US3208957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyol polyurethane foams with trimethylolpropane based hydroxyl supplying components
Assignee: Celanese Corp
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Filing: 1961-02-01
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Granted: 1965-09-28
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Expires: 1981-02-01
Abstract
No abstract record available.
Inventors
- 👤 Thomas M Powanda
- 👤 Edward J Hensch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:20
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4829; C08G18/08; C08G18/10; C08G18/16; C08G18/18; C08G18/1825; C08G2110/00; C08G2110/0025; C08G2110/0041; C08G2110/005; C08G2110/0083
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A PROCESS FOR PRODUCING RIGID POLYURETHANE FOAMS WITH GOOD HEAT DISTORTION RESISTANCE PROPERTIES AND HIGH COMPRESSIVE STRENGTH COMPRISING (1) PREPARING A PREPOLYMER IN TWO STEPS FROM AN ARYLENE DIISOCYANATE AND A POLYETHER TRIOL WHICH IS A TRIMETHYLOLPROPANE PROPYLENE OXIDE CONDENSATION PRODUCT, SAID STEPS CONSIST OF REACTING SAID ARYLENE DIISOCYANATE WITH ONE HALF OF SAID POLYETHER TRIOL AT A TEMPERATURE OF ABOUT 60*C., THEN REACTING THE RESULTING PRODUCT WITH THE SECOND HALF OF SAID POLYETHER TRIOL AT A TEMPERATURE OF ABOUT 90*C., (2) PREPARING A BLEND OF TRIMETHYLOLPROPANE AND ADDITIONAL POLYETHER TRIOL, AND (3) MIXING SAID PREPOLYMER WHICH IS THE ISOCYANATE-SUPPLYING COMPONENT WITH SAID BLEND WHICH IS THE HYDROXYSUPPLYING COMPONENT WITH WATER AND DIMETHYLETHANOLAMINE CATALYST.
Claim 2
Dependent Claim
114 words
A PROCESS FOR PRODUCING RIGID POLYURETHANE FOAMS WITH GOOD HEAT DISTORTION RESISTANCE PROPERTIES AND HIGH COMPRESSIVE STRENGTH COMPRISING (1) PREPARING A PREPOLYMER IN TWO STEPS FROM AN ARYLENE DIISOCYANATE AND A POLYETHER TRIOL WHICH IS A TRIMETHYLOLPROPANE PROPYLENE OXIDE CONDENSATION PRODUCT, SAID STEPS CONSIST OF REACTING SAID ARYLENE DIISOCYANATE WITH ONE HALF OF SAID POLYETHER TRIOL AT A TEMPERATURE OF ABOUT 60*C., THEN REACTING THE RESULTING PRODUCT WITH THE SECOND HALF OF SAID POLYETHER TRIOL AT A TEMPERATURE OF ABOUT 90*C., (2) PREPARING A BLEND OF TRIMETHYLOLPROPANE AND ADDITIONAL POLYETHER TRIOL, AND (3) MIXING SAID PREPOLYMER WHICH IS THE ISOCYANATE-SUPPLYING COMPONENT WITH SAID BLEND WHICH IS THE HYDROXYSUPPLYING COMPONENT WITH WATER AND DIMETHYLETHANOLAMINE CATALYST.
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) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |