Nitto Electric Industrial Co., Ltd.

Yasuhiro Suzuki

Katsuhiko Yamaguchi

Yuzuru Noda

Hiroshi Shibata

Makoto Kojima

Makoto Komima

Toshihide Okamoto

A method for stabilizing a water-soluble resin composition which comprises adding, as a stabilizing agent, a carbonate and/or an organic carboxylate of a basic nitrogenous compound to the water-soluble composition in an amount of from about 0.01 to about 10 parts by weight based on 100 parts by weight of the resin content in the water-soluble composition, the water-soluble composition being prepared by condensation reacting an acid component consisting of 1,2,3,4-butane tetracarboxylic acid alone or a polycarboxylic acid component containing at least about 50 mol% of 1,2,3,4-butane tetracarboxylic acid and a diamine in the presence of a water-soluble solvent or, optionally, in the presence of the water-soluble solvent and water to obtain a condensation product having a residual acid value ratio of about 3 to about 50% of the acid value before condensation followed by formation of a salt of the condensation product with a basic nitrogenous compound.

Salts of a basic nitrogenous compound as stabilizers for neutralized

A polyester having imide rings in the molecule comprising the reaction product of (1) a polyhydric alcohol component comprising an imide ring containing diol represented by the formula (I) ##STR1## wherein Ar.sub.1 represents a trivalent aromatic group; Ar.sub.2 represents a divalent aromatic group; and m and n each represents an integer of 1 to 6; with the diol comprising the reaction product of 2 moles of an aromatic tricarboxylic acid anhydride of the formula (II) ##STR2## wherein Ar.sub.1 has the same meaning as above, with 1 mole of a diamine of the formula (III)

Imide-ring containing polyester and wire enamel containing same

A heat resistant resin solution comprising (1) at least one solvent selected from the group consisting of alcohols, polyhydric alcohols, polyhydric alcohol derivatives, ketones, ethers and esters, (2) aqueous ammonia and (3) a polymer having a residual acid value of about 5 to 40% obtained by reaction of a 1,2,3,4-butanetetracarboxylic acid, an aromatic tricarboxylic acid anhydride and a diamine in the presence of a polyhydric alcohol and a method of preparation of the heat resistant resin solution.

Heat resistant resin solution and method for preparation thereof

An imide-ring containing polyester comprising the reaction product of (A) (1) a dicarboxylic acid of the formula ##EQU1## wherein R.sub.1 represents a divalent organic group, R.sub.2 represents a trivalent organic group, and n.gtoreq.1, the dicarboxylic acid of the formula (I) comprising the reaction product of 1 mole of an imide compound having terminal amino groups of the formula (II) ##EQU2## wherein R.sub.1 has the same meaning as above, or of an imide precursor thereof, with 2 moles of a tricarboxylic acid anhydride of the formula (III) ##EQU3## wherein R.sub.2 has the same meaning as above, the imide compound of the formula (II) being prepared by reacting n moles of 1,2,3,4-butanetetracarboxylic acid (hereinafter referred to as BTC) with (n+1) moles of a diamine of the formula (IV)

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Ibaraki, Japan

Yasuhiro Suzuki