| abstract |
A process for preparing polyacrylic hotmelt pressure sensitive adhesives, which comprises the following steps:(a) compoundingan 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 molecular mass MW of from 100,000 to 2,000,000 g/mol,with at least one chemical substance R-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) treating the compound in a reactor with a mixing apparatus at a specific drive energy of not more than 0.09 kWh/kg and at a temperature of from 80 to 200° C.,(c) transferring the self-adhesive composition thus treated to a downstream coating unit, and applying it from the melt to a backing material. |