The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 07, 2019
Filed:
Dec. 02, 2008
Daniel E. Gerard, Basel, CH;
Patrick A. C. Gane, Rothrist, CH;
Joachim Schölkopf, Killwangen, CH;
Hans-joachim Weitzel, Suhr, CH;
Daniel E. Gerard, Basel, CH;
Patrick A. C. Gane, Rothrist, CH;
Joachim Schölkopf, Killwangen, CH;
Hans-Joachim Weitzel, Suhr, CH;
Omya International AG, Oftringen, CH;
Abstract
The present invention relates to a process for the preparation of a surface-reacted precipitated calcium carbonate (PCC) pigment having an insoluble, at least partially crystalline calcium salt on its surface. In the process of the present invention, a PCC containing pigment is contacted with HOions and a solubilized anion in an aqueous medium in the presence of excess solubilized calcium ions to form the surface-reacted PCC having an insoluble, at least partially crystalline calcium salt of the anion formed on its surface.