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US 4,904,726 AGranted
Modified polytetrafluoroethylene resins and blends thereof
AssigneeE. I. DuPont DeNemours and Company
InventorsRichard A. Morgan, Charles W. Stewart
Life of this patent
Estimating the term…
Abstract
Dispersion-process-produced, non-melt-processible, particulate, core-shell, tetrafluoroethylene copolymer comprising recurring units of tetrafluoroethylene and modifying recurring units of at least one ethylenically unsaturated comonomer that is copolymerizable with the tetrafluoroethylene, the number of recurring units of comonomer in the shell being sufficient to enable the copolymer to compound uniformly with an elastomer or plastic without forming visible agglomerates, and blends thereof with elastomeric and plastic resins.
Claims17
Blend of
- (a) an elastomeric resin, and
- (b) 0.1 to 200 parts per 100 parts of component (a) of a dispersion-process-produced, non-melt-processible, particulate, core-shell, tetrafluoroethylene copolymer, the copolymer being present in said resin in the form of platelets distributed throughout the resin and comprising recurring units of tetrafluoroethylene and modifying recurring units of a comonomer selected from the class consisting of hexafluoropropylene, perfluoro(alkyl vinyl ethers), perfluoro(alkyl vinyl ethers) wherein an alkyl group is replaced with a hexafluoropropylene oxide oligomer, chlorotrifluoroethylene, and a mixture thereof, the number of recurring units of comonomer in the shell being sufficient to enable the copolymer to compound uniformly with said resin without forming visible agglomerates.
Dependencies are inferred from the claim text.