公开(公告)号：US11015006B2

公开(公告)日：2021-05-25

申请号：US16093364

申请日：2017-04-05

Applicant: BASF SE

Inventor： Peter Leidinger ,  Piotr Antoni Bazula ,  Holger Misslitz ,  Gregor Herth ,  Stefan Friedrich ,  Maik Schlesinger

IPC: C08F220/48 ,  C04B20/10 ,  C09K8/588 ,  C08J3/12 ,  C09K8/487 ,  C09K8/467 ,  C08F220/56 ,  C04B24/16 ,  C09K8/508 ,  C09K8/516 ,  C04B111/20 ,  C04B103/00 ,  C08J7/06

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.

公开(公告)号：US10214676B2

公开(公告)日：2019-02-26

申请号：US15551086

申请日：2016-02-24

Applicant: BASF SE

Inventor： Peter Leidinger ,  Radoslaw Kierat ,  Bernhard Feichtenschlager ,  Kristina Brandt

IPC: E21B33/13 ,  C09K8/467 ,  C04B28/02 ,  C04B20/10 ,  C09K8/03 ,  C04B16/06 ,  C04B22/00 ,  C04B28/04 ,  E21B33/14

Abstract: The present invention relates to the use of modified fibers in oilfield applications, particularly in borehole cementing. Said fibers have crystallization seeds attached to their surfaces thereby improving the mechanical strength and ductility of borehole cements.