Developments in Random Copolymer Polypropylene

A sealant film for packaging applications that provides both excellent heat resistance and low temperature sealability while being a polypropylene-based film. The sealant film has a first layer containing specific ratios of propylene homopolymer, propylene-ethylene random copolymer, and a specific ethylene-olefin copolymer elastomer. This composition allows the film to withstand high temperatures for sterilization like retort treatment and also seal at lower temperatures for packaging applications.

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Multilayer polypropylene film for packaging applications that balances heat resistance, transparency, and anti-blocking properties. The film has an outer layer with specific proportions of propylene homopolymer and propylene-ethylene random copolymer, along with an anti-blocking agent. This outer layer provides good sealing and anti-blocking. The inner layer has a higher proportion of propylene-ethylene block copolymer and ethylene-propylene elastomer. This inner layer provides heat resistance. The film structure allows retort packaging of food items while maintaining visibility and avoiding blocking issues.

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Propylene-ethylene random copolymer compositions for hot fill packaging of food and beverages that provide good stiffness, heat resistance, and transparency. The copolymers have propylene as the primary monomer with 2-6 wt% ethylene, melt flow rates >1 g/10 min, and xylene solubles <7 wt%. They are produced using a Ziegler-Natta catalyst and alkoxysilane electron donor.

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Multilayer film for packaging applications that provides excellent heat resistance and transparency. The film has an outer layer containing a propylene homopolymer and a propylene/ethylene random copolymer with low ethylene content, sandwiched between an inner layer with a propylene/ethylene block copolymer and an elastomer. The outer layers have specific ratios of propylene and ethylene copolymers to balance heat resistance and transparency. The inner layer with the block copolymer and elastomer provides flexibility.

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A reusable bottle that can be frozen without cracking or breaking. The bottle has a body and cap made from a specific polymer composition. The body contains 85-90% polypropylene random copolymer (PPRC) and 10-15% thermoplastic elastomer (TPE) like SEBS. The cap has 85-90% polypropylene block copolymer (PPB) and 10-15% SEBS. This composition improves impact resistance and prevents cracking when the frozen bottle is handled. The TPE additive in the polypropylene matrix enhances ductility and flexibility at low temperatures.

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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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Reusable freezable water bottle with improved impact resistance and ability to withstand freezing temperatures without damage. The bottle has a body made of a polymer composition containing 85-90% polypropylene random copolymer (PPRC) and 10-15% thermoplastic elastomer (TPE) like SEBS. This composition provides impact resistance when frozen. The cap is made of 85-90% polypropylene block copolymer (PPB) and 10-15% SEBS. The composition ratio and specific polymer types are optimized to balance properties like impact resistance, flexibility, and processability.

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A liquid repellent layer composition for packaging materials that prevents adhesion of contents to the inner surface. The composition contains a polypropylene resin and a silylated polyolefin. The polypropylene resin has a specific composition with a mix of random and block polypropylene in a ratio of 20-80/80-20. This composition provides the right balance of crystallinity and melting point to enable segregation of silicon from the silylated polyolefin on the liquid repellent layer surface. This segregation improves liquid repellency compared to using just the polypropylene resin.

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Propylene-ethylene random copolymers for hot fill packaging applications that have improved stiffness, heat resistance, and transparency compared to existing copolymers. The copolymers have propylene as the primary monomer with 2-6% ethylene content, melt flow rates >1 g/10 min, xylene solubles <7%, and a xylene solubles/ethylene ratio <=1.5. They are produced using Ziegler-Natta catalysts and alkoxysilane electron donors.

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Bottle closure assembly with a tethered cap that stays attached to the bottle after removal. The closure is made from a specific polyethylene composition with certain properties for good processability, organoleptic properties, and dimensional stability. The composition includes two ethylene copolymers, one with low melt index and density and the other with higher melt index and density. The ratio of short chain branches per thousand carbon atoms in the copolymers exceeds 0.5. This allows good processing and tether flexibility while preventing cracking.

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Laminate film for packaging applications that provides antifogging properties without compromising sealing strength. The film has a heat sealing layer with specific resin composition containing a propylene-based polymer, copolymers like propylene/1-butene, ethylene/alpha-olefin, and 1-butene/alpha-olefin. The heat sealing layer surface has a wet tension of 32-45 mN/m. This combination of copolymers and wetting properties prevents fogging when sealing high water content foods without compromising seal strength.

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Peelable packaging film for items like crackers with reduced puncture risk compared to traditional polyethylene films. The film has a multilayer structure with a puncture-resistant polypropylene core layer containing a propylene-ethylene copolymer. An intermediate peelable layer with a peeling agent between the core and inner skin layer allows easy peeling. The propylene-ethylene copolymer in the core improves puncture resistance compared to plain polypropylene.

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Laminate structure for packaging materials that provides good delamination resistance, appearance, and gas barrier properties. The laminate has layers of polyolefin resin, a deposition layer, and an inorganic layer. The deposition layer composition contains grafted polypropylene with modified propylene-based copolymer. The grafting improves adhesion between the deposition layer and the polyolefin layer, preventing delamination. The modified copolymer provides glitter appearance in the inorganic layer.

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Extrusion blow molded articles, like bottles, with improved optical properties by using a specific propylene copolymer composition. The copolymer has a high comonomer content, moderate xylene soluble content, and a bimodal molecular weight distribution. This combination allows better visual appearance and clarity of the molded article compared to typical blow molded parts made from propylene copolymers. The copolymer composition can have a comonomer content of 2-7 wt% and an intrinsic viscosity of 1.3-3 dl/g. The copolymer matrix has a bimodal comonomer content distribution and molecular weight distribution.

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Propylene copolymer for thin-wall packaging with high flowability, impact strength, and clarity. The copolymer has a specific composition of propylene units and comonomer units. It can be made by slurry polymerization using a catalyst system with a magnesium compound and an internal donor. The copolymer has a propylene content of at least 95 wt%, a comonomer content of at least 5 mol%, and a melting flow rate (MFR2) of at least 35 g/10 min. The copolymer is useful in thin-wall packaging applications like containers, cups, and lids due to its good balance of properties like flowability, impact resistance, and optical clarity.

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Heat-sealable, peelable packaging film for puncture-prone products like crackers. The film has a core layer made of puncture-resistant biaxially oriented polypropylene (BOPP) containing a propylene-ethylene copolymer. An intermediate peelable layer with a peeling agent is sandwiched between the core and an interior skin layer. The core layer's puncture resistance is enhanced by adding an elastomeric propylene-ethylene copolymer to the core layer composition. This allows the film to be heat-sealed, peeled easily, and have improved puncture resistance compared to pure BOPP.

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Stretch packaging film for food applications that is chlorine-free and contains no plasticizers. The film has a layer structure with a core layer made of a specific propylene-ethylene copolymer and a crystalline polypropylene resin. The propylene-ethylene copolymer has 5-30% ethylene content and unique crystallization properties. The core layer composition and ratio to the crystalline polypropylene resin provides good film properties like stretch, transparency, and sealing while avoiding issues like blocking and film defects.

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