Block copolymers and composition containing the same
AssigneeKuraray Co., Ltd.
InventorsMiduho Maeda, Hideo Takamatsu, Masao Ishii, Shobu Minatono
Life of this patent
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Abstract
A block copolymer having a numerical average molecular weight of 30,000 to 300,000 composed of two or more blocks consisting of aromatic vinyl units having a numerical average molecular weight of 2500 to 40,000, and one or more blocks containing a vinyl bonding content of not less than 40%, having a peak temperature of primary dispersion of tan .delta. at least 0.degree. C., and consisting of isoprene or isoprene-butadiene units in which at least a part of carbon-carbon double bonds may be hydrogenated, and a composition consisting of the block copolymer. The composition can provide a vibration-damping material.
Claims9
A block copolymer having a number average molecular weight of 30,000 to 300,000 composed of at least two blocks consisting of aromatic vinyl units each having a number average molecular weight of 2,500 to 40,000 and at least one block containing a vinyl bond content of not less than 40%, having a peak temperature of primary dispersion of tan .delta. of at least 0.degree. C., and consisting of isoprene or isoprene-butadiene units in which at least a portion of the carbon-carbon double bonds may be hydrogenated.
A composition consisting of 100 parts by weight of a block copolymer having a number average molecular weight of 30,000 to 300,000 composed of at least two blocks consisting of aromatic vinyl units each having a number average molecular weight of 2,500 to 40,000 and at least one block containing a vinyl bond content of not less than 40%, having a peak temperature of primary dispersion of tan .delta. of at least 0.degree. C., and consisting of isoprene or isoprene-butadiene units in which at least a portion of the carbon-carbon double bonds may be hydrogenated, and 5 to 250 parts by weight of a tackifier having a softening temperature of at least 30.degree. C.
A vibration-damping material which comprises a block copolymer having a number average molecular weight of 30,000 to 300,000 composed of at least two blocks consisting of aromatic vinyl units each having a number average molecular weight of 2,500 to 40,000, and at least one block containing a vinyl bond content of not less than 40%, having a peak temperature of primary dispersion of tan .delta. of at least 0.degree. C., and consisting of isoprene or isoprene-butadiene units in which at least a portion of the carbon-carbon double bonds may be hydrogenated.
A support having a layer of a material which comprises a block copolymer having a number average molecular weight of 30,000 to 300,000 composed of at least two blocks consisting of aromatic vinyl units each having a number average molecular weight of 2,500 to 40,000, and at least one block containing a vinyl bond content of not less than 40%, having a peak temperature of primary dispersion of tan .delta. of at least 0.degree. C., and consisting of isoprene or isoprene-butadiene units in which at least a portion of the carbon-carbon double bonds may be hydrogenated.
A sandwich structure which comprises two support plates and sandwiched therebetween a material which comprises a block copolymer having a number average molecular weight of 30,000 to 300,000 composed of at least two blocks consisting of aromatic vinyl units each of which has a number average molecular weight of 2,500 to 40,000 and at least one block containing a vinyl bond content of not less than 40%, having a peak temperature of primary dispersion of tan .delta. of at least 0.degree. C., and consisting of isoprene or isoprene-butadiene units in which at least a portion of the carbon-carbon double bonds may be hydrogenated.
Dependencies are inferred from the claim text.