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. 21, 1992
Filed:
Oct. 25, 1990
James L White, Akron, OH (US);
Tao Nie, Richmond, VA (US);
Edison Polymer Innovation Corp., Broadview Heights, OH (US);
Abstract
A method for preparing biaxially oriented poly(vinylidene fluoride) films involving the addition of a minor amount of a polymer miscible with PVDF, particularly poly(methyl methacrylate), to the poly(vinylidene fluoride) to form a blend exhibiting reduced crystallinity and reduced rates of crystallization during the film forming process. The low crystallinity permits the blend to be subsequently formed into biaxially oriented film in a double-bubble tubular film extrusion process by retarding the rate of crystallization in the first bubble, thereby permitting formation of the second bubble without rupture. The films thus formed possess piezoelectric and other desirable characteristics.