vesentligen oil-free, varmsmeltande tryckkenslig klisterkomposition comprehensive a elastomert (a - b - a - segmentpolymerisat, derived from styrene and isoprene, and a klibbgorande bestandsdel,essentially permanent.

摘要

1408277 Pressure-sensitive adhesives JOHNSON & JOHNSON 1 Nov 1972 [2 Nov 1971] 50391/72 Heading C3P A composition for use as a pressure-sensitive adhesive comprises an elastomeric ABA block copolymer where the A blocks are homo- or copolymers of styrene or its derivatives and the B block is an elastomeric homo- or co-polymer of isoprene optionally with other elastomers and 125-300 parts by weight per 100 of elastomeric component of a mixture of normally liquid and normally solid tackifier resins in the ratio of solid to liquid of 4 : 1 to 1 : 3. In examples a styrene/isoprene/styrene block copolymer is compounded with solid and liquid petroleum resins containing mainly piperylene and isoprene units or pentaerythritol rosin ester (solid) and diethyleneglycol hydrogenated rosin ester. The compositions also contain zinc dibutyl dithiocarbamate as heat stabilizer and 1,3,5-trimethyl - 2,4,6 - tris - (3,5 - ditertiarybutyl - 4- hydroxybenzyl) benzene as antioxidant.