Use of Dialdehyde Starch in Coating Color Formulation

A literature survey was conducted to determine what work, if any, had been done on dialdehyde starch as a coating adhesive. As a result of the survey, it was decided that experimental work would be started with the hope of overcoming some of the difficulties which confronted previous investigators and investigating further the use of dialdehyde starch as an adhesive. After experimental preparation and evaluation of the coated and aftertreated sheets, the following conclusions were formed: 1. The addition of ten percent borax buffered or bisulphite buffered dialdehyde starch to conventional oxidized starch increases the surface strength of the coating as well as the wet rub resistance. 2. Aftertreatment with the starch dispersions increases the surface strength of the coating and the wet rub resistance. 3. Bisulphite buffered dialdehyde starch is a better coating adhesive and waterproofer than borax buffered dialdehyde starch