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:
Mar. 29, 1994
Filed:
Dec. 04, 1992
George C Na, Fort Washington, PA (US);
Natarajan Rajagopalan, Phoenixville, PA (US);
Sterling Winthrop Inc., New York, NY (US);
Abstract
This invention discloses a composition comprised of nanoparticles having a surface modifier adsorbed on the surface thereof and an anionic or cationic surfactant as a cloud point modifier associated therewith, which cloud point modifier is present in an amount sufficient to increase the cloud point of the surface modifier. A preferred surface modifier is tyloxapol. Preferred anionic surfactants are dioctylsulfonesuccinate, sodium dodecyl sulfate and sodium oleate. Preferred cationic surfactants are dodecyltrimethylammonium bromide and cetrimide tetradecyl ammonium bromide. This invention further discloses a method of making nanoparticles having a surface modifier adsorbed on the surface and an anionic or cationic surfactant as a cloud point modifier associated therewith, comprised of contacting said nanoparticles with the cloud point modifier for a time and under conditions sufficient to increase the cloud point of the surface modifier.