Propylene polymers and resin composition and molding containing the polymers

1. A propylene homopolymer satisfying:

(1) a 25° C. hexane soluble content (H25) of 0–80 wt %;

(2) neither a melting temperature (Tm) nor a melting endotherm (ΔH) measurable by differential scanning calorimetry (DSC);

(3 a mesopentad fraction (mmmm) of 30–60 mol %:

(4) a racemic pentad fraction (rrrr) satisfying the following relationship:

{rrrr/(1−mmmm)}≦0.1;

(5) a fraction (W25) eluted at a temperature up to 25° C. by temperature programmed chromatography, of from 20–100 wt %; and

(6) a pentad fraction (rmrm) of more than 2.5 mol %.

2. The propylene homopolymer according to claim 1 , satisfying the following relationship:

( mm )×( rr )/( mr ) 2 ≦2.0

wherein (mm) is a meso triad fraction; (rr) is a racemic triad fraction; and (mr) is a triad fraction.

3. The propylene homopolymer according to claim 1 produced by polymerizing propylene in the presence of a polymerization catalyst containing:

(A) a transition metal compound represented by the general formula (I):

wherein M is a metal element of Groups 3 to 10 of the Period Table or lanthanoid series;

E 1 and E 2 are respectively a ligand selected from the group consisting of substituted cyclopentadienyl, indenyl, substituted indenyl, heterocyclopentadienyl, substituted heterocyclopentadienyl, amide, phosphide, a hydrocarbon group and a silicon-containing group, which form a cross-linked structure via A 1 and A 2 and may be the same or different,

X is a ligand capable of forming a σ-bond or π-bond with the proviso that when a plurality of X groups are present, these groups may be the same or different, and may be cross-linked with the other X group, E 1 , E 2 or Y;

Y is a Lewis base with the proviso that when a plurality of Y groups are present, these groups may be same or different, and may be cross-linked with the other Y group, E 1 , E 2 or X;

A 1 and A 2 are divalent cross-linking groups capable of bonding the two ligands E 1 and E 2 to each other, are respectively a C 1 –C 20 hydrocarbon group, a C 1 –C 20 halogen-containing hydrocarbon group, a silicon-containing group, a germanium-containing group, a tin-containing group, —O—, —CO—, —S—, —SO 2 —, —Se—, —NR 1 —, —PR 1 —, —P(O)R 1 —, —BR 1 — or —AlR 1 — wherein R 1 is a hydrogen atom, a halogen atom, a C 1 –C 20 hydrocarbon group or a C 1 –C 20 halogen-containing hydrocarbon group, and may be the same or different;

q is an integer of 1 to 5 given by the formula:

{(valence of M)−2}; and

r is an integer of 0 to 3, and

(B) a component selected from the group consisting of (B-1) a compound capable of forming an ionic complex by reacting with the transition metal compound (A) or a derivative thereof, (B-2) aluminoxane, and (B-3) a Lewis acid.

4. The propylene homopolymer according to claim 3 , wherein the transition metal compound represented by the general formula (I) is a transition metal compound represented by the general formula (II):

wherein, M, X, Y, A 1 , A 2 , q and r are the same as defined in the above general formula (I); R 2 through R 7 are respectively a hydrogen atom, a halogen atom, a C 1 –C 20 hydrocarbon group, a C 1 –C 20 halogen-containing hydrocarbon group, a silicon-containing group or a heteroatom-containing group with the proviso that at least one of R 2 through R 7 is not a hydrogen atom; and R 2 through R 7 may be the same or different, and adjacent groups of R 2 through R 7 may be bonded to each other to form a ring.

5. The propylene homopolymer according to claim 3 , wherein the transition metal compound represented by the general formula (I) is a transition metal compound represented by the general formula (II):

wherein, M, X, Y, A 1 , A 2 , q and r are the same as defined in the above general formula (I); R 2 through R 7 are respectively a hydrogen atom, a halogen atom, a C 1 –C 20 hydrocarbon group, a C 1 –C 20 halogen-containing hydrocarbon group, a silicon-containing group or a heteroatom-containing group with the proviso that at least one of R 2 through R 7 is a group containing a heteroatom such as oxygen, halogen or silicon; and R 2 through R 7 may be the same or different, and adjacent groups of R 2 through R 7 may be bonded to each other to form a ring.

6. The propylene homopolymer according to claim 4 , wherein the transition metal compound represented by the general formula (II) is a transition metal compound represented by the general formula (III):

wherein, M, X, Y, A 1 , A 2 , q and r are the same as defined in the above general formula (I); at least one of R 8 and R 9 represents a group containing a heteroatom such as oxygen, halogen or silicon; and R 10 through R 17 are respectively a hydrogen atom, a C 1 –C 20 hydrocarbon group, or a group containing a heteroatom such as oxygen, halogen and silicon.

7. A propylene resin composition comprising the propylene homopolymer according to claim 1 and a nucleating agent.

8. A molded product produced by molding the propylene homopolymer according to claim 1 .

9. A molded product produced by molding the propylene resin composition according to claim 7 .

10. A propylene resin modifier comprising the propylene homopolymer according to claim 1 .