US3919128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Urethane-modified polyisocyanurate foams
Assignee: Zeneca Inc
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Filing: 1974-07-23
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Granted: 1975-11-11
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Expires: 1994-07-23
Abstract
Abstract A fire-retardant, urethane modified, polyisocyanurate foam having a percent friability of about 60 percent or less and a weight retention of greater than about 70 percent is disclosed. These foams are prepared by including in the foam-forming composition at least one compound which is an alkoxylated bisphenol.
Inventors
- 👤 James P Baldino
- 👤 Joseph Feltzin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:31
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/09; C08G18/092; C08G18/28; C08G18/40; C08G18/48; C08G18/487; C08G18/4879; C08G18/50; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
A FIRE-RETARDANT, POLYISOCYANURATE FOAM HAVING A WEIGHT RETENTION OF GREATER THAN ABOUT 70 PERCENT AND A PERCENT FRIABILITY OF ABOUT 60 PERCENT OR LESS, SAID FOAM COMPRISING THE REACTION PRODUCT OF A COMPOSITION COMPRISING AN ORGANIC POLYISOCYANATE HAVING A FUNCTIONALITY EQUAL TO AT LEAST ABOUT 2.0 AND A MOLECULAR WEIGHT EQUAL TO AT LEAST ABOUT 160, AN ISOCYANURATE CATALYST, A BLOWING AGENT, A SURFACTANT AND A POLYOL, SAID POLYOL HAVING THE FOLLOWING FORMULA:
Claim 2
Dependent Claim
73 words
A FIRE-RETARDANT, POLYISOCYANURATE FOAM HAVING A WEIGHT RETENTION OF GREATER THAN ABOUT 70 PERCENT AND A PERCENT FRIABILITY OF ABOUT 60 PERCENT OR LESS, SAID FOAM COMPRISING THE REACTION PRODUCT OF A COMPOSITION COMPRISING AN ORGANIC POLYISOCYANATE HAVING A FUNCTIONALITY EQUAL TO AT LEAST ABOUT 2.0 AND A MOLECULAR WEIGHT EQUAL TO AT LEAST ABOUT 160, AN ISOCYANURATE CATALYST, A BLOWING AGENT, A SURFACTANT AND A POLYOL, SAID POLYOL HAVING THE FOLLOWING FORMULA:
Claim 3
Dependent Claim
26 words
A foam, as claimed in claim 1, wherein the sum of a and b in said polyol is equal to from about 5 to about 10.
Claim 4
Dependent Claim
22 words
A foam, as claimed in claim 1, wherein the sum of a and b in said polyol is equal to about 6.
Claim 5
Dependent Claim
22 words
A foam, as claimed in claim 1, wherein the sum of a and b in said polyol is equal to about 9.
Claim 6
Dependent Claim
14 words
A foam, as claimed in claim 1, wherein a blend of polyols is employed.
Claim 7
Dependent Claim
17 words
A foam, as claimed in claim 5, wherein in one polyol in said blend R'' is ethylene.
Claim 8
Dependent Claim
28 words
A foam, as claimed in claim 5, wherein in one polyol in said blend R'' is ethylene and in a second polyol in said blend R'' is propylene.
Claim 9
Dependent Claim
37 words
A foam, as claimed in claim 1, wherein the amount of catalyst employed in said composition is equal to from about 1 to about 10 parts by weight per 100 parts by weight of the total formulation.
Claim 10
Dependent Claim
28 words
A foam, as claimed in claim 1, wherein the amount of blowing agent in said composition is sufficient to produce a foam having a nominal density of 2PCF.
Claim 11
Dependent Claim
35 words
A foam, as claimed in claim 1, wherein the amount of surfactant in said composition is equal to from about 0.5 to 1.0 parts by weight per 100 parts by weight of the total formulation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |