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:
May. 31, 1977
Filed:
Dec. 17, 1975
Masatoshi Iguchi, Yamato, JA;
Agency of Industrial Science & Technology, Tokyo, JA;
Abstract
Needle-like single-crystals of polyoxymethylene are obtained directly from a monomer, trioxane, in the course of polymerization in solution. The method for obtaining the crystals comprises preparing an anhydrous, dilute solution of trioxane in non-polar solvents, adding thereto a specified amount of boron trifluoride or its ether complex derivatives as catalyst and subsequently adding a small specified amount of water as co-catalyst, and maintaining the mixture unstirred at a fixed temperature. The needle-like crystals, measuring 5 to 100 microns long and 1 to 3 microns across, are single crystals having a hexagonal cross-section and constituted of molecular chains extended and aligned in the direction of length with full three dimensional regularity. This single-crystal is believed to be the first example of a `polymer whisker`.