Permanent paper
    1.
    发明授权
    Permanent paper 失效
    永久性文件

    公开(公告)号:US5562974A

    公开(公告)日:1996-10-08

    申请号:US87159

    申请日:1993-07-07

    摘要: A permanent paper is disclosed which employs as a stock pulp slurry containing at least one kind of filler and aluminum sulfate, a hydrophobic modified rosin emulsion sizing agent and a water-soluble alkaline salt, wherein the pH where said filler is dispersed in water to form 10% of a dispersion is 4-8, the pH of said pulp slurry is controlled within 6.5-7.5 and an alkaline salt of an acid having a pKa of 5-14 at a 25.degree. C. aqueous solution is coated onto said paper and the pH of the coated paper extract in cold water is 7.5-9.0.

    摘要翻译: 公开了一种永久性纸张,其使用含有至少一种填料和硫酸铝的浆料浆料,疏水性改性松香乳液上浆剂和水溶性碱性盐,其中所述填料分散在水中以形成 10%的分散体为4-8,所述纸浆的pH控制在6.5-7.5内,在25℃水溶液中将pKa为5-14的酸的碱性盐涂覆在所述纸上, 涂布纸提取物在冷水中的pH为7.5-9.0。