyisocyanate; (d) foaming said foam-forming material (c) with water to provide a flexible foam having bonded therein said polyurethane foam particles and said solid combustion-retardant material; the relative amounts of materials in said foam structure being such that for each 100 parts by weight of polyurethane foam particles, about 100 to 200 parts by weight of said combustion-retardant material and about 30 to 75 parts by weight of said foam-forming material are used.
Claim 3
Dependent Claim
27 words
The structure of claim 1 wherein said particles of polyurethane foam are obtained as the reaction product of a polyether polyol and a polyisocyanate, foamed with water.
Claim 4
Dependent Claim
17 words
The structure of claim 2 wherein said liquid flexible polyurethane foam-forming material contains a reactive polyether polyol.
Claim 5
Dependent Claim
26 words
The structure of claim 1 wherein said particles of polyurethane foam are obtained as the reaction product of polyester polyol and a polyisocyanate, foamed with water.
Claim 6
Dependent Claim
17 words
The structure of claim 4 wherein said liquid flexible polyurethane foam-forming material contains a reactive polyester polyol.
Claim 7
Dependent Claim
20 words
The structure of claim 1 including uniformly contained therein a liquid combustion-retardant material in combination with said solid combustion-retardant material.
Claim 8
Dependent Claim
26 words
The structure of claim 6 wherein said combination of combustion-retardant materials comprises alumina hydrate, decabromodiphenyl oxide, anitmony trioxide, ethylene-maleic anhydride copolymer, and tetrakis (2-chloroethyl), ethylene diphosphate.
Claim 9
Independent Claim
121 words
The method of forming a combustion-retardant polyurethane foam structure comprising the steps of (a) obtaining particles of flexible polyurethane foam; (b) admixing said particles of (a) with solid combustion-retardant material; (c) uniformly applying to said admixture of (b) a liquid flexible polyurethane foam-forming material containing a reactive polyol and polyisocyanate; (d) foaming said foam-forming material with water to provide a flexible foam having bonded therein said polyurethane foam particles and said solid combustion-retardant material; the relative amounts of materials in said foam structure being such that for each 100 parts by weight of polyurethane foam particles, about 100 to 200 parts by weight of said combustion-retardant material and about 30 to 75 parts by weight of said foam-forming material are used.
Claim 10
Independent Claim
121 words
The method of forming a combustion-retardant polyurethane foam structure comprising the steps of (a) obtaining particles of flexible polyurethane foam; (b) admixing said particles of (a) with solid combustion-retardant material; (c) uniformly applying to said admixture of (b) a liquid flexible polyurethane foam-forming material containing a reactive polyol and polyisocyanate; (d) foaming said foam-forming material with water to provide a flexible foam having bonded therein said polyurethane foam particles and said solid combustion-retardant material; the relative amounts of materials in said foam structure being such that for each 100 parts by weight of polyurethane foam particles, about 100 to 200 parts by weight of said combustion-retardant material and about 30 to 75 parts by weight of said foam-forming material are used.
Claim 11
Dependent Claim
47 words
The method of claim 8 wherein said structure is formed by placing the reactive mixture obtained from steps (a), (b), and (c) in a mold and compressing to the desired density and thereafter exposing said mixture to live steam at low pressure to foam said foam-forming material.
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) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |