Propylene polymer, propylene block copolymer, process for preparing said polymer and said block copolymer, and propylene polymer composition

A propylene block copolymer having such properties that:

• a melt flow rate (MFR) of said copolymer at 230° C. under a load of 2.16 kg is in the range of 0.1 to 500 g 10 min,
• a pentad isotacticity M5 obtained from the following formula (1A) using absorption intensity Pmmmm, Pw, Sαγ, Sαδ+ and Tδ+δ+ in a 13C-NMR spectrum of a boiled heptane-insoluble component contained in said copolymer is in the range of 0.970 to 0.995,
• a pentad tacticity M3 obtained from the following formula (2A) using absorpiton intensity Pmmrm, Pmrmr, Pmrrr, Prmrr, Prmmr, Prrrr, Pw, Sαγ, Sαδ+ and Tδ+δ+ in a 13C-NMR spectrum of a boiled heptane-insoluble component contained in said copolymer is in the range of 0.0020 to 0.0050, and
• a crystallinity of a boiled heptane-insoluble component contained in said copolymer is 65% to about 79.3%;
• M 5 = Pmmmm Pw - 2 ⁢ ( S ⁢ ⁢ α ⁢ ⁢ γ + S ⁢ ⁢ αδ + ) + 3 ⁢ ( T ⁢ ⁢ δ + ⁢ δ + ) (1A)
• wherein
• Pmmmm is absorption intensity of methyl groups present in the third unit among continuous five propylene units which are bonded to each other with meso form,
• Pw is absorption intensity of all methyl groups in a propylene unit,
• Sαγ is absorption intensity of such secondary carbons that are present in a main chain and out of two kinds of tertiary carbons positioned nearest to said secondary carbons one is situated at the α position and the other is situated at the γ position,
• Sαδ+ is absorption intensity of such secondary carbons that are present in a main chain and out of two kinds of tertiary carbons positioned nearest to said secondary carbons one is situated at the α position and the other is situated at the δ position or farther than the δ position, and
• Tδ+δ+ is absorption intensity of such tertiary carbons that are present in a main chain and out of two kinds of tertiary carbons positioned nearest to said tertiary carbons one is situated at the δ position or farther than the δ position and the other is also situated at the δ position or farther than the δ position;
• M 3 = Pmmrm + Pmrmr + Pmrrr + Prmrr + Prmmr + Prrrr Pw - 2 ⁢ ( S ⁢ ⁢ α ⁢ ⁢ γ + S ⁢ ⁢ αδ + ) + 3 ⁢ ( T ⁢ ⁢ δ + ⁢ δ + ) (2A)
• wherein
• Pmmrm is absorption intensity of methyl groups present in the third unit among continuous five propylene units represented by ┘┘┘┐┐ in which ┘ and ┐ are each a propylene unit,
• Pmrmr is absorption intensity of methyl groups present in the third unit among continuous five propylene units represented by ┘┘┐┐┘ in which ┘ and ┐ are each a propylene unit,
• Pmrrr is absorption intensity of methyl groups present in the third unit among continuous five propylene units represented by ┘┘┐┘┐ in which ┘ and ┐ are each a propylene unit,
• Prmrr is absorption intensity of methyl groups present in the third unit among continuous five propylene units represented by ┐┘┘┐┘ in which ┘ and ┐ are each a propylene unit,
• Prmmr is absorption intensity of methyl groups present in the third unit among continuous five propylene units represented by ┐┘┘┘┐ in which ┘ and ┐ are each a propylene unit,
• Prrrr is absorption intensity of methyl groups present in the third unit among continuous five propylene units represented by ┘┐┘┐┘ in which ┘ and ┐ are each a propylene unit,
• Pw, Sαγ, Sαδ+ and Tδ+δ+ have the same meanings as defined in the above formula (1A).

