Nippon Paper Industries Co., Ltd.

Masato Takayama

Yoshihiro Aoki

Takanori Otsuhata

Tomonori Kawamata

Ryo Sotooka

Takeo Izumiya

Hiroyuki Okumura

Shisei Goto

Yuki Takahashi

Seiki Yoneshige

Hiroyoshi Suzuki

Hirohiko Koizumi

Sakiko Nakada

Provided is a fibrillated chemically modified cellulose fiber, which has a type-I cellulose crystallinity of at least 50%, an anionic charge density of 0.10-2.00 meq/g, and an average fiber diameter of greater than 500 nm. Also, provided is a fibrillated chemically modified cellulose fiber, wherein the value (A/B) obtained by dividing the viscosity A measured at a shear rate of 0.01/sec by the viscosity B measured at a shear rate of 1000/sec in an aqueous dispersion having a solid content of 1 mass % is at least 100. These fibers have high water retention and high thixotropy.

Fibrillated chemically modified cellulose fiber

The present invention aims to develop a technique for efficiently preparing deinked pulp from prints made with UV-curable inks. According to the processes for preparing deinked pulp of the present invention, high quality deinked pulp can be obtained by performing the steps of: disintegrating printed waste paper containing UV prints in water to give a waste paper slurry; and applying a mechanical process to the waste paper slurry using a rotary disintegrator.

Methods for deinking UV prints

Provided is an oxidized microfibrillated cellulose fiber having a Canada standard freeness of less than 200 mL and an average fiber diameter of not less than 500 nm. Said fiber provides a composition having excellent water retention ability.

Oxidized microfibrillated cellulose fibers and composition thereof

Provided is an oxidized microfibrillated cellulose fiber having a Canada standard freeness of not less than 200 mL and an average fiber diameter of not less than 500 nm. Said fiber enhances paper strength when added to a paper.

Provided is a CM-modified microfibrillated cellulose fiber having a Canada standard freeness of not less than 200 mL and an average fiber diameter of not less than 500 nm. Said fiber enhances paper strength when added to a paper.

Carboxymethylated microfibrillated cellulose fibers and composition thereof

Provided is a carboxymethylated microfibrillated cellulose fiber having a Canada standard freeness of less than 200 mL and an average fiber diameter of not less than 500 nm. Said fiber provides a composition having excellent water retention ability.

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Tokyo, Japan

Masato Takayama