Patent ID: 9125817
Filing Date: 2015-09-08
Classification: A61C,A61K,C08F

Abstract:
1. A method for forming a low color and color stable hardenable composition, said method comprising: providing a light-curable component comprising: an onium compound, a photosensitizer, an amine co-initiator having strong proton-donating capacity, and a resin monomer comprising a free radically active functional group and having no cationically active functional group, wherein said light-curable component is not miscible in water; providing a self-curable component comprising a reducing agent and an oxidizing agent, wherein the reducing agent is selected from the group consisting of a urea reducing agent and a thiourea reducing agent, exposing said light-curable component and said self-curable component to a source of electromagnetic radiation, and curing the light curable component and the self curable component to form a hardenable composition, wherein the hardenable composition is formed by free radical polymerization, and wherein the hardenable composition has an initial b* color value of less than 20 and a ΔE of less than 10, wherein ΔE represents the color change of the composition upon curing and is calculated using the equation ΔE=[(ΔL*)