Hiroaki Nakao

Title: Hiroaki Nakao: Innovations in Polyacetal and Trioxane Production

Introduction

Hiroaki Nakao is an inventor based in Fuji, Japan. His patent work addresses polymer production and catalyst technology, with a focus on improving process quality, yield, and stability. He is associated with Polyplastics Co., Ltd. and Clariant Catalysts (Japan) K.K. His portfolio includes 4 patents.

Latest Patents

Nakao’s listed patents include “Method for Producing Polyacetal Copolymer.” The invention describes a continuous process that supplies trioxane, a copolymerizable comonomer, and a non-volatile protonic acid to a reactor. After polymerization, unreacted monomer is vaporized and returned to the feed, while the polyacetal copolymer is collected downstream. A basic compound is then added, and the mixture is melt-kneaded to deactivate the acid.

Another listed invention, “Solid Phosphoric Acid Catalyst, and Method for Producing Trioxane,” concerns a catalyst for gas-phase trioxane synthesis from formaldehyde. The catalyst contains silicon phosphate oxide formed by sintering a phosphoric-acid-treated carrier at a temperature of at least 200°C. The patent describes limiting total acidity to no more than 5 mmol per gram, as measured by NH-TPD, to suppress side reactions, reduce organic deposits on the catalyst, and support stable, long-term operation.

Career Highlights

Nakao’s disclosed work connects polymer manufacturing with catalyst development. His polyacetal process focuses on monomer recovery and acid deactivation, while his trioxane catalyst invention targets improved selectivity and sustained catalyst performance. His company affiliations include Polyplastics Co., Ltd. and Clariant Catalysts (Japan) K.K.

Collaborations

Nakao’s listed coworkers include Xin Chen and Yoshihisa Tajima. Their names are associated with his collaborative patent work.

Conclusion

Hiroaki Nakao’s patent portfolio reflects practical innovations in polyacetal copolymer production and trioxane synthesis, emphasizing process control, product quality, and catalyst stability.