Resin use for tackification

Details Resin use for tackification Resin use for tackification

C - Chemistry, Metallurgy

08

F

C08F 240/00 (2006.01) C09J 153/00 (2006.01) C09J 153/02 (2006.01)

Patent

CA 2068658

The invention concerns formulations for hot melt pressure sensitive adhesives. The formulation includes an adhesive formulation for hot melt pressure sensitive adhesives including a styrene-butadiene block copolymer and a petroleum resin produced by copolymerising using a Friedel Craft catalyst, a mixture of (1) from 40 to 90 wt% of a feed comprising C5 olefins and/or diolefins, and/or C6 olefins and/or diolefins; (2) from 10 to 50 wt% of a feed comprising C8-C10 aromatic compounds the wt% being calculated on the basis of total weight of polymerisable feed components. The resin should possess (a) a level of aromaticity of from 13 to 45 wt% as determined by proton NMR, (b) a softening point of from 50 to 100 C,(c) and Mn of from 400 to 900 and an Mz of below 2200 and Mw below 1300 and a ratio of Mw/mn of from 1.2 to 1.7.

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