Patent ID: 8535473

Claim:
A method of making a thermosettable pressure sensitive adhesive tape, said method comprising: forming a first starting materials layer of photo-polymerizable first starting materials comprising a photo-polymerizable acrylic component, a thermosettable epoxy component and a black coloring pigment; forming a second starting materials layer of photo-polymerizable second starting materials comprising a photo-polymerizable acrylic component, and a thermosettable epoxy component; photo-polymerizing the first starting materials layer so as to produce a first adhesive layer having a first thickness and comprising a first thermosettable pressure sensitive adhesive, where the first adhesive is not black when cured without the black coloring pigment, and the first adhesive includes a sufficient amount of the black coloring pigment to cause the first adhesive to have a black color after the first adhesive is substantially cured; photo-polymerizing the second starting materials layer so as to produce a second adhesive layer having a second thickness and comprising a second thermosettable pressure sensitive adhesive, where the second adhesive is not black when cured without the second adhesive including enough of a black coloring pigment, and the second adhesive does not include an amount of a black coloring pigment that would cause said second adhesive to have a black color after said second adhesive is substantially cured; and bonding the first adhesive layer to a major surface of the second adhesive layer, wherein the first starting materials layer is thin enough to allow substantial photo-polymerization of the first starting materials even with the first starting materials containing the sufficient amount of black coloring pigment, and the second starting materials layer is thick enough that substantial photo-polymerization of the second starting materials would be prevented if the second starting materials contained enough of a black coloring pigment to cause the second adhesive to have a black color after the second adhesive is cured.