Coated polymer particles comprising a water-swellable polymer core and a sol-gel coating

US11015006B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Peter LEIDINGER · Ludwigshafen, DE
• Piotr Antoni Bazula · Mannheim, DE
• Holger MISSLITZ · Seeon, DE
• Gregor Herth · Trostberg, DE
• Stefan Friedrich · San Gabriel, US
• Maik SCHLESINGER · Ludwigshafen, DE

Key dates

• Filing date: Apr 5, 2017
• Grant date: May 25, 2021
• Expiry date: Jul 16, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2333/26
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to coated polymer particles comprising a water-swellable polymer core and an essentially continuous coating encapsulating the core. The coating comprises an oxide, hydroxide or oxide hydrate of silicon, aluminum, zirconium, tin or titanium. The polymer particles do not show instantaneous swelling, when contacted with water or a water-containing liquid, but show delayed water absorption after an appropriate period of time. The coated polymer particles may be used in oil fields, in mining, for construction chemical compositions or as carrier for active substances. The coated polymer particles are prepared by a suspension coating process or a fluidized bed coating process.