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Company profile

Company name
Polyplastics Co., Ltd.
May 4, 1964 (Founded on June 26, 1962)
Head office
JR Shinagawa East Bldg., 18-1, Konan 2-chome, Minato-ku, Tokyo 108-8280, Japan
Phone / Fax no
Phone: +81-3-6711-8600,
Fax: +81-3-6711-8606
Toshio Shiwaku, President and CEO
3 billion yen

DAICEL CORPORATION (Shareholding 100%)

Manufacturing and selling of various types of engineering plastics and polymers
  • Acetal copolymer (POM)
  • Polybutylene terephthalate (PBT)
  • Fiberglass Reinforced Polyethylene terephthalate (GF-PET)
  • Liquid crystal polymer (LCP)
  • Polyphenylene sulfide (PPS)
  • Cyclic olefin copolymer (COC)
Net sales (consolidated)
135,447 million yen (2019)
Number of Polyplastics
Group Employees
2,131 (March 2020)

Non-consolidated Basis

Fiscal Year 2019



Fiscal Year 2018



Fiscal Year 2017




Toshio Shiwaku
Representative Director and President
Yuki Yoneda
Representative Director
Hidekage Kojima*
Yoshihiro Komachi*
Noriaki Yokoo
Corporate Auditor
Yuji Iguchi
Corporate Auditor (part-time)
Shigeru Tazawa*
Outside Corporate Auditor
Chizuko Yamamoto*
Outside Corporate Auditor

Toshio Shiwaku

Responsible for Internal Audit Dept.

Managing Executive Officer

Yuki Yoneda

General Manager of Corporate Support Div., Responsible for Risk Management and Corporate Compliance

Managing Executive Officer

Masamichi Mitsuuchi

General Manager of Production Div., Representative Director of PTM Holdings, Inc., Responsible for PAP, PTW, PTM, PNL and PolyplaService Co., Ltd. and Safety and Environment

Managing Executive Officer

Tohru Katsumata

General Manager of Research and Development Div., Responsible for Quality, Concurrently, the Chief of Technical Solution Center, from Nov. 1, 2020 to Feb. 28, 2021

Managing Executive Officer

Takashi Miyamoto

General Manager of Marketing and Sales Div., Responsible for Selling Affiliates

Managing Executive Officer

Masaaki Nakamura

General Manager of Supply Chain Div.

Executive Officer

Kohji Ohishi

Chief of Production Technology Center, Respontible for LCPG

Executive Officer

Mitsunori Matsushima

General Manager of Innovation and Business Development Div.

Executive Officer

Hiroyuki Yazawa

Deputy General Manager of Marketing and Sales Div. and Chief of Japan Business Unit, Nagoya Branch Office Manager

Executive Officer

Keisuke Gotoh

General Manager of Corporate Strategy Div., Responsible for TAP


Akihiro Izuka

Deputy General Manager of Research and Development Div., Responsible for Quality and Technology Impruvement


Yoshihisa Tajima

Deputy General Manager of Research and Development Div.


Masanori Sakano

Deputy General Manager of Marketing and Sales Div., Osaka Branch Office Manager

Effective on October 10, 2020

*Outside Director

Note: Abbreviated names for overseas group companies

Abbreviation, Official company name Location of Head Office
PTM: PTM Engineering Plastics (Nantong) Co., Ltd. China/Nantong
PNL: Polyplastics (Nantong) Ltd. China/ Nantong
PAP: Polyplastics Asia Pacific Sdn. Bhd. Malaysia/ Kuala Lumpur
PTW: Polyplastics Taiwan Ltd. Taipei
LCPG: LCP Leuna Carboxylation Plant GmbH Germany/ Saxony-Anhalt
TAP: TOPAS Advanced Polymers GmbH Germany/ Raunheim

Organization ChartPrint (PDF) Organization chart

Affiliates Relationship DiagramPrint (PDF) Affiliates Relationship Diagram