METHOD OF INCREASING WHITE COLOR OF PAPER PAINT AND WHITE INCREASING AGENT PRODUCT FOR USE IN THE SAME

摘要

PURPOSE: To manifest sufficient optical brightening effect while retaining light- fast property by adding a optical brighter agent product consisting of an optical brighter agent and specific cellulose powder and a pigment to a paper coating material. CONSTITUTION: A paper coating material is effectively brightened with a mixture prepared by adding to (A) an optical brighter product consisting of an optical brighter and water dispersible cellulose powder, or comprising cellulose powder coated with a an optical brighter (B) a pigment for a coating material. The cellulose powder has 50 m average particle diameter.