Hitachi, Ltd.

Yuri Kajihara

Takahito Muraki

Jun Nunoshige

Takeshi Kondo

Yasuhiko Tada

In a conventional self-healing material, although the resin properties after self-healing are restored to the same level as the initial refractoriness and strength of the resin, no further extension of life can be expected. A resin cured product according to the present invention includes: a first vinyl monomer having an ester bond; a second vinyl monomer having a hydroxyl group; a transesterification reaction catalyst; and a boron compound.

Resin cured product, electrical device, motor, transformer, cable sheath, mobile, structure, and method for healing resin cured product

This invention is intended to synthesize a multi-branched polymer, which has an uniform molecular chain lengths and is free from branch defects, without the need for purification. This invention is also intended to synthesize a polyfunctional radical polymerization initiator represented by Formula 1: wherein n is an integer of 1 or larger; Y is a polyfunctional unsaturated compound; Ris a hydrocarbon group; Ris a structure in which one molecule of a radically polymerizable unsaturated hydrocarbon compound is bound to Rand the oxygen atom; Xof B&#x2014;X(boron-X) bond is an alkoxy or phenyl group; and Xof B&#x2014;X(boron-X) bond is an alkoxy or phenyl group.

Radical polymerization initiator, multi-branched polymer, varnish, adhesive agent, coating material, sealing material, semiconductor, and electronic device

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Tokyo, Japan

Yuri Kajihara