Polytetrafluoroethylene molding resin and processes
US5658960A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 12, 1994 |
| Grant date | Aug 19, 1997 |
| Priority date | — |
| Expiry date | Oct 12, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/18
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In this invention a new form of polytetrafluoroethylene has been found to be compression moldable to provide 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 modular-microfibrillar structure of irregular shape, and a mean particle size between 5 and 500 micrometers, and having a coating of a thermoplastic fluoropolymer on at least a portion of the particle. 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.