Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1991-12-06
1994-01-04
Nutter, Nathan M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 5431, C08G 6348, C08G 6391
Patent
active
052760880
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a method of synthesizing cyclodextrin containing polymers, as well as a process for producing cyclodextrin containing solid membranes.
BACKGROUND ART
Cyclodextrin combines with various guest compounds in aqueous solutions to form structurally specific inclusion compounds. Thus, cyclodextrin containing solid membranes are expected to have unique performance, particularly in terms of separating and permeating capabilities and cyclodextrin, if it is supported on high polymers, is anticipated to exhibit various physical properties that have been impossible to obtain when it is used alone; since this brings about the advantage of expanded applications, it has been desired to develop a method by which cyclodextrin-containing membranes can be freely prepared.
As regards the preparation of such cyclodextrin membranes, Unexamined Published Japanese Patent Application No. 232210/1985 discloses a method in which the crystal of a cyclodextrin inclusion compound and a high polymer comprised of a compound having an isocyanate group are cast onto a commercial ultrafiltration membrane, and Unexamined Published Japanese Patent Application No. 258702/1987 discloses a method in which cyclodextrin reacted with a variety of monomers is copolymerized with acrylonitrile derivatives to obtain high polymers, which are then processed into membranes by known methods.
However, the method disclosed in Unexamined Published Japanese Patent Application No. 232210/1985, supra has the disadvantage that the cyclodextrin membrane cannot be used as the membrane of high polymer per se, whereas the method disclosed in Unexamined Published Japanese Patent Application No. 258702/1987 has had the problem that the degree of introduction of cyclodextrin in the obtained membrane of high polymer is so low as 3-4% that satisfactory characteristics cannot be achieved.
Therefore, the object of the present invention is to provide a method of synthesizing cyclodextrin polymers that enables cyclodextrin to be contained as introduced to high levels.
It is also the object of the present invention to provide a process for producing cyclodextrin membranes that contain cyclodextrin as introduced to high levels and that can be used on their own.
DISCLOSURE OF INVENTION
The present inventors conducted intensive studies under these circumstances and found, as a result, that the above-stated object of the present invention could be solved by a method of synthesizing cyclodextrin polymers characterized by reacting polyvinyl alcohol or derivatives thereof with cyclodextrin derivatives, and also by a process for producing cyclodextrin membranes by forming membranes using said cyclodextrin polymers.
In particularly preferred embodiments of the present invention, said polyvinyl alcohol derivatives are obtained by reacting polyvinyl alcohol with carbonyl compounds, or by acetalizing polyvinyl alcohol through reaction with aldehydes, or by reacting polyvinyl alcohol with ketones. It is also preferred that said cyclodextrin derivatives are aldehyde derivatives of cyclodextrin.
In another preferred embodiment of the present invention, cyclodextrin polymers are synthesized in such a way that said reaction between polyvinyl alcohol or derivatives thereof and cyclodextrin derivatives is carried out by grafting cyclodextrin derivatives onto polyvinyl alcohol or derivatives thereof for polymerization.
At the same time, the object of the present invention is attained by a method of synthesizing cyclodextrin polymers characterized by either copolymerizing cyclodextrin derivatives with methyl methacrylate or saponifying the polymers obtained by copolymerizing cyclodextrin derivatives with vinyl acetate, as well as by a process for producing cyclodextrin membranes by forming membranes using said cyclodextrin polymers. Further, the object of interest is attained by a method of synthesizing cyclodextrin polymers characterized by reacting cellulose derivatives with cyclodextrin or its derivatives, as well as by a process for producing cyc
REFERENCES:
patent: 4274985 (1981-06-01), Szejtli et al.
patent: 4357468 (1982-11-01), Szejtli et al.
Abstract of JP-A 63-314201, Dec. 22, 1988; Masaharu Horie, "Method for Immobilizing Cyclodextrin".
Abstract of JP-A 61-129566, Jun. 17, 1986; Toshiyuki Shono, "Methylated Cyclodextrin Stationary Phase and Liquid Chromatography Used Therein".
Abstract of JP-A 60-248729, Dec. 9, 1985; Kazuaki Harada, "Polycyclodextrin Resin Having Aminoalkylamino Group and its Production".
Abstract of JP-A 59-227906, Dec. 21, 1984; Iwao Tabuse, "Immobilized Cyclodextrin Amino Derivative and its Production".
Abstract of JP-A 55-75402, Jun. 6, 1980; Kouji Itagaki, "Fixing of Cyclodextrin".
Nutter Nathan M.
Toppan Printing Co. Ltd.
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