Title:
POLYESTER FILM RECOVERY METHOD, RECYCLED POLYESTER PRODUCT, RECOVERY DEVICE, AND FUNCTIONAL LAYER REMOVAL AGENT
Document Type and Number:
WIPO Patent Application WO/2021/199895
Kind Code:
A1
Abstract:
The polyester film recovery method includes a functional layer removal step (A) of cleaning with a cleaning agent a layered polyester film comprising a functional layer on the surface of a polyester film, thereby removing the functional layer, and a recovery step (B) of recovering the polyester film wherefrom the functional layer has been removed, the polyester film recovery method being characterized in that the cleaning agent is selected from among (1) to (3). (1) A cleaning agent containing a compound having (a) an alkalinizing agent, and (b) at least one hydroxyl group.
(2) A cleaning agent having (a) an alkalinizing agent, and (c) a compatibilizing agent.
(3) A cleaning agent having an alcohol species whereof the acidity constant (pKa) is between 8.0 and 20.0 inclusive.
The invention can provide a polyester film recovery method, a recovery device, and a functional layer removal agent, which allow the functional layer to be detached, and allow the base material film to be recovered.
Inventors:
TADA KAZUNOBU (JP)
HIRAKI TOSHIHIRO (JP)
SUZUKI TOMOHIRO (JP)
KURODA KIYONORI (JP)
HIRAKI TOSHIHIRO (JP)
SUZUKI TOMOHIRO (JP)
KURODA KIYONORI (JP)
Application Number:
PCT/JP2021/008540
Publication Date:
October 07, 2021
Filing Date:
March 04, 2021
Export Citation:
Assignee:
MITSUBISHI CHEM CORP (JP)
International Classes:
C08J11/08; B29B17/00; B29B17/02
Foreign References:
| JP2009291690A | 2009-12-17 | |||
| JPH07266337A | 1995-10-17 | |||
| JP2005132901A | 2005-05-26 | |||
| JP2002265665A | 2002-09-18 | |||
| JP2005298354A | 2005-10-27 | |||
| JP2005321537A | 2005-11-17 | |||
| JP2010065230A | 2010-03-25 |
Attorney, Agent or Firm:
TAGUCHI, Masahiro et al. (JP)
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