Nippon Paper Industries Co., Ltd.

Takanori Otsuhata

Yoshihiro Aoki

Masato Takayama

Ryo Sotooka

Tomonori Kawamata

Takeo Izumiya

Hiroyuki Okumura

Tadashi Yoshida

Kaoru Hamada

Tadakazu Fukuchi

Yoshihide Kimura

Kenji Hirai

Koji Kutsuwa

Junpei Natsui

Takashi Date

Akinobu Chatani

Satoshi Tsuda

Misaki Watanabe

Aya Katoh

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.

An inkjet recording medium, comprising an ink-receiving layer containing a pigment, a binder and an inkjet ink-fixing agent comprising a cationic compound disposed on at least one surface of a base paper, wherein 50% or more by weight of calcium carbonate is contained in terms of a solid content based on a total amount of the pigment contained in the ink-receiving layer; 75 to 90 parts by weight of the pigment, 1 to 10 parts by weight of the binder and 5 to 20 parts by weight of the inkjet ink-fixing agent are contained based on 100 parts by weight of the ink-receiving layer; the drop water absorbency of the ink-receiving layer (according to the drop water absorbency defined in Japan Technical Association of the Pulp and Paper Industry, J. TAPPI, No. 32-2:2000 except that a drop water amount is 0.001 ml) is 200 seconds or less; and a Stockigt sizing degree according to JIS-P-8122 for the inkjet recording medium is 5 seconds or less.

Inkjet recording medium

A thermally sensitive recording medium including on a support a thermally sensitive color development layer containing: a compound represented by the following general formula (1) as an organic color developing agent; and an oxalate compound represented by the following general formula (2) as a sensitizer. (In the formula (1): M represents CO or NRCO; when M is CO, mis 1; and when mis 0 and M is NRCO, B is not 0.)

Thermally sensitive recording medium

The present invention is the thermally sensitive recording medium comprising a thermally sensitive color developing layer containing colorless or pale colored basic leuco dye and a color developing agent as a main components on a substrate, wherein said thermally sensitive recording layer contains acrylic emulsion and colloidal silica, further contains at least one kind of diphenylsulfone bridgeable compound represented by general formula A as the color developing agent, wherein, X and Y can be different or same and indicates a saturated or an unsaturated liner or grafted hydrocarbon group of carbon number 1&#x2013;12 which can possess an ether bond, or indicate, wherein, R indicates a methylene group or an ethylene group, T indicates a hydrogen atom or an alkyl group of carbon number 1&#x2013;4, and R&#x2013;Rindependently indicate a halogen-atom, an alkyl group of carbon number 1&#x2013;6, or an alkenyl group, further, m, n, p, q, r, t indicate an integer number of 0&#x2013;4 and when are bigger than 2, R&#x2013;Rcan be different, and a is an integer of 0&#x2013;10.

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Tokyo, Japan

Takanori Otsuhata