	US 11,718,691 B2
	Modified polyisobutylene polymer for rubber compounding and rubber composition comprising same
Se Hyun Lee, Daejeon (KR); Kyong Ju Na, Gwangju (KR); Min Sup Park, Daejeon (KR); and Myeong Seok Kim, Sejong-si (KR)
Assigned to DL Chemical CO., LTD., Seoul (KR)
Filed by DL Chemical CO., LTD., Seoul (KR)
Filed on Aug. 10, 2020, as Appl. No. 16/988,844.
Claims priority of application No. 10-2019-0102594 (KR), filed on Aug. 21, 2019; and application No. 10-2020-0081910 (KR), filed on Jul. 3, 2020.
Prior Publication US 2021/0054116 A1, Feb. 25, 2021
Int. Cl. C08L 9/06 (2006.01); C08L 9/00 (2006.01); C08F 8/42 (2006.01); C08F 8/46 (2006.01); C08F 136/08 (2006.01)

CPC C08F 136/08 (2013.01) [C08F 8/42 (2013.01); C08F 8/46 (2013.01); C08L 9/06 (2013.01); C08L 2205/025 (2013.01); C08L 2205/035 (2013.01)]

16 Claims

1. A rubber composition comprising:

a modified polyisobutylene polymer for rubber compounding; a rubber base; and a filler,

wherein the modified polyisobutylene polymer is prepared by

(i) mixing polyisobutylene having isobutylene as a main chain and a α-vinylidene content of 85 to 95 mol % based on ¹³C-NMR; and unsaturated dicarboxylic anhydride; and

(ii) mixing an intermediate obtained in step (i) and a silane compound;

wherein the modified polyisobutylene polymer has a number average molecular weight of 1,929 to 3,000 g/mol,

wherein the silica having a specific surface area (CTAB) of 150 m²/g to 180 m²g, and

wherein the rubber composition comprises, based on 100 parts by weight of the rubber base, 50 to 150 parts by weight of silica, 5 to 20 parts by weight of carbon black, 2 to 40 parts by weight of the modified polyisobutylene polymer, and 2 to 15 parts by weight of a silane-coupling agent.