Positively charged aqueous dispersions of polytetrafluoroethylene and method for preparing the same
Patent 3968069 Issued on July 6, 1976. Estimated Expiration Date: 
July 6, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 6, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2559752 2891921 3037953 3301807 InventorsAssigneeApplicationNo. 505066 filed on 09/11/1974US Classes:524/236, Trivalent or tetravalent nitrogen atom other than unsubstituted ammonium428/421, Of fluorinated addition polymer from unsaturated monomers524/546Four or more fluorine atomsExaminersPrimary: Anderson, Harold D.Attorney, Agent or FirmForeign Application Priority Data1971-02-19 FRAbstractThis invention relates to aqueous dispersions of positively charged polytetrafluoroethylene.This inventon also relates to a process for preparing aqueous dispersions of positively charged polytetrafluoroethylene which comprises adding an aqueous dispersion of negatively charged polytetrafluoroethylene containing an anionic emulsifier to an aqueous solution of a cationic emulsifier kept under light agitation while maintaining a ratio of the molar concentration of cationic emulsifier to that of the anionic emulsifier greater than 1:1. | |
