公开(公告)号：EP3865285A1

公开(公告)日：2021-08-18

申请号：EP19871892.6

申请日：2019-10-09

Applicant: Sunallomer Ltd

Inventor： NAKAJIMA, Takeshi ,  IKEDA, Masayuki ,  KATAGIRI, Akihiro

IPC: B29C65/18 ,  B29C48/16 ,  B29C55/12 ,  B32B27/32

Abstract: A method for producing a polypropylene sheet having a thickness of 0.5 to 5 mm, the method comprising;
a step 1 of preparing a precursor in which a first biaxially oriented polypropylene film having a thickness of less than 0.15 mm and a melting point Tmh and a second biaxially oriented polypropylene film having a thickness of less than 0.15 mm and a melting point of Tml are alternately laminated;
a step 2 of bringing a heating element into contact with an outermost layer of the precursor to thermally seal layer of the films, where Tmh − Tml ≥ 8 ° C where the melting point is measured by a differential scanning calorimeter (DSC) under the condition at 30°C to 230°C and a heating rate of 10°C/min.