Patent ID: 7517932
Filing Date: 2009-04-14
Classification: C08F,C08L,C09J,Y10T

Abstract:
1. A hot melt adhesive composition comprising: a) a poly(styrene-butadiene-styrene) polymer having a high vinyl content in the butadiene block, said polymer having: i) a polystyrene content of from 15% to 20% by weight; ii) a coupling efficiency of from 50% to 80%; iii) a styrene block molecular weight of each styrene block of from 9,000 to 9,600 g/mol; iv) a vinyl content in the butadiene block of from 20 to 40%; and v) a melt flow rate of equal to or greater than 10 g/10 min (200° C., 5 kg), b) a tackifying resin; c) a plasticizer in the amount of 5 to 75 parts by weight; and d) an anti-oxidant.