| 摘要 |
A synthetic drying oil is prepared by polymerizing, using 1.2 to 8 parts of an alkali metal catalyst per 100 of monomers, a C4 cut obtained by steam cracking a petroleum fraction either alone or mixed with a minor amount of styrene. It is preferred that an acyclic ether or a cyclic ether having oxygen atoms separated by at least two carbon atoms is used as a codiluent and that the temperature of polymerization is from 50-100 DEG C. An approximate composition of the C4 cut shows that butenes butadiene-1.3, and butanes predominate. Up to 50 per cent, based on the catalyst, of an alcohol, e.g. isopropanol, isobutanol, isopentanol, sec.-butanol and t-butanol may be present. Specified ethers are diethyl ether, methylal, ethylol methyl acetal, t-butyl methyl ether, diethyl acetal, vinyl isobutyl ether, dihydropyrane, dioxane, dioxolane, paraldehyde and glycol ethylidene diacetal. The process may be batch or continuous and the catalyst destroyed by excess of an anhydrous C1-C5 fatty acid, e.g. acetic and pentanoic acids.
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