Patents with Abstracts
Heterophasic polypropylene with high impact properties
Well known polypropylenes of commerce are particularly isotactic, semi-crystalline, thermoplastic polymer materials with an excellent cost- to performance ratio. However, their brittleness under high speed and especially low temperature impact loading limits its utilisation as engineering thermoplastic. A well known approach for improving the toughness of an isotactic polypropylene is the incorporation of ethylene-propylene copolymer as dispersed phase into the polypropylene matrix. Fracture characteristics and deformation behaviour of heterophasic ethylene-propylene copolymers is a function of the dispersed phase composition. It is object of the present invention to overcome the above disadvantages and to provide a polypropylene composition that shows excellent impact properties especially at low temperatures.
Nenseth and Doshev of Borealis Technology Oy, Finland, found that if a polypropylene homo- or copolymer with a low intrinsic viscosity as a matrix phase is combined with a dispersed phase comprising an ethylene-propylene copolymer with a high amount of ethylene monomer units and a high intrinsic viscosity. The resulting heterophasic propylene resin shows excellent impact properties especially at low temperatures. The heterophasic polypropylene resin according to this invention is produced preferably in a multi-stage process in a multi-stage reaction sequence. Thereby it is preferred that the propylene homo- or copolymer matrix (A) is produced in the bulk reactor and afterwards transferred to the gas phase reactor in which the ethylene-propylene rubber phase (B) is produced in the presence of component
Polypropylene for injection molding
The present invention relates to a polypropylene polymer endowed with some features especially suitable for injection molding application especially for the replacement of polystyrene resins. Polypropylene has been used for several years for casting cups and molds. However there is still a need for a polypropylene resin having a balancement of improved properties. In particular when the polypropylene resin is endowed with a high stiffness, high brittleness, narrow molecular weight distribution, high transparency and good flowability it is fit for the replacement of polystyrene in injection molding application such as the production of cups or other similar objects like plastic cutlery. In particular brittleness is important for this kind of application, where the cups at the end have to be destroyed and the broken fragments of these cups are less dangerous for getting hurt by the sharp fragments.
Fuchs and Schuetz of Basell Polyolefine GmbH, Germany, developed a polypropylene resin with a) melt flow rate (MFR) 140 to 180/g /10 min. b) distribution of molecular weight Mw/Mn lower than 2.6; c) haze (ASTM D 1003) (1 mm placque) between 9% and 17%; d) flexural modulus (ISO 178) after 48 h between 1850 and 2100 N/mm2 and e) notched IZOD Iso 180 1A) at 23 C. after 48 h between 3 and 2 kJ/m2. (RDC 4/8/2013)
Polypropylene composition for buried structures
Dougfas of Braskem America, Inc., developed a polypropylene resin for buried structures such as corrugated, non-pressure pipe. This impact copolymer shows superior processability, stiffness-impact balance, and superior long-term creep properties. This material consist of 83 to 95 wt% of a xylene polypropylene insoluble fraction and a polydispersity index of 2.5 to 6. This materials also contains 5 to 17 wt% weight percent of a xylene soluble fraction copolymer of propylene and ethylene. This soluble fraction can have 20 to 55 wt% weight percent ethylene. This material has a 50-year creep strain of less than about 8% at 1000 psi at 23.C. without creep rupture. (RDC 3/29/2012)
Process for producing molded propylene polymer product containing fibrous inorganic filler
Takeuchi, Yamamoto and Kishimoto of Honda Motor Co., Ltd and Ube Material Industries, Ltd. Developed polypropylene materials with improved in flexural properties and/or impact resistance by blending fibrous inorganic filler-containing pellets with a propylene polymer-containing matrix resin composition, in which the pellets consist of 35-80 wt% of a fibrous inorganic filler, 1-45 wt% of an olefin polymer, 5-45 wt% of an elastomer, and 0.3-10.0 wt% of a specific lubricant; kneading the blended product under molten condition; and molding the kneaded product. (RDC 3/7/2013)
beta.-nucleated polypropylene composition
Machl et al of Borealis Technology Oy, Finland, developed a polypropylene material consisting of a propylene homopolymer (A) and a random propylene-butene copolymer (B) or a random propylene-ethylene copolymer (B'). This material is .beta.-nucleated. Beta nucleating agent include diamides, quinacridones, calcium salts. This material is developed for improved stiffness and impact resistance for pipe and cable applications. (RDC 12/22/2012)
Polyolefin compositions having improved optical and mechanical properties
