Bonding film

Claim 1

A COMPOSITE HANDLEABLE SHIPPABLE UNITARY FLEXIBLE ADHESIVE SHEET MATERIAL HAVING DISSIMILAR NON-STICKY OUTER SURFACE LAYERS ADAPTED FOR FORMING A PERMANENT HEAT-CURED BOND OF HIGH PEEL STRENTGH AND HIGH BEAM SHEAR STRENGTH OVER A WIDE RANGE OF TEMPERATURE BETWEEN ALUMINUM SKIN PANELS AND ALUMINUM HONEYCOMB STRUCTURES, SAID SHEET MATERIAL BEING NON-BONDING TO LOW ADHESION SURFACES OF AN INTERLINER SEPARATING OVERLAPPING CONVOLUTIONS OF THE SHEET MATERIAL IN ROLL FORM, AND COMPRISING (1) A ROOMTEMPERATURE-NON-STICKY, SOLID, HEAT-CURABLE, RUBBER-BASE ADHESIVE LAYER CHARACTERIZED BY BEING CURABLE AT ELEVATED TEMPERATURES TO A NON-BRITTLE THERMOSET CONDITION, AND (2) A ROOM-TEMPERATURE-SOLID AND -NON-STICKY, HEAT-FLUIDIZABLE, HEAT-CURABLE EPOXY RESIN ADHESIVE LAYER CHARACTERIZED BY BEING (A) FLOWABLE AS A VISCOUS LIQUID OF HIGH FILLETING ACTION AS IT IS ELEVATED IN TEMPERATURE, AND (B) SURABLE FROM SAID FLOWABLE STATE TO A SOLID THERMOSET STATE AT HIGHER ELEVATED TEMPERATURES WHICH SERVE ALSO TO CURE SAID RUBBER-BASE LAYER, SAID EPOXY RESIN ADHESIVE LAYER COMPRISING A ROOM-TEMPERATURE-SOLID EPOXY RESIN INITIALLY SOFTENING AT A TEMPERATURE BETWEEN ABOUT 100 AND 200*F., AND A HEAT-ACTIVATIBLE CURING AGENT FOR SAID SOLID EPOXY RESIN.