Patent ID: 7999038

Claim:
A weatherstrip composition comprising the following polymer A group and polymer B group, Polymer A group: A polymer group made up of a domain 1 consisting of crosslinked product of a polymer selected from a group consisting of ethylene polymer, ethylene/α-olefin copolymer (where the α-olefin has from 3 to 20 carbons), ethylene/α-olefin/diene copolymer (where the α-olefin has from 3 to 20 carbons), homopolymer rubber of a conjugated diene monomer, copolymer polymerized with a conjugated diene monomer and an aromatic vinyl monomer, and hydrogenated copolymer polymerized with a conjugated diene monomer and an aromatic vinyl monomer (where the hydrogenation of all double bonds except for the aromatic groups is at least 50%), and a domain 2 consisting of crosslinked product of a polymer having a number average molecular weight of from 500,000 to 7,000,000 selected from ethylene polymer and ethylene/α-olefin copolymer (where the α-olefin has from 3 to 20 carbons), wherein the storage elastic modulus E of domain 1 under conditions of a frequency of 200 Hz and a temperature of 23° C. is at least 3 GPa and less than 9 GPa, and the loss tangent tan δ is from 0.1 to 0.4, the storage elastic modulus E′ of domain 2 under the same conditions is at least 9 GPa and no more than 13 GPa, and the loss tangent tan δ is from 0.1 to 0.3, and the ratio of domain 1 and domain 2 in the polymer A group (domain 1 :domain 2 ) is from 50:50 to 95:5 (wt %) (the amount in which polymer A group is contained is from 40 to 100 wt % based on the total weight of the weatherstrip composition), Polymer B group: A polymer group made up of at least one thermoplastic resin selected from propylene polymer, ethylene/propylene copolymer, and ethylene/propylene/α-olefin terpolymer (where the α-olefin has from 3 to 20 carbons), wherein the storage elastic modulus E′ measured under the same conditions is from 5 to 17 GPa, and the loss tangent tan δ is greater than 0.4 and no more than 0.7 (the amount in which polymer B group is contained is from 0 to 40 wt % based on the total weight of the weatherstrip composition), wherein domain 2 exists in contact with domain 1 .