Keiichi Ishikawa

Selected Consulting Projects Long-term technical advisor for a Chinese toner manufacturer developing styrene-acrylic binder resins. Supported polymer quality stabilization and troubleshooting for multiple Asian manufacturers. Developed standardized polymerization SOPs and engineering training materials. Designed a polymer platform for multiple toner resin grades.

Since July 2025, employed as a contract researcher at ZACROS Corporation, Product Development Division 2, Adhesive Function Development Group. Responsible for adhesive property evaluation, measurement accuracy improvement, knowledge sharing of testing methods, and proposing experimental approaches, while currently undergoing OJT training to acquire adhesive formulation design skills. １，粘着物性評価 ・粘着樹脂の基礎物性（ゲル分、粘弾性、Haze などの光学特性）の測定および精度確認を実施。 ・粘着樹脂の基礎物性測定で Gel 分、粘弾性測定、Hase などの光学特性の測定、精度の確認を行う。 ・将来的には粘着剤設計ができるよう、OJT を通じて技術習得中。

Evaluate adhesive properties and improve measurement accuracy. Propose experimental approaches and contribute to testing method optimization. Currently expanding expertise in adhesive formulation design.

From 2023, worked as an independent consultant and advisor, providing expertise in polymer development, chemical product markets, recycled resin utilization, international trade, and accounting software. In parallel, pursued English language studies to improve academic communication skills in preparation for overseas opportunities (IELTS preparation). 会社都合により退職、現在コンサルタント。 リスキリングのためIELTS 6.0を目標に自己研鑽中。

Recognized for strong performance in previous roles and joined Samsung Japan Research Institute in 2013 to work on technical R&D of toner resins and development of conductive resins for organic photoconductors.  In 2017, transferred to HP Japan following the acquisition of the Samsung division. Engaged in the development of polyester resins for polymerized toner and recycled PET–based toner resins, contributing to the creation of energy-efficient and environmentally sustainable printing materials. 前職での高い実績が評価され、2013 年に株式会社 Samsung 日本研究所へ転職。トナー樹脂の技術研究開発 や、オーガニックフォトコンダクター用導電性樹脂の開発に従事しました。 ※ 2017 年、Samsung 部門の買収により株式会社日本 HP に転籍。新たな環境でリサイクル PET 含有トナー用樹脂開発 や重合トナーの研究開発に従事し、省エネルギー化・環境配慮製品の実現に貢献。

Led development of polyester resins for polymerized toner applications. Developed recycled PET-based toner resins contributing to sustainable materials. Designed conductive resins for organic photoconductors. Collaborated with global teams across Asia and North America.

Joined Mitsui Chemicals, Inc. (formerly Mitsui Toatsu Chemicals, Inc.) in April 1984. Engaged in R&D of toner resins, successfully developing and commercializing three new toner resin products in response to corporate needs.  Later transferred to the Toner Group of the Electronic & Information Materials Division at headquarters, handling toner resin sales, market research for functional chemicals, and chemical management operations. 研究：25年：ポリエステル樹脂、スチレンアクリル樹脂、エポキシ樹脂の分子設計、機能付与。工場立ち上げ。海外工場立ち上げ。 営業：5年：上記樹脂の販売。海外は主にアジア圏 化学品管理：5年：海外科学法規制、法規制管理、輸出管理

Developed and commercialized three types of toner binder resin products. Designed polyester, styrene-acrylic, and polyether polymers. Managed international technical support for customers in Korea, China, and India. Contributed to scale-up, process optimization, and production startup.