Patent ID: 6495632
Filing Date: 2002-12-17
Classification: B32B,C08J,C08L,Y10T

Abstract:
A propylene series resin sheet characterized by a mixture of a polypropylene series composition with a weight percentage of 50-99% and an ethylene series copolymer with a weight percentage of 1-50%,wherein the polypropylene series composition comprises a crystalline polypropylene component (PP) and a propylene-&agr;-olefin copolymer component (RC, with any &agr;-olefin other than propylene), the propylene-&agr;-olefin copolymer component (RC) having an intrinsic viscosity [&eegr;]RC of 6.5 dl/g or less, with a viscosity ratio [&eegr;]RC/[&eegr;]PP of the intrinsic viscosity [&eegr;]RC and an intrinsic viscosity [&eegr;]PP of the PP being about 0.6Ëœ1.2, a weight of the PP represented as WPP, a weight of the RC represented as WRC, a multiplying product of a weight ratio WPP/WRC and the viscosity ratio [&eegr;]RC/[&eegr;]PP ([&eegr;]RC/[&eegr;]PP)Ã—(WPP/WRC) being in a range between 0.2 to 4.5 for the polypropylene series composition, and wherein the ethylene series copolymer has a peak value of a dielectric loss tangent larger than 5.0Ã—10âˆ’3 (100 kHz) under a cohesive energy density of 60-90 cal/cm3.