公开(公告)号：EP4163079A1

公开(公告)日：2023-04-12

申请号：EP22200296.6

申请日：2022-10-07

申请人： Maxell, Ltd.

发明人： YUSA, Atsushi ,  MIZUTANI, Kei ,  YAMAMOTO, Satoshi ,  GOTO, Toshiharu ,  TANIGUCHI, Satoki

IPC分类号： B29C44/04 ,  B29C44/06 ,  B29C44/14 ,  B29C44/24 ,  B29C44/32 ,  B29C44/56 ,  B29C44/22 ,  B29C44/50 ,  B29L7/00

摘要： A resin sheet is provided that provide both light-weight properties and mechanical strength using a thermoplastic resin with high deflection temperature under load. The resin sheet 1 is formed from a thermoplastic resin, including: a core layer 2, the core layer being a foam resin layer; and skin layers 3 located outward of the core layer 2 as determined along the thickness direction, the core and skin layers forming a continuity. The core layer 2 includes a region A1 and regions A2 each located between the region A1 and the associated skin layer 3. The regions A2 has a lower average porosity than the region A1, said average porosity being lower than 50 %. The thermoplastic resin has a deflection temperature under load not lower than 90 °C. The resin sheet has a thickness of 1 to 40 mm. Each skin layer has a thickness of 5 to 50 % of the thickness of the resin sheet. Thus, in a thermoplastic resin having a deflection temperature under load not lower than 90 °C, the thickness of the resin sheet and the thickness of the skin layers are appropriate, thereby providing both light-weight properties and strength.