Title:
METHOD OF PRODUCING THERMOPLASTIC RESIN
Document Type and Number:
WIPO Patent Application WO/2023/074438
Kind Code:
A1
Abstract:
Provided is a method for producing a thermoplastic resin by using ε-caprolactam obtained by performing depolymerization of a waste product of a polyamide 6 resin composition molded article by using only a small amount of water, etc., and using less energy. The present invention pertains to a method that is for producing a thermoplastic resin and that involves obtaining ε-caprolactam through steps (a) and (b) by using as a material a waste product (A) of a resin molded article at least containing polyamide 6, and polymerizing a material containing the obtained ε-caprolactam. (a) A step for adding the waste product (A) of the resin molded article to, so as to bring into contact with, water (B) heated to 290-350°C or a polyamide 6 oligomer aqueous solution (B1) heated to 290-350°C.
(b) A step for separating the reaction mixture obtained in the step (a) into solid matter and an ε-caprolactam aqueous solution through solid-liquid separation (I).
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/JP2022/038587
Publication Date:
May 04, 2023
Filing Date:
October 17, 2022
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
International Classes:
C08J11/10; C07D201/12
Foreign References:
| JPH11508913A | 1999-08-03 | |||
| US5457197A | 1995-10-10 | |||
| JPH10510282A | 1998-10-06 | |||
| JPH11323006A | 1999-11-26 | |||
| JPH11511485A | 1999-10-05 | |||
| JP2000191638A | 2000-07-11 | |||
| JPH0632936A | 1994-02-08 | |||
| JPH10287645A | 1998-10-27 | |||
| 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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