POLYESTER SHEET FOR MOLDING AND POLYESTER MOLDED BODY

摘要

PURPOSE:To eliminate the welding to a mold and to perform molding within a wide temp. range by laminating specific thermoplastic polyester A to both surfaces of specific thermoplastic polyester B and setting the constitutional thickness ratio (A : B) of the polyester A and the polyester B to a specific range. CONSTITUTION:Polyester A is laminated to both surfaces of polyester B and the m.p. of the polyester A constituting a polyester film must be set to 180 deg.C or higher and it is necessary that DELTATcg defined by the difference (Tcc-Tg) of the cold crystallization temp. (Tcc) and glass transition temp. (Tg) of said polyester is 50 deg.C or lower. DELTATcg of the polyester B must be set to 60 deg.C or higher. It is necessary that the constitutional thickness ration (A : B) of the polyester A and the polyester B is 1 : 80 - 1 : 4.