Carbonato de cálcio resistente e ácido processos para preparar o mesmo e para melhorar as propriedades óticas de papel neutro a fracamente ácido pela adição de uma composição de carbonato de cálcio

摘要

An improved form of calcium carbonate which is acid resistant to enable its use as a filler material in the making of neutral to weakly acid paper, and a process for producing this acid resistant calcium carbonate are provided. This acid resistant calcium carbonate consists of at least about 0.1 percent, based on the dry weight of the calcium carbonate, of a mixture of weak acids in admixture with the calcium carbonate.