Polypropylene Block Copolymer for Packaging

Polypropylene composite resin with improved impact resistance for lightweight, thin-walled parts like automotive components. The composite has a specific blend of propylene-ethylene block copolymers, thermoplastic elastomers, inorganic filler, and nucleating agent. The blend balances rigidity and impact resistance better than traditional PP. The resin has a narrow range of propylene-ethylene block copolymers with specific melt indexes, flexural moduli, and impact strengths. It also contains thermoplastic elastomers, filler, and nucleating agent in targeted amounts. This composition enables thinner, lighter parts with improved impact resistance compared to conventional PP.

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A polypropylene resin composition with improved impact strength by blending a specific graft copolymer and block copolymer with the polypropylene resin. The graft copolymer contains a grafted vinyl monomer component with at least 30% aromatic vinyl compound. The block copolymer is made from a monomer component containing an aromatic vinyl compound. The aromatic vinyl groups in the graft copolymer and block copolymer improve compatibility with the polypropylene resin, resulting in better dispersion and impact strength when blended with the polypropylene.

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Multi-block copolymers with improved processability and low-temperature impact strength for thermoplastic resins like polypropylene. The copolymers have a unique microstructure with coexisting ordered and lamellar phases. The ordered phase has nanometer-scale domains with specific sizes and interdomain spacing. The copolymers contain blocks of polystyrene and polyolefins like propylene and alpha-olefins. The polystyrene blocks have styrene repeating units and the polyolefin blocks have ethylene and alpha-olefin repeating units. The copolymers are prepared using chain transfer agents like organozinc compounds. The microstructure provides high fluidity and low-temperature impact strength for resins like polypropylene when blended with them.

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Reusable bottle that can be frozen without cracking or damage, and has improved impact resistance when frozen. The bottle has a unique design with ribs extending along the longitudinal axis inside the container part. The ribs prevent cracking and leakage during freezing expansion. The bottle is made from a specific polymer composition with high PP content and styrene-ethylene-butylene-styrene (SEBS) additive. This material has better low-temperature impact resistance compared to regular PP.

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Polypropylene block copolymer resin with improved thermal adhesiveness, impact resistance, and reduced fish eyes in molded articles like containers and films. The copolymer consists of a propylene homopolymer matrix and an ethylene-propylene elastomeric copolymer. The elastomeric copolymer has 40-70% ethylene content and an intrinsic viscosity ratio of 1.4-2.1 between the homopolymer and copolymer. This copolymer composition allows better heat resistance, thermal bonding, and impact strength compared to conventional copolymers with lower ethylene content or viscosity ratios.

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Toughened impact copolymerized polypropylene resin with improved properties like melt flow rate and impact strength for applications like automotive parts, appliances, and packaging. The resin composition contains copolymerized polypropylene, a nucleating agent, and a performance improver. The performance improver is a combination of an epoxy resin and a peroxide. It enhances the melt flow rate and impact resistance of the copolymerized polypropylene compared to using just the copolymer. The epoxy resin is cured imidazole. The peroxide can be dicumyl peroxide or triethyl-3,6,9-trimethyl-1,4,7-triperoxynonane. The composition also has antioxidant and acid neutralizer. The copolymerized polypropylene is made by propy

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Polypropylene resin composition with improved cold resistance for containers that can be used in refrigerated storage and transportation without cracking. The composition contains a propylene/ethylene block copolymer (A) meeting specific requirements and an ethylene polymer (B). The copolymer (A) has a decane-insoluble portion with certain properties like MFR, insoluble/soluble ratio, ethylene content, and intrinsic viscosity. The ethylene polymer (B) has a narrow MFR range. Adding a controlled amount of (B) to (A) enhances the composition's rigidity and cold resistance compared to (A) alone.

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High melt strength low melt viscosity random copolymerized polypropylene composition for improved processability and applications of polypropylene. The composition is made by optimizing the product distribution from two gas phase reactors in a polypropylene production process. By adjusting the feeds and conditions of the reactors, it is possible to create polypropylene with high melt strength and low melt viscosity simultaneously. This is achieved by balancing the molecular weight distribution to have high molecular weight fractions for strength and low molecular weight fractions for processability. The composition can be used in blow molding, foaming, thermoforming, coating, etc. applications where polypropylene's limitations like low melt strength hinder its use.

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A heterophasic polypropylene composition with improved balance of stiffness and toughness compared to conventional impact polymers. The composition has a matrix polypropylene phase (component a) and a dispersed rubber phase (component b) with spherical particles smaller than 1 um. The composition can be prepared by multistage continuous polymerization or mechanical blending. The specific weight ratios of components a and b are 70-80% and 20-30%, respectively. This composition has high fluidity, stiffness, and toughness balance properties compared to conventional impact polymers.

