Foam compositions comprise at least an ethylene/α-olefin interpolymer. The ethylene/α-olefin interpolymers of the present disclosure are multi-block copolymers comprising at least one soft block and at least one hard block. The foam compositions can further comprise a blowing agent and a cross-linking agent. Methods of making the foam compositions and foamed articles made from the foam compositions are also described.

The present disclosure provides a foam bead. The foam bead contains at least one of the following components: (A) a block composite; and/or (B) a crystalline block composite. The present disclosure also provides a sintered foam structure formed from a composition comprising at least one of the following components: (A) a block composite; and/or (B) a crystalline block composite.

A resin composition according to an aspect of the present invention comprises: an ethylene-vinyl alcohol copolymer (A); and a block copolymer (B) having a block (b1) that includes a vinyl aromatic monomer unit, and a block (b2) that includes an isobutylene unit, wherein the ethylene-vinyl alcohol copolymer (A) and the block copolymer (B) form a co-continuous phase structure; and a DSC curve obtained following heating the resin composition up to a melting point and cooling at a rate of 50° C./min in a differential scanning calorimetry analysis shows two peaks, with a higher peak top temperature falling within a range of 130° C. or greater and 170° C. or less, and a lower peak top temperature falling within a range of 100° C. or greater and less than 130° C. A resin composition may thus be obtained that is able to give a molded article that is superior in balance between gas barrier properties and flexibility.

A resin composition according to an aspect of the present invention comprises: an ethylene-vinyl alcohol copolymer (A); and a block copolymer (B) having a block (b1) that includes a vinyl aromatic monomer unit, and a block (b2) that includes an isobutylene unit, wherein the ethylene-vinyl alcohol copolymer (A) and the block copolymer (B) form a co-continuous phase structure; and a DSC curve obtained following heating the resin composition up to a melting point and cooling at a rate of 50° C./min in a differential scanning calorimetry analysis shows two peaks, with a higher peak top temperature falling within a range of 130° C. or greater and 170° C. or less, and a lower peak top temperature falling within a range of 100° C. or greater and less than 130° C. A resin composition may thus be obtained that is able to give a molded article that is superior in balance between gas barrier properties and flexibility.

A process for preparing a polyethylene composition comprising contacting ethylene with a first salan catalyst precursor and an activator to form branched vinyl/vinylidene-terminated high density polyethylene having a number average molecular weight (Mn) of at least 5,000 g/mole; and contacting the branched vinyl/vinylidene-terminated high density polyethylene with ethylene and a second metallocene catalyst precursor and an activator to form a comb-block HDPE. The polyethylene composition comprises a polyethylene backbone, and one or more branched high density polyethylene combs pendant to the backbone, the combs having an Mn of at least 5,000 g/mole, where the polyethylene has a branching index (g′) of less than 0.9.

A method for producing a propylene-based block copolymer produces a propylene-based copolymer that exhibits excellent stereoregularity, rigidity, and impact resistance in a convenient and efficient manner while achieving high polymerization activity. The method for producing a propylene-based block copolymer includes bringing a catalyst into contact with propylene, or propylene and an α-olefin, and bringing an electron donor compound into contact with the resulting product to produce a propylene-based block copolymer, the catalyst including a solid catalyst component that includes titanium, magnesium, a halogen, and an internal electron donor compound, a specific organoaluminum compound, and a specific external electron donor compound.

A polymer composition and a process for the production of this composition comprising a base resin is disclosed herein. The base resin includes a very high molecular weight component, a low molecular weight component, and a high molecular weight component having a weight average molecular weight higher than the weight average molecular weight of the low molecular weight component but lower than the weight average molecular weight of the very high molecular weight component. An amount of the very high molecular weight component in the base resin is 0.5 to 8 wt %. The very high molecular weight component has a viscosity average molecular weight of greater than 1100 kg/mol. The composition has FRR.sub.21/5 of equal to or greater than 38, a melt flow rate MFR.sub.21 of equal to or greater than 6.5 g/10 min and a viscosity at a shear stress of 747 Pa (eta747) of 450 to 3000 kPas.

The present invention relates to a solid catalyst for propylene polymerization and a method of producing a propylene polymer or copolymer using the solid catalyst for propylene polymerization, and provides a solid catalyst which prepares a dialkoxymagnesium carrier and is formed of a carrier produced through a reaction of the carrier with a metal halide, a titanium halide, an organic electron donor, etc., and a method of producing a propylene polymer or copolymer through copolymerization of propylene-alpha olefin using the solid catalyst, wherein the dialkoxymagnesium carrier has an uniform particle size range of 10 to 100 μm and a spherical particle shape by adjusting injection amounts, injection numbers, and reaction temperatures of metal magnesium, alcohol and a reaction initiator during a reaction process of metal magnesium and alcohol.

A solid catalyst component for polymerization of olefins is disclosed which can produce a polymer having low stickiness (tackiness) of polymer particles, excellent flowability, and favorable particle size distribution. The solid catalyst component for polymerization of olefins includes titanium, magnesium, a halogen atom and an internal electron donor, wherein the solid catalyst component has a multimodal pore volume distribution measured by a mercury intrusion method and has one or more peak tops in each of a pore radius range from 0.002 μm to 1 μm and a pore radius range from larger than 1 μm to 30 μm or smaller, and a ratio represented by pore volume V1 derived from pores in the radius range from 0.002 μm to 1 μm/pore volume V2 derived from pores in the radius range from larger than 1 μm to 30 μm or smaller is 0.30 to 0.65.

The present invention relates to the field of polymer materials. Disclosed are a random-syndiotactic block polybutadiene and preparation method thereof, the provided random-syndiotactic block polybutadiene having a structure of formula (I), and comprising a random polybutadiene structure and a syndiotactic 1, 2-polybutadiene structure, being useful as a compatibilizing agent to improve the compatibility of the syndiotactic 1, 2-polybutadiene/polybutadiene rubber blend. Experimental results show that, compared to a purely syndiotactic 1, 2-polybutadiene/polybutadiene rubber blend, the addition of the random-syndiotactic block polybutadiene thereto significantly improves the compatibility

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