Title:
NOVEL CALCIUM CARBONATE LOADING MATERIAL, PAPER CONTAINING THE LOADING MATERIAL, AND PROCESS FOR PRODUCING THE SAME
Document Type and Number:
WIPO Patent Application WO/2004/007837
Kind Code:
A1
Abstract:
A process for papermaking, characterized in that a calcium carbonate obtained by treating a calcium carbonate slurry with a low−concentration sulfuric acid is used as a loading material to form a paper by an ordinary method. The concentration of the sulfuric acid is such that the concentration of calcium sulfate yielded is lower than the solubility of calcium sulfate at the temperature used for the sulfuric acid treatment. When this calcium carbonate loading material treated with low−concentration sulfuric acid is used, texture is prevented from deteriorating although first−pass retention and loading material retention increase. Thus, a paper having a loading material content as high as at least 30 wt.% can be easily produced without any trouble.
Inventors:
HERIYANTO CHANDRA (ID)
LUNAWATI (ID)
TSAI MING TSUNG (ID)
LUNAWATI (ID)
TSAI MING TSUNG (ID)
Application Number:
PCT/JP2002/007127
Publication Date:
January 22, 2004
Filing Date:
July 12, 2002
Export Citation:
Assignee:
PT PABRIK KERTAS TJIWI KIMIA T (ID)
SUZUKI RIKIO (JP)
HERIYANTO CHANDRA (ID)
LUNAWATI (ID)
TSAI MING TSUNG (ID)
SUZUKI RIKIO (JP)
HERIYANTO CHANDRA (ID)
LUNAWATI (ID)
TSAI MING TSUNG (ID)
International Classes:
C09C1/02; D21H17/37; D21H17/44; D21H17/67; (IPC1-7): D21H17/67; D21H17/37; D21H17/44
Foreign References:
| JPS6418911A | 1989-01-23 | |||
| JPH11278831A | 1999-10-12 | |||
| JPH1060794A | 1998-03-03 |
Attorney, Agent or Firm:
Oda, Fujio (Wenping Kanda BLDG. 6-7, Kanda Kajicho 3-chom, Chiyoda-ku Tokyo, JP)
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