Polypropylene series resin sheet
AssigneesChisso Corporation, Chisso Petrochemical Corporation
InventorsToshiki Yamamoto, Akinori Maekawa, Takanori Nakashima
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Abstract
This invention relates to a propylene series resin sheet that has a large tan δ and high frequency welding characteristics, excellent transparency, low-temperature impact resistance, and surface durability. The propylene series resin sheet is 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%.
Claims6
A propylene series resin, multi-layered sheet, including at least a layer of 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-α-olefin copolymer component (RC, with any α-olefin other than propylene), the propylene-α-olefin copolymer component (RC) having an intrinsic viscosity [η]RC of 6.5 dl/g or less, with a viscosity ratio [η]RC/[η]PP of the intrinsic viscosity [η]RC and an intrinsic viscosity [η]PP of the PP being about 0.6˜1.2, 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 [η]RC/[η]PP [([η]RC/[η]PP)×(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 5.0×10−3 (100 kHz) under a cohesive energy density of 60-90 cal/cm3.
Dependencies are inferred from the claim text.