PROTEIN ADHESIVE BINDER AND PROCESS FOR FORMING A PROTEIN ADHESIVE BINDER

摘要

A protein adhesive is provided for use as an adhesive binder in a paper coating composition. The protein adhesive contains a protein material, a divalent dispersing agent, preferably an alkaline earth oxide or alkaline earth hydroxide, and a cation binding agent. The protein material is effective for use as an adhesive binder. The dispersing agent is combined with the protein material in an amount effective to adjust the pH of an aqueous solution of the protein material sufficiently to substantially solubilize the protein material. The cation binding agent is combined with the protein material and the dispersing agent in an amount effective to inhibit cation induced protein gel formation in an aqueous solution containing the protein adhesive. A process for forming a protein adhesive for a paper coating composition using a divalent dispersing agent, preferably an alkaline earth oxide or alkaline earth hydroxide, is also provided.