公开(公告)号：US20220227944A1

公开(公告)日：2022-07-21

申请号：US17608518

申请日：2019-05-06

申请人： WACKER CHEMIE AG

发明人： Shuai Tian ,  Huifeng Duan ,  Heng Yang

IPC分类号： C08G77/16 ,  C08G77/10 ,  C08G77/08 ,  C08G77/18 ,  C08G77/20 ,  C08G77/38

摘要： The present disclosure relates to a method for preparing polyorganosiloxanes, comprising the following steps: a) reacting together a hydroxyl-terminated polysiloxane and a dialkoxysilane or an oligomer thereof in the presence of Catalyst 1, and b) reacting the product of Step a) with an endcapper in the presence of Catalyst 2 to form the polyorganosiloxane. According to this method, poly-organosiloxanes with an appropriate degree of the polymerization and viscosity are prepared by the polycondensation and equilibration reactions sequentially, and can significantly reduce the viscosity, and improve the flowability and thermal conductivity of the resulting silicone compositions, compared with other polysiloxanes at the same high thermally conductive filler loading.

公开(公告)号：US11746193B2

公开(公告)日：2023-09-05

申请号：US17292168

申请日：2018-11-20

申请人： WACKER CHEMIE AG

发明人： Heng Yang ,  Shuai Tian ,  Zhongliang Sun

IPC分类号： C08G77/452 ,  C08G77/46 ,  C08L83/08 ,  D06M15/643 ,  C08G77/44 ,  C08L83/12 ,  D06M101/32 ,  C08G77/26

CPC分类号： C08G77/452 ,  C08G77/44 ,  C08G77/46 ,  C08L83/08 ,  C08L83/12 ,  D06M15/6436 ,  C08G77/26 ,  D06M2101/32 ,  D06M2200/50

摘要： Block-modified polysiloxanes and compositions comprising the block-modified polysiloxanes are useful in the field of textile finishing. Emulsions comprising the compositions have a very small and narrowly distributed particle size which increases penetration, and provide good softening properties coupled with good hydrophilicity.

公开(公告)号：US20220220259A1

公开(公告)日：2022-07-14

申请号：US17608476

申请日：2019-05-06

申请人： WACKER CHEMIE AG

发明人： Huifeng Duan ,  Shuai Tian ,  Kai Xu ,  Heng Yang

IPC分类号： C08G77/08 ,  C08G77/12 ,  C08G77/20 ,  C08K3/22 ,  C09K5/14

摘要： The present disclosure relates to a polyorganosiloxane comprising the following structural formula: X—[Si(R1)2O]—[Si(R2)2O]m—[SiR2CaH2a+1O]n—[Si(R1)2]—X, where a is an arbitrary integer between 6 and 18, n is an arbitrary number between 0.7 and 20, m is an arbitrary number between 10 and 1500, m/n is an arbitrary number greater than 20, R1 or R2 is a C1-C5 alkyl group, X represents one or more groups selected from among C2-C6 alkenyl, alkoxy, hydroxyl and hydrogen. The polyorganosiloxane can significantly lower the viscosity, and improve the flowability and processability, of the resulting silicone composition, compared with other polyorganosiloxanes at the same thermally conductive filler loading. Meanwhile, for thermally conductive silicone compositions with the same viscosity, the polyorganosiloxane used as the base polymer can accept a significantly higher level of the thermally conductive fillers, thereby improving their thermal conductivity.