Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Carbohydrate doai
Patent
1998-03-16
2000-05-30
Peselev, Elli
Drug, bio-affecting and body treating compositions
Designated organic active ingredient containing
Carbohydrate doai
536 56, 536124, A61K 3170, C07H 100, C08B 1600
Patent
active
060691360
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a concentrate of cellulosic material (bacterial cellulose: "BC") which may be produced by culturing cellulose-producing bacteria, to a method for the improvement of dispersibility and suspensibility, and to a method for the improvement of properties of paper.
BACKGROUND ART
Since the bacterial cellulose is edible as well as tasteless and odorless, it is utilized in the food industry. The homogenized bacterial cellulose's high dispersibility in water further provides it with many industrial applications, such as to maintain particle sizes of food, cosmetics or coating agents, to strengthen food materials, to maintain moisture, to improve stability of food, and to be used as low-calorie additives and an emulsion stabilizer.
The bacterial cellulose is characterized by a sectional width of its fibrils which is smaller by two orders of magnitude than that of other kinds of cellulose fibers such as those derived from wood pulp.
Due to such structural and physical feature of microfibril, a homogenized bacterial cellulose has plenty of industrial applications as a strengthening agent for polymers, especially hydrophilic polymers. Products prepared by solidification of the homogenized bacterial cellulose in the form of a lump or paper show a high elastic modulus in tension owing to the above feature, and are therefore expected to have excellent mechanical properties for use in various kinds of industrial materials.
However, since an aqueous suspension or dispersion of the homogenized BC contains solvent such as water in an amount of a few to a few hundreds times the amount of cellulose component, it has some disadvantages such as the increase of space for storage, increase of the costs for storage and transportation, and decomposition of cellulose by bacteria during storage.
The present inventors have already proposed a method for drying of bacterial cellulose, comprising adding a third component other than water or BC to the aqueous BC suspension and dehydrating and drying (Japanese Patent Application Hei 7 (1995)-329472). According to this method, properties of BC such as solubility, dispesibility, precipitation degree and viscosity may be recovered when BC is returned from its dry state (water content is 25% by weight or less) to its aqueous suspension.
Although BC is used as an additive for paper, especially for the purpose of an improvement in yield on fillers, it will disadvantageously reduce its freeness in papermaking.
The present inventors have studied simple and economical methods for the production of BC having improved properties such as dispesibility, suspensibility and viscosity, so as to solve the above problems, and finally complete the present invention.
DISCLOSURE OF INVENTION
The present invention relates to a bacterial cellulose concentrate containing unhomogenized bacterial cellulose in an amount of the range between 10% by weight or more and less than 75% by weight, preferably between 25% by weight or more and less than 70% by weight.
The present invention also relates to a bacterial cellulose concentrate containing homogenized bacterial cellulose in an amount of the range between 4% by weight or more and less than 75% by weight, preferably between 10% by weight or more and less than 75% by weight.
Further, the present invention relates to a method for the improvement of dispersibility and suspensibility of bacterial cellulose, comprising concentrating an aqueous suspension of bacterial cellulose to a final concentration of the bacterial cellulose of between 10% by weight or more and less than 75% by weight, dispersing it again into an aqueous solution and homogenizing the bacterial cellulose in the resulting dispersion. The present invention accordingly relates to the aqueous suspension of bacterial cellulose thus prepared.
Further, the present invention relates to a method for the improvement of dispersibility and suspensibility of bacterial cellulose, comprising concentrating an aqueous suspension of homogenized bacterial cellulose to a final
REFERENCES:
patent: 4861427 (1989-08-01), Johnson et al.
patent: 4960763 (1990-10-01), Stephens et al.
patent: 5637197 (1997-06-01), Watt et al.
Hajouda Tadahiko
Hioki Nobuya
Miyashita Hiroshi
Morinaga Yasushi
Ougiya Hiroshi
Bio-Polymer Research Co., Ltd.
Peselev Elli
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