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AssigneeIdemitsu Petrochemical Co., Ltd.
InventorsItaru Kuramoto, Yutaka Obata, Tsuyoshi Ota, Toshio Isozaki, Junichi Amano, Takashi Sumitomo
Estimating the term…
A first crystalline polypropylene of the present invention satisfies the relationships of the following formulae (1) and (2): α≦−0.42×ln(Mp)+7.3 (1),and Tm>1.85×ln(Mp)+144.5 (2), wherein α is a 0° C. soluble content (% by weight) as measured through programmed-temperature fractionation, Mp is a peak molecular weight in a molecular weight distribution curve as measured through gel permeation chromatography, and Tm is a melting point (° C.) as measured through differential scanning calorimetry. A second crystalline polypropylene of the present invention satisfies the relationship given in the following formula (3): α≦1.11[η]−0.42+1.40 (3) wherein α is the same as above and [η] an intrinsic viscosity (dl/g) as measured in a tetralin solvent at 135° C. Moldings and films made of the first or second crystalline polypropylene are highly rigid and have good heat resistance and good scratch resistance.
A crystalline polypropylene, wherein a 0° C. soluble content α (% by weight) as measured through programmed-temperature fractionation and a peak molecular weight Mp in a molecular weight distribution curve as measured through gel permeation chromatography satisfy the relationship given in the following formula (1):
A crystalline polypropylene, wherein a 0° C. soluble content α (% by weight) as measured through programmed-temperature fractionation and an intrinsic viscosity [η] (dl/g) as measured in a tetralin solvent at 135° C. satisfy the relationship given in the following formula (3):
Dependencies are inferred from the claim text.