Polypropylene Block Copolymer for Packaging

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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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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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-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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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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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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Polypropylene resin composition with excellent melt fluidity and impact resistance for injection molding applications. The composition contains an ethylene-propylene block copolymer resin with specific properties. The block copolymer has a propylene homopolymer matrix with dispersed ethylene-propylene rubber blocks. The rubber blocks have a certain intrinsic viscosity range and solvent extract content relative to ethylene content. This composition allows high melt index for easy molding without sacrificing impact strength. The resulting molded products have good impact resistance and processability.

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Polypropylene composition with improved clarity and impact resistance suitable for containers like refrigerator storage containers. The composition has a heterophasic structure with a first polypropylene random copolymer phase and a second phase of a propylene-alpha olefin copolymer. The first phase is the matrix with higher xylene solubles, while the second phase has higher alpha olefin content and larger particle size. The alpha olefin content of each phase can be controlled. The composition balances clarity and impact resistance by optimizing the polymer phases. The alpha olefin content of the second phase is increased to improve sub-zero impact resistance without sacrificing clarity.

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Impact copolymer compositions for injection molding, extrusion, blow molding, coating, and rotomolding applications. The compositions contain a polypropylene matrix and a rubber-like copolymer. The copolymer has a weight average molecular weight of 30-200 kg/mol, a notched Izod impact strength of 5-75 KJ/m2, and an MFR at 230°C of 10-75 g/10min. This copolymer provides high impact resistance while avoiding gels and tiger striping defects in molded parts. The polypropylene matrix has a MFR at 230°C of 10-75 g/10min. The compositions can be used for stretch films, shrink films, packaging, blow molded parts, injection molded parts,

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Transparent polypropylene copolymer composition with improved balance of properties like high transparency and impact resistance. The composition contains a base polypropylene random copolymer with low ethylene content (<4%) blended with a rubbery propylene ethylene copolymer with higher ethylene content (>10%). The combination of phases provides transparency from the base copolymer and impact resistance from the rubbery copolymer. The ethylene content and phase ratios are optimized for the balance of properties. The catalyst system used in polymerization is a Ziegler-Natta catalyst with electron donors and cocatalysts.

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High impact resistance transparent random block copolymers for use in molded and extruded articles that have low turbidity and good impact properties. The copolymers contain a crystalline propylene-ethylene copolymer (component A) with specific ethylene content and molecular weight, and a second propylene-ethylene copolymer (component B) containing higher ethylene content. The balance of ethylene contents in the copolymers and the sequential polymerization steps result in low turbidity levels due to smaller crystallite size and cocrystallization of the rubber chains with the matrix.

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A polypropylene-based resin composition with improved impact strength, especially at low temperatures, for applications like corrugated sheets. The composition contains two types of polypropylene-based block copolymers. The first copolymer has 6-8 wt% ethylene content, the second copolymer has 13-15 wt% ethylene content. The lower ethylene copolymer improves stiffness and the higher ethylene copolymer improves impact resistance. This balance provides good balance of rigidity and impact strength.

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Molded products containing a block copolymer of propylene and alpha-olefins that has improved balance between low-temperature impact resistance and rigidity. The block copolymer has a specific composition and properties: 1) a propylene homopolymer part and a propylene/alpha-olefin copolymer part, 2) a high fraction (60-88 wt%) of insoluble propylene homopolymer with a long average chain length (800,000-1,000,000), 3) a lower fraction (12-40 wt%) of soluble propylene/alpha-olefin copolymer with 20-60 mol% ethylene content, 4) high melt flow rate (0.1-20 g/10 min) and viscos

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Polypropylene block copolymer resin with improved impact strength at both room temperature and low temperatures. The resin has a propylene homopolymer matrix dispersed with an ethylene-propylene elastic copolymer. The ethylene-propylene copolymer has 30-50% ethylene and a particle size of 0.5-1.5 μm. The resin also has specific properties like an intrinsic viscosity ratio of 2.0-3.5 between the propylene and ethylene-propylene copolymers, a melt index of 0.5-30 g/10 min, and at least 25% ethylene-propylene copolymer content. The resin is made by copolymerizing propylene and ethylene in a gas phase reactor with

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Polypropylene resin composition with improved whitening resistance, transparency, and impact strength. The composition contains an ethylene-propylene block copolymer resin step-polymerized in a reactor. The block copolymer has two crystallization temperatures in the ranges of 110-130°C and 67-77°C. The block copolymer contains a propylene homopolymer matrix and an ethylene-propylene rubber copolymer. The ethylene content in the block copolymer is 4-10% and the ethylene-propylene rubber copolymer is 12-30% by weight. This composition provides a molded polypropylene product with reduced whitening, improved transparency, and better impact resistance compared to regular polypropylene.

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Thermoplastic elastomer composite polypropylene resin composition that provides high impact resistance and mechanical strength without using crosslinking agents. The composition consists of an ultra high impact propylene block copolymer, a polypropylene block copolymer, and an ethylene rubber component. The composition has a density of 0.880-0.900 g/cm3, impact strength above 93 Shore A at room and -40°C, and hardness of 93-95 Shore A. This thermoplastic elastomer composite polypropylene can be processed and recycled without crosslinking agents like rubber. The composition is suitable for injection molded articles like automotive parts and industrial materials.

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Polypropylene resin composition and molded articles made from it that have improved balance between rigidity and impact resistance, and reduced flow marking compared to conventional PP compositions. The composition contains 20-78 wt% of an ethylene-propylene block copolymer with a specific intrinsic viscosity ratio, 2-20 wt% of high density polyethylene, and 10-30 wt% of inorganic filler. The block copolymer is made by step polymerization of propylene and ethylene, with a ratio of xylene-soluble copolymer to propylene homopolymer viscosity of 5-10. This composition provides improved impact resistance and suppressed flow marks in injection molded parts compared to conventional PP blends.

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A thermoplastic elastomer composition with improved processability and flexibility. It contains a propylene-alpha olefin copolymer with wide crystallinity distribution and a styrenic block copolymer. The propylene-alpha olefin copolymer has substantially isotactic propylene sequences and a wide range of ethylene content. This wide ethylene content distribution leads to a wide crystallinity distribution in the copolymer. The combination of the propylene-alpha olefin copolymer with the styrenic block copolymer provides good processability and flexibility. The composition can be used in applications like automotive parts, footwear, and packaging.

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Extrusion molded material, like bottles, with improved optical properties and impact resistance by using a specific propylene copolymer. The material comprises at least 75 wt% of a propylene copolymer with a defined composition, melt flow rate, and ethylene sequence distribution. This copolymer improves the optical properties of extrusion-molded materials like bottles compared to regular propylene copolymers. The copolymer has a propylene content of 85-95 mol%, ethylene comonomer content of 45-69 mol%, and a specific sequence distribution of ethylene blocks. This copolymer also has a lower hexane extractable level compared to regular propylene copolymers.

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