JPS56122836A - Method for dissolving polyurethane - Google Patents
Method for dissolving polyurethaneInfo
- Publication number
- JPS56122836A JPS56122836A JP2651080A JP2651080A JPS56122836A JP S56122836 A JPS56122836 A JP S56122836A JP 2651080 A JP2651080 A JP 2651080A JP 2651080 A JP2651080 A JP 2651080A JP S56122836 A JPS56122836 A JP S56122836A
- Authority
- JP
- Japan
- Prior art keywords
- polyurethane
- solvent
- solution
- elapse
- aldehyde
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Processes Of Treating Macromolecular Substances (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
PURPOSE: To enable to reuse waste polymer, by dissolving solid polyurethane in a polar org. solvent in a high concn. by adding an aldehyde and an acidic compound to obtain a low-viscosity solution with reduced change with the elapse of time.
CONSTITUTION: In dissolving solid polyurethane, especially, polyurethane urea in a polar org. solvent (e.g.; isopropyl alcohol or the like), an aldehyde (e.g.; chloroacetaldehyde or the like) and an acidic compound (e.g.; hydrochloric acid or the like) are added and, pref., said polyurethane urea is dissolved in polar org solvent in which a metal salt (e.g.; CaCl2 or the like) or an ammonium salt (e.g.; NH4Cl or the like) is further added. Thereby, a low-viscosity polyurethane solution with reduced change with the elapse of time is obtained in a high concn. of 10W40%. Waste yarn or waste polymer formed in a process for producing elastic fiber, synthetic leather, film or the like is dissolved again to prepare said polyurethane solution for reuse.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2651080A JPS56122836A (en) | 1980-03-05 | 1980-03-05 | Method for dissolving polyurethane |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2651080A JPS56122836A (en) | 1980-03-05 | 1980-03-05 | Method for dissolving polyurethane |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS56122836A true JPS56122836A (en) | 1981-09-26 |
JPH0122291B2 JPH0122291B2 (en) | 1989-04-26 |
Family
ID=12195468
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2651080A Granted JPS56122836A (en) | 1980-03-05 | 1980-03-05 | Method for dissolving polyurethane |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56122836A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0537579A1 (en) * | 1991-10-17 | 1993-04-21 | Sumitomo Bayer Urethane Co., Ltd. | Method for decomposing polymer having urethane and/or urea bonds |
WO2023161692A1 (en) | 2022-02-25 | 2023-08-31 | Toray Opelontex Co., Ltd | Polyurethane elastic fiber |
WO2023175568A1 (en) | 2022-03-18 | 2023-09-21 | Toray-Opelontex Co., Ltd. | Polyurethane elastic fiber and method for producing such |
WO2023175565A1 (en) | 2022-03-17 | 2023-09-21 | Toray-Opelontex Co., Ltd. | Polyurethane elastic fiber and method for producing such |
-
1980
- 1980-03-05 JP JP2651080A patent/JPS56122836A/en active Granted
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0537579A1 (en) * | 1991-10-17 | 1993-04-21 | Sumitomo Bayer Urethane Co., Ltd. | Method for decomposing polymer having urethane and/or urea bonds |
WO2023161692A1 (en) | 2022-02-25 | 2023-08-31 | Toray Opelontex Co., Ltd | Polyurethane elastic fiber |
WO2023175565A1 (en) | 2022-03-17 | 2023-09-21 | Toray-Opelontex Co., Ltd. | Polyurethane elastic fiber and method for producing such |
WO2023175568A1 (en) | 2022-03-18 | 2023-09-21 | Toray-Opelontex Co., Ltd. | Polyurethane elastic fiber and method for producing such |
Also Published As
Publication number | Publication date |
---|---|
JPH0122291B2 (en) | 1989-04-26 |
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