Patent GB-679853-A (GB)
Title: Improved production of anion exchange resins
IPC: C08F8/44
Filed: 1949-11-10
Abstract: Water-insoluble anion exchange resins are prepared by reacting at 25 DEG  to 100 DEG  C. a solid halogenated benzene insoluble copolymer containing in chemically combined form 0.5 to 40 parts of a polyvinyl aromatic hydrocarbon and 99.5 to 60 parts of a nuclear methyl monovinyl aromatic hydrocarbon having the vinyl radical and from 1 to 3 methyl radicals as nuclear substituents, said copolymer being halogenated both in the methyl radicals and in the aromatic nuclei, with a tertiary amine having only hydrocarbon groups attached to the nitrogen atom in amount such that at least one molecular proportion of the amine is present in the reaction mixture for each reactive halogen atom substituted in a methyl radical in the copolymer. Nuclear methyl monovinyl aromatic hydrocarbons specified are nuclear methyl, dimethyl and trimethyl styrenes, and nuclear methyl and dimethyl vinyl naphthalenes. Polyvinyl aromatic hydrocarbons specified are divinyl benzene, divinyl toluene, divinyl xylene, divinyl ethyl benzene, and divinyl naphthalene.  Ethyl vinyl benzene may be used in terpolymers in conjunction with the monovinyl and polyvinyl hydrocarbons.  Tertiary amines specified are trimethylamine, triethylamine, diethylmethylamine, tributylamine, tripropylamine, triamylamine, amyldiethylamine, dibutylmethylamine, dimethylethylamine, ethylmethylpropylamine, butylmethylpropylamine, amylbutylethylamine, benzyldimethylamine, dimethylphenylamine, pyridine, and diethylaniline.  The copolymers may be prepared in bulk or dispersion with the aid of heat, light, and pressure, catalysts such as hydrogen peroxide, benzoyl peroxide, lauroyl peroxide, acetylbenzoyl peroxide, potassium persulphate, ammonium persulphate, and sodium perborate, and dispersing agents such as sodium cellulose glycollate, hydroxyethyl cellulose, or methyl cellulose; the copolymers may be in granular form and may have powdered glass, asbestos, or diatomaceous earth incorporated therein.  The copolymers are halogenated by treatment with halogen with the aid of catalysts such as phosphorus, phosphorus trichloride, and ultraviolet light, while the copolymer is dispersed in or swollen by an organic liquid solvent such as carbon tetrachloride, benzene, chlorobenzene, ortho-dichlorobenzene, acetic acid, or trichloroethylene.  Amination of the halogenated copolymer may be carried out at normal, elevated, or reduced pressure in the presence or absence of dispersing media such as water, ethanol, or acetone and catalysts such as potassium bromide, potassium iodide, calcium iodide, cupric iodide, and cuprous chloride. Specification 654,706 is referred to.  The Specification as open to inspection under Sect. 91 includes the use of nuclear alkyl monovinyl aromatic compounds which contain as nuclear substituents 1 to 3 lower alkyl radicals containing 2 to 4 carbon atoms, other than tertiary alkyl radicals, such as nuclear ethyl and sec.-butyl styrenes.  There is also described the halogenation with chlorine and subsequent amination with trimethylamine of a copolymer containing in chemically combined form 50 parts of dimethylstyrene, 30 parts of ethyl vinyl benzene, and 20 parts of divinyl benzene.  This subject-matter does not appear in the Specification as accepted.