Mitsui Petrochemical Industries, Ltd.

Satoshi Omori

Kenji Wakatsuru

Hidetatsu Murakami

Yoshikatsu Amimoto

Masahiro Nozaki

Yoshimasa Ogo

Kunihiro Oouchi

Masaru Sudou

Ryuichi Hayashi

A process for producing an aromatic polyamide which comprises: (a) a dicarboxylic acid component which consists of 30-100 mol % of terephthalic acid and optionally 0-70 mol % of at least one dicarboxylic acid other than terephthalic acid, and (b) a diamine component which consists of 50-100 mol % of an aliphatic alkylenediamine of 4-25 carbons and optionally 0-50 mol % of at least one alicyclic diamine of 3-25 carbons, said process comprising a first step of performing melt reaction of said dicarboxylic acid with said diamine, thereby giving a low molecular weight condensate having an intrinsic viscosity [.eta.] of 0.05-0.6 dl/g, a second step of subjecting it to solid phase polymerization, thereby giving an aromatic polyamide precursor having an intrinsic viscosity [.eta.] of 0.5-1.0 dl/g, and a third step of subjecting it to melt polymerization, thereby giving an aromatic polyamide having a desired intrinsic viscosity [.eta.] of 0.8-2.5 dl/g. This process permits the industrial production of high molecular weight aromatic polyamides in an economical and efficient manner.

Production of aromatic polyamide

Semiaromatic polyamides, processes for preparing the same and

Growing community of inventors

Kuga-gun, Japan

Satoshi Omori