| 摘要 |
PURPOSE:To improve the resistance to curling and scuffing of the subject substrate by incorporating a specified copolymer in the surface covered layer of the substrate. CONSTITUTION:The substrate is constituted of a sheet-like base body such as a wood free paper, and the surface covered layer (A) mounted on the surface and back faces of the base body respectively. A polyolefin resin (A1) composing the layer (A) contains >=30wt.% of a linear low density copolymer (A2) which is composed of ethylene/alpha-olefin and has a density of 0.915-0.935g/cm<3>. The component (A2) is formed by copolymerizing ethylene and one or more of alpha- olefins (such as propylene) in the presence of a prescribed catalyst according to a low pressure vapor phase polymerization method, etc. The component (A1) is composed of a high density or a low density polyethylene. Additives such as a pigment (for example titanium oxide) etc. may be incorporated in the layer (A). |
