| 摘要 |
PURPOSE:To enhance resistance to being shaved on the surface and the appearance of winding by laminating given specific polyester on at least one surface of thermoplastic resin, providing given projections on the surface of said polyester layer and making the sum of Young's modulus in the longitudinal direction and that of width direction in the given range. CONSTITUTION:Polyester composed of ethylene naphthalate or ethylene alpha,beta-bis(2- chlorophenoxy)ethane-4,4'-dicarboxylate of 0.01-2.5mum thickness as main components is laminated at least on one surface of thermoplastic resin. 80% or more of projections out of the all projections of 20mum or more height on the surface of said polyester layer satisfies the formula (1) regarding the relation between the projection height (h) (unit mum) and projection end curvature radius beta(unit mum). The sum of Young's modulus in the longitudinal and width directions is 700-1,700kg/mm<2>, and the difference between thermoplastic resin and polyester crystallization parameter DELTATcg is 10 deg.C or over. When the melting viscosity of polyester is higher than thermoplastic resi, preferably higher by 2000 poise, the appearance of winding is still better. |
