EP0030123A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Intumescent sheet material
Assignee: 3M Co
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Filing: 1980-11-26
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Granted: —
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Expires: 2000-11-26
Abstract
Abstract Flexible intumescent sheet materials particularly useful for mounting automotive catalytic converter monoliths, said sheets having greatly decreased negative expansion characteristics in the range of 200 to 400°C, and which are thermally resistant and resilient after expansion, are disclosed. The flexible intumescent sheets may be formed by standard paper-making techniques from a furnish comprising from 40% to 65% by weight of NH + 4 -exchanged unexpanded vermiculite, from 25% to 50% by weight of inorganic fibrous material and from 5 to 15% of binder.
Inventors
- 👤 Roger L. Langer
- 👤 Alan J. Marlor
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 09:30
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2839; F01N3/2853; F01N3/2857; D; D21; D21H; D21H13/00; D21H13/36; D21H13/38; D21H13/44; D21H21/00; D21H21/14; D21H21/34; D21H5/00; D21H5/12; D21H5/18; F01N2350/00; F01N2350/02; Y; Y10; Y10S; Y10S106/00; Y10S106/03; Y10S428/00; Y10S428/913; Y10S428/92; Y10T; Y10T428/00; Y10T428/25; Y10T428/251; Y10T428/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
68 words
A flexible intumescent sheet useful for mounting autmotive catalytic converter monoliths comprising from 40% to 65% by weight of treated (as herein defined) unexpanded vermiculite, from 25% to 50% by weight of inorganic fibrous material and from 5% to 15% of binder, said sheet having a maximum percent negative expansion of about 10% at about 300°C and returning to its original starting thickness or greater at about 350°C.
Claim 2
Dependent Claim
68 words
A flexible intumescent sheet useful for mounting autmotive catalytic converter monoliths comprising from 40% to 65% by weight of treated (as herein defined) unexpanded vermiculite, from 25% to 50% by weight of inorganic fibrous material and from 5% to 15% of binder, said sheet having a maximum percent negative expansion of about 10% at about 300°C and returning to its original starting thickness or greater at about 350°C.
Claim 3
Dependent Claim
22 words
A flexible intumescent sheet according to claim 1 wherein the treated vermiculite is vermiculite which has been impregnated with ammonium dihydrogen phosphate.
Claim 4
Dependent Claim
21 words
A flexible intumescent sheet according to claim 1 wherein the treated vermiculite is vermiculite which has been impregnated with ammonium carbonate.
Claim 5
Dependent Claim
21 words
A flexible intumescent sheet according to claim 1 wherein the treated vermiculite is vermiculite which has been impregnated with ammonium acetate.
Claim 6
Dependent Claim
21 words
A flexible intumescent sheet according to claim 1 wherein the treated vermiculite is vermiculite which has been impregnated with ammonium hydroxide.
Claim 7
Dependent Claim
22 words
A flexible intumescent sheet according to claim 1 wherein the inorganic fibrous material is asbestos, soft glass fiber or refractory alumino-silicate fiber.
Claim 8
Dependent Claim
16 words
A flexible intumescent sheet according to claim 1 wherein the binder is an organic elastomeric material.
References Cited (Backward Citations)
US2747734A
Cited
FR1277899A
Cited
US3325340A
Cited
US3654073A
Cited
US3830892A
Cited
GB1513808A
Cited
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