Back to results
US 4,397,980 AGranted
Process for preparing PTFE powdered resins containing pigments employing ammonium carbonate or ammonium bicarbonate
AssigneeE. I. Du Pont de Nemours and Company
InventorTheodore G. Tsakumis
Life of this patent
Estimating the term…
Abstract
Process for uniformly incorporating pigment into fine powder TFE polymers by premixing pigment and ammonium carbonate or bicarbonate, and then adding the mixture to a TFE polymer aqueous dispersion, followed by coagulating the pigment and TFE polymer.
Claims4
Process for preparing tetrafluoroethylene (TFE) polymer resins having pigment dispersed therein, which comprises
- a. mixing a pigment with ammonium carbonate or ammonium bicarbonate or both in a proportion of at least 40% by weight carbonate or bicarbonate,
- b. adding the mixture to an aqueous dispersion containing 10-30% by weight of a non-melt-processible TFE polymer,
- c. coagulating the TFE polymer and pigment,
- d. collecting the resulting pigmented TFE polymer that was coagulated in step (c).
1 more element
Dependencies are inferred from the claim text.