	US 12,258,456 B2
	Preparation method for spherical or angular powder filler, spherical or angular powder filler obtained thereby, and application thereof
Shuzhen Chen, Zhejiang (CN); Rui Li, Zhejiang (CN); Cheng Tang, Zhejiang (CN); Lieping Ding, Zhejiang (CN); and Chen Chen, Zhejiang (CN)
Assigned to Zhejiang Third Age Material Technology Co., LTD, Zhejiang (CN)
Appl. No. 17/432,548
Filed by Zhejiang Third Age Material Technology Co., LTD, Zhejiang (CN)
PCT Filed Dec. 5, 2019, PCT No. PCT/CN2019/123337 § 371(c)(1), (2) Date Aug. 20, 2021, PCT Pub. No. WO2020/168784, PCT Pub. Date Aug. 27, 2020.
Claims priority of application No. PCT/CN2019/075831 (WO), filed on Feb. 22, 2019; and application No. PCT/CN2019/109108 (WO), filed on Sep. 29, 2019.
Prior Publication US 2022/0153936 A1, May 19, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C08J 3/14 (2006.01); C08K 3/36 (2006.01)

CPC C08J 3/14 (2013.01) [C08K 3/36 (2013.01); C08J 2383/04 (2013.01)]

8 Claims

1. A preparation method for a spherical or angular powder filler, comprising the steps of:

S1, providing spherical or angular siloxane comprising a T unit, wherein the T unit=R1SiO3-, and R1 is a hydrogen atom or an organic group which can be independently selected from carbon atoms 1-18; and

S2, performing heat treatment on the spherical or angular siloxane under an inert gas atmosphere or atmospheric atmosphere, the heat treatment temperature being between 250 degrees and 650 degrees, so that silicon hydroxyl groups in the spherical or angular siloxane are condensed to obtain the spherical or angular powder filler, wherein in the unit T of the spherical or angular powder filler, the content of the unit without containing a hydroxyl group in the total unit is greater than or equal to 95%, and the content of the unit containing one hydroxyl group in the total unit is less than or equal to 5%.