US 11,787,879 B2
Production method of modified diene-based polymer
Takumi Kaneko, Kobe (JP); Kazuyoshi Shiga, Kobe (JP); and Shigeru Yamago, Kyoto (JP)
Assigned to SUMITOMO RUBBER INDUSTRIES, LTD., Kobe (JP); and SHIGERU YAMAGO, Kyoto (JP)
Filed by Sumitomo Rubber Industries, Ltd., Kobe (JP)
Filed on Apr. 1, 2022, as Appl. No. 17/711,208.
Claims priority of application No. 2021-063769 (JP), filed on Apr. 2, 2021.
Prior Publication US 2022/0325012 A1, Oct. 13, 2022
Int. Cl. C08F 8/34 (2006.01); C08F 10/08 (2006.01); C08F 2/48 (2006.01); C08F 136/06 (2006.01); C08C 19/00 (2006.01); C08C 19/20 (2006.01); C08L 9/00 (2006.01)
CPC C08F 8/34 (2013.01) [C08F 10/08 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for producing a modified diene-based polymer having a structure represented by the formula (1), comprising
a first step of mixing a diene-based polymer and a dithioester compound to prepare a mixture; and
a second step of irradiating a ray to the mixture under an inert atmosphere,

OG Complex Work Unit Chemistry
wherein in the formula (1), R1 and R2 represent an alkyl group having 1 or more carbon atoms, an aryl group having 6 or more carbon atoms, an aralkyl group having 6 or more carbon atoms, a hydrogen atom, or a halogen atom; and Z is an alkyl group, an alkenyl group, an alkynyl group, an aryl group, an aralkyl group, a heterocyclyl group, an alkoxy group, an aryloxy group, an aralkyloxy group, a heterocyclyloxy group, an alkanoyl group, an aroyl group, a heterocyclylcarbonyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a heterocyclyloxycarbonyl group, an alkanoyloxy group, an aroyloxy group, a heterocyclylcarbonyloxy group, a carbamoyl group, a carboxy group, an alkylthio group, an arylthio group, an amino group, a cyano group, a dialkylphosphonate group, a diarylphosphonate group, a dialkylphosphinate group, a diarylphosphinate group, an organic group wherein a portion of the hydrogen atoms of the above organic groups is substituted, a hydrogen atom, or a halogen atom, and
the dithioester compound is a compound represented by the formula (4), or a compound represented by the formula (5):

OG Complex Work Unit Chemistry
wherein in the formulae (4) and (5), Z is an alkyl group, an alkenyl group, an alkynyl group, an aryl group, an aralkyl group, a heterocyclyl group, an alkoxy group, an aryloxy group, an aralkyloxy group, a heterocyclyloxy group, an alkanoyl group, an aroyl group, a heterocyclylcarbonyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a heterocyclyloxycarbonyl group, an alkanoyloxy group, an aroyloxy group, a heterocyclylcarbonyloxy group, a carbamoyl group, a carboxy group, an alkylthio group, an arylthio group, an amino group, a cyano group, a dialkylphosphonate group, a diarylphosphonate group, a dialkylphosphinate group, a diarylphosphinate group, an organic group wherein a portion of the hydrogen atoms of the above organic groups is substituted, a hydrogen atom, or a halogen atom; and R7 represents a monovalent hydrocarbon group with an optional substituent group.