US4722945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame-retardant latex foams
Assignee: DUNLOPILLO Ltd
•
Filing: 1987-05-04
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Granted: 1988-02-02
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Expires: 2007-05-04
Abstract
Abstract A flame-retardant latex foam contains at least 35 (and preferably 40 to 55) parts by weight of an expandable graphite per hundred parts by weight of latex. Additional flame-retardant materials (e.g. hydrated aluminas, magnesium hydroxide, compounds of halogen and/or phosphorus, boron compounds, antimony oxides or melamine) can be included in the foam formulation, as can fillers or intumescent agents. The expandable graphite contains one or more exfoliating agents such that considerable expansion will occur at high temperatures. Foams according to the present invention satisfy the conditions of British Standard Specification Nos. 5852; Part 2; 1982 and 4735; 1974.
Inventors
- 👤 Kenneth Wood
- 👤 Raymond W. H. Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:45
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; Y; Y10; Y10S; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
55 words
A flame-retardant latex foam made from a foam formulation including a latex selected from the group consisting of natural rubber latex, synthetic rubber latices and mixtures thereof, together with an effective amount of an expandable graphite containing exfoliating agents, said effective amount being at least 35 parts by weight per 100 parts by weight latex.
Claim 2
Dependent Claim
55 words
A flame-retardant latex foam made from a foam formulation including a latex selected from the group consisting of natural rubber latex, synthetic rubber latices and mixtures thereof, together with an effective amount of an expandable graphite containing exfoliating agents, said effective amount being at least 35 parts by weight per 100 parts by weight latex.
Claim 3
Dependent Claim
28 words
The foam of claim 1, wherein said effective amount of expandable graphite is from 40 to 55 parts by weight per 100 parts by weight of said latex.
Claim 4
Dependent Claim
37 words
The foam of claim 1, wherein said foam formulation also includes at lease one flame-retardant substance selected from the group consisting of hydrated aluminas, magnesium hydroxide, compounds containing halogen and/or phosphorous, antimony oxides, boron compounds and melamine.
Claim 5
Dependent Claim
26 words
The foam of claim 1, wherein said foam formulation also includes a filter selected from the group consisting of magnesium carbonate, calcium carbonate and aluminium silicate.
Claim 6
Dependent Claim
14 words
The foam of claim 1, wherein said foam formulation also includes an intumescent agent.
Claim 7
Dependent Claim
13 words
The foam of claim 5, wherein said intumescent agent is an ammonium polyphosphate.
References Cited (Backward Citations)
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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) | 1991-02-01 | 1991-08-03 | 1992-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-01 | 1995-08-03 | 1996-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-01 | 1999-08-03 | 2000-02-02 | $7700.00 | Window Closed / Lapsed |