Clover Mfg. Co., Ltd.

Hymo Corporation

Aiko Suzuki

Go Honda

An iminodiacetic acid type chelate resin which can be easily and efficiently produced and which can efficiently adsorb and separate metal ions; and a method for producing the same are developed. The use of a chelate rein having a carboxymethyl group introduced into primary amino groups of the polyvinylamine crosslinked polymer particles can facilitate the efficient adsorption and separation of metal ions in water. The chelate resin can be obtained by a production method in which an N-vinyl carboxylic acid amide is suspension polymerized with a crosslinkable monomer in salt water in the presence of a dispersant thereby to obtain a polyvinyl carboxylic acid amide crosslinked polymer particles, and the obtained polyvinyl carboxylic acid amide crosslinked polymer is hydrolyzed to thereby introduce a carboxymethyl group into primary amino groups of the polyvinylamine crosslinked polymer particles.

Iminodiacetic acid type chelate resin and method for producing same

A multi-columned needlewoven strip comprising two or three columns each formed of a series of loops of surface yarns and disposed side-by-side in which each of the loops of a surface yarn forming one column has a pair of loop-closing portions interlocked with another surface yarn forming another column disposed adjacent to the one column; and the multi-columned needlewoven strip is formed by a method which comprises steps of: threading core yarns respectively through respective eyes formed in a lower end of each of weaving needles so as to provide cores each hanging down from the respective lower ends of the needles; forming a slip knot in a lower end of each of the surface yarns; sliding the slip knot onto each of the needles; wounding the surface yarns around the respective needles to form columns of loops so that each of the loops of the one column is formed with a pair of loop-closing portions interlocked with the cooperating surface yarn forming the other column, and sliding down the columns onto the core yarns to form the multi-columned needlewoven strip.

Growing community of inventors

Tokyo, Japan

Aiko Suzuki