A propylene block copolymer having such properties that:

• a melt flow rate (MFR) of said copolymer at 230° C. under a load of 2.16 kg is in the range of 12.5 to 300 g/10 min,
• a pentad isotacticity M5 obtained from the following formula (1A) using absorption intensity Pmmmm, Pw, Sαγ, Sαδ+ and Tδ+δ+ in a 13C-NMR spectrum of a boiled heptane-insoluble component contained in said copolymer is in the range of 0.970 to 0.995,
• a pentad tacticity M3 obtained from the following formula (2A) using absorpiton intensity Pmmrm, Pmrmr, Pmrrr, Prmrr, Prmmr, Prrrr, Pw, Sαγ, Sαδ+ and Tδ+δ+ in a 13C-NMR spectrum of a boiled heptane-insoluble component contained in said copolymer is in the range of 0.0020 to 0.0050, and
• a crystallinity of a boiled heptane-insoluble component contained in said copolymer is 68 to about 79.3%;
• M 5 = Pmmmm Pw - 2 ⁢ ( S ⁢ ⁢ α ⁢ ⁢ γ + S ⁢ ⁢ αδ + ) + 3 ⁢ ( T ⁢ ⁢ δ + ⁢ δ + ) (1A)
• wherein
• Pmmmm is absorption intensity of methyl groups present in the third unit among continuous five propylene units which are bonded to each other with meso form,
• Pw is absorption intensity of all methyl groups in a propylene unit,
• Sαγ is absorption intensity of such secondary carbons that are present in a main chain and out of two kinds of tertiary carbons positioned nearest to said secondary carbons one is situated at the α position and the other is situated at the γ position,
• Sαδ+ is absorption intensity of such secondary carbons that are present in a main chain and out of two kinds of tertiary carbons positioned nearest to said secondary carbons one is situated at the α position and the other is situated at the δ position or farther than the δ position, and
• Tδ+δ+ is absorption intensity of such tertiary carbons that are present in a main chain and out of two kinds of tertiary carbons positioned nearest to said tertiary carbons one is situated at the δ position or farther than the δ position and the other is also situated at the δ position or farther than the δ position;
• M 3 = Pmmrm + Pmrmr + Pmrrr + Prmrr + Prmmr + Prrrr Pw - 2 ⁢ ( S ⁢ ⁢ α ⁢ ⁢ γ + S ⁢ ⁢ αδ + ) + 3 ⁢ ( T ⁢ ⁢ δ + ⁢ δ + ) (2A)
• wherein
• Pmmrm is absorption intensity of methyl groups present in the third unit among continuous five propylene units represented by ┘┘┘┐┐ in which ┘ and ┐ are each a propylene unit,
• Pmrmr is absorption intensity of methyl groups present in the third unit among continuous five propylene units represented by ┘┘┐┐┘ in which ┘ and ┐ are each a propylene unit,
• Pmrrr is absorption intensity of methyl groups present in the third unit among continuous five propylene units represented by ┘┘┐┘┐ in which ┘ and ┐ are each a propylene unit,
• Prmrr is absorption intensity of methyl groups present in the third unit among continuous five propylene units represented by ┐┘┘┐┘ in which ┘ and ┐ are each a propylene unit,
• Prmmr is absorption intensity of methyl groups present in the third unit among continuous five propylene units represented by ┐┘┘┘┐ in which ┘ and ┐ are each a propylene unit,
• Prrrr is absorption intensity of methyl groups present in the third unit among continuous five propylene units represented by ┘┐┘┐┘ in which ┘ and ┐ are each a propylene unit,
• Pw, Sαγ, Sαδ+ and Tδ+δ+ have the same meanings as defined in the above formula (1A), and
• wherein said propylene block copolymer contains 10-10,000 ppm of polymer comprising constituent units derived from a compound represented by the following formula (i) or (ii):
• H2C═CH—X (i)
• H2C═CH—CH2—X (ii)
• wherein X is a cycloalkyl group, an aryl group or
• M is carbon or silicon, R1 and R2 are each a hydrocarbon group, and R3 is hydrogen or a hydrocarbon group.