POLYESTER IMIDE RESIN BASED VARNISH FOR LOW-PERMITTIVITY COATING

WIPO Patent Application WO/2012/026438

A1

Provided are: a varnish capable of forming a low-permittivity insulating layer which comprises a polyester imide as the main component; and an insulated wire in which a low permittivity is attained using the varnish. The varnish comprises, as the main component, a polyester imide resin obtained by reacting a carboxylic component that consists of a carboxylic acid component containing a dicarboxylic acid, or an anhydride or alkyl ester thereof with an alcohol component and a diamine compound. In the polyester imide resin, the monomer composition is regulated so as to give a molar ratio (OH/COOH) of the hydroxyl of the alcohol component to the carboxyl of the carboxylic component of 1.9 or less, or the content of imido (which exhibits high polarizability) per unit polyester imide molecular chain is reduced by increasing the molecular weights of the starting monomers. It is preferable to use, as the starting monomers, a carboxylic acid component containing a dicarboxylic acid having a molecular weight of 167 or more and/or a diamine compound having a molecular weight of 250 or more.

SAITO HIDEAKI (JP)
FURUYA YUDAI (JP)
YOSHIDA KENGO (JP)
HATANAKA YUJI (JP)

PCT/JP2011/068902

March 01, 2012

August 23, 2011

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SUMITOMO ELECTRIC INDUSTRIES (JP)
SUMITOMO ELECTRIC WINTEC INC (JP)
SAITO HIDEAKI (JP)
FURUYA YUDAI (JP)
YOSHIDA KENGO (JP)
HATANAKA YUJI (JP)

C08G18/34; H01B3/30; C08G73/16; C08L61/06; C08L79/08; C09D5/25; C09D179/08; H01B7/02

JP2010070698A	2010-04-02
JPH08218007A	1996-08-27
JPS57209967A	1982-12-23
JP2005526357A	2005-09-02
JP2001500902A	2001-01-23
JPH11501687A	1999-02-09
JPH10152647A	1998-06-09
JPH09268223A	1997-10-14

KAMITANI Eriko (JP)
Eriko Kamiya (JP)

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