Introduction: Waka Hasegawa is a prominent inventor based in Tokyo, Japan, known for his significant contributions to the field of liquid developer technology. With an impressive portfolio of 29 patents, Hasegawa has established himself as a key figure in innovations that enhance imaging and printing technologies.

Latest Patents: Among his recent patents, Hasegawa has developed a liquid developer and method for manufacturing it. This innovative liquid developer contains a carrier liquid with a specific solubility parameter (SP value) of not more than 8.20, ensuring compatibility with toner particles that are insoluble in the carrier liquid. The toner particle is composed of a polyester resin featuring an acid value ranging from 5 mg KOH/g to 50 mg KOH/g and a number-average molecular weight between 3,500 and 20,000. Furthermore, the invention includes a toner particle dispersing agent that is a polymer with a primary amino group. The criteria for this polymer stipulate an amine value of 30 mg KOH/g to 200 mg KOH/g, as well as a specified ratio of acid groups to amino groups.

Another notable patent involves a liquid developer that contains a carrier liquid and a toner particle that is insoluble in it. This developer also incorporates a polymer having a primary amino group that is soluble in the carrier liquid, with specific chemical properties to optimize performance.

Career Highlights: Hasegawa's work is primarily associated with Canon Kabushiki Kaisha, where he has played a vital role in advancing the company's research and development efforts. His innovative solutions have not only enhanced Canon's product offerings but also contributed to the overall advancement of liquid development technology within the imaging industry.

Collaborations: Throughout his career, Hasegawa has collaborated with esteemed colleagues, including Masashi Hirose and Yasuaki Murai. Their teamwork has fostered an environment of creativity and innovation, pushing the boundaries of existing technologies and enabling new developments in the field.

Conclusion: Waka Hasegawa stands out as a leading inventor in liquid developer technology. His extensive patent portfolio highlights his commitment to innovation and excellence. As he continues to collaborate with talented individuals within Canon, Hasegawa paves the way for future advancements that will likely shape the industry for years to come.

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