Patent US5169876A successfully refreshed from Google Patents.
US5169876A
Expired / Lapsed
US
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Process for producing a flame-resistant elastic soft polyurethane foam
Assignee: Metzeler Schaum GmbH
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Filing: 1990-11-19
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Granted: 1992-12-08
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Expires: 2010-11-19
Abstract
Abstract A process for producing a flame-resistant elastic soft polyurethane foam from a foam reaction component mixture of a polyol, a polyisocyanate, and a proportion of expanded graphite in the form of flakes as a flame retardant, includes initially admixing the flakes having a size on the order of magnitude of resultant foam cell walls with the polyol component. The flakes are incorporated to form at least part of the cell walls upon expansion of the foam.
Inventors
- 👤 Ulrich Heitmann
- 👤 Heribert Rossel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:13
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08K7/00; C08K7/22; C08K7/24; C08L; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
80 words
In a process for producing a flame-resistant elastic soft polyurethane foam from a foam reaction component mixture of a polyol, a polyisocyanate, and a proportion of expanded graphite in the form of flakes as a flame retardant, the improvement which comprises initially admixing the flakes having a size on the order of magnitude of resultant foam cell walls with the polyol component, and incorporating the flakes to form at least part of the cell walls upon expansion of the foam.
Claim 2
Dependent Claim
80 words
In a process for producing a flame-resistant elastic soft polyurethane foam from a foam reaction component mixture of a polyol, a polyisocyanate, and a proportion of expanded graphite in the form of flakes as a flame retardant, the improvement which comprises initially admixing the flakes having a size on the order of magnitude of resultant foam cell walls with the polyol component, and incorporating the flakes to form at least part of the cell walls upon expansion of the foam.
Claim 3
Dependent Claim
40 words
Process according to claim 1, which comprises initially admixing the expanded graphite flakes with only some of the polyol component while leaving a remaining polyol component containing other additives in the form of activators, accelerators, cross-linkers and other flame retardants.
Claim 4
Dependent Claim
17 words
Process according to claim 1, which comprises elevating the temperature of the polyol component prior to admixing.
Claim 5
Dependent Claim
19 words
Process according to claim 1, which comprises additionally admixing smoke reducers with the polyol component containing the expanded graphite.
Claim 6
Dependent Claim
24 words
Process according to claim 1, which comprises performing the admixing step with graphite flakes have a size of substantially from 0.3 to 1.0 mm.
Claim 7
Dependent Claim
17 words
Process according to claim 1, which comprises additionally dispersing caseine in powdered form in the polyol component.
Claim 8
Dependent Claim
19 words
Process according to claim 1, which comprises additionally dispersing hardened, denatured caseine in powdered form in the polyol component.
Claim 9
Dependent Claim
31 words
Process according to claim 6, which comprises adjusting the proportion of the caseine to substantially from to 5 to 30 parts by weight, relative to the weight of the polyol component.
Claim 10
Dependent Claim
31 words
Process according to claim 7, which comprises adjusting the proportion of the caseine to substantially from to 5 to 30 parts by weight, relative to the weight of the polyol component.
Claim 11
Dependent Claim
28 words
Process according to claim 6, which comprises adjusting the amount of the caseine to be substantially at most equal to three times the amount of the expanded graphite.
Claim 12
Dependent Claim
28 words
Process according to claim 7, which comprises adjusting the amount of the caseine to be substantially at most equal to three times the amount of the expanded graphite.
Claim 13
Dependent Claim
28 words
Process according to claim 8, which comprises adjusting the amount of the caseine to be substantially at most equal to three times the amount of the expanded graphite.
Claim 14
Dependent Claim
28 words
Process according to claim 9, which comprises adjusting the amount of the caseine to be substantially at most equal to three times the amount of the expanded graphite.
Claim 15
Dependent Claim
31 words
Process according to claim 1, which comprises adjusting the proportion of the expanded graphite to substantially from 5 to 40 parts by weight relative to the weight of the polyol component.
Claim 16
Dependent Claim
25 words
Process according to claim 1, which comprises adjusting the specific density of the filled foam to be substantially from 20 to 80 kg/m 3 .
Claim 17
Dependent Claim
17 words
Process according to claim 1, which comprises adding halogenated phosphoric acid ester as an additional flame retardant.
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) | 1995-12-08 | 1996-06-08 | 1996-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-08 | 2000-06-08 | 2000-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-08 | 2004-06-08 | 2004-12-08 | $7700.00 | Window Closed / Lapsed |