摘要 |
A mixture of chlorinated diphenyls which has a solidification point below 14 DEG C. and preferably a flash point above 127 DEG C. is used as a dielectric. It may be made as described in Specification 358,703 by chlorinating diphenyl, or by mixing individual chlorinated diphenyls in eutectic proportions. In examples: (1) 75 parts of o-chlorodiphenyl are mixed with 25 parts of p-chlorodiphenyl. (2) 55 parts of the mixture of example (1) are mixed with 45 parts of diphenyl chlorinated as described in Specification 358,703 with iron as catalyst until its S.G. at 20 DEG C. is 1,379 corresponding to a chlorine content of about 42 per cent. |