Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1996-11-13
1998-03-24
Teskin, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526206, 526207, 526210, 526212, 5262196, 5262929, 526336, 521147, C08F21236, C08F21212, C08F 218
Patent
active
057313954
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a novel functional group-containing porous resin and a process for preparing the same.
BACKGROUND ART
Porous materials, because of their structural characteristics and chemical properties, have been heretofore researched, developed and used in various fields for various applications as packing for analytical or preparative columns, supports for enzymes or catalysts, supports for adsorption of useful substances and so on. Typical examples are inorganic materials such as porous silica gel and alumina, and synthetic high molecular weight materials such as divinylbenzene-styrene porous resins and divinylbenzene-methacrylic acid porous resins.
Silica gel, which has high mechanical strength, is widely used as column packings and catalyst supports by itself or in the form as modified with various functional groups or functional substances utilizing a silanol group on its surface. However, silica gel has problems associated with its inherent chemical stability, namely a low stability in a basic medium or vol.22, p.386 (1984) and J. Chromatogr. vol.149, p.199 (1978)!.
On the other hand, conventional processes for preparing divinylbenzene-styrene porous resins have been long known. For example, according to a known process, a divinylbenzene-styrene monomer mixture is mixed with an organic solvent, and the obtained solution is subjected in water to suspension polymerization using a radical polymerization initiator, the organic solvent being what is called a porogen which does not participate in polymerization and which is sparingly soluble in water, the monomer mixture being soluble in said organic solvent but the Polym. Sci., vol.26, p.3205 (1981) and Anal. Chem., vol.52, p.2425 (1980)!. Generally this type of porous resin prepared by suspension polymerization is of the order of .mu.m to mm units in the diameter of apparent particles (hereinafter referred to as "secondary particles"), and, when externally or internally observed under an electron microscope, is seen to be a firm agglomerate of finer particles having a size of the order of nm unit (hereinafter referred to as "primary particles"). Stated more specifically, the interstices between agglomerated primary particles are hollows occupied by the organic solvent during the polymerization. The primary particles, being highly crosslinked resins, are insoluble in most of organic solvents and are basically substantially free from swelling. The porous resins prepared by this process have a large specific surface area, a high mechanical strength and a high chemical stability and, therefore, find wide applications as supports and as column packings for analytical or preparative purposes.
Divinylbenzene-styrene porous resins can be imparted new functions by chemical modification or due to the presence of a functional group-containing monomer (so-called functional monomer) on the surface of primary particles and/or in the neighborhood thereof, making good use of the superior mechanical strength and the high chemical stability of the constituent base resin. Thus, those resins have attracted great attention as the so-called functional porous resins in a wide variety of applications. Fundamentally two methods are known for giving new functions to the porous resin: (i) a method in which various functional groups or functional substances are chemically attachd to the synthesized divinylbenzene-styrene porous resin using the aromatic ring or the remaining vinyl group of the porous resin; and (ii) a method in which a mixture of a divinylbenzene-styrene monomer and a functional monomer is polymerized. The method (i), however, suffers various drawbacks. For example, because the chemical reaction proceeds essentially between the solid and the liquid, the reaction often requires rigorous reaction conditions and results in an extremely low conversion. Further, secondary particles may be deformed during the reaction. The method (ii) is also defective as follows. The method (ii) has difficulty in effectively arranging or ori
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Shim, Jae Hu et al; "Polymer-Supported Crown Ethers. 5. Syntheses of Lariat Azacrown Ethers", Pollimo, vol. 16, No. 3, (1992) (S. Korea), pp. 285-290.
Arakawa Chemical Industries Ltd.
Teskin Fred
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