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:
Feb. 18, 1997
Filed:
Sep. 21, 1995
Applicant:
Inventors:
Shinichi Namura, Shimizu, JP;
Takao Nishio, Shimizu, JP;
Assignee:
Du Pont - Mitsui Fluorochemicals, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29D / ; B29D / ; B65D / ; C08L / ;
U.S. Cl.
CPC ...
428 3692 ; 428 357 ; 428 369 ; 525200 ;
Abstract
A tetrafluoroethylene/fluoroalkoxy trifluoroethylene copolymer (PFA) composition which has finer spherulite diameters compared to a conventional PFA is provided, so as to give fabricated articles having excellent surface smoothness, and which are free from problems, such as process contamination and the like, caused by leaching. This effect is obtained by incorporating into the composition prior to fabrication a polytetrafluoroethylene having a crystallization temperature of at least 305.degree. C. and a heat of crystallization of at least 50 J/g.