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Patent US3674717A successfully refreshed from Google Patents.
US3674717A
Expired / Lapsed
US
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Polyurethane foams prepared from oxyethylated starch-phosphorus-containing polyethers
Assignee: Olin Corp
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Filing: 1970-10-05
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Granted: 1972-07-04
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Expires: 1990-10-05
Abstract
Abstract Flame-retardant polyurethane foams having open cells are prepared from a polyether polyol, an organic polyisocyanate, a foaming agent and a catalyst, wherein the polyether polyol is oxyethylated starch-phosphorus-containing polyether.
Inventors
- 👤 Stephen Fuzesi
- 👤 Milton Lapkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:26
CPC Classifications
C; C08; C08B; C08B31/00; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/487; C08G18/4883; C08G18/50; C08G18/5075; C08G18/5081; C08G18/5084; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
23 words
The polyurethane foam of claim 1 wherein said starch is selected from the group consisting of potato starch, corn starch and mixtures thereof.
Claim 2
Dependent Claim
36 words
The polyurethane foam of claim 2 wherein the proportion of said phosphoric acid is equivalent to between about 1.5 and about 3 moles of P2O5 equivalents in said phosphoric acid per glucose unit weight of starch.
Claim 3
Dependent Claim
20 words
The polyurethane foam of claim 3 wherein said phosphoric acid has a concentration of about 100% by weight of H3PO4.
Claim 4
Dependent Claim
19 words
The polyurethane foam of claim 3 wherein said polyether has a hydroxyl number of between about 300 and 800.
Claim 5
Dependent Claim
98 words
The polyurethane foam of claim 2 wherein the proportion of ethylene oxide is equivalent to between about 0.9 and about 3.5 moles of ethylene oxide per mole of hydroxyl radicals present in said mixture, and prior to recovering said polyether, there are added to the resulting mixture d. a catalytic proportion of an acid catalyst, e. additional starch in a proportion less than that effective for solidification of the reaction mixture and, f. additional ethylene oxide equivalent to between about 0.9 and about 3.5 moles of ethylene oxide per mole of hydroxyl radical present in the reaction mixture.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |