PROPYLENE POLYMER

NR, natural mbber CR, chloroprene SRs, synthetic mbbers IR, natural isoprene SBR, styrene—butadiene mbber BR, butadiene EPDM, ethylene—propjiene-diene EPM, ethylene—propylene polymer HR, isobutylene—isoprene NBR, nitrile—butadiene. [Pg.368]

Cables are available in a variety of constmctions and materials, in order to meet the requirements of industry specifications and the physical environment. For indoor usage, such as for Local Area Networks (LAN), the codes require that the cables should pass very strict fire and smoke release specifications. In these cases, highly dame retardant and low smoke materials are used, based on halogenated polymers such as duorinated ethylene—propylene polymers (like PTFE or FEP) or poly(vinyl chloride) (PVC). Eor outdoor usage, where fire retardancy is not an issue, polyethylene can be used at a lower cost. [Pg.323]

A typical process scheme for the direct hydration of propylene is shown ia Figure 2. Turnkey plants based on this technology are available (71,81). The principal difference between the direct and iadirect processes is the much higher pressures needed to react propylene direcdy with water. Products and by-products are also similar, and refining systems are essentially the same. Under some conditions, the high pressures of the direct process can increase the production of propylene polymers. [Pg.109]

There are five North American manufacturers of EPDM Unhoyal Chemical, Exxon, DuPont, DSM, and Bayer. In addition. Union Carbide and Dow are manufacturing the new gas-phase polymers. A new joint agreement between Dow and DuPont will offer these two companies some competitive advantages in this market. Trade names of commercial ethylene—propylene polymers include Bayer s Epsyn, Exxon s Vistalon, DuPont s Nordel, and Unhoyal s Royalene. [Pg.232]

In the propylene polymer the pendent methyl group is attached to an asymmetric carbon atom. [Pg.203]

Two random copolymers of this type are of importance, ethylene-propylene copolymers and ethylene-but-l-ene copolymers. The use and properties of polypropylene containing a small quantity of ethylene in stereoblocks within the molecule has already been discussed. Although referred to commercially as ethylene-propylene copolymers these materials are essentially slightly modified polypropylene. The random ethylene-propylene polymers are rubbery and are discussed further in Section 11.9. [Pg.275]

The Tg of P-plastomers changes as a function of ethylene content. The Tg decreases with increasing ethylene content, primarily due to an increase in chain flexibility and loss of pendant methyl residues due to incorporation of ethylene units in the backbone. It is well known that PP has a Tg of 0°C, and polyethylene a Tg< —65°C. The addition of ethylene to a propylene polymer would therefore be expected to decrease the Tg, as is observed here. A secondary effect would be the reduction in the level of crystallinity associated with increasing ethylene content, which is expected to reduce the constraints placed upon the amorphous regions in proximity to the crystallites. Thus, an increase in ethylene content will result in a lower T as well as an increase in magnitude and a decrease in breadth of the glass transition. [Pg.185]

Atactic polymethacrylate esters, glass transition temperatures of, 16 273t Atactic polypropene, 16 104 20 524 Atactic polystyrene, 10 180, 182 Atactic propylene polymers, 17 704, 705 Atactic PSSA, 20 468 Atenolol, 5 102, 160... [Pg.76]

Ethylene-propylene (EP) copolymers (EPR), 23 371 24 716-717. See also Ethylene—propylene polymers blends of, 24 700... [Pg.335]

Ethylene-propylene polymer vulcanizates, properties of, 10 715-716 Ethylene-propylene (diene) rubber, 9 559-560... [Pg.336]

Gas-phase process, of ethylene-propylene polymer manufacture, 10 711 Gas-phase reactions flow mixing for, 14 613 pressure and, 14 623 Gas-phase reactor (GPR), 20 533 Gas-phase sedimentation, 18 142 Gas-phase synthesis, in silicon carbide manufacture and processing, 22 533 Gas pipeline systems, 12 366 Gas pretreatment, 13 841 Gas processing, in petroleum refining, 18 663... [Pg.393]

Hazard quotient (HQ), 25 238 Hazards. See also Fire hazards Radiation hazards Safety entries assessments of, 27 839, 846 of ethylene-propylene polymers, 10 716 of hydrogen peroxide, 14 61-63 oxygen-related, 17 760-761 penalties for, 73 155-156 recognition in industrial hygiene, 74 205-213... [Pg.421]

Isotactic polystyrenes (IPS), 10 180 23 365 Isotactic propylene polymers, 17 703, 704 Isotactic-syndiotactic stereoblock PP, 16 110... [Pg.498]

Ozone rate constants, 27 771 Ozone reactions activation of, 27 779 kinetics and mechanism of, 27 778-779 Ozone resistance, of ethylene-propylene polymers, 10 704, 717 Ozone synthesis, energy requirements for, 27 798... [Pg.667]

Polymers, 20 389-412. See also Ethylene-propylene polymers Filled polymers Higher olefin polymers Polymerization Polysaccharides Shape-memory polymers (SMPs) SiC>2 polymer Special polymers Sulfur-containing polymers Thermosetting reactive polymers Water-soluble polymers aging of, 20 167... [Pg.737]

Polypropionate synthesis, 20 138 Polypropylene (PP), 20 523-548 24 272. See also Olefin fibers Propylene polymer entries Spheripol technology Spherizone technology advanced material, 2 693 asbestos substitute, 3 314t, 315 can coatings, 26 39 catalyst systems for, 20 525-528 catalyst yield for, 20 531-532 coatings, 7 40 conducting, 7 525... [Pg.742]

Propylene polymer manufacture, catalysts and technologies of, 17 704 Propylene polymers, 17 700. See also Polypropylene history of, 17 704 properties of, 17 704-705 types of, 17 703-704 uses of, 17 705... [Pg.768]

Solution prepregging, 20 284-285 Solution processing, 14 80 Solution process, of ethylene-propylene polymer manufacture, 10 708-710 Solution properties of lignin, 15 13 of polyampholytes, 20 479 ofVDC copolymers, 25 703-706 Solution spectrophotometry, 9 232 Solution spinning... [Pg.868]

Synthetic rubber(s), 1 693, 21 761. See Ethylene-propylene polymers. See also Butyl rubber acetylene-derived sources, 1 228 synthesis of first butyl rubber after disruption of natural rubber supply in WW II, 4 433... [Pg.917]

As the acid and propylene slosh past each other, about 50% of the propylene reacts with the sulfuric acid to form the sulfate. The- reaction is exothermic, so the contents of the tower must be continually cooled to maintain a 70—80°F temperature. This minimizes by-products, particularly propylene polymers. Any higher olefins, usually C4 and C5, in the... [Pg.199]

In the bulk process, liquid propylene (polymer grade propylene here too) replaces the hydrocarbon diluent used in the slurry phase process. The PP is continuously withdrawn from the solution and any unreacted monomer is flashed off and recycled. The back end of the process, atactic PP removal and catalyst deactivation and removal, is the same as the slurry process. [Pg.347]

C. J. Carman Agreed. But as far as those ethylene-propylene polymers which have crystallinity and a Tg of around minus forty or fifty degrees, I expect they might be in a different class. Here there might be some advantage to swelling. [Pg.119]

Patent Number US 6040348 A1 20000321 COMPOSITION BASED ON PROPYLENE POLYMERS FOR EXPANDED GRANULES, PROCESS FOR OBTAINING IT AND ITS USE... [Pg.57]

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