Propylene copolymer composition

A polypropylene composition containing 3 to 50% by weight of the following propylene polymer (A), and 97 to 50% by weight of the following propylene random copolymer (B):

• propylene polymer (A):
• a propylene polymer having the following properties (a) to (c):
• (a) the propylene polymer is either a propylene homopolymer or a propylene polymer containing less than 0.5 mol % of ethylene or an .alpha.-olefin having a carbon number of 4 to 20 and having a number average molecular weight (Mn) of 10,000 to 300,000;
• (b) the propylene polymer has a molecular weight distribution (Mw/Mn) within the range of 1 to 2.8;
• and
• (c) the propylene polymer has a mean elution temperature (T.sub.50) ranging from 40.degree. to 100.degree. C., and an elution dispersion degree (.sigma. value) of 0.1 to not more than 9,
• propylene random copolymer (B):
• a propylene random copolymer comprising propylene, and ethylene and/or an .alpha.-olefin having a carbon number of 4 to 20, the propylene random copolymer having the following properties (d) and (e):
• (d) the propylene random copolymer has 90 to 99.5 mol % of structural units obtained from propylene, and 0.5 to 10 mol % of structural units obtained from ethylene and/or an .alpha.-olefin having a carbon number of 4 to 20;
• and
• has a number average molecular weight (Mn) of 10,000 to 200,000;
• (e) the propylene random copolymer has a molecular weight distribution (Mw/Mn) of 4 to 9.

A copolymer composition containing 1 to 70% by weight of the following propylene copolymer (A), and 99 to 30% by weight of the following propylene random copolymer (B):

• propylene random copolymer (A):
• a propylene random copolymer (A) comprising propylene, and ethylene and/or an .alpha.-olefin having a carbon number of 4 to 20, the propylene random copolymer (A) having the following properties (a) to (c):
• (a) the propylene random copolymer has 90 to 99.5 mol % of structural units obtained from propylene, and 0.5 to 10 mol % of structural units obtained from ethylene and/or an .alpha.-olefin having a carbon number of 4 to 20 and having a number average molecular weight (Mn) of 10,000 to 300,000;
• (b) the propylene random copolymer (A) has a molecular weight distribution (Mw/Mn) of within the range of 1 to 2.8;
• and
• (c) the propylene random copolymer (A) has a mean elution temperature (T.sub.50) ranging from 50.degree. to 90.degree. C., and an elution dispersion degree (.sigma. value) of not more than 10,
• propylene random copolymer (B):
• a propylene random copolymer (B) comprising propylene, and ethylene and/or an .alpha.-olefin having a carbon number of 4 to 20, the propylene random copolymer (B) having the following properties (d) and (e):
• (d) the propylene random copolymer has 90 to 99.5 mol % of structural units obtained from propylene, and 0.5 to 10 mol % of structural units obtained from ethylene and/or an .alpha.-olefin having a carbon number of 4 to 20;
• and has a number average molecular weight (Mn) of 10,000 to 200,000;
• and
• (e) the propylene random copolymer (B) has a molecular weight distribution (Mw/Mn) of 4 to 9.

A polypropylene composition containing 3 to 50% by weight of the following propylene copolymer (A), and 97 to 50% by weight of the following propylene random copolymer (B):

• propylene polymer (A):
• a propylene polymer having the following properties (a) to (c):
• (a) the propylene polymer is either a propylene homopolymer or a propylene polymer containing not more than 10 mol % of ethylene having a number average molecular weight (Mn) of 10,000 to 300,000;
• (b) the propylene polymer has a molecular weight distribution (Mw/Mn) within the range of 1 to 2.8;
• and
• (c) the propylene polymer has a mean elution temperature (T.sub.50) ranging from 50.degree. to 90.degree. C., and an elution dispersion degree (.sigma. value) of 0.1 to not more than 9,
• propylene random copolymer (B):
• a propylene random copolymer comprising of propylene and ethylene and having the following properties (d) and (e):
• (d) the propylene random copolymer has 90 to 99.5 mol % of structural units obtained from propylene, and 0.5 to 10 mol % of structural units obtained from ethylene and has a number average molecular weight (Mn) of 10,000 to 200,000;
• and
• (e) the propylene random copolymer has a molecular weight distribution (Mw/Mn) of 4 to 9.

A polypropylene composition containing 3 to 50% by weight of the following propylene polymer (A), and 97 to 50% by weight of the following propylene random copolymer (B):

• propylene polymer (A):
• a propylene polymer having the following properties (a) to (c):
• (a) the propylene polymer is either a propylene homopolymer or a propylene polymer containing not more than 0.5 mol % of ethylene and having a number average molecular weight (Mn) of 10,000 to 300,000;
• (b) the propylene polymer has a molecular weight distribution (Mw/Mn) within the range of 1 to 2.8;
• and
• (c) the propylene polymer has a mean elution temperature (T.sub.50) ranging from 50.degree. to 90.degree. C., and an elution dispersion degree (.sigma. value) of 0.1 to not more than 9,
• propylene random copolymer (B):
• a propylene random copolymer consisting of propylene and ethylene and having the following properties (d) and (e):
• (d) the propylene random copolymer has 90 to 99.5 mol % of structural units obtained from propylene, and 0.5 to 10 mol % of structural units obtained from ethylene and has a number average molecular weight (Mn) of 10,000 to 200,000;
• and
• (e) the propylene random copolymer has a molecular weight distribution (Mw/Mn) of 4 to 9.

A copolymer composition containing 3 to 50% by weight of the following propylene polymer (A), and 97 to 50% by weight of the following propylene random copolymer (B):

• propylene random copolymer (A):
• a propylene random copolymer (A) consisting of propylene and ethylene and having the following properties (a) to (c):
• (a) the propylene random copolymer has 90 to 99.5 mol % of structural units obtained from propylene, and 0.5 to 10 mol % of structural units obtained from ethylene and has a number average molecular weight (Mn) of 10,000 to 300,000;
• (b) the propylene random copolymer (A) has a molecular weight distribution (Mw/Mn) of within a range of 1 to 2.8;
• and
• (c) the propylene random copolymer (A) has a mean elution temperature (T.sub.50) ranging from 50.degree. to 90.degree. C., and an elution dispersion degree (.sigma. value) of 0.1 or more and not more than 9,
• propylene random copolymer (B):
• a propylene random copolymer (B) consisting of propylene and ethylene and having the following properties (d) and (e):
• (d) the propylene random copolymer (B) has 90 to 99.5 mol % of structural units obtained from propylene, and 0.5 to 10 mol % of structural units obtained from ethylene and has a number average molecular weight (Mn) of 10,000 to 200,000;
• and
• (e) the propylene random copolymer (B) has a molecular weight distribution (Mw/Mn) of 4 to 9.