The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 20, 1981
Filed:
Nov. 01, 1979
Ikuo Sukegawa, Yokohama, JP;
Seiichi Nozawa, Yamato, JP;
Seiichi Mukai, Kawasaki, JP;
Masaharu Shikama, Kawasaki, JP;
Mitsubishi Chemical Industries, Limited, Tokyo, JP;
Abstract
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.