Charles V Singleton

US Patent:

56461925, Jul 8, 1997

Filed:

Oct 12, 1994

Appl. No.:

8/323461

Inventors:

John W. Dolan - Boothwyn PA
Charles E. Singleton - Wilmington DE

Assignee:

W. L. Gore & Associates, Inc. - Newark DE

International Classification:

C08J 916
C08J 922

US Classification:

521 56

Abstract:

In this invention a new form of polytetrafluoroethylene has been found to be compression moldable to provide exceptionally strong molded articles. It is also useful as an additive or strength binder. The new form is a compression molding powder comprised of comminuted, sheared particles of expanded porous polytetrafluoroethylene, said particles having a nudular-microfibrilar structure of irregular shape, and a mean particle size between 5 and 500 micrometers. By irregular shape is meant that the nodes and fibrils do not have an ordered arrangement. The bulk density is about 0. 06 to 0. 2 g/cc.