| 摘要 |
<p>Hot-melt adhesive composition comprises (a) styrene block copolymer consisting of triblock copolymers and/or diblock copolymers, (b) tackifying resin consisting of resins obtained by (i) hydrogenation, polymerization or copolymerization (with or without aromatic hydrocarbon) from mixtures of 5-9C unsaturated aliphatic hydrocarbons and originating from petroleum cuts, (ii) polymerization of terpenic hydrocarbons in presence of Friedel-Crafts catalysts and (iii) polymerization of alpha methylstyrene units and optionally styrene, (c) a wax and (d) constituent consisting of e.g. polyolefins. Hot-melt adhesive composition comprises (a) 20-60 wt.% of a styrene block copolymer consisting of triblock copolymers of formula (A-B1-A) and/or diblock copolymers of formula (A-B1), (b) 5-55 wt.% of a tackifying resin having a number-average molecular weight of 200-10 kDa (determined by gel permeation chromatography with polystyrene standard) and consists of resins obtained by (i) hydrogenation, polymerization or copolymerization (with or without aromatic hydrocarbon) from mixtures of 5-9C unsaturated aliphatic hydrocarbons, and originating from petroleum cuts, (ii) polymerization of terpenic hydrocarbons in the presence of Friedel-Crafts catalysts and (iii) polymerization, followed optionally by partial hydrogenation, of alpha methylstyrene units and optionally styrene, (c) 10-40 wt.% of a wax having a melting point of 75-125[deg] C and a number-average molecular weight of 500-1500 Da (determined by gel permeation chromatography with polystyrene standard), and (d) 1-30 wt.% of a constituent consisting of polyethylene waxes and polyolefins polymerized by metallocene catalysis, where the composition has a Brookfield viscosity, at 180[deg] C, of 3000-70000 mPas, a softening point of 80-130[deg] C, preferably 90-120[deg] C and a modulus of elasticity, at 60[deg] C, of 2x 10 5> to 10 8> Pa, preferably 2x 10 5> to 10 7> Pa, as measured by rheological scanning test at a temperature of 150-10[deg] C at 10[deg] C/min and at a constant oscillation frequency of 10 rad/s. Independent claims are included for: (1) a ready-to-use hot-melt adhesive product comprising a hot-melt adhesive product constituted by a hot-melt adhesive material, and a coating of the hot-melt adhesive product, where the coating is constituted by the film; and (2) producing the ready-to-use hot-melt adhesive product, comprising co-extruding the film of composition around the hot-melt adhesive product. A : a non-elastomeric styrene block (or polystyrene); and B1 : a totally or partially hydrogenated polybutadiene elastomeric block.</p> |
