Process for producing porous products Patent #: 3953566
ApplicationNo. 05/637219 filed on 12/03/1975
US Classes:264/110, Mica particles264/122, Utilizing diverse solid particles264/127, Fluorocarbon resin264/210.6, With processing before extrusion or inclusion of additive264/211, Utilizing added agent (e.g., flux, plasticizer, dispersing agent, etc.)264/235.6, After stretching running or indefinite length work264/288.8, Nonuniform product (e.g., porous, etc.) or with tensioning before application of heat264/290.2Biaxial or transverse to travel direction
ExaminersPrimary: Woo, Jay H.
Attorney, Agent or Firm
AbstractThis invention provides a tetrafluoroethylene polymer in a porous form which has an amorphous content exceeding about 5% and which has a micro-structure characterized by nodes interconnected by fibrils. The material has high porosity and high strength. It can be used to produce all kinds of shaped articles such as films, tubes, rods, and continuous filaments. Laminations can be employed and impregnation and bonding can readily be used to produce a large variety of articles. Compressed articles of very high strength can also be produced from these porous forms.