METHODS OF MAKING LOW SHRINKAGE AND EXPANDABLE COMPOSITIONS AND EXPANDABLE MONOMERS

摘要

The present invention pertain to a method of making a composition as well as low shrinkage and expandable compositions comprising an expandable monomer comprising at least two cyclic carbonate end groups; an epoxy resin; and a curing agent that concurrently reacts with the cyclic carbonate of the expandable monomer and epoxy groups of the epoxy resin. Also described are favored expandable monomers, comprising the reaction product of a cyclic carbonate compound having a hydroxyl group and a polyisocyanate comprising at least two hexamethylene groups and at least one uretdione, biuret, and/or isocyanurate group. The low shrinkage and expandable compositions and expandable monomers are suitable for various used such as (e.g. structural) adhesive wherein two substrates are bonded by the cured composition described herein.