Unitika Ltd.

Toda Kogyo Corporation

Tsutomu Sakaida

Masahide Hirai

Hiroyuki Uejima

Yoshiaki Echigo

Eiichi Kurita

Toshiyuki Hakata

Kazuo Fujioka

Shigeru Takaragi

Keiichi Asami

Tetsuro Toda

Souichiro Kishimoto

Disclosed herein are composite carrier particles for electrophotography comprising 80 to 99% by weight of ferromagnetic fine particles and a phenol resin, and having a number-average particle diameter of 10 to 1,000 .mu.m, a bulk density of not more than 2.0 g /cm.sup.3, and a curved surface configuration, and a process for producing the same.

Composite carrier particles for electrophotography and process for

An etherified phenolic chelate resin prepared by stabilizing and protecting the chelate groups of a phenolic chelate resin and then converting some or all of the phenolic hydroxyl groups into either groups; a process for the production of the etherified phenolic chelate resin; and a method for separating a heavy metal ion from an aqueous solution having a pH of at least 7 by using this etherified phenolic chelate resin.

Process for removing heavy-metal ions from aqueous solution

An etherified phenolic chelate resin prepared by stabilizing and protecting the chelate groups of a phenolic chelate resin and then converting some or all of the phenolic hydroxyl groups into ether groups; a process for the production of the etherified phenolic chelate resin; and a method for separating a heavy metal ion from an aqueous solution having a pH of at least 7 by using this etherified phenolic chelate resin.

Etherified phenolic chelate resin, process for its production, and

Growing community of inventors

Uji, Japan

Tsutomu Sakaida