US 12,030,965 B2
Modified conjugated diene based polymer, manufacturing method thereof, binder composition for solid propellant comprising the same, modified conjugated diene based binder for solid propellant, and manufacturing method thereof
Byoung Sun Min, Daejeon (KR); Jin Hyuk Lee, Daejeon (KR); Hong Min Shim, Daejeon (KR); Sungjune Kim, Daejeon (KR); and Minhye Lee, Daejeon (KR)
Assigned to AGENCY FOR DEFENSE DEVELOPMENT, Daejeon (KR)
Filed by AGENCY FOR DEFENSE DEVELOPMENT, Daejeon (KR)
Filed on Jun. 24, 2022, as Appl. No. 17/849,485.
Claims priority of application No. 10-2022-0024932 (KR), filed on Feb. 25, 2022.
Prior Publication US 2023/0272131 A1, Aug. 31, 2023
Int. Cl. C08F 136/14 (2006.01)
CPC C08F 136/14 (2013.01) 11 Claims
 
1. A modified conjugated diene based polymer comprising:
a conjugated diene based monomer-derived repeating unit; and
a chain extender-derived part which is linked to both terminals of the conjugated diene based monomer-derived repeating unit, respectively, includes one or more urethane groups in a molecular chain, and has different functional groups at both terminals, wherein one of the functional groups is an alkyne group,
wherein a terminal of the chain extender-derived part which is not linked to both terminals of the conjugated diene based monomer-derived repeating unit is an alkyne group,
wherein the chain extender-derived part is formed from a chain extender having an alkyne group at one terminal and an isocyanate group at the other terminal, and
bonded to the isocyanate group of the chain extender by reacting with hydroxyl groups at both terminals of the conjugated diene based monomer-derived repeating unit.