Patent Issued for
The patent's inventors are Umemoto, Tomokazu (Kanagawa, JP); Akai, Hideko (Kanagawa, JP); Noishiki, Yasutomo (
This patent was filed on
From the background information supplied by the inventors, news correspondents obtained the following quote: "Composite materials using microfibers of cellulose have recently been investigated enthusiastically. It is known that cellulose exhibits a low coefficient of linear expansion, a high modulus of elasticity, and a high strength due to the extended chain crystals thereof. In addition, cellulose has attracted an attention as a material that exhibits high transparency when microfibrillated to give a composite material.
"For example, PTL 1 discloses a method for preparing microfibrillated cellulose fibers by subjecting cellulose fiber raw materials composed of purification-treated wood flour to a fibrillation treatment using an ultrahigh pressure homogenizer. Further, PTL 2 discloses a method for preparing microfibrillated cellulose fibers by carrying out a fibrillation treatment using an ultrasonic irradiation apparatus."
Supplementing the background information on this patent, VerticalNews reporters also obtained the inventors' summary information for this patent: "Technical Problem
"However, composite materials of the cellulose fibers prepared using fibrillated cellulose fibers obtained by the preparation methods described in PTLs 1 and 2 have a problem that they undergo high coloration when heated.
"Examples of the typical applications of a fibrillated cellulose composite having high transparency, non-coloration, and a low coefficient of linear expansion include transparent substrate materials for electric/electronic devices typified by a flat panel display, an organic LED illumination, a solar light electricity generation panel, and the like, but in the preparation steps for these devices, it may be necessary to subject the transparent substrate material to a heating treatment. Therefore, in particular, in these applications, the materials that undergo coloration by a heating treatment are not preferable.
"An object of the present invention is to provide technology capable of providing a cellulose fiber assembly and a cellulose fiber composite, each of which has a low coloration by a heating treatment.
"Solution to Problem
"The present inventors have made extensive studies, and as a result, they have found that the coloration of a cellulose fiber assembly obtained and a cellulose fiber composite prepared using the same is reduced by carrying out a reduction treatment of cellulose in any of the preparation steps until the cellulose fiber assembly is obtained from the cellulose fiber raw materials, thereby completing the present invention.
"That is, the present invention is as follows.
"1. A method for preparing a cellulose fiber assembly, including:
"a fibrillation step of fibrillating cellulose fiber raw materials to obtain fibrillated cellulose fibers,
"an assembly preparation step of obtaining a cellulose fiber assembly using the fibrillated cellulose fiber, and
"a step of carrying out a reduction treatment.
"2. The method for preparing a cellulose fiber assembly as described in 1, in which the cellulose fiber assembly obtained in the assembly preparation step is subjected to the reduction treatment.
"3. The method for preparing a cellulose fiber assembly as described in 1 or 2, further including a step of carrying out a chemical modification treatment.
"4. A cellulose fiber assembly prepared by the method for preparing a cellulose fiber assembly as described in any one of 1 to 3.
"5. A cellulose fiber composite including the cellulose fiber assembly as described in 4 and a matrix material.
"6. A method for preparing fibrillated cellulose fibers, in which cellulose fiber raw materials are subjected to a fibrillation treatment, a reduction treatment, and a chemical modification treatment.
"7. Fibrillated cellulose fibers prepared by the method for preparing fibrillated cellulose fibers as described in 6.
"8. A cellulose fiber composite including the fibrillated cellulose fibers as described in 7 and a matrix material.
"Advantageous Effects of Invention
"According to the preparation method of the present invention, a cellulose fiber assembly and a cellulose fiber composite, each of which has low coloration and inhibition of an increase in the coloration even when being heating-treated can be obtained."
For the URL and additional information on this patent, see: Umemoto, Tomokazu; Akai, Hideko; Noishiki, Yasutomo; Banzashi, Go.
Keywords for this news article include:
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