Avery Dennison Corporation

Richard R Vargas

Sebastian S Plamthottam

Yehuda Ozari

Shiaonung J Su

John O Landers

Henry Lum, Jr

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.

Pressure-sensitive structural adhesive

A low viscosity hot melt acrylic pressure sensitive adhesive polymer is formed by bulk polymerization of at least one alkyl acrylate monomer containing from about 4 to 8 carbon atoms in the alkyl group and present in an amount of from about 60 to about 95% by weight of the polymer, from 1 to about 10% by weight of a copolymerizable amide monomer, from 1 to 10% by weight of a copolymerizble carboxylic acid, and a positive amount up to about 6% by weight of the monomers of a copolymerizable anhydride, said polymer formed thermally reversible crosslinks with a metal cation having a valence of from 2 to 4. Viscosity of the polymer is typically from 2 to 8 Pa.s at 150.degree. C. as formed and increases up to 100 Pa.s at 150.degree. C. on addition of the metal cation.

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Southgate, CA, United States of America

Richard R Vargas