US4014809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for obtaining a polyol-containing homogeneous liquid composition useful for the production of rigid polyurethane foam from a rigid polyurethane foam
Assignee: Bridgestone Corp
•
Filing: 1975-12-19
•
Granted: 1977-03-29
•
Expires: 1995-12-19
Abstract
Abstract A process for obtaining a polyol-containing homogeneous liquid composition, which can be directly reused as a polyol component for the production of rigid polyurethane foam, from a rigid polyurethane foam, which comprises treating said foam at a temperature of from 150° to 220° C in the presence of a mixture of (a) an aliphatic diol having 4-7 carbon atoms and having a boiling point higher than 160° C and (b) a monoalkanolamine having 2 to 8 carbon atoms, the amount of said monoalkanolamine (b) present in said mixture being within the range of from 1 to 20 percent by weight.
Inventors
- 👤 Osamu Kondo
- 👤 Torao Hashimoto
- 👤 Hajime Hasegawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:25
CPC Classifications
C; C08; C08J; C08J11/00; C08J11/04; C08J11/10; C08J11/18; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
A process for obtaining a polyol-containing homogeneous liquid composition, which can be directly reused as a polyol component for the production of rigid polyether polyurethane foam, from a rigid polyurethane foam, which comprises treating said rigid polyurethane foam at a temperature of from 150° to 220° C in the presence of a mixture of (a) an aliphatic diol having 4-7 carbon atoms and having a boiling point higher than 160° C and (b) a monoalkanolamine having 2-8 carbon atoms, the amount of said monoalkanolamine (b) present in said mixture being within the range of from 1 to 20 percent by weight.
Claim 2
Dependent Claim
101 words
A process for obtaining a polyol-containing homogeneous liquid composition, which can be directly reused as a polyol component for the production of rigid polyether polyurethane foam, from a rigid polyurethane foam, which comprises treating said rigid polyurethane foam at a temperature of from 150° to 220° C in the presence of a mixture of (a) an aliphatic diol having 4-7 carbon atoms and having a boiling point higher than 160° C and (b) a monoalkanolamine having 2-8 carbon atoms, the amount of said monoalkanolamine (b) present in said mixture being within the range of from 1 to 20 percent by weight.
Claim 3
Dependent Claim
29 words
A process according to claim 1, wherein said aliphatic diol (a) is at least one member selected from the class consisting of diethylene glycol, dipropylene glycol, 1,4-butanediol and 1,5-pentanediol.
Claim 4
Dependent Claim
12 words
A process according to claim 1, wherein said monoalkanolamine (b) is monoethanolamine.
Claim 5
Dependent Claim
35 words
A process according to claim 1, wherein the amount of the monoalkanolamine present in the mixture of the aliphatic diol and the monoalkanolamine is within the range of from 2 to 10 percent by weight.
Claim 6
Dependent Claim
28 words
A process according to claim 1, wherein the temperature for treating the rigid polyurethane foam for the degradation is within the range of from 160° to 210° C.
References Cited (Backward Citations)
US3143515A
Cited
US3114722A
Cited
US3300417A
Cited
US3378497A
Cited
US3404103A
Cited
US3441616A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-28 | 1980-09-27 | 1981-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-28 | 1984-09-27 | 1985-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-28 | 1988-09-27 | 1989-03-29 | $7700.00 | Window Closed / Lapsed |