| 摘要 |
Curable compositions comprise an ethylene polymer, 0,1 to 10% by weight of the polymer of a heat-activated ethylene polymer cross-linking agent and 0,05 to 5% by weight of the polymer of symmetrical di-b -naphthyl-paraphenylene diamine. The cross-linking agent may be dicumyl peroxide, bis(a -methyl-a -ethylbenzyl) peroxide, bis(a ,a -diethyl benzyl) peroxide, bis(a ,a -dipropyl benzyl) peroxide, bis(a ,a -dimethyl naphthyl-methyl) peroxide, di-(tertiary butyl) peroxide, di(tertiary amyl) peroxide, tertiary-butyl-tertiary-amyl peroxide, tertiary-butyl-pentamethyl ethyl peroxide, tertiarybutyl-pentamethylpropyl peroxide or preferably 2,5-bis(tertiary butyl peroxy)-2,5-dimethyl hexane which may be deposited on a carrier, e.g. silica. The compositions may also contain fillers, e.g. carbon black, silica, alumina, silicates, carbonates and oxides; lubricants; antistatic agents; dyes and blowing agents. They may be cured by heating to give age-resistant cross-linked ethylene polymers.ALSO:2, 5 - Bis (tertiary butylperoxy) - 2, 5 - dimethyl hexane may be prepared by heating 2, 5 - dihydroperoxy - 2, 5 - dimethylhexane with tertiary butanol in the presence of sulphuric acid. |
