Heat-setting single-component LVA (low viscosity adhesive) system for bonding in the micro-range

A single-component adhesive system thermally hardenable by a cationic mechanism comprising:

• 60 to 98 weight percent of an epoxy casting resin;
• 2 to 30 weight percent of a multivalent alcohol, said multivalent alcohol being 3(4),8(9)-bis(hydroxymethyl) tricyclo [5.2.1.02,6] decane;
• 0.2 to 2.0 weight percent of a thermal initiator;
• 0.2 to 2.0 weight percent of a bonding agent;
• 0 to 3.0 weight percent of a flow improver;
• 0 to 4.0 weight percent of a thixotropic agent;
• 0 to 4.0 weight percent of a flow modifier other than the thixotropic agent;
• and
• 0.2 to 5.0 weight percent of a Zn+2 complex, the Zn +2 complex being di-(2-ethylhexanoate)zinc.

A method for forming precision glued bonds with dimensional tolerances in the micrometer and sub-micrometer region, the method comprising the steps of:

• providing a thermally hardenable single-component adhesive system comprising:
• 60 to 98 weight percent of an epoxy casting resin;
• 2 to 30 weight percent of a multivalent alcohol, the multivalent alcohol being 3(4), 8(9)-bis (hydroxymethyl) tricyclo [5.2.1.026] decane;
• 0.2 to 2.0 weight percent of a thermal initiator;
• 0.2 to 2.0 weight percent of a bonding agent;
• and
• 0.2 to 5.0 weight percent of a Zn+2 complex compound;
• dosing the adhesive system onto components to be connected;
• and
• thermally hardening the adhesive system.