公开(公告)号：US20040262802A1

公开(公告)日：2004-12-30

申请号：US10870957

申请日：2004-06-21

Applicant: JSP Corporation

Inventor： Kazuhiko Morita ,  Satoshi Iwasaki ,  Shinpei Arita

IPC: B29C044/24

CPC classification number: B32B27/32 ,  B29C44/22 ,  B32B5/18 ,  B32B27/065 ,  B32B27/18 ,  B32B27/22 ,  B32B37/153 ,  B32B2038/0084 ,  B32B2305/022 ,  B32B2307/21 ,  B32B2323/00

Abstract: A method of producing a composite sheet having a foam layer of a first polyolefin-based resin and a surface layer of a second polyolefin-based resin provided on at least one side of the foam layer and containing a polymeric antistatic agent. The method includes coextruding through die a first melt containing the first polyolefin-based resin and a physical blowing agent and a second melt containing the second polyolefin-based resin, the polymeric antistatic agent and a volatile plasticizer to obtain the composite sheet. The amount of the polymeric antistatic agent is 4 to 100 parts by weight per 100 parts by weight of the second polyolefin-based resin and the amount of the volatile plasticizer is 5 to 50 parts by weight per 100 parts by weight of a total amount of the second polyolefin-based resin and the polymeric antistatic agent. The second polyolefin-based resin has a crystallization temperature of Ta nullnull C.null and a melt viscosity of Ma nullPa.snull, while the polymeric antistatic agent has a crystallization temperature of Tb nullnull C.null and a melt viscosity of Mb nullPa.snull, wherein Ta, Tb, Ma and Mb satisfy the following conditions: Tb