Process of manufacturing a curable precursor of a structural adhesive composition

A process of manufacturing a curable precursor of a structural adhesive composition, comprising the steps of:

• providing a mixing apparatus comprising a reaction chamber and an extrusion die;
• providing a curable precursor of a structural adhesive composition, comprising:
• a cationically self-polymerizable monomer, wherein the cationically self-polymerizable monomer is a polyfunctional compound comprising at least one cyclic amine;
• a polymerization initiator of the cationically self-polymerizable monomer which is initiated at a temperature T1;
• a curable monomer which is different from the cationically self-polymerizable monomer, wherein the curable monomer which is different from the cationically self-polymerizable monomer comprises at least one functional group selected from the group consisting of epoxy groups;
• and
• a curing initiator of the curable monomer which is initiated at a temperature T2 and which is different from the polymerization initiator of the cationically self-polymerizable monomer;
• incorporating and mixing the curable precursor of the structural adhesive composition in the reaction chamber of the mixing apparatus, thereby forming an extrudable composition;
• pressing the extrudable composition of step c) through the extrusion die, thereby forming an extrudate of the curable precursor of the (hybrid) structural adhesive composition;
• optionally, cooling down the extrudate of step d);
• and
• allowing the self-polymerization reaction of the cationically self-polymerizable monomers in the extrudate;
• and
• wherein the polymerization initiator of the cationically self-polymerizable monomer or the cationically self-polymerizable monomer is incorporated and mixed in the curable precursor of the structural adhesive composition immediately prior to the step of pressing the extrudable composition of step c) through the extrusion die.