Petroleum resin and pressure sensitive adhesive formulations utilizing same as tackifier

摘要

This invention relates to pressure sensitive adhesive formulations which include a block copolymer of styrene and isoprene such as Kraton TM D and a tackifying resin derived from petroleum feedstock polymerized in the presence of aluminum chloride and having a &upbar& Mw ranging from 800 to 960, a &upbar& Mn ranging from 500 to 600 with a &upbar& Mw/ &upbar& Mn ratio of from 1.3 to 1.9, a softening point of 78 DEG to 81 DEG C. and a glass transition temperature of about 50 DEG C. whereby the adhesive formulations have a rolling ball tack of less than 5 cm., a 180 DEG peel of higher than 3 pounds per inch, a 90 DEG quick stick of higher than 3 pounds per inch and a Polyken tack of higher than 1,000 g/cm2.