US4115298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for splitting up polyurethane waste into activated polyhydroxyl compounds
Assignee: Bayer AG
•
Filing: 1976-09-16
•
Granted: 1978-09-19
•
Expires: 1996-09-16
Abstract
Abstract The instant invention relates to a new process for splitting up polyurethane waste into activated polyhydroxyl compounds which may be reused for the production of polyurethane plastics. The process broadly comprises reacting the polyurethane waste with lactams or equilibrium associates of lactams and active hydrogen containing compounds at temperatures of from 150° to 250° C. If desired, the process may be conducted under elevated pressure.
Inventors
- 👤 Gottfried Schneider
- 👤 Kuno Wagner
- 👤 Heinz Wolfgang Patzelt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:10
CPC Classifications
C; C08; C08J; C08J11/00; C08J11/04; C08J11/10; C08J11/18; C08J11/28; C08J2375/00; C08J2375/04; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
49 words
A process for splitting up cellular and non-cellular polyurethanes into liquid reusable polyhydroxyl compounds for an isocyanate polyaddition process comprising reacting the polyurethanes at 150 ° to 250° C., with lactam melts or equilibrium associates of lactams and water or organic materials containing at least two Zerewitinoff-active hydrogen atoms.
Claim 2
Dependent Claim
49 words
A process for splitting up cellular and non-cellular polyurethanes into liquid reusable polyhydroxyl compounds for an isocyanate polyaddition process comprising reacting the polyurethanes at 150 ° to 250° C., with lactam melts or equilibrium associates of lactams and water or organic materials containing at least two Zerewitinoff-active hydrogen atoms.
Claim 3
Dependent Claim
26 words
The process of claim 1, wherein the reaction is conducted under an elevated pressure of from about 4 to 50 bar when said water is present.
Claim 4
Dependent Claim
55 words
The process of claim 1, wherein the lactams used correspond to the general formula ##STR5## wherein: m represents 0 or an integer of from 1 to 9, and R represents an aliphatic radical containing 1 to 10 carbon atoms, araliphatic radical containing 6 to 12 carbon atoms, a pyridine radical or a lower-alkyl-substituted pyridine radical.
Claim 5
Dependent Claim
18 words
The process of claim 3, wherein R represents an aliphatic radical of from 1 to 10 carbon atoms.
Claim 6
Dependent Claim
30 words
The process of claim 1, wherein equilibrium associates of ε-caprolactam with a compound selected from the group consisting of ethylene glycol, diethylene glycol, diethanolamine, triethanolamine and N-methyl diethanolamine, is used.
Claim 7
Dependent Claim
26 words
The process of claim 1, wherein the reaction is accelerated by the addition of 0.0005 to 4% by weight based on the polyurethane of a catalyst.
Claim 8
Dependent Claim
41 words
The process of claim 2, wherein the reaction mixture is exposed for 5 to 60 minutes to a temperature of 200°-250° C and/or to the action of basic catalysts in order to at least partly polymerize the lactam used into polyamides.
Claim 9
Dependent Claim
15 words
The process of claim 2, wherein the reaction is performed continuously in a screw extruder.
Claim 10
Dependent Claim
27 words
The process of claim 2, wherein from 0.5 to 1 part by weight of polyurethane is used for each part of weight of lactam or equilibrium associate.
Claim 11
Dependent Claim
8 words
The product of the process of claim 2.
Claim 12
Dependent Claim
63 words
In an isocyanate addition process wherein an organic isocyanate is reacted with an active hydrogen containing material, the improvement wherein at least a portion of the active hydrogen containing compound is a material produced by reacting a polyurethane at 150° to 250° C. with lactam melts or equilibrium associates of lactam and water or organic materials containing at least two Zerewitinoff-active hydrogen atoms.
Claim 13
Dependent Claim
63 words
In an isocyanate addition process wherein an organic isocyanate is reacted with an active hydrogen containing material, the improvement wherein at least a portion of the active hydrogen containing compound is a material produced by reacting a polyurethane at 150° to 250° C. with lactam melts or equilibrium associates of lactam and water or organic materials containing at least two Zerewitinoff-active hydrogen atoms.
Claim 14
Dependent Claim
43 words
The process of claim 11, wherein the lactams used correspond to the general formula: ##STR6## wherein: m represents 0 or an integer of from 1 to 9, and R represents an aliphatic radical, araliphatic radical, a pyridine radical or a lower-alkyl-substituted pyridine radical.
Claim 15
Dependent Claim
8 words
The product of the process of claim 12.
References Cited (Backward Citations)
US2917471A
Cited
US2937151A
Cited
US3632530A
Cited
US3867373A
Cited
GB1391891A
Cited
US3738946A
Cited
US3708440A
Cited
DE2238667A1
Cited
US3983087A
Cited
US4014809A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |