Patent US2676166A successfully refreshed from Google Patents.
Patent US2965584A successfully refreshed from Google Patents.
US2965584A
Expired / Lapsed
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Preparation of foamed hydrophilic polyurethanes using pyrrolidone catalysts
Assignee: ATK Launch Systems LLC
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Filing: 1957-03-27
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Granted: 1960-12-20
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Expires: 1977-03-27
Abstract
No abstract record available.
Inventors
- 👤 Harold L Elkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:15
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/166; C08G18/168; C08G18/28; C08G18/40; C08G18/4009; C08G18/4018; C08G18/48; C08G18/4833; C08G2110/00; C08G2110/0041; C08G2110/005; C08G2110/0058; C08G2110/0083; C08J2375/00; C08J2375/04; C08J2471/00; Y; Y10; Y10S; Y10S521/00; Y10S521/905; Y10S528/00; Y10S528/904
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
IN A METHOD FOR THE MANUFACTURE OF POLYURETHANE FOAMED PLASTICS BY REACTION OF ORGANIC DIISOCYANATES WITH BLENDS OF POLYALKYLENE GLYCOLS HAVING MOLECULAR WEIGHTS OF 600 TO 6,000 AND LINER POLYESTERS WHICH ARE ESSENTIALLY CONDENSATION PRODUCTS OF POLYHYDRIC ALCOHOLS AND POLYCARBOXYLIC ACIDS IN THE PRESENCE OF WATER, A WETTING AGENT AND A CATALYST AND CURING OF THE FOAMED PLASTIC, THE WEIGHT RATIO OF SAID POLYGLYCOL TO SAID POLYESTER BEING BETWEEN ABOUT 0.6:1 AND 1.5:1, THE IMPROVEMENT WHICH COMPRISES USING AS SAID CATALYST FROM 1% TO 10% BY WEIGHT OF THE REACTION MIXTURE OF A PYRROLIDONE SELECTED FROM THE GROUP CONSISTING OF 2-PYRROLIDONE, N-METHYLPYRROLIDONE AND VINYLPYRROLIDONE TO PROVIDE A FOAM HAVING IMPROVED HYDROPHILIC PROPERTIES.
Claim 2
Dependent Claim
112 words
IN A METHOD FOR THE MANUFACTURE OF POLYURETHANE FOAMED PLASTICS BY REACTION OF ORGANIC DIISOCYANATES WITH BLENDS OF POLYALKYLENE GLYCOLS HAVING MOLECULAR WEIGHTS OF 600 TO 6,000 AND LINER POLYESTERS WHICH ARE ESSENTIALLY CONDENSATION PRODUCTS OF POLYHYDRIC ALCOHOLS AND POLYCARBOXYLIC ACIDS IN THE PRESENCE OF WATER, A WETTING AGENT AND A CATALYST AND CURING OF THE FOAMED PLASTIC, THE WEIGHT RATIO OF SAID POLYGLYCOL TO SAID POLYESTER BEING BETWEEN ABOUT 0.6:1 AND 1.5:1, THE IMPROVEMENT WHICH COMPRISES USING AS SAID CATALYST FROM 1% TO 10% BY WEIGHT OF THE REACTION MIXTURE OF A PYRROLIDONE SELECTED FROM THE GROUP CONSISTING OF 2-PYRROLIDONE, N-METHYLPYRROLIDONE AND VINYLPYRROLIDONE TO PROVIDE A FOAM HAVING IMPROVED HYDROPHILIC PROPERTIES.
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) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |