| 摘要 |
Viscous organic solutions comprise a liquid organic non-polar solvent which is an aromatic or aliphatic hydrocarbon which may be halogenated, a mononitrated aromatic hydrocarbon, a cycloaliphatic hydrocarbon, a trialkyl or triaryl phosphate, an alkyl or aryl thio-ether and/or carbon disulphide, and a thermoplastic copolymer (free of cross-linking between the polymer chains) of monoethylenically unsaturated monomers containing 0.05-3 mole per cent of a monocarboxylic acid or 0.05-10 mole per cent of a 1,2-dicarboxylic acid or anhydride at least some of the acid or anhydride having been neutralized to carboxylate by reaction with a metal oxide, hydroxide or salt provided that the dicarboxylic acid is neutralized to provide no more than 3 mole per cent of the dicarboxylate. The copolymer may be derived from styrene and acrylic acid or vinylbenzoic acid, from styrene, ethyl acrylate and maleic anhydride, or from p-tert.-butylstyrene and acrylic acid, by polymerizing the monomers in bulk. The solvent may be toluene, hexane, 1,2,3 - trimethylbenzene, 0-, m- or p-xylene, benzene, chlorobenzene, o-dichlorobenzene, 1-methylnaphthalene, methylene chloride, chloroform, carbon tetrachloride, tetrachloroethylene, diethyl sulphide, nitrobenzene or petrol. The metal may be an alkali or alkaline earth metal, zinc, lead, copper, aluminium or iron e.g. a lithium, sodium or potassium dodecyl phenolate. |
