Water-dispersible cellulose and process for producing the same
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[0072] The important point of the production method of the water-dispersible cellulose of the present invention is, briefly, to extract the cellulose microfibrils contained in the raw material in a form as micronized as possible without fiber shortening. The term "fiber shortening" as used herein refers to the shortening of the fiber length of cellulose microfibers by cutting or the like, or the state itself that the fibers have been shortened. The term "micronization" refers to the reduction of the fiber diameter of cellulose microfibers by, for example, a tearing operation, or the state itself in which the fiber diameter has been reduced. According to the prior art, the process of "micronization" is more or less accompanied by the process of "fibre shortening", since there is no device that can produce only "micronization" by merely providing a shearing action.
[0073] In particular, "fiber shortening" tends to occur when the average degree of polymerization of the starting...
Embodiment 1
[0213] Commercially available wood pulp (average degree of polymerization = 1,710, α-cellulose content = 93% by weight) was cut into 6 x 12 mm rectangles and immersed in a sufficient amount of water. Immediately thereafter, the slurry was removed from the water and the water was filtered through a sieve. At that time, the water content was 74% by weight. When the wet slurry was passed through a cutting mill ("Comitrol" model 1700, manufactured by URSCHEL LABORATORIES, Inc., micro-cutting head / blade distance: 2.029 mm, impeller speed: 9,000 rpm) once, the fiber length became 0.25 to 3.25 mm (The content of components having a fiber length of 0.5 mm or more was about 98%).
[0214] The cut mill treated article and water were weighed to obtain a fiber content of 2% by weight, and the mixture was stirred until no entanglement between fibers was observed. The aqueous dispersion thus obtained was treated with a millstone rotary type pulverizer ("Cerendipiter" model MKCA6-3, manufa...
Embodiment 2
[0217] Commercially available wheat straw pulp (average degree of polymerization = 930, α-cellulose content = 68% by weight) was cut into rectangles of 6 x 12 mm. Water was added thereto to obtain a concentration of 4% by weight. The mixture was stirred for 5 minutes with a household mixer. When the mixture was dispersed for 1 hour with a high-speed rotary homogenizer (ULTRA-DISPERSER, model LK-U, manufactured by Yamato Kagaku), the fiber length became 4 mm or less.
[0218] The resulting aqueous dispersion was treated twice with a millstone rotary type pulverizer ("Cerendipiter" model MKCA6-3, grinder: MKE6-46, grinder rotation speed: 1,800 rpm) while changing the grinder gap to 60 to 40 µm, respectively. The aqueous dispersion thus obtained had a settled volume of 95% by volume.
[0219] Subsequently, the aqueous dispersion thus obtained was diluted with water to a concentration of 1% by weight, and the diluted dispersion was passed through a high-pressure homogenizer ("Mi...
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Abstract
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