US4286013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame barrier
Assignee: 3M Co
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Filing: 1980-08-29
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Granted: 1981-08-25
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Expires: 2000-08-29
Abstract
Abstract This invention relates to devices for preventing the spread of flame (i.e., flame barriers). The invention comprises a sheet having a backing bearing a coating of 50 to 70 weight % diorganopolysiloxane gum, 1 to 10 weight % fibrous filler, 20 to 45 weight % hollow glass microspheres, and 1 to 5 parts by weight curing agent per 100 parts by weight of said gum. The sheet (i) is substantially free from components volatilizing below 350°C., and (ii) has a weight of at most 0.6 g/cm 2 . Preferably the coating is applied in a multilayer fashion. The present invention is a light-weight, non-intumescing sheet useful as a flame barrier between fuel tanks or engines and passenger or cargo compartments of mass transportation vehicles.
Inventors
- 👤 Minoo J. Daroga
- 👤 Robert E. Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:26
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/32; B; B29; B29C; B29C70/00; B29C70/02; B29C70/021; B29C70/025; B29C70/58; B29C70/66; E; E04; E04B; E04B1/00; E04B1/62; E04B1/92; E04B1/94; B29K; B29K2083/00; B29K2105/00; B29K2105/06; B29K2105/16; B29K2105/165; B29K2307/00; B29K2309/00; B29K2309/02; B29K2309/08; B29K2709/00; B29K2709/08; C08J2383/00; C08J2383/04; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/26; Y10T428/261; Y10T428/269; Y10T428/27; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2996; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T442/00; Y10T442/20; Y10T442/2631; Y10T442/2926; Y10T442/2975; Y10T442/2984; Y10T442/2992
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
94 words
A sheet useful as a flame barrier comprising a backing having thereon a coating comprising from 50 to 70% by weight of a cured diorganopolysiloxane gum, from 1 to 10% by weight of a fibrous filler, from 20 to 45% by weight of hollow glass microspheres, and from 1 to 5 parts by weight of a curing agent per 100 parts by weight of said diorganopolysiloxane gum, wherein said sheet is substantially free from components which volatilize below 350° C., and wherein said sheet has a weight of, at most, 0.06 g/cm 2 .
Claim 2
Dependent Claim
94 words
A sheet useful as a flame barrier comprising a backing having thereon a coating comprising from 50 to 70% by weight of a cured diorganopolysiloxane gum, from 1 to 10% by weight of a fibrous filler, from 20 to 45% by weight of hollow glass microspheres, and from 1 to 5 parts by weight of a curing agent per 100 parts by weight of said diorganopolysiloxane gum, wherein said sheet is substantially free from components which volatilize below 350° C., and wherein said sheet has a weight of, at most, 0.06 g/cm 2 .
Claim 3
Dependent Claim
13 words
A sheet according to claim 1 wherein said substrate comprises a fiberglass fabric.
Claim 4
Dependent Claim
13 words
A sheet according to claim 2 wherein said fibrous filler comprises ceramic fiber.
Claim 5
Dependent Claim
17 words
A sheet according to claim 2 wherein said fibrous filler is selected from carbon and graphite fiber.
Claim 6
Dependent Claim
24 words
A sheet according to claim 3 or 4 wherein at least one of the organo groups of said diorganopolysiloxane gum is a vinyl group.
Claim 7
Dependent Claim
7 words
A flexible sheet according to claim 1.
Claim 8
Dependent Claim
14 words
A sheet according to claim 1 wherein said coating further comprises a fire retardant.
Claim 9
Dependent Claim
20 words
A sheet according to claim 1 which has a weight in the range of 0.04 to 0.06 g/cm 2 .
Claim 10
Dependent Claim
18 words
A sheet according to claim 1 which has a thickness in the range of 1000 to 1450 microns.
Claim 11
Dependent Claim
107 words
A sheet according to claim 1 comprising (i) a flexible fiberglass fabric backing having a thickness of about 180 microns and a weight of about 0.02 g/cm 2 , and (ii) a coating on at least one side of said fabric backing having a thickness of about 1065 microns thick and a weight of about 0.03 g/cm 2 ; wherein said coating comprises about 65 weight % diorganopolysiloxane gum, about 3 weight % fiber filler, about 32 weight % hollow glass microspheres, and about 3 parts curing agent per 100 parts diorganopolysiloxane gum; and wherein said sheet is substantially free from components which volatilize below 350° C.
Claim 12
Dependent Claim
17 words
A sheet according to claim 3 or 4 wherein said diorganopolysiloxane gum is free from vinyl groups.
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) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |