| 摘要 |
PURPOSE:To obtain the titled foam, by mixing a specific polyethylene resin blend with a specific azodicarbonamide as a blowing agent to form a sheet, subjecting the sheet to electron radiation crosslinking and heating the sheet at the decomposition temperature of the blowing agent. CONSTITUTION:(A) A blend of 90-20wt% low-density polyethylene having 0.915-0.927g/cc density and 10-80wt% polyethylene resin which contains 4-10C alpha-olefin as a copolymerizable component and 0.910-0.945g/cc density is blended with (B) 1-30wt% azodicarbonamide having thermal decomposition characteristics at 200 deg.C constant temperature at 6 and 7min elapse of time of <=10cc/g and <=30cc/g, respectively, as a blowing agent to give a composition, which is molded into a sheet. The sheet is crosslinked by irradiation of electron radiation and heated by selecting a temperature which is higher than the decomposition temperature of the component B and makes average particle diameter of prepared foam in the thickness direction 100-2,000mu to give the aimed foam. |
