US 12,404,352 B2
Encapsulated catalyst for one-part organopolysiloxane systems and methods related thereto
Jianhua Liu, Camarillo, CA (US); and James Michael Lambert, Glen Allen, VA (US)
Assigned to NUSIL TECHNOLOGY LLC, Carpinteria, CA (US)
Appl. No. 17/779,772
Filed by NUSIL TECHNOLOGY LLC, Carpinteria, CA (US)
PCT Filed Dec. 3, 2020, PCT No. PCT/US2020/063048
§ 371(c)(1), (2) Date May 25, 2022,
PCT Pub. No. WO2021/113470, PCT Pub. Date Jun. 10, 2021.
Claims priority of provisional application 62/944,394, filed on Dec. 6, 2019.
Prior Publication US 2023/0025643 A1, Jan. 26, 2023
Int. Cl. C08K 5/10 (2006.01); B01J 23/42 (2006.01); B01J 35/30 (2024.01); C08F 4/02 (2006.01); C08L 83/04 (2006.01)
CPC C08F 4/027 (2013.01) [B01J 23/42 (2013.01); B01J 35/398 (2024.01); C08K 5/10 (2013.01); C08L 83/04 (2013.01)] 20 Claims
 
1. A particle comprising:
a) a platinum-group catalyst; and
b) a molecular weight controlled thermoplastic polymer having a Tg or softening temperature of at least 20° C. selected from the group consisting of:
i. polystyrene or a co-polymer thereof having a Mw from about 500 g/mol to about 30,000 g/mol, and a polydispersity index (PDI) of less than 2;
ii. polymethylmethacrylate or a co-polymer thereof having a Mw from about 500 g/mol to about 30,000 g/mol, and a PDI of less than 2;
iii. polyacrylonitrile or a co-polymer thereof having a Mw from about 500 g/mol to about 30,000 g/mol, and a PDI of less than 2;
wherein the platinum-group catalyst is fully encapsulated within the thermoplastic polymer.