Mitsubishi Chemical Industries Limited

Masaharu Shikama

Seiichi Mukai

Seiichi Nozawa

Hideki Yamanouchi

Tamotsu Yoshimura

Masahiro Hayashi

Harutaka Kimura

Hideto Kusumoto

Ikuo Sukegawa

A thermoplastic resin composition is quickly crystallizable and comprises 0.1 to 10 wt. parts of an alkali metal salt of higher fatty acid having carbon atoms of at least 26 obtained by an addition of a fatty acid to .alpha.-olefin having carbon atoms of at least 23 per 100 wt. parts of a thermoplastic polyester.

Thermoplastic polyester resin composition which is quickly crystallizable

Polyoxymethylene having high molecular weight and high thermal stability is produced by polymerizing formaldehyde in the presence of a specific catalyst and then heating the resulting polyoxymethylene. The specific catalyst is produced by contacting a phosphorus containing compound or an amine (c) with a reaction product obtained by reacting salicylic acid component (b) with an organoaluminum compound (a) having the formula ##STR1## wherein R.sup.1 represents an alkyl or alkoxyl group and R.sup.2 and R.sup.3 respectively represent alkyl or alkoxyl group or a halogen atom.

Process for producing polyoxymethylene

Polyoxymethylene is produced by polymerizing formaldehyde in the presence of a catalyst comprising a catalytic component of an organoaluminum compound or a complex thereof supported on a modifier of a higher carboxylic acid amide compound. The organoaluminum compound can be in a form of a complex of the organoaluminum compound and a phosphorus compound or an amine.

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Kawasaki, Japan

Masaharu Shikama