公开(公告)号：WO2021071937A1

公开(公告)日：2021-04-15

申请号：PCT/US2020/054562

申请日：2020-10-07

申请人： MUCELL EXTRUSION, LLC

发明人： SANIEL, Mehdi ,  LINDENFELZER, Mark, E. ,  TORRACO, Nicholas, R. ,  SAKORAFOS, James, K.

IPC分类号： B29C48/16 ,  B29C55/28 ,  B32B5/18 ,  B32B27/08 ,  B29C48/0012 ,  B29C48/08 ,  B29C48/10 ,  B29C48/185 ,  B29C48/21 ,  B29C48/49 ,  B29C48/92 ,  B32B2250/03 ,  B32B2250/05 ,  B32B2250/40 ,  B32B2264/102 ,  B32B2264/104 ,  B32B2264/108 ,  B32B2266/025 ,  B32B2266/08 ,  B32B2266/104 ,  B32B2272/00 ,  B32B2307/402 ,  B32B2307/4026 ,  B32B2307/718 ,  B32B2307/72 ,  B32B2307/732 ,  B32B2311/18 ,  B32B2311/20 ,  B32B2313/04 ,  B32B2315/16 ,  B32B2323/043 ,  B32B2323/046 ,  B32B2323/10 ,  B32B2439/46 ,  B32B2439/70 ,  B32B27/065 ,  B32B27/20 ,  B32B27/302 ,  B32B27/304 ,  B32B27/306 ,  B32B27/308 ,  B32B27/32 ,  B32B27/34 ,  B32B27/36 ,  B32B27/40 ,  B32B37/153 ,  B32B5/20

摘要： A multilayer foam film with an enhanced perceived surface whiteness comprising for light-blocking, signage, and general packaging application is disclosed. In an embodiment, the film has a bulk density of less than 0.962 gr/cm3 wherein more than 50% of the cells in the foam layer are closed cells. In an embodiment, the multilayer foam film has a thickness greater than 1 mil and one of the solid skin layers contains white pigment. In another embodiment the white skin layer has a skin whiteness value of greater than 80 according to ASTM E313-73, and a skin layer tint value of less than 1 according to ASTM E313-73, and The lightness value (L*) of the white skin layer of greater than 90 in CIE L*a*b* dimension according to ASTM E308. In an embodiment, the film has a very smooth surface with a smoothness value of less than 25 in Sheffield smoothness unit configuration according to TAPPI T 538.