公开(公告)号：JPS63152708A

公开(公告)日：1988-06-25

申请号：JP9494187

申请日：1987-04-17

Applicant: BRIDGESTONE CORP

Inventor： MOROOKA TAKUYA

IPC: F16B37/14

公开(公告)号：JPS633054A

公开(公告)日：1988-01-08

申请号：JP14556886

申请日：1986-06-20

Applicant: SUMITOMO CHEMICAL CO ,  BRIDGESTONE CORP

Inventor： KATSUKI HIROSHI ,  YAMAMOTO MASASHI ,  MOROOKA TAKUYA

IPC: C08L23/02 ,  C08L23/18 ,  C08L23/22 ,  C08L53/00 ,  C08L53/02 ,  C08L91/00

Abstract: PURPOSE:The titled composition eliminating bleeding of oil in compression under pressure without damaging processing properties and physical properties, obtained by blending a block copolymer having a specific A-B-A structure with a polyolefin resin, a softener of mineral oil type, etc., in specific amounts. CONSTITUTION:100pts.wt. selectively hydrogenated block copolymer having A-B-A structure consisting of >=2 monoalkenyl or monoalkenylidene aromatic hydrocarbon polymers (e.g. polystyrene, etc.) A having 20,000-100,000 number- average molecular weight and >=1 intermediate block polymer B comprising a partially or completely hydrogenated aliphatic conjugated diene hydrocarbon polymer (e.g. polybutadiene, etc.) having 50,000-150,000 number-average molecular weight is blended with (B) 5-150pts.wt. polyolefin resin, (C) 4-140pts.wt. softener of mineral oil type and (D) 6-160pts.wt. high-molecular-weight polyisobutylene having 10,000-150,000 viscosity-average molecular weight in amounts to give 20-200pts.wt. components C and D and in a weight ratio of the component D/C+D=0.3-0.8.