Sumitomo Electric Industries, Limited

Sumitomo Electric Wintec, Inc.

Yudai Furuya

Masaaki Yamauchi

Kengo Yoshida

Hideaki Saito

Yuji Hatanaka

Jun Sugawara

Shinya Ota

Yasushi Tamura

Shuhei Maeda

The resin composition according to one aspect is a resin composition containing a polyamic acid and a solvent, wherein the polyamic acid has a repeating unit represented by the following general formula (1) in a molecular chain, and the molecular chain has a structure represented by the following general formula (2) at one end or both ends. The proportion of the structure represented by the following general formula (2) relative to 1 mol of the repeating unit represented by the following general formula (1) is 0.001 mol or more and 0.1 mol or less. In the following general formulas, Ris a tetravalent organic group; Ris a divalent organic group; and Ris an organic group having 15 or less carbon atoms.

Resin composition, method for producing resin composition, and insulated electrical wire

An insulated electric wire includes a linear conductor and one or a plurality of insulating layers formed on an outer peripheral surface of the conductor. At least one of the one or plurality of insulating layers contains a plurality of pores, outer shells are disposed on peripheries of the pores, and the outer shells are derived from shells of hollow-forming particles having a core-shell structure. A varnish for forming an insulating layer contains a resin composition forming a matrix and hollow-forming particles having a core-shell structure and dispersed in the resin composition. In the varnish, cores of the hollow-forming particles contain a thermally decomposable resin as a main component, and shells of the hollow-forming particles contain a main component having a higher thermal decomposition temperature than the thermally decomposable resin.

Insulated electric wire and varnish for forming insulating layer

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Koka, Japan

Yudai Furuya