US 11,242,427 B2 · Structural adhesive compositions

Abstract

An adhesive composition is disclosed. The adhesive composition comprises an epoxy-containing component; rubber particles having a core-shell structure; and a curing component comprising a mixture of an amine-containing compound substantially free of hydroxyl functional groups and a polymeric phenol-containing compound, wherein the amine-containing compound comprises primary and/or secondary amino groups, and wherein the curing component chemically reacts with the epoxy-containing component upon activation from an external energy source. Also disclosed are methods of preparing the adhesive composition and for forming a bonded substrate with the adhesive composition. Further disclosed are curing components for an adhesive composition and methods of making the curing components.

Claims37

Dependent claims

A curing component comprising a mixture of an amine-containing compound having a structure of formula (I):

wherein each R1 is independently H or a C1-C18 alkyl group;
R2 is oxygen;
each R3 is independently absent or C1-C4 divalent alkyl or divalent cycloaliphatic, wherein the amine-containing compound comprises primary and/or secondary amino groups and tertiary amines in an amount of less than 2% by weight based on total weight of the amine-containing compound and is substantially free of hydroxyl functional groups, and a polymeric phenol-containing compound;
wherein the curing component is ground to a D97 of no more than 500 μm using an air classifying mill;
and wherein the amine-containing compound is blocked by the polymeric phenol-containing compound in the absence of activation from an external energy source.

2 more elements

Dependencies are inferred from the claim text.

Structural adhesive compositions

Life of this patent

Structural adhesive compositions

Life of this patent

Abstract

Claims37