Pressure-sensitive structural adhesive
AssigneeAvery Dennison Corporation
InventorsRichard R. Vargas, Sebastian S. Plamthottam, John O. Landers
Life of this patent
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Abstract
A pressure-sensitive structural adhesive is formed by applying a thin layer of pressure-sensitive adhesive to one or both sides of a core layer of partially cured structural adhesive. The pressure-sensitive adhesive provides a tacky surface allowing a temporary bond at room temperature. Upon curing of the construction, the bond properties change to that of a structural adhesive, providing a strong permanent bond. Upon cure, the skin layer or layers of pressure-sensitive adhesive are absorbed into the layer of structural adhesive.
Claims15
A pressure-sensitive structural adhesive construction comprising:
- (a) a core layer of a curable structural adhesive which is a partially cured B-stage epoxy resin or a blend of an epoxy resin, an acrylic ester resin and a hardener, said core layer having opposed surfaces and having applied on at least one of said opposed surface prior to cure of the core layer;
- (b) a continuous or discontinuous layer of an inherently tacky pressure-sensitive adhesive, compositionally different from the core;
- said pressure-sensitive adhesive layer providing an initial adhesion to a substrate to be bonded by cure of the core layer and being absorbed by the core layer when a permanent thermoset bond to such substrate is formed by thermal cure of the core layer.
Dependencies are inferred from the claim text.