3m Innovative Properties Company

Rachel J Squires

Lianzhou Chen

Jay S Schlechte

George M Stout

George S Stout

A two-part adhesive is provided comprising: A) a curative part comprising: i) an epoxy curative; and ii) a reaction intermediate which is the reaction product of a suspension of core/shell rubber nanoparticles in a liquid epoxy resin and an excess of the epoxy curative; wherein the curative part comprises greater than 1.1 wt % core/shell rubber nanoparticles; and B) an epoxy part comprising: iii) a liquid epoxy resin; and iv) greater than 9.1 wt % core/shell rubber nanoparticles. In some embodiments, the epoxy part additionally comprises greater than 5.1 wt % solid epoxy resin, such as, e.g., triglycidyl ether of trisphenol-methane. In some embodiments, the sum of the wt % solid epoxy resin and the wt % core/shell rubber nanoparticles in the epoxy part is greater than 41.0%. In some embodiments, the sum of the wt % solid epoxy resin and the wt % core/shell rubber nanoparticles in the mixed adhesive is greater than 26.0%.

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Stillwater, MN, United States of America

Rachel J Squires