Improved hot melt adhesive.

摘要

A carton, case or tray is formed using a hot melt adhesive having specific gravity less than 0.98 and viscosity less than 8000 cps. at 175 deg.C comprising: (a) 20-50 wt. % ethylene-butyl acrylate copolymer(s) contg. 25-45 wt. % butyl acrylate and having melt index at least 10; (b) 30-60 wt. % tackifying resin from (hydrogenated) (cyclo)aliphatic and aromatic resins; (c) 10-30 wt. % synthetic wax m.pt. above 100 deg.C; and (d) 0-1.5 wt. % stabiliser. The ethylene-butyl acrylate copolymer(s) pref. contain 30-35 wt. % butyl acrylate, and pref. have melt index 100-8000. The tackifying resin pref. has ring ring and ball softening pt. 70-150 deg.C and is pref. a (hydrogenated) (cyclo)aliphatic petroleum resin. The wax is pref. from synthetic, high density low mol. wt. polyethylene waxes and Fischer-Tropsch waxes.