Title:
METHOD FOR RECOVERING FIBROUS FILLER AND ε-CAPROLACTAM, AND METHOD FOR PRODUCING POLYAMIDE 6
Document Type and Number:
WIPO Patent Application WO/2023/074433
Kind Code:
A1
Abstract:
Provided is a method for recovering a highly pure fibrous filler and ε-caprolactam from a polyamide 6 resin composition, which contains the fibrous filler, only by solid-liquid separation. The present invention pertains to a method for recovering a fibrous filler and ε-caprolactam, said method comprising adding and contacting a polyamide 6 resin composition (A) containing at least the fibrous filler (D) with water (B) heated to 290-350°C inclusive and/or an aqueous polyamide 6 oligomer solution (B1) heated to 290-350°C inclusive to give a mixture (C) and then recovering the fibrous filler and ε-caprolactam from the mixture (C), characterized in that the following steps (a) to (c) are performed in this order. (a) A step for preparing the mixture (C) under such condition that, when the mass ratio of water to polyamide 6, etc. is X:1 and the reaction temperature is Y°C, then the product of X and Y is 2,000 or less. (b) A step for performing solid-liquid separation (I). (c) A step for washing the material on the filter.
Inventors:
YAMASHITA KOHEI (JP)
TAKAHASHI AKIHIRO (JP)
KATO MASASHI (JP)
NISHIMURA MIHOKO (JP)
KATO KOYA (JP)
TAKAHASHI AKIHIRO (JP)
KATO MASASHI (JP)
NISHIMURA MIHOKO (JP)
KATO KOYA (JP)
Application Number:
PCT/JP2022/038577
Publication Date:
May 04, 2023
Filing Date:
October 17, 2022
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
International Classes:
C08J11/10; B09B3/00; B29B17/00; C07D201/12
Foreign References:
| JP2000034363A | 2000-02-02 | |||
| JPH10287645A | 1998-10-27 | |||
| JPH1087872A | 1998-04-07 | |||
| US5457197A | 1995-10-10 | |||
| JPH11508913A | 1999-08-03 | |||
| JP2000034362A | 2000-02-02 | |||
| JPH10510282A | 1998-10-06 | |||
| JP2000191638A | 2000-07-11 | |||
| JP2019533041A | 2019-11-14 | |||
| JPH08217746A | 1996-08-27 | |||
| JPH10510280A | 1998-10-06 | |||
| JPH10510282A | 1998-10-06 |
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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