Olefin block copolymer and preparation method thereof
AssigneeLG Chem, Ltd.
InventorsKyung-Seop Noh, Nan-Young Lee, Won-Hee Kim, Sang-Eun An, Sang-Jin Jeon, Cheon-Il Park, Choong-Hoon Lee
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Abstract
The present description relates to an olefin block copolymer having excellences in elasticity and heat resistance and its preparation method. 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. The olefin block copolymer has a density of 0.85 to 0.92 g/cm3, and density X (g/cm3) and TMA (Thermal Mechanical Analysis) value Y (° C.) satisfy a defined relationship.
Claims10
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 the olefin block copolymer has a density of 0.85 to 0.92 g/cm3, and density X (g/cm3) and TMA (Thermal Mechanical Analysis) value Y (° C.) satisfy the following Mathematical Formula 1:
- Y≧1378.8X−1115, [Mathematical Formula 1]
- wherein the olefin block copolymer has a melt index of 0.7 to 4.0 g/10min under a load of 2.16 kg at 190 ° C. and a Shore hardness of 60 to 90, and
- wherein the olefin block copolymer has a permanent recovery (after 300% elongation) of 20% to 60%.
Dependencies are inferred from the claim text.