	US 12,291,590 B2
	Branched polymers
Steven Rannard, Merseyside (GB); Pierre Chambon, Liverpool (GB); and Savannah Cassin, Liverpool (GB)
Assigned to THE UNIVERSITY OF LIVERPOOL, Liverpool (GB)
Appl. No. 17/289,907
Filed by The University of Liverpool, Liverpool (GB)
PCT Filed Oct. 31, 2019, PCT No. PCT/GB2019/053106 § 371(c)(1), (2) Date Apr. 29, 2021, PCT Pub. No. WO2020/089649, PCT Pub. Date May 7, 2020.
Claims priority of application No. 1817837 (GB), filed on Oct. 31, 2018.
Prior Publication US 2022/0002460 A1, Jan. 6, 2022
Int. Cl. C08F 222/10 (2006.01); C08F 2/38 (2006.01); C08F 212/36 (2006.01); C08K 5/03 (2006.01); C08K 5/375 (2006.01); C08L 47/00 (2006.01)

CPC C08F 222/102 (2020.02) [C08F 2/38 (2013.01); C08F 212/36 (2013.01); C08K 5/03 (2013.01); C08K 5/375 (2013.01); C08L 47/00 (2013.01); C08L 2201/06 (2013.01)]

32 Claims

1. A method of preparing a degradable branched polymer comprising:

free radical polymerisation of one or more multivinyl monomers in the presence of one or more chain transfer agents and a source of radicals,

wherein the extent of propagation is controlled relative to the extent of chain transfer to prevent gelation of the polymer, and

wherein the multivinyl monomer comprises a cleavable group between two vinyl groups.