Urea-based pressure-sensitive adhesives

摘要

Non-silicone urea-based adhesives are disclosed which are prepared by the polymerization of reactive oligomers with the general formula X—B—X, where X is an ethylenically unsaturated group and B is a unit free of silicone and containing urea groups. The reactive oligomers can be prepared from polyamines through chain extension reactions using diaryl carbonates followed by capping reactions. Adhesive articles, including optical adhesive articles may be prepared using the disclosed non-silicone urea-based adhesives.

主权项

1. An adhesive comprising a cured reaction mixture, the reaction mixture comprising:
at least one X—B—X reactive oligomer, wherein
X comprises an ethylenically unsaturated group,and B comprises a non-silicone segmented urea-based unit; and wherein the X—B—X reactive oligomer is the reaction product of a non-silicone segmented urea-based diamine and a Z—X material, wherein X comprises an ethylenically unsaturated group, and Z comprises an amine-reactive group, wherein the amine-reactive group Z reacts with an amine group of the non-silicone segmented urea-based diamine and wherein the non-silicone segmented urea-based diamine is the reaction product of a polyoxyalkylene diamine with a diaryl carbonate; and an initiator; and wherein the adhesive is a pressure sensitive adhesive or a heat activated adhesive.