Extrusion process for difficultly-melt-processible polymers
US5064594A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1990 |
| Grant date | Nov 12, 1991 |
| Priority date | — |
| Expiry date | Sep 20, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L27/18
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Improved process for extruding through a die a difficultly-melt-processible polymer, especially a polymer containing an additive such as an antiblock agent. There is first extruded through the die a polymer resin containing 0.001 to 1 wt. % of a copolymer of tetrafluoroethylene and a functional-group-containing monomer that is terminated in a -CF.sub.2 W group wherein W is selected from -SO.sub.2 F, -SO.sub.2 Cl, -SO.sub.3 M, -COOR and -COOM, R is a C.sub.1-3 alkyl radical and M is H, a metal cation or an ammonium or quaternary ammonium cation, and thereafter there is extruded through the die the difficultly-melt-processible polymer admixed with 0.001-1 wt. % of a fluoropolymer process said having a fluorine to carbon ratio of at least 1:2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.