US 2003/0120003 A1 · Polymer and process for producing the same

Abstract

The present invention relates to a polymer having a melt tension (MT (g)) substantially the same as or lower than that of a conventional polymer which is substantially the same as the polymer in the recurring unit of the main skeleton, the molecular weight, the molecular weight distribution and the crystallinity, and having a flow activation energy (Ea (KJ/mol)) larger than a value obtained by adding 5 KJ/mol to the Ea value of the conventional polymer. A preferred example of the polymer is a branched polyolefin comprising 50 to 100% by mol of recurring units derived from ethylene and 0 to 50% by mol of recurring units derived from an α-olefin of 3 to 20 carbon atoms and having the following properties: the flow activation energy (Ea (KJ/mol)) and the α-olefin content (C (% by weight)) satisfy a specific relation, and the melt tension (MT (g)) and the melt flow rate (MFR (g/10 min)) satisfy a specific relation. This branched polyolefin is excellent in moldability and mechanical strength.

Claims11

Dependent claims

A polymer having a melt tension (MT (g)) that is substantially the same as or lower than that of a conventional polymer which is substantially the same as the polymer in the recurring unit of the main skeleton, the molecular weight, the molecular weight distribution and the crystallinity, and having a flow activation energy (Ea (KJ/mol)) that is larger than a value obtained by adding 5 KJ/mol to the Ea value of the conventional polymer.

A branched polyolefin comprising 50 to 100% by mol of recurring units derived from ethylene and 0 to 50% by mol of recurring units derived from an α-olefin of 3 to 7 carbon atoms and having the following properties:

the flow activation energy (Ea (KJ/mol)) and the α-olefin content (C (% by weight)) satisfy the following relation:
in the case where the number of carbon atoms of the α-olefin is 3 and C≧10% by weight:
Ea≧0.130×C+28.7,
in the case where the number of carbon atoms of the α-olefin is 4 to 7 and C≧4.1% by weight:
Ea≧0.385×C+28.7,
in the case where the number of carbon atoms of the α-olefin is 3 and C<10% by weight (including the case where the α-olefin content is 0), and in the case where the number of carbon atoms of the α-olefin is 4 to 7 and C<4.1% by weight:
Ea≧30,
and
the melt tension (MT (g)) and the melt flow rate (MFR (g/10 min)) satisfy the following relation:
MT≦2.2×MFR−0.88.

7 more elements

A branched polyolefin comprising 50 to 100% by mol of recurring units derived from ethylene and 0 to 50% by mol of recurring units derived from an α-olefin of 8 to 20 carbon atoms and having the following properties:

the flow activation energy (Ea (KJ/mol)) and the α-olefin content (C (% by weight)) satisfy the following relation:
in the case of C≧4.1% by weight:
Ea≧0.385×C+28.7,
in the case of C<4.1% by weight:
Ea≧30,
and
the melt tension (MT (g)) and the melt flow rate (MFR (g/10 min)) satisfy the following relation:
MT≦2.2×MFR−0.88.

5 more elements

A branched polyolefin comprising:

(i) recurring units derived from at least one olefin selected from olefins of 2 to 20 carbon atoms, and
(ii) recurring units derived from a vinyl-terminated macromonomer comprising 50 to 100% by mol of recurring units derived from ethylene and 50 to 0% by mol of recurring units derived from an olefin of 4 to 20 carbon atoms, having a weight-average molecular weight of 600 to 200,000 and having less than 0.1 methyl branch, as measured by 13C-NMR, based on 1,000 carbon atoms.

Dependencies are inferred from the claim text.

Polymer and process for producing the same

Life of this patent

Polymer and process for producing the same

Life of this patent

Abstract

Claims11