US3389095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for stabilizing phenolic foam with alkylene oxide and product obtained therefrom
Assignee: Dow Chemical Co
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Filing: 1963-12-16
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Granted: 1968-06-18
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Expires: 1983-12-16
Abstract
No abstract record available.
Inventors
- 👤 Walter L Garrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:17
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; C08J2361/00; C08J2361/04; C08J2361/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
IN A PROCESS FOR THE PREPARATION OF A SOLID PHENOLIC FOAM FROM A COMPOSITION COMPRISING A LIQUID PHENOLFORMALDEHYDE RESOLE RESIN, A BLOWING AGENT AND AN ACIDIC CATALYST, THE IMPROVEMENT WHICH CONSISTS OF: (A) ADDING TO THE LIQUID RESOLE RESIN AS THE ACIDIC CATALYST A STRONG ORGANIC ACID COMPRISING AT LEAST 30 MOLE PRECENT OF AN AROMATIC SULFONIC ACID. (B) HOLDING THE LIQUID RESIN COMPOSITION AT A TEMPERATURE IN THE RANGE FROM ABOUT 20* TO 100*C. FOR A TIME SUFFICIENT TO FORM A SOLID RESILIENT PHENOLIC FOAM. (C) TREATING THE PHENOLIC FOAM WHILE IN THE RESILIENT FORM WITH A SUFFICIENT AMOUNT OF A GASEOUS NITROGEN BASE TO MAKE THE FOAM ALKALINE, AND (D) OXYALKYLATING THE RESIDUAL PHENOLIC OH GROUPS OF THE ALKALINE FOAM WITH A C2-C4 ALKYLENE OXIDE.
Claim 2
Dependent Claim
127 words
IN A PROCESS FOR THE PREPARATION OF A SOLID PHENOLIC FOAM FROM A COMPOSITION COMPRISING A LIQUID PHENOLFORMALDEHYDE RESOLE RESIN, A BLOWING AGENT AND AN ACIDIC CATALYST, THE IMPROVEMENT WHICH CONSISTS OF: (A) ADDING TO THE LIQUID RESOLE RESIN AS THE ACIDIC CATALYST A STRONG ORGANIC ACID COMPRISING AT LEAST 30 MOLE PRECENT OF AN AROMATIC SULFONIC ACID. (B) HOLDING THE LIQUID RESIN COMPOSITION AT A TEMPERATURE IN THE RANGE FROM ABOUT 20* TO 100*C. FOR A TIME SUFFICIENT TO FORM A SOLID RESILIENT PHENOLIC FOAM. (C) TREATING THE PHENOLIC FOAM WHILE IN THE RESILIENT FORM WITH A SUFFICIENT AMOUNT OF A GASEOUS NITROGEN BASE TO MAKE THE FOAM ALKALINE, AND (D) OXYALKYLATING THE RESIDUAL PHENOLIC OH GROUPS OF THE ALKALINE FOAM WITH A C2-C4 ALKYLENE OXIDE.
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) | 1971-06-18 | 1971-12-18 | 1972-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-18 | 1975-12-18 | 1976-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-18 | 1979-12-18 | 1980-06-18 | $7700.00 | Window Closed / Lapsed |