Dainippon Ink and Chemicals, Incorporated

Kawamura Institute of Chemical Research

Yuji Ohashi

Masataka Ooka

Ren-Hua Jin

Seungtaeg Lee

The present invention provides a comb-shaped epoxy resin represented by the following formula (1): in the formula (1), Xand Xrepresent a divalent group having a residue selected from xanthene residue, biphenylene residue, hydrogenated bisphenol residue, alkylene residue and polyoxyalkylene residue, each may having a methyl group or a ethyl group as a substituent, and at least one of them is an aromatic residue, Y represents a polymer chain such as linear polymer chain, a number average polymerization degree being 5 to 2000, and n (number average polymerization degree) represents an integer within a range of 3 to 200, and to a method for preparing the comb-shaped epoxy resin.

Comb-shaped epoxy resin and method for preparing comb-shaped epoxy resin

Bipyrrolinonylidene-type compound, colorant therewith, and method of production thereof

The methacrylic ester polymers produced according to this invention are uniquely distinguished from the radically prepared polymers of similar composition by the fact that both polymers produced: by anionic living polymerization and by deactivating the active terminals of anionic living polymers; contain acetal and/or ketal groups as the blocked hydroxyl groups and have narrow molecular weight distribution. Hydroxyl group-containing methacrylic acid ester polymers are produced by hydrolysis of the above-mentioned polymers. The anionic living polymers are produced in high yields by anionically polymerizing methacrylic acid esters containing an acetal or ketal group in the presence of initiators such as alkaline metal alkoxides. The polymers of the present invention can be used in various fields of applications such as coatings and adhesives. The polymers of the present invention yield curable high solids compositions.

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Sakura, Japan

Yuji Ohashi