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 method for predicting the physical properties of polymers. More specifically, the present invention relates to a method for predicting long-term stability of polymers using a molecular weight distribution curve.

Method for predicting physical properties of polymer

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 a polyolefin having molecular weight distribution of 1.5 to 3.0, and a branch gradient number (BGN) value of -0.01 to -1. The polyolefin according to the present invention has a molecular weight distribution of 1.5 to 3.0, and a branch gradient number (BGN) value of -0.01 to -1, wherein the branch gradient number value is calculated by Equation 1, which is BGN = (content of high molecular weight side chain - content of low molecular weight side chain) / (content of low molecular weight side chain). According to the present invention, a polyolefin having excellent impact strength and mechanical physical properties can be provided.

Polyolefin having excellent properties

The present invention relates to a catalyst composition comprising a transition metal compound and a dialkylzinc compound, and a method for manufacturing a polymer using the same To manufacture an olefin-based polymer having high crystallinity, high density, and high molecular weight, the catalyst composition according to the present invention comprises a transition metal compound having a high comonomer incorporation effect and a dialkylzinc compound, so that a polymer exhibiting a high melt index (MI) due to chain transfer of the polymer can be manufactured

Park Sang Eun

Papers

Polypropylene-based composite

Polyolefin having excellent properties

Catalystic composition comprising transition metal compound and for preparing polymers using the same

Olefin based copolymer and preparation method for the same

Olefin based copolymer having controlled crstalline porpoerty and molecular weight distribution