| 摘要 |
PURPOSE:To obtain the title compsn. useful for making a communication cable covered with a highly expanded insulating material by compounding polyethylene with a specified amt. of a blowing agent comprising benzenesulfonylhydrazide and azodicarbonamide. CONSTITUTION:The title compsn. is prepd. by compounding polyethylene with 1.2-2.5wt.% blowing agent comprising benzenesulfonylhydrazide (OBSH) and azodicarbonamide (ADCA). The amt. of ADCA acounts for 10-40wt.% of the total amt. of the blowing agent, while the upper limit of the amt. of OBSH is 20wt.%. The total amt. less than 1.2wt.% gives an expansion ratio of only about 60%; that more than 2.5wt.% does not further increase the expansion ratio. The compsn., when expanded, shows an expansion of about 70% without generating cells with too large a diameter and gives a communication cable excellent in electrical properties and mechanical strengths. |
