US3833386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of prepairing porous ceramic structures by firing a polyurethane foam that is impregnated with inorganic material
Assignee: WR Grace and Co Conn
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Filing: 1972-07-07
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Granted: 1974-09-03
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Expires: 1992-07-07
Abstract
Abstract The invention disclosed is for ceramic foam structures prepared by reacting an isocyanate capped polyoxyethylene polyol reactant with large amounts of an aqueous reactant containing finely divided sinterable ceramic material. The resultant foams having the sinterable ceramic material dispersed thereon are heat treated to decompose the carrier foam under firing conditions which sinter the ceramic particles resulting in a rigid ceramic foam structure.
Inventors
- 👤 K Frisch
- 👤 L Wood
- 👤 P Messina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:30
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2068; B01D39/2093; C; C04; C04B; C04B38/00; C04B38/06; C04B38/0615; C04B38/062; C04B38/0625; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; Y; Y10; Y10S; Y10S264/00; Y10S264/17; Y10S264/36; Y10S264/48; Y10S264/77; Y10S521/00; Y10S521/918
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
88 words
The method of claim 1 wherein the capped polyoxyethylene polyol having a functionality greater than 2 is present in an amount from about 3 percent by weight up to 100 percent by weight, and an additional capped polyoxyethylene polyol having a terminal member with an isocyanate functionality of two is present in an amount from 0 percent up to about 97 percent by weight, and the second component includes about 20 to 1000 parts by weight of sinterable material per 100 parts by weight of said first component.
Claim 2
Dependent Claim
37 words
The method of claim 1 wherein the polyoxyethylene polyol moiety of the isocyanate capped member has a weight average molecular weight of about 200 to about 20,000, and a hydroxyl functionality of about 2 to about 6.
Claim 3
Dependent Claim
17 words
The method of claim 3 wherein the weight average molecular weight is about 600 to about 6,000.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein the foam is dried prior to firing.
Claim 5
Dependent Claim
20 words
The method of claim 3 wherein the ratio of moles H2O/moles NCO groups is from about 20 to about 200.
Claim 6
Independent Claim
77 words
A method for preparing ceramic foam structures having three-dimensional networks, said method consisting of, reacting a first component comprising isocyanate capped polyoxyethylene polyol having a reaction functionality equal to about two, a second component comprising aqueous reactant having sinterable material disposed therein, and a third component comprising a crosslinked agent having a reaction functionality greater than two, the ratio of moles H2O/moles NCO groups being about 6.5 to about 390 in said second and first components respectively.
Claim 7
Dependent Claim
16 words
The method of claim 7 wherein the crosslinking agent of the third component is a polyol.
Claim 8
Dependent Claim
16 words
The method of claim 7 wherein the crosslinking agent of the third component is a polythiol.
Claim 9
Dependent Claim
16 words
The method of claim 7 wherein the crosslinking agent of the third component is a polyisocyanate.
Claim 10
Dependent Claim
36 words
The method of claim 7 wherein the polyoxyethylene polyol moiety of the isocyanate capped member has an average molecular weight of about 200 to about 20,000, and a hydroxyl functionality of about 2 to about 6.
Claim 11
Dependent Claim
17 words
The method of claim 11 wherein the weight average molecular weight is about 600 to about 6,000.
Claim 12
Dependent Claim
20 words
The method of claim 7 wherein the ratio of moles H2O/moles NCO groups is from about 20 to about 200.
Claim 13
Dependent Claim
29 words
The method of claim 7 wherein the second component includes about 2 to 1000 parts by weight of sinterable material per 100 parts by weight of said first component.
Claim 14
Dependent Claim
16 words
The method of claim 7 wherein the crosslinking agent of the third component is a polyamine.
Claim 15
Dependent Claim
9 words
The product prepared by the method of claim 1.
Claim 16
Dependent Claim
9 words
The product prepared by the method of claim 7.
References Cited (Backward Citations)
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Cited
US2929800A
Cited
US3175918A
Cited
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Cited
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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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |