Patent GB-679852-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 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 alkyl monovinyl aromatic hydrocarbon having the vinyl radical and from 1 to 3 p alkyl radicals containing 2 to 4 carbon atoms, other than tert.-alkyl radicals, as nuclear substituents, the copolymer having reactive halogen attached to a carbon atom alpha to the aromatic nucleus and also containing nuclear halogenation, with an ammonia type nitrogen containing compound, the tervalent nitrogen atom of which is attached only to hydrogen or carbon atoms, in amount such that at least one ammonia type nitrogen atom is present in the reaction mixture for each reactive halogen atom attached to a carbon atom alpha to an aromatic nucleus of an alkyl radical in the copolymer.  Nuclear alkyl monovinyl aromatic hydrocarbons specified are nuclear ethyl, diethyl, and triethyl vinyl benzenes, nuclear sec.-butyl and isopropyl benzenes, and nuclear ethyl, diethyl and triethyl vinyl naphthalenes. Polyvinyl aromatic hydrocarbons specified are divinyl benzene, divinyl toluene, divinyl xylene, divinyl ethyl benzene and divinyl toluene.  Ammonia type nitrogen-containing compounds specified are ammonia, methylamine, ethylamine, propylamine, butylamine, hexylamine, aniline, ethylenediamine, diethylenetriamine, propylenediamine, dimethylamine, dibutylamine, dicyclohexylamine, hexylethylamine, methylethylamine, methylaniline, dimethylaniline, dimethylethanolamine, ethyldiethanolamine, butyldiisopropanolamine, benzylamine, cyclohexylamine, hexamethylenetetramine, trimethylamine, triethylamine, triethylamine, diethylmethylamine, tributylamine, dimethylisopropanolamine, tripropylamine, triamylamine, amyldiethylamine, dibutylmethylamine, dimethylethylamine, ethylmethylpropylamine, butylmethylpropylamine, and amylbutylethylamine.  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, sodium perborate, ammonium persulphate, potassium persulphate, and dispersing agents such as sodium cellulose glycollate, and methyl cellulose; the copolymers may be in granular form and may contain asbestos or powdered glass.  The copolymers are halogenated by treatment with a halogen with the aid of catalysts such as phosphorus, phosphorus trichloride, or ultra-violet light, while the copolymer is dispersed in or swollen by an organic liquid such as carbon tetrachloride, benzene, chlorobenzene, ortho dichlorobenzene, acetic acid, or tetrachloroethylene.  Amination of the halogenated copolymers may be carried out at normal, elevated, or reduced pressures, in the presence or absence of dispersing media such as water, ethanol, or acetone.  Specification 654,706 is referred to.  The Specification as open to inspection under Sect. 91, describes the amination with trimethylamine of a chlorinated copolymer containing in chemically combined form 53 parts of ethylvinylbenzene and 47 parts of divinyl benzene.  This subject-matter does not appear in the Specification as accepted.