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Vibration damper composition

  • US 7,241,837 B2
  • Filed: 04/05/2001
  • Issued: 07/10/2007
  • Est. Priority Date: 04/05/2000
  • Status: Expired due to Fees
First Claim
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1. A damper material composition which comprises:

  • a block copolymer (A) comprising a polymer block (a) and polymer block (b) and terminating in said polymer block (b);

    wherein said polymer block (a) is comprised of an aromatic vinyl compound as a constituent monomer and said polymer block (b) is comprised of isobutylene as a constituent monomer; and

    wherein the ratio of the storage modulus (G′

    ) value at 0°

    C. to the corresponding value at 40°

    C. as found by the measurement of dynamic viscoelasticity at a frequency of 0.5 Hz and a shear strain of 0.05% in the shear mode, namely (G′



    C.
    /G′

    40°

    C.
    ), is not greater than 10, and the loss tangent (tan δ

    ) value as found by said measurement is not smaller than 0.4 at 0°

    C. to 40°

    C.; and

    wherein the aromatic vinyl compound is at least one selected from the group consisting of styrene, o-, m- or p-methylstyrene, β

    -methylstyrene, 2,6-dimethylstyrene, 2,4-dimethylstyrene, α

    -methyl-o-methylstyrene, α

    -methyl-m-methylstyrene, α

    -methyl-p-methylstyrene, β

    -methyl-o-methylstyrene, β

    -methyl-m-methylstyrene, β

    -methyl-p-methylstyrene, 2, 4, 6-trimethylstyrene, α

    -methyl-2, 6-dimethylstyrene, α

    -methyl-2, 4-dimethylstyrene, β

    -methyl-2, 6-dimethylstyrene, β

    -methyl-2, 4-dimethylstyrene, o-, m- or p-chlorostyrene, 2,6-dichlorostyrene, 2,4-dichlorostyrene, α

    -chloro-o-chlorostyrene, α

    -chloro-m-chlorostyrene, α

    -chloro-p-chlorostyrene, β

    -chloro-o-chlorostyrene, β

    -chloro-m-chlorostyrene, β

    -chloro-p-chlorostyrene, 2,4,6-trichlorostyrene, α

    -chloro-2, 6-dichlorostyrene, α

    -chloro-2, 4-dichlorostyrene, β

    -chloro-2,6-dichlorostyrene, β

    -chloro-2, 4-dichlorostyrene, o-, m- or p-t-butylstyrene, o-, m- or p-methoxystyrene, o-, m- or p-chloromethylstyrene, o-, m- or p-bromomethylstyrene, silyl-substituted styrene derivatives, indene and vinylnaphthalene.

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