US4243560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovering polyols from scrap polyurethane foam
Assignee: Centro Ricerche Fiat SCpA
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Filing: 1979-04-04
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Granted: 1981-01-06
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Expires: 1999-04-04
Abstract
Abstract Scrap foam of flexible or semi-rigid polyurethane is pyrolized at 450 DEG -800 DEG C., preferably 600 DEG C., in the absence of air and of any added reactive agents or catalysts. The residence time may be from 3 minutes to one hour, preferably about 5 minutes. A distillate is obtained comprising an aqueous phase and an organic phase. The latter essentially consists of alcohols and polyols and may be re-used as such for preparing polyurethane resins.
Inventors
- 👤 Augusto Balestrini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:47
CPC Classifications
C; C10; C10B; C10B53/00; C10B53/07; Y; Y02; Y02P; Y02P20/00; Y02P20/141; Y02P20/143
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
A method of recovering polyols from scrap polyurethane foam by thermal treatment, comprising the steps of: pyrolizing a comminuted scrap foam of a flexible or semi-rigid polyurethane at a temperature of from about 450° C. to about 800° C. with a residence time at the temperature of from about 3 minutes to about 1 hour in the absence of air in the absence of any added reactive agents or catalysts; at the same time collecting and condensing the gaseous decomposition products evolving from the mass being pyrolized, thereby obtaining a liquid condensate comprising a heavy aqueous phase and a light organic phase; and recovering the organic phase.
Claim 2
Independent Claim
107 words
A method of recovering polyols from scrap polyurethane foam by thermal treatment, comprising the steps of: pyrolizing a comminuted scrap foam of a flexible or semi-rigid polyurethane at a temperature of from about 450° C. to about 800° C. with a residence time at the temperature of from about 3 minutes to about 1 hour in the absence of air in the absence of any added reactive agents or catalysts; at the same time collecting and condensing the gaseous decomposition products evolving from the mass being pyrolized, thereby obtaining a liquid condensate comprising a heavy aqueous phase and a light organic phase; and recovering the organic phase.
Claim 3
Dependent Claim
16 words
A method according to claim 1, wherein the temperature is from 500° C. to 700° C.
Claim 4
Dependent Claim
12 words
A method according to claim 2, wherein the temperature is 600° C.
Claim 5
Dependent Claim
21 words
A method according to claim 2 or 3, wherein the residence time at the stated temperature is 5 to 10 minutes.
Claim 6
Dependent Claim
30 words
A method according to claim 1, 2 or 3, wherein the method includes reacting the recovered organic phase without purification treatment with an organic diisocyanate to produce a polyurethane resin.
Claim 7
Dependent Claim
27 words
A method according to claim 4, wherein the method includes reacting the recovered organic phase without purification treatment with an organic diisocyanate to produce a polyurethane resin.
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) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |