Polypropylene resins

Polyethylene. Traditional melt spun methods have not utilized polyethylene as the base polymer because the physical properties obtained have been lower compared to those obtained with polypropylene. Advances in polyethylene technology may result in the commercialization of new spunbonded stmctures having characteristics not attainable with polypropylene. Although fiber-grade polyethylene resin was announced in late 1986 (11,12), it has seen limited acceptance because of higher costs and continuing improvements in polypropylene resin technology (see Olefin POLYMERS, POLYETHYLENE). 

Tzoganakis, C., Vlachopoulos, J., and Hamielec, A.E., Production of Controlled-Rheol-ogy Polypropylene Resins hy Peroxide Promoted Degradation During Extrusion, Polym. Eng. Set, 28, 170 (1988)... 

Patent Number US 6166096 A1 20001226 PRE-EXPANDED PARTICLES OF POLYPROPYLENE RESIN, PROCESS FOR PRODUCING THE SAME AND PROCESS FOR PRODUCING IN-MOULD FOAMED ARTICLES THEREFROM... 

Patent Number EP 1075933 A2 20010214 MULTI-LAYER EXPANSION-MOLDED ARTICLE OF POLYPROPYLENE RESIN, PRODUCTION PROCESS THEREOF, AND CONTAINER, SHOCK-ABSORBING MATERIAL FOR AUTOMOBILE AND AUTOMOTIVE MEMBER FORMED OF THE MULTI-LAYER EXPANSION-MOLDED ARTICLE OF POLYPROPYLENE RESIN Kogure N Gokuraku H JSPCorp. 

Patent Number US 6077878 A1 20000620 FOAM MADE FROM MODIFIED POLYPROPYLENE RESIN AND PROCESS FOR THE PRODUCTION THEREOF... 

Patent Number US 6077875 A1 20000620 FOAMED AND EXPANDED BEADS OF POLYPROPYLENE RESIN FOR MOLDING... 

Patent Number EP 1016690 A2 20000705 WATER-CONTAINING POLYPROPYLENE RESIN COMPOSITION AND PRE-EXPANDED PARTICLES MADE THEREOF... 

Patent Number US 5902858 A 19990511 MODIFIED POLYPROPYLENE RESIN, FOAM MADE THEREOF AND PROCESSES FOR THE PREPARATION OF THEM... 

Patent Number EP 823443 A2 19980211 FOAMED PARTICLES OF MODIFIED POLYPROPYLENE RESIN AND METHOD OF PREPARING SAME... 

Patent Number US 5616627 A 19970401 POLYPROPYLENE RESIN COMPOSITION, POLYPROPYLENE RESIN FOAMED MATERIAL AND PROCESS FOR PRODUCING THE SAME... 

P-methoxypropionitrile (Fajen, 1985a), furfural and aqueous cuprous ammonium acetate (United States Occupational Safety and Health Administration, 1990b). Stabilizers are commonly used to prevent formation of peroxides in air and polymerization. No information was available on these other exposures, or on exposures to chemicals other than butadiene that are produced in some facilities, such as butylenes, ethylene, propylene, polyethylene and polypropylene resins, methyl-tert-butyl ether and aromatic hydrocarbons (Fajen, 1985b,c). 

C. Tzoganakis, J. Vlachopoulos, and A. E. Hamielec, Production of Controlled-rheology Polypropylene Resins by Peroxide Promoted Degradation during Extrusion, Polym. Eng. Sci., 28, 170-180 (1988). 

Natural cork is the closure preferred by most producers of medium- to high-priced sparkling wine. The dimensions of corks are 31 mm in diameter and 48 mm in height. The upper part of the cork is composed of cork particles, 2-6 mm in size, bonded together with a polypropylene resin. There are two or three whole cork disks, 6 mm thick, bonded to the bottom of the... 

Ultraviolet absorbers are added to polypropylene resins which are used where exposure to sunlight is high. These chemicals are essentially ineffective as heat or processing stabilizers. 

The polymeric phenolic phosphites are excellent heat and processing stabilizers and can contribute significantly to photostability. These broad-spectrum stabilizers offer possibilities for simplifying polypropylene stabilizer systems. They may allow one to use lesser amounts of other additives, and they open up a new area for potential cost savings in formulating polypropylene resins. 

Polypropylene Resin Injection Molding Fiber Extrusion Sheet Forming Thermoforming... 

Pinnacle Polymers is an independent producer of polypropylene resin for the fibers, molding, extrusion and compounding industries. The company works with its clients to engineer and develop optimum polymers for their process needs. Pinnacle s three main business segments are... 

The process has been demonstrated on a pilot scale by Lurgi and Statoil. Sufficient propylene has been produced to make polypropylene resin product by Borealis. This process appears to use an oxide doped ZSM-5 zeolite catalyst in fixed bed reactors. The oxide doping promotes the methanol conversion to olefins. All olefins, other than propylene, are recycled to extinction or purged as fuel gas or produced as naphtha. The flow sheet is illustrated in the Figure 11.8. 

Because reactive types of flame retardants are polymer-specific, their application is limited. There are several reactive flame retardants, specifically produced and all different in composition. For example, there is a 25% pelletized concentrate of antimony pentoxide, bromine and polypropylene resin of various melt flow indices, which is geared to PP fibers for textiles and carpets,... 

Petrothene [Quantum]. TM for polypropylene resins for blown, cast, and water-quenched films, substrate coating, wire and cable coating, injection molding, blow molding, thermoforming, pipe extrusion, calendering. 

Polypropylene resins Polyetyrene resins Polyurethane resins Polyvinyl chloride resins Polyvinyl halide resins... 

As a result of this the manufacturers of polymers have found it necessary to exercise leadership in pioneering the methods by which their polymers are formed—sometimes to the extent that the manufacturer has himself often sold the polymer in the fabricated form. Hercules, for example, pioneered in the manufacture and sale of polypropylene resin. We soon realized, however, that the conversion of this resin to fiber and to film and to foam, would have to be done by us because of the complex technologies and large investments involved. Consequently, the resin manufacturer now finds himself selling polypropylene fiber, biaxially-oriented film, and foam—successfully too if I may be allowed to add. 

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