US4077921A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sprayable low density ablator and application process
Assignee: National Aeronautics and Space Administration
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Filing: 1977-01-19
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Granted: 1978-03-07
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Expires: 1997-01-19
Abstract
Abstract A sprayable, low density ablative composition consisting essentially of:
Inventors
- 👤 Max H. Sharpe
- 👤 William E. Hill
- 👤 William G. Simpson
- 👤 James M. Carter
- 👤 Edwin L. Brown
- 👤 Harry M. King
- 👤 Paul H. Schuerer
- 👤 David D. Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:13
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/32; B; B64; B64G; B64G1/00; B64G1/22; B64G1/52; B64G1/58; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/83; C08G18/833; F; F42; F42B; F42B15/00; F42B15/34; B64G1/14; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
119 words
A sprayable low density ablator composition consisting essentially of: (a) 100 parts by weight of a mixture of 25-65% by weight of phenol formaldehyde microballoons, 0-20% by weight of glass microballoons, 4-10% by weight of glass fibers, 25-45%% by weight of an epoxy-modified polyurethane resin wherein said polyurethane is produced by the reaction of 2,4-toluene diisocyanate and polytetramethylene glycol ether and epoxy modifier is bisphenol A diglycidyl ether, ethylene glycol digycidyl ether or glycerol diglycidyl ether or a mixture thereof, 2-4% by weight of a bentonite dispersing aid and 1-2% by weight of an alcohol activator for the bentonite; (b) 1-10 parts by weight of an aromatic amine curing agent; and (c) 200-400 parts by weight of a solvent.
Claim 2
Dependent Claim
119 words
A sprayable low density ablator composition consisting essentially of: (a) 100 parts by weight of a mixture of 25-65% by weight of phenol formaldehyde microballoons, 0-20% by weight of glass microballoons, 4-10% by weight of glass fibers, 25-45%% by weight of an epoxy-modified polyurethane resin wherein said polyurethane is produced by the reaction of 2,4-toluene diisocyanate and polytetramethylene glycol ether and epoxy modifier is bisphenol A diglycidyl ether, ethylene glycol digycidyl ether or glycerol diglycidyl ether or a mixture thereof, 2-4% by weight of a bentonite dispersing aid and 1-2% by weight of an alcohol activator for the bentonite; (b) 1-10 parts by weight of an aromatic amine curing agent; and (c) 200-400 parts by weight of a solvent.
Claim 3
Dependent Claim
31 words
The composition of claim 1, wherein the phenolic microballoons are from phenolformaldehyde resin, having a sphere diameter distribution of 0.0002-0.005 inch and a density of 6.5 lb per ft 3 .
Claim 4
Dependent Claim
28 words
The composition of claim 1, wherein the glass microballoons are of water-insoluble alkali-metal silicate-based glass of 10-750 microns in sphere diameter and a density of 0.3g per cc.
Claim 5
Dependent Claim
36 words
The composition of claim 1, wherein the glass fibers are a mixture of fibers having a diameter of approximately 0.00051 inch and 1/16-1/4 inch in length and wherein said fibers are pretreated with the aminosilane agent.
Claim 6
Dependent Claim
22 words
The composition of claim 1, wherein the epoxy-modified polyurethane is derived from 2,4-toluendiisocyanate and poly(tetramethylene glycol)ether and the epoxy-modifier bisphenol-A dicylycidyl ether.
Claim 7
Dependent Claim
13 words
The composition of claim 1, wherein the activator for said bentonite is ethanol.
Claim 8
Dependent Claim
19 words
The composition of claim 1, wherein the aromatic amine curing agent is m-phenylenediamine or p-methylenedianiline or a mixture thereof.
Claim 9
Dependent Claim
17 words
The composition of claim 1, wherein the solvent is methylene chloride or perchloroethylene or a mixture thereof.
Claim 10
Dependent Claim
149 words
The composition of claim 1, wherein the phenol formaldehyde microballoons are from phenolformaldehyde resin, have a sphere diameter distribution of 0.0002-0.005 inch and a density of 6.5 lb per cc; the glass microballoons are of water-insoluble alkalimetal silicate-based glass of 10-750 microns in sphere diameter and a density of 0.3 g per cc; the glass fibers are a mixture of fibers of approximately 1/16 - 1/4 inch in length and wherein said fibers are pretreated with the aminosilane agent; the epoxy-modified polyurethane is derived from a polyether (such as poly(tetramethylene glycol)ether) and a diisocyanate, such as 2,4-toluenediisocyanate and the epoxy-modifier is bisphenol A diglycidyl ether, ethylene glycol diglycidyl ether or glycerol diglycidyl ether or a mixture thereof; the activator for said bentonite is ethanol; the aromatic amine curing agent is m-phenylenediamine or p-methylenedianiline or a mixture thereof; and the solvent is methylene chloride or perchloroethylene or a mixture thereof.
Claim 11
Dependent Claim
124 words
The composition of claim 9, wherein the mixture (a) consists essentially of 35-40% by weight of said phenol formaldehyde microballoons, 10-15% by weight of said glass microballoons, 1-2% by weight of 1/4 inch chopped glass fibers, 2-5% by weight of 1/16 inch milled glass fibers; and 30-40% by weight of said epoxy-modified polyurethane resin wherein said polyurethane is produced by the reaction of 2,4-toluene diisocyanate and polytetramethylene glycol ether and epoxy modifier is bisphenol A diglycidyl ether, ethylene glycol digycidyl ether or glycerol diglycidyl ether or a mixture thereof; and said composition further contains 2-7 parts by weight of a mixture of m-phenylene diamine and p-methylenedianiline and 274-325 parts by weight of a 1:2 to 2:1 mixture by volume of methylene chloride and perchloroethylene.
References Cited (Backward Citations)
US3317455A
Cited
US3755223A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |