Patent US2052783A successfully refreshed from Google Patents.
Patent US4308093A successfully refreshed from Google Patents.
US4308093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature resistant compressible sheet material for gasketing and the like
Assignee: DVSG Holding GmbH
•
Filing: 1979-12-03
•
Granted: 1981-12-29
•
Expires: 1999-12-03
Abstract
Abstract A high temperature resistant compressible sheet material has a thickness of 0.001 to 1 inch and includes a crosslinked elastomer as a binder and high temperature staple fibers. A major amount of a particulate filler which has been chemically modified to coreact with the crosslinked elastomer is incorporated into the sheet material. The binder preferably has incorporated therein an addition polymerized silane coupling agent. The sheet material is fabricated according to papermaking techniques. The sheet material is useful in the fabrication of gasketing and in heat shields.
Inventors
- 👤 Warren J. Bodendorf
- 👤 Thomas A. Podach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:16
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/102; B; B29; B29K; B29K2105/00; B29K2105/06; B29K2105/12; B29K2105/16; B29K2709/00
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
116 words
A high temperature resistant compressible water laid sheet material having a fibrous constituent and a thickness of 0.001 to 1 inch comprising: (a) 8 to 65 percent by weight of a binder including a crosslinkable elastomer and a silane coupling agent copolymerized within said binder at a level of at least about 2 percent by weight; (b) a crosslinking agent for said elastomer; (c) 15 to 70 percent by weight of a inorganic particulate filler which has been chemically modified to coreact with the crosslinked elastomer; and (d) 15 to 50 percent by weight of high temperature nonasbestos staple fibers; said material capable of withstanding service temperatures of 500° F. and being oil and water resistant.
Claim 2
Dependent Claim
116 words
A high temperature resistant compressible water laid sheet material having a fibrous constituent and a thickness of 0.001 to 1 inch comprising: (a) 8 to 65 percent by weight of a binder including a crosslinkable elastomer and a silane coupling agent copolymerized within said binder at a level of at least about 2 percent by weight; (b) a crosslinking agent for said elastomer; (c) 15 to 70 percent by weight of a inorganic particulate filler which has been chemically modified to coreact with the crosslinked elastomer; and (d) 15 to 50 percent by weight of high temperature nonasbestos staple fibers; said material capable of withstanding service temperatures of 500° F. and being oil and water resistant.
Claim 3
Dependent Claim
29 words
The material of claim 1 wherein said particulate filler is present at a level of 40 to 60 percent by weight based on the total weight of said material.
Claim 4
Dependent Claim
12 words
The material of claim 1 wherein the particulate filler is a clay.
Claim 5
Dependent Claim
16 words
The material of claim 1 wherein said particulate filler has been modified by a coupling agent.
Claim 6
Dependent Claim
14 words
The material of claim 4 wherein said coupling agent is a silane coupling agent.
Claim 7
Dependent Claim
29 words
The material of claim 5 wherein said silane coupling agent is selected from the group consisting of an amino functional silane coupling agent and a mercapto-functional silane coupling agent.
Claim 8
Dependent Claim
16 words
The material of claim 1 wherein the silane coupling agent is addition copolymerized with the elastomer.
Claim 9
Dependent Claim
13 words
The material of claim 1 having a thickness of 0.001 to 1/4 inch.
Claim 10
Dependent Claim
12 words
The method of claim 1 wherein said elastomer has acrylonitrile polymerized therein.
Claim 11
Dependent Claim
28 words
The method of claim 1 wherein said elastomer is present at a level of 8 to 35 percent by weight based on the weight of said sheet material.
Claim 12
Dependent Claim
20 words
The method of claim 1 wherein said binder includes 8 to 30 percent by weight of a crosslinkable nonelastomeric polymer.
Claim 13
Dependent Claim
14 words
The material of claim 1 including a silane coupling agent copolymerized with said elastomer.
Claim 14
Dependent Claim
15 words
The material of claim 11 including a silane coupling agent copolymerized with said non-elastomeric polymer.
Claim 15
Dependent Claim
26 words
The material of claim 1 wherein said crosslinking agent is selected from the group consisting of melamine formaldehyde resins, urea formaldehyde resins and resorcinol formaldehyde resins.
Claim 16
Dependent Claim
26 words
The material of claim 1 wherein said crosslinking agent is present at a level of 0.7-4 percent by weight based on the weight of said material.
Claim 17
Dependent Claim
13 words
The material of claim 1 wherein said high temperature staple fibers are inorganic.
Claim 18
Dependent Claim
19 words
The material of claim 1 wherein said high temperature fibers are capable of withstanding 1500° F. continuous service temperature.
Claim 19
Dependent Claim
13 words
The material of claim 17 wherein said fibers are composed of alumina/silica fibers.
Claim 20
Dependent Claim
20 words
The material of claim 1 wherein said fibers are present at a level of 20 to 30 percent by weight.
Claim 21
Dependent Claim
25 words
The material of claim 17 including a minor amount of fibers which are capable of withstanding 900° F. but not 1500° F. continuous service temperature.
Claim 22
Dependent Claim
16 words
The material of claim 20 wherein said fibers capable of withstanding 900° F. are glass microfibers.
Claim 23
Dependent Claim
32 words
The material of claim 20 wherein said fibers capable of withstanding 900° F. are present at a level of up to 8 percent by weight based on the weight of said material.
Claim 24
Dependent Claim
131 words
A high temperature resistant compressible water laid sheet material having a thickness of 0.001 to 1 inch comprising: 20 to 30 percent by weight of inorganic nonasbestos staple fibers having a service temperature in excess of 1500° F.; up to 8 percent by weight of inorganic staple fibers having a service temperature greater than 900° F. but not in excess of 1500° F.; 20to 30 percent by weight of a crosslinked elastomeric binder having a silane coupling agent polymerized therein at a level of at least about 2 percent by weight; and 40 to 50 percent by weight of an inorganic filler which has been modified to coreact with said elastomeric binder; said material capable of withstanding continuous service temperatures in excess of 500° F. and being oil and water resistant.
Claim 25
Dependent Claim
131 words
A high temperature resistant compressible water laid sheet material having a thickness of 0.001 to 1 inch comprising: 20 to 30 percent by weight of inorganic nonasbestos staple fibers having a service temperature in excess of 1500° F.; up to 8 percent by weight of inorganic staple fibers having a service temperature greater than 900° F. but not in excess of 1500° F.; 20to 30 percent by weight of a crosslinked elastomeric binder having a silane coupling agent polymerized therein at a level of at least about 2 percent by weight; and 40 to 50 percent by weight of an inorganic filler which has been modified to coreact with said elastomeric binder; said material capable of withstanding continuous service temperatures in excess of 500° F. and being oil and water resistant.
References Cited (Backward Citations)
US3036950A
Cited
US3109769A
Cited
US3567680A
Cited
US3649320A
Cited
US3834924A
Cited
US3847848A
Cited
US3957718A
Cited
US4143027A
Cited
US4225383A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |