This invention relates to bleached mechanical paper pulps, based on
fibrillated fibers of cellulose, hemicelluloses and lignin, containing
calcium carbonate, in which calcium carbonate is crystallized and at
least partly covers the fibrillated fibers of cellulose, hemicelluloses
and lignin to which the calcium carbonate is mechanically bonded, papers
made from these pulps and their preparation process.