Olefin-based polymers and uses thereof

A 4-methyl-1-pentene-based copolymer comprising

• 50 to 99.9% by weight of a constituent unit derived from 4-methyl-1-pentene, and 0.1 to 50% by weight of a constituent unit derived from at least one olefin selected from olefins having 2 to 20 carbon atoms except 4-methyl-1-pentene, and having the following properties:
• i) the diad isotacticity is 70% or greater;
• ii) the ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) as measured by gel permeation chromatography (GPC) is in the range of 1.0 to 3.5;
• and
• iii) the intrinsic viscosity [η] is 1.2 (dl/g) or greater.

An olefin-based polymer A comprising

• 90 to 100% by weight of a constituent unit derived from 4-methyl-1-pentene, and 0 to 10% by weight of a constituent unit derived from at least one olefin selected from olefins having 2 to 20 carbon atoms except 4-methyl-1-pentene, and having the following properties:
• i) the diad isotacticity is 70% or greater;
• ii) the melting point (Tm) measured by DSC is 225° C. or higher;
• iii) the ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) as measured by gel permeation chromatography (GPC) is in the range of 1.0 to 3.5;
• and
• iv) the proportion of the decane-soluble fraction is 1% by weight or less.

An olefin-based polymer B comprising

• 50 to 99% by weight of a constituent unit derived from 4-methyl-1-pentene, and 1 to 50% by weight of a constituent unit derived from at least one olefin selected from olefins having 2 to 20 carbon atoms except 4-methyl-1-pentene, and having the following properties:
• i) the diad isotacticity is 70% or greater;
• ii) the melting point (Tm) measured by DSC is below 220° C. or unrecognizable;
• iii) the ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) as measured by gel permeation chromatography (GPC) is in the range of 1.0 to 3.5;
• and
• iv) the intrinsic viscosity [η] is 1.5 (dl/g) or greater.

A 4-methyl-1-pentene homopolymer having the following properties:

• i) the diad isotacticity is 70% or greater;
• ii) the melting point (Tm) measured by DSC is 230° C. or higher;
• iii) the ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) as measured by gel permeation chromatography (GPC) is in the range of 1.0 to 3.5;
• and
• iv) the intrinsic viscosity [η] is 1.2 (dl/g) or greater.

A 4-methyl-1-pentene-based elastomer comprising

• 50 to 90% by weight of a constituent unit derived from 4-methyl-1-pentene, and 10 to 50% by weight of a constituent unit derived from at least one olefin selected from olefins having 2 to 20 carbon atoms except 4-methyl-1-pentene, and having the following properties:
• i) the diad isotacticity is 70% or greater;
• ii) the ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) as measured by gel permeation chromatography (GPC) is in the range of 1.0 to 3.5;
• and
• iii) the intrinsic viscosity [η] is 1.2 (dl/g) or greater.