Patent ID: 8697821
Filing Date: 2014-04-15
Classification: C08F

Abstract:
1. A method of making an ethylene-propylene copolymer for use as a pressure sensitive adhesive, comprising the steps of: introducing a diimine nickel catalyst and toluene solvent into a reaction vessel, the catalyst having the structural formula: charging the reaction vessel with nitrogen gas to a pressure of 1.3 bar; placing the reaction vessel in an oil and equilibrating the temperature at 30° C.; removing the nitrogen gas from the reaction vessel; introducing a mixture of ethylene and propylene gases into the reaction vessel; adding polymethylaluminoxane (MAO) co-catalyst to the reaction vessel to initiate polymerization; quenching the polymerization after production of the ethylene-propylene copolymer; washing the copolymer; drying the copolymer in an oven at 50° C.