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Thermoplastic resin composition for automotive parts that provides a balance of impact strength, elastic modulus, and flow properties. The composition contains polypropylene and a specific multi-block copolymer. The copolymer has a liquid-like ordering phase with a domain size of 15-22 nm and interdomain distance of 40-60 nm. It also has a lamellar phase with a domain size of 2-9 nm and interdomain distance of 10-50 nm. This unique phase behavior enables the composition to have improved mechanical properties and flow properties compared to traditional polypropylene.

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Low gloss, low stress whitening, and good impact resistance polypropylene composition for applications like home furnishings. The composition contains a blend of random copolymerized polypropylene, block copolymerized polypropylene, maleic acid grafted polypropylene, and homopolypropylene. The specific ratios of these components provide the desired properties. The composition can be prepared by mixing and extruding the components at temperatures around 200-230 °C. The blend has lower gloss, better stress whitening resistance, and higher impact strength compared to homopolypropylene or block copolymerized polypropylene alone.

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High-impact copolymerized polypropylene with good fluidity and rigidity, prepared using a modified Spheripol-II polypropylene process. The modification involves using high specific surface area catalysts with specific donor additives in the reactor to regulate copolymer composition and sequence. This allows achieving high rubber phase content without sticking issues. The copolymer has a polypropylene matrix with embedded long-sequence polyethylene segments, a rubber phase of ethylene-propylene copolymer with specific ethylene content, and wide molecular weight distribution. This provides high impact strength, melt flow, and modulus.

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Impact copolymerized polypropylene (hiPP) with improved toughness for soft materials like automotive bumper fascia. The hiPP has a specific composition with ethylene content of 5-30% in the rubber phase, rubber phase content of 25-60%, ethylene content in base material of 0-5%, and ethylene to propylene ratio of 0.5-1:1. The hiPP is prepared by gas phase polymerization with a specific catalyst and loading ratio. A polypropylene composition with the hiPP, antioxidant, acid absorber, and other processing aids is also provided. The hiPP and composition have improved toughness compared to conventional hiPP.

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A polypropylene-based sealant film for high retort packaging applications like retort pouches that provides easy tearability, good heat sealability, low-temperature impact resistance, blocking resistance, and appearance without powdering. The film contains a specific composition of polypropylene, ethylene/propylene block copolymer, low-density polyethylene, high-density polyethylene, and optionally other polymers. The composition has specific properties like tear strength, yield point stress, crystallinity, intrinsic viscosity, and ratios of the polymer components to achieve the desired film properties.

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A high-impact polypropylene resin composition and molded articles produced from it. The composition has a unique balance of rigidity and impact strength without adding fillers or additives. It contains 74-80% propylene homopolymer and 20-26% ethylene-propylene rubber, with the ethylene-propylene rubber having a low ethylene content (6.5-7.5%) compared to typical compositions. This optimized ratio of ethylene-propylene rubber allows improving impact strength while maintaining rigidity compared to conventional polypropylene.

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Reusable freezable bottle that can be filled with liquid, frozen, and thawed without cracking or breaking. The bottle has a body made of a specific polypropylene composition with 85-90% polypropylene random copolymer (PPRC) and 10-15% styrene-ethylene-butylene-styrene (SEBS) additive. This composite material has improved impact resistance and flexibility when frozen compared to pure polypropylene. The cap is also made of a similar polypropylene blend.

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A reusable freezable water bottle that can withstand freezing temperatures without cracking or breaking. The bottle has a body with ribs along its length and a cap. Both the body and cap have a specific polymer composition containing polypropylene and a thermoplastic elastomer like SEBS. This combination provides impact resistance and flexibility at low temperatures to prevent cracking when the bottle contents freeze.

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Polypropylene compositions with broad molecular weight distributions and high molecular weight tails to provide improved stiffness while maintaining toughness. The compositions are made by polymerizing propylene using specific catalyst systems and conditions. The first step involves polymerizing propylene to a low Mw distribution. Then, in a second step, more propylene is polymerized in the presence of the first polymer to get a higher Mw distribution with a tail of very high molecular weight chains. This results in polypropylenes with Mw/Mn ratios over 10 and Mz over 100,000 g/mol. The compositions have good melt strength and impact resistance.

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Polypropylene composition for foaming with improved mechanical properties. The composition contains a heterophasic propylene copolymer (HECO) and a propylene copolymer (CP) made with a single site catalyst. The HECO has a melt flow rate of 1-30 g/10min and a shrinkage of less than 2.0%. The CP is a random copolymer of propylene and a C4-C10 alpha-olefin comonomer. The composition has balance of mechanical properties and foamability for applications like injection molding and foaming.

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Thermoplastic resin composition for automotive parts that provides improved impact resistance and processability compared to conventional polypropylene composites. The composition contains polypropylene and a specific polyolefin-polystyrene-based multiblock copolymer. The copolymer has a complex viscosity range of 40,000 to 350,000 Pa·s at 160°C and 0.5 rad/s, and a composite viscosity range of 900 to 3,500 Pa·s at 160°C and 125 rad/s. The copolymer is prepared using specific catalysts and ligands. This composition enables better fluidity during injection molding while maintaining high strength and impact resistance.

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