Claims
- 1. 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.
- 2. The multi-layered sheet as claimed in claim 1, wherein the polypropylene series composition comprises a crystalline polypropylene component (PP) that contains a propylene-α-olefin copolymer with a propylene content of 90% or more by weight and a propylene-α-olefin copolymer component (RC).
- 3. The multi-layered sheet as claimed in claim 1, wherein the polypropylene series composition comprises a crystalline polypropylene component (PP) and a propylene-α-olefin copolymer component (RC) that contains a propylene-α-olefin copolymer (any α-olefin other than propylene) with a α-olefin content of 10-60% by weight.
- 4. The multi-layered sheet as claimed in claim 1, wherein the polypropylene series composition comprises a crystalline polypropylene component (PP) and a propylene-α-olefin copolymer component (RC) that contains a propylene-ethylene copolymer with an ethylene content of 15-60% by weight.
- 5. The multi-layered sheet as claimed in claim 1, wherein the ethylene series copolymer includes copolymers of ethylene with unsaturated carboxylic acid, its derivatives or vinyl ester.
- 6. The multi-layered sheet as claimed in claim 1, wherein the ethylene series copolymer includes copolymers of ethylene with unsaturated carboxylic acid or its derivatives.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2000-181353 |
Jun 2000 |
JP |
|
CROSS-REFERENCE TO RELATED APPLICATION
This application is a divisional application of, and claims the priority benefit of, U.S. application Ser. No. 09/863,951 filed on May 23, 2001 and now U.S. Pat. No. 6,495,632.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
6495632 |
Yamamoto et al. |
Dec 2002 |
B2 |
6511755 |
Mochizuki et al. |
Jan 2003 |
B1 |