Fiebig et al of Borealis Technology Oy, Finland, developed a polyolefin consisting of (A) a first propylene-ethylene random copolymer and (B) a second propylene-ethylene random copolymer, wherein the polyolefin composition has an ethylene content CM AB of 1-10 wt % and an MFR(AB) of 3-20 g/10 min with the proviso that CMAB>CM A and MFR(A)/MFR(AB)>1.45 and where the polyolefin composition further has a randomness R of the ethylene distribution in the polymer chain of .gtoreq.0.945. Articles made from the novel polyolefin compositions have excellent optical properties even after subjecting them to a heat sterilization step. (RDC 11/8/2012)
Propylene-based polymer, propylene-based polymer composition, pellet and pressure-sensitive adhesive
Akai et al of Mitsui Chemicals, Inc., Japan, developed propylene-based materials for pressure-sensitive adhesives to various adherends, which show a desired initial adhesion and will not contaminate the adherends and which have excellent pellet handling properties. The propylene-based polymer (A) includes 65 to 80 mol % of a structural unit derived from propylene, 5 to 10 mol % of a structural unit derived from ethylene and 15 to 25 mol % of a structural unit derived from a C4-20 .alpha.-olefin (wherein these percentages are calculated based on 100 mol % of the total of the structural unit derived from propylene, the structural unit derived from ethylene and the structural unit derived from a C4-20 .alpha.-olefin) and has a heat of crystal fusion of 5 to 45 (J/g) as measured by DSC. (RDC 11/1/2012)
Polyolefin resin composition
Urushihara et al of Adeka Corporation, Japan, developed a polypropylene material containing a crystal nucleating agent resulting in a superior transparency. The polyolefin-based resin composition is characterized by comprising, with respect to 100 parts by mass of a polyolefin-based resin, 0.01 to 1 parts by mass of at least one crystal, carbamate nucleating agent. (RDC 11/1/2012)
Ultraviolet (UV) radiation stability and service life of woven films of polypropylene (PP) tapes for the production of jumbo bags
Basfar et al of Saudi Arabian Oil Company, Saudi Arabia, developed a polypropylene resin that includes a low molecular weight hindered amine light stabilizer, a high molecular weight hindered amine light stabilizer, a first antioxidant, and a second antioxidant for woven jumbo polypropylene bags. (RDC 8/29/2012)
Hino, Takahata and Yada of Sumitomo Chemical Company, Japan, developed a polyolefin optical film containing 8 to 30 wt % A and 92 to 70 wt % B. A is an amorphous polyolefin and Bis a propylene based polymer with which a crystal fusion peak having a crystal fusion heat larger than 30 J/g from -50 to 200 C. (RDC 7/30/2012)
Polypropylene composition for buried structures
Doufas of Braskem America, Pennsylvania, developed an polypropylene impact copolymer having superior processability, stiffness-impact balance, and superior long-term creep properties for the solid polymer useful for buried pipes. This polypropylene consists of 83 to 95 wt% xylene insoluble PP fraction and a polydispersity index of 2.5 to 6. This material further includes 5 to 17 wt% xylene soluble fraction of a copolymer of propylene and ethylene. The xylene soluble fraction can have about 20 to about 55 weight percent ethylene. The composition can have about 1.3 to about 19 weight percent total ethylene, a polydispersity index of from about 2.5 to about 4.5, and a 50-year creep strain of less than about 8% at 1000 psi at 23C without creep rupture. (RDC 7/27/2012)
Moldability modifier and polypropylene resin composition using the same
Zanka et al of Japan Polypropylene Corporation, Japan, developed a processing aid for polypropylene consisting of a propylene block copolymer (A) containing from 80 to 98 wt% of a propylene homopolymer portion (A1) and from 2 to 20 wt % of a propylene/ethylene random copolymer portion (A2), wherein the MFR of (A1) is 300 g/10 min or more, the ethylene content of (A2) is from 10 to 70 wt %, the [ζ.] of (A2) is 6.5 dl/g or more, and the MFR as a whole is 40 g/10 min or more; and propylene block copolymer (B) containing from 20 to 79 wt % of a propylene polymer portion (B1) and from 21 to 80 wt % of a propylene/ethylene random copolymer portion (B2), wherein the MFR of (B1) is 20 g/10 min or more, the ethylene content of (B2) is from 20 to 70 wt %, the [ζ.] of (B2) is from 2.5 to 9.0 dl/g, and the MFR as a whole is from 0.1 to 50 g/10 min; and a polypropylene resin composition using the same. (RDC 7/10/2012)
Eco-friendly polypropylene-polylactic acid composite composition
Hong and Han of Hyundai Motor Company, South Korea, developed a polypropylene-polylactic acid composite consisting of a mixture of polypropylene resin and polylactic acid resin with ethylene-octene copolymer grafted by anhydrous maleic acid and polylactic acid resin grafted by anhydrous maleic acid. Polyethylene-glycidyl methacrylate resin and talc particles are added thereto. The composition reduces CO2 emission and improve mechanical strength and heat resistance, thereby being suitable as a material for the interior and exterior parts of a vehicle as well as construction (RDC 7/10/2012)
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Roger D. Corneliussen
Maro Polymer Links
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Copyright 2012 by Roger D. Corneliussen.
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** Date of latest addition; date of first entry is 7/10/2012.