Patent ID: 6753079
Filing Date: 2004-06-22
Classification: C08G,C09J,Y10T

Abstract:
A process for preparing polyacrylic hotmelt pressure sensitive adhesives having functional groups R, which comprises the following steps:(a) compounding an acrylic hotmelt pressure sensitive adhesive containing at least one functional group X, having a solvent content of not more than 0.5% by weight and a weight average molecular weight MW of from 100,000 to 2,000,000 g/mol, with at least one chemical substance Râ€”Y containing at least one functional group Y, said at least one functional group X and said at least one functional group Y being chosen such that they are capable of undergoing a coupling reaction with one another, (b) reacting the compounded product at a temperature of from 80 to 200Â° C. in a reactor with a mixing apparatus operating at a specific drive energy of not more than 0.09 kWh/kg and, (c) transferring the reaction product to a coating unit, and applying it as a melt to a backing material.