Patent ID: 7622176

Claim:
A hot-extrudable pressure-sensitive hot-melt adhesive, in the form of a granule, comprising a blend of: at least one styrene block copolymer formed from at least one styrene monomer and at least one other comonomer, said at least one styrene block copolymer comprising: a mass percentage of the styrene phase in the polymer of between 10 and 35%; and a mass percentage of diblocks in the polymer of greater than 30%; and at least one compatible tackifying resin, wherein said hot-extrudable pressure-sensitive hot-melt adhesive is in the form of a granule possessing: a viscosity, at a temperature of at least 130° C., lying within a range located above the power curve: η=22 000×( dγ/dt+ 200) −0.82 wherein dγ/dt comprises a shear rate between 100 and 1,000 s −1 ; a tensile strength at a pull rate of 1 ms −1 lying within the range located below the polynomial curve: y=− 2.82×10 −16 x 6 +5.92×10 −13 x 5 −4.97×10 −10 x 4 +2.15×10 −7 x 3 −4.99×10 −5 x 2 +6.26×10 −3 x+ 4.71×10 −2 , wherein y comprises an ordinate representing the stress expressed in MPa and x comprises an abscissa representing the deformation expressed in %; a weight content of copolymers of 45 to 85%; a weight content of resin of 15 to 55%; an elastic modulus G′<5×10 5 Pa at −20 to +40° C.; and an adjusted cold cohesion such that the hot-extrudable pressure sensitive adhesive is capable of exhibiting predominately cohesive failure during the first opening.