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? D and a tackifying resin derived from petroleum feedstock polymerized in the presence of aluminum chloride and having a ?w ranging from 800 to 960, a ?n ranging from 500 to 600 with a ?w/?n ratio of from 1.3 to 1.9, a softening point of 78 to 81.degree.C and a glass transition temperature of about 50.degree.C whereby the adhesive formulations have a rolling ball tack of less than 5 cm., a 180.degree. peel of higher than 3 pounds per inch, a 90.degree. quick stick of higher than 3 pounds per inch and a Polyken tack of higher than 1,000 g/cm2.