Hirohisa Yoshiura

Title: Hirohisa Yoshiura: Polyolefin Processing and Pigment Composition Patents.

Introduction

Hirohisa Yoshiura is an inventor associated with Kurashiki, Japan, and Mitsubishi Chemical Industries Limited. His patent work includes innovations in polyolefin processing and polymer compositions containing pigments and ultraviolet-absorbing agents. He is credited with 2 patents.

Latest Patents

Yoshiura’s listed patents address polymer production and material formulation.

- **Process for Preparing Polyolefin.** This invention concerns preparing polyolefin by polymerizing an olefin with a highly active Ziegler catalyst in an inert-gas-sealed system. The process separates polyolefin containing catalyst residues from the polymerization mixture, then treats it with a weakly reactive gas, such as oxygen and/or steam diluted with an inert gas.

- **Pigment Containing Polyolefin Composition.** This patent describes a polymer composition containing a quinophthalone pigment and 0.005–5% by weight of a piperidine-type or imidazolidine-type ultraviolet-absorbing agent. The pigment’s quinoline and aromatic rings may include specified substituents, including halogen, lower alkyl, lower alkoxy, and carboxyl groups.

Career Highlights

Yoshiura’s listed inventions reflect work on both polyolefin manufacturing and the formulation of polymer materials. The first patent focuses on treating catalyst-containing polyolefin after polymerization, while the second combines a specified pigment with an ultraviolet-absorbing agent.

Collaborations

Yoshiura’s listed coworkers include Masao Miyake and Toshiharu Arai. His company affiliation is Mitsubishi Chemical Industries Limited.

Conclusion

Hirohisa Yoshiura’s patent record highlights contributions to polyolefin processing and pigment-containing polymer compositions, with both inventions associated with his work at Mitsubishi Chemical Industries Limited.