| 摘要 |
PURPOSE:To improve the physical strength of the title material and the cooling efficiency of the resin increasing a crystallization rate of the resin by incorporating a prescribed amount of a specified additive in a crystalline polypropylene PP resin and a straight chain low density polyethylene (L-LDPE) resin. CONSTITUTION:The wrapping material comprises the shading film layer composed of the L-LDPE type resin contg. 5-40wt.% the crystalline PP resin, >=30wt.% the L-LDPE resin, 0.1-30wt. a shading substance, 0.01-1.0wt.% an antioxidant, 0.01-3.00wt.% an org. nucleus forming agent and 0.01-6.00wt.% a lubricant. The crystalline PP resin is exemplified by a propylene homopolymer or a random copolymer of propylene and alpha-olefin, etc., and L-LDPE resin is so called a 3rd. polyethylene resin, and has the advantages of both a middle-low pressure and a high pressure polyethylene resins. Thus, the physical strength such as the tensile strength and the bursting strength, etc., of the material is improved, and also the forming speed of a film is improved. |
