Propylene random copolymer

The beads comprise an uncrosshnked propylene random copolymer having a melting point of at least 140C, as a base resin. The time required to attenuate an air pressure within the foamed beads applied by a pressurising treatment with air from 1.2 to 0.8 kgf/sq.cm.(G) under atmospheric pressure at 23C is at least 80 minutes and the CNl value of the foamed beads, which is defined by a given equation, is smaller than 3.80. 

The composition comprises, per 100 pbw, from 60 to 90 pbw of a propylene homopolymer (A) having a melt flow index from 0.1 to 20 g/10 min and from 40 to 10 pbw of a propylene random copolymer (B) containing from 3 to 20 mol % of ethylene and/or an alpha-olefin having from 4 to 6 carbon atoms, the melt flow index of which ranges from 25 to 3000 g/10 min. It is used in the manufacture of expanded granules and moulded cellular articles. 

EP ethylene-propulene amorphous copolymer blend RACO ethyl-ene-co-propylene random copolymer. 

Well-defined diblock (P—R) and triblock (P R — P) copolymers consisting of the polypropylene block (P) and the ethylene-propylene random copolymer block (R) were prepared by adding ethylene monomer during the living coordination polymerization of propylene with the soluble V(acac)3/Al(C2H5)2Cl/anisole catalyst U1). 

As illustrated in Fig. 24, the addition of ethylene during the living polymerization of propylene resulted in rapid increases in both yield and Mn of the polymers. After the rapid increases which required several minutes, yield and lVln increased by a slower rate, identical with that of the propylene homopolymerization. The propylene content in the resulting polymers attained a minimum value several minutes after the addition of ethylene. These results indicate that the second stage of the polymerization with ethylene was complete within several minutes to afford a diblock copolymer, followed by the third stage of propylene homopolymerization leading to the formation of a triblock copolymer. The 13C NMR spectra of the diblock copolymers showed that the second block was composed of an ethylene-propylene random copolymer sequence. 

Calculate the glass transition temperature, Tg for a noncrystalline ethylene-propylene random copolymer that contains 20 —CH3 groups per 100 main-chain carbons, knowing that it reduces the degree of crystallinity of the copolymer to 0%. 

As discussed earlier, ethylene propylene rubber (EPR or EPM) has been blended with PP and PE to improve the impact strength and to render the materials softer. Recently, metallocene catalysts or postmetallocene catalysts provide new pathways to generate elastic copolymers that can replace EPR. These pathways possess cheaper manufacturing cost and generate new materials with better compatibility to PP or PE. Such new materials included ethylene-propylene random copolymers with dominant ethylene component (33-34) or propylene-dominant component (35 1), propylene-ethylene block copolymer (42), ethylene-octene copolymer (43), poly(propylene-co-ethylene) (44), ethylene-hexene copolymer (45), ethylene-butene copolymer (46), low isotactic PP (47), and stereoblock PP (48). These materials are generally compatible with PP or PE, thus can be used to tailor the toughness (or the softness) of... 

Practically, some of the above polyolefin copolymers have already been used to blend with PP in applications such as car bumpers and impact elastomeric goods. Although ethylene-propylene random copolymer has been the main component for such... 

Ethylene or propylene random copolymers containing 10-undecen-l-ol, 5-hexen-l-ol, or 12-tridecen-2-ol were synthesized using bridged zirconocenes/MAO in toluene at 60—80 °C. The propylene copolymers contained 0.6—2.7 wt % of the comonomers incorpo-... 

A comparison [32] of standard (ASTM and DIN) Charpy notch-impact test results with those of critical strain energy release rates G... obtained in accordance with LEFM criteria under the condition of small-scale yielding, were made for various unfilled polypropylenes. blends of PP with ethylene-propylene random copolymer (EPR) and also with... 

Polyisobutylene (Butyl Rubber, Copolymer with 0.5-2% Isoprene) (HR) Chloro-Sulfonated Polyethylene (CSM) Ethylene-Propylene Random Copolymer, 50% Ethylene (EPM) Ethylene-Propylene Random Terpolymer 50% Ethylene (EPDM) Poly(Ethyl Acrylate), Usually a Copolymer (ACM) Vinylidene-Fluoride-Chlorotrifluoro Ethylene Random Copolymer (FKM) Vinylidene— Fluoride— Hexafluoropropylene Random Copolymer (FKM)... 

In this paper we report on the preparation of a functionalized ethylene-propylene random copolymer (EPM) and on the synthesis of EPM-g-PA 6 graft copolymers utilizing the functionalized EPM. Preliminary results on the use of modified EPM rubbers in PA 6/EPM blends have been previously reported . 

RCP = ethylene-propylene random copolymer with an ethylene content of about 3%. 

Passaglia, E., Corsi, L., AgUetto, M., Giardelli, F., Michelotti, M., and Suffredini, G. 2003a. One-step functionalization of an ethylene/propylene random copolymer with two different reactive groups. Journal of Applied Polymer Science 87 14-23. 

Ethylene-propylene random copolymer Plateau modulus and entanglement GPC, DSC, oscillatory rheometry 120... 

Composites prepared by filling with carbon black natural rubber/polyethylene or polystyrene/ethylene-propylene random copolymer blends have an electrical conductivity much higher than that for the individual components at the same loading level (Geuskens et al. 1987). The addition of carbon black to these immiscible polymers lowered the size of the dispersed phase. 

Wright, K.J., Lesser, A.J., Crystallinity and mechanical behavior evolution in ethylene-propylene random copolymers. Macromolecules 2001,34 3626-3633. 

As with the numerous groups who have applied fibre and film stacking techniques to produce self-reinforced polymer composites based on PE, the fibre and film stacking technique was also applied to PP-based systems, as reported by Kitayama et al. [59, 60]. The authors report the production of a unidirectional composite by consolidating PP multifilament yams between films of an ethylene-propylene random copolymer. This film was reported to have a broad melting behaviour with an endothermic melting peak at 130 °C, and so allowed for composite... 

Inaha, N., Yamada, T, Suzuki, S., and Hashimoto, T. (1988) Morphology control of binary polymer mixtures by spinodal decomposition and crystallization. 2. Further studies on polypropylene and ethylene-propylene random copolymer. Macromolecules, 21 (2), 407-414. 

In addition to living propylene polymerization, vanadium acetylacetonate complexes have also been shown to be living for 1,5-hexadiene polymerization and 1,5-hexadiene/ propylene copolymerization (Doi et al, 1989). At —78°C, l/Et2AlCl polymerized 1,5-hexadiene to produce a low molecular weight polymer (M = 6600 g/mol, M IM = 1.4) that contained a mixture of MCP and VTM units in a 54 46 ratio. The distribution of these two units varied in 1,5-hexadiene-propylene random copolymers as a function of 1,5-hexadiene incorporation. 

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