METHOD FOR THE PREPARATION OF ACID-TOLERANT CALCIUM CARBONATE FILLERS AND FILLED PAPER BASED ON HIGH-LIGNIN-CONTENT DEINKED PULP DERIVED FROM RECYCLED NEWSPAPER

摘要

The present invention relates to a method for the modification of calcium carbonate fillers to improve their acid-tolerant property and to make their effective use in papermaking of high-lignin-content deinked pulp derived from recycled newspaper. It has been found that modification of calcium carbonate fillers using the combination of a calcium salt with a weak acid can improve the acid-tolerant property of the fillers, and the optical properties of the filled paper, such as brightness, can also be effectively improved.