A thermoplastic vulcanizate comprises an isotactic polypropylene matrix phase in which cross-linked rubber particles are dispersed, the rubber particles comprising an ethylene-propylene-diene terpolymer (EPDM) containing at least 40 wt % of ethylene-derived units. A propylene-ethylene-diene terpolymer (PEDM) containing at least 60 wt % propylene-derived units and less than or equal to 25 wt % of ethylene-derived units and having a heat of fusion (H.sub.f) of 2 to 10 J/g is added to compatibilize the propylene/EPDM blend.

The present invention provides a resin modifier (Y) containing: a block polymer (X) that has a block of a hydrophobic polymer (a) and a block of a hydrophilic polymer (b) as constitutional units, the block polymer (X) having an orientation index () obtained by the following formula of 1.5 to 15:

orientation index ()=()/() wherein () represents a weight ratio [(.sub.b)/(.sub.a)] between the hydrophilic polymer (b) and the hydrophobic polymer (a) in the block polymer (X), and () represents a weight ratio [(.sub.b)/(.sub.a)] between the hydrophilic polymer (b) and the hydrophobic polymer (a) determined by reflective infrared spectroscopy of the block polymer (X) heat-melted and pressed to a thickness of 500 m.

A thermoplastic vulcanizate composition, comprising a first phase bi-continuously intertwined with from about 10 wt % to 80 wt % of a second phase throughout the composition, and from about 0.1 wt % to about 10 wt % of a curative system, the first phase comprising polypropylene and the second phase comprising an at least partially cured elastomeric rubber composition, comprising from about 10 wt % to about 40 wt % ethylene, from about 5 wt % to about 10 wt % of a conjugated diene having from 4 to 12 carbon atoms, and from about 50 wt % to about 85 wt % of a C.sub.4-C.sub.8 alpha olefin, based on the total weight of the elastomeric rubber composition present. A process for making is also disclosed.

An impact copolymer composition comprising a continuous phase comprising polypropylene and from 10 wt % to 80 wt % of a dispersed phase, based on the total amount of the composition, comprising a copolymer of ethylene and a C.sub.4-C.sub.8 alpha-olefin, the dispersed phase having an average particle size of less than 500 nm. A process for making is also disclosed.

A composition contains a blend of a primary polymer and a secondary polymer, an additive and an adhesive. The secondary polymer is less crystalline than the primary polymer, and the additive increases the melt viscosity of the blend. The composition can be used in 3D printing to result in reduced warping of polymers during 3D printing, especially when using lower polymers, such as, HDPE and LLDPE.

This invention relates to a composition can include a propylene polymer and up to about 60 wt % of an ethylene-acrylate copolymer, based on a weight of the propylene polymer and the ethylene-acrylate copolymer. The composition can have a strain hardening ratio of greater than 1 to about 15, where the extensional viscosity is measured at a Hencky strain rate of 1 s.sup.1 and at a temperature of 190 C. The ethylene-acrylate copolymer can include units derived from ethylene and at least 5 mol % of units derived from a C.sub.1-C.sub.4 alkyl acrylate.

According to an embodiment of the present invention, there is provided a method of preparing a rubber composition, which includes (a) synthesizing a living polymer by solution polymerization of a monomer mixture including a conjugated diene-based monomer in the presence of a first catalyst; (b) reacting some ends of the living polymer with a coupling agent; (c) reacting the remaining ends of the living polymer with an organotin halide compound to prepare an end-modified conjugated diene-based polymer solution; and (d) adding a second catalyst and a conjugated diene-based monomer to the end-modified conjugated diene-based polymer solution to induce solution polymerization.

A polypropylene composition, a preparation method thereof, and a film or a sheet prepared from the polypropylene composition and use thereof. The composition includes 45 parts to 75 parts of a polypropylene, 10 parts to 35 parts of an elastomer, 5 parts to 20 parts of a polyethylene, 0.1 parts to 0.5 parts of an antioxidant, and 0.1 parts to 0.5 parts of a lubricant. A half peak width of a crystallization peak of the polypropylene is 5 C. to 10 C., and a peak temperature of the crystallization peak of the polypropylene is 105 C. to 115 C. The polypropylene composition has a good tenacity, especially a30 C. low-temperature impact performance. The film or the sheet prepared from the composition and applied to automotive interior parts, can enable the external accessories not only to be less likely to generate sharp fragments while being strongly impacted, but also to have a matte characteristic.

A propylene ethylene copolymer having: i) xylene soluble fraction at 25 C. ranging from 14 wt % to 27 wt %; ii) intrinsic viscosity of the fraction soluble in xylene at 25 C. ranging from 1.0 to 2.4 dl/g; iii) melt flow rate, MFR, ranging from 1.0 g/10 min to 50.0 g/10 min; iv) an ethylene derived units content ranging from 5.0 wt % to 12.0 wt %; v) the ethylene derived units content on the fraction insoluble in xylene at 25 C. ranging from 2.5 wt % to 6.0 wt %; vi) the ethylene derived units content on the fraction soluble in xylene at 25 C. ranging from 15.2. wt % to 30.2 wt %; and vii) C.sup.13 NMR sequences PEP measured on the fraction insoluble in xylene at 25 C. ranging from 3.5 mol % to 5.5 mol % and C.sup.13 NMR sequences PEP measured on the fraction soluble in xylene at 25 C. ranging from 11.0 mol % to 14.2 mol %.

The resin composition according to the present invention contains a polypropylene resin (a), a hydrogenated block copolymer (b), and a hydrogenated block copolymer (c), wherein: a mass ratio of a content of the hydrogenated block copolymer (b) to a content of the hydrogenated block copolymer (c), (b)/(c), is 90/10 to 10/90; a mass ratio of a content of the polypropylene resin (a) to a total content of the hydrogenated block copolymer (b) and the hydrogenated block copolymer (c), (a)/((b)+(c)), is 10/90 to 90/10; and specific polymer blocks (C), (B1), and (B2) differing in amount of vinyl bond before hydrogenation are contained at a specific ratio.