JPS56122836A - Method for dissolving polyurethane - Google Patents

Method for dissolving polyurethane

Info

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
Application number
JP2651080A
Other languages
Japanese (ja)
Other versions
JPH0122291B2 (en
Inventor
Akihiro Kurashima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TOYO PROD KK
TOYO PURODAKUTSU KK
Original Assignee
TOYO PROD KK
TOYO PURODAKUTSU KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by TOYO PROD KK, TOYO PURODAKUTSU KK filed Critical TOYO PROD KK
Priority to JP2651080A priority Critical patent/JPS56122836A/en
Publication of JPS56122836A publication Critical patent/JPS56122836A/en
Publication of JPH0122291B2 publication Critical patent/JPH0122291B2/ja
Granted legal-status Critical Current

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
JP2651080A 1980-03-05 1980-03-05 Method for dissolving polyurethane Granted JPS56122836A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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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