Developments in Polypropylene Block Copolymer

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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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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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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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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Laminated packaging material with improved barrier properties and adhesion between layers for food packaging. The laminate has a polyolefin resin layer, a vapor-deposited layer, and an inorganic layer. The vapor-deposited layer contains a composition with specific polypropylene types and modifications to prevent delamination and provide brilliance. The composition is 30-85% isotactic polypropylene, 70-15% propylene copolymer, and optional grafting monomer.

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A polypropylene-based resin composition for packaging films of heat-sterilized foods that provides excellent balance of properties like heat resistance, low temperature impact resistance, transparency, stickiness resistance, food hygiene, and drop breakage resistance. The composition contains a specific block copolymer made by sequentially polymerizing propylene and propylene-ethylene copolymers. The block copolymer has a microphase-separated structure with a propylene-based polymer component and a propylene-ethylene random copolymer component. The composition also has specific molecular weight, crystallinity, and composition ratios to achieve the desired property balance. The sequential polymerization steps and particle size control prevent agglomeration and stickiness issues.

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