US4101704A
Expired / Lapsed
US
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Energy absorbing materials
Assignee: BTG International Ltd
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Filing: 1976-10-29
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Granted: 1978-07-18
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Expires: 1996-10-29
Abstract
Abstract A novel elastomer having a very low compression set and a very slow recovery from compression comprises a flexible polyurethane of essentially linear structure containing unsatisfied hydroxyl groups, and is the reaction product of a substantially linear polyol having hydroxyl end groups and a molecular weight in the range 6000 to 12000, with an isocyanate in less than stoichiometric amount. This elastomer can be used as one layer of an energy-absorbing material, in combination with a more difficultly compressible layer comprising a tough flexible polymeric matrix having a plurality of rigid hollow bodies embedded therein.
Inventors
- 👤 Maurice Arthur Frederick Hiles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:32
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/40; B60; B60R; B60R19/00; B60R19/02; B60R19/18; B60R19/22; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4825; C08L; C08L75/00; C08L75/04; B32B2307/00; B32B2307/50; B32B2307/554; B32B2307/56; B32B2307/70; B32B2307/712; B32B2605/00; C08G2350/00; Y; Y10; Y10S; Y10S264/00; Y10S264/06; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/249921; Y10T428/249953; Y10T428/249971; Y10T428/249974; Y10T428/25; Y10T428/252; Y10T428/31504; Y10T428/31551; Y10T428/31554; Y10T428/31591
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
69 words
An energy-absorbing material which comprises an elastomer layer of polymeric material having a low compression set and a delayed recovery from compression, in combination with a more difficultly compressible layer, said last mentioned layer comprising a tough flexible polymeric matrix having a plurality of substantially unbroken rigid hollow bodies embedded therein the arrangement being such that under the action of deforming forces deformation of the layers takes place sequentially.
Claim 2
Dependent Claim
69 words
An energy-absorbing material which comprises an elastomer layer of polymeric material having a low compression set and a delayed recovery from compression, in combination with a more difficultly compressible layer, said last mentioned layer comprising a tough flexible polymeric matrix having a plurality of substantially unbroken rigid hollow bodies embedded therein the arrangement being such that under the action of deforming forces deformation of the layers takes place sequentially.
Claim 3
Dependent Claim
17 words
An energy-absorbing material as claimed in claim 1 having an outer skin resistant to abrasion and weathering.
Claim 4
Dependent Claim
12 words
The material claimed in claim 2 wherein the outer skin is polyurethane.
Claim 5
Dependent Claim
18 words
The material claimed in claim 2 wherein the outer skin has a thickness of 1/16 to 1/2 inch.
Claim 6
Dependent Claim
12 words
The material claimed in claim 1 mounted on a rigid backing member.
Claim 7
Dependent Claim
17 words
The combination of claim 5 wherein the more difficulty compressible layer is adjacent to the backing member.
Claim 8
Dependent Claim
23 words
The material claimed in claim 1 wherein the more difficulty compressible layer contains 10 to 60% of said rigid hollow bodies by weight.
Claim 9
Dependent Claim
20 words
The material claimed in claim 1 wherein said bodies have an average diameter in the range 50 to 400 microns.
Claim 10
Dependent Claim
26 words
The material claimed in claim 1 wherein the elastomeric layer and the more difficultly compressible layers have respective thickness in the range 3 to 6 inches.
Claim 11
Dependent Claim
12 words
The material claimed in claim 1 wherein said matrix comprises a polyurethane.
Claim 12
Dependent Claim
57 words
The material claimed in claim 1 wherein the elastomer layer is composed of a composition which comprises a flexible polyurethane of essentially linear structure containing unsatisfied hydroxyl groups, and having a compression set less than 15%, an elongation at break of at least 500%, and a recovery which is delayed after compression by at least 0.7 sec.
Claim 13
Dependent Claim
63 words
The material claimed in claim 1 wherein the elastomer layer is composed of a composition having a low compression set and a delayed recovery from compression comprising the reaction product of a substantially linear polyol having hydroxyl end groups and a molecular weight in the range 6000 to 12,000, and an isocyanate in less than stoichiometric amount, the elastomer containing unsatisfied OH groups.
Claim 14
Dependent Claim
15 words
The material claimed in claim 1 wherein said bodies are composed of a phenolic resin.
Claim 15
Dependent Claim
13 words
The material claimed in claim 1 wherein said bodies are composed of glass.
Claim 16
Dependent Claim
13 words
The material claimed in claim 1 wherein said bodies are composed of silica.
Claim 17
Dependent Claim
13 words
The material claimed in claim 1 wherein said bodies are composed of carbon.
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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) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |