Patent ID: 8703263

Claim:
A pressure sensitive hot melt adhesive composition comprising: from 20% to 50% by weight of a polymeric portion A comprising a mixture of block copolymers of: i) 10 to 100% by weight of one or more radial or linear triblock copolymers of the Styrene-Butadiene-Styrene (SBS), Styrene-Isoprene-Styrene (SIS), Styrene-Ethylene-Butadiene-Styrene (SEBS), Styrene-Isoprene/Butylene-Styrene (SIBS), Styrene-Ethylene/Propylene-Styrene (SEPS) type, and ii) less than 90% by weight of one or more diblock copolymers of the Styrene-Butadiene (SB) or Styrene-Isoprene (SI) or Styrene-Ethylene/Butylene (SEB) or Styrene-Isoprene/Butylene (SIB) or Styrene-Ethylene/Propylene (SEP) type, the overall content of styrene units of said mixture being less than or equal to 35% by mass; from 50 to 80% by weight of a resin portion including a liquid portion B and a solid portion C; wherein the liquid portion B) accounts for 25 to 100% by weight of the B+C mixture and has a minimum softening point measured according to the ASTM E 28 standard or the DSC method, in the range of −10° C. to 50° C., said liquid portion comprising B1, wherein B1comprises one or more tackifying resins selected from liquid polar compounds based on rosins or ester derivatives of rosins, optionally in a mixture with B2, wherein B2 comprises at least one benzoate oil, optionally comprising one or more hydrocarbon apolar oils of the naphthene or paraffin type; the solid portion C accounts for up to 75% by weight of the B+C mixture and has a softening point measured according to the ASTM E 28 standard, above 70° C., and includes one or more apolar solid tackifying resins or terpene resins; said B+C portion comprising from 0 to 40% by weight of apolar resin, and from 60% to 100% by weight of polar resin.