发明名称 |
LOW-DENSITY NEUTRAL PAPER |
摘要 |
The present invention provides a low-density neutral paper offering excellent opacity, opacity after printing and other advantageous printability properties despite high bulk, by containing, as a filler, precipitated calcium carbonate-silica composite having an average particle size of 30 µm or less and produced by neutralizing a mixture of precipitated calcium carbonate and alkaline silicate to pH 7 to 9, wherein the ratio of precipitated calcium carbonate to silica (precipitated calcium carbonate/silica) is 30/70 to 70/30 in solid content by weight and the surface of precipitated calcium carbonate particles is covered with silica. In particular, the present invention provides a low-density printing paper, or an electrophotographic transfer paper offering excellent stiffness and copier suitability, by means of adjusting the filler content in paper to a range of 1 to 25 solid content percent by weight, or provides a neutral newsprinting paper by means of adjusting the filler content in paper to a range of 0.1 to 25 solid content percent by weight. |
申请公布号 |
EP1736598(A4) |
申请公布日期 |
2010.03.24 |
申请号 |
EP20050720829 |
申请日期 |
2005.03.15 |
申请人 |
NIPPON PAPER INDUSTRIES CO., LTD. |
发明人 |
SOGA, KAZUNARI;NAGAHARA, DAI;FUJITA, KAZUYUKI;OCHI, TAKASHI;KUTSUWA, KOJI;ONO, KATSUMASA |
分类号 |
D21H17/68;C01F11/18;C09C1/02;D21H17/67;D21H19/38;D21H19/40;D21H21/52 |
主分类号 |
D21H17/68 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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