Olefin block copolymer

Patent metadata

Field	Value
Publication number	US-9062146-B2
Application number	US-201213980870-A
Country	US
Kind code	B2
Filing date	Jan 20, 2012
Priority date	Jan 20, 2011
Publication date	Jun 23, 2015
Grant date	Jun 23, 2015

Abstract

The present description relates to an olefin block copolymer having excellences in elasticity, heat resistance, and processability. The olefin block copolymer includes a plurality of blocks or segments, each of which includes an ethylene or propylene repeating unit and an α-olefin repeating unit at different weight fractions. In the olefin block copolymer, a first derivative of the number Y of short-chain branches (SCBs) per 1,000 carbon atoms of each polymer chain contained in the block copolymer with respect to the molecular weight X of the polymer chains is a negative or positive number of −1.5×10 −4 or greater; and the first derivative is from −1.0×10 −4 to 1.0×10 −4 in the region corresponding to the median of the molecular weight X or above.

First claim

What is claimed is:

1. An olefin block copolymer comprising a plurality of blocks or segments, each comprising an ethylene or propylene repeating unit and an α-olefin repeating unit at different weight fractions,
wherein a first derivative of the number Y of short-chain branches (SCBs) per 1,000 carbon atoms of each polymer chain contained in the block copolymer with respect to the molecular weight X of the polymer chains is a negative or positive number of −1.5×10 −4 or greater; and the first derivative is from −1.0×10 −4 to 1.0×10 −4 in a region corresponding to the median of the molecular weight X or above.

2. The olefin block copolymer as claimed in claim 1 , wherein the first derivative is greater in a region below the median of the molecular weight X than in the region corresponding to the median of the molecular weight X or above.

3. The olefin block copolymer as claimed in claim 2 , wherein the first derivative decreases with an increase in the molecular weight X in the region below the median of the molecular weight X.

4. The olefin block copolymer as claimed in claim 2 , wherein the first derivative is from 2.0×10 −4 to 0.1 in a region where the molecular weight X is in the bottom less than 40%.

5. The olefin block copolymer as claimed in claim 1 , wherein the number Y of short-chain branches (SCBs) per 1,000 carbon atoms of the polymer chains is 70 or less.

6. The olefin block copolymer as claimed in claim 1 , wherein the number Y of short-chain branches (SCBs) per 1,000 carbon atoms of the polymer chains is from 20 to 70 in the region corresponding to the median of the molecular weight X or above,
wherein the deviation of the maximum and minimum values for Y in the region is 20 or less.

7. The olefin block copolymer as claimed in claim 1 , wherein the block copolymer comprises a hard segment comprising a first weight fraction of the α-olefin repeating unit and a soft segment comprising a second weight fraction of the α-olefin repeating unit,
wherein the second weight fraction is greater than the first weight fraction.

8. The olefin block copolymer as claimed in claim 7 , wherein the weight fraction of the α-olefin repeating unit contained in the entire block copolymer has a value between the first and second weight fractions.

9. The olefin block copolymer as claimed in claim 7 , wherein the content Y′ (wt. %) of the hard segment and the content X′ (wt. %) of the ethylene or propylene repeating unit in the block copolymer satisfy Mathematical Formula 1 as follows:
Y′ >2.8495 X′ −145.01  [Mathematical Formula 1].

10. The olefin block copolymer as claimed in claim 9 , wherein the olefin block copolymer comprises 50 to 90 wt. % of the ethylene or propylene repeating unit and a remaining content of the α-olefin repeating unit and satisfies the Mathematical Formula 1 in terms of the entire content range of the repeating units.

11. The olefin block copolymer as claimed in claim 7 , wherein the olefin block copolymer comprises 10 to 90 wt. % of the hard segment and a remaining content of the soft segment.

12. The olefin block copolymer as claimed in claim 7 , wherein the hard segment has a higher value than the soft segment in at least one property of the degree of crystallization, density, and melting temperature.

13. The olefin block copolymer as claimed in claim 1 , wherein the olefin block copolymer has a density of 0.85 to 0.92 g/cm 3 .

14. The olefin block copolymer as claimed in claim 1 , wherein the olefin block copolymer has a value of thermal mechanical analysis (TMA) of 70 to 140° C.

15. The olefin block copolymer as claimed in claim 1 , wherein the olefin block copolymer has a melt index of 0.5 to 5 g/10 min under a load of 2.16 kg at 190° C. and a Shore hardness of 50 to 100.

16. The olefin block copolymer as claimed in claim 1 , wherein the olefin block copolymer has a permanent recovery (after 300% elongation) of 110% or less.

17. The olefin block copolymer as claimed in claim 1 , wherein the olefin block copolymer has a melting temperature of 100 to 140° C.

18. The olefin block copolymer as claimed in claim 1 , wherein the olefin block copolymer has a weight average molecular weight of 50,000 to 200,000 and a molecular weight distribution of 2.0 to 4.5.

19. The olefin block copolymer as claimed in claim 1 , wherein the α-olefin repeating unit is a repeating unit derived from at least one α-olefin selected from the group consisting of 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1-undecene, 1-dodecene, 1-tetradecene, 1-hexadecene, and 1-itocene.

Assignees

• Noh Kyung-Seop
• Kim Won-Hee
• Lee Nan-Young
• Jeon Sang-Jin
• An Sang-Eun
• Lg Chemical Ltd

Inventors

• Noh Kyung-Seop
• Kim Won-Hee
• Lee Nan-Young
• Jeon Sang-Jin
• An Sang-Eun

Classifications

• C08F4/6592

  containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring · CPC title

• C08F210/16

  Copolymers of ethene with alpha-alkenes, e.g. EP rubbers · CPC title

• C08F301/00

  Macromolecular compounds not provided for in groups C08F10/00 - C08F299/00 · CPC title

• C08F2410/01

  Additive used together with the catalyst, excluding compounds containing Al or B · CPC title

• C08F4/65908

  in combination with an ionising compound other than alumoxane, e.g. (C6F5)4B-X+ · CPC title