Abstract: An impact modifier composition (IMC) is disclosed comprising (a) a polyolefin plastomer (POP), and (b) at least one block copolymer. The POP has a density of 0.870 to 0.920 g/cm3, a MFI of 0.5 to 30 g/10 minutes at 190° C./2.16 kg, a melt index ratio of 10 to 22, and a long chain branching (LCB) of <15 LCB/106 carbons. The at least one block copolymer is selected from (i) a first hydrogenated styrenic block copolymer (first HSBC), (ii) a second hydrogenated styrenic block copolymer (second HSBC), and (iii) at least one multi-arm block copolymer (MABC). Each first HSBC and second HSBC has a polystyrene content (PSC) of 3 to 20 wt. %, and 15 to 30 wt. %, respectively. The impact modifier composition can be used in polyolefin compositions to improve impact resistance and a balance of other mechanical properties.

Abstract: The present invention relates to a polyolefin-based composite resin composition having a low coefficient of linear thermal expansion, wherein the composition comprises a) 40 to 80 weight % of crystalline ethylene-propylene copolymer, b) 5 to 40 weight % of ethylene-alpha-olefin copolymer, c) 5 to 30 weight % of calcium-metasilicate based wollastonite, and d) 5 to 30 weight % of inorganic reinforcing agent based on the total composition amount. The polyolefin-based composite resin composition having a low coefficient of linear thermal expansion not only has excellent mechanical rigidity, impact resistance, heat resistance, injection moldability, product flatness, and dimensional stability, but also has a low shrinkage, a low coefficient of linear thermal expansion, and a low heat sag. Therefore, it can be used for the manufacture of automobile exterior components.

Abstract: The present invention relates to a polyolefin-based composite resin composition having a low coefficient of linear thermal expansion, wherein the composition comprises a) 40 to 80 weight % of crystalline ethylene-propylene copolymer, b) 5 to 40 weight % of ethylene-alpha-olefin copolymer, c) 5 to 30 weight % of calcium-metasilicate based wollastonite, and d) 5 to 30 weight % of inorganic reinforcing agent based on the total composition amount.