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:
Oct. 19, 1976
Filed:
Nov. 18, 1974
Charles P Driscoll, Gillette, NJ (US);
Thaddeus E Helminiak, Dayton, OH (US);
Celanese Corporation, New York, NY (US);
The United States of America, Washington, DC (US);
Abstract
An improved process is provided for the precipitation of a polymer from a solution to form a particulate polymeric material exhibiting an unusually high surface area, i.e. having a surface area of at least 125 square meters per gram. A non-solvent for the polymer initially is added to the polymer solution until the solution is rendered turbid, a specified additional quantity of the non-solvent is added to the solution, and the resulting turbid solution is added to a major quantity of the non-solvent under conditions found capable of yielding the desired particulate polymeric material. High surface area particles of a BBB type polymeric material are formed in a preferred embodiment of the process. The resulting particles are rendered more readily compactable to form three-dimensional shaped articles, etc. because of their increased surface energy resulting from the large surface area.