Paper making and fiber liberation – Processes and products – Non-fiber additive
Reexamination Certificate
2006-10-17
2006-10-17
Chin, Peter (Department: 1731)
Paper making and fiber liberation
Processes and products
Non-fiber additive
C162S147000, C162S179000
Reexamination Certificate
active
07122098
ABSTRACT:
The present invention provides a paper quality improver for papermaking, for improving bulk value, brightness, and opacity of the pulp sheet. Further, the present invention provides a dry efficiency improver. A compound is used as the paper quality improver for papermaking, wherein the compound has less than 4% of lyotropic degree measured by a specific method and the compound satisfies at least two selected from (i) standard improved bulky value of not less than 0.02 g/cm3, (ii) standard improved brightness of not less than 0.5 point and (iii) standard improved opacity of not less than 0.5 point. The compound is added internally into pulp slurry before or in papermaking step.
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Ikeda Yasushi
Nishimori Toshiyuki
Tadokoro Takaaki
Takahashi Hiromichi
Birch & Stewart Kolasch & Birch, LLP
Chin Peter
Kao Corporation
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