The present invention relates to an olefin-based copolymer having novel crystalline properties and capable of providing a molded article with further improved strength and impact strength when compounded with other resins, and a method for preparing the same The olefin-based copolymer is an olefin-based copolymer comprising an ethylene repeating unit and an α-olefinic repeating unit The olefin-based copolymer comprises polymer fractions defined by three different peaks at a predetermined temperature when analyzed by cross-fractionation chromatography

Olefin-based copolymer and process for preparing same

The present invention relates to a copolymer satisfying the following conditions: (1) density (d) is 0.85-0.89 g/cc; (2) melt index (MI, 190°C, 2.16 kg load condition) is 15-100 g/10min; (3) the number of unsaturated functional groups (total V) per 1,000 carbon atoms is 0.8 or less; and (4) the total Vs of vinylene and vinyl per 1,000 carbon atoms as measured by nuclear magnetic spectrum analysis satisfies (a) vinylene/total V=0.1-0.7 and (b) vinylene/vinyl=0.8-1.6. According to the present invention, the olefin-based copolymer, as the contents and types of unsaturated functional groups therein are adjusted, exhibits high fluidity while showing improved properties in terms of hardness, flexural strength, tensile strength, and the like.

Olefin based copolymer and preparation method for the same

The present invention relates to an olefin-based copolymer which has novel crystalline properties, and enables production of molded articles with enhanced impact strength and mechanical properties in compounding with other resins. The olefin-based copolymer includes an ethylene repeating unit and an alpha-olefin-based repeating unit. When analyzed by a temperature rising elution fractionation method, the olefin-based copolymer shows a first fraction and a second sub-crystalline fraction at a predetermined temperature respectively. When each weight average molecular weight of the first fraction and the second sub-crystalline fraction are calculated, a certain ratio is satisfied.

Olefin based copolymer having controlled crstalline porpoerty and molecular weight distribution

The present invention provides a polypropylene-based composite material capable of exhibiting excellent strength properties and impact strength properties, particularly, markedly improved impact strength properties at a low temperature without using a separate additive by including (A) polypropylene, and (B) an olefin-based polymer which satisfies the conditions of the following (b1) to (b4): (b1) density (d): from 0.850 to 0.910 g/cc, (b2) melt index (MI, 190° C., 2.16 kg load conditions): from 0.1 g/10 min to 100 g/10 min, (b3) molecular weight distribution (MWD): from 1.5 to 3.0, and (b4) i) two peaks are shown in a temperature range of −20° C. to 120° C. when taking measurements of temperature rising elution fractionation, and ii) a relation of T(90)−T(50)≥60° C. is satisfied (where T(90) is a temperature at which 90 wt % of the olefin-based polymer is eluted, and T(50) is a temperature at which 50 wt % of the olefin-based polymer is eluted).

Polypropylene-based composite material

The present invention relates to a polypropylene-based resin composition which exhibits mechanical properties such as excellent strength and more improved impact strength, and a molded article comprising the same. The polypropylene-based resin composition comprises: a polypropylene-based resin; and an olefin-based copolymer, and shows two or more elution temperatures at a predetermined temperature range when analyzing the olefin-based copolymer by temperature rising elution fractionation (TREF).

Polypropylene-based resin composition

The present invention provides a polypropylene-based composite capable of exhibiting impact strength characteristics, particularly, significantly improved impact strength characteristics at low temperatures, together with excellent strength characteristics, even without using a separate additive, by comprising (A) polypropylene and (B) an olefin-based polymer satisfying the following requirements, (b1) to (b4): (b1) density (d): 0.850 g/cc to 0.910 g/cc; (b2) melting index (MI, 190°C, 2.16 kg load conditions): 0.1 g/10 min to 100 g/10 min; (b3) molecular weight distribution (MWD): 1.5 to 3.0; and (b4) i) having two peaks in a temperature range of -20°C to 120°C for the measurement of temperature rising elution fractionation and ii) T(90)-T(50)‰¥60°C (where, T(90) is the temperature at which 90 wt% of olefin-based polymer is eluted and T(50) is the temperature at which 50 wt% of olefin-based polymer is eluted).

Polypropylene-based composite

The present invention relates to an olefin-based elastomer including an olefin-based polymer which has different elution temperature 1 (Te1) and elution temperature 2 (Te2) in a temperature range of -20C to 130C during a temperature rising elution fractionation (TREF) process. The olefin-based elastomer has a density of 0.86-0.91 g/cc and a melting index (MI) of 0.1-50 g/10 min, and the tensile strength of the olefin-based elastomer is 20-400 kgf/cm^2 when measured under fracture conditions in accordance with ASTM D638. According to the present invention, the olefin-based elastomer includes an olefin-based polymer which has narrow molecular weight distribution and has two elution temperatures (Te1 and Te2) during a TREF process. Accordingly, the olefin-based elastomer can exhibit excellent tensile strength and tensile elongation. Therefore, the olefin-based elastomer can be used in various fields including packing materials, building materials, household goods, etc. such as materials for a car, a wire, a toy, a textile, a medical product etc.

Choe Ik Je

Papers

Polypropylene-based composite

Polypropylene-based composite material

Olefin-based elastomer