Pressure sensitive adhesive
AssigneeNippon Zeon Co., Ltd.
InventorsAtsuo Ishikawa, Hidemi Tsubaki, Hitoshi Takahata, Riso Iwata, Yonesaku Shinohara
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Abstract
A pressure sensitive adhesive composition comprising (A) 100 parts by weight of a conjugated diene-type rubber, and (B) 30 to 250 parts by weight of a hydrocarbon resin having a softening point of 60.degree. C to 140.degree. C and comprising (a) 45 to 85% by weight of a unit derived from 1,3-pentadiene, (b) 10 to 45% by weight of a unit derived from .alpha.-methylstyrene, (c) 3 to 20% by weight of a unit derived from cyclopentene, (d) 0 to 20% by weight of a unit derived from 1,3-butadiene, and (e) 0 to 5% by weight of a unit derived from a copolymerizable monomer selected from isoprene, cyclopentadiene and dicyclopentadiene.
Claims10
A pressure sensitive adhesive composition comprising (A) 100 parts by weight of a conjugated diene rubber selected from the group consisting of natural rubber and synthetic rubber having a Mooney viscosity (ML.sub.1.sub.+4 /100.degree. C) of at least 30 and containing at least 50% by weight of a conjugated diolefin unit in the polymer chain, and (B) 30 to 250 parts by weight of a hydrocarbon resin having a softening point of 60.degree. C to 140.degree. C and consisting essentially of (a) 45 to 85% by weight of a unit derived from 1,3-pentadiene, (b) 10 to 45% by weight of a unit derived from .alpha.-methylstyrene, (c) 3 to 20% by weight of a unit derived from cyclopentene, (d) 0 to 20% by weight of a unit derived from 1,3-butadiene, and (e) 0 to 5% by weight of a unit derived from copolymerizable monomer selected from isoprene, cyclopentadiene and dicyclopentadiene.
A pressure sensitive adhesive composition comprising (A) 100 parts by weight of a conjugated diene rubber selected from the group consisting of natural rubber and synthetic rubber having a Mooney viscosity (ML.sub.1.sub.+4 /100.degree. C) of at least 30 and containing at least 50% by weight of a conjugated diolefin unit in the polymer chain, and (B) 50 to 200 parts by weight of a hydrocarbon resin having a softening point to 60.degree. C to 120.degree. C and consisting essentially of (a) 45 to 85% by weight of a unit derived from 1,3-pentadiene, (b) 10 to 45% by weight of a unit derived from .alpha.-methylstyrene, (c) 3 to 20% by weight of a unit derived from cyclopentene, and (d) 2 to 15% by weight of a unit derived from 1,3-butadiene.
Dependencies are inferred from the claim text.