US4600634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible fibrous endothermic sheet material for fire protection
Assignee: 3M Co
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Filing: 1985-02-04
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Granted: 1986-07-15
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Expires: 2005-02-04
Abstract
Abstract This invention relates to a non-intumescent, non-char forming, endothermic, essentially inorganic, flexible, fire-protective sheet material. The flexible sheet is made of a composition comprising: (a) an inorganic fiber, such as fiberglass and alumino-silicate refractory fibers; (b) an organic polymer binder, such as an acrylic resin; and (c) an inorganic endothermic filler, such as alumina trihydrate. The weight ratio of organic to inorganic constituents is less than about 0.10, and the weight ratio of inorganic endothermic filler of part (c) to inorganic fiber of part (a) is in the range of about 0.5 to 50. This sheet is a useful fire barrier wrap for conduits and cable trays in building construction, which provides excellent fire protection, and the current capacity derating of cables is significantly less with this new fibrous sheet than it is in the case of known fire barrier sheet materials.
Inventors
- 👤 Roger L. Langer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:12
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/02; B32B15/00; B32B15/14; B32B5/22; B32B5/24; B32B5/26; C; C04; C04B; C04B26/00; C04B26/02; C04B26/04; H; H01; H01B; H01B7/00; H01B7/17; H01B7/29; H01B7/295; H02; H02G; H02G3/00; H02G3/02; H02G3/04; H02G3/0406; H02G3/0412; B32B2264/00; B32B2264/10; B32B2264/102; B32B2305/00; B32B2305/30; C04B2111/00; C04B2111/00474; C04B2111/00612; C04B2111/20; C04B2111/28; C04B2111/50; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/257; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/159; Y10T442/60; Y10T442/654; Y10T442/699
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
94 words
An endothermic, flexible, fibrous sheet material at least 4 millimeters thick made of a composition comprising: (a) a refractory inorganic fiber; (b) an organic polymer binder; and (c) an inorganic, endothermic filler which undergoes an endothermic reaction between about 100° and 600° C., said endothermic flexible fibrous sheet having: a weight ratio of organic to inorganic constituents of less than about 0.10, a density of at least 0.6 g/cc, and a weight ratio of inorganic endothermic filler of part (c) to inorganic fiber of part (a) in the range of about 0.5 to 40.
Claim 2
Dependent Claim
94 words
An endothermic, flexible, fibrous sheet material at least 4 millimeters thick made of a composition comprising: (a) a refractory inorganic fiber; (b) an organic polymer binder; and (c) an inorganic, endothermic filler which undergoes an endothermic reaction between about 100° and 600° C., said endothermic flexible fibrous sheet having: a weight ratio of organic to inorganic constituents of less than about 0.10, a density of at least 0.6 g/cc, and a weight ratio of inorganic endothermic filler of part (c) to inorganic fiber of part (a) in the range of about 0.5 to 40.
Claim 3
Dependent Claim
22 words
The flexible, fibrous sheet material of claim 1 wherein the weight ratio of organic to inorganic constituents is less than about 0.08.
Claim 4
Dependent Claim
27 words
The fibrous sheet material of claim 1 wherein the inorganic endothermic filler of part (c) is selected from the group consisting of alumina trihydrate and magnesium hydroxide.
Claim 5
Dependent Claim
18 words
The fibrous sheet material of claim 3 wherein the inorganic endothermic filler of part (c) is alumina trihydrate.
Claim 6
Dependent Claim
20 words
The fibrous sheet material of claim 3 having a calorific value of no more than about 2,400 joules per gram.
Claim 7
Dependent Claim
19 words
The fibrous sheet material of claim 5 having a calorific value of no more than 2000 joules per gram.
Claim 8
Dependent Claim
22 words
The fibrous sheet material of claim 1 wherein the organic polymer binder comprises about 1 to 6 weight percent of the total.
Claim 9
Dependent Claim
32 words
The fibrous sheet material of claim 1 having a weight ratio of inorganic endothermic filler of part (c) to inorganic fiber of part (a) in the range of about 5.0 to 40.
Claim 10
Dependent Claim
19 words
The fibrous sheet material of claim 1 having a density of about 0.70 to 1.5 grams per cubic centimeter.
Claim 11
Dependent Claim
23 words
The fibrous sheet material of claim 1 wherein the mean particle size of the inorganic endothermic filler is less than about 60 micrometers.
Claim 12
Dependent Claim
26 words
The fibrous sheet material of claim 1 wherein the inorganic fiber of part (a) is selected from the group consisting of silica, alumino-silicate, and glass fibers.
Claim 13
Dependent Claim
14 words
The fibrous sheet material of claim 11 wherein the inorganic fiber comprises alumino-silicate fiber.
Claim 14
Dependent Claim
16 words
The fibrous sheet material of claim 11 wherein the inorganic fiber is comprised of glass fibers.
Claim 15
Dependent Claim
17 words
The fibrous sheet material of claim 1 which further comprises a metal foil backing on one side.
Claim 16
Dependent Claim
17 words
The fibrous sheet material of claim 1 which further comprises a fabric scrim adhered to the sheet.
Claim 17
Dependent Claim
23 words
An enclosure for protecting articles from fire made from the endothermic, fibrous sheet of claim 1 secured around the article to be protected.
Claim 18
Dependent Claim
13 words
A cable tray wrapped with the endothermic, flexible, fibrous sheet of claim 1.
Claim 19
Dependent Claim
12 words
A conduit wrapped with the endothermic, flexible, fibrous sheet of claim 1.
Claim 20
Dependent Claim
21 words
A method of protecting an article from fire comprising enclosing said article within the endothermic, fibrous sheet material of claim 1.
Claim 21
Dependent Claim
18 words
The fibrous sheet material of claim 1 wherein the organic polymer binder is derived from a non-ionic latex.
Claim 22
Dependent Claim
103 words
An endothermic, flexible, fibrous sheet material at least 4 millimeters thick made of a composition comprising: (a) a refractory inorganic fiber having a fiber diameter of less than one micrometer; (b) an organic polymer binder; and (c) an inorganic, endothermic filler which undergoes an endothermic reaction between about 100° and 600° C., said endothermic flexible fibrous sheet having a weight ratio of organic to inorganic constituents of less than about 0.10, a density of at least 0.6 g/cc, and a weight ratio of inorganic endothermic filler of part (c) to inorganic fiber of part (a) in the range of about 0.5 to 40.
Claim 23
Dependent Claim
103 words
An endothermic, flexible, fibrous sheet material at least 4 millimeters thick made of a composition comprising: (a) a refractory inorganic fiber having a fiber diameter of less than one micrometer; (b) an organic polymer binder; and (c) an inorganic, endothermic filler which undergoes an endothermic reaction between about 100° and 600° C., said endothermic flexible fibrous sheet having a weight ratio of organic to inorganic constituents of less than about 0.10, a density of at least 0.6 g/cc, and a weight ratio of inorganic endothermic filler of part (c) to inorganic fiber of part (a) in the range of about 0.5 to 40.
Claim 24
Dependent Claim
15 words
The flexible fibrous sheet material of claim 21 wherein the refractory inorganic fiber is fiberglass.
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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) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |