Propylene polymer, copolymers and elastomer

A propylene copolymer having such properties that:

• (i) said copolymer contains ethylene units in an amount of not more than 50% by mol;
• (ii) a triad tacticity of propylene units chain consisting of head-to-tail bonds, as measured by .sup.13 C-NMR, is not less than 98.0%;
• (iii) a proportion of inversely inserted propylene units based on 2,1-insertion of a propylene monomer in all propylene insertions, as measured by .sup.13 C-NMR, is not more than 0.20%, and
• (iv) an intrinsic viscosity, as measured in decahydronaphthalene at 135.degree. C., is in the range of 0.1 to 20 dl/g.

A propylene copolymer having such properties that:

• (i) said copolymer contains propylene units in an amount of 95 to 99.5% by mol and ethylene units in an amount of 0.5 to 5% by mol;
• (ii) a triad tacticity of propylene units chain consisting of head-to-tail bonds, as measured by .sup.13 C-NMR, is not less than 95.0%;
• (iii) a proportion of inversely inserted propylene units based on 2,1-insertion of a propylene monomer in all propylene insertions, as measured by .sup.13 C-NMR, of 0.05 to 0.5%, and
• (iv) an intrinsic viscosity, as measured in decahydronaphthalene at 135.degree. C., is in the range of 0.1 to 12 dl/g.

A propylene elastomer having such properties that:

• (i) said elastomer contains propylene units in an amount of 50 to 95% by mol and ethylene units in an amount of 5 to 50% by mol;
• (ii) a triad tacticity of propylene units chain consisting of head-to-tail bonds, as measured by .sup.13 C-NMR, is not less than 90.0%;
• (iii) a proportion of inversely inserted propylene units based on 2,1-insertion of a propylene monomer in all propylene insertions, as measured by .sup.13 C-NMR, of 0.05 to 0.5%;
• and
• (iv) an intrinsic viscosity, as measured in decahydronaphthalene at 135.degree. C., is in the range of 0.1 to 12 dl/g.