Hot-melt adhesives based on polyisobutylene - with addn of styrene-diene block copolymer and tackifying resin

摘要

Hot melt adhesives contg. (A) 50-80 parts mixt. of 80-98 parts of polyisobutylene (I) with mol. wt. (Stavdinger) of 10000-20000 and 20-2 parts polyisobutylene (II) of mol.wt. 100000-180000. (B) 10-35 parts thermoplastic rubbery block copolymer of styrene and a 1,3-diene, with Mn 80000-250000, and (C) 10 to 35 parts tackifying resin with softening pt. 60-120 degrees C. Also equipment for continuous prodn. and processing of such adhesives. Adhesive is used for coating of labels, insulating foils for building, corrosion-protective bandages, etc. The adhesives have good dimensional stability, and no uncontrolled breakdown of the rubber additive occurs during processing. They show esp. high cohesion, are suitable for continuous prodn., and avoid the pollution, explosion and other hazards of solvents-based adhesives.