| 摘要 |
PROBLEM TO BE SOLVED: To obtain a sheet capable of thermoforming within a wide range of temperature and reduced in curl after sealed with an aluminum foil by compounding plural polypropylenes having a specific melting point difference, a petroleum resin, and at least one filler selected among needle, fibrous and plate fillers. SOLUTION: There is provided a sheet comprising a resin composition obtained by admixing 100 pts.wt. of a mixture of two kinds of polypropylenes having a melting point difference measured by a differential scanning calorimetry of 3-40 deg.C and containing 95-60 wt.% of a higher-melting-point polypropylene having a melting point of at least 150 deg.C, 1-30 pts.wt. of a petroleum resin having a mol.wt. of not more than 3,000 and a softening point of 50-160 deg.C and 0.1-20 pts.wt. of at least one selected among fibrous, needle and plate fillers. As the polypropylenes are employed homopolymers, or a combination of a homopolymer with a random copolymer or a block copolymer and the content of a low mol. wt.component having a mol.wt. of not more than 10,000 is preferably 5 wt.% or less. As the petroleum resin, there can be exemplified a dicyclopentadiene- based resin, an aromatic (9C hydrocarbon-based) petroleum resin, an aliphatic (5C hydrocarbon-based) petroleum resin and the like.
|
