发明名称 |
UV-protected multilayered panels |
摘要 |
UV-stabilised, multilayer polycarbonate sheet (I) contains 1.1 a base sheet made of thermoplastic polycarbonate (PC) contg. no UV absorber or from 0 to 1 wt.% UV absorber, with a viscosity of 500-2500 Pa.s at 280 deg.C and a shear rate of 100 s<-1> and, on at least one side, 1.2 an outer layer of thermoplastic PC contg. 2-20 wt.% UV absorber (II), with a viscosity (under the above conditions) of 200-2300 Pa.s, which is at least 50 Pa.s lower than the viscosity of 1.1. Also claimed is a process for the prodn. of (I) by co-extrusion, by combining the melts for the core material and the outer layer(s) with the aid of a coextrusion adaptor and extruding the combination into the required form in a closed die. |
申请公布号 |
EP0716919(A2) |
申请公布日期 |
1996.06.19 |
申请号 |
EP19950119063 |
申请日期 |
1995.12.04 |
申请人 |
BAYER AG |
发明人 |
LOEWER, HARTMUT, DR.;ANDERS, SIEGFRIED, DR.;SCHMID, HELMUT, DR.;NISING, WOLFGANG, DR. |
分类号 |
B32B27/18;B29C47/06;B29K69/00;B29L9/00;B32B27/36;B32B37/00;B32B37/15 |
主分类号 |
B32B27/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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