US5266694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nylon component reclamation
Assignee: Invista North America LLC
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Filing: 1992-10-19
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Granted: 1993-11-30
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Expires: 2012-10-19
Abstract
Abstract A process is disclosed for simultaneously depolymerizing nylon 6 and nylon 6,6 and reclaiming the monomer values by steam distillation.
Inventors
- 👤 Edward F. Moran, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:24
CPC Classifications
C; C07; C07D; C07D201/00; C07D201/02; C07D201/12; C07C; C07C209/00; C07C209/62; C08; C08J; C08J11/00; C08J11/04; C08J11/10; C08J11/14; C08J2377/00; C08J2377/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
87 words
A process for depolymerizing a mixture of nylon 6 and nylon 6,6 comprising the steps of: (a) establishing a molten polymer system including: (i) up to 75 percent nylon 6 and 25-100 weight percent nylon 6,6; and (ii) basic nylon depolymerizing catalyst in an amount of 1-50 weight percent, based on the total weight of the polymer, at a temperature of 250° to 400° C.; (b) conducting steam through the molten polymer system; (c) condensing the steam to obtain a mixture of water, caprolactam, and hexamethylene diamine.
Claim 2
Dependent Claim
87 words
A process for depolymerizing a mixture of nylon 6 and nylon 6,6 comprising the steps of: (a) establishing a molten polymer system including: (i) up to 75 percent nylon 6 and 25-100 weight percent nylon 6,6; and (ii) basic nylon depolymerizing catalyst in an amount of 1-50 weight percent, based on the total weight of the polymer, at a temperature of 250° to 400° C.; (b) conducting steam through the molten polymer system; (c) condensing the steam to obtain a mixture of water, caprolactam, and hexamethylene diamine.
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein the basic nylon depolymerizing catalyst is selected from the group consisting of alkali metal hydroxides and alkaline earth metal hydroxide.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein the molten polymer system includes 25-75 weight percent nylon 6 and 25-75 weight percent nylon 6,6.
Claim 5
Dependent Claim
71 words
A process for depolymerizing nylon 6,6 comprising the steps of (a) establishing a molten polymer system including: (i) nylon 6,6; and (ii) basic nylon depolymerizing catalyst in an amount of 1-50 weight percent, based on the total weight of the polymer, at a temperature of 250° to 400° C.; (b) conducting steam through the molten polymer system; and (c) condensing the steam to obtain a mixture of water and hexamethylene diamine.
Claim 6
Dependent Claim
71 words
A process for depolymerizing nylon 6,6 comprising the steps of (a) establishing a molten polymer system including: (i) nylon 6,6; and (ii) basic nylon depolymerizing catalyst in an amount of 1-50 weight percent, based on the total weight of the polymer, at a temperature of 250° to 400° C.; (b) conducting steam through the molten polymer system; and (c) condensing the steam to obtain a mixture of water and hexamethylene diamine.
Claim 7
Dependent Claim
26 words
The process of claim 4 wherein the basic nylon depolymerizing catalyst is selected from the group consisting of alkali metal hydroxides and alkaline earth metal hydroxide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-29 | 1997-05-31 | 1997-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-29 | 2001-05-31 | 2001-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-29 | 2005-05-31 | 2005-11-30 | $7700.00 | Window Closed / Lapsed |