Ube Industries, Inc.

Hiroshi Okushita

Tadao Muramatsu

Teruaki Fujii

Kouichirou Kurachi

Masato Shimokawa

Shoichi Tanaka

To provide a method for producing a polyoxamide resin by one-step polymerization without performing a pre-polycondensation step in a solvent, which is necessary in the conventional production of a polyoxamide resin. A method of mixing an oxalic acid diester and a diamine in a pressure-resistant vessel and subjecting the mixture to polymerization under pressure in the presence of an alcohol produced by a polycondensation reaction and then to melt polymerization at a temperature not lower than the melting point of the produced polymer preferably while extracting the alcohol, thereby producing a polyoxamide resin by one-step polymerization without using a solvent except for an alcohol that is produced by polycondensation of raw materials in the production process.

Production method of polyamide resin

Polyetherpolyamide elastomer showing a low water absorption, a high stress relaxation, and a high elastic recovery percentage of elongation is obtainable by polymerizing an aminocarboxylic acid compound and/or a lactam compound, a triblock polyetherdiamine compound having the following formula, and a dicarboxylic acid compound:[x is a value of 1 to 20, y is a value of 4 to 50, z is a value of 1 to 20].

Polyetherpolyamide elastomer having low water absorption

Polyamide elastomer comprising a hard segment derived from polyamide having no divalent aromatic group and a soft segment derived from polycarbonate diol having no divalent aromatic group has high flexibility and high heat resistance in addition to good physical characteristics of the known polyamide elastomers.

Polyamide elastomer

A polyamide with excellent stretching properties is disclosed, which comprises 50 to 99.8 mol % of a unit derived from a lactam and/or an aminocarboxylic acid, 0.1 to 25 mol % of a unit derived from a dicarboxylic acid, and 0.1 to 25 mol % of a unit derived from a diamine component containing 10 to 100 mol % of at least one compound selected from the group consisting of a branched saturated diamine having 6 to 22 carbon atoms, a branched alicyclic diamine having 6 to 16 carbon atoms, and a norbornanediamine.

Growing community of inventors

Yamaguchi, Japan

Hiroshi Okushita