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:
Sep. 20, 1977
Filed:
Aug. 15, 1974
Japan Atomic Energy Research Institute, Tokyo, JA;
Abstract
A multi-step process of producing polyoxymethylenes by solid state polymerization of trioxane is disclosed. Trioxane is irradiated with ionizing radiation within a temperature range in which no polymerization of trioxane takes place. The irradiated trioxane is then polymerized by raising the temperature to a value at which polymerization of trioxane takes place, said temperature value being at least 15.degree. C above the first mentioned temperature. The polymerization is effected in the presence of an amount of alkyl acetal. The polymerized product thus obtained is then again irradiated, whereupon further polymerization of the irradiated product takes place. The resulting polyoxymethylenes are snow white and exhibit excellent thermal stability. They also have high molecular